Visibility of ListboxItem according to ContentPresenter (2023)

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  I have the following styles for the ListboxItem:

  < br/>

  尽管这是命名样式,但它适用于应用程序Gebruik ListboxItem。

  Gebruik de lijst van ListboxItems om ListboxItem

  te gebruiken, gebruik ze om DataTrigger te gebruiken这是不对的。如果

  Terug naar IsVisible

  
  

  因此，当 LayoutControl变时，ListboxItem 却没有。这就是我在样式中创建 DataTrigger 的原因Gebruik DataTrigger, ListboxItem en DataTrigger, gebruik LayoutControl en ListboxItem？

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  2013 6η 11η Σεπτεμβρίου 2013 2:14

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  Create the custom control and use the VisualTreeHelper to collapse the ListBoxItem

  See the code snippet below

  int number of children = VisualTreeHelper.GetChildrenCount();

  for( int i = 0; i

  {

  VisualTreeHelper.GetChild[i].Visibility = visibility.collapsed

  }

  Tuesday, June 11, 2013 at 2:33 PM

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  Hey, there must be a better way (I hope).

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  Tuesday, June 11, 2013 at 2:58 pm

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  You can use a DataTrigger to check if the ContentPresenter is ActualHeight 0.0 to see if the content is collapsible.

  • auteur Jay Chu Tuesday, June 11, 2013 at 3:31 pm

  Tuesday, June 11, 2013 at 3:31 pm

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  It helps, but not changing IsVisible:

  private void LayoutVisibilityChanged(Guide id) { var layout = Layouts.First(l => l.Id == id); layout.IsVisible = !layout.IsVisible; }

  
  

  LayoutControl Visibility is set to Visible when IsVisible is set to True, but there is no ListboxItem

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  Tuesday, June 11, 2013 at 4:31 pm

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  Hello choppers.

  I know you have Blend, so have you tried using ChangePropertyAction and binding a condition to visibility or Boolean or something?

  It may not be the prettiest solution, but it works...

  < SampleData:SampleDataSource x:Key="SampleDataSource" d:IsDataSource="True"/>
   

  I've uploaded a sample project to my Skydrive if you want to see how I set up the actions and conditions.

  I set up the second picklist to test the value changes.

  ~ Kristina

  sample...http://sdrv.ms/16bRz7k
  

  • auteur Christine L._ Wednesday, June 12, 2013 at 6:03 am

  Wednesday, June 12, 2013 at 5:58 am

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  Hello Christine. I looked at your example and it still uses the constrained elements property. I hope not to use this one. It works with DataTrigger, but like we said, it's not a good idea.

  And I've never heard of ChangePropertyAction. I really need to watch some Blend videos, hehe. I subscribe to pluralsight and they have what I need (mix for developers).

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  Wednesday, June 12, 2013 at 12:17 p.m

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  This is data that does not use…http://sdrv.ms/12FJD0qBrands based on content height as suggested by J. Chase. But plugin 2 will collapse or appear depending on the display height of the content.

  In my example it is just a check box in a user control. Controlled height is 50, uncontrolled height is 20.

  So when you open your project in Blend, right-click the dropdown > Edit Other Templates > Edit Generated Item Container (ItemContainerStyle).

  With the template open, select the outline (Bd) in the Objects and Timeline panel.

  Select your item box. Click Behavior > ChangePropertyAction and double click to add it.

  Your buildings will look like this in practice...

  

  Click the New button next to TriggerType and change it to PropertyChangedTrigger.

  Expand conditions and click the plus sign to add conditions.

  Click the AdvanceOptions button for the first value (the lil button on the right) and select Element Property Binding. Then click on the content presenter and select ActualHeight from the drop-down menu.

  Set the second value to 0, mine to 20 since I checked.

  Select the property you want to change...Visibility. Then set the value to folded.

  Repeat the process, but make it visible when it is 50 or more than 20. You can also just copy and paste actions from the Object and Timeline panel and then adjust the newly pasted settings.

  

  Therefore, they are quite easy to install and you can use many built-in activation rules.

  ~ Kristina

  • auteur Christine L._ Wednesday, June 12, 2013 at 1:42 PM
  • mark as answer Joba DinizMeer Wednesday, June 12, 2013 at 6:45 p.m

  Wednesday, June 12, 2013 at 1:37 PM

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  Sorry, I forgot a step. After changing the trigger type, click the target icon in the binding box, select the content presentation and select the actual height property from the drop-down list so that it knows which property to watch for changes. ~ Christina

  Wednesday, June 12, 2013 at 1:56 PM