#include "win32windowcontext_p.h"
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#include "qwkcoreglobal_p.h"
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#include <optional>
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#include <QtCore/QHash>
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#include <QtCore/QAbstractNativeEventFilter>
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#include <QtCore/QScopeGuard>
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#include <QtGui/QGuiApplication>
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#include <QtCore/private/qsystemlibrary_p.h>
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#include <QtGui/private/qhighdpiscaling_p.h>
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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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# include <QtGui/private/qguiapplication_p.h>
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#endif
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#include <QtGui/qpa/qplatformwindow.h>
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#if QT_VERSION < QT_VERSION_CHECK(6, 2, 0)
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# include <QtGui/qpa/qplatformnativeinterface.h>
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#else
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# include <QtGui/qpa/qplatformwindow_p.h>
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#endif
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#include <shellscalingapi.h>
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#include <dwmapi.h>
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#include <timeapi.h>
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#include <versionhelpers.h>
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Q_DECLARE_METATYPE(QMargins)
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namespace QWK {
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// The thickness of an auto-hide taskbar in pixels.
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static constexpr const auto kAutoHideTaskBarThickness = quint8{2};
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// hWnd -> context
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using WndProcHash = QHash<HWND, Win32WindowContext *>;
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Q_GLOBAL_STATIC(WndProcHash, g_wndProcHash)
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// Original Qt window proc function
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static WNDPROC g_qtWindowProc = nullptr;
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// ### FIXME FIXME FIXME
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// ### FIXME: Tell the user to call in the documentation, instead of automatically
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// calling it directly.
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// ### FIXME FIXME FIXME
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static struct QWK_Hook {
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QWK_Hook() {
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qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
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}
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} g_hook{};
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struct DynamicApis {
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// template <typename T>
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// struct DefaultFunc;
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//
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// template <typename Return, typename... Args>
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// struct DefaultFunc<Return(QT_WIN_CALLBACK *)(Args...)> {
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// static Return STDAPICALLTYPE func(Args...) {
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// return Return{};
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// }
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// };
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//
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// #define DWM_API_DECLARE(NAME) decltype(&::NAME) p##NAME = DefaultFunc<decltype(&::NAME)>::func
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#define DWM_API_DECLARE(NAME) decltype(&::NAME) p##NAME = nullptr
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DWM_API_DECLARE(DwmFlush);
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DWM_API_DECLARE(DwmIsCompositionEnabled);
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DWM_API_DECLARE(DwmGetCompositionTimingInfo);
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DWM_API_DECLARE(GetDpiForWindow);
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DWM_API_DECLARE(GetSystemMetricsForDpi);
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DWM_API_DECLARE(GetDpiForMonitor);
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DWM_API_DECLARE(timeGetDevCaps);
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DWM_API_DECLARE(timeBeginPeriod);
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DWM_API_DECLARE(timeEndPeriod);
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#undef DWM_API_DECLARE
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DynamicApis() {
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QSystemLibrary user32(QStringLiteral("user32"));
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pGetDpiForWindow =
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reinterpret_cast<decltype(pGetDpiForWindow)>(user32.resolve("GetDpiForWindow"));
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pGetSystemMetricsForDpi = reinterpret_cast<decltype(pGetSystemMetricsForDpi)>(
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user32.resolve("GetSystemMetricsForDpi"));
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QSystemLibrary shcore(QStringLiteral("shcore"));
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pGetDpiForMonitor =
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reinterpret_cast<decltype(pGetDpiForMonitor)>(shcore.resolve("GetDpiForMonitor"));
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QSystemLibrary dwmapi(QStringLiteral("dwmapi"));
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pDwmFlush = reinterpret_cast<decltype(pDwmFlush)>(dwmapi.resolve("DwmFlush"));
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pDwmIsCompositionEnabled = reinterpret_cast<decltype(pDwmIsCompositionEnabled)>(
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dwmapi.resolve("DwmIsCompositionEnabled"));
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pDwmGetCompositionTimingInfo = reinterpret_cast<decltype(pDwmGetCompositionTimingInfo)>(
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dwmapi.resolve("DwmGetCompositionTimingInfo"));
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QSystemLibrary winmm(QStringLiteral("winmm"));
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ptimeGetDevCaps =
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reinterpret_cast<decltype(ptimeGetDevCaps)>(winmm.resolve("timeGetDevCaps"));
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ptimeBeginPeriod =
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reinterpret_cast<decltype(ptimeBeginPeriod)>(winmm.resolve("timeBeginPeriod"));
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ptimeEndPeriod =
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reinterpret_cast<decltype(ptimeEndPeriod)>(winmm.resolve("timeEndPeriod"));
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}
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~DynamicApis() = default;
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static const DynamicApis &instance() {
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static const DynamicApis inst{};
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return inst;
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}
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private:
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Q_DISABLE_COPY_MOVE(DynamicApis)
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};
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static inline constexpr bool operator==(const POINT &lhs, const POINT &rhs) noexcept {
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return ((lhs.x == rhs.x) && (lhs.y == rhs.y));
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}
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static inline constexpr bool operator!=(const POINT &lhs, const POINT &rhs) noexcept {
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return !operator==(lhs, rhs);
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}
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static inline constexpr bool operator==(const SIZE &lhs, const SIZE &rhs) noexcept {
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return ((lhs.cx == rhs.cx) && (lhs.cy == rhs.cy));
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}
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static inline constexpr bool operator!=(const SIZE &lhs, const SIZE &rhs) noexcept {
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return !operator==(lhs, rhs);
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}
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static inline constexpr bool operator>(const SIZE &lhs, const SIZE &rhs) noexcept {
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return ((lhs.cx * lhs.cy) > (rhs.cx * rhs.cy));
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}
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static inline constexpr bool operator>=(const SIZE &lhs, const SIZE &rhs) noexcept {
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return (operator>(lhs, rhs) || operator==(lhs, rhs));
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}
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static inline constexpr bool operator<(const SIZE &lhs, const SIZE &rhs) noexcept {
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return (operator!=(lhs, rhs) && !operator>(lhs, rhs));
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}
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static inline constexpr bool operator<=(const SIZE &lhs, const SIZE &rhs) noexcept {
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return (operator<(lhs, rhs) || operator==(lhs, rhs));
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}
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static inline constexpr bool operator==(const RECT &lhs, const RECT &rhs) noexcept {
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return ((lhs.left == rhs.left) && (lhs.top == rhs.top) && (lhs.right == rhs.right) &&
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(lhs.bottom == rhs.bottom));
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}
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static inline constexpr bool operator!=(const RECT &lhs, const RECT &rhs) noexcept {
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return !operator==(lhs, rhs);
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}
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static inline constexpr QPoint point2qpoint(const POINT &point) {
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return QPoint{int(point.x), int(point.y)};
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}
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static inline constexpr POINT qpoint2point(const QPoint &point) {
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return POINT{LONG(point.x()), LONG(point.y())};
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}
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static inline constexpr QSize size2qsize(const SIZE &size) {
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return QSize{int(size.cx), int(size.cy)};
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}
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static inline constexpr SIZE qsize2size(const QSize &size) {
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return SIZE{LONG(size.width()), LONG(size.height())};
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}
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static inline constexpr QRect rect2qrect(const RECT &rect) {
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return QRect{
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QPoint{int(rect.left), int(rect.top) },
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QSize{int(RECT_WIDTH(rect)), int(RECT_HEIGHT(rect))}
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};
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}
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static inline constexpr RECT qrect2rect(const QRect &qrect) {
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return RECT{LONG(qrect.left()), LONG(qrect.top()), LONG(qrect.right()),
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LONG(qrect.bottom())};
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}
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static inline /*constexpr*/ QString hwnd2str(const WId windowId) {
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// NULL handle is allowed here.
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return QLatin1String("0x") +
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QString::number(windowId, 16).toUpper().rightJustified(8, u'0');
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}
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static inline /*constexpr*/ QString hwnd2str(HWND hwnd) {
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// NULL handle is allowed here.
