DAGraphicsCommandsFactory.h

#ifndef DAGRAPHICSCOMMANDSFACTORY_H
#define DAGRAPHICSCOMMANDSFACTORY_H
#include "DAGraphicsViewGlobal.h"
#include "DACommandsForGraphics.h"
class QGraphicsSceneMouseEvent;
class sceneMouseMoveEvent;
class sceneMouseReleaseEvent;
namespace DA
{
class DAGraphicsScene;
class DAGraphicsResizeableItem;
class DAGRAPHICSVIEW_API DAGraphicsCommandsFactory
{
    friend class DAGraphicsScene;
    DA_DECLARE_PRIVATE(DAGraphicsCommandsFactory)
public:
    DAGraphicsCommandsFactory();
    virtual ~DAGraphicsCommandsFactory();
    virtual DACommandsForGraphicsItemAdd* createItemAdd(QGraphicsItem* item);
    virtual DACommandsForGraphicsItemsAdd* createItemsAdd(const QList< QGraphicsItem* > its);
    virtual DACommandsForGraphicsItemRemove* createItemRemove(QGraphicsItem* item, QUndoCommand* parent = nullptr);
    virtual DACommandsForGraphicsItemsRemove* createItemsRemove(const QList< QGraphicsItem* > its);
    virtual DACommandsForGraphicsItemMoved* createItemMoved(QGraphicsItem* item,
                                                            const QPointF& start,
                                                            const QPointF& end,
                                                            bool skipfirst);
    virtual DACommandsForGraphicsItemsMoved* createItemsMoved(const QList< QGraphicsItem* >& items,
                                                              const QList< QPointF >& starts,
                                                              const QList< QPointF >& ends,
                                                              bool skipfirst);
    // 这个命令主要针对场景鼠标移动item进行设置
    virtual DACommandsForGraphicsItemsMoved* createItemsMoved();
    virtual DACommandsForGraphicsItemResized* createItemResized(DAGraphicsResizeableItem* item,
                                                                const QPointF& oldpos,
                                                                const QSizeF& oldSize,
                                                                const QPointF& newpos,
                                                                const QSizeF& newSize,
                                                                bool skipfirst = true);
    virtual DACommandsForGraphicsItemResized* createItemResized(DAGraphicsResizeableItem* item,
                                                                const QSizeF& oldSize,
                                                                const QSizeF& newSize);
    virtual DACommandsForGraphicsItemResizeWidth* createItemResizeWidth(DAGraphicsResizeableItem* item,
                                                                        const qreal& oldWidth,
                                                                        const qreal& newWidth);
    virtual DACommandsForGraphicsItemResizeHeight* createItemResizeHeight(DAGraphicsResizeableItem* item,
                                                                          const qreal& oldHeight,
                                                                          const qreal& newHeight);
    virtual DACommandsForGraphicsItemRotation* createItemRotation(DAGraphicsResizeableItem* item,
                                                                  const qreal& oldRotation,
                                                                  const qreal& newRotation);
    virtual DACommandsForGraphicsItemGrouping* createItemGrouping(const QList< QGraphicsItem* >& groupingitems);
    virtual DACommandsForGraphicsItemUngrouping* createItemUngrouping(QGraphicsItemGroup* group);
    DAGraphicsScene* scene() const;
 
protected:
    //=========================
    //==========================
    // 鼠标点击事件
    virtual void sceneMousePressEvent(QGraphicsSceneMouseEvent* mouseEvent);
    // 鼠标移动事件
    virtual void sceneMouseMoveEvent(QGraphicsSceneMouseEvent* mouseEvent);
    // 鼠标释放
    virtual void sceneMouseReleaseEvent(QGraphicsSceneMouseEvent* mouseEvent);
 
    // 记录场景鼠标左键按下的位置
    QPointF sceneMousePressPos() const;
    // 这是记录scene移动鼠标时记录的移动的item，这个函数仅仅在DACommandsForGraphicsItemsMoved* createItemsMoved(QGraphicsSceneMouseEvent* mouseReleaseEEvent);使用
    const QList< std::pair< QGraphicsItem*, QPointF > >& movingItemsStartPos() const;
    const QList< std::pair< QGraphicsItem*, QPointF > >& movingItemsEndPos() const;
    // 标记是否完成了一个完整的鼠标移动元件周期，所谓完整的鼠标移动元件周期，是指鼠标按下并选择了元件，同时鼠标拖动让元件形成位移，最后再松开鼠标
    bool isMouseMovementCycleComplete() const;
    // 是否开始进入了移动状态
    bool isBeginMovingItems() const;
    // 重置鼠标移动的循环状态，这个函数是重写sceneMouseReleaseEvent等函数时要重置状态用
    void resetMouseMovementCycleState();
 
protected:
    void setScene(DAGraphicsScene* s);
};
}  // end DA
#endif  // DAGRAPHICSVIEWCOMMANDSFACTORY_H