Silverlight:将子窗口重新定位到中心

Question

子窗口内的内容会发生变化,这会导致我的子窗口失去它的中心对齐....内容更改后,无论如何都要将子窗口重新定位到中心...我尝试了以下操作并且它不起作用:

this.horizontalalignment = horizontalalignment.center;
this.verticalalignment = verticalalignment.center;

谢谢

Answer 1

似乎应该责怪ChildWindow模板上存在RenderTransform.TransformGroup是默认模板的一部分,允许您在窗口中移动.

更改布局后,重置变换的方法是:

        //after you do some change to the childwindow layout
        sp.Children.Add(new Button() { Content = "a" });

        Dispatcher.BeginInvoke(() =>
        {
            //reset the transform to zero
            (this.GetTemplateChild("ContentRoot") as Grid).RenderTransform = new TransformGroup()
            {
                Children = { new ScaleTransform(), new SkewTransform(), new RotateTransform(), new TranslateTransform() }
            };
        }); 

或更自动:

    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        var contentRoot = this.GetTemplateChild("ContentRoot") as FrameworkElement;
        contentRoot.LayoutUpdated += contentRoot_LayoutUpdated;
    }

    void contentRoot_LayoutUpdated(object sender, EventArgs e)
    {
        var contentRoot = this.GetTemplateChild("ContentRoot") as FrameworkElement;
        var tg = contentRoot.RenderTransform as TransformGroup;
        var tts = tg.Children.OfType<TranslateTransform>();
        foreach (var t in tts)
        {
            t.X = 0; t.Y = 0;
        }
    }

经常调用LayoutUpdated,因此您可能需要检查contentRoot.ActualWidth和ActualHeight是否已更改,以确定是否确实需要清除转换.