From 2d2fc799bc698ebf7e7c8bcc394366d0d7bf071b Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周二, 20 2月 2024 18:18:39 +0800
Subject: [PATCH] Partially finish the bug after window close and reshow

---
 src/core/contexts/abstractwindowcontext.cpp |  106 ++++++++++++++++++++++++++++++++++-------------------
 1 files changed, 68 insertions(+), 38 deletions(-)

diff --git a/src/core/contexts/abstractwindowcontext.cpp b/src/core/contexts/abstractwindowcontext.cpp
index 8672faf..8fa851a 100644
--- a/src/core/contexts/abstractwindowcontext.cpp
+++ b/src/core/contexts/abstractwindowcontext.cpp
@@ -1,3 +1,7 @@
+// Copyright (C) 2023-2024 Stdware Collections (https://www.github.com/stdware)
+// Copyright (C) 2021-2023 wangwenx190 (Yuhang Zhao)
+// SPDX-License-Identifier: Apache-2.0
+
 #include "abstractwindowcontext_p.h"
 
 #include <QtGui/QPen>
@@ -37,7 +41,18 @@
             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:
@@ -47,7 +62,7 @@
 
         protected:
             AbstractWindowContext *ctx;
-            QWindow *window;
+            QPointer<QWindow> window;
         };
 
     }
@@ -63,40 +78,15 @@
         m_host = host;
         m_delegate.reset(delegate);
         m_winIdChangeEventFilter = std::make_unique<WinIdChangeEventFilter>(host, this);
+        m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
 
         m_windowHandle = m_delegate->hostWindow(m_host);
         if (m_windowHandle) {
             winIdChanged();
-            m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
         }
     }
 
-    bool AbstractWindowContext::setWindowAttribute(const QString &key, const QVariant &attribute) {
-        auto it = m_windowAttributes.find(key);
-        if (it == m_windowAttributes.end()) {
-            if (!attribute.isValid()) {
-                return true;
-            }
-            if (!m_windowHandle || !windowAttributeChanged(key, attribute, {})) {
-                return false;
-            }
-            m_windowAttributes.insert(key, attribute);
-            return true;
-        }
 
-        if (it.value() == attribute)
-            return true;
-        if (!m_windowHandle || !windowAttributeChanged(key, attribute, it.value())) {
-            return false;
-        }
-
-        if (attribute.isValid()) {
-            it.value() = attribute;
-        } else {
-            m_windowAttributes.erase(it);
-        }
-        return true;
-    }
 
     bool AbstractWindowContext::setHitTestVisible(const QObject *obj, bool visible) {
         Q_ASSERT(obj);
@@ -145,8 +135,8 @@
     }
 
 #ifdef Q_OS_MAC
-    void AbstractWindowContext::setSystemButtonArea(const QRect &rect) {
-        m_systemButtonArea = rect;
+    void AbstractWindowContext::setSystemButtonAreaCallback(const ScreenRectCallback &callback) {
+        m_systemButtonAreaCallback = callback;
         virtual_hook(SystemButtonAreaChangedHook, nullptr);
     }
 #endif
@@ -226,16 +216,21 @@
                 if (!m_windowHandle)
                     return;
 
+                QRect windowGeometry = m_delegate->getGeometry(m_host);
                 QRect screenGeometry = m_windowHandle->screen()->geometry();
-                int x = (screenGeometry.width() - m_windowHandle->width()) / 2;
-                int y = (screenGeometry.height() - m_windowHandle->height()) / 2;
+                int x = (screenGeometry.width() - windowGeometry.width()) / 2;
+                int y = (screenGeometry.height() - windowGeometry.height()) / 2;
                 QPoint pos(x, y);
                 pos += screenGeometry.topLeft();
-                m_windowHandle->setPosition(pos);
+                m_delegate->setGeometry(m_host, QRect(pos, windowGeometry.size()));
                 return;
             }
 
             case RaiseWindowHook: {
+                if (!m_windowHandle)
+                    return;
+
+                m_delegate->setWindowVisible(m_host, true);
                 Qt::WindowStates state = m_delegate->getWindowState(m_host);
                 if (state & Qt::WindowMinimized) {
                     m_delegate->setWindowState(m_host, state & ~Qt::WindowMinimized);
@@ -264,14 +259,18 @@
     }
 
     void AbstractWindowContext::notifyWinIdChange() {
-        auto oldWindow = m_windowHandle;
+        auto windowEventFilter = static_cast<WindowEventFilter *>(m_windowEventFilter.get());
+        windowEventFilter->setWindow(nullptr);
+
+        // 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();
+
         if (m_windowHandle) {
-            m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
+            windowEventFilter->setWindow(m_windowHandle);
 
             // Refresh window attributes
             auto attributes = m_windowAttributes;
@@ -285,6 +284,37 @@
         }
     }
 
+    QVariant AbstractWindowContext::windowAttribute(const QString &key) const {
+        return m_windowAttributes.value(key);
+    }
+
+    bool AbstractWindowContext::setWindowAttribute(const QString &key, const QVariant &attribute) {
+        auto it = m_windowAttributes.find(key);
+        if (it == m_windowAttributes.end()) {
+            if (!attribute.isValid()) {
+                return true;
+            }
+            if (!m_windowHandle || !windowAttributeChanged(key, attribute, {})) {
+                return false;
+            }
+            m_windowAttributes.insert(key, attribute);
+            return true;
+        }
+
+        if (it.value() == attribute)
+            return true;
+        if (!m_windowHandle || !windowAttributeChanged(key, attribute, it.value())) {
+            return false;
+        }
+
+        if (attribute.isValid()) {
+            it.value() = attribute;
+        } else {
+            m_windowAttributes.erase(it);
+        }
+        return true;
+    }
+
     bool AbstractWindowContext::windowAttributeChanged(const QString &key,
                                                        const QVariant &attribute,
                                                        const QVariant &oldAttribute) {

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