From 0e9c2e428fb61953fd8f152125897646fe6fd337 Mon Sep 17 00:00:00 2001
From: Yuhang Zhao <zhaoyuhang@rankyee.com>
Date: ćšć, 21 12æ 2023 16:44:30 +0800
Subject: [PATCH] add mica mica alt acrylic
---
src/core/contexts/win32windowcontext.cpp | 383 ++++++++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 354 insertions(+), 29 deletions(-)
diff --git a/src/core/contexts/win32windowcontext.cpp b/src/core/contexts/win32windowcontext.cpp
index 2a6ee76..76510ee 100644
--- a/src/core/contexts/win32windowcontext.cpp
+++ b/src/core/contexts/win32windowcontext.cpp
@@ -62,6 +62,82 @@
_DWMWA_MICA_EFFECT = 1029
};
+ // Types used with DWMWA_SYSTEMBACKDROP_TYPE
+ enum _DWM_SYSTEMBACKDROP_TYPE {
+ _DWMSBT_AUTO, // [Default] Let DWM automatically decide the system-drawn backdrop for this window.
+ _DWMSBT_NONE, // [Disable] Do not draw any system backdrop.
+ _DWMSBT_MAINWINDOW, // [Mica] Draw the backdrop material effect corresponding to a long-lived window.
+ _DWMSBT_TRANSIENTWINDOW, // [Acrylic] Draw the backdrop material effect corresponding to a transient window.
+ _DWMSBT_TABBEDWINDOW, // [Mica Alt] Draw the backdrop material effect corresponding to a window with a tabbed title bar.
+ };
+
+ enum WINDOWCOMPOSITIONATTRIB {
+ WCA_UNDEFINED = 0,
+ WCA_NCRENDERING_ENABLED = 1,
+ WCA_NCRENDERING_POLICY = 2,
+ WCA_TRANSITIONS_FORCEDISABLED = 3,
+ WCA_ALLOW_NCPAINT = 4,
+ WCA_CAPTION_BUTTON_BOUNDS = 5,
+ WCA_NONCLIENT_RTL_LAYOUT = 6,
+ WCA_FORCE_ICONIC_REPRESENTATION = 7,
+ WCA_EXTENDED_FRAME_BOUNDS = 8,
+ WCA_HAS_ICONIC_BITMAP = 9,
+ WCA_THEME_ATTRIBUTES = 10,
+ WCA_NCRENDERING_EXILED = 11,
+ WCA_NCADORNMENTINFO = 12,
+ WCA_EXCLUDED_FROM_LIVEPREVIEW = 13,
+ WCA_VIDEO_OVERLAY_ACTIVE = 14,
+ WCA_FORCE_ACTIVEWINDOW_APPEARANCE = 15,
+ WCA_DISALLOW_PEEK = 16,
+ WCA_CLOAK = 17,
+ WCA_CLOAKED = 18,
+ WCA_ACCENT_POLICY = 19,
+ WCA_FREEZE_REPRESENTATION = 20,
+ WCA_EVER_UNCLOAKED = 21,
+ WCA_VISUAL_OWNER = 22,
+ WCA_HOLOGRAPHIC = 23,
+ WCA_EXCLUDED_FROM_DDA = 24,
+ WCA_PASSIVEUPDATEMODE = 25,
+ WCA_USEDARKMODECOLORS = 26,
+ WCA_CORNER_STYLE = 27,
+ WCA_PART_COLOR = 28,
+ WCA_DISABLE_MOVESIZE_FEEDBACK = 29,
+ WCA_LAST = 30
+ };
+
+ enum ACCENT_STATE {
+ ACCENT_DISABLED = 0,
+ ACCENT_ENABLE_GRADIENT = 1,
+ ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
+ ACCENT_ENABLE_BLURBEHIND = 3, // Traditional DWM blur
+ ACCENT_ENABLE_ACRYLICBLURBEHIND = 4, // RS4 1803
+ ACCENT_ENABLE_HOST_BACKDROP = 5, // RS5 1809
+ ACCENT_INVALID_STATE = 6 // Using this value will remove the window background
+ };
+
+ enum ACCENT_FLAG {
+ ACCENT_NONE = 0,
+ ACCENT_ENABLE_ACRYLIC = 1,
+ ACCENT_ENABLE_ACRYLIC_WITH_LUMINOSITY = 482
+ };
+
+ struct ACCENT_POLICY {
+ DWORD dwAccentState;
+ DWORD dwAccentFlags;
+ DWORD dwGradientColor; // #AABBGGRR
+ DWORD dwAnimationId;
+ };
+ using PACCENT_POLICY = ACCENT_POLICY *;
+
+ struct WINDOWCOMPOSITIONATTRIBDATA {
+ WINDOWCOMPOSITIONATTRIB Attrib;
+ PVOID pvData;
+ SIZE_T cbData;
+ };
+ using PWINDOWCOMPOSITIONATTRIBDATA = WINDOWCOMPOSITIONATTRIBDATA *;
+
+ using SetWindowCompositionAttributePtr = BOOL(WINAPI *)(HWND, PWINDOWCOMPOSITIONATTRIBDATA);
+
// The thickness of an auto-hide taskbar in pixels.