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return hwnd2str(reinterpret_cast<WId>(hwnd));
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}
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static inline bool isWin8OrGreater() {
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static const bool result = ::IsWindows8OrGreater();
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return result;
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}
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static inline bool isWin8Point1OrGreater() {
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static const bool result = ::IsWindows8Point1OrGreater();
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return result;
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}
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static inline bool isWin10OrGreater() {
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static const bool result = ::IsWindows10OrGreater();
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return result;
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}
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static inline bool isWin11OrGreater() {
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static const bool result = ::IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WIN10), LOBYTE(_WIN32_WINNT_WIN10), 22000);
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return result;
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}
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static inline bool isDwmCompositionEnabled() {
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if (isWin8OrGreater()) {
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return true;
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}
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const DynamicApis &apis = DynamicApis::instance();
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if (!apis.pDwmIsCompositionEnabled) {
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return false;
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}
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BOOL enabled = FALSE;
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return SUCCEEDED(apis.pDwmIsCompositionEnabled(&enabled)) && enabled;
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}
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static inline void triggerFrameChange(HWND hwnd) {
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::SetWindowPos(hwnd, nullptr, 0, 0, 0, 0,
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SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER |
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SWP_FRAMECHANGED);
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}
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static inline quint32 getDpiForWindow(HWND hwnd) {
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const DynamicApis &apis = DynamicApis::instance();
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if (apis.pGetDpiForWindow) { // Win10
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return apis.pGetDpiForWindow(hwnd);
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} else if (apis.pGetDpiForMonitor) { // Win8.1
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HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
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UINT dpiX{0};
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UINT dpiY{0};
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apis.pGetDpiForMonitor(monitor, MDT_EFFECTIVE_DPI, &dpiX, &dpiY);
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return dpiX;
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} else { // Win2K
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HDC hdc = ::GetDC(nullptr);
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const int dpiX = ::GetDeviceCaps(hdc, LOGPIXELSX);
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const int dpiY = ::GetDeviceCaps(hdc, LOGPIXELSY);
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::ReleaseDC(nullptr, hdc);
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return quint32(dpiX);
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}
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}
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static inline quint32 getResizeBorderThickness(HWND hwnd) {
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const DynamicApis &apis = DynamicApis::instance();
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if (apis.pGetSystemMetricsForDpi) {
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const quint32 dpi = getDpiForWindow(hwnd);
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return apis.pGetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) +
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apis.pGetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
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} else {
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return ::GetSystemMetrics(SM_CXSIZEFRAME) + ::GetSystemMetrics(SM_CXPADDEDBORDER);
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}
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}
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static inline quint32 getTitleBarHeight(HWND hwnd) {
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const auto captionHeight = [hwnd]() -> int {
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const DynamicApis &apis = DynamicApis::instance();
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if (apis.pGetSystemMetricsForDpi) {
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const quint32 dpi = getDpiForWindow(hwnd);
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return apis.pGetSystemMetricsForDpi(SM_CYCAPTION, dpi);
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} else {
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return ::GetSystemMetrics(SM_CYCAPTION);
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}
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}();
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return captionHeight + getResizeBorderThickness(hwnd);
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}
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static inline void updateInternalWindowFrameMargins(HWND hwnd, QWindow *window) {
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const auto margins = [hwnd]() -> QMargins {
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const int titleBarHeight = getTitleBarHeight(hwnd);
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if (isWin10OrGreater()) {
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return {0, -titleBarHeight, 0, 0};
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} else {
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const int frameSize = getResizeBorderThickness(hwnd);
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return {-frameSize, -titleBarHeight, -frameSize, -frameSize};
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}
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}();
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const QVariant marginsVar = QVariant::fromValue(margins);
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window->setProperty("_q_windowsCustomMargins", marginsVar);
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#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
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if (QPlatformWindow *platformWindow = window->handle()) {
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if (const auto ni = QGuiApplication::platformNativeInterface()) {
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ni->setWindowProperty(platformWindow, QStringLiteral("_q_windowsCustomMargins"),
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marginsVar);
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}
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}
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#else
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if (const auto platformWindow =
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dynamic_cast<QNativeInterface::Private::QWindowsWindow *>(window->handle())) {
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platformWindow->setCustomMargins(margins);
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}
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#endif
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}
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static inline MONITORINFOEXW getMonitorForWindow(HWND hwnd) {
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// Use "MONITOR_DEFAULTTONEAREST" here so that we can still get the correct
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// monitor even if the window is minimized.
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HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
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MONITORINFOEXW monitorInfo{};
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monitorInfo.cbSize = sizeof(monitorInfo);
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::GetMonitorInfoW(monitor, &monitorInfo);
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return monitorInfo;
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};
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static inline void moveToDesktopCenter(HWND hwnd) {
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const auto monitorInfo = getMonitorForWindow(hwnd);
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RECT windowRect{};
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::GetWindowRect(hwnd, &windowRect);
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const auto newX = (RECT_WIDTH(monitorInfo.rcMonitor) - RECT_WIDTH(windowRect)) / 2;
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const auto newY = (RECT_HEIGHT(monitorInfo.rcMonitor) - RECT_HEIGHT(windowRect)) / 2;
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::SetWindowPos(hwnd, nullptr, newX, newY, 0, 0,
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SWP_NOACTIVATE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER);
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}
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static inline bool isFullScreen(HWND hwnd) {
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RECT windowRect{};
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::GetWindowRect(hwnd, &windowRect);
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// Compare to the full area of the screen, not the work area.
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return (windowRect == getMonitorForWindow(hwnd).rcMonitor);
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}
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static inline bool isWindowNoState(HWND hwnd) {
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#if 0
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WINDOWPLACEMENT wp{};
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wp.length = sizeof(wp);
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::GetWindowPlacement(hwnd, &wp);
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return ((wp.showCmd == SW_NORMAL) || (wp.showCmd == SW_RESTORE));
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#else
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const auto style = static_cast<DWORD>(::GetWindowLongPtrW(hwnd, GWL_STYLE));
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return (!(style & (WS_MINIMIZE | WS_MAXIMIZE)));
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#endif
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}
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static inline void syncPaintEventWithDwm() {
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// No need to sync with DWM if DWM composition is disabled.
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if (!isDwmCompositionEnabled()) {
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return;
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}
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const DynamicApis &apis = DynamicApis::instance();
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// Dirty hack to workaround the resize flicker caused by DWM.
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LARGE_INTEGER freq{};
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::QueryPerformanceFrequency(&freq);
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TIMECAPS tc{};
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apis.ptimeGetDevCaps(&tc, sizeof(tc));
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const UINT ms_granularity = tc.wPeriodMin;
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apis.ptimeBeginPeriod(ms_granularity);
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LARGE_INTEGER now0{};
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::QueryPerformanceCounter(&now0);
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// ask DWM where the vertical blank falls
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DWM_TIMING_INFO dti{};
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dti.cbSize = sizeof(dti);
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apis.pDwmGetCompositionTimingInfo(nullptr, &dti);
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LARGE_INTEGER now1{};
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::QueryPerformanceCounter(&now1);
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// - DWM told us about SOME vertical blank
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// - past or future, possibly many frames away
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// - convert that into the NEXT vertical blank
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const auto period = qreal(dti.qpcRefreshPeriod);
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const auto dt = qreal(dti.qpcVBlank - now1.QuadPart);
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const qreal ratio = (dt / period);
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auto w = qreal(0);
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auto m = qreal(0);
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if ((dt > qreal(0)) || qFuzzyIsNull(dt)) {
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w = ratio;
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} else {
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// reach back to previous period
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// - so m represents consistent position within phase
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w = (ratio - qreal(1));
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}
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m = (dt - (period * w));
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if ((m < qreal(0)) || qFuzzyCompare(m, period) || (m > period)) {
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return;
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}
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const qreal m_ms = (qreal(1000) * m / qreal(freq.QuadPart));
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::Sleep(static_cast<DWORD>(std::round(m_ms)));
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apis.ptimeEndPeriod(ms_granularity);
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}
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static inline void showSystemMenu2(HWND hWnd, const POINT &pos, const bool selectFirstEntry)
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{
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const HMENU hMenu = ::GetSystemMenu(hWnd, FALSE);
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if (!hMenu) {
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// The corresponding window doesn't have a system menu, most likely due to the
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// lack of the "WS_SYSMENU" window style. This situation should not be treated
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// as an error so just ignore it and return early.
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return;
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}
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// Tweak the menu items according to the current window status and user settings.
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const bool disableClose = /*data->callbacks->getProperty(kSysMenuDisableCloseVar, false).toBool()*/false;
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const bool disableRestore = /*data->callbacks->getProperty(kSysMenuDisableRestoreVar, false).toBool()*/false;
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const bool disableMinimize = /*data->callbacks->getProperty(kSysMenuDisableMinimizeVar, false).toBool()*/false;
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const bool disableMaximize = /*data->callbacks->getProperty(kSysMenuDisableMaximizeVar, false).toBool()*/false;
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const bool disableSize = /*data->callbacks->getProperty(kSysMenuDisableSizeVar, false).toBool()*/false;
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const bool disableMove = /*data->callbacks->getProperty(kSysMenuDisableMoveVar, false).toBool()*/false;
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const bool removeClose = /*data->callbacks->getProperty(kSysMenuRemoveCloseVar, false).toBool()*/false;
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const bool removeSeparator = /*data->callbacks->getProperty(kSysMenuRemoveSeparatorVar, false).toBool()*/false;
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const bool removeRestore = /*data->callbacks->getProperty(kSysMenuRemoveRestoreVar, false).toBool()*/false;
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const bool removeMinimize = /*data->callbacks->getProperty(kSysMenuRemoveMinimizeVar, false).toBool()*/false;
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const bool removeMaximize = /*data->callbacks->getProperty(kSysMenuRemoveMaximizeVar, false).toBool()*/false;
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const bool removeSize = /*data->callbacks->getProperty(kSysMenuRemoveSizeVar, false).toBool()*/false;
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const bool removeMove = /*data->callbacks->getProperty(kSysMenuRemoveMoveVar, false).toBool()*/false;
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const bool maxOrFull = IsMaximized(hWnd) || isFullScreen(hWnd);
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const bool fixedSize = /*data->callbacks->isWindowFixedSize()*/false;
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if (removeClose) {
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::DeleteMenu(hMenu, SC_CLOSE, MF_BYCOMMAND);
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} else {
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::EnableMenuItem(hMenu, SC_CLOSE, (MF_BYCOMMAND | (disableClose ? MFS_DISABLED : MFS_ENABLED)));
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}
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if (removeSeparator) {
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// Looks like we must use 0 for the second parameter here, otherwise we can't remove the separator.
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::DeleteMenu(hMenu, 0, MFT_SEPARATOR);
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}
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if (removeMaximize) {
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::DeleteMenu(hMenu, SC_MAXIMIZE, MF_BYCOMMAND);
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} else {
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::EnableMenuItem(hMenu, SC_MAXIMIZE, (MF_BYCOMMAND | ((maxOrFull || fixedSize || disableMaximize) ? MFS_DISABLED : MFS_ENABLED)));
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}
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if (removeRestore) {
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::DeleteMenu(hMenu, SC_RESTORE, MF_BYCOMMAND);
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} else {
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::EnableMenuItem(hMenu, SC_RESTORE, (MF_BYCOMMAND | ((maxOrFull && !fixedSize && !disableRestore) ? MFS_ENABLED : MFS_DISABLED)));
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// The first menu item should be selected by default if the menu is brought
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// up by keyboard. I don't know how to pre-select a menu item but it seems
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// highlight can do the job. However, there's an annoying issue if we do
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// this manually: the highlighted menu item is really only highlighted,
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// not selected, so even if the mouse cursor hovers on other menu items
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// or the user navigates to other menu items through keyboard, the original
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// highlight bar will not move accordingly, the OS will generate another
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// highlight bar to indicate the current selected menu item, which will make
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// the menu look kind of weird. Currently I don't know how to fix this issue.
