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 |   41 ++++++++++++++++++++++++++++-------------
 1 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/src/core/contexts/abstractwindowcontext.cpp b/src/core/contexts/abstractwindowcontext.cpp
index ff35f76..8fa851a 100644
--- a/src/core/contexts/abstractwindowcontext.cpp
+++ b/src/core/contexts/abstractwindowcontext.cpp
@@ -41,7 +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:
@@ -51,7 +62,7 @@
 
         protected:
             AbstractWindowContext *ctx;
-            QWindow *window;
+            QPointer<QWindow> window;
         };
 
     }
@@ -67,11 +78,11 @@
         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);
         }
     }
 
@@ -124,8 +135,7 @@
     }
 
 #ifdef Q_OS_MAC
-    void
-        AbstractWindowContext::setSystemButtonAreaCallback(const ScreenRectCallback &callback) {
+    void AbstractWindowContext::setSystemButtonAreaCallback(const ScreenRectCallback &callback) {
         m_systemButtonAreaCallback = callback;
         virtual_hook(SystemButtonAreaChangedHook, nullptr);
     }
@@ -206,12 +216,13 @@
                 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;
             }
 
@@ -248,14 +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;

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