From 0177eedd03bd9a75dafea296f77b8a6bdad9c3cb Mon Sep 17 00:00:00 2001
From: SineStriker <55847490+SineStriker@users.noreply.github.com>
Date: 周六, 04 5月 2024 20:59:54 +0800
Subject: [PATCH] Merge pull request #75 from mentalfl0w/patch-1

---
 src/core/contexts/abstractwindowcontext.cpp |   81 ++++++++++++++++++++--------------------
 1 files changed, 40 insertions(+), 41 deletions(-)

diff --git a/src/core/contexts/abstractwindowcontext.cpp b/src/core/contexts/abstractwindowcontext.cpp
index 96d215a..1c11015 100644
--- a/src/core/contexts/abstractwindowcontext.cpp
+++ b/src/core/contexts/abstractwindowcontext.cpp
@@ -7,7 +7,6 @@
 #include <QtGui/QPen>
 #include <QtGui/QPainter>
 #include <QtGui/QScreen>
-#include <memory>
 
 #include "qwkglobal_p.h"
 
@@ -15,33 +14,23 @@
 
     namespace {
 
-        class WinIdChangeEventFilter : public QObject {
-        public:
-            explicit WinIdChangeEventFilter(QObject *widget, AbstractWindowContext *ctx,
-                                            QObject *parent = nullptr)
-                : QObject(parent), ctx(ctx) {
-                widget->installEventFilter(this);
-            }
-
-        protected:
-            bool eventFilter(QObject *obj, QEvent *event) override {
-                Q_UNUSED(obj)
-                if (event->type() == QEvent::WinIdChange) {
-                    ctx->notifyWinIdChange();
-                }
-                return false;
-            }
-
-        protected:
-            AbstractWindowContext *ctx;
-        };
-
         class WindowEventFilter : public QObject {
         public:
             explicit WindowEventFilter(QWindow *window, AbstractWindowContext *ctx,
                                        QObject *parent = nullptr)
                 : QObject(parent), ctx(ctx), window(window) {
-                window->installEventFilter(this);
+                if (window)
+                    window->installEventFilter(this);
+            }
+
+            inline void setWindow(QWindow *win) {
+                if (auto oldWin = window.data(); oldWin) {
+                    oldWin->removeEventFilter(this);
+                }
+                window = win;
+                if (win) {
+                    win->installEventFilter(this);
+                }
             }
 
         protected:
@@ -51,7 +40,7 @@
 
         protected:
             AbstractWindowContext *ctx;
-            QWindow *window;
+            QPointer<QWindow> window;
         };
 
     }
@@ -66,16 +55,10 @@
         }
         m_host = host;
         m_delegate.reset(delegate);
-        m_winIdChangeEventFilter = std::make_unique<WinIdChangeEventFilter>(host, this);
-
-        m_windowHandle = m_delegate->hostWindow(m_host);
-        if (m_windowHandle) {
-            winIdChanged();
-            m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
-        }
+        m_winIdChangeEventFilter.reset(delegate->createWinIdEventFilter(host, this));
+        m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
+        notifyWinIdChange();
     }
-
-
 
     bool AbstractWindowContext::setHitTestVisible(const QObject *obj, bool visible) {
         Q_ASSERT(obj);
@@ -202,7 +185,7 @@
     void AbstractWindowContext::virtual_hook(int id, void *data) {
         switch (id) {
             case CentralizeHook: {
-                if (!m_windowHandle)
+                if (!m_windowId)
                     return;
 
                 QRect windowGeometry = m_delegate->getGeometry(m_host);
@@ -216,7 +199,7 @@
             }
 
             case RaiseWindowHook: {
-                if (!m_windowHandle)
+                if (!m_windowId)
                     return;
 
                 m_delegate->setWindowVisible(m_host, true);
@@ -248,14 +231,24 @@
     }
 
     void AbstractWindowContext::notifyWinIdChange() {
-        auto oldWindow = m_windowHandle;
+        auto oldWinId = m_windowId;
+        m_windowId = m_winIdChangeEventFilter->winId();
+
+        // In Qt6, after QWidget::close() is called, the related QWindow's all surfaces and the
+        // platform window will be removed, and the WinId will be set to 0. After that, when the
+        // QWidget is shown again, the whole things will be recreated again.
+        // As a result, we must update our WindowContext each time the WinId changes.
         m_windowHandle = m_delegate->hostWindow(m_host);
-        if (oldWindow == m_windowHandle)
-            return;
-        m_windowEventFilter.reset();
-        winIdChanged();
+
+        auto windowEventFilter = static_cast<WindowEventFilter *>(m_windowEventFilter.get());
+        windowEventFilter->setWindow(nullptr);
+
+        if (oldWinId != m_windowId) {
+            winIdChanged(m_windowId, oldWinId);
+        }
+
         if (m_windowHandle) {
-            m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
+            windowEventFilter->setWindow(m_windowHandle);
 
             // Refresh window attributes
             auto attributes = m_windowAttributes;
@@ -267,6 +260,12 @@
                 m_windowAttributes.insert(it.key(), it.value());
             }
         }
+
+        // Send to shared dispatchers
+        if (oldWinId != m_windowId) {
+            QEvent e(QEvent::WinIdChange);
+            sharedDispatch(m_host, &e);
+        }
     }
 
     QVariant AbstractWindowContext::windowAttribute(const QString &key) const {

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