From 564f33e8b29a6f73050f4da3f843b942aaf0d739 Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周三, 08 5月 2024 19:36:16 +0800
Subject: [PATCH] Improve event filter handling

---
 src/core/contexts/abstractwindowcontext.cpp |  233 +++++++++++++++++++++++++++++++++++++---------------------
 1 files changed, 149 insertions(+), 84 deletions(-)

diff --git a/src/core/contexts/abstractwindowcontext.cpp b/src/core/contexts/abstractwindowcontext.cpp
index 49eb0c5..71818c2 100644
--- a/src/core/contexts/abstractwindowcontext.cpp
+++ b/src/core/contexts/abstractwindowcontext.cpp
@@ -1,38 +1,29 @@
+// 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>
 #include <QtGui/QPainter>
+#include <QtGui/QScreen>
 
 #include "qwkglobal_p.h"
 
 namespace QWK {
 
-    AbstractWindowContext::AbstractWindowContext() {
-    }
+    AbstractWindowContext::AbstractWindowContext() = default;
 
     AbstractWindowContext::~AbstractWindowContext() = default;
 
-    bool AbstractWindowContext::setup(QObject *host, WindowItemDelegate *delegate) {
-        if (!host || !delegate) {
-            return false;
+    void AbstractWindowContext::setup(QObject *host, WindowItemDelegate *delegate) {
+        if (m_host || !host || !delegate) {
+            return;
         }
-
-        auto windowHandle = delegate->hostWindow(host);
-        if (!windowHandle) {
-            return false;
-        }
-
         m_host = host;
         m_delegate.reset(delegate);
-        m_windowHandle = windowHandle;
-
-        if (!setupHost()) {
-            m_host = nullptr;
-            m_delegate = nullptr;
-            m_windowHandle = nullptr;
-            return false;
-        }
-        return true;
+        m_winIdChangeEventFilter.reset(delegate->createWinIdEventFilter(host, this));
+        notifyWinIdChange();
     }
 
     bool AbstractWindowContext::setHitTestVisible(const QObject *obj, bool visible) {
@@ -49,26 +40,10 @@
         return true;
     }
 
-    bool AbstractWindowContext::setHitTestVisible(const QRect &rect, bool visible) {
-        Q_ASSERT(rect.isValid());
-        if (!rect.isValid()) {
-            return false;
-        }
-
-        if (visible) {
-            m_hitTestVisibleRects.append(rect);
-        } else {
-            m_hitTestVisibleRects.removeAll(rect);
-        }
-        hitTestVisibleShapeDirty = true;
-        return true;
-    }
-
     bool AbstractWindowContext::setSystemButton(WindowAgentBase::SystemButton button,
                                                 QObject *obj) {
-        Q_ASSERT(obj);
         Q_ASSERT(button != WindowAgentBase::Unknown);
-        if (!obj || (button == WindowAgentBase::Unknown)) {
+        if (button == WindowAgentBase::Unknown) {
             return false;
         }
 
@@ -81,31 +56,28 @@
 
     bool AbstractWindowContext::setTitleBar(QObject *item) {
         Q_ASSERT(item);
-        if (!item) {
-            return false;
-        }
-
         if (m_titleBar == item) {
             return false;
         }
+
+        if (m_titleBar) {
+            // Since the title bar is changed, all items inside it should be dereferenced right away
+            for (auto &button : m_systemButtons) {
+                button = nullptr;
+            }
+            m_hitTestVisibleItems.clear();
+        }
+
         m_titleBar = item;
         return true;
     }
 
-    void AbstractWindowContext::showSystemMenu(const QPoint &pos) {
-        virtual_hook(ShowSystemMenuHook, &const_cast<QPoint &>(pos));
+#ifdef Q_OS_MAC
+    void AbstractWindowContext::setSystemButtonAreaCallback(const ScreenRectCallback &callback) {
+        m_systemButtonAreaCallback = callback;
+        virtual_hook(SystemButtonAreaChangedHook, nullptr);
     }
-
-    QRegion AbstractWindowContext::hitTestShape() const {
-        if (hitTestVisibleShapeDirty) {
-            hitTestVisibleShape = {};
-            for (const auto &rect : m_hitTestVisibleRects) {
-                hitTestVisibleShape += rect;
-            }
-            hitTestVisibleShapeDirty = false;
-        }
-        return hitTestVisibleShape;
-    }
+#endif
 
     bool AbstractWindowContext::isInSystemButtons(const QPoint &pos,
                                                   WindowAgentBase::SystemButton *button) const {
@@ -162,9 +134,6 @@
             }
         }
 
-        if (!m_hitTestVisibleRects.isEmpty() && hitTestShape().contains(pos)) {
-            return false;
-        }
         return true;
     }
 