static constexpr const quint8 kAutoHideTaskBarThickness = 2;
@@ -105,6 +181,7 @@
DYNAMIC_API_DECLARE(DwmGetCompositionTimingInfo);
DYNAMIC_API_DECLARE(DwmGetWindowAttribute);
DYNAMIC_API_DECLARE(DwmSetWindowAttribute);
+ DYNAMIC_API_DECLARE(DwmExtendFrameIntoClientArea);
DYNAMIC_API_DECLARE(GetDpiForWindow);
DYNAMIC_API_DECLARE(GetSystemMetricsForDpi);
DYNAMIC_API_DECLARE(GetDpiForMonitor);
@@ -114,14 +191,17 @@
#undef DYNAMIC_API_DECLARE
+ SetWindowCompositionAttributePtr pSetWindowCompositionAttribute = nullptr;
+
private:
DynamicApis() {
#define DYNAMIC_API_RESOLVE(DLL, NAME) \
- p##NAME = reinterpret_cast<decltype(p##NAME)>(DLL.resolve(#NAME))
+ p##NAME = reinterpret_cast<decltype(p##NAME)>(DLL.resolve(#NAME))
QSystemLibrary user32(QStringLiteral("user32"));
DYNAMIC_API_RESOLVE(user32, GetDpiForWindow);
DYNAMIC_API_RESOLVE(user32, GetSystemMetricsForDpi);
+ DYNAMIC_API_RESOLVE(user32, SetWindowCompositionAttribute);
QSystemLibrary shcore(QStringLiteral("shcore"));
DYNAMIC_API_RESOLVE(shcore, GetDpiForMonitor);
@@ -132,6 +212,7 @@
DYNAMIC_API_RESOLVE(dwmapi, DwmGetCompositionTimingInfo);
DYNAMIC_API_RESOLVE(dwmapi, DwmGetWindowAttribute);
DYNAMIC_API_RESOLVE(dwmapi, DwmSetWindowAttribute);
+ DYNAMIC_API_RESOLVE(dwmapi, DwmExtendFrameIntoClientArea);
QSystemLibrary winmm(QStringLiteral("winmm"));
DYNAMIC_API_RESOLVE(winmm, timeGetDevCaps);
@@ -246,6 +327,11 @@
return result;
}
+ static inline bool isWin1122H2OrGreater() {
+ static const bool result = IsWindows1122H2OrGreater_Real();
+ return result;
+ }
+
static inline bool isDwmCompositionEnabled() {
if (isWin8OrGreater()) {
return true;
@@ -332,7 +418,7 @@
static inline quint32 getDpiForWindow(HWND hwnd) {
const DynamicApis &apis = DynamicApis::instance();
- if (apis.pGetDpiForWindow) { // Win10
+ if (apis.pGetDpiForWindow) { // Win10
return apis.pGetDpiForWindow(hwnd);
} else if (apis.pGetDpiForMonitor) { // Win8.1
HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
@@ -379,16 +465,7 @@
getSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
}
- static void updateInternalWindowFrameMargins(HWND hwnd, QWindow *window) {
- const auto margins = [hwnd]() -> QMargins {
- const auto titleBarHeight = int(getTitleBarHeight(hwnd));
- if (isWin10OrGreater()) {
- return {0, -titleBarHeight, 0, 0};
- } else {
- const auto frameSize = int(getResizeBorderThickness(hwnd));
- return {-frameSize, -titleBarHeight, -frameSize, -frameSize};
- }
- }();
+ static void setInternalWindowFrameMargins(QWindow *window, const QMargins &margins) {
const QVariant marginsVar = QVariant::fromValue(margins);
window->setProperty("_q_windowsCustomMargins", marginsVar);
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
