DxRichEdit.UndoAsync(CancellationToken) Method

Cancels the last action.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v25.1.dll

NuGet Package: DevExpress.Blazor.RichEdit

Declaration

public ValueTask<bool> UndoAsync(
    CancellationToken cancellationToken = default(CancellationToken)
)

Optional Parameters

Name	Type	Default	Description
cancellationToken	CancellationToken	null	An object that propagates a cancellation notification.

Returns

Type	Description
ValueTask<Boolean>	A structure that stores an awaitable result of an asynchronous operation.

Remarks

The Rich Text editor keeps track of user actions. Click the Undo button to cancel the actions. You can also use the UndoAsync method to undo the last action from code.

The code snippet below adds new text to the documents, and undoes and redoes this operation:

<DxRichEdit @ref=rich />

@code {
    DxRichEdit rich;
    async Task ModifyDocumentContent() {
        Document documentApi = rich.DocumentAPI;
        documentApi.BeginUpdate();
        Paragraph body = await documentApi.Paragraphs.CreateAsync(0);
        TextSpan text = await documentApi.AddTextAsync(0, "New text");
        documentApi.EndUpdate();
        await rich.UndoAsync();
        await rich.RedoAsync();
    }
    @* ... *@
}