DAWorkFlowGraphicsView.h

#ifndef DAWORKFLOWGRAPHICSVIEW_H
#define DAWORKFLOWGRAPHICSVIEW_H
#include <QtCore/qglobal.h>
#include <QPointer>
#include <QUndoStack>
#include "DAGuiAPI.h"
#include "DAGraphicsView.h"
#include "DAGraphicsItem.h"
#include "DAAbstractNodeWidget.h"
 
class QDragEnterEvent;
class QDragMoveEvent;
class QDragLeaveEvent;
class QDropEvent;
 
namespace DA
{
class DAWorkFlowGraphicsScene;
class DADataWorkFlow;
class DAGUI_API DAWorkFlowGraphicsView : public DAGraphicsView
{
    Q_OBJECT
    DA_DECLARE_PRIVATE(DAWorkFlowGraphicsView)
public:
    DAWorkFlowGraphicsView(QWidget* parent = 0);
    DAWorkFlowGraphicsView(QGraphicsScene* scene, QWidget* parent = 0);
    ~DAWorkFlowGraphicsView();
    void setWorkFlow(DAWorkFlow* wf);
    DAWorkFlow* getWorkflow();
    // 激活UndoStack
    void setUndoStackActive();
    QUndoStack* getUndoStack();
    DAWorkFlowGraphicsScene* getWorkFlowGraphicsScene();
    // 获取当前view视图下的scene中心
    QPointF getViewCenterMapToScene() const;
    // 把item移动到屏幕中心
    void moveItemToViewCenter(QGraphicsItem* item);
    // 复制当前选中的items
    bool copySelectItems();
    // 复制到剪切板
    void copyItems(const QList< DAGraphicsItem* >& its, bool isCopy = true);
    // 复制当前选中的items
    void cutSelectItems();
    // 粘贴,会发射pastedItems信号
    QList< QGraphicsItem* > paste();
    // 粘贴到视图中心
    void pasteToViewCenter();
    // 粘贴，同时偏移一个距离
    void pasteByOffset(const QPointF& offset);
    // 设置item的选中状态
    void setSelectionState(const QList< QGraphicsItem* >& items, bool isSelect);
    // 取消选中
    void clearSelection();
    // 全选
    void selectAll();
    // 计算item所包含的范围，这个范围存入xml中，以便让scene第一时间知道总体范围
    static QRectF calcItemsSceneRange(const QList< QGraphicsItem* >& its);
    //
    static QList< QGraphicsItem* > cast(const QList< DAGraphicsItem* >& its);
    // 所有item偏移一个距离
    void offsetItems(const QList< QGraphicsItem* >& its, const QPointF& offset);
    // 通过node元对象创建工作流节点
    DAAbstractNodeGraphicsItem* createNode(const DANodeMetaData& md, const QPoint& pos);
    DAAbstractNodeGraphicsItem* createNode_(const DANodeMetaData& md, const QPoint& pos);
 
signals:
 
    void nodeItemDeleted(const QList< QGraphicsItem* >& items);
 
    void pastedItems(const QList< QGraphicsItem* >& items);
 
protected:
    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 dragEnterEvent(QDragEnterEvent* event) override;
    virtual void dragMoveEvent(QDragMoveEvent* event) override;
    virtual void dragLeaveEvent(QDragLeaveEvent* event) override;
    virtual void dropEvent(QDropEvent* event) override;
 
private:
    void resetCursor();
};
 
}  // namespace DA
#endif  // GNODEGRAPHICSVIEW_H