@@ -414,10 +491,10 @@
monitorInfo.cbSize = sizeof(monitorInfo);
::GetMonitorInfoW(monitor, &monitorInfo);
return monitorInfo;
- };
+ }
- static inline void moveToDesktopCenter(HWND hwnd) {
- const auto monitorInfo = getMonitorForWindow(hwnd);
+ static inline void moveWindowToDesktopCenter(HWND hwnd) {
+ MONITORINFOEXW monitorInfo = getMonitorForWindow(hwnd);
RECT windowRect{};
::GetWindowRect(hwnd, &windowRect);
const auto newX = monitorInfo.rcMonitor.left +
@@ -426,6 +503,71 @@
(RECT_HEIGHT(monitorInfo.rcMonitor) - RECT_HEIGHT(windowRect)) / 2;
::SetWindowPos(hwnd, nullptr, newX, newY, 0, 0,
SWP_NOACTIVATE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER);
+ }
+
+ static inline void moveWindowToMonitor(HWND hwnd, const MONITORINFOEXW &activeMonitor) {
+ RECT currentMonitorRect = getMonitorForWindow(hwnd).rcMonitor;
+ RECT activeMonitorRect = activeMonitor.rcMonitor;
+ // We are in the same monitor, nothing to adjust here.
+ if (currentMonitorRect == activeMonitorRect) {
+ return;
+ }
+ RECT currentWindowRect{};
+ ::GetWindowRect(hwnd, ¤tWindowRect);
+ auto newWindowX =
+ activeMonitorRect.left + (currentWindowRect.left - currentMonitorRect.left);
+ auto newWindowY = activeMonitorRect.top + (currentWindowRect.top - currentMonitorRect.top);
+ ::SetWindowPos(hwnd, nullptr, newWindowX, newWindowY, RECT_WIDTH(currentWindowRect),
+ RECT_HEIGHT(currentWindowRect),
+ SWP_NOACTIVATE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER);
+ }
+
+ static inline void bringWindowToFront(HWND hwnd) {
+ HWND oldForegroundWindow = ::GetForegroundWindow();
+ if (!oldForegroundWindow) {
+ // The foreground window can be NULL, it's not an API error.
+ return;
+ }
+ MONITORINFOEXW activeMonitor = getMonitorForWindow(oldForegroundWindow);
+ // We need to show the window first, otherwise we won't be able to bring it to front.
+ if (!::IsWindowVisible(hwnd)) {
+ ::ShowWindow(hwnd, SW_SHOW);
+ }
+ if (IsMinimized(hwnd)) {
+ // Restore the window if it is minimized.
+ ::ShowWindow(hwnd, SW_RESTORE);
+ // Once we've been restored, throw us on the active monitor.
+ moveWindowToMonitor(hwnd, activeMonitor);
+ // When the window is restored, it will always become the foreground window.
+ // So return early here, we don't need the following code to bring it to front.
+ return;
+ }
+ // OK, our window is not minimized, so now we will try to bring it to front manually.
+ // First try to send a message to the current foreground window to check whether
+ // it is currently hanging or not.
+ if (!::SendMessageTimeoutW(oldForegroundWindow, WM_NULL, 0, 0,
+ SMTO_BLOCK | SMTO_ABORTIFHUNG | SMTO_NOTIMEOUTIFNOTHUNG, 1000,
+ nullptr)) {
+ // The foreground window hangs, can't activate current window.
+ return;
+ }
+ DWORD windowThreadProcessId = ::GetWindowThreadProcessId(oldForegroundWindow, nullptr);
+ DWORD currentThreadId = ::GetCurrentThreadId();
+ // We won't be able to change a window's Z order if it's not our own window,
+ // so we use this small technique to pretend the foreground window is ours.
+ ::AttachThreadInput(windowThreadProcessId, currentThreadId, TRUE);
+
+ [[maybe_unused]] const auto &cleaner =
+ qScopeGuard([windowThreadProcessId, currentThreadId]() {
+ ::AttachThreadInput(windowThreadProcessId, currentThreadId, FALSE); //
+ });
+
+ ::BringWindowToTop(hwnd);
+ // Activate the window too. This will force us to the virtual desktop this
+ // window is on, if it's on another virtual desktop.
+ ::SetActiveWindow(hwnd);
+ // Throw us on the active monitor.
+ moveWindowToMonitor(hwnd, activeMonitor);
}
static inline bool isFullScreen(HWND hwnd) {
@@ -764,7 +906,20 @@
return ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
}
- static inline void addManagedWindow(HWND hWnd, Win32WindowContext *ctx) {
+ static inline void addManagedWindow(QWindow *window, HWND hWnd, Win32WindowContext *ctx) {
+ const auto margins = [hWnd]() -> QMargins {
+ const auto titleBarHeight = int(getTitleBarHeight(hWnd));
+ if (isWin10OrGreater()) {
+ return {0, -titleBarHeight, 0, 0};
+ } else {
+ const auto frameSize = int(getResizeBorderThickness(hWnd));
+ return {-frameSize, -titleBarHeight, -frameSize, -frameSize};
+ }
+ }();
+
+ // Inform Qt we want and have set custom margins
+ setInternalWindowFrameMargins(window, margins);
+
// Store original window proc
if (!g_qtWindowProc) {
g_qtWindowProc = reinterpret_cast<WNDPROC>(::GetWindowLongPtrW(hWnd, GWLP_WNDPROC));
@@ -807,12 +962,24 @@
void Win32WindowContext::virtual_hook(int id, void *data) {
switch (id) {
case CentralizeHook: {
+ if (!windowId)
+ return;
const auto hwnd = reinterpret_cast<HWND>(windowId);
- moveToDesktopCenter(hwnd);
+ moveWindowToDesktopCenter(hwnd);
+ return;
+ }
+
+ case RaiseWindowHook: {
+ if (!windowId)
+ return;
+ const auto hwnd = reinterpret_cast<HWND>(windowId);
+ bringWindowToFront(hwnd);
return;
}
case ShowSystemMenuHook: {
+ if (!windowId)
+ return;
const auto &pos = *static_cast<const QPoint *>(data);
auto hWnd = reinterpret_cast<HWND>(windowId);
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
@@ -823,6 +990,113 @@
#endif
showSystemMenu2(hWnd, qpoint2point(nativeGlobalPos), false,
m_delegate->isHostSizeFixed(m_host));
+ return;
+ }
+
+ case WindowAttributeChangedHook: {
+ auto args = static_cast<void **>(data);
+ const auto &key = *static_cast<const QString *>(args[0]);
+ const auto &newVar = *static_cast<const QVariant *>(args[1]);
+ const auto &oldVar = *static_cast<const QVariant *>(args[2]);
+
+ if (!windowId)
+ return;
+ const auto hwnd = reinterpret_cast<HWND>(windowId);
+
+ const DynamicApis &apis = DynamicApis::instance();
+
+ if (key == QStringLiteral("frame-shadow")) {
+ if (newVar.toBool()) {
+ // TODO: set off
+ } else {
+ // TODO: set on
+ }
+ } else if (key == QStringLiteral("mica")) {
+ if (!isWin11OrGreater()) {
+ return;
+ }
+ if (newVar.toBool()) {
+ // We need to extend the window frame into the whole client area to be able
+ // to see the blurred window background.
+ static constexpr const MARGINS margins = {-1, -1, -1, -1};
+ apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+ if (isWin1122H2OrGreater()) {
+ // Use official DWM API to enable Mica, available since Windows 11 22H2 (10.0.22621).
