From 7955f5b084aeae334a445136839160356c96de36 Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周三, 20 12月 2023 03:59:57 +0800
Subject: [PATCH] Add comments
---
src/core/contexts/win32windowcontext.cpp | 154 +++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 143 insertions(+), 11 deletions(-)
diff --git a/src/core/contexts/win32windowcontext.cpp b/src/core/contexts/win32windowcontext.cpp
index cda9058..145b19c 100644
--- a/src/core/contexts/win32windowcontext.cpp
+++ b/src/core/contexts/win32windowcontext.cpp
@@ -414,10 +414,10 @@
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 +426,71 @@
(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) {
@@ -808,7 +873,13 @@
switch (id) {
case CentralizeHook: {
const auto hwnd = reinterpret_cast<HWND>(windowId);
- moveToDesktopCenter(hwnd);
+ moveWindowToDesktopCenter(hwnd);
+ return;
+ }
+
+ case RaiseWindowHook: {
+ const auto hwnd = reinterpret_cast<HWND>(windowId);
+ bringWindowToFront(hwnd);
return;
}
@@ -823,6 +894,23 @@
#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 (key == QStringLiteral("no-frame-shadow")) {
+ if (newVar.toBool()) {
+ // TODO: set off
+ } else {
+ // TODO: set on
+ }
+ }
+
return;
}
@@ -877,7 +965,6 @@
}
default: {
- // unreachable
break;
}
}
@@ -893,10 +980,7 @@
}
void Win32WindowContext::winIdChanged(QWindow *oldWindow) {
- if (oldWindow) {
- removeManagedWindow(reinterpret_cast<HWND>(windowId));
- }
-
+ removeManagedWindow(reinterpret_cast<HWND>(windowId));
if (!m_windowHandle) {
return;
}
@@ -1183,6 +1267,53 @@
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 area message, and it
+ // will be ignored by Qt. As a consequence, QWidgetWindow can't receive a
+ // mouse release messages 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,
@@ -1245,6 +1376,8 @@
// 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);
}
}
@@ -1267,7 +1400,7 @@
// function.
if (wParam && !lParam) {
centered = true;
- moveToDesktopCenter(hWnd);
+ moveWindowToDesktopCenter(hWnd);
}
}
break;
@@ -1354,7 +1487,6 @@
// 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)); //
});
--
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