_getBoundingBox addSelection applyCloneShapes applyTransform applyTransform backStep cancel canRotate canSelect canTransform click cloneSelection cloneShapes Create deleteSelection deleteVertex doubleClick draw dynamicChangeEnded getBoundingBox getLockRotateHandle getLockSelHandle getLockSelShape getSelectedHandle getSelectedIDs getSelectedPostion getSelectedShape getSelectedShapeHandle getSelection getSelectionForChange getSelectState getSelectType getShape getShape getStep groupSelection hitTestAll hitTestHandles initializeWithSelection insertVertex isCloneDrag isDragRectCorner isEditMode isFixedLength isIntersectMode isLocked isSelected isSelectedByType longPress m_boxHandle m_boxsel m_canRotateHandle m_clones m_dragging m_editMode m_handleIndex m_hit m_id m_insertPt m_ptSnap m_ptStart m_rotateAngle m_rotateHandle m_selIds m_shapeEdited m_showSel MgCmdSelect Name overturnPolygon release resetSelection sel_iterator selectAll selectionChanged setEditMode setFixedLength setLocked snapPoint switchClosed touchBegan touchEnded touchMoved twoFingersMove ungroupSelection

backStep() bool MgCmdSelect::backStep ( const MgMotion *  sender ) privatevirtual 回退一步 实现了 MgCommand. 函数调用图: 这是这个函数的调用关系图: