DAGraphicsView.h

#ifndef DAGRAPHICSVIEW_H
#define DAGRAPHICSVIEW_H
#include <QGraphicsView>
#include "DAGraphicsViewGlobal.h"
#include "DAGraphicsItem.h"
#include "DAGraphicsViewOverlayMouseMarker.h"
class QWheelEvent;
namespace DA
{
class DAAbstractGraphicsViewAction;
class DAGRAPHICSVIEW_API DAGraphicsView : public QGraphicsView
{
    Q_OBJECT
    DA_DECLARE_PRIVATE(DAGraphicsView)
public:
    enum ZoomFlag
    {
        ZoomNotUseWheel     = 0x0001,  
        ZoomUseWheel        = 0x0002,  
        ZoomUseWheelAndCtrl = 0x0004   
    };
    Q_DECLARE_FLAGS(ZoomFlags, ZoomFlag)
    Q_FLAG(ZoomFlag)
 
    
    enum PadFlag
    {
        PadDiable                     = 0x0001,  
        PadByWheelMiddleButton        = 0x0002,  
        PadBySpaceWithMouseLeftButton = 0x0004   
    };
    Q_DECLARE_FLAGS(PadFlags, PadFlag)
    Q_FLAG(PadFlag)
 
public:
    DAGraphicsView(QWidget* parent = 0);
    DAGraphicsView(QGraphicsScene* scene, QWidget* parent = 0);
    ~DAGraphicsView();
    // 设置缩放的因子
    void setScaleRange(qreal min, qreal max);
    // 获取缩放因子
    qreal getScaleMaxFactor() const;
    qreal getScaleMinFactor() const;
 
    // 设置是否可以滚轮缩放
    bool isEnaleWheelZoom() const;
    void setEnaleWheelZoom(bool enaleWheelZoom = true, ZoomFlags zf = ZoomUseWheelAndCtrl);
 
    // 获取鼠标对应的scence的位置坐标
    QPointF getMouseScenePos() const;
 
    // 设置缩放flag
    void setZoomFrags(ZoomFlags zf);
    ZoomFlags getZoomFlags() const;
 
    // 判断是否在拖动
    bool isPadding() const;
    // 设置拖动属性
    void setPaddingFrags(PadFlags pf);
    PadFlags getPaddingFrags() const;
    // 选中的item
    QList< DAGraphicsItem* > selectedDAItems() const;
    // 是否空格被按下
    bool isSpacebarPressed() const;
    // 激活一个动作，DAAbstractGraphicsViewAction的内存归view管理,此函数发射viewActionActived
    void setupViewAction(DAAbstractGraphicsViewAction* act);
    // 清除视图action，此操作会把当前维护的视图action清除
    void clearViewAction();
    // 标记一个点,标记完成后
    void markPoint(const QPointF& scenePoint, const QPen& pen = QPen(Qt::blue));
    // 是否marker生效
    bool isEnableMarker() const;
    // 获取当前的markerstyle，如果没生效，返回DAGraphicsViewOverlayMouseMarker::NoMarkerStyle
    DAGraphicsViewOverlayMouseMarker::MarkerStyle getCurrentMarkerStyle() const;
    // 获取marker指针
    DAGraphicsViewOverlayMouseMarker* getMarker() const;
public slots:
    // 放大
    void zoomIn();
    // 缩小
    void zoomOut();
    // 设置最适合视图尺寸
    void zoomFit();
    // 选中所有可选的item
    void selectAll();
    // 取消所有选中
    void clearSelection();
    // 设置标记，此操作基于DAGraphicsViewOverlayMouseMarker
    void setViewMarkerStyle(DAGraphicsViewOverlayMouseMarker::MarkerStyle style);
    // 设置标记是否生效
    void setViewMarkerEnable(bool on);
 
protected:
    virtual void wheelEvent(QWheelEvent* event) override;
    virtual void mouseMoveEvent(QMouseEvent* event) override;
    virtual void mousePressEvent(QMouseEvent* event) override;
    virtual void mouseReleaseEvent(QMouseEvent* event) override;
    virtual void keyPressEvent(QKeyEvent* event) override;
    virtual void keyReleaseEvent(QKeyEvent* event) override;
    virtual void resizeEvent(QResizeEvent* event) override;
 
protected:
    void wheelZoom(QWheelEvent* event);
    // 开始拖动
    void startPad(QMouseEvent* event);
    // 结束拖动
    void endPad();
    // 创建鼠标标记，如果重载了DAGraphicsViewOverlayMouseMarker，需要重载此函数返回自己的MouseMarker
    virtual DAGraphicsViewOverlayMouseMarker* createMarker();
 
private:
    void init();
    //
    void tryInitViewMarker();
Q_SIGNALS:
    void viewActionActived(DA::DAAbstractGraphicsViewAction* act);
 
    void viewActionDeactived(DA::DAAbstractGraphicsViewAction* act);
 
private:
};
}
#endif  // GGRAPHICSVIEW_H