#include "win32windowcontext_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/QCoreApplication>
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#include <QtCore/QOperatingSystemVersion>
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#include <QtCore/private/qsystemlibrary_p.h>
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#include <QtGui/private/qhighdpiscaling_p.h>
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#include "qwkcoreglobal_p.h"
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#include <shellscalingapi.h>
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#include <dwmapi.h>
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namespace QWK {
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static constexpr const auto kAutoHideTaskBarThickness = quint8{ 2 }; // The thickness of an auto-hide taskbar in pixels.
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using WndProcHash = QHash<HWND, Win32WindowContext *>; // hWnd -> context
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Q_GLOBAL_STATIC(WndProcHash, g_wndProcHash);
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static WNDPROC g_qtWindowProc = nullptr; // Original Qt window proc function
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struct DynamicApis {
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decltype(&::DwmFlush) pDwmFlush = nullptr;
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decltype(&::GetDpiForWindow) pGetDpiForWindow = nullptr;
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decltype(&::GetSystemMetricsForDpi) pGetSystemMetricsForDpi = nullptr;
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decltype(&::GetDpiForMonitor) pGetDpiForMonitor = nullptr;
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DynamicApis() {
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QSystemLibrary user32(QStringLiteral("user32.dll"));
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pGetDpiForWindow = reinterpret_cast<decltype(pGetDpiForWindow)>(user32.resolve("GetDpiForWindow"));
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pGetSystemMetricsForDpi = reinterpret_cast<decltype(pGetSystemMetricsForDpi)>(user32.resolve("GetSystemMetricsForDpi"));
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QSystemLibrary shcore(QStringLiteral("shcore.dll"));
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pGetDpiForMonitor = reinterpret_cast<decltype(pGetDpiForMonitor)>(shcore.resolve("GetDpiForMonitor"));
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QSystemLibrary dwmapi(QStringLiteral("dwmapi.dll"));
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pDwmFlush = reinterpret_cast<decltype(pDwmFlush)>(dwmapi.resolve("DwmFlush"));
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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return ((lhs.left == rhs.left) && (lhs.top == rhs.top) && (lhs.right == rhs.right) && (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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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return QRect{ QPoint{ int(rect.left), int(rect.top) }, QSize{ int(RECT_WIDTH(rect)), int(RECT_HEIGHT(rect)) } };
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}
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static inline constexpr RECT qrect2rect(const QRect &qrect)
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{
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return RECT{ LONG(qrect.left()), LONG(qrect.top()), LONG(qrect.right()), LONG(qrect.bottom()) };
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}
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static inline /*constexpr*/ QString hwnd2str(const WId windowId)
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{
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// NULL handle is allowed here.
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return QLatin1String("0x") + QString::number(windowId, 16).toUpper().rightJustified(8, u'0');
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}
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static inline /*constexpr*/ QString hwnd2str(const HWND hwnd)
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{
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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 isWin8Point1OrGreater() {
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static const bool result = QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows8_1;
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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 = QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10;
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return result;
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}
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static inline quint32 getDpiForWindow(const HWND hwnd) {
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Q_ASSERT(hwnd);
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if (!hwnd) {
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return USER_DEFAULT_SCREEN_DPI;
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}
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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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const HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
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UINT dpiX{ USER_DEFAULT_SCREEN_DPI };
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UINT dpiY{ USER_DEFAULT_SCREEN_DPI };
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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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const 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(const HWND hwnd) {
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Q_ASSERT(hwnd);
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if (!hwnd) {
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return 0;
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}
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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) + 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 std::optional<MONITORINFOEXW> getMonitorForWindow(const HWND hwnd)
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{
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Q_ASSERT(hwnd);
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if (!hwnd) {
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return std::nullopt;
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}
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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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const 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 bool isFullScreen(const HWND hwnd) {
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Q_ASSERT(hwnd);
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if (!hwnd) {
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return false;
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}
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RECT windowRect{};
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::GetWindowRect(hwnd, &windowRect);
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const std::optional<MONITORINFOEXW> mi = getMonitorForWindow(hwnd);
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// Compare to the full area of the screen, not the work area.
