希望添加对触屏的一点优化

[CheYHinSpark]

WPF是支持触屏的。我自己用的电脑是触屏的，在用手指触摸移动的时候，我不希望出现选择文本的那种效果，而是翻页效果。当然在用鼠标时还是像原来一样。我自己的方法是在MainWindow.xaml.cs里面加了以下内容：

    private Point touchStartPoint;
    private Point touchEndPoint;
    //右边的部分
    private void MvvmCWBrowser_PreviewTouchDown(object sender, System.Windows.Input.TouchEventArgs e)
    {
        string src = $"onmousedown=new Function(\"return false\")";
        mvvmCWBrowser.GetMainFrame().ExecuteJavaScriptAsync(src);
        touchStartPoint = e.GetTouchPoint(mvvmCWBrowser).Position;
    }

    private void MvvmCWBrowser_PreviewTouchMove(object sender, System.Windows.Input.TouchEventArgs e)
    {
        touchEndPoint = e.GetTouchPoint(mvvmCWBrowser).Position;
        string src = $"scrollBy({-touchEndPoint.X+touchStartPoint.X}, {-touchEndPoint.Y + touchStartPoint.Y})";
        mvvmCWBrowser.GetMainFrame().ExecuteJavaScriptAsync(src);
        touchStartPoint = touchEndPoint;
    }

    //左边的部分
    private void MvvmTextEditor_PreviewTouchDown(object sender, System.Windows.Input.TouchEventArgs e)
    {
        touchStartPoint = e.GetTouchPoint(mvvmTextEditor).Position;
        mvvmTextEditor.IsTouched = true;
    }

    private void MvvmTextEditor_PreviewTouchMove(object sender, System.Windows.Input.TouchEventArgs e)
    {
        touchEndPoint = e.GetTouchPoint(mvvmTextEditor).Position;
        mvvmTextEditor.ScrollToVerticalOffset(mvvmTextEditor.VerticalOffset + (touchStartPoint.Y - touchEndPoint.Y));
        touchStartPoint = touchEndPoint;
    }

然后在MvvmTextEditor.cs里加了

    public bool IsTouched = false;
    protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
    {
        if (!IsTouched)
        {
            base.OnPreviewMouseDown(e);
        }
        else
        {
            e.Handled = true;
        }
    }
    protected override void OnPreviewMouseUp(MouseButtonEventArgs e)
    {
        if (!IsTouched)
        {
            base.OnPreviewMouseUp(e);
        }
        else
        {
            e.Handled = true;
        }
        IsTouched = false;
    }

最后在MvvmChromiumWebBrowser中加

    protected override void OnMouseUp(MouseButtonEventArgs e)
    {
        base.OnMouseUp(e);
        string src = $"onmousedown=new Function(\"return true\")";
        this.GetMainFrame().ExecuteJavaScriptAsync(src);
    }

本人纯小白，不知道有没有什么更好的实现方法……也不知道大佬们还有没有关注这个……

[chenguanzhou]

感谢关注。你有空的话，可以把代码拉下来，提交一个pull request