Hey I want a WPF listbox to change the width depending on the length of the content.
So there is no scrollbar.
Would be awesome if the size of the Grid and MainWindow would change also.
Is there a way to the size of a string. not the normal length? idk
Or can you detect if the scrollbar is visible or not?
It's trivial to achieve if the listbox is the only thing in your window:
Height="300"
Title="MainWindow"
SizeToContent="Width"
>
<Grid>
<ListBox>
<ListBoxItem>ListBox Item #1</ListBoxItem>
<ListBoxItem>ListBox Item That is wider</ListBoxItem>
<ListBoxItem>ListBox Item #3</ListBoxItem>
</ListBox>
</Grid>
</Window>
Do not set width on the window.
Set SizeToContent="Width" on the window.
It will then size to the longest string in your listbox.
If you have a more complicated layout, it's a little more complicated.
Say your window ( or perhaps the container the listbox is in ) was a fixed or minimum width.
You can set horizontal alignment and content alignment on the listbox.
Here, I've made the grid pink so you can see the listbox extent
Height="300"
Title="MainWindow"
SizeToContent="Width"
>
<Grid Background="Pink"
MinWidth="600">
<ListBox Width="Auto"
HorizontalAlignment="Left"
HorizontalContentAlignment="Left"
>
<ListBoxItem>ListBox Item #1</ListBoxItem>
<ListBoxItem>ListBox Item That is wider</ListBoxItem>
<ListBoxItem>ListBox Item #3</ListBoxItem>
</ListBox>
</Grid>
Related
I have a StackPanel spanning the entire screen vertically in a grid, and the panel's VerticalAlignment option set to Bottom. When I add items to the panel in code, their positions start at the bottom, and move up when I add more. This is desired. However, what is not desired is that after the screen is filled vertically with items, adding more pushes them off the top of the screen. My desire is to have additional items fall off the bottom; I don't care if they are not visible; I just don't want the topmost items to disappear.
Any tricks you might know of to help me through this? Thank you in advance.
My desire is to have additional items fall off the bottom
You need to wrap the StackPanel in another container that allows the StackPanel itself to grow as much as it wants, in a way that makes the StackPanel appear to expand from the bottom, but in reality expand from the top so that when it exceeds available space, the excess is removed from the bottom instead of the top.
The Grid control will do exactly that. For example:
<Window x:Class="TestSO67169225StackPanelFromBottom.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<Style TargetType="TextBlock">
<Setter Property="FontSize" Value="36"/>
</Style>
</Window.Resources>
<Grid VerticalAlignment="Bottom">
<StackPanel>
<TextBlock Text="StackPanel Item 1"/>
<TextBlock Text="StackPanel Item 2"/>
<TextBlock Text="StackPanel Item 3"/>
<TextBlock Text="StackPanel Item 4"/>
<TextBlock Text="StackPanel Item 5"/>
<TextBlock Text="StackPanel Item 6"/>
</StackPanel>
</Grid>
</Window>
Looks like this:
But when you add more items, looks like this:
I tried the suggestion here regarding Stretching, but it didn't work for me.
I have a TabItem that hosts a UserControl that is essentially just a ListBox with an ItemsPanel. The ItemsPanel forces the ListBox to display its contents horizontally. The contents of the ListBox are databound to an ObservableCollection<StackPanelContents>, which is another UserControl. StackPanelContents itself basically just contains a List of objects with some visual representation (they contain a UIElement for visualization).
In general the code works properly in that it renders all of the data that I have contained in the ObservableCollection, but the problem is that the items don't resize as the window is enlarged or shrunk.
Here's an overview of what the class hierarchy looks like:
And here are the results:
The XAML for the main window just has the TabControl and TabItem:
<Window x:Class="ResizeStackPanelInListBox.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<TabControl>
<TabItem Header="Test" x:Name="MyTabItem">
<!-- contents are set in code behind -->
</TabItem>
</TabControl>
</Window>
The ListBoxContainer XAML that displays the StackPanelContents looks like this:
<UserControl x:Class="ResizeStackPanelInListBox.ListBoxContainer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="Auto" Width="Auto">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<TextBlock>ListBox with StackPanels as its ListBoxItems:</TextBlock>
<ListBox Grid.Row="1" ItemsSource="{Binding StackPanels}" HorizontalContentAlignment="Stretch">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Width="Auto" Height="Auto" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</Grid>
</UserControl>
And the StackPanelContents UserControl looks like this:
<UserControl x:Class="ResizeStackPanelInListBox.StackPanelContents"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="Auto" Width="Auto">
<StackPanel>
<TextBlock Text="StackPanel"></TextBlock>
<StackPanel x:Name="MyStackPanel">
</StackPanel>
</StackPanel>
</UserControl>
Can anyone explain why this isn't resizing automatically, and how I can go about resolving this? Am I going to have to write my own custom panel to deal with this, and use MeasureOverride and Arrange?
The problem is that you're using StackPanels to arrange items in both directions so you're losing any sort of stretching. StackPanel allows its children to stretch only in the direction opposite the Orientation. The other direction will only be given as much space as it needs in order to allow the rest of the items as much space as possible. So for a default Vertical StackPanel anything you put inside will stretch horizontally but squeeze toward the top vertically. Since you have Vertical StackPanels inside a Horizontal StackPanel you're items are getting squeezed both ways.
There are a few options depending on what you want your items to do. Changing to a DockPanel will allow the last item to stretch and fill the space (the vertical one would need to set DockPanel.Dock=Top in the ItemContainerStyle). A Grid with * sized Rows and Columns works well for normal layouts but not in the case of ItemsControls since the Row and Column need to be set for each item (it can be done using ItemsControl.AlternationIndex but it's a pain and fragile). Using a 1 row/column UniformGrid (as in the answer you referenced) will evenly divide the available space and doesn't require any additional settings on the items.
If you need some more complex layout strategy with different items getting different amounts of space or stretching behavior you'll need a custom Panel.
try set in window
SizeToContent="WidthAndHeight"
I am using a ListBox with a DataTemplate to create the below map legend. I would like to get the ListBox to have a transparent background (where it is now white) and the ListItems to retain their existing white background. The two legends would then appear to float with a transparent gap between.
I have tried setting the ListBox background with a SolidBrush set to 0 opacity but that doesn't seem to work. I understand that items in the tree cannot have transparency that is less than items above in the tree. Is that my issue and how do I resolve?
Thanks
alt text http://www.freeimagehosting.net/uploads/659cd194e7.png
You can set the Background to {x:Null}.
Did you try setting the background color of the ListBox to "Transparent" (literally)?
Here is some code that worked for me:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" Background="Blue">
<Grid>
<ListBox x:Name="ListBox1" Margin="12,25,114,97" Background="#00E51A1A">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="4" Height="20" Width="100" Background="Yellow" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Window>
I have a textbox and datagrid inside of a dockpanel that is in a WPF groupbox.
<GroupBox Margin="8,142.04,1.783,230.4" Height="Auto" Header="Desired Meeting Outcomes (decisions or actions)?" MaxWidth="635" MinWidth="550" FontWeight="Bold" FontSize="13.333" BorderBrush="#FFD5DFE5" MinHeight="106" VerticalContentAlignment="Stretch">
<DockPanel Margin="0">
<local:TextboxControl Margin="0" d:LayoutOverrides="Height, HorizontalMargin" Width="538.217" VerticalAlignment="Top" HorizontalAlignment="Left" DockPanel.Dock="Top"/>
<local: Height="Auto" HorizontalAlignment="Left" MinHeight="25" MinWidth="538" DockPanel.Dock="Top"/>
</DockPanel>
</GroupBox>
I am adding rows in the datagrid dynmaically from the textbox causing the datagrid to grow. However, my groupbox's height is not growing dynamically even though its height is set to Auto. How can I get my groupbox to grow and shrink based upon the size of the contents that it holds?
You have margins set on all 4 sides with a VerticalAlignment of Stretch. In a Grid this will basically give you a GroupBox that sizes with its parent but not its content. Remove the margin from the right and bottom and change the VerticalAlignment to Top.
The margins are the order of L, T, R, B. So zero out the last two. Height=Auto and VerticalContentAlignment=Stretch are the defaults so you can get rid of those too. Try to keep the XAML as clean as possible.
It's clear from the markup that you're using Blend or Visual Studio's designer. I would suggest using the designer for "preview" mode rather than editing. Although it's gotten much better I find the layout behavior of the designer in both products to be very frustrating. Getting familiar with creating XAML by hand pays dividends in the long run.
EXAMPLE
As per the comments, I'm adding an example of how you would have a DataGrid that causes its parent elements to automatically grow based on height. Notice that only the Window itself has a fixed size. For a Window, if you wanted to make it grow based on height you could set SizeToContent=Height. Notice how you only need to set VerticalAlignment=Top on the outermost element.
MainWindow.xaml
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="640" Height="480">
<Grid x:Name="LayoutRoot" Background="Green" VerticalAlignment="Top">
<Border Margin="5" BorderBrush="Yellow" BorderThickness="4">
<GroupBox Header="Data Grid" Background="Orange">
<DataGrid x:Name="dg" AutoGenerateColumns="True" />
</GroupBox>
</Border>
</Grid>
</Window>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow( )
{
InitializeComponent( );
var items = new ObservableCollection<DateTime>( );
dg.ItemsSource = items;
var timer = new DispatcherTimer( );
timer.Interval = TimeSpan.FromSeconds( 2 );
timer.Tick += ( s, e ) => items.Add( DateTime.Now );
timer.Start( );
}
}
What is the container of the GroupBox ? It could prevent it from growing.
For example, if the container is the Windows, does it have SizeToContent="Height" ?
I have a list box which is of a certain fixed width. The number of items in the listbox varies. Is there a way to center the contents of the list box? The "Content Presenter" of the ListBoxItem ,centers each item inside its Template instead of centering it with respect to the entire listbox width.
Sorry about not replying earlier. The issue was with the width of the ItemsPanelTemplate which I was using in my Listbox. Earlier Width was set to 925. Changing this Width to MaxWidth worked. The code:
<ItemsPanelTemplate x:Key="ItemsPanelKey">
<Contact:AnimatedWrapPanel HorizontalAlignment="Center" MaxWidth="925">
<Contact:AnimatedWrapPanel.Interpolation>
<interpolate:BackInterpolation Amplitude=".5" Suppression=".2" EdgeBehavior="5"/>
</Contact:AnimatedWrapPanel.Interpolation>
</Contact:AnimatedWrapPanel>
</ItemsPanelTemplate>
Not sure, but sounds like what you want is a custom item template that centers each item. If I'm right, the only tricky thing is that the template has to be the same fixed width as the listbox. So if your listbox contains some object Foo and Foo.Text is a simple text property to be displayed, you could do it like so in Xaml:
<ListBox x:Name="TheListBox" Width="300">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Width="300">
<TextBlock Text="{Binding Text}" HorizontalAlignment="Center" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
and the code behind contains something like:
List<Foo> ListOfFoo = new List<Foo>();
ListOfFoo.Add(new Foo(){Text="Something"});
ListOfFoo.Add(new Foo(){Text="Something Else"});
ListOfFoo.Add(new Foo(){Text="Something Completely Different"});
TheListBox.ItemsSource = ListOfFoo;
If it's more complex or you can't make it work, post some code and we'll go from there.