I have a Listbox, which is using an ItemTemplate to display an image. I want to be able to change the size of the displayed image in the ItemTemplate. Through databinding I can change the Width, but the only way I can see how to do this is to add a Property (Say, ImageSize) to the class I am binding to and then change every item in the collection to have a new ImageSize. Is there no way to access the property of an item in that Datatemplate?
E.g.
<navigation:Page.Resources>
<DataTemplate x:Key="ListBoxItemTemplate">
<Viewbox Height="100" Width="100">
<Image Source="{Binding Image}"/>
</Viewbox>
</DataTemplate>
</navigation:Page.Resources>
<Grid>
<ListBox ItemTemplate="{StaticResource ListBoxItemTemplate}" ItemSource="{Binding Collection}"/>
</Grid>
Is there anyway to set the Width and Height of the viewbox without binding a property to every element in the collection?
You can use element binding to this. Try something like this:
<UserControl.Resources>
<DataTemplate x:Key="ListBoxItemTemplate">
<Viewbox Height="{Binding Value, ElementName=slider1}"
Width="{Binding Value, ElementName=slider1}">
<Image Source="{Binding Image}"/>
</Viewbox>
</DataTemplate>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="205*" />
<RowDefinition Height="95*" />
</Grid.RowDefinitions>
<ListBox ItemTemplate="{StaticResource ListBoxItemTemplate}"
ItemSource="{Binding Collection}"/>
<Slider x:Name="slider1" Value="100" Maximum="250" Grid.Row="1"/>
</Grid>
If you know the sizes to which you'll be resizing, you could define a number of different ItemTemplates and switch bewteen them.
Related
I would like to make a UserControl which have a DataTemplate, and inside that DataTemplate there are controls. I would like to bind to those nested (inside the DataTemplate) controls' properties so I can set them when I reuse this UserControl. The nested controls will use the ItemSource's properties but the property names of the ItemSource's properties could be different.
The UserControl:
<UserControl x:Class="ContextMenu.BaseFilterUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
x:Name="Self">
<Grid Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="80" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="70" />
</Grid.RowDefinitions>
<TextBlock Grid.Column="0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Margin="10"
Text="Owners" />
<Button Grid.Column="1"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Margin="10"
Click="FilteButtonClicked"
Width="40"
Height="40"
x:Name="FilterButton">
<Popup x:Name="FilterBoxPopup"
PlacementTarget="{Binding ElementName=FilterButton}"
Placement="Bottom"
StaysOpen="False">
<Border BorderBrush="Black"
Background="White"
Margin="2">
<ListView ItemsSource="{Binding ElementName=Self, Path=FilterList}"
x:Name="FilterListView"
Height="300"
Width="150">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<!--<CheckBox IsChecked="{Binding IsChecked}" />-->
<!--<TextBlock Text="{Binding Name}" />-->
<!--This is where I don't know how to properly bind eg. the above control, things I tried:-->
<!--<TextBlock Text="{Binding ElementName=FilterListView, Path=FilterElementName}" />-->
<!--<TextBlock Text="{Binding ElementName=Self, Path=DataContext.FilterElementName}" />-->
<!--<TextBlock Text="{Binding ElementName=FilterListView, Path=DataContext.FilterElementName}" />-->
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Border>
</Popup>
</Button>
<TextBlock Grid.Column="3"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="10"
Text="{Binding ElementName=Self, Path=SelectedNames}" />
</Grid>
</UserControl>
This how the UserControl is used, the FilterElementName="Name" is what I would like to set, depending on the list binded with FilterList list:
<local:BaseFilterUserControl FilterList="{Binding Owners}"
FilterElementName="Name"
SelectedNames="{Binding SelectedNames}"/>
In this case the Owners is a simple IReadOnlyList of an Owner class. The Owner class has a string Name property. But I will use this UserControl again with different list eg. where I would like to use the Versions list's Release property (for the TextBlock inside the UserControl):
<local:BaseFilterUserControl FilterList="{Binding Versions}"
FilterElementName="Release"
SelectedNames="{Binding SelectedReleases}"/>
The ListView is properly populated with items, so the FilterList DependencyProperty is working. But the nested controls are only working when I hard code the bindings:
<TextBlock Text="{Binding Name}" />
For this to work you would need to bind the Path-property of your TextBlocks Text-Binding to the FilterElementName property of your UserControl. Unfortunately the Path property of the Binding class is not a DependencyProperty and therefore not bindable.
One way to to achieve your goal would be to use the DisplayMemberPath property of the ListView, which is bindable:
<ListView x:Name="FilterListView"
Width="150"
Height="300"
ItemsSource="{Binding ElementName=Self, Path=FilterList}"
DisplayMemberPath="{Binding ElementName=self, Path=FilterElementName}"/>
If this approach does not work because you need to specify a more complex ItemTemplate, another way would be create a property of type DataTemplate in your UserControl, use that as ItemTemplate in the ListView and specify it from outside like so:
<local:BaseFilterUserControl FilterList="{Binding Versions}"
SelectedNames="{Binding SelectedReleases}">
<local:BaseFilterUserControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Release}" />
</DataTemplate>
</local:BaseFilterUserControl.ItemTemplate>
</local:BaseFilterUserControl>
I have a custom control where I have modified a ListView. I have a DataTemplate which shows each item as an icon of width 128 and a label beneath it.
<DataTemplate x:Key="AeroIconTemplate">
<Grid VerticalAlignment="Top" Margin="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Image Grid.Row="0" Source="{Binding Image}" Width="128"
MaxHeight="128" Margin="0"/>
<TextBlock Grid.Row="1" Text="{Binding Title}" Foreground="Black"
TextWrapping="WrapWithOverflow" Margin="0"
TextTrimming="CharacterEllipsis" Width="128" MaxHeight="60" />
</Grid>
</DataTemplate>
Now I have added a property to the ListView itself called IconSize. This takes an integer between 16 and 256.
I want to bind the Width, MaxHeight of the Image and the Width of the TextBlock to this property. So whenever the IconSize property is changed the template is adjusted in size. As you can see I am currently binding some stuff to the data object (the image source and the label text), but in this case I want to bind to the ListView control.
How do I do this?
Thanks!
You can use the RelativeSource for that:
... Width="{Binding IconSize,RelativeSource={RelativeSource AncestorType=ListView}}" ...
Be sure to define the correct type, since the WPF ListView does not have the property IconSize. You may need to define your class.
I have a WPF listbox with custom items. Each item is a user control consisting of a grid with two textboxes. I want that the right one takes all the space to fill the ListBoxItem. But all I get working is that the item itself takes the whole space but the textbox takes the size of its content.
So this is the listbox:
<ListBox x:Name="leftListBox" Grid.Column="0" Margin="10"
HorizontalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<local:CustomLine />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
And the user control:
<UserControl x:Class="SharpComparer.CustomLine"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="30">
<UserControl.Resources>
<Style TargetType="{x:Type TextBox}">
<Setter Property="VerticalAlignment" Value="Center" />
</Style>
</UserControl.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="40" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBox x:Name="NumberColumn" x:FieldModifier="public"
Text="{Binding LineNumber}"
Grid.Column="0" HorizontalAlignment="Right" />
<TextBox x:Name="TextColumn" x:FieldModifier="public"
Text="{Binding Text}"
Grid.Column="1" HorizontalAlignment="Left" />
</Grid>
</UserControl>
What I have already tried after some research at some MSDN posts and around here on Stack Overflow: Setting the HorizontalContentAlignment to Stretch for Listbox.ItemContainerStyle. I used some borders to find the piece which makes problems. The ListBoxItems seem to take the whole width, the usercontrol and its grid, too. The textbox does not take all the space although I thought that Width="*" inside the grid's ColumnDefinition would do that.
Another idea was to bind the textbox width to its parent size, but then it also takes the space of the left textbox (which makes sense, because it gets the whole width) and subtracting this width doesn't seem to work.
What am I doing wrong?
You have to change your UserControl code from this:
<TextBox x:Name="TextColumn" x:FieldModifier="public"
Text="{Binding Text}"
Grid.Column="1" HorizontalAlignment="Left" />
to this:
<TextBox x:Name="TextColumn" x:FieldModifier="public"
Text="{Binding Text}"
Grid.Column="1" HorizontalAlignment="Stretch" />
I want to bind the Height of the ListBox to the Height of the StackPanel so the ListBox stretches itself Vertically so the green area is not visible anymore.
When there is no item in the listbox its hidden.
When there is item > 1 the ListBox must be stretching itself to the add/del buttons so the add/del buttons are always at the bottom of the stackpanel(dont want to use dockpanel for that)
How can I do that? I get no binding erros?
<StackPanel x:Name="stack" Background="Green" DataContext="{Binding DocumentViewModelList/}" Orientation="Vertical" >
<ListBox SelectionMode="Single" VirtualizingStackPanel.IsVirtualizing="False"
SelectedItem="{Binding SelectedDocumentViewModel,Mode=TwoWay}"
Height="{Binding ElementName=stack,Path=Height}"
Width="Auto"
Focusable="True"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Auto"
Grid.Row="1"
Name="documentListBox"
BorderThickness="1"
ItemsSource="{Binding DocumentList}"
Visibility="{Binding ElementName=documentListBox,Path=HasItems, Converter={StaticResource boolToVisibilityConverter}}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Id}" />
<TextBlock Text="{Binding Path=Name}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<!--<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}" />
</Style>
</ListBox.ItemContainerStyle>-->
</ListBox>
</StackPanel>
Simply use a Grid instead of a StackPanel:
<Grid x:Name="grid"
Background="Green"
DataContext="{Binding DocumentViewModelList}">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ListBox Grid.Row="0"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch" ..... />
<UniformGrid Grid.Row="1"
Rows="1"
HorizontalAlignment="Center"
VerticalAlignment="Bottom">
<Button Content="Delete" />
<Button Content="Add" />
<Button Content="Open" />
</UniformGrid>
</Grid>
The ListBox simply takes up the entire space of the first row, while the UniformGrid takes up the bottom row with only the space it needs (and makes the buttons all the same size as a bonus).
No need for hard-coded width/height values (or any bindings for height/width), and no value converters needed.
To implement the selective height (if has items x else y) use a value converter... also, I think height will be NaN so try ActualHeight (Bad practice but might work)... use a tool like snoop to see the values!
Is their a specific reason you are using a stackpanel? I grid will work better (StackPanel only give the min space needed where a grid can give as much space as needed)?
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ListBox Grid.Row="1" />
<StackPanel Orientation="Horizontal" Grid.Row="1">
<!-- Buttons -->
</StackPanel>
</Grid>
I've managed to get as far as redirecting content to my stackpanel as shown:
<UserControl
x:Name="taskItem">
<UserControl.ContentTemplate>
<DataTemplate>
<StackPanel>
<Label x:Name="labelHeader" Content="{Binding ElementName=taskItem,Path=Header}" FontFamily="Tahoma" FontSize="16" FontWeight="Bold" />
<Border BorderThickness="0,1,0,0" BorderBrush="#999999" Margin="5,0,5,0">
<StackPanel Margin="10,5,0,0">
<ContentPresenter Content="{TemplateBinding Content}" />
</StackPanel>
</Border>
</StackPanel>
</DataTemplate>
</UserControl.ContentTemplate>
I'm trying to create a control that has a header, a line under it, and then N number of child contents. However, in it's current implementation it won't allow more than one.
What am I doing wrong here?
A user control by definition has one child since it inherits from ContentControl. Make the user control have all the headers and then make ItemsControl the content of the UserControl. Apply your DataTemplate to the ItemTemplate property of the ItemsControl.
<UserControl x:Class="WindowsApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid Name="MainHeadersGrid" Grid.Row="0">
<TextBlock Text="Put your headers here" />
</Grid>
<ItemsControl Name="childItemsWillGoInHere" ItemsSource="{Binding}" Grid.Row="1">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding PropertyOfItem}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</UserControl>
Now, assign the UserControl's template's DataContext to a collection of the objects you want to display.