Develop Reference

gridview column auto size not working on loading except with hot reload

When I load my list, my column size is set to "auto". I would like my column to automatically take the size of my longest string, so as not to "cut" the strings.
For the first column, we see that everything is fine. For the second one, which is exactly the same except for the font style, it doesn't work, we see that the names are cut.
However, if I change "auto" to a value, for example 10, and then back to "auto", everything works with an horizontal scrollbar:
If it works with hot reload and for the first column, what can explain that my second column does not fit the size of my strings?
My list is a collection of objects composed with 2 strings. My code :
<ListView
BorderBrush="SteelBlue"
ItemsSource="{Binding ListeAgentsAAfficher}"
SelectedItem="{Binding AgentSelected}">
<ListView.ContextMenu>
<ContextMenu>
<MenuItem
Command="{Binding AfficherSupprimerCommand}"
Header="Afficher agents supprimés"
IsCheckable="True"
IsChecked="{Binding IsCheckedSupprimer}" />
<MenuItem
Command="{Binding TriAgentsMatriculesCommand}"
Header="Trier par matricules"
IsCheckable="True"
IsChecked="{Binding IsCheckedTriMatricule}" />
<MenuItem
Command="{Binding TriAgentsNomCommand}"
Header="Trier par noms"
IsCheckable="True"
IsChecked="{Binding IsCheckedTriNom}" />
</ContextMenu>
</ListView.ContextMenu>
<ListView.Resources>
<Style TargetType="ListViewItem">
<Setter Property="Background" Value="White" />
<Style.Triggers>
<DataTrigger Binding="{Binding Supprimer}" Value="true">
<Setter Property="Foreground" Value="DarkOrange" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListView.Resources>
<ListView.View>
<GridView>
<GridView.ColumnHeaderContainerStyle>
<Style TargetType="GridViewColumnHeader">
<Setter Property="Visibility" Value="Collapsed" />
</Style>
</GridView.ColumnHeaderContainerStyle>
<GridViewColumn Width="auto">
<GridViewColumnHeader />
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock
HorizontalAlignment="center"
VerticalAlignment="center"
FontSize="10"
FontWeight="Bold"
Text="{Binding Matricule}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="auto">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock
HorizontalAlignment="center"
VerticalAlignment="center"
Text="{Binding Nom}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>

How can I group GridViewColumns in WPF, so the expander fills the whole width

I am new to WPF and try to do the following:
I have a ListView with a ItemsSource using a ViewModel.
Inside, there is a GridView with Columns. Each Column represents a Preoperty of the View Model. But the Description is optional and can be rather long. So I want to use a Expander. My Problem is, that I can only manage the expander to be as big as the Name-Column. But I want the expander to be as big as the whole row.
Here are 2 Images to clarify what I want.
My current State:
https://i.stack.imgur.com/ZNA4v.png
What I want to achieve:
https://i.stack.imgur.com/ZmFq1.png
I tried "grouping the GridView" but without success... See here
http://technico.qnownow.com/grouping-gridview-wpf/
Here's my Code
<Window ...>
<Window.Resources>
...
</Window.Resources>
<DockPanel>
<StackPanel DockPanel.Dock="Top">
...
</StackPanel>
<Grid>
<ListView Grid.RowSpan="4" DockPanel.Dock="Top" Margin="10" ItemsSource="{Binding MyView}">
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="BorderBrush" Value="Black"></Setter>
<Setter Property="BorderThickness" Value="0,0,0,1"></Setter>
<Setter Property="Focusable" Value="False" />
<Setter Property="HorizontalAlignment" Value="Stretch" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Setter Property="VerticalAlignment" Value="Top"></Setter>
<Setter Property="VerticalContentAlignment" Value="Top"></Setter>
</Style>
</ListView.ItemContainerStyle>
<!-- New GridView -->
<ListView.View>
<GridView>
<!--Number-->
<GridViewColumn Header="#">
<GridViewColumn.CellTemplate>
<DataTemplate DataType="viewModel:MyViewModel">
<TextBlock Text="{Binding Model.Number, StringFormat='#{0}', Mode=OneWay}"
Width="20" TextAlignment="Left" Margin="5" VerticalAlignment="Top" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<!--ErrorLevel-->
<GridViewColumn Header="" Width="45">
<GridViewColumn.CellTemplate>
<DataTemplate DataType="viewModel:MyViewModel">
<Image Source="{Binding Model.ErrorLevel, Converter={StaticResource ErrorLevelToImageConverter}, Mode=OneWay}"
ToolTip="{Binding Model.ErrorLevel, Mode=OneWay}" Width="20" Margin="5" VerticalAlignment="Top" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<!--ID-->
<GridViewColumn Header="ID">
<GridViewColumn.CellTemplate>
<DataTemplate DataType="viewModel:MyViewModel">
<TextBlock TextAlignment="Center" Margin="5" Width="50" VerticalAlignment="Top" >
<Hyperlink NavigateUri="{Binding Model.Hyperlink, Mode=OneWay}"
Command="{Binding HyperlinkCommand}">
<TextBlock Text="{Binding Model.Id, Mode=OneWay}" />
</Hyperlink>
</TextBlock>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<!--Name-->
<GridViewColumn Header="Name" Width="500" >
<GridViewColumn.CellTemplate>
<DataTemplate DataType="viewModel:MyViewModel">
<Expander ToolTip="Expand" ExpandDirection="Down" Foreground="Black" VerticalAlignment="Top">
<Expander.Header>
<TextBlock Text="{Binding Model.Name, Mode=OneWay}"
HorizontalAlignment="{Binding HorizontalAlignment, RelativeSource={RelativeSource AncestorType=ContentPresenter}, Mode=OneWayToSource}"
TextAlignment="Left" Margin="5" TextWrapping="Wrap" VerticalAlignment="Top" />
</Expander.Header>
<GroupBox Header="Description" FontWeight="Bold" >
<TextBlock Text="{Binding Model.Description, Mode=OneWay}" TextWrapping="Wrap"
FontWeight="Normal" TextAlignment="Left" Margin="5" />
</GroupBox>
</Expander>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<!-- Module-->
<GridViewColumn Header="Module" >
<GridViewColumn.CellTemplate>
<DataTemplate DataType="viewModel:MyViewModel">
<TextBlock Text="{Binding Model.Module, Mode=OneWay}"
TextAlignment="Center" Margin="5" Width="100" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
</DockPanel>
Once again, i am new to WPF, MVVM, DataBinding and all this. So please try to make your answer as detailed as possible. I tried many things, but they didn't work out.

You could add the following GridViewColumn at the left side (top in XAML) to your GridView
<GridViewColumn Header="" Width="30">
<GridViewColumn.CellTemplate>
<DataTemplate DataType="viewModel:MyViewModel">
<Expander Margin="-5,2,-5000,0" HorizontalAlignment="Left" Width="{Binding Path=ActualWidth, RelativeSource={RelativeSource AncestorType={x:Type ItemsPresenter}}}">
<GroupBox Header="Description" FontWeight="Bold" Margin="0,0,5,0">
<TextBlock Text="{Binding Model.Description}" FontWeight="Normal" TextWrapping="Wrap" />
</GroupBox>
</Expander>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
This is GridViewColumncontains an empty Header which simply shows the Expander-Arrow in the GridViewRows.
The Expander itself is left aligned and has a huge negative Margin on the right side, so it can draw its content outside of the right boundary. The width is set to the ActualWidth of the ItemsPresenter of your GridView. With this Width you can limit the content to the current visible Width of the GridView (Or you can set it to an absolute value like 500).
And finally a preview of this Column

OK, the fact that the expander is not stretchable is because of the non stretchable parent control. You have a column 'Name' in your gridview with a fixed width and a expander added as a child. As far as i know the child control cannot extend beyond the parent control if this is not truth im sure someone will correct this. I don't know what the best way is to achieve your goal but to give you some inspiration i made a small example.
So, to give you a example if how this could work:
Edit: You can just set negative margins on your expander like so:
<Expander ToolTip="Expand" ExpandDirection="Down" Margin="-100,0,-300,0" Foreground="Black" VerticalAlignment="Top">
Thanks to #LittleBit for this tip.
<ListView x:Name="lsttest" ItemsSource="{Binding persons}">
<ListViewItem>
<StackPanel>
<ListView>
<ListView.View>
<GridView>
<GridViewColumn Header="#1" Width="50">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"
Width="20" TextAlignment="Left" Margin="5" VerticalAlignment="Top" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Test 2" Width="50">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"
Width="20" TextAlignment="Left" Margin="5" VerticalAlignment="Top" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
<Expander ToolTip="Expand" ExpandDirection="Down" Foreground="Black" VerticalAlignment="Top">
<Expander.Header>
<TextBlock Text="{Binding Model.Name, Mode=OneWay}"
HorizontalAlignment="{Binding HorizontalAlignment, RelativeSource={RelativeSource AncestorType=ContentPresenter}, Mode=OneWayToSource}"
TextAlignment="Left" Margin="5" TextWrapping="Wrap" VerticalAlignment="Top" />
</Expander.Header>
<GroupBox Header="Description" FontWeight="Bold" Width="{Binding ActualWidth, ElementName=lsttest}">
<TextBlock Text="{Binding Name, Mode=OneWay}" TextWrapping="Wrap"
FontWeight="Normal" TextAlignment="Left" Margin="5" />
</GroupBox>
</Expander>
</StackPanel>
</ListViewItem>
</ListView>
The result:

WPF How to change the color of a gridviewcolumn

To preface the bulk of the question, I've found several answers regarding CellTemplate and DataTemplate, as well as one setting HeaderContainerStyle, and none of them worked; results ranged from no change to a crash.
I'm trying to change the color of the first entry in each column for my listview (basically so the header for each column sticks out). Here's the most recent thing I've tried with no success. Any suggestions or advice are greatly appreciated.
<ListView Height="380" VerticalAlignment="Top" HorizontalContentAlignment="Stretch">
<ListView.View>
<GridView>
<GridViewColumn Header="First" Width="60" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock x:Name="Txt" Text="{Binding First}" Background="DarkBlue"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Last" Width="60" DisplayMemberBinding="{Binding Last}" />
<GridViewColumn Header="Group" Width="80" DisplayMemberBinding="{Binding Group}" />
</GridView>
</ListView.View>
</ListView>

Is the following code what you are looking for?
For the first row:
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock x:Name="Txt" Text="{Binding First}"/>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource PreviousData}}" Value="{x:Null}">
<Setter TargetName="Txt" Property="Background" Value="DarkBlue"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</GridViewColumn.CellTemplate>
For the header:
<GridViewColumn Header="First" Width="60" >
<GridViewColumn.HeaderContainerStyle>
<Style TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="Background" Value="LightSkyBlue"/>
</Style>
</GridViewColumn.HeaderContainerStyle>
</GridViewColumn>

How to get ListView SelectedItem while editing?

I'm trying to save record when combination of keys pressed Ctrl + S.
Below code works fine only when i exit TextBox and select line then press Ctrl + S.
How to SelectItem without exiting TextBox? For example: typing text >> Ctrl + S >> continue typing.
Here is my code:
if (Keyboard.IsKeyDown(Key.LeftCtrl) && Keyboard.IsKeyDown(Key.S))
{
sql.saveSoftwareChanges(_list.SelectedItem as Software);
e.Handled = true;
}
and XAML:
<ListView x:Name="_list" Visibility="Visible" KeyDown="_list_KeyDown">
<!--RESOURCES-->
<ListView.Resources>
<Style TargetType="ListViewItem">
<Style.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="true">
<Setter Property="IsSelected" Value="true" />
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" Value="#FFFFFF9A" />
</Trigger>
</Style.Triggers>
</Style>
</ListView.Resources>
<!--/RESOURCES-->
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button x:Name="_save" Content="Save" MinWidth="20" Width="AUTO" Click="_save_Click" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Product ID">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding productId}" MinWidth="20" Width="AUTO" Padding="2"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Product">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding product}" MinWidth="20" Width="AUTO" Padding="2"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Path">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding path}" MinWidth="20" Width="AUTO" Padding="2"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Master Path">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding master_path}" MinWidth="20" Width="AUTO" Padding="2"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Parameters">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding parameters}" MinWidth="20" Width="AUTO" Padding="2"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Windows Version">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding windowsVersion}" MinWidth="20" Width="AUTO" Padding="2"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>

After a lot of research and trial and error I've got the solution.
It's as simple as moving out of that field, which can be achieved by:
MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
and entire method looks like:
if (Keyboard.IsKeyDown(Key.LeftCtrl) && Keyboard.IsKeyDown(Key.S))
{
var uie = e.OriginalSource as UIElement;
uie.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
sql.saveSoftwareChanges(_list.SelectedItem as Software);
uie.Focus();
e.Handled = true;
}
I hope that will help others as well.

You have to place your save code in a function then call this function from any control that may have the focus at that time. (i.e. the text box as well).
Remember that keyboard events only fire when the corresponding control has focus.
Test this:
<ListView x:Name="_list" Visibility="Visible" KeyDown="_list_KeyDown">
<!--RESOURCES-->
<ListView.Resources>
<Style TargetType="ListViewItem">
<Style.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="true">
<Setter Property="IsSelected" Value="true" />
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" Value="#FFFFFF9A" />
</Trigger>
</Style.Triggers>
</Style>
</ListView.Resources>
<!--/RESOURCES-->
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button x:Name="_save" Content="Save" MinWidth="20" Width="AUTO" Click="_save_Click" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Product ID">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding productId}" MinWidth="20" Width="AUTO" Padding="2" KeyDown="_list_KeyDown"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Product">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding product}" MinWidth="20" Width="AUTO" Padding="2" KeyDown="_list_KeyDown"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Path">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding path}" MinWidth="20" Width="AUTO" Padding="2" KeyDown="_list_KeyDown"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Master Path">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding master_path}" MinWidth="20" Width="AUTO" Padding="2" KeyDown="_list_KeyDown"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Parameters">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding parameters}" MinWidth="20" Width="AUTO" Padding="2" KeyDown="_list_KeyDown"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Windows Version">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding windowsVersion}" MinWidth="20" Width="AUTO" Padding="2" KeyDown="_list_KeyDown"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>

Button Will Not Fire from Style

Yeah, im not sure what i have done. brain feels like swiss cheese
<Window.Resources>
<Style TargetType="{x:Type Button}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Command" Value="{Binding CommandButtonClicked}"/>
<Setter Property="CommandParameter" Value="{Binding Mode=OneWay, RelativeSource={RelativeSource Self}}"/>
</Style>
</Window.Resources>
Button that will Fire.
<Grid DockPanel.Dock="Top">
<TextBox BorderBrush="Transparent" BorderThickness="0" x:Name="txtInput" Padding="50,10,15,15" AcceptsReturn="True" TextChanged="txtInput_TextChanged" TextWrapping="Wrap" Foreground="Crimson" Text="{Binding UserInput, Mode=TwoWay}" Background="Transparent"/>
<Button Width="30" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,3,0,0">
<Image Source="Images/Actions list add user.ico" />
</Button>
</Grid>
Buttons that will not fire
<ListView x:Name="ListViewUsers" ItemsSource="{Binding UserNames}" DockPanel.Dock="Top" Foreground="Green" BorderBrush="Transparent">
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.HeaderTemplate>
<DataTemplate>
<Button Margin="3,0,3,0" Width="30">
<Image Source="Images/Actions user group delete.ico"/>
</Button>
</DataTemplate>
</GridViewColumn.HeaderTemplate>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button>
<Image Source="Images/Actions list remove user.ico" Width="25"/>
</Button>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="User ID" DisplayMemberBinding="{Binding}"/>
</GridView>
</ListView.View>
</ListView>
i have also tried adding in a separate DelegateCommand per button, but that doesnt help either. it seems to be anything that inside this ListView and is Generated at runtime after the initial render will not fire.
any ideas ?

In the "cell" DataTemplate it will have its DataContext set to the "item" within the data collection assigned to the ListView for which the "look" is being provided i.e. a "username".
But your style is using a binding that needs to access the object that contains the "CommandButtonClicked" property.
Thus you need a way to get back to the DataContext that is holding your "CommandButtonClicked" property.....so assuming you had set your "ViewModel" onto your Windows DataContext you could do this...
<ListView x:Name="ListViewUsers" ItemsSource="{Binding UserNames}" DockPanel.Dock="Top" Foreground="Green" BorderBrush="Transparent">
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.HeaderTemplate>
<DataTemplate>
<Button Margin="3,0,3,0" Width="30" DataContext="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}},Path=DataContext}">
<Image Source="Images/Actions user group delete.ico"/>
</Button>
</DataTemplate>
</GridViewColumn.HeaderTemplate>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button DataContext="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}},Path=DataContext}">
<Image Source="Images/Actions list remove user.ico" Width="25"/>
</Button>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="User ID" DisplayMemberBinding="{Binding}"/>
</GridView>
</ListView.View>
</ListView>
There are alternative ways to do what you are doing...just one suggestion...look up routed commands (you could define one and then use it in your style e.g. Command="{x:Static mynamespace::MyCommands.DoSomething}" and then set up a CommandBinding to handle them).