How can I make a UIElement show after collapse in upper direction?

Question

On my form, I have a TextBlock element that initially is collapsed. (TextBlock.Visibility = Visibility.Collapsed). When some error occurred, it should be shown. When I use TextBlock.Visibility = Visibility.Show, all the controls that are situated under the TextBlock, are getting down.

Question: How to dock all the elements that are situated under this TextBlock in such a way that in case when the TextBlock is shown, to lift the upper elements?

When a control grows the Window or Page makes room the right and bottom. I don't think there is a way to change that behavior. — paparazzo, Mar 17 '12 at 12:59
There is, in a limited way, if you take advantage of vertical alignment — Charles Josephs, Mar 18 '12 at 05:56

score 1 · Answer 1 · edited Sep 11 '13 at 02:00

1

One way to achieve that is through strategic use of the VerticalAlignment property. Consider the following snippet. If this stackpanel is in a container where it has room to grow, it will grow upwards. When you toggle the visibility on the middle textblock, then, it will push the elements above it.

<StackPanel VerticalAlignment="Bottom">
    <TextBlock>I shift upward</TextBlock>
    <TextBlock Visibility="Collapsed">Error message here</TextBlock>
    <TextBlock>I stay put</TextBlock>
</StackPanel>

edited Sep 11 '13 at 02:00

Dave Clemmer

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answered Mar 18 '12 at 05:53

Charles Josephs

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But that mean leaving empty space to grow. So now real estate is actually gained by the Collapsed. Still +1. – paparazzo Mar 18 '12 at 13:32
Thank you very much. It works. I forgot about the default values of VerticalAlignment. – VladimirBadiuk Mar 19 '12 at 07:50

score 0 · Answer 2 · edited Sep 11 '13 at 02:00

0

I am not sure exactly what your question is, but if you do not want the other controls to move when the TextBlock becomes visible then it should start with Visibility.Hidden.

edited Sep 11 '13 at 02:00

Dave Clemmer

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answered Mar 17 '12 at 11:11

Doug Ferguson

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Yes, but I don't want to keep the layout space for this TextBlock, I want to keep it collapsed. – VladimirBadiuk Mar 17 '12 at 11:13
Well I don't understand what it would look like to lift the upper elements as you say in your question. – Doug Ferguson Mar 17 '12 at 14:06

How can I make a UIElement show after collapse in upper direction?

2 Answers2