Resize From Maximise or Restore Not The Same As Resize From Edge Drag?

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I have a main window that contains a user control. The user control looks like this:

XML

<Grid x:Name="LayoutRoot" removed="White">
    <Grid.RowDefinitions>
        <RowDefinition Height="5*"/>
        <RowDefinition Height="75*"/>
        <RowDefinition Height="20*"/>
    </Grid.RowDefinitions>
    <Canvas Grid.Row="0" Background="AliceBlue" ClipToBounds="True" x:Name="TitleCanvas"/>
    <Canvas Grid.Row="1" Background="LightGreen" ClipToBounds="True" x:Name="DrawCanvas"/>
    <Canvas Grid.Row="2" Background="Pink" ClipToBounds="True" x:Name="KeyCanvas"/>
</Grid>

My main window has a SizeChanged event handler which redraws the user control. It all works fine if I resize the window by dragging the edges, but if I resize using maximise or restore my user control doesn't redraw properly.

If I refresh or manually resize after the maximise or restore, the control redraws properly, just not immediately following the maximise or restore.

What is going on?

Posted 21-Jan-14 17:19pm

Kyudos

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Comments

Varsha Ramnani 22-Jan-14 4:54am

I don't get why you are using SizeChanged event handler to redraw the user control?
Grid is a fluid layout type so if the parent window's size is changed then the usercontrol size also gets changed and is calculated according to the parameters in Grid...
& it works fine for me anyway i change the size without sizechanged event handler.
your usercontrol belongs to Main window where you have implemented SizeChanged event right?

Kyudos 22-Jan-14 14:37pm

This is just the framework for the control - the actual contents of each canvas are drawn in code, hence I need to redraw when changing size. The height and width of the control are bound to its containing element (a border), which lives in a grid in the main window. When the app opens (Normal Window) the control renders correctly (contents centered on the DrawCanvas). If I Maximise, the DrawCanvas content doesn't resize or recenter, if I then Restore the content again redraws incorrectly.

Varsha Ramnani 22-Jan-14 23:50pm

Why use border as a containing element why not another Grid or even stackpanel?

Kyudos 23-Jan-14 6:20am

Does it make any difference? Its only a border because that's what it was when I inherited it. Looked at this some more, it seems like the control still has the "normal" size when maximised, then gets the 'maximised' size when restored again.

Varsha Ramnani 23-Jan-14 9:32am

actually it doesn't matter if the border is in main grid...
what is the content that you are drawing on canvas using code?
I checked ActualHeight and ActualWidth of usercontrol at the time of SizeChanged it is new one with maximise/restore or draging to resize.
how are you calculating the size of the content being drawn on canvas?

Member 10497425 22-Jan-14 13:02pm

Dont understand your question! Did you ask how the grid becomes bigger/smaller if the form does?

Kyudos 22-Jan-14 14:38pm

No, I'm asking what is different about Maximising or Restoring the window vs resize via drag. The drag resize causes my control to redraw correctly, the window operations don't.

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