Minor improvements of Win32 code

Yuhang Zhao

2024-12-09 42977738aba59150109fea3e9edd2b74643c1000

 src/widgets/widgetwindowagent_win.cpp

@@ -8,6 +8,8 @@
#include <QtCore/QDateTime>
#include <QtGui/QPainter>

#include <QtCore/private/qcoreapplication_p.h>

#include <QWKCore/qwindowkit_windows.h>
#include <QWKCore/private/qwkglobal_p.h>
#include <QWKCore/private/windows10borderhandler_p.h>
@@ -62,8 +64,13 @@
        }

        inline void forwardEventToWidgetAndDraw(QWidget *w, QEvent *event) {
            // Let the widget paint first
            static_cast<QObject *>(w)->event(event);
            // https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/widgets/kernel/qapplication.cpp#L3286
            // Deliver the event
            if (!forwardObjectEventFilters(this, w, event)) {
                // Let the widget paint first
                std::ignore = static_cast<QObject *>(w)->event(event);
                QCoreApplicationPrivate::setEventSpontaneous(event, false);
            }

            // Due to the timer or user action, Qt will repaint some regions spontaneously,
            // even if there is no WM_PAINT message, we must wait for it to finish painting
@@ -72,8 +79,13 @@
        }

        inline void forwardEventToWindowAndDraw(QWindow *window, QEvent *event) {
            // Let Qt paint first
            static_cast<QObject *>(window)->event(event);
            // https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/widgets/kernel/qapplication.cpp#L3286
            // Deliver the event
            if (!forwardObjectEventFilters(ctx, window, event)) {
                // Let Qt paint first
                std::ignore = static_cast<QObject *>(window)->event(event);
                QCoreApplicationPrivate::setEventSpontaneous(event, false);
            }

            // Upon receiving the WM_PAINT message, Qt will repaint the entire view, and we
            // must wait for it to finish painting before drawing this top border area.
@@ -84,7 +96,6 @@
        bool sharedEventFilter(QObject *obj, QEvent *event) override {
            Q_UNUSED(obj)

            auto window = widget->windowHandle();
            switch (event->type()) {
                case QEvent::Expose: {
                    // Qt will absolutely send a QExposeEvent or QResizeEvent to the QWindow when it
@@ -95,6 +106,7 @@
                    // Since a QExposeEvent will be sent immediately after the QResizeEvent, we can
                    // simply ignore it.
                    auto ee = static_cast<QExposeEvent *>(event);
                    auto window = widget->windowHandle();
                    if (window->isExposed() && isNormalWindow() && !ee->region().isNull()) {
                        forwardEventToWindowAndDraw(window, event);
                        return true;