I have a WPF listbox which displays messages. It contains an avatar on the left side and the username and message stacked vertically to the right of the avatar. The layout is fine until the message text should word wrap, but instead I get a horizontal scroll bar on the listbox.
I've Googled and found solutions to similar issues, but none of them worked.
<ListBox HorizontalContentAlignment="Stretch" ItemsSource="{Binding Path=FriendsTimeline}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Border BorderBrush="DarkBlue" BorderThickness="3" CornerRadius="2" Margin="3" >
<Image Height="32" Width="32" Source="{Binding Path=User.ProfileImageUrl}"/>
</Border>
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Path=User.UserName}"/>
<TextBlock Text="{Binding Path=Text}" TextWrapping="WrapWithOverflow"/> <!-- This is the textblock I'm having issues with. -->
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Contents of the TextBlock can be wrapped using property TextWrapping.
Instead of StackPanel, use DockPanel/Grid.
One more thing - set ScrollViewer.HorizontalScrollBarVisibility property to Disabled value for the ListBox.
Updated Hidden to Disabled based on comment from Matt. Thanks Matt.
The problem might not be located in the ListBox. The TextBlock won't wrap, if one of the parent controls provides enough space, so that it hasn't the need to wrap. This might be caused by a ScrollViewer control.
If you want to prevent TextBlock to grow, and you want it to just fit in the size of the listbox, you should set the width of it explicitly.
In order to change it dynamically, it means not a fix value, but you need to bind it to its proper parent element in the visual tree. You can have something like this:
<ListBox ItemsSource="{Binding MyItems}" Name="MyListBox">
<ListBox.Resources>
<Style TargetType="ListBoxItem">
<Setter Property="Width"
Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ScrollContentPresenter}, Path=ActualWidth}" />
</Style>
</ListBox.Resources>
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Title}" TextWrapping="Wrap" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
If it does not work, try to find the proper elements (which has to be binded to what) with the Live Visual Tree in Visual Studio.
Related
I have a DataTemplate that I am using for a cell in a gridview. I would like to switch between the progress bar and the text/link block. Is there a way to hide an element so that it is removed from the flow and takes up no space while it is hidden (like "display:none" in CSS)? Is there a better way to approach this?
DataTemplate looks like:
<DataTemplate x:Key="DataTemplate2">
<StackPanel Height="40">
<TextBlock Visibility="{Binding ButtonVisibility}">
<Hyperlink Click="btn_Authorise">
<InlineUIContainer>
<TextBlock Text="{Binding Button}" />
</InlineUIContainer>
</Hyperlink>
</TextBlock>
<ProgressBar Value="{Binding Progress}"
Visibility="{Binding ProgressVisibility}"
Height="15"
Width="150"
Background="{DynamicResource NormalBrush}"
BorderThickness="0"
BorderBrush="#FF8D8D8D"
Style="{DynamicResource ProgressBarStyle1}" />
</StackPanel>
</DataTemplate>
Visibility.Collapsed is probably what you need (as opposed to Visibility.Hidden which still makes the control take part in layout calculations)
Also see the Visibility enumeration reference.
Yep.
Visibility is an enumeration, Visible, Hidden, and Collapsed.
Hidden is just non-visible, whereas Collapsed means it takes no space also
I'm facing an irritating problem with WPF GroupBox, hope someone can help me out. Basically the problem is this: I have a listview inside a GroupBox, but no matter what I do I can't seem to be able to make it fill the GroupBox.
Here is the basic code:
<GroupBox Grid.Row="2" Header="Field" Visibility="{Binding ElementName=radioUnbound, Path=IsChecked, Converter={StaticResource bool2vis}}" Margin="0" VerticalContentAlignment="Stretch">
<ListView ItemsSource="{Binding ElementName=nnf1, Path=UnboundFields}" x:Name="listUnbound" SelectionChanged="listSelectionChanged" VerticalAlignment="Stretch" >
<ListView.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding name}" Margin="2"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</GroupBox>
I tried encasing the list inside Grids, StackPanels, DockPanel, etc... but no matter what I try I always invariably end up with this:
I tried your code in XamlPad it works as you would expect it. Make sure you don't have global styles that set your ListView or GroupBox appearance.
You can clear global styles by putting this in the resources section of the GroupBox's parent control:
<Style TargetType="GroupBox" />
<Style TargetType="ListView" />
<DataTemplate x:Key="dirtSimple">
<TextBlock Margin="10,0,0,0" Text="{Binding Path=CurrentBook.Published, StringFormat=d}"></TextBlock>
</DataTemplate>
<ControlTemplate x:Key="lbWrapPanelTemplate">
<StackPanel Orientation="Horizontal" Margin="2" Background="Aqua">
<ItemsPresenter></ItemsPresenter>
</StackPanel>
</ControlTemplate>
...
<ListBox Template="{StaticResource lbWrapPanelTemplate}" x:Name="bookListBox" Grid.Row="0" ItemsSource="{Binding Path=BookSource}" ItemTemplate="{StaticResource dirtSimple}" >
</ListBox>
The list box is displaying correctly, with a beautiful "Aqua" background, and each item is boringly displayed with just a date. For some reason though the items are not flowing horizontally. I originally tried it with the Silverlight Toolkit's WrapPanel, with the same problem, but I can't even get it to work with a built-in StackPanel, so I suspect I'm missing something.
Are you trying to get selection-based behavior that a ListBox provides? If not, use an ItemsControl (and supply an ItemsPanel as below).
