I've got an ItemsControl which fills from top to bottom, but I can't get it's child items to occupy the whole width of the ItemsControl:
I basically need to stretch the green bits to fill the width of the control (as shown by the blue bits).
I've tried things like setting the HorizontalAlignment property of the template item to Stretch and I've even tried binding it's Width property to the ItemsControl Width, but neither worked.
Should be a straight forward one, but it's something I just can't quite figure out...
Edit: here's the ItemTemplate (the whole thing is the ItemTemplate which itself contains an ItemsControl which is bound to a list of child objects):
<DataTemplate>
<Border CornerRadius="5" Background="#ddd">
<StackPanel>
<TextBlock Text="{Binding Name}" FontSize="18" Foreground="#bbb"/>
<ItemsControl ItemsSource="{Binding PlugIns}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel HorizontalAlignment="Stretch" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Margin="10,0,10,10" Tag="{Binding}"
MouseEnter="StackPanel_MouseEnter">
<Border Child="{Binding Icon}" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</Border>
</DataTemplate>
You need to configure the ListBoxItem HorizontalContentAlignment, you do this by using a Style object in the ListBox ItemContainerStyle as follows:-
<ListBox ....>
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ListBox.ItemContainerStyle>
OK, so as I continued to build the app up, I figured out how to resolve this. Essentially, when I changed the template of the ItemsControl to support scrolling, the items spanned to fill horizontally :)
<ItemsControl>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer Padding="{TemplateBinding Padding}">
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
...
</ItemsControl>
Related
I have a ListView as follows:
<ListView ItemsSource="{Binding SerialNumbers}" SelectionMode="Multiple" HorizontalAlignment="Stretch">
<ListView.ItemTemplate>
<DataTemplate>
<Border Background="Red" Padding="14 5" HorizontalAlignment="Stretch">
<TextBlock HorizontalAlignment="Stretch" Text="{Binding Number}" />
<behaviours:Interaction.Triggers>
<behaviours:EventTrigger EventName="MouseLeftButtonUp">
<behaviours:InvokeCommandAction Command="{Binding Path=DataContext.SerialNumberSelectedCommand, RelativeSource={RelativeSource AncestorType=UserControl}}" CommandParameter="{Binding}" />
</behaviours:EventTrigger>
</behaviours:Interaction.Triggers>
</Border>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
I want the Border to take the full width as the ListViewItem, but it is not happening. I've tried adding HorizontalAlignment="Stretch" to the ListView, Border, and the TextBlock. It isn't working. It currently looks like this.
How can I stretch the Border to get the full width of the ListViewItem.
I want to achieve this because I have a MouseLeftButtonUp event linked to the Border, which will call a command. As the Border is only the red part, it will only be called on clicking the red part. I want it to be called on clicking the total width of the ListViewItem.
In my opinion, the cleanest way to achieve it is to set HorizontalContentAlignment to the ListViewItem. You can easily achieve this using a style, like this:
<ListView>
<ListView.ItemTemplate>
<DataTemplate>
<Border Background="Red" >
<TextBlock Text="{Binding}"/>
</Border>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>
</ListView>
I have a listbox using UniformGrid for the ItemsPanelTemplate. It is a list of photos. I want the photos to be centered horizontally in the center of each cell of the grid, but it seems that no matter what I do, the images are aligned to the left of each cell. Here is my current XAML:
<Border BorderThickness="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" DockPanel.Dock="Right">
<ListBox Name="PhotosListBox" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Disabled">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid IsItemsHost="True" HorizontalAlignment="Center"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Image Source="{Binding Path=photo}" HorizontalAlignment="Center"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Border>
As you can see, I have the Image control in the DataTemplate set to HorizontalAlignment="Center", which I thought would do it, but it's not working.
What am I doing wrong?
You need to set HorizontalContentAlignment to Stretch to first allow ListBoxItems to stretch to all available space so that inline control can be aligned at centre accordingly.
<ListBox>
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListBox.ItemContainerStyle>
...
</ListBox>
I have something like this:
<ListBox ItemsSource="{Binding List}">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Property}" TextWrapping="Wrap" Grid.Column="0"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
And the problem I'm having is that the TextBlock will expand the Grid column (and the Listbox) when the text is too long, instead of wrapping it as expected. Maybe I don't understand the star-sizing concept of Grids completely, but the way I see it, since the column width is set to "1*" which means "the remaining space available", the Textblock should NOT try to expand beyond this width, and should wrap the text instead.
So how can I fix this problem? By the way, I need the Grid (or some other container) because there will be other components besides the Textblock. Also the ItemContainerStyle section is there so that the Listbox element occupies the whole space.
Thanks in advance!
