InkCanvas 的撤消/重做命令堆栈 [英] undo/redo command stack for InkCanvas

问题描述

我正在使用 InkCanvas 创建类似绘画的应用程序，我愿意实施撤消和我的应用程序中的重做功能.

I am creating paint like application using InkCanvas , I am willing to implement Undo and Redo functionality in my application .

为 InkCanvas 实现撤消/重做的最佳方法是什么??

Which is the best way to implement Undo / Redo for InkCanvas ??

推荐答案

我知道为时已晚，但如果有人在这里只是为了 InkCanvas 而不是 这个答案可能有帮助:

I know its too late but if someone is here for InkCanvas only than this answer might help:

public partial class MainWindow : Window
{
    System.Windows.Ink.StrokeCollection _added;
    System.Windows.Ink.StrokeCollection _removed;
    private bool handle = true;
    public MainWindow()
    {
        InitializeComponent();
        inkCanvas1.Strokes.StrokesChanged += Strokes_StrokesChanged;
    }

    private void Strokes_StrokesChanged(object sender, System.Windows.Ink.StrokeCollectionChangedEventArgs e)
    {
        if(handle)
        {
            _added = e.Added;
            _removed = e.Removed;
        }
    }


    private void Undo(object sender, RoutedEventArgs e)
    {
        handle = false;
        inkCanvas1.Strokes.Remove(_added);
        inkCanvas1.Strokes.Add(_removed);
        handle = true;
    }

    private void Redo(object sender, RoutedEventArgs e)
    {
        handle = false;
        inkCanvas1.Strokes.Add(_added);
        inkCanvas1.Strokes.Remove(_removed);
        handle = true;
    }
}

在 XAML 中:

<InkCanvas x:Name="inkCanvas1" Width="100" Height="100" Background="Yellow"/>
<Button Content="Undo" Click="Undo" />
<Button Content="Redo" Click="Redo"/>

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