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::HiliteMenuItem(hWnd, hMenu, SC_RESTORE, (MF_BYCOMMAND | (selectFirstEntry ? MFS_HILITE : MFS_UNHILITE)));
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}
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if (removeMinimize) {
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::DeleteMenu(hMenu, SC_MINIMIZE, MF_BYCOMMAND);
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} else {
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::EnableMenuItem(hMenu, SC_MINIMIZE, (MF_BYCOMMAND | (disableMinimize ? MFS_DISABLED : MFS_ENABLED)));
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}
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if (removeSize) {
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::DeleteMenu(hMenu, SC_SIZE, MF_BYCOMMAND);
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} else {
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::EnableMenuItem(hMenu, SC_SIZE, (MF_BYCOMMAND | ((maxOrFull || fixedSize || disableSize || disableMinimize || disableMaximize) ? MFS_DISABLED : MFS_ENABLED)));
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}
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if (removeMove) {
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::DeleteMenu(hMenu, SC_MOVE, MF_BYCOMMAND);
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} else {
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::EnableMenuItem(hMenu, SC_MOVE, (MF_BYCOMMAND | ((maxOrFull || disableMove) ? MFS_DISABLED : MFS_ENABLED)));
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}
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// The default menu item will appear in bold font. There can only be one default
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// menu item per menu at most. Set the item ID to "UINT_MAX" (or simply "-1")
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// can clear the default item for the given menu.
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std::optional<UINT> defaultItemId = std::nullopt;
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if (isWin11OrGreater()) {
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if (maxOrFull) {
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if (!removeRestore) {
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defaultItemId = SC_RESTORE;
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}
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} else {
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if (!removeMaximize) {
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defaultItemId = SC_MAXIMIZE;
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}
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}
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}
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if (!(defaultItemId.has_value() || removeClose)) {
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defaultItemId = SC_CLOSE;
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}
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::SetMenuDefaultItem(hMenu, defaultItemId.value_or(UINT_MAX), FALSE);
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::DrawMenuBar(hWnd);
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// Popup the system menu at the required position.
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const auto result = ::TrackPopupMenu(hMenu, (TPM_RETURNCMD | (QGuiApplication::isRightToLeft() ? TPM_RIGHTALIGN : TPM_LEFTALIGN)), pos.x, pos.y, 0, hWnd, nullptr);
|
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if (!removeRestore) {
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// Unhighlight the first menu item after the popup menu is closed, otherwise it will keep
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// highlighting until we unhighlight it manually.
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::HiliteMenuItem(hWnd, hMenu, SC_RESTORE, (MF_BYCOMMAND | MFS_UNHILITE));
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}
|
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if (!result) {
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// The user canceled the menu, no need to continue.
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return;
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}
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// Send the command that the user chooses to the corresponding window.
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::PostMessageW(hWnd, WM_SYSCOMMAND, result, 0);
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}
|
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static inline Win32WindowContext::WindowPart getHitWindowPart(int hitTestResult) {
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switch (hitTestResult) {
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case HTCLIENT:
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return Win32WindowContext::ClientArea;
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case HTCAPTION:
|
return Win32WindowContext::TitleBar;
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case HTSYSMENU:
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case HTHELP:
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case HTREDUCE:
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case HTZOOM:
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case HTCLOSE:
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return Win32WindowContext::ChromeButton;
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case HTLEFT:
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case HTRIGHT:
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case HTTOP:
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case HTTOPLEFT:
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case HTTOPRIGHT:
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case HTBOTTOM:
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case HTBOTTOMLEFT:
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case HTBOTTOMRIGHT:
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return Win32WindowContext::ResizeBorder;
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case HTBORDER:
|
return Win32WindowContext::FixedBorder;
|
default:
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break; // unreachable
|
}
|
return Win32WindowContext::Outside;
|
}
|
|
static bool isValidWindow(HWND hWnd, bool checkVisible, bool checkTopLevel) {
|
if (!::IsWindow(hWnd)) {
|
return false;
|
}
|
const LONG_PTR styles = ::GetWindowLongPtrW(hWnd, GWL_STYLE);
|
if (styles & WS_DISABLED) {
|
return false;
|
}
|
const LONG_PTR exStyles = ::GetWindowLongPtrW(hWnd, GWL_EXSTYLE);
|
if (exStyles & WS_EX_TOOLWINDOW) {
|
return false;
|
}
|
RECT rect{};
|
if (!::GetWindowRect(hWnd, &rect)) {
|
return false;
|
}
|
if ((rect.left >= rect.right) || (rect.top >= rect.bottom)) {
|
return false;
|
}
|
if (checkVisible) {
|
if (!::IsWindowVisible(hWnd)) {
|
return false;
|
}
|
}
|
if (checkTopLevel) {
|
if (::GetAncestor(hWnd, GA_ROOT) != hWnd) {
|
return false;
|
}
|
}
|
return true;
|
}
|
|
// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1556
|
// In QWindowsContext::windowsProc(), the messages will be passed to all global native event
|
// filters, but because we have already filtered the messages in the hook WndProc function for
|
// convenience, Qt does not know we may have already processed the messages and thus will call
|
// DefWindowProc(). Consequently, we have to add a global native filter that forwards the result
|
// of the hook function, telling Qt whether we have filtered the events before. Since Qt only
|
// handles Windows window messages in the main thread, it is safe to do so.
|
class WindowsNativeEventFilter : public QAbstractNativeEventFilter {
|
public:
|
bool nativeEventFilter(const QByteArray &eventType, void *message,
|
QT_NATIVE_EVENT_RESULT_TYPE *result) override {
|
Q_UNUSED(eventType)
|
|
// It has been observed that the pointer that Qt gives us is sometimes null on some
|
// machines. We need to guard against it in such scenarios.
|
if (!result) {
|
return false;
|
}
|
|
// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1546
|
// Qt needs to refer to the WM_NCCALCSIZE message data that hasn't been processed, so we
|
// have to process it after Qt acquires the initial data.
|
auto msg = static_cast<const MSG *>(message);
|
if (msg->message == WM_NCCALCSIZE && lastMessageContext) {
|
LRESULT res;
|
if (lastMessageContext->nonClientCalcSizeHandler(msg->hwnd, msg->message,
|
msg->wParam, msg->lParam, &res)) {
|
*result = decltype(*result)(res);
|
return true;
|
}
|
}
|
return false;
|
}
|
|
static WindowsNativeEventFilter *instance;
|
static Win32WindowContext *lastMessageContext;
|
|
static inline void install() {
|
if (instance) {
|
return;
|
}
|
instance = new WindowsNativeEventFilter();
|
installNativeEventFilter(instance);
|
}
|
|
static inline void uninstall() {
|
if (!instance) {
|
return;
|
}
|
removeNativeEventFilter(instance);
|
delete instance;
|
instance = nullptr;
|
}
|
};
|
|
WindowsNativeEventFilter *WindowsNativeEventFilter::instance = nullptr;
|
Win32WindowContext *WindowsNativeEventFilter::lastMessageContext = nullptr;
|
|
// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1025
|
// We can see from the source code that Qt will filter out some messages first and then send the
|
// unfiltered messages to the event dispatcher. To activate the Snap Layout feature on Windows
|
// 11, we must process some non-client area messages ourselves, but unfortunately these messages
|
// have been filtered out already in that line, and thus we'll never have the chance to process
|
// them ourselves. This is Qt's low level platform specific code, so we don't have any official
|
// ways to change this behavior. But luckily we can replace the window procedure function of
|
// Qt's windows, and in this hooked window procedure function, we finally have the chance to
|
// process window messages before Qt touches them. So we reconstruct the MSG structure and send
|
// it to our own custom native event filter to do all the magic works. But since the system menu
|
// feature doesn't necessarily belong to the native implementation, we seperate the handling
|
// code and always process the system menu part in this function for both implementations.
|
//
|
// Original event flow:
|
// [Entry] Windows Message Queue
|
// |
|
// [Qt Window Proc] qwindowscontext.cpp#L1547: qWindowsWndProc()
|
// ```
|
// const bool handled = QWindowsContext::instance()->windowsProc
|
// (hwnd, message, et, wParam, lParam, &result,
|
// &platformWindow);
|
// ```
|
// |
|
// [Non-Input Filter] qwindowscontext.cpp#L1025: QWindowsContext::windowsProc()
|
// ```
|
// if (!isInputMessage(msg.message) &&
|
// filterNativeEvent(&msg, result))
|
// return true;
|
// ```
|
// |
|
// [User Filter] qwindowscontext.cpp#L1588: QWindowsContext::windowsProc()
|
// ```
|
// QAbstractEventDispatcher *dispatcher =
|
// QAbstractEventDispatcher::instance();
|
// qintptr filterResult = 0;
|
// if (dispatcher &&
|
// dispatcher->filterNativeEvent(nativeEventType(), msg,
|
// &filterResult)) {
|
// *result = LRESULT(filterResult);
|
// return true;
|
// }
|
// ```
|
// |
|
// [Extra work] The rest of QWindowsContext::windowsProc() and qWindowsWndProc()
|
//
|
// Notice: Only non-input messages will be processed by the user-defined global native event
|
// filter!!! These events are then passed to the widget class's own overridden
|
// QWidget::nativeEvent() as a local filter, where all native events can be handled, but we must
|
// create a new class derived from QWidget which we don't intend to. Therefore, we don't expect
|
// to process events from the global native event filter, but instead hook Qt's window
|
// procedure.