+ const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_MAINWINDOW;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType, sizeof(backdropType));
+ } else {
+ // Use undocumented DWM API to enable Mica, available since Windows 11 (10.0.22000).
+ const BOOL enable = TRUE;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_MICA_EFFECT, &enable, sizeof(enable));
+ }
+ } else {
+ if (isWin1122H2OrGreater()) {
+ const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType, sizeof(backdropType));
+ } else {
+ const BOOL enable = FALSE;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_MICA_EFFECT, &enable, sizeof(enable));
+ }
+ static constexpr const MARGINS margins = {0, 0, 0, 0};
+ apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+ }
+ } else if (key == QStringLiteral("mica-alt")) {
+ if (!isWin1122H2OrGreater()) {
+ return;
+ }
+ if (newVar.toBool()) {
+ // We need to extend the window frame into the whole client area to be able
+ // to see the blurred window background.
+ static constexpr const MARGINS margins = {-1, -1, -1, -1};
+ apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+ // Use official DWM API to enable Mica Alt, available since Windows 11 22H2 (10.0.22621).
+ const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_TABBEDWINDOW;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType, sizeof(backdropType));
+ } else {
+ const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType, sizeof(backdropType));
+ static constexpr const MARGINS margins = {0, 0, 0, 0};
+ apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+ }
+ } else if (key == QStringLiteral("acrylic-material")) {
+ if (newVar.toBool()) {
+ // We need to extend the window frame into the whole client area to be able
+ // to see the blurred window background.
+ static constexpr const MARGINS margins = {-1, -1, -1, -1};
+ apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+ if (isWin11OrGreater()) {
+ const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_TRANSIENTWINDOW;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType, sizeof(backdropType));
+ } else {
+ ACCENT_POLICY policy{};
+ policy.dwAccentState = ACCENT_ENABLE_ACRYLICBLURBEHIND;
+ policy.dwAccentFlags = ACCENT_ENABLE_ACRYLIC_WITH_LUMINOSITY;
+ // This API expects the #AABBGGRR format.
+ //policy.dwGradientColor = DWORD(qRgba(gradientColor.blue(), gradientColor.green(), gradientColor.red(), gradientColor.alpha()));
+ WINDOWCOMPOSITIONATTRIBDATA wcad{};
+ wcad.Attrib = WCA_ACCENT_POLICY;
+ wcad.pvData = &policy;
+ wcad.cbData = sizeof(policy);
+ apis.pSetWindowCompositionAttribute(hwnd, &wcad);
+ }
+ } else {
+ if (isWin11OrGreater()) {
+ const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
+ apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType, sizeof(backdropType));
+ } else {
+ ACCENT_POLICY policy{};
+ policy.dwAccentState = ACCENT_DISABLED;
+ policy.dwAccentFlags = ACCENT_NONE;
+ WINDOWCOMPOSITIONATTRIBDATA wcad{};
+ wcad.Attrib = WCA_ACCENT_POLICY;
+ wcad.pvData = &policy;
+ wcad.cbData = sizeof(policy);
+ apis.pSetWindowCompositionAttribute(hwnd, &wcad);
+ }
+ static constexpr const MARGINS margins = {0, 0, 0, 0};
+ apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
+ }
+ }
return;
}
@@ -837,6 +1111,9 @@
}
case DrawWindows10BorderHook: {
+ if (!windowId)
+ return;
+
auto args = static_cast<void **>(data);
auto &painter = *static_cast<QPainter *>(args[0]);
const auto &rect = *static_cast<const QRect *>(args[1]);
@@ -876,10 +1153,8 @@
return;
}
- default: {
- // unreachable
+ default:
break;
- }
}
AbstractWindowContext::virtual_hook(id, data);
}
@@ -892,8 +1167,13 @@
return getWindowFrameBorderThickness(reinterpret_cast<HWND>(windowId));
}
- void Win32WindowContext::winIdChanged(QWindow *oldWindow) {
- removeManagedWindow(reinterpret_cast<HWND>(windowId));
+ void Win32WindowContext::winIdChanged() {
+ // If the original window id is valid, remove all resources related
+ if (windowId) {
+ removeManagedWindow(reinterpret_cast<HWND>(windowId));
+ windowId = 0;
+ }
+
if (!m_windowHandle) {
return;
}
@@ -912,11 +1192,8 @@
}
#endif
- // Inform Qt we want and have set custom margins
- updateInternalWindowFrameMargins(hWnd, m_windowHandle);
-
// Add managed window
- addManagedWindow(hWnd, this);
+ addManagedWindow(m_windowHandle, hWnd, this);
// Cache win id
windowId = winId;
@@ -1180,6 +1457,53 @@
const WindowPart currentWindowPart = lastHitTestResult;
if (message == WM_NCMOUSEMOVE) {
if (currentWindowPart != WindowPart::ChromeButton) {
+ // https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/widgets/kernel/qwidgetwindow.cpp#L472
+ // When the mouse press event arrives, QWidgetWindow will implicitly grab
+ // the top widget right under the mouse, and set `qt_button_down` to this
+ // widget. At this time, no other widgets will accept the mouse event until
+ // QWidgetWindow receives the mouse release event, then set `qt_button_down`
+ // to null.
