activeView addShapesForTest canRedo canUndo clearCachedData clearShapes clearShapes close close cmdView cmdViewHandle combineRegen coreView createDummyView createGraphView createGraphView createMagnifierView createSurfaceAndImageView createSurfaceView createSurfaceView displayToModel displayToModel eraseView exportExtentAsPNG exportPNG exportPNG exportSVG exportSVGPath extentSnapshot findShapeByImageID findShapeByTag getBoundingBox getChangeCount getCommand getContent getContext getCurrentModelPoint getCurrentPoint getDisplayExtent getDisplayExtent getDrawCount getEndArrowHead getFillAlpha getFillColor getGestureEnabled getGraphView getHandlePoint getImagePath getImageShapes getImageSize getImageViewForSurface getLineAlpha getLineColor getLineStyle getLineWidth getLocalizedString getModelBox getModelBox getOptions getParent getRecordTicks getSelectedCount getSelectedHandle getSelectedIds getSelectedShapeID getSelectedType getShapeBox getShapeCount getStartArrowHead getStrokeWidth getUnlockedShapeCount getVersion getView getViewBox getViewScale getVisibleShapeCount getZoomEnabled hasImageShape importSVGPath insertBitmapFromResource insertBitmapFromResource insertBitmapFromResource insertBitmapFromResource insertImageFromFile insertImageFromFile insertSVGFromResource insertSVGFromResource insertSVGFromResource insertSVGFromResource isCommand isPaused isPlaying isRecording JARVERSION loadFromFile loadFromFile mCreator onDestroy onPause onRestoreInstanceState onResume onSaveInstanceState redo registerCmdObserver savePNG saveToFile setBackgroundColor setBackgroundDrawable setCommand setCommand setContent setContextEditing setEndArrowHead setExtraContextImages setFillAlpha setFillColor setGestureEnabled setGraphView setImagePath setLineAlpha setLineColor setLineStyle setLineWidth setOption setOption setOption setOption setSelectedIds setSelectedShapeID setStartArrowHead setStrokeWidth setVelocityTrackerEnabled setViewScale setZoomEnabled showMessage snapshot snapshotWithShapes snapshotWithShapes startRecord startUndoRecord stopRecord stopUndoRecord switchCommand TAG undo unregisterCmdObserver view ViewHelperImpl ViewHelperImpl zoomPan zoomToExtent zoomToExtent zoomToModel zoomToModel

canUndo() boolean rhcad.touchvg.view.ViewHelperImpl.canUndo ( ) 能否撤销 实现了 rhcad.touchvg.IViewHelper. 函数调用图: