I am working in WPF C# and noticed that my expander will expand and collapse when when I click on the button or header (words) of the expander but will not expand when I click on the part of the expander beside the header.
The weird part is that it will collapse the expander when clicking on the same spot beside the expander.
So does anyone know how to allow the entire expander to be clicked on to expand and collapse it?
Any help is greatly appreciated!
<Expander ExpandDirection="Down" Width="Auto" Padding="4" Expanded="Expander_Expanded">
<Expander.Style>
<Style TargetType="Expander">
<!--<Setter Property="IsExpanded" Value="{Binding XPath=#Name, Converter={StaticResource ExpandConverter}}" />-->
<Setter Property="IsExpanded" Value="{Binding XPath=#Expand}" />
<Setter Property="Header">
<Setter.Value>
<MultiBinding Converter="{StaticResource NameConverter}">
<Binding XPath="#Name" />
</MultiBinding>
</Setter.Value>
</Setter>
<Setter Property="FontWeight" Value="Bold" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsExpanded,RelativeSource={RelativeSource Self}}" Value="True">
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Style>
<ListBox Name="itemsList"
ItemsSource="{Binding XPath=UpgradeAction}"
ItemTemplate="{StaticResource dtListItemTemplate}"
SelectionChanged="listItems_SelectionChanged"
Style="{StaticResource styleListBoxUpgradeAction}"
ItemContainerStyle="{StaticResource styleListBoxItemUpgradeAction}"
MouseDoubleClick="itemsList_MouseDoubleClick">
</ListBox>
</Expander>
Have a look at the controltemplate perhaps? You could also use a click event and see if the mouse is on the header part and make it a reusable Behavior.
The problem was that the width of the expander was not set, so it was auto. Therefore it worked when it was closing because the width, when opened, is set to the entire expander. However, it didn't work while collapsed because when collapsed, the expander width is only set to as far as the header goes. Thus, I changed the width to a fixed value and it allowed me to press anywhere on the top part of the expander to open and close it.
Related
I have a TabControl in my Control with in each tab a DataGrid. I am styling the tab header using a template. I would like to bind to the DataGrid.ItemsSource on the tab to be able to apply a filter to add an image to the TabItem indicating a status.
Below is my VisualTree with an arrow indicating the binding:
And this is my template with the relative binding, which unfortunately is not working.
<DataTemplate x:Key="TabItemHeaderWithIconTemplate">
<StackPanel Orientation="Horizontal">
<Image>
<Image.Style>
<Style TargetType="{x:Type Image}">
<Style.Triggers>
<DataTrigger
Value="True"
Binding="{Binding Path=ItemsSource, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Converter={StaticResource StatusHasFailureConverter}, Mode=OneWay}">
<Setter Property="Source" Value="/REDACTED;component/Resources/red-x-icon.png"/>
</DataTrigger>
<DataTrigger
Value="False"
Binding="{Binding Path=ItemsSource, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Converter={StaticResource StatusHasFailureConverter}, Mode=OneWay}">
<Setter Property="Source" Value="/REDACTED;component/Resources/green-checkmark-icon.png"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
<TextBlock Text="{Binding}" />
</StackPanel>
</DataTemplate>
If I remove the relative binding and directly bind to a CollecionViewSource defined in my resources the StatusHasFailureConverter is triggered and the icon is visible and matches the output of my converter, but with my relative binding no icon appears at all, the converter seems not to be triggered, but also no binding issues are raised.
Any pointers on how to define the binding to point to the topmost DataGrid ItemsSource in the TabControl (indicated with the arrow)?
It seems because of the way TabControl works, the contents of tabs are not children of their items (only the headers are children of the individual items). This means a relative binding would not be possible as far as I can tell. I would instead recommend binding the DataGrid and TabItem header to he same common source, which it seems you've already figured out how to do.
in my WPF application I have a listview that only appears if a bound item has an values, this works like so
<ListView Grid.Row="1" Grid.Column="1" Margin="0,5,0,20" BorderThickness="0"
ItemContainerStyle="{StaticResource SelectionlessListViewItemStyle}"
ItemsSource="{Binding MissingAssets}">
<ListView.Style>
<Style TargetType="ListView">
<Style.Triggers>
<Trigger Property="HasItems" Value="False">
<Setter Property="Visibility" Value="Collapsed"></Setter>
</Trigger>
</Style.Triggers>
</Style>
</ListView.Style>
So this will only display the listview if MissingAssets has any values and works fine, above that I wanted a textblock as a header to just say "The following assets could not be found", and I want to hide this text of course if this listview is hidden too, I tried implementing it like this
<TextBlock Grid.Row="0" Grid.Column="1" VerticalAlignment="Center" FontWeight="Bold" Text="The following assets could not be found">
<TextBlock.Style>
<Style TargetType="{x:Type TextBlock}">
<Style.Triggers>
<DataTrigger Binding="{Binding MissingAssets}" Value="">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
But for some reason it won't hide even if MissingAssets is empty, I've tried using several different things in Value="" but nothing gets it to work. Is there a property or something I'm forgetting to set?
Thanks
You have many options here. The simplest should be to bind the TextBlock.Visibility to the ListView.Visibilty:
<StackPanel>
<TextBlock Visibility="{Binding Elementname="MissingAssetsListView", Path="Visbibility" />
<ListView x:Name="MissingAssetsListView" />
</StackPanel>
Found a workaround, I created a new string property in my C# code that remains blank unless missing assents are found, if they are found I populate the string and bind that string to a label in my XAML, so if the string is empty then there will be no visible label on the UI
I have a treeview and a listbox.
I want to specify on the style trigger-setter option that, when the listbox visibility is Hidden the focus have to return on the treeview.
Is it possibile to condition an user control focus on the state of another user control?
something like
<Style TargetType="{x:Type TreeView}">
<Style.Triggers>
<Trigger Property="Visibility" Value="Hidden">
<Setter Property="IsFocus" Value="True" />
</Trigger>
</Style.Triggers>
</Style>
Yes it is, see the example here
FOR CHILDREN IN CONTAINERS
<StackPanel FocusManager.FocusedElement="{Binding ElementName=lol}">
<TextBox x:Name="lol"/>
<TextBox x:Name="lul"/>
</StackPanel>
FOR SELF
<TextBox FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"/>
I'm quite new to WPF and MVVM and I'm trying to create a custom WindowChrome with all the standard Window features. I'm struggling with the Maximize/Minimize window Button content: I want the content to change when the user double clicks the WindowChrome bar, in order to show the right icon:
When I double click the bar, the result should be:
I managed to change the content with the Button Triggers, but how can I change it when another control event occurs?
Thanks in advance for the help!
Give the Button a Style with triggers that set the content based on the value of Window.WindowState. This isn't an event. The button reflects the current state of the window.
<Style TargetType="Button">
<Style.Triggers>
<DataTrigger
Binding="{Binding WindowState, RelativeSource={RelativeSource AncestorType=Window}}"
Value="Maximized">
<Setter Property="Content">
<Setter.Value>
<!-- I don't know if you're using a Path or what -->
<Path Stroke="White" Data="..." />
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger
Binding="{Binding WindowState, RelativeSource={RelativeSource AncestorType=Window}}"
Value="Normal">
<Setter Property="Content">
<Setter.Value>
<!-- I don't know if you're using a Path or what -->
<Path Stroke="White" Data="..." />
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
It would be wiser to set the Template of the button instead, because there’s only one copy of each of those Paths, and if you reuse the style twice, they can’t be shared.
If there's some reason why this won't work with your code, show me your code.
I created a DataGrid shown in the image above, which has extra unused space in the right part.
Could you tell me how it is possible to remove lines in the unused space?
CAUTION: In my case, the extra unused space MUST exist in the right part. I'd like to remove lines alone.
SOLUTION:
I resolved my question by setting GridLinesVisibility="NONE" and setting a template for a DataGridCell as shown in the code below. Thank you very much for your help, everyone.
<Style TargetType="DataGridCell">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border BorderBrush="Black" BorderThickness="0, 0, 0.5, 0.5"
Background="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Background}">
<ContentControl Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content}"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
set GridLinesVisibility="Vertical" on the datagrid, and then override the cellstyle:
<DataGrid.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="BorderThickness" Value="0,0,0,1"/>
</Style>
</DataGrid.CellStyle>
which will set the border on each cell to only the bottom border, and each column will have vertical grid lines displayed only.
You can remove extra rows by using CanUserAddRows property. Also you can remove extra created column by using AutoGenerateColumns property.
<DataGrid CanUserAddRows="False" AutoGenerateColumns="False">
.................
</DataGrid>