本文整理汇总了TypeScript中@dataservices/virtualization/view-editor/command/undo-redo/undo-manager.UndoManager.peekUndoCommand方法的典型用法代码示例。如果您正苦于以下问题：TypeScript UndoManager.peekUndoCommand方法的具体用法？TypeScript UndoManager.peekUndoCommand怎么用？TypeScript UndoManager.peekUndoCommand使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类@dataservices/virtualization/view-editor/command/undo-redo/undo-manager.UndoManager的用法示例。
在下文中一共展示了UndoManager.peekUndoCommand方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: it
it( "shouldClear", () => {
const undoMgr = new UndoManager();
const cmd = CommandFactory.createUpdateViewNameCommand( "newName", "oldName");
const undoable = CommandFactory.createUndoable( cmd as Command ) ;
undoMgr.add( undoable as Undoable );
expect( undoMgr.canRedo() ).toBe( false );
expect( undoMgr.canUndo() ).toBe( true );
expect( () => { undoMgr.peekRedoCommand(); } ).toThrow();
expect( () => { undoMgr.popRedoCommand(); } ).toThrow();
expect( undoMgr.peekUndoCommand() instanceof Command ).toBe( true );
expect( undoMgr.toArray().length ).toBe( 1 );
// now pop
expect( undoMgr.popUndoCommand() instanceof Command ).toBe( true );
expect( undoMgr.canRedo() ).toBe( true );
expect( undoMgr.canUndo() ).toBe( false );
expect( () => { undoMgr.peekUndoCommand(); } ).toThrow();
expect( () => { undoMgr.popUndoCommand(); } ).toThrow();
expect( undoMgr.peekRedoCommand() instanceof Command ).toBe( true );
expect( undoMgr.toArray().length ).toBe( 1 );
expect( undoMgr.toJSON()[ "undoables"].length ).toBe( 1 );
} );示例2: expect
expect( () => { undoMgr.peekUndoCommand(); } ).toThrow();