CODEWITHSUNDEEP
wpfxamlvisibility
Ali Fattahian
Ali Fattahian

Reputation: 495

Very weird logical error in WPF GridViewColumnHeader

I have custom treelistview and I put a checkbox in the first column of my treelistview. everything is ok but when I want to hide the checkbox column for other purpose (using variable SelectEnable) , it does not hide correctly(it hides but a blank area remains). This Problem happens when I load the data (I mean when treelistview is empty, the column is hidden). here is some pieces of my xaml:

<Style x:Key="checkboxColumnStyle"
       TargetType="GridViewColumnHeader">
  <Setter Property="Width"
          Value="0" />
  <Setter Property="Visibility"
          Value="Hidden" />

  <Style.Triggers>
    <DataTrigger Binding="{Binding RelativeSource={RelativeSource  AncestorType=UserControl},Path=SelectEnable}"
                 Value="False">
      <Setter Property="Visibility"
              Value="Hidden" />
      <Setter Property="Width"
              Value="0" />
    </DataTrigger>
    <DataTrigger Binding="{Binding RelativeSource={RelativeSource  AncestorType=UserControl},Path=SelectEnable}"
                 Value="True">
      <Setter Property="Visibility"
              Value="Visible" />
      <Setter Property="Width"
              Value="30" />
    </DataTrigger>
  </Style.Triggers>
</Style>

<DataTemplate x:Key="CellTemplate_checkBox">
  <CheckBox IsChecked="{Binding IsSelected}"
            VerticalAlignment="Center"
            Style="{DynamicResource checkboxStyle}"
            Tag="{Binding}"
            Checked="CheckBox_Checked"
            Unchecked="CheckBox_Checked" />
</DataTemplate>

<GridViewColumnCollection x:Key="gvcc">
  <GridViewColumn  CellTemplate="{StaticResource CellTemplate_checkBox}">

    <GridViewColumnHeader Style="{DynamicResource checkboxColumnStyle}"
                          MaxWidth="0">
      <CheckBox x:Name="chechBoxAll"
                Style="{DynamicResource checkboxStyle}"
                Checked="chechBoxAll_Checked"
                Unchecked="chechBoxAll_Checked" />
    </GridViewColumnHeader>
  </GridViewColumn>
  <!--Other Columns -->
</GridViewColumnCollection>

How can i fix this?

Upvotes: 0

Views: 132

Answers (1)

Jay
Jay

Reputation: 57959

You probably want Visibility.Collapsed instead of Visibility.Hidden.

Hidden means the element is there but cannot be seen (similar to Opacity of 0), whereas Collapsed causes the layout arrangement to happen as though the element does not exist (no width and no height).

Upvotes: 3

Related Questions