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return (windowRect == mi.value_or(MONITORINFOEXW{}).rcMonitor);
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}
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static inline QPoint fromNativeLocalPosition(const QWindow *window, const QPoint &point) {
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Q_ASSERT(window);
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if (!window) {
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return point;
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}
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#if 1
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return QHighDpi::fromNativeLocalPosition(point, window);
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#else
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return QPointF(QPointF(point) / window->devicePixelRatio()).toPoint();
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#endif
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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:
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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:
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return Win32WindowContext::FixedBorder;
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default:
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break;
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}
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return Win32WindowContext::Outside;
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}
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static bool isValidWindow(WId windowId, bool checkVisible, bool checkTopLevel) {
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const auto hwnd = reinterpret_cast<HWND>(windowId);
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if (::IsWindow(hwnd) == FALSE) {
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return false;
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}
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const LONG_PTR styles = ::GetWindowLongPtrW(hwnd, GWL_STYLE);
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if (styles & WS_DISABLED) {
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return false;
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}
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const LONG_PTR exStyles = ::GetWindowLongPtrW(hwnd, GWL_EXSTYLE);
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if (exStyles & WS_EX_TOOLWINDOW) {
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return false;
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}
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RECT rect = {0, 0, 0, 0};
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if (::GetWindowRect(hwnd, &rect) == FALSE) {
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return false;
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}
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if ((rect.left >= rect.right) || (rect.top >= rect.bottom)) {
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return false;
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}
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if (checkVisible) {
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if (::IsWindowVisible(hwnd) == FALSE) {
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return false;
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}
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}
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if (checkTopLevel) {
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if (::GetAncestor(hwnd, GA_ROOT) != hwnd) {
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return false;
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}
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}
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return true;
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}
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// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1556
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// In QWindowsContext::windowsProc(), the messages will be passed to all global native event
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// filters, but because we have already filtered the messages in the hook WndProc function for
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// convenience, Qt does not know we may have already process the messages and thus will call
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// DefWindowProc(). Consequently, we have to add a global native filter that forwards the result
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// of the hook function, telling Qt whether we have filtered the events before. Since Qt only
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// handles Windows window messages in the main thread, it is safe to do so.
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class WindowsNativeEventFilter : public QAbstractNativeEventFilter {
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public:
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bool nativeEventFilter(const QByteArray &eventType, void *message,
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QT_NATIVE_EVENT_RESULT_TYPE *result) override {
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// It has been observed that the pointer that Qt gives us is sometimes null on some machines.
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// We need to guard against it in such scenarios.
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if (!result) {
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return false;
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}
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if (lastMessageHandled) {
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*result = static_cast<QT_NATIVE_EVENT_RESULT_TYPE>(lastMessageResult);
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return true;
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}
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return false;
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}
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static bool lastMessageHandled;
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static LRESULT lastMessageResult;
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static WindowsNativeEventFilter *instance;
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static inline void install() {
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instance = new WindowsNativeEventFilter();
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qApp->installNativeEventFilter(instance);
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}
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static inline void uninstall() {
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qApp->removeNativeEventFilter(instance);
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delete instance;
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instance = nullptr;
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}
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};
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bool WindowsNativeEventFilter::lastMessageHandled = false;
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LRESULT WindowsNativeEventFilter::lastMessageResult = 0;
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WindowsNativeEventFilter *WindowsNativeEventFilter::instance = nullptr;
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// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1025
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// We can see from the source code that Qt will filter out some messages first and then send the
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// unfiltered messages to the event dispatcher. To activate the Snap Layout feature on Windows
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// 11, we must process some non-client area messages ourselves, but unfortunately these messages
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// have been filtered out already in that line, and thus we'll never have the chance to process
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// them ourselves. This is Qt's low level platform specific code, so we don't have any official
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// ways to change this behavior. But luckily we can replace the window procedure function of
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// Qt's windows, and in this hooked window procedure function, we finally have the chance to
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// process window messages before Qt touches them. So we reconstruct the MSG structure and send
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// it to our own custom native event filter to do all the magic works. But since the system menu
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// feature doesn't necessarily belong to the native implementation, we seperate the handling
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// code and always process the system menu part in this function for both implementations.
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//
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// Original event flow:
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// [Entry] Windows Message Queue
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// |
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// [Qt Window Proc] qwindowscontext.cpp#L1547: qWindowsWndProc()
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// ```
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// const bool handled = QWindowsContext::instance()->windowsProc
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// (hwnd, message, et, wParam, lParam, &result,
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// &platformWindow);
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// ```
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// |
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// [Non-Input Filter] qwindowscontext.cpp#L1025: QWindowsContext::windowsProc()
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// ```
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// if (!isInputMessage(msg.message) &&
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// filterNativeEvent(&msg, result))
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// return true;
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// ```
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// |
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// [User Filter] qwindowscontext.cpp#L1588: QWindowsContext::windowsProc()
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// ```
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// QAbstractEventDispatcher *dispatcher =
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// QAbstractEventDispatcher::instance();
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// qintptr filterResult = 0;
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// if (dispatcher &&
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// dispatcher->filterNativeEvent(nativeEventType(), msg,
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// &filterResult)) {
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// *result = LRESULT(filterResult);
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// return true;
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// }
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// ```
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// |
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// [Extra work] The rest of QWindowsContext::windowsProc() and qWindowsWndProc()
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//
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// Notice: Only non-input messages will be processed by the user-defined global native event
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// filter!!! These events are then passed to the widget class's own overridden
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// QWidget::nativeEvent() as a local filter, where all native events can be handled, but we must
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// create a new class derived from QWidget which we don't intend to. Therefore, we don't expect
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// to process events from the global native event filter, but instead hook Qt's window
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// procedure.
