From 5078f898257a53295167f22c67005ad1b30d4bf8 Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周二, 12 12月 2023 02:53:57 +0800
Subject: [PATCH] Tested MinGW 13.2.0

---
 src/widgets/widgetwindowagent.cpp |   95 ++++++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 89 insertions(+), 6 deletions(-)

diff --git a/src/widgets/widgetwindowagent.cpp b/src/widgets/widgetwindowagent.cpp
index f7d016e..ea8f6df 100644
--- a/src/widgets/widgetwindowagent.cpp
+++ b/src/widgets/widgetwindowagent.cpp
@@ -1,9 +1,83 @@
 #include "widgetwindowagent.h"
 #include "widgetwindowagent_p.h"
 
+#include <QtGui/QtEvents>
+#include <QtGui/QPainter>
+#include <QtCore/QDebug>
+
 #include "widgetitemdelegate_p.h"
 
 namespace QWK {
+
+    class WidgetBorderHandler : public QObject {
+    public:
+        WidgetBorderHandler(QWidget *widget, AbstractWindowContext *ctx)
+            : widget(widget), ctx(ctx), m_thickness(0) {
+            updateThickness();
+            widget->installEventFilter(this);
+        }
+
+        void updateThickness() {
+            // Query thickness
+            bool native = false;
+            void *a[] = {
+                &native,
+                &m_thickness,
+            };
+            ctx->virtual_hook(AbstractWindowContext::BorderThicknessHook, &a);
+        }
+
+        void updateMargins() {
+            if (widget->windowState() & (Qt::WindowMaximized | Qt::WindowFullScreen)) {
+                widget->setContentsMargins({});
+            } else {
+                widget->setContentsMargins({0, int(m_thickness), 0, 0});
+            }
+        }
+
+    protected:
+        bool eventFilter(QObject *obj, QEvent *event) override {
+            switch (event->type()) {
+                case QEvent::Paint: {
+                    if (widget->windowState() & (Qt::WindowMaximized | Qt::WindowFullScreen))
+                        break;
+
+                    auto paintEvent = static_cast<QPaintEvent *>(event);
+                    QPainter painter(widget);
+                    QRect rect = paintEvent->rect();
+                    QRegion region = paintEvent->region();
+                    void *args[] = {
+                        &painter,
+                        &rect,
+                        &region,
+                    };
+                    ctx->virtual_hook(AbstractWindowContext::DrawBordersHook, args);
+                    return true;
+                }
+
+                case QEvent::WindowStateChange: {
+                    updateMargins();
+                    break;
+                }
+
+                case QEvent::WindowActivate:
+                case QEvent::WindowDeactivate: {
+                    widget->update();
+                    break;
+                }
+
+                    // TODO: Handle DPI Change
+
+                default:
+                    break;
+            }
+            return false;
+        }
+
+        QWidget *widget;
+        AbstractWindowContext *ctx;
+        quint32 m_thickness;
+    };
 
     WidgetWindowAgentPrivate::WidgetWindowAgentPrivate() {
     }
@@ -39,15 +113,24 @@
             return false;
         }
         d->hostWidget = w;
+
+        // Install painting hook
+        if (bool needPaintBorder = false;
+            d->context->virtual_hook(AbstractWindowContext::NeedsDrawBordersHook, &needPaintBorder),
+            needPaintBorder) {
+            auto borderHandler = std::make_unique<WidgetBorderHandler>(w, d->context.get());
+            borderHandler->updateMargins();
+            d->borderHandler = std::move(borderHandler);
+        }
         return true;
     }
 
-    const QWidget *WidgetWindowAgent::titleBar() const {
+    QWidget *WidgetWindowAgent::titleBar() const {
         Q_D(const WidgetWindowAgent);
-        return static_cast<const QWidget *>(d->context->titleBar());
+        return static_cast<QWidget *>(d->context->titleBar());
     }
 
-    void WidgetWindowAgent::setTitleBar(const QWidget *w) {
+    void WidgetWindowAgent::setTitleBar(QWidget *w) {
         Q_D(WidgetWindowAgent);
         if (!d->context->setTitleBar(w)) {
             return;
@@ -55,12 +138,12 @@
         Q_EMIT titleBarWidgetChanged(w);
     }
 
-    const QWidget *WidgetWindowAgent::systemButton(SystemButton button) const {
+    QWidget *WidgetWindowAgent::systemButton(SystemButton button) const {
         Q_D(const WidgetWindowAgent);
-        return static_cast<const QWidget *>(d->context->systemButton(button));
+        return static_cast<QWidget *>(d->context->systemButton(button));
     }
 
-    void WidgetWindowAgent::setSystemButton(SystemButton button, const QWidget *w) {
+    void WidgetWindowAgent::setSystemButton(SystemButton button, QWidget *w) {
         Q_D(WidgetWindowAgent);
         if (!d->context->setSystemButton(button, w)) {
             return;

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