|
|
extern "C" LRESULT QT_WIN_CALLBACK QWKHookedWndProc(HWND hWnd, UINT message, WPARAM wParam,
|
LPARAM lParam) {
|
Q_ASSERT(hWnd);
|
if (!hWnd) {
|
return FALSE;
|
}
|
|
// Search window context
|
auto ctx = g_wndProcHash->value(hWnd);
|
if (!ctx) {
|
return ::DefWindowProcW(hWnd, message, wParam, lParam);
|
}
|
|
// Since Qt does the necessary processing of the WM_NCCALCSIZE message, we need to
|
// forward it right away and process it in our native event filter.
|
if (message == WM_NCCALCSIZE) {
|
WindowsNativeEventFilter::lastMessageContext = ctx;
|
LRESULT result = ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
|
WindowsNativeEventFilter::lastMessageContext = nullptr;
|
return result;
|
}
|
|
// Try hooked procedure and save result
|
LRESULT result;
|
if (ctx->windowProc(hWnd, message, wParam, lParam, &result)) {
|
return result;
|
}
|
|
// Continue dispatching.
|
return ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
|
}
|
|
Win32WindowContext::Win32WindowContext() : AbstractWindowContext() {
|
}
|
|
Win32WindowContext::~Win32WindowContext() {
|
// Remove window handle mapping
|
if (auto hWnd = reinterpret_cast<HWND>(windowId); hWnd) {
|
g_wndProcHash->remove(hWnd);
|
|
// Remove event filter if the all windows has been destroyed
|
if (g_wndProcHash->empty()) {
|
WindowsNativeEventFilter::uninstall();
|
}
|
}
|
}
|
|
bool Win32WindowContext::setupHost() {
|
// Install window hook
|
auto winId = m_windowHandle->winId();
|
auto hWnd = reinterpret_cast<HWND>(winId);
|
|
// Inform Qt we want and have set custom margins
|
updateInternalWindowFrameMargins(hWnd, m_windowHandle);
|
|
// Store original window proc
|
if (!g_qtWindowProc) {
|
g_qtWindowProc = reinterpret_cast<WNDPROC>(::GetWindowLongPtrW(hWnd, GWLP_WNDPROC));
|
}
|
|
// Hook window proc
|
::SetWindowLongPtrW(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(QWKHookedWndProc));
|
|
// Install global native event filter
|
WindowsNativeEventFilter::install();
|
|
// Cache window ID
|
windowId = winId;
|
|
// Save window handle mapping
|
g_wndProcHash->insert(hWnd, this);
|
|
return true;
|
}
|
|
bool Win32WindowContext::windowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam,
|
LRESULT *result) {
|
*result = FALSE;
|
|
// We should skip these messages otherwise we will get crashes.
|
// NOTE: WM_QUIT won't be posted to the WindowProc function.
|
switch (message) {
|
case WM_CLOSE:
|
case WM_DESTROY:
|
case WM_NCDESTROY:
|
// Undocumented messages:
|
case WM_UAHDESTROYWINDOW:
|
case WM_UNREGISTER_WINDOW_SERVICES:
|
return false;
|
default:
|
break;
|
}
|
|
if (!isValidWindow(hWnd, false, true)) {
|
return false;
|
}
|
|
if (systemMenuHandler(hWnd, message, wParam, lParam, result)) {
|
return true;
|
}
|
|
// Test snap layout
|
if (snapLayoutHandler(hWnd, message, wParam, lParam, result)) {
|
return true;
|
}
|
|
// Main implementation
|
if (customWindowHandler(hWnd, message, wParam, lParam, result)) {
|
return true;
|
}
|
|
return false; // Not handled
|
}
|
|
static constexpr const auto kMessageTag = WPARAM(0x97CCEA99);
|
|
static inline constexpr bool isTaggedMessage(WPARAM wParam) {
|
return (wParam == kMessageTag);
|
}
|
|
static inline quint64 getKeyState() {
|
quint64 result = 0;
|
const auto &get = [](const int virtualKey) -> bool {
|
return (::GetAsyncKeyState(virtualKey) < 0);
|
};
|
const bool buttonSwapped = ::GetSystemMetrics(SM_SWAPBUTTON);
|
if (get(VK_LBUTTON)) {
|
result |= (buttonSwapped ? MK_RBUTTON : MK_LBUTTON);
|
}
|
if (get(VK_RBUTTON)) {
|
result |= (buttonSwapped ? MK_LBUTTON : MK_RBUTTON);
|
}
|
if (get(VK_SHIFT)) {
|
result |= MK_SHIFT;
|
}
|
if (get(VK_CONTROL)) {
|
result |= MK_CONTROL;
|
}
|
if (get(VK_MBUTTON)) {
|
result |= MK_MBUTTON;
|
}
|
if (get(VK_XBUTTON1)) {
|
result |= MK_XBUTTON1;
|
}
|
if (get(VK_XBUTTON2)) {
|
result |= MK_XBUTTON2;
|
}
|
return result;
|
}
|
|
static void emulateClientAreaMessage(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam,
|
const std::optional<int> &overrideMessage = std::nullopt) {
|
const int myMsg = overrideMessage.value_or(message);
|
const auto wParamNew = [myMsg, wParam]() -> WPARAM {
|
if (myMsg == WM_NCMOUSELEAVE) {
|
// wParam is always ignored in mouse leave messages, but here we
|
// give them a special tag to be able to distinguish which messages
|
// are sent by ourselves.
|
return kMessageTag;
|
}
|
const quint64 keyState = getKeyState();
|
if ((myMsg >= WM_NCXBUTTONDOWN) && (myMsg <= WM_NCXBUTTONDBLCLK)) {
|
const auto xButtonMask = GET_XBUTTON_WPARAM(wParam);
|
return MAKEWPARAM(keyState, xButtonMask);
|
}
|
return keyState;
|
}();
|
const auto lParamNew = [myMsg, lParam, hWnd]() -> LPARAM {
|
if (myMsg == WM_NCMOUSELEAVE) {
|
// lParam is always ignored in mouse leave messages.
|
return 0;
|
}
|
const auto screenPos = POINT{GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
|
POINT clientPos = screenPos;
|
::ScreenToClient(hWnd, &clientPos);
|
return MAKELPARAM(clientPos.x, clientPos.y);
|
}();
|
#if 0
|
# define SEND_MESSAGE ::SendMessageW
|
#else
|
# define SEND_MESSAGE ::PostMessageW
|
#endif
|
switch (myMsg) {
|
case WM_NCHITTEST: // Treat hit test messages as mouse move events.
|
case WM_NCMOUSEMOVE:
|
SEND_MESSAGE(hWnd, WM_MOUSEMOVE, wParamNew, lParamNew);
|
break;
|
case WM_NCLBUTTONDOWN:
|
SEND_MESSAGE(hWnd, WM_LBUTTONDOWN, wParamNew, lParamNew);
|
break;
|
case WM_NCLBUTTONUP:
|
SEND_MESSAGE(hWnd, WM_LBUTTONUP, wParamNew, lParamNew);
|
break;
|
case WM_NCLBUTTONDBLCLK:
|
SEND_MESSAGE(hWnd, WM_LBUTTONDBLCLK, wParamNew, lParamNew);
|
break;
|
case WM_NCRBUTTONDOWN:
|
SEND_MESSAGE(hWnd, WM_RBUTTONDOWN, wParamNew, lParamNew);
|
break;
|
case WM_NCRBUTTONUP:
|
SEND_MESSAGE(hWnd, WM_RBUTTONUP, wParamNew, lParamNew);
|
break;
|
case WM_NCRBUTTONDBLCLK:
|
SEND_MESSAGE(hWnd, WM_RBUTTONDBLCLK, wParamNew, lParamNew);
|
break;
|
case WM_NCMBUTTONDOWN:
|
SEND_MESSAGE(hWnd, WM_MBUTTONDOWN, wParamNew, lParamNew);
|
break;
|
case WM_NCMBUTTONUP:
|
SEND_MESSAGE(hWnd, WM_MBUTTONUP, wParamNew, lParamNew);
|
break;
|
case WM_NCMBUTTONDBLCLK:
|
SEND_MESSAGE(hWnd, WM_MBUTTONDBLCLK, wParamNew, lParamNew);
|
break;
|
case WM_NCXBUTTONDOWN:
|
SEND_MESSAGE(hWnd, WM_XBUTTONDOWN, wParamNew, lParamNew);
|
break;
|
case WM_NCXBUTTONUP:
|
SEND_MESSAGE(hWnd, WM_XBUTTONUP, wParamNew, lParamNew);
|
break;
|
case WM_NCXBUTTONDBLCLK:
|
SEND_MESSAGE(hWnd, WM_XBUTTONDBLCLK, wParamNew, lParamNew);
|
break;
|
#if 0 // ### TODO: How to handle touch events?
|
case WM_NCPOINTERUPDATE:
|
case WM_NCPOINTERDOWN:
|
case WM_NCPOINTERUP:
|
break;
|
#endif
|
case WM_NCMOUSEHOVER:
|
SEND_MESSAGE(hWnd, WM_MOUSEHOVER, wParamNew, lParamNew);
|
break;
|
case WM_NCMOUSELEAVE:
|
SEND_MESSAGE(hWnd, WM_MOUSELEAVE, wParamNew, lParamNew);
|
break;
|
default:
|
break;
|
}
|
|
#undef SEND_MESSAGE
|
}
|
|
static inline void requestForMouseLeaveMessage(HWND hWnd, bool nonClient) {
|
TRACKMOUSEEVENT tme{};
|
tme.cbSize = sizeof(tme);
|
tme.dwFlags = TME_LEAVE;
|
if (nonClient) {
|
tme.dwFlags |= TME_NONCLIENT;
|
}
|
tme.hwndTrack = hWnd;
|
tme.dwHoverTime = HOVER_DEFAULT;
|
::TrackMouseEvent(&tme);
|
}
|
|
bool Win32WindowContext::snapLayoutHandler(HWND hWnd, UINT message, WPARAM wParam,
|
LPARAM lParam, LRESULT *result) {
|
switch (message) {
|
case WM_MOUSELEAVE: {
|
if (!isTaggedMessage(wParam)) {
|
// Qt will call TrackMouseEvent() to get the WM_MOUSELEAVE message when it
|
// receives WM_MOUSEMOVE messages, and since we are converting every
|
// WM_NCMOUSEMOVE message to WM_MOUSEMOVE message and send it back to the window
|
// to be able to hover our controls, we also get lots of WM_MOUSELEAVE messages
|
// at the same time because of the reason above, and these superfluous mouse
|
// leave events cause Qt to think the mouse has left the control, and thus we
|
// actually lost the hover state. So we filter out these superfluous mouse leave
|
// events here to avoid this issue.
