本文整理匯總了TypeScript中@dataservices/virtualization/view-editor/command/undo-redo/undo-manager.UndoManager.peekUndoCommand方法的典型用法代碼示例。如果您正苦於以下問題：TypeScript UndoManager.peekUndoCommand方法的具體用法？TypeScript UndoManager.peekUndoCommand怎麽用？TypeScript UndoManager.peekUndoCommand使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類@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個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的TypeScript代碼示例。
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();