The reason it's not going horizontal is the ItemsPresenter ultimately has its own panel it lays out items in. It's not inserting each item separately into your StackPanel (or WrapPanel), it's putting them in its own panel
What you want to do is specify a value for ItemsPanel like so:
<ListBox ItemTemplate="{StaticResource dirtSimple}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
Ok, this is an embarassingly simple-looking problem, but is driving me crazy. I'm learning about DataTemplating and am trying to apply a very VERY simple ItemTemplate to a ListBox.
However, when I run my app, the template is completely ignored and I just get the standard-looking listbox, whereas in fact I'd expect to see a list of checkboxes with 'Test' along side.
I've tried this several times and always the same result. I've checked several resource on Google and all have the same kind of syntax for defining and ItemTemplate on a ListBox, so I really cannot see where I'm going wrong.
Code...
<Grid x:Name="LayoutRoot">
<ListBox x:Name="TestList"
SelectionMode="Multiple">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<CheckBox Content="Check this checkbox!"/>
<TextBlock>Test</TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Items>
<ListBoxItem>Bob</ListBoxItem>
<ListBoxItem>Jim</ListBoxItem>
<ListBoxItem>Dave</ListBoxItem>
<ListBoxItem>Larry</ListBoxItem>
<ListBoxItem>Tom</ListBoxItem>
</ListBox.Items>
</ListBox>
</Grid>
Any help greatly appreciated. Sorry for such a dumb-seeming question, but I've really fallen at the first hurdle here :(
AT
ItemTemplate wont work when you put ListBoxItem directly as items. General concept is you databind a CRL collection to the ListBox.ItemsSource and then specify the ItemTemplate. Check the below code.
<Grid x:Name="LayoutRoot">
<ListBox x:Name="TestList" SelectionMode="Multiple">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<CheckBox Content="Check this checkbox!"/>
<TextBlock Text="{Binding}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Items>
<sys:String>Bob</sys:String>
<sys:String>Jim</sys:String>
<sys:String>Dave</sys:String>
<sys:String>Larry</sys:String>
<sys:String>Tom</sys:String>
</ListBox.Items>
</ListBox>
</Grid>
where sys is xmlns:sys="clr-namespace:System;assembly=mscorlib"
In this way, there are 5 ListBoxItems getting generated in the background and added to the ListBox.
You can use ItemContainerStyle instead of ItemTemplate if you want to add ListBoxItems directly to the ListBox.
Doing so, however, is only recommended when you need unique characteristics on a per item level.
If you are planning on all the items looking the same or making a dynamic list using ItemsSource, I would recommend you add strings (or another custom object) to your list and use ItemTemplate to display your items. (see Jobi Joy's answer)
Here's an example using ItemContainerStyle:
<ListBox
x:Name="TestList"
SelectionMode="Multiple">
<ListBox.ItemContainerStyle>
<Style
TargetType="ListBoxItem">
<Setter
Property="Template">
<Setter.Value>
<ControlTemplate
TargetType="ListBoxItem">
<StackPanel>
<CheckBox
Content="Check this checkbox!" />
<TextBlock
Text="{TemplateBinding Content}" />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.Items>
<ListBoxItem>Bob</ListBoxItem>
<ListBoxItem>Jim</ListBoxItem>
<ListBoxItem>Dave</ListBoxItem>
<ListBoxItem>Larry</ListBoxItem>
<ListBoxItem>Tom</ListBoxItem>
</ListBox.Items>
</ListBox>
For some reason DataTemplate can still be ignored if the ListBox is populated using ItemsSource e.g:
<ListBox Name="Test" x:FieldModifier="public" ItemsSource="{Binding UpdateSourceTrigger=PropertyChanged}">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBox Text="{Binding Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Note that this is bound to an ObservableCollection containing objects (TextAdapter : INotifyPropertyChanged) with one property: string Text {...}
I have a ListBox with a StackPanel that contains an image and label.
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal" IsItemsHost="True" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical">
<Image Source="{Binding Image}" Cursor="Hand" Tag="{Binding Link}" MouseLeftButtonDown="Image_MouseLeftButtonDown" ToolTip="Click to see this product on adidas.com" VerticalAlignment="Top" HorizontalAlignment="Left" />
<Label Content="{Binding Name}" Cursor="Hand" Tag="{Binding Link}" MouseLeftButtonDown="Label_MouseLeftButtonDown" VerticalAlignment="Bottom" Foreground="White" Style="{StaticResource Gotham-Medium}" FontSize="8pt" HorizontalAlignment="Center" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
I want to show a third image (glow.png) behind the currently moused over image. I can't seem to add a second image to the stack panel, and set it's visibility to hidden. I haven't even tackled the mouseover part yet.
Is adding another image inside the stack panel, and then setting it's visibility to visible the right approach on mouseenter, and then swapping back on mouseleave?
Thanks.
You certainly can have one image behind another. Instead of directly adding the image to your StackPanel, add a Grid and then add both images, like this:
<StackPanel Orientation="Vertical">
<Grid>
<Image Source="..." />
<Image Source="{Binding Image}" ... />
</Grid>
<Label Content="{Binding Name}" ... />
</StackPanel>
You might also like to look into Bitmap Effects, using which you can introduce a "glow" effect onto any WPF element.
Edit: Another way to achieve the effect you want (I believe) is to swap out the image's Source property in a trigger. I'm not going to try to write the XAML from memory here, but you could catch the IsMouseOver property for the image itself, and when it switches to True you could set its Source to the "glowing" version of the image.
Another possibility is to add a border to your image, set the color of the borderbrush to whatever you want and the opacity to 0. In your MouseEnter event handler set the opacity to 1.