|
DWORD dwScreenPos = ::GetMessagePos();
|
POINT screenPoint{GET_X_LPARAM(dwScreenPos), GET_Y_LPARAM(dwScreenPos)};
|
::ScreenToClient(hWnd, &screenPoint);
|
QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
|
QPoint{screenPoint.x, screenPoint.y}, m_windowHandle);
|
auto dummy = CoreWindowAgent::Unknown;
|
if (isInSystemButtons(qtScenePos, &dummy)) {
|
// We must record whether the last WM_MOUSELEAVE was filtered, because if
|
// Qt does not receive this message it will not call TrackMouseEvent()
|
// again, resulting in the client area not responding to any mouse event.
|
mouseLeaveBlocked = true;
|
*result = FALSE;
|
return true;
|
}
|
}
|
mouseLeaveBlocked = false;
|
break;
|
}
|
|
case WM_MOUSEMOVE: {
|
// At appropriate time, we will call TrackMouseEvent() for Qt. Simultaneously,
|
// we unset `mouseLeaveBlocked` mark and pretend as if Qt has received
|
// WM_MOUSELEAVE.
|
if (lastHitTestResult != WindowPart::ChromeButton && mouseLeaveBlocked) {
|
mouseLeaveBlocked = false;
|
requestForMouseLeaveMessage(hWnd, false);
|
}
|
break;
|
}
|
|
case WM_NCMOUSEMOVE:
|
case WM_NCLBUTTONDOWN:
|
case WM_NCLBUTTONUP:
|
case WM_NCLBUTTONDBLCLK:
|
case WM_NCRBUTTONDOWN:
|
case WM_NCRBUTTONUP:
|
case WM_NCRBUTTONDBLCLK:
|
case WM_NCMBUTTONDOWN:
|
case WM_NCMBUTTONUP:
|
case WM_NCMBUTTONDBLCLK:
|
case WM_NCXBUTTONDOWN:
|
case WM_NCXBUTTONUP:
|
case WM_NCXBUTTONDBLCLK:
|
#if 0 // ### TODO: How to handle touch events?
|
case WM_NCPOINTERUPDATE:
|
case WM_NCPOINTERDOWN:
|
case WM_NCPOINTERUP:
|
#endif
|
case WM_NCMOUSEHOVER: {
|
const WindowPart currentWindowPart = lastHitTestResult;
|
if (message == WM_NCMOUSEMOVE) {
|
if (currentWindowPart != WindowPart::ChromeButton) {
|
m_delegate->resetQtGrabbedControl();
|
if (mouseLeaveBlocked) {
|
emulateClientAreaMessage(hWnd, message, wParam, lParam,
|
WM_NCMOUSELEAVE);
|
}
|
}
|
|
// We need to make sure we get the right hit-test result when a WM_NCMOUSELEAVE
|
// comes, so we reset it when we receive a WM_NCMOUSEMOVE.
|
|
// If the mouse is entering the client area, there must be a WM_NCHITTEST
|
// setting it to `Client` before the WM_NCMOUSELEAVE comes; if the mouse is
|
// leaving the window, current window part remains as `Outside`.
|
lastHitTestResult = WindowPart::Outside;
|
}
|
|
if (currentWindowPart == WindowPart::ChromeButton) {
|
emulateClientAreaMessage(hWnd, message, wParam, lParam);
|
if (message == WM_NCMOUSEMOVE) {
|
// ### FIXME FIXME FIXME
|
// ### FIXME: Calling DefWindowProc() here is really dangerous, investigate
|
// how to avoid doing this.
|
// ### FIXME FIXME FIXME
|
*result = ::DefWindowProcW(hWnd, WM_NCMOUSEMOVE, wParam, lParam);
|
} else {
|
// According to MSDN, we should return non-zero for X button messages to
|
// indicate we have handled these messages (due to historical reasons), for
|
// all other messages we should return zero instead.
|
*result =
|
(((message >= WM_NCXBUTTONDOWN) && (message <= WM_NCXBUTTONDBLCLK))
|
? TRUE
|
: FALSE);
|
}
|
return true;
|
}
|
break;
|
}
|
|
case WM_NCMOUSELEAVE: {
|
const WindowPart currentWindowPart = lastHitTestResult;
|
if (currentWindowPart == WindowPart::ChromeButton) {
|
// If we press on the chrome button and move mouse, Windows will take the
|
// pressing area as HTCLIENT which maybe because of our former retransmission of
|
// WM_NCLBUTTONDOWN, as a result, a WM_NCMOUSELEAVE will come immediately and a
|
// lot of WM_MOUSEMOVE will come if we move the mouse, we should track the mouse
|
// in advance.
|
if (mouseLeaveBlocked) {
|
mouseLeaveBlocked = false;
|
requestForMouseLeaveMessage(hWnd, false);
|
}
|
} else {
|
if (mouseLeaveBlocked) {
|
// The mouse is moving from the chrome button to other non-client area, we
|
// should emulate a WM_MOUSELEAVE message to reset the button state.
|
emulateClientAreaMessage(hWnd, message, wParam, lParam, WM_NCMOUSELEAVE);
|
}
|
|
if (currentWindowPart == WindowPart::Outside) {
|
// Notice: we're not going to clear window part cache when the mouse leaves
|
// window from client area, which means we will get previous window part as
|
// HTCLIENT if the mouse leaves window from client area and enters window
|
// from non-client area, but it has no bad effect.
|
m_delegate->resetQtGrabbedControl();
|
}
|
}
|
break;
|
}
|
|
default:
|
break;
|
}
|
return false;
|
}
|
|
bool Win32WindowContext::customWindowHandler(HWND hWnd, UINT message, WPARAM wParam,
|
LPARAM lParam, LRESULT *result) {
|
switch (message) {
|
case WM_SHOWWINDOW: {
|
if (!centered) {
|
// If wParam is TRUE, the window is being shown.
|
// If lParam is zero, the message was sent because of a call to the ShowWindow
|
// function.
|
if (wParam && lParam == 0) {
|
centered = true;
|
moveToDesktopCenter(hWnd);
|
}
|
}
|
break;
|
}
|
case WM_NCHITTEST: {
|
// 原生Win32窗口只有顶边是在窗口内部resize的，其余三边都是在窗口
|
// 外部进行resize的，其原理是，WS_THICKFRAME这个窗口样式会在窗
|
// 口的左、右和底边添加三个透明的resize区域，这三个区域在正常状态
|
// 下是完全不可见的，它们由DWM负责绘制和控制。这些区域的宽度等于
|
// (SM_CXSIZEFRAME + SM_CXPADDEDBORDER)，高度等于
|
// (SM_CYSIZEFRAME + SM_CXPADDEDBORDER)，在100%缩放时，均等
|
// 于8像素。它们属于窗口区域的一部分，但不属于客户区，而是属于非客
|
// 户区，因此GetWindowRect获取的区域中是包含这三个resize区域的，
|
// 而GetClientRect获取的区域是不包含它们的。当把
|
// DWMWA_EXTENDED_FRAME_BOUNDS作为参数调用
|
// DwmGetWindowAttribute时，也能获取到一个窗口大小，这个大小介
|
// 于前面两者之间，暂时不知道这个数据的意义及其作用。我们在
|
// WM_NCCALCSIZE消息的处理中，已经把整个窗口都设置为客户区了，也
|
// 就是说，我们的窗口已经没有非客户区了，因此那三个透明的resize区
|
// 域，此刻也已经成为窗口客户区的一部分了，从而变得不透明了。所以
|
// 现在的resize，看起来像是在窗口内部resize，是因为原本透明的地方
|
// 现在变得不透明了，实际上，单纯从范围上来看，现在我们resize的地方，
|
// 就是普通窗口的边框外部，那三个透明区域的范围。
|
// 因此，如果我们把边框完全去掉（就是我们正在做的事情），resize就
|
// 会看起来是在内部进行，这个问题通过常规方法非常难以解决。我测试过
|
// QQ和钉钉的窗口，它们的窗口就是在外部resize，但实际上它们是通过
|
// 把窗口实际的内容，嵌入到一个完全透明的但尺寸要大一圈的窗口中实现
|
// 的，虽然看起来效果还不错，但对于此项目而言，代码和窗口结构过于复
|
// 杂，因此我没有采用此方案。然而，对于具体的软件项目而言，其做法也
|
// 不失为一个优秀的解决方案，毕竟其在大多数条件下的表现都还可以。
|
//
|
// 和1.x的做法不同，现在的2.x选择了保留窗口三边，去除整个窗口顶部，
|
// 好处是保留了系统的原生边框，外观较好，且与系统结合紧密，而且resize
|
// 的表现也有很大改善，缺点是需要自行绘制顶部边框线。原本以为只能像
|
// Windows Terminal那样在WM_PAINT里搞黑魔法，但后来发现，其实只
|
// 要颜色相近，我们自行绘制一根实线也几乎能以假乱真，而且这样也不会
|
// 破坏Qt自己的绘制系统，能做到不依赖黑魔法就能实现像Windows Terminal
|
// 那样外观和功能都比较完美的自定义边框。
|
|
// A normal Win32 window can be resized outside of it. Here is the
|
// reason: the WS_THICKFRAME window style will cause a window has three
|
// transparent areas beside the window's left, right and bottom
|
// edge. Their width or height is eight pixels if the window is not
|
// scaled. In most cases, they are totally invisible. It's DWM's
|
// responsibility to draw and control them. They exist to let the
|
// user resize the window, visually outside of it. They are in the
|
// window area, but not the client area, so they are in the
|
// non-client area actually. But we have turned the whole window
|
// area into client area in WM_NCCALCSIZE, so the three transparent
|
// resize areas also become a part of the client area and thus they
|
// become visible. When we resize the window, it looks like we are
|
// resizing inside of it, however, that's because the transparent
|
// resize areas are visible now, we ARE resizing outside of the
|
// window actually. But I don't know how to make them become
|
// transparent again without breaking the frame shadow drawn by DWM.
|
// If you really want to solve it, you can try to embed your window
|
// into a larger transparent window and draw the frame shadow
|
// yourself. As what we have said in WM_NCCALCSIZE, you can only
|
// remove the top area of the window, this will let us be able to
|
// resize outside of the window and don't need much process in this
|
// message, it looks like a perfect plan, however, the top border is
|
// missing due to the whole top area is removed, and it's very hard
|
// to bring it back because we have to use a trick in WM_PAINT
|
// (learned from Windows Terminal), but no matter what we do in
|
// WM_PAINT, it will always break the backing store mechanism of Qt,
|
// so actually we can't do it. And it's very difficult to do such
|
// things in NativeEventFilters as well. What's worse, if we really
|
// do this, the four window borders will become white and they look
|
// horrible in dark mode. This solution only supports Windows 10
|
// because the border width on Win10 is only one pixel, however it's
|
// eight pixels on Windows 7 so preserving the three window borders
|
// looks terrible on old systems.
|
//
|
// Unlike the 1.x code, we choose to preserve the three edges of the
|
// window in 2.x, and get rid of the whole top part of the window.
|
// There are quite some advantages such as the appearance looks much
|
// better and due to we have the original system window frame, our
|
// window can behave just like a normal Win32 window even if we now
|
// doesn't have a title bar at all. Most importantly, the flicker and
|
// jitter during window resizing is totally gone now. The disadvantage
|
// is we have to draw a top frame border ourselves. Previously I thought
|
// we have to do the black magic in WM_PAINT just like what Windows
|
// Terminal does, however, later I found that if we choose a proper
|
// color, our homemade top border can almost have exactly the same
|
// appearance with the system's one.
|
|
[[maybe_unused]] const auto &hitTestRecorder = qScopeGuard([this, result]() {
|
lastHitTestResult = getHitWindowPart(int(*result)); //
|
});
|
|
POINT nativeGlobalPos{GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
|
POINT nativeLocalPos = nativeGlobalPos;
|
::ScreenToClient(hWnd, &nativeLocalPos);
|
|
RECT clientRect{0, 0, 0, 0};
|
::GetClientRect(hWnd, &clientRect);
|
auto clientWidth = RECT_WIDTH(clientRect);
|
auto clientHeight = RECT_HEIGHT(clientRect);
|
|
QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
|
QPoint(nativeLocalPos.x, nativeLocalPos.y), m_windowHandle);
|
|
bool isFixedSize = m_delegate->isHostSizeFixed(m_host);
|
bool isTitleBar = isInTitleBarDraggableArea(qtScenePos);
|
bool dontOverrideCursor = false; // ### TODO
|
|
CoreWindowAgent::SystemButton sysButtonType = CoreWindowAgent::Unknown;
|
if (!isFixedSize && isInSystemButtons(qtScenePos, &sysButtonType)) {
|
// Firstly, we set the hit test result to a default value to be able to detect
|
// whether we have changed it or not afterwards.
|
*result = HTNOWHERE;
|
// Even if the mouse is inside the chrome button area now, we should still allow
|
// the user to be able to resize the window with the top or right window border,
|
// this is also the normal behavior of a native Win32 window (but only when the
|
// window is not maximized/fullscreen/minimized, of course).
|
if (isWindowNoState(hWnd)) {
|
static constexpr const int kBorderSize = 2;
|
bool isTop = (nativeLocalPos.y <= kBorderSize);
|
bool isRight = (nativeLocalPos.x >= (clientWidth - kBorderSize));
|
if (isTop || isRight) {
|
if (dontOverrideCursor) {
|
// The user doesn't want the window to be resized, so we tell
|
// Windows we are in the client area so that the controls beneath
|
// the mouse cursor can still be hovered or clicked.
|
*result = (isTitleBar ? HTCAPTION : HTCLIENT);
|
} else {
|
if (isTop && isRight) {
|
*result = HTTOPRIGHT;
|
} else if (isTop) {
|
*result = HTTOP;
|
} else {
|
*result = HTRIGHT;
|
}
|
}
|
}
|
}
|
if (*result == HTNOWHERE) {
|
// OK, we are now really inside one of the chrome buttons, tell Windows the
|
// exact role of our button. The Snap Layout feature introduced in Windows
|
// 11 won't work without this.
|
switch (sysButtonType) {
|
case CoreWindowAgent::WindowIcon:
|
*result = HTSYSMENU;
|
break;
|
case CoreWindowAgent::Help:
|
*result = HTHELP;
|
break;
|
case CoreWindowAgent::Minimize:
|
*result = HTREDUCE;
|
break;
|
case CoreWindowAgent::Maximize:
|
*result = HTZOOM;
|
break;
|
case CoreWindowAgent::Close:
|
*result = HTCLOSE;
|
break;
|
default:
|
break; // unreachable
|
}
|
}
|
if (*result == HTNOWHERE) {
|
// OK, it seems we are not inside the window resize area, nor inside the
|
// chrome buttons, tell Windows we are in the client area to let Qt handle
|
// this event.
|
*result = HTCLIENT;
|
}
|
return true;
|
}
|
// OK, we are not inside any chrome buttons, try to find out which part of the
|
// window are we hitting.
|
|
bool max = IsMaximized(hWnd);
|
bool full = isFullScreen(hWnd);
|
int frameSize = getResizeBorderThickness(hWnd);
|
bool isTop = (nativeLocalPos.y < frameSize);
|
|
if (isWin10OrGreater()) {
|
// This will handle the left, right and bottom parts of the frame
|
// because we didn't change them.
|
LRESULT originalHitTestResult = ::DefWindowProcW(hWnd, WM_NCHITTEST, 0, lParam);
|
if (originalHitTestResult != HTCLIENT) {
|
// Even if the window is not resizable, we still can't return HTCLIENT here
|
// because when we enter this code path, it means the mouse cursor is
|
// outside the window, that is, the three transparent window resize area.
|
// Returning HTCLIENT will confuse Windows, we can't put our controls there
|
// anyway.
|
*result = ((isFixedSize || dontOverrideCursor) ? HTBORDER
|
: originalHitTestResult);
|
return true;
|
}
|
if (full) {
|
*result = HTCLIENT;
|
return true;
|
}
|
if (max) {
|
*result = (isTitleBar ? HTCAPTION : HTCLIENT);
|
return true;
|
}
|
// At this point, we know that the cursor is inside the client area
|
// so it has to be either the little border at the top of our custom
|
// title bar or the drag bar. Apparently, it must be the drag bar or
|
// the little border at the top which the user can use to move or
|
// resize the window.
|
if (isTop) {
|
// Return HTCLIENT instead of HTBORDER here, because the mouse is
|
// inside our homemade title bar now, return HTCLIENT to let our
|
// title bar can still capture mouse events.
|
*result = ((isFixedSize || dontOverrideCursor)
|
? (isTitleBar ? HTCAPTION : HTCLIENT)
|
: HTTOP);
|
return true;
|
}
|
if (isTitleBar) {
|
*result = HTCAPTION;
|
return true;
|
}
|
*result = HTCLIENT;
|
return true;
|
} else {
|
if (full) {
|
*result = HTCLIENT;
|
return true;
|
}
|
if (max) {
|
*result = (isTitleBar ? HTCAPTION : HTCLIENT);
|
return true;
|
}
|
if (!isFixedSize) {
|
const bool isBottom = (nativeLocalPos.y >= (clientHeight - frameSize));
|
// Make the border a little wider to let the user easy to resize on corners.
|
const auto scaleFactor = ((isTop || isBottom) ? qreal(2) : qreal(1));
|
const int scaledFrameSizeX = std::round(qreal(frameSize) * scaleFactor);
|
const bool isLeft = (nativeLocalPos.x < scaledFrameSizeX);
|
const bool isRight = (nativeLocalPos.x >= (clientWidth - scaledFrameSizeX));
|
if (dontOverrideCursor && (isTop || isBottom || isLeft || isRight)) {
|
// Return HTCLIENT instead of HTBORDER here, because the mouse is
|
// inside the window now, return HTCLIENT to let the controls
|
// inside our window can still capture mouse events.
|
*result = (isTitleBar ? HTCAPTION : HTCLIENT);
|
return true;
|
}
|
if (isTop) {
|
if (isLeft) {
|
*result = HTTOPLEFT;
|
return true;
|
}
|
if (isRight) {
|
*result = HTTOPRIGHT;
|
return true;
|
}
|
*result = HTTOP;
|
return true;
|
}
|
if (isBottom) {
|
if (isLeft) {
|
*result = HTBOTTOMLEFT;
|
return true;
|
}
|
if (isRight) {
|
*result = HTBOTTOMRIGHT;
|
return true;
|
}
|
*result = HTBOTTOM;
|
return true;
|
}
|
if (isLeft) {
|
*result = HTLEFT;
|
return true;
|
}
|
if (isRight) {
|
*result = HTRIGHT;
|
return true;
|
}
|
}
|
if (isTitleBar) {
|
*result = HTCAPTION;
|
return true;
|
}
|
*result = HTCLIENT;
|
return true;
|
}
|
}
|
default:
|
break;
|
}
|
if (!isWin10OrGreater()) {
|
switch (message) {
|
case WM_NCUAHDRAWCAPTION:
|
case WM_NCUAHDRAWFRAME: {
|
// These undocumented messages are sent to draw themed window
|
// borders. Block them to prevent drawing borders over the client
|
// area.
|
*result = FALSE;
|
return true;
|
}
|
case WM_NCPAINT: {
|
// 边框阴影处于非客户区的范围，因此如果直接阻止非客户区的绘制，会导致边框阴影丢失
|
|
if (!isDwmCompositionEnabled()) {
|
// Only block WM_NCPAINT when DWM composition is disabled. If
|
// it's blocked when DWM composition is enabled, the frame
|
// shadow won't be drawn.
|
*result = FALSE;
|
return true;
|
} else {
|
break;
|
}
|
}
|
case WM_NCACTIVATE: {
|
if (isDwmCompositionEnabled()) {
|
// DefWindowProc won't repaint the window border if lParam (normally a HRGN)
|
// is -1. See the following link's "lParam" section:
|
// https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-ncactivate
|
// Don't use "*result = 0" here, otherwise the window won't respond to the
|
// window activation state change.
|
*result = ::DefWindowProcW(hWnd, WM_NCACTIVATE, wParam, -1);
|
} else {
|
if (wParam) {
|
*result = FALSE;
|
} else {
|
*result = TRUE;
|
}
|
}
|
return true;
|
}
|
case WM_SETICON:
|
case WM_SETTEXT: {
|
// Disable painting while these messages are handled to prevent them
|
// from drawing a window caption over the client area.
|
const auto oldStyle = static_cast<DWORD>(::GetWindowLongPtrW(hWnd, GWL_STYLE));
|
// Prevent Windows from drawing the default title bar by temporarily
|
// toggling the WS_VISIBLE style.
|
const DWORD newStyle = (oldStyle & ~WS_VISIBLE);
|
::SetWindowLongPtrW(hWnd, GWL_STYLE, static_cast<LONG_PTR>(newStyle));
|
triggerFrameChange(hWnd);
|
const LRESULT originalResult = ::DefWindowProcW(hWnd, message, wParam, lParam);
|
::SetWindowLongPtrW(hWnd, GWL_STYLE, static_cast<LONG_PTR>(oldStyle));
|
triggerFrameChange(hWnd);
|
*result = originalResult;
|
return true;
|
}
|
default:
|
break;
|
}
|
}
|
return false;
|
}
|
|
bool Win32WindowContext::nonClientCalcSizeHandler(HWND hWnd, UINT message, WPARAM wParam,
|
LPARAM lParam, LRESULT *result) {
|
Q_UNUSED(message)
|
Q_UNUSED(this)
|
|
// Windows是根据这个消息的返回值来设置窗口的客户区（窗口中真正显示的内容）
|
// 和非客户区（标题栏、窗口边框、菜单栏和状态栏等Windows系统自行提供的部分
|
// ，不过对于Qt来说，除了标题栏和窗口边框，非客户区基本也都是自绘的）的范
|
// 围的，lParam里存放的就是新客户区的几何区域，默认是整个窗口的大小，正常
|
// 的程序需要修改这个参数，告知系统窗口的客户区和非客户区的范围（一般来说可
|
// 以完全交给Windows，让其自行处理，使用默认的客户区和非客户区），因此如果
|
// 我们不修改lParam，就可以使客户区充满整个窗口，从而去掉标题栏和窗口边框
|
// （因为这些东西都被客户区给盖住了。但边框阴影也会因此而丢失，不过我们会使
|
// 用其他方式将其带回，请参考其他消息的处理，此处不过多提及）。但有个情况要
|
// 特别注意，那就是窗口最大化后，窗口的实际尺寸会比屏幕的尺寸大一点，从而使
|
// 用户看不到窗口的边界，这样用户就不能在窗口最大化后调整窗口的大小了（虽然
|
// 这个做法听起来特别奇怪，但Windows确实就是这样做的），因此如果我们要自行
|
// 处理窗口的非客户区，就要在窗口最大化后，将窗口边框的宽度和高度（一般是相
|
// 等的）从客户区裁剪掉，否则我们窗口所显示的内容就会超出屏幕边界，显示不全。
|
// 如果用户开启了任务栏自动隐藏，在窗口最大化后，还要考虑任务栏的位置。因为
|
// 如果窗口最大化后，其尺寸和屏幕尺寸相等（因为任务栏隐藏了，所以窗口最大化
|
// 后其实是充满了整个屏幕，变相的全屏了），Windows会认为窗口已经进入全屏的
|
// 状态，从而导致自动隐藏的任务栏无法弹出。要避免这个状况，就要使窗口的尺寸
|
// 小于屏幕尺寸。我下面的做法参考了火狐、Chromium和Windows Terminal
|
// 如果没有开启任务栏自动隐藏，是不存在这个问题的，所以要先进行判断。
|
// 一般情况下，*result设置为0（相当于DefWindowProc的返回值为0）就可以了，
|
// 根据MSDN的说法，返回0意为此消息已经被程序自行处理了，让Windows跳过此消
|
// 息，否则Windows会添加对此消息的默认处理，对于当前这个消息而言，就意味着
|
// 标题栏和窗口边框又会回来，这当然不是我们想要的结果。根据MSDN，当wParam
|
// 为FALSE时，只能返回0，但当其为TRUE时，可以返回0，也可以返回一个WVR_常
|
// 量。根据Chromium的注释，当存在非客户区时，如果返回WVR_REDRAW会导致子
|
// 窗口/子控件出现奇怪的bug（自绘控件错位），并且Lucas在Windows 10
|
// 上成功复现，说明这个bug至今都没有解决。我查阅了大量资料，发现唯一的解决
|
// 方案就是返回0。但如果不存在非客户区，且wParam为TRUE，最好返回
|
// WVR_REDRAW，否则窗口在调整大小可能会产生严重的闪烁现象。
|
// 虽然对大多数消息来说，返回0都代表让Windows忽略此消息，但实际上不同消息
|
// 能接受的返回值是不一样的，请注意自行查阅MSDN。
|
|
// Sent when the size and position of a window's client area must be
|
// calculated. By processing this message, an application can
|
// control the content of the window's client area when the size or
|
// position of the window changes. If wParam is TRUE, lParam points
|
// to an NCCALCSIZE_PARAMS structure that contains information an
|
// application can use to calculate the new size and position of the
|
// client rectangle. If wParam is FALSE, lParam points to a RECT
|
// structure. On entry, the structure contains the proposed window
|
// rectangle for the window. On exit, the structure should contain
|
// the screen coordinates of the corresponding window client area.
|
// The client area is the window's content area, the non-client area
|
// is the area which is provided by the system, such as the title
|
// bar, the four window borders, the frame shadow, the menu bar, the
|
// status bar, the scroll bar, etc. But for Qt, it draws most of the
|
// window area (client + non-client) itself. We now know that the
|
// title bar and the window frame is in the non-client area, and we
|
// can set the scope of the client area in this message, so we can
|
// remove the title bar and the window frame by let the non-client
|
// area be covered by the client area (because we can't really get
|
// rid of the non-client area, it will always be there, all we can
|
// do is to hide it) , which means we should let the client area's
|
// size the same with the whole window's size. So there is no room
|
// for the non-client area and then the user won't be able to see it
|
// again. But how to achieve this? Very easy, just leave lParam (the
|
// re-calculated client area) untouched. But of course you can
|
// modify lParam, then the non-client area will be seen and the
|
// window borders and the window frame will show up. However, things
|
// are quite different when you try to modify the top margin of the
|
// client area. DWM will always draw the whole title bar no matter
|
// what margin value you set for the top, unless you don't modify it
|
// and remove the whole top area (the title bar + the one pixel
|
// height window border). This can be confirmed in Windows
|
// Terminal's source code, you can also try yourself to verify
|
// it. So things will become quite complicated if you want to
|
// preserve the four window borders.
|
|
// If `wParam` is `FALSE`, `lParam` points to a `RECT` that contains
|
// the proposed window rectangle for our window. During our
|
// processing of the `WM_NCCALCSIZE` message, we are expected to
|
// modify the `RECT` that `lParam` points to, so that its value upon
|
// our return is the new client area. We must return 0 if `wParam`
|
// is `FALSE`.
|
// If `wParam` is `TRUE`, `lParam` points to a `NCCALCSIZE_PARAMS`
|
// struct. This struct contains an array of 3 `RECT`s, the first of
|
// which has the exact same meaning as the `RECT` that is pointed to
|
// by `lParam` when `wParam` is `FALSE`. The remaining `RECT`s, in
|
// conjunction with our return value, can
|
// be used to specify portions of the source and destination window
|
// rectangles that are valid and should be preserved. We opt not to
|
// implement an elaborate client-area preservation technique, and
|
// simply return 0, which means "preserve the entire old client area
|
// and align it with the upper-left corner of our new client area".
|
const auto clientRect = wParam ? &(reinterpret_cast<LPNCCALCSIZE_PARAMS>(lParam))->rgrc[0]
|
: reinterpret_cast<LPRECT>(lParam);
|
if (isWin10OrGreater()) {
|
// Store the original top margin before the default window procedure applies the
|
// default frame.
|
const LONG originalTop = clientRect->top;
|
// Apply the default frame because we don't want to remove the whole window
|
// frame, we still need the standard window frame (the resizable frame border
|
// and the frame shadow) for the left, bottom and right edges. If we return 0
|
// here directly, the whole window frame will be removed (which means there will
|
// be no resizable frame border and the frame shadow will also disappear), and
|
// that's also how most applications customize their title bars on Windows. It's
|
// totally OK but since we want to preserve as much original frame as possible,
|
// we can't use that solution.