Try to add ScrollViewer.HorizontalScrollBarVisibility="Disabled" to your ListBox.
you don't need column definitions if it will be just one, try with the following:
<ListBox ItemsSource="{Binding List}">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding Property}" TextWrapping="Wrap" HorizontalAlignment="Stretch"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I want to change a listview with a wrappanel inside into a listivew with a stackpanel inside, basically to switch between a "small image view" and a "details view".
Not sure the best way to do it though. What I have so far:
<UserControl.Resources>
<Style x:Key="ListBoxWrap" TargetType="ListBox">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ListBoxList" TargetType="ListBox">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<StackPanel />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<ListBox Style="{StaticResource ListBoxList}" Name="lstContacts" Background="White" Margin="7,0,7,7" Grid.Row="1" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<Border CornerRadius="4" Margin="5">
<StackPanel>
<TextBlock Text="{Binding FullName}" Margin="5,3,5,0" />
<TextBlock Text="{Binding Title}" Margin="5,0,5,3" />
</StackPanel>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
You should use a ListView for that, then you just need to swap out the ListView.View to change the appearance, the GridView already is a details-view, then you only need to create a view for the thumbnails.
To do so subclass ViewBase, there is an example in the documentation; creating a simple thumbnail view should not be very hard.
This approach has the advantage that it fully encapsulates the display-logic, so you should not need to swap out properties like ItemTemplate in addition to the panel.
You could also use a ItemTemplateSelector to modify the template based on a specific value change which could be (event) triggered by a mouse-over or click event.
All of this code would reside in the xaml and you would not need to create a separate class or custom control.
I have a collection of elements, each one with a name and a subcollection of image blobs.
I want to display an Accordion, with each item representing each of the MainElements. inside each element, I display the images in the subcollecion of said MainElement.
The Accordion gets resized by the user, so I use a wrappanel for presenting the images. When the accordion is wide enough, the images reorder themselves fitting as many as posible in each row.
the problem comes when the wrappanel only displays one image per row (because there's no space enough for more), the image list continues, but I can't see all the images, because they don't fit inside the control's height.
I need a vertical scrollbar to be displayed inside the AccordionItem so I can scroll down the image list.
So, here's my code:
<layoutToolkit:Accordion Width="Auto" Height="Auto" ItemsSource="{Binding MainElementCollection}">
<layoutToolkit:Accordion.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding MainElementName}" />
</DataTemplate>
</layoutToolkit:Accordion.ItemTemplate>
<layoutToolkit:Accordion.ContentTemplate>
<DataTemplate>
<ItemsControl ItemsSource="{Binding SubElementCollection}" ScrollViewer.VerticalScrollBarVisibility="Auto" >
<ItemsControl.Template>
<ControlTemplate>
<controlsToolkit:WrapPanel />
</ControlTemplate>
</ItemsControl.Template>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Image Margin="2" Width="150" Source="{Binding PreviewImage, Converter={StaticResource ImageConverter}}" />
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
</layoutToolkit:Accordion.ContentTemplate>
</layoutToolkit:Accordion>
http://www.silverlightshow.net/tips/How-to-add-scrollbars-to-ItemsControl.aspx suggests that I should surround my wrappanel with a scrollviewer, like this
<ItemsControl.Template>
<ControlTemplate>
<scrollviewer>
<controlsToolkit:WrapPanel />
</scrollviewer>
</ControlTemplate>
</ItemsControl.Template>
But then my wrappanel gets really small and I can only see a small vertical scrollbar
Any ideas?
Thanks a lot.
Edit: I figured thatthe wrappanel loses its width when used in the controltemplate
It should be used as follows:
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<controlsToolkit:WrapPanel ScrollViewer.VerticalScrollBarVisibility="Visible" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
Anyway, I tried adding the ScrollViewer.VerticalScrollBarVisibility="Visible" line but I'm stuck again.
Edited again:
Now my wrappanel looks like this:
<ItemsControl ItemsSource="{Binding StageVideos}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<controlsToolkit:WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Image Margin="2" Width="150" Cursor="Hand" MouseLeftButtonDown="videoPreview_MouseLeftButtonDown" Tag="{Binding}" Source="{Binding PreviewImage, Converter={StaticResource ImageConverter}}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer VerticalScrollBarVisibility="Visible">
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
</ItemsControl>
I'm using a wrappanel as the items panel, and I'm using the ControlTemplate to surround the presenter with a scrollviewer. Still, no luck :/
It's working perfectly. i had two different Accordions on the same page, and I was checking my code changes in the one whose code I wasn't touching.
Sometimes you need to pause, go for a walk and then look at the whole screen.
The right code is the last one:
<ItemsControl ItemsSource="{Binding StageVideos}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<controlsToolkit:WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Image Margin="2" Width="150" Cursor="Hand" MouseLeftButtonDown="videoPreview_MouseLeftButtonDown" Tag="{Binding}" Source="{Binding PreviewImage, Converter={StaticResource ImageConverter}}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer VerticalScrollBarVisibility="Visible">
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
</ItemsControl>