@@ -172,45 +141,141 @@
         return {};
     }
 
-    static constexpr struct {
-        const quint32 grass = MAKE_RGBA_COLOR(210, 233, 189, 226);
-        const quint32 pink = MAKE_RGBA_COLOR(177, 205, 190, 240);
-        const quint32 tile = MAKE_RGBA_COLOR(193, 195, 211, 203);
-        const quint32 azure = MAKE_RGBA_COLOR(240, 240, 250, 255);
+    QWK_USED static constexpr const struct {
+        const quint32 activeLight = MAKE_RGBA_COLOR(210, 233, 189, 226);
+        const quint32 activeDark = MAKE_RGBA_COLOR(177, 205, 190, 240);
+        const quint32 inactiveLight = MAKE_RGBA_COLOR(193, 195, 211, 203);
+        const quint32 inactiveDark = MAKE_RGBA_COLOR(240, 240, 250, 255);
     } kSampleColorSet;
 
     void AbstractWindowContext::virtual_hook(int id, void *data) {
         switch (id) {
-            case NeedsDrawBordersHook: {
-                auto &result = *static_cast<bool *>(data);
-                result = false;
+            case CentralizeHook: {
+                if (!m_windowId)
+                    return;
+
+                QRect windowGeometry = m_delegate->getGeometry(m_host);
+                QRect screenGeometry = m_windowHandle->screen()->geometry();
+                int x = (screenGeometry.width() - windowGeometry.width()) / 2;
+                int y = (screenGeometry.height() - windowGeometry.height()) / 2;
+                QPoint pos(x, y);
+                pos += screenGeometry.topLeft();
+                m_delegate->setGeometry(m_host, QRect(pos, windowGeometry.size()));
                 return;
             }
-            case DrawBordersHook: {
-                auto args = static_cast<void **>(data);
-                auto &painter = *static_cast<QPainter *>(args[0]);
-                const auto &rect = *static_cast<const QRect *>(args[1]);
 
-                // Top
-                painter.setPen(kSampleColorSet.grass);
-                painter.drawLine(rect.topLeft(), rect.topRight());
+            case RaiseWindowHook: {
+                if (!m_windowId)
+                    return;
 
-                // Right
-                painter.setPen(kSampleColorSet.pink);
-                painter.drawLine(rect.topRight(), rect.bottomRight());
-
-                // Bottom
-                painter.setPen(kSampleColorSet.tile);
-                painter.drawLine(rect.bottomLeft(), rect.bottomRight());
-
-                // Right
-                painter.setPen(kSampleColorSet.azure);
-                painter.drawLine(rect.topLeft(), rect.bottomLeft());
+                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);
+                }
+                m_delegate->bringWindowToTop(m_host);
                 return;
             }
+
+            case DefaultColorsHook: {
+                auto &map = *static_cast<QMap<QString, QColor> *>(data);
+                map.clear();
+                map.insert(QStringLiteral("activeLight"), kSampleColorSet.activeLight);
+                map.insert(QStringLiteral("activeDark"), kSampleColorSet.activeDark);
+                map.insert(QStringLiteral("inactiveLight"), kSampleColorSet.inactiveLight);
+                map.insert(QStringLiteral("inactiveDark"), kSampleColorSet.inactiveDark);
+                return;
+            }
+
             default:
                 break;
         }
     }
 
-}
\ No newline at end of file
+    void AbstractWindowContext::showSystemMenu(const QPoint &pos) {
+        virtual_hook(ShowSystemMenuHook, &const_cast<QPoint &>(pos));
+    }
+
+    void AbstractWindowContext::notifyWinIdChange() {
+        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.
+        if (m_windowHandle) {
+            removeEventFilter(m_windowHandle);
+        }
+        m_windowHandle = m_delegate->hostWindow(m_host);
+
+        if (oldWinId != m_windowId) {
+            winIdChanged(m_windowId, oldWinId);
+        }
+
+        if (m_windowHandle) {
+            m_windowHandle->installEventFilter(this);
+
+            // Refresh window attributes
+            auto attributes = m_windowAttributes;
+            m_windowAttributes.clear();
+            for (auto it = attributes.begin(); it != attributes.end(); ++it) {
+                if (!windowAttributeChanged(it.key(), it.value(), {})) {
+                    continue;
+                }
+                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 {
+        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::eventFilter(QObject *obj, QEvent *event) {
+        if (obj == m_windowHandle && sharedDispatch(obj, event)) {
+            return true;
+        }
+        return QObject::eventFilter(obj, event);
+    }
+
+    bool AbstractWindowContext::windowAttributeChanged(const QString &key,
+                                                       const QVariant &attribute,
+                                                       const QVariant &oldAttribute) {
+        return false;
+    }
+
+}

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