|
const LRESULT hitTestResult = ::DefWindowProcW(hWnd, WM_NCCALCSIZE, wParam, lParam);
|
if ((hitTestResult != HTERROR) && (hitTestResult != HTNOWHERE)) {
|
*result = hitTestResult;
|
return true;
|
}
|
// Re-apply the original top from before the size of the default frame was
|
// applied, and the whole top frame (the title bar and the top border) is gone
|
// now. For the top frame, we only has 2 choices: (1) remove the top frame
|
// entirely, or (2) don't touch it at all. We can't preserve the top border by
|
// adjusting the top margin here. If we try to modify the top margin, the
|
// original title bar will always be painted by DWM regardless what margin we
|
// set, so here we can only remove the top frame entirely and use some special
|
// technique to bring the top border back.
|
clientRect->top = originalTop;
|
}
|
const bool max = IsMaximized(hWnd);
|
const bool full = isFullScreen(hWnd);
|
// We don't need this correction when we're fullscreen. We will
|
// have the WS_POPUP size, so we don't have to worry about
|
// borders, and the default frame will be fine.
|
if (max && !full) {
|
// When a window is maximized, its size is actually a little bit more
|
// than the monitor's work area. The window is positioned and sized in
|
// such a way that the resize handles are outside the monitor and
|
// then the window is clipped to the monitor so that the resize handle
|
// do not appear because you don't need them (because you can't resize
|
// a window when it's maximized unless you restore it).
|
const quint32 frameSize = getResizeBorderThickness(hWnd);
|
clientRect->top += frameSize;
|
if (!isWin10OrGreater()) {
|
clientRect->bottom -= frameSize;
|
clientRect->left += frameSize;
|
clientRect->right -= frameSize;
|
}
|
}
|
// Attempt to detect if there's an autohide taskbar, and if
|
// there is, reduce our size a bit on the side with the taskbar,
|
// so the user can still mouse-over the taskbar to reveal it.
|
// Make sure to use MONITOR_DEFAULTTONEAREST, so that this will
|
// still find the right monitor even when we're restoring from
|
// minimized.
|
if (max || full) {
|
APPBARDATA abd{};
|
abd.cbSize = sizeof(abd);
|
const UINT taskbarState = ::SHAppBarMessage(ABM_GETSTATE, &abd);
|
// First, check if we have an auto-hide taskbar at all:
|
if (taskbarState & ABS_AUTOHIDE) {
|
bool top = false, bottom = false, left = false, right = false;
|
// Due to ABM_GETAUTOHIDEBAREX was introduced in Windows 8.1,
|
// we have to use another way to judge this if we are running
|
// on Windows 7 or Windows 8.
|
if (isWin8Point1OrGreater()) {
|
const RECT monitorRect = getMonitorForWindow(hWnd).rcMonitor;
|
// This helper can be used to determine if there's an
|
// auto-hide taskbar on the given edge of the monitor
|
// we're currently on.
|
const auto hasAutohideTaskbar = [monitorRect](const UINT edge) -> bool {
|
APPBARDATA abd2{};
|
abd2.cbSize = sizeof(abd2);
|
abd2.uEdge = edge;
|
abd2.rc = monitorRect;
|
const auto hTaskbar =
|
reinterpret_cast<HWND>(::SHAppBarMessage(ABM_GETAUTOHIDEBAREX, &abd2));
|
return (hTaskbar != nullptr);
|
};
|
top = hasAutohideTaskbar(ABE_TOP);
|
bottom = hasAutohideTaskbar(ABE_BOTTOM);
|
left = hasAutohideTaskbar(ABE_LEFT);
|
right = hasAutohideTaskbar(ABE_RIGHT);
|
} else {
|
int edge = -1;
|
APPBARDATA abd2{};
|
abd2.cbSize = sizeof(abd2);
|
abd2.hWnd = ::FindWindowW(L"Shell_TrayWnd", nullptr);
|
HMONITOR windowMonitor = ::MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);
|
HMONITOR taskbarMonitor =
|
::MonitorFromWindow(abd2.hWnd, MONITOR_DEFAULTTOPRIMARY);
|
if (taskbarMonitor == windowMonitor) {
|
::SHAppBarMessage(ABM_GETTASKBARPOS, &abd2);
|
edge = int(abd2.uEdge);
|
}
|
top = (edge == ABE_TOP);
|
bottom = (edge == ABE_BOTTOM);
|
left = (edge == ABE_LEFT);
|
right = (edge == ABE_RIGHT);
|
}
|
// If there's a taskbar on any side of the monitor, reduce
|
// our size a little bit on that edge.
|
// Note to future code archeologists:
|
// This doesn't seem to work for fullscreen on the primary
|
// display. However, testing a bunch of other apps with
|
// fullscreen modes and an auto-hiding taskbar has
|
// shown that _none_ of them reveal the taskbar from
|
// fullscreen mode. This includes Edge, Firefox, Chrome,
|
// Sublime Text, PowerPoint - none seemed to support this.
|
// This does however work fine for maximized.
|
if (top) {
|
// Peculiarly, when we're fullscreen,
|
clientRect->top += kAutoHideTaskBarThickness;
|
} else if (bottom) {
|
clientRect->bottom -= kAutoHideTaskBarThickness;
|
} else if (left) {
|
clientRect->left += kAutoHideTaskBarThickness;
|
} else if (right) {
|
clientRect->right -= kAutoHideTaskBarThickness;
|
}
|
}
|
}
|
// We should call this function only before the function returns.
|
syncPaintEventWithDwm();
|
// By returning WVR_REDRAW we can make the window resizing look
|
// less broken. But we must return 0 if wParam is FALSE, according to Microsoft
|
// Docs.
|
// **IMPORTANT NOTE**:
|
// If you are drawing something manually through D3D in your window, don't
|
// try to return WVR_REDRAW here, otherwise Windows exhibits bugs where
|
// client pixels and child windows are mispositioned by the width/height
|
// of the upper-left non-client area. It's confirmed that this issue exists
|
// from Windows 7 to Windows 10. Not tested on Windows 11 yet. Don't know
|
// whether it exists on Windows XP to Windows Vista or not.
|
*result = wParam ? WVR_REDRAW : FALSE;
|
return true;
|
}
|
|
bool Win32WindowContext::systemMenuHandler(HWND hWnd, UINT message, WPARAM wParam,
|
LPARAM lParam, LRESULT *result) {
|
const auto getNativePosFromMouse = [lParam]() -> POINT {
|
return {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
|
};
|
const auto getNativeGlobalPosFromKeyboard = [hWnd]() -> POINT {
|
const bool maxOrFull = IsMaximized(hWnd) || isFullScreen(hWnd);
|
const quint32 frameSize = getResizeBorderThickness(hWnd);
|
const quint32 horizontalOffset = ((maxOrFull || !isWin10OrGreater()) ? 0 : frameSize);
|
const auto verticalOffset = [hWnd, maxOrFull, frameSize]() -> quint32 {
|
const quint32 titleBarHeight = getTitleBarHeight(hWnd);
|
if (!isWin10OrGreater()) {
|
return titleBarHeight;
|
}
|
if (isWin11OrGreater()) {
|
if (maxOrFull) {
|
return (titleBarHeight + frameSize);
|
}
|
return titleBarHeight;
|
}
|
if (maxOrFull) {
|
return titleBarHeight;
|
}
|
return titleBarHeight - frameSize;
|
}();
|
RECT windowPos{};
|
::GetWindowRect(hWnd, &windowPos);
|
return {static_cast<LONG>(windowPos.left + horizontalOffset), static_cast<LONG>(windowPos.top + verticalOffset)};
|
};
|
bool shouldShowSystemMenu = false;
|
bool broughtByKeyboard = false;
|
POINT nativeGlobalPos{};
|
switch (message) {
|
case WM_RBUTTONUP: {
|
const POINT nativeLocalPos = getNativePosFromMouse();
|
const QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(QPoint(nativeLocalPos.x, nativeLocalPos.y), m_windowHandle);
|
if (isInTitleBarDraggableArea(qtScenePos)) {
|
shouldShowSystemMenu = true;
|
nativeGlobalPos = nativeLocalPos;
|
::ClientToScreen(hWnd, &nativeGlobalPos);
|
}
|
break;
|
}
|
case WM_NCRBUTTONUP: {
|
if (wParam == HTCAPTION) {
|
shouldShowSystemMenu = true;
|
nativeGlobalPos = getNativePosFromMouse();
|
}
|
break;
|
}
|
case WM_SYSCOMMAND: {
|
const WPARAM filteredWParam = (wParam & 0xFFF0);
|
if ((filteredWParam == SC_KEYMENU) && (lParam == VK_SPACE)) {
|
shouldShowSystemMenu = true;
|
broughtByKeyboard = true;
|
nativeGlobalPos = getNativeGlobalPosFromKeyboard();
|
}
|
break;
|
}
|
case WM_KEYDOWN:
|
case WM_SYSKEYDOWN: {
|
const bool altPressed = ((wParam == VK_MENU) || (::GetKeyState(VK_MENU) < 0));
|
const bool spacePressed = ((wParam == VK_SPACE) || (::GetKeyState(VK_SPACE) < 0));
|
if (altPressed && spacePressed) {
|
shouldShowSystemMenu = true;
|
broughtByKeyboard = true;
|
nativeGlobalPos = getNativeGlobalPosFromKeyboard();
|
}
|
break;
|
}
|
default:
|
break;
|
}
|
if (shouldShowSystemMenu) {
|
showSystemMenu2(hWnd, nativeGlobalPos, broughtByKeyboard);
|
// QPA's internal code will handle system menu events separately, and its
|
// behavior is not what we would want to see because it doesn't know our
|
// window doesn't have any window frame now, so return early here to avoid
|
// entering Qt's own handling logic.
|
*result = FALSE;
|
return true;
|
}
|
return false;
|
}
|
|
}
|
