Qt模仿Visual Studio停靠窗口效果

#pragma once
#include <QWidget>
#include <QPaintEvent>
#include "QWHDockWidget.h"
class QMainWindow;
class QTabWidget;
class QDockWidget;
class QSplitter;
class QWHTabWidgetMask : public QWidget
{
	Q_OBJECT
public:
	enum Area
	{
		None,Top, Right, Bottom, Left, TopMore, RightMore, BottomMore, LeftMore, Center, TopMost, RightMost, BottomMost, LeftMost
	};
	QWHTabWidgetMask();
	~QWHTabWidgetMask();
	static QWHTabWidgetMask *getInstance();
	// 設置程序主窗口
	void setMainWindow(QMainWindow *mainWindow);
	// 創建停靠窗口
	QWHDockWidget *createDockWidget(QWHDockWidget::AreaMode areaMode, const QString &windowTitle = "");
	// 創建分裂器（水平分裂）
	QSplitter *createSplitter();
	// 創建分裂器（由參數orientation決定分裂方向）
	QSplitter *createSplitter(Qt::Orientation orientation);
	// 設置程序主分裂器
	void setMainSplitter(QSplitter *splitter);
	// 設置目標窗口（接收方）
	void setTargetWidget(QTabWidget *widget);
	// 設置當前頁索引（鼠標移入當前頁 或 鼠標移入中心方向標）
	void setCurTabIndex(int index);
	// 設置鼠標按下的停靠窗口（準備移動的窗口）
	void setMousePressed(QWHDockWidget *moveDockWidget);
	// 設置鼠標釋放
	void setMouseReleased();
	// 獲取停靠窗口推薦最小尺寸
	QSize minimumSizeHint() const override;
	// 獲取鼠標按下的停靠窗口（準備移動或正在移動的窗口）
	QDockWidget *moveDockWidget();
	// 獲取程序主分裂器
	QSplitter *mainSplitter();
	// 獲取程序主窗口
	QMainWindow *mainWindow();
protected:
	void paintEvent(QPaintEvent *event);
private:
	// 獲取指定索引的邊界路徑
	QPainterPath tabWidgetBorderPath(QTabWidget *tabWidget, int tabIndex);
	// 繪制主停靠窗口的指示器
	void drawMainDockIndicator();
	// 繪制次停靠窗口的指示器
	void drawMinorDockIndicator();
	// 檢查鼠標所在方向標區域
	Area checkArea(QPoint globalPos);
signals:
	// 創建停靠窗口
	void dockWidgetAdded(QWHDockWidget *newDockWidget);
private:
	QMainWindow *m_mainWindow;
	QSplitter *m_mainSplitter;
	QWHDockWidget *m_moveDockWidget;
	QTabWidget *m_targetWidget;
	QList<QWHDockWidget *> m_listDockWidgets;
	int m_tabIndex;
	QColor m_borderColor;
	QColor m_bgColor;
	QRect m_centerRect;	// 中心矩形
	QRect m_topRect, m_rightRect, m_bottomRect, m_leftRect;	// 四個方位矩形（緊挨著中心矩形）
	QRect m_topMoreRect, m_rightMoreRect, m_bottomMoreRect, m_leftMoreRect;	// 更加靠邊四個方位矩形（緊挨著四個方位矩形）
	QRect m_topMostRect, m_rightMostRect, m_bottomMostRect, m_leftMostRect;	// 最靠邊四個方向矩形（緊挨著主窗口四邊）
	QPixmap m_centerPixmap;
	QPixmap m_topPixmap, m_rightPixmap, m_bottomPixmap, m_leftPixmap;
	QPixmap m_topMostPixmap, m_rightMostPixmap, m_bottomMostPixmap, m_leftMostPixmap;
	QPixmap m_centerPixmapHover;
	QPixmap m_topPixmapHover, m_rightPixmapHover, m_bottomPixmapHover, m_leftPixmapHover;
	QPixmap m_topMostPixmapHover, m_rightMostPixmapHover, m_bottomMostPixmapHover, m_leftMostPixmapHover;
};

TestVSWindow::TestVSWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);
	QWHTabWidgetMask::getInstance()->setMainWindow(this);
	
	// 測試左側停靠窗體
	QWHDockWidget *dockWidget = QWHTabWidgetMask::getInstance()->createDockWidget(QWHDockWidget::Mode_Minor, "總tab");
	QSplitter *splitter = QWHTabWidgetMask::getInstance()->createSplitter();
	splitter->addWidget(dockWidget);
	dockWidget->setFloating(false);
	
	QWidget *widget1 = new QWidget();
	widget1->setMinimumSize(200, 100);
	widget1->setStyleSheet("background-color: green;");
	dockWidget->tabWidget()->addTab(widget1, "第一頁");
	QWidget *widget2 = new QWidget();
	widget2->setMinimumSize(200, 100);
	widget2->setStyleSheet("background-color: green;");
	dockWidget->tabWidget()->addTab(widget2, "第二頁");
	QWidget *widget3 = new QWidget();
	widget3->setMinimumSize(200, 100);
	widget3->setStyleSheet("background-color: green;");
	dockWidget->tabWidget()->addTab(widget3, "第三頁");
	// 測試中間停靠窗體
	QWHDockWidget *dockWidgetCenter = QWHTabWidgetMask::getInstance()->createDockWidget(QWHDockWidget::Mode_Main, "總tabCenter");
	splitter->addWidget(dockWidgetCenter);
	dockWidgetCenter->setFloating(false);
	
	QWidget *widgetCenter1 = new QWidget();
	widgetCenter1->setMinimumSize(200, 100);
	widgetCenter1->setStyleSheet("background-color: rgb(255, 174, 201);");
	dockWidgetCenter->tabWidget()->addTab(widgetCenter1, "第一頁Center");
	QWidget *widgetCenter2 = new QWidget();
	widgetCenter2->setMinimumSize(200, 100);
	widgetCenter2->setStyleSheet("background-color: rgb(255, 174, 201);");
	dockWidgetCenter->tabWidget()->addTab(widgetCenter2, "第二頁Center");
	QWidget *widgetCenter3 = new QWidget();
	widgetCenter3->setMinimumSize(200, 100);
	widgetCenter3->setStyleSheet("background-color: rgb(255, 174, 201);");
	dockWidgetCenter->tabWidget()->addTab(widgetCenter3, "第三頁Center");
	// 測試右側停靠窗體
	QWHDockWidget *dockWidget2 = QWHTabWidgetMask::getInstance()->createDockWidget(QWHDockWidget::Mode_Minor, "總tab2");
	splitter->addWidget(dockWidget2);
	dockWidget2->setFloating(false);
	QWidget *widget12 = new QWidget();
	widget12->setMinimumSize(200, 100);
	widget12->setStyleSheet("background-color: gray;");
	dockWidget2->tabWidget()->addTab(widget12, "第一頁2");
	QWidget *widget22 = new QWidget();
	widget22->setMinimumSize(200, 100);
	widget22->setStyleSheet("background-color: gray;");
	dockWidget2->tabWidget()->addTab(widget22, "第二頁2");
	QWidget *widget32 = new QWidget();
	widget32->setMinimumSize(200, 100);
	widget32->setStyleSheet("background-color: gray;");
	dockWidget2->tabWidget()->addTab(widget32, "第三頁2");
	QWHTabWidgetMask::getInstance()->setMainSplitter(splitter);
}