_name backStep cancel click doContextAction doubleClick draw drawAngleText drawAngleText gatherShapes getName getSelectedIDs getShape initialize initializeWithSelection isDrawingCommand isFloatingCommand longPress MgCommand MgCommand mouseHover release touchBegan touchEnded touchMoved twoFingersMove ~MgCommand

cancel() virtual bool MgCommand::cancel ( const MgMotion *  sender ) virtual 取消命令 在 MgCommandDraw, MgCmdSelect, MgCmdDrawLines, MgCmdDrawSplines , 以及 MgCmdErase 内被实现. 这是这个函数的调用关系图: