From 995dc0b4d52e66adac84812dedf32785a65bce83 Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周三, 20 12月 2023 21:36:48 +0800
Subject: [PATCH] Remove hot-switch
---
src/core/contexts/win32windowcontext.cpp | 106 ++++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 84 insertions(+), 22 deletions(-)
diff --git a/src/core/contexts/win32windowcontext.cpp b/src/core/contexts/win32windowcontext.cpp
index cd1ab62..418a211 100644
--- a/src/core/contexts/win32windowcontext.cpp
+++ b/src/core/contexts/win32windowcontext.cpp
@@ -379,16 +379,7 @@
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)
@@ -829,7 +820,20 @@
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));
@@ -872,18 +876,24 @@
void Win32WindowContext::virtual_hook(int id, void *data) {
switch (id) {
case CentralizeHook: {
+ if (!windowId)
+ return;
const auto hwnd = reinterpret_cast<HWND>(windowId);
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)
@@ -911,7 +921,7 @@
}
}
- break;
+ return;
}
case DefaultColorsHook: {
@@ -925,6 +935,9 @@
}
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]);
@@ -964,10 +977,8 @@
return;
}
- default: {
- // unreachable
+ default:
break;
- }
}
AbstractWindowContext::virtual_hook(id, data);
}
@@ -980,8 +991,13 @@
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;
}
@@ -1000,11 +1016,8 @@
}
#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;
@@ -1268,6 +1281,53 @@
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,
@@ -1330,6 +1390,8 @@
// 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);
}
}
@@ -1561,7 +1623,7 @@
*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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