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Image on Standard Switcher window

Docking/MDI for WPF Forum

Posted 16 years ago by FinallyInSeattle
Version: 4.5.0484
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Is there any way to provide the image that the Standard switcher window displays? The top left portion of our screens aren't distinct enough to identify the window.

Thanks in advance!

[Modified at 01/16/2009 06:52 PM]

Comments (8)

Posted 16 years ago by Actipro Software Support - Cleveland, OH, USA
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FinallyInSeattle,

Not directly but our switchers are extensible so this most likely could be done with a small amount of work.

You could probably create a class that inherits StandardSwitcher, then override OnSelectedWindowChanged (don't call the base method), and in your override do this to get the preview area: 
Border preview = this.GetTemplateChild("PART_Preview") as Border;
Then set the preview Width/Height and background to whatever you need to show. this.SelectedWindow would return the currently selected window that should be displayed in the switcher.

Actipro Software Support

Posted 16 years ago by FinallyInSeattle
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I'm invoking the following code in OnSelectedWindowChanged: 

    private void SetSwitcherImage()
    {
      Border preview = this.GetTemplateChild("PART_Preview") as Border;
      InternalWindow wdw = this.SelectedWindow as InternalWindow;
      if (wdw != null)
      {
        preview.Height = wdw.ThumbnailHeight;
        preview.Width = wdw.ThumbnailWidth;
        preview.Background = wdw.Thumbnail;
        System.Diagnostics.Debug.WriteLine("ONSELECTEDWINDOWCHANGED - " + wdw.Title);
      }
    }
The thumbnail of the first selected window appears correctly and the rest of them appear as blank. I've verified that thumbnails themselves arent' blank. Is there something I need to reset between assigning subsequent visual brush's to the background of the border?

Thanks!
Posted 16 years ago by Actipro Software Support - Cleveland, OH, USA
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If you can send over a small sample project to our support address, then we can take a look. By default, StandardSwitcher shows the contents of the Window, not the window itself. In addition, it will call UpdateLayout on the contents (if a UIElement).

I suspect the problem has to do with the Thumbnail property, but can't be sure (since there's no code for it). But we'd can debug it in the sample project.

Actipro Software Support

Posted 16 years ago by FinallyInSeattle
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The Thumbnail property is a VisualBrush that is an image of the screen.
Posted 16 years ago by Actipro Software Support - Cleveland, OH, USA
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The StandardSwitcher uses a VisualBrush as well, so I suspect you either need to build a VisualBrush from the Window contents and/or call UpdateLayout on the contents before building the VisualBrush.

Again, if you send over a project we can take a look.

Actipro Software Support

Posted 16 years ago by FinallyInSeattle
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Would you be able to send the block of code that updates the background of the border in the Switcher window? My VisualBrush's aren't blank - it's just that only the first one is displayed when the Switcher window comes up. Subsequent updates to the border background display a blank area. I'm looking to see if you're doing any refreshes on the border object itself.

Thanks for your assistance!
Posted 16 years ago by Actipro Software Support - Cleveland, OH, USA
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No, we are doing any special refreshes on the Border (PART_Preview). If you email over your code snippet, then we can compare that with ours over email.

Actipro Software Support

Posted 16 years ago by FinallyInSeattle
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Got it - switched to using an ImageBrush instead and it works. Thanks for all your assitance!
The latest build of this product (v24.1.5) was released 1 month ago, which was after the last post in this thread.

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