+
+ // Imagine the following situation, now the main window has a pop-up menu,
+ // the focus is not on the main window, if we click outside the pop-up menu,
+ // the menu will close, which seems to be completely fine. But if we close
+ // the menu by clicking on the title bar draggable area, then other widgets
+ // won't accept the mouse message afterwards.
+
+ // Here's the reason.
+ // When the mouse is placed in the draggable area of the title bar, there
+ // are two situations.
+
+ // 1. If the focus is on the main window, and the last result of
+ // WM_NCHITTEST is HTCAPTION, the mouse click event in the title bar is
+ // taken over by Windows and Qt does not receive the mouse click event.
+
+ // 2. If the main window has a pop-up menu, it is completely different. When
+ // the mouse is pressed on the title bar, Windows sends the WM_LBUTTONDOWN
+ // message to the window plane of the pop-up menu, the menu is closed, but
+ // Qt will continue to forward the event to the QWidget under the mouse, and
+ // the event will be processed by QWidgetWindow, causing the title bar
+ // widget to be implicitly grabbed. After the menu is closed, Windows
+ // immediately sends WM_NCHITTEST, because the mouse is in the title bar
+ // draggable area, the result is HTCAPTION, so when the mouse is released,
+ // Windows sends WM_NCLBUTTONUP, which is a non-client message, and it
+ // will be ignored by Qt. As a consequence, QWidgetWindow can't receive a
+ // mouse release message in the client area, so the grab remains, and other
+ // widgets cannot receive mouse events.
+
+ // Since we didn't watch the menu window, we cannot capture any mouse
+ // press events sent by Windows, so we cannot solve this problem by
+ // recording mouse events. Fortunately, we found that the main window will
+ // receive a WM_NCMOUSEMOVE message immediately after the menu is closed, so
+ // we just manually send a mouse release event when this message arrives and
+ // set qt_button_down to null. Don't worry, when receiving WM_NCMOUSEMOVE,
+ // there shouldn't be any control in the state of being grabbed.
+
+ // In the native window, although QWidgetWindow handles the forwarded mouse
+ // press event when the menu is closed, since the native title bar is not a
+ // QWidget, no widget will be grabbed, and `qt_button_down` remains empty,
+ // the above problems would not arise.
+
m_delegate->resetQtGrabbedControl(m_host);
if (mouseLeaveBlocked) {
emulateClientAreaMessage(hWnd, message, wParam, lParam,
@@ -1242,6 +1566,8 @@
// 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.
+
+ // Why do we need to call this function here?
m_delegate->resetQtGrabbedControl(m_host);
}
}
@@ -1264,7 +1590,7 @@
// function.
if (wParam && !lParam) {
centered = true;
- moveToDesktopCenter(hWnd);
+ moveWindowToDesktopCenter(hWnd);
}
}
break;
@@ -1351,7 +1677,6 @@
// 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)); //
});
@@ -1474,7 +1799,7 @@
*result = (isTitleBar ? HTCAPTION : HTCLIENT);
return true;
}
- // At this point, we know that the cursor is inside the client area
+ // 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
--
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