acquireDynamicShapes acquireFrontDoc acquireFrontDoc addImageShape addImageShape addRef addShapesForTest backDoc backShapes canRedo canUndo clear clearCachedData displayToModel doContextAction exportSVGPath exportSVGPath2 findShapeByImageID findShapeByTag freeContent fromHandle getBoundingBox getBoundingBox getBoundingBox getChangeCount getCommand getCommand getContent getContent getContent getContent getContext getDisplayExtent getDisplayExtent getDrawCount getFrameFlags getFrameIndex getFrameTick getHandlePoint getImageSize getModelBox getModelBox getPlayingTick getRecordTick getRedoCount getRedoIndex getSelectedHandle getSelectedShapeCount getSelectedShapeID getSelectedShapeIDs getSelectedShapeType getShapeCount getShapeCount getShapeFlag getUnlockedShapeCount getViewModelBox getVisibleShapeCount hasImageShape importSVGPath isCommand isDrawing isDrawingCommand isPaused isPlaying isPressDragging isRecording isStopping isUndoLoading isUndoRecording isZooming loadFromFile loadShapes release releaseDoc releaseShapes saveShapes saveShapes saveToFile saveToFile setCommand setContent setContext setContext setContextEditing setSelectedShapeIDs setShapeFlag stopDrawing switchCommand toHandle traverseImageShapes viewAdapterHandle viewDataHandle zoomPan zoomToExtent zoomToInitial zoomToModel ~MgCoreView

canUndo() virtual bool MgCoreView::canUndo ( ) const pure virtual 能否撤销 在 GiCoreView 内被实现.