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extern "C" LRESULT QT_WIN_CALLBACK QWKHookedWndProc(HWND hWnd, UINT message, WPARAM wParam,
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LPARAM lParam) {
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Q_ASSERT(hWnd);
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if (!hWnd) {
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return FALSE;
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}
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// Search window context
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auto ctx = g_wndProcHash->value(hWnd);
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if (!ctx) {
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return ::DefWindowProcW(hWnd, message, wParam, lParam);
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}
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// Try hooked procedure and save result
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auto &handled = WindowsNativeEventFilter::lastMessageHandled;
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auto &result = WindowsNativeEventFilter::lastMessageResult;
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handled = ctx->windowProc(hWnd, message, wParam, lParam, &result);
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// TODO: Determine whether to show system menu
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// ...
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// Since Qt does the necessary processing of the message afterward, we still need to
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// continue dispatching it.
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return ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
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}
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Win32WindowContext::Win32WindowContext(QWindow *window, WindowItemDelegate *delegate)
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: AbstractWindowContext(window, delegate) {
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}
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Win32WindowContext::~Win32WindowContext() {
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// Remove window handle mapping
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if (auto hWnd = reinterpret_cast<HWND>(windowId); hWnd) {
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g_wndProcHash->remove(hWnd);
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// Remove event filter if the all windows has been destroyed
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if (g_wndProcHash->empty()) {
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WindowsNativeEventFilter::uninstall();
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}
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}
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}
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bool Win32WindowContext::setup() {
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auto winId = m_windowHandle->winId();
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// Install window hook
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auto hWnd = reinterpret_cast<HWND>(winId);
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// Store original window proc
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if (!g_qtWindowProc) {
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g_qtWindowProc = reinterpret_cast<WNDPROC>(::GetWindowLongPtrW(hWnd, GWLP_WNDPROC));
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}
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// Hook window proc
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::SetWindowLongPtrW(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(QWKHookedWndProc));
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// Install global native event filter
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if (!WindowsNativeEventFilter::instance) {
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WindowsNativeEventFilter::install();
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}
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// Cache window ID
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windowId = winId;
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// Save window handle mapping
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g_wndProcHash->insert(hWnd, this);
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return true;
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}
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bool Win32WindowContext::windowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam,
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LRESULT *result) {
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*result = FALSE;
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// We should skip these messages otherwise we will get crashes.
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// NOTE: WM_QUIT won't be posted to the WindowProc function.
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switch (message) {
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case WM_CLOSE:
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case WM_DESTROY:
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case WM_NCDESTROY:
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// Undocumented messages:
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case WM_UAHDESTROYWINDOW:
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case WM_UNREGISTER_WINDOW_SERVICES:
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return false;
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default:
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break;
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}
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if (!isValidWindow(windowId, false, true)) {
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return false;
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}
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// Test snap layout
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if (snapLayoutHandler(hWnd, message, wParam, lParam, result)) {
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return true;
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}
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// Main implementation
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if (customWindowHandler(hWnd, message, wParam, lParam, result)) {
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return true;
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}
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return false; // Not handled
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}
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static constexpr const auto kMessageTag = WPARAM(0x97CCEA99);
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static inline constexpr bool isTaggedMessage(WPARAM wParam) {
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return (wParam == kMessageTag);
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}
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static inline quint64 getKeyState() {
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quint64 result = 0;
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const auto &get = [](const int virtualKey) -> bool {
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return (::GetAsyncKeyState(virtualKey) < 0);
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};
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const bool buttonSwapped = (::GetSystemMetrics(SM_SWAPBUTTON) != FALSE);
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if (get(VK_LBUTTON)) {
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result |= (buttonSwapped ? MK_RBUTTON : MK_LBUTTON);
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}
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if (get(VK_RBUTTON)) {
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result |= (buttonSwapped ? MK_LBUTTON : MK_RBUTTON);
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}
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if (get(VK_SHIFT)) {
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result |= MK_SHIFT;
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}
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if (get(VK_CONTROL)) {
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result |= MK_CONTROL;
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}
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if (get(VK_MBUTTON)) {
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result |= MK_MBUTTON;
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}
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if (get(VK_XBUTTON1)) {
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result |= MK_XBUTTON1;
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}
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if (get(VK_XBUTTON2)) {
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result |= MK_XBUTTON2;
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}
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return result;
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}
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static void emulateClientAreaMessage(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam,
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const std::optional<int> &overrideMessage = std::nullopt) {
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const int myMsg = overrideMessage.value_or(message);
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const auto wParamNew = [myMsg, wParam]() -> WPARAM {
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if (myMsg == WM_NCMOUSELEAVE) {
|
// wParam is always ignored in mouse leave messages, but here we
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// give them a special tag to be able to distinguish which messages
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// are sent by ourselves.
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return kMessageTag;
|
}
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const quint64 keyState = getKeyState();
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if ((myMsg >= WM_NCXBUTTONDOWN) && (myMsg <= WM_NCXBUTTONDBLCLK)) {
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const auto xButtonMask = GET_XBUTTON_WPARAM(wParam);
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return MAKEWPARAM(keyState, xButtonMask);
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}
|
return keyState;
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}();
|
const auto lParamNew = [myMsg, lParam, hWnd]() -> LPARAM {
|
if (myMsg == WM_NCMOUSELEAVE) {
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// lParam is always ignored in mouse leave messages.
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return 0;
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}
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const auto screenPos = POINT{GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
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POINT clientPos = screenPos;
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::ScreenToClient(hWnd, &clientPos);
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return MAKELPARAM(clientPos.x, clientPos.y);
|
}();
|
#if 0
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# define SEND_MESSAGE ::SendMessageW
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#else
|
# define SEND_MESSAGE ::PostMessageW
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#endif
|
switch (myMsg) {
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case WM_NCHITTEST: // Treat hit test messages as mouse move events.
|
case WM_NCMOUSEMOVE:
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SEND_MESSAGE(hWnd, WM_MOUSEMOVE, wParamNew, lParamNew);
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break;
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case WM_NCLBUTTONDOWN:
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SEND_MESSAGE(hWnd, WM_LBUTTONDOWN, wParamNew, lParamNew);
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break;
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case WM_NCLBUTTONUP:
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SEND_MESSAGE(hWnd, WM_LBUTTONUP, wParamNew, lParamNew);
|
break;
|
case WM_NCLBUTTONDBLCLK:
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SEND_MESSAGE(hWnd, WM_LBUTTONDBLCLK, wParamNew, lParamNew);
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break;
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case WM_NCRBUTTONDOWN:
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SEND_MESSAGE(hWnd, WM_RBUTTONDOWN, wParamNew, lParamNew);
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break;
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case WM_NCRBUTTONUP:
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SEND_MESSAGE(hWnd, WM_RBUTTONUP, wParamNew, lParamNew);
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break;
|
case WM_NCRBUTTONDBLCLK:
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SEND_MESSAGE(hWnd, WM_RBUTTONDBLCLK, wParamNew, lParamNew);
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break;
|
case WM_NCMBUTTONDOWN:
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SEND_MESSAGE(hWnd, WM_MBUTTONDOWN, wParamNew, lParamNew);
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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();
|
QPoint qtScenePos =
|
fromNativeLocalPosition(m_windowHandle, QPoint(GET_X_LPARAM(dwScreenPos),
|
GET_Y_LPARAM(dwScreenPos)));
|
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) {
|
std::ignore = 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.
|
std::ignore = 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_NCCALCSIZE: {
|
// 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 == FALSE) ? reinterpret_cast<LPRECT>(lParam) : &(reinterpret_cast<LPNCCALCSIZE_PARAMS>(lParam))->rgrc[0]);
|
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;
|
SecureZeroMemory(&abd, sizeof(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 std::optional<MONITORINFOEXW> monitorInfo = getMonitorForWindow(hWnd);
|
const RECT monitorRect = monitorInfo.value().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);
|
const HMONITOR windowMonitor = ::MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);
|
const HMONITOR taskbarMonitor = ::MonitorFromWindow(abd2.hWnd, MONITOR_DEFAULTTOPRIMARY);
|
if (taskbarMonitor == windowMonitor) {
|
::SHAppBarMessage(ABM_GETTASKBARPOS, &abd2);
|
edge = 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;
|
}
|
}
|
}
|
// ### TODO: std::ignore = Utils::syncWmPaintWithDwm(); // This should be executed at the very last.
|
// 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 == FALSE ? FALSE : WVR_REDRAW;
|
return true;
|
}
|
default:
|
break;
|
}
|
return false;
|
}
|
|
}
|
