I want to make it so that my TabControl is vertically scrollable, but I can't seem to do it. The following sample acts as though there was no scrollviewer at all. I even tried putting the TabControl inside the scrollviewer, or putting it all in a grid and constraining the height of the grid, but nothing works.
<DataTemplate x:Key="tabControlTemplate">
<TabControl ItemsSource="{Binding guiItems}" DisplayMemberPath="Title" Height="Auto" Template="{StaticResource mainTabControlTemplateEx}">
<TabControl.ContentTemplate>
<DataTemplate>
<ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Auto" CanContentScroll="True">
<StackPanel Margin="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<ItemsControl ItemsSource="{Binding guiItems }" ItemTemplateSelector="{DynamicResource templateSelector}"/>
</StackPanel>
</ScrollViewer>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
</DataTemplate>
The actual problem is not clear from the question.
You are not getting to see scrollviewer and the content inside is clipped? PLease confirm if that is the case.
If the problem is you are getting to see entire content taking up all the available space, and you would like to control that using scroll viewer, then you would need to set 'MaxHeight' property on Scroll Viewer. This would limit the height of your DataTemplate and would make verticall scroll bar visible if the inner content goes beyond the MaxHeight.
Hope that helps.
I have an ItemsControl in my user control with a scroll viewer around it for when it gets too big (Too big being content is larger than the viewable area of the UserControl). The problem is that the grid that it is all in just keeps expanding so that the scroll viewer never kicks in (unless I specify an exact height for the grid). See code below and thanks in advance.
<UserControl x:Class="BusinessObjectCreationWizard.View.TableSelectionPageView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<GroupBox FontWeight="Bold" Height="300px"
Header="Tables"
Padding="2">
<ScrollViewer>
<ItemsControl FontWeight="Normal"
ItemsSource="{Binding Path=AvailableTables}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding Path=DisplayName}"
IsChecked="{Binding Path=IsSelected}"
Margin="2,3.5" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</GroupBox>
</UserControl>
This user control is loaded here
<Border Background="White" Grid.Column="1" Grid.Row="0">
<HeaderedContentControl Content="{Binding Path=CurrentPage}"
Header="{Binding Path=CurrentPage.DisplayName}" />
</Border>
I would like to not specify the height.
If you remove the Height from your GroupBox (which, as far as I understand, is what you want to do), then it will fill its container, unless there's a panel upstream that imposes its own sizing rules.
I used this simplified version of your XAML. I removed the template and the binding, and hard-coded some items, to make this stand alone; those changes won't affect the way layout is done.
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<GroupBox FontWeight="Bold" Header="Tables" Padding="2">
<ScrollViewer>
<ItemsControl FontWeight="Normal">
<TextBlock>Foo</TextBlock>
<TextBlock>Bar</TextBlock>
<TextBlock>Baz</TextBlock>
</ItemsControl>
</ScrollViewer>
</GroupBox>
</Window>
Run it, and you'll see that the content does indeed size to fit the window, and the scrollbar only enables when the window gets too small to see all three items. I believe this is what you want.
So the problem is most likely one of the parent panels, one you're not showing in your sample XAML. The problem you describe could occur if your GroupBox appears inside a StackPanel:
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<StackPanel>
<GroupBox FontWeight="Bold" Header="Tables" Padding="2">
<ScrollViewer>
<ItemsControl FontWeight="Normal">
<TextBlock>Foo</TextBlock>
<TextBlock>Bar</TextBlock>
<TextBlock>Baz</TextBlock>
</ItemsControl>
</ScrollViewer>
</GroupBox>
</StackPanel>
</Window>
Now the GroupBox appears at the top of the Window, sized to exactly fit its contents. If you shrink the Window enough, the GroupBox will be cut off -- because it's sized to fit its content, not its container. This sounds like the problem you're describing.
The reason is that StackPanel asks its children what their ideal height is (based on their content), and uses that height. Without StackPanel (or something similar), the default is to respect the control's VerticalAlignment, and if that's set to the default value of Stretch, then the control is stretched to fill its parent. This means it won't be taller than its parent, which sounds like what you want.
Solution: remove the StackPanel (or whatever else is causing you problems) and use something else. Depending on what you're trying to accomplish, you might have better luck with a DockPanel or a Grid. Hard to tell without knowing more about your layout.
Edit: Okay, it looks like the problem is indeed the HeaderedContentControl parent -- but not directly. HeaderedContentControl isn't a panel, so it doesn't do any layout of its own (and its descendant, GroupBox, doesn't have this same problem). The problem is its default template -- which includes a StackPanel. The good news is, you're free to use a different template, let's say one with a DockPanel instead:
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<HeaderedContentControl>
<HeaderedContentControl.Style>
<Style TargetType="{x:Type HeaderedContentControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type HeaderedContentControl}">
<DockPanel>
<ContentPresenter ContentSource="Header" DockPanel.Dock="Top"/>
<ContentPresenter/>
</DockPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</HeaderedContentControl.Style>
<GroupBox FontWeight="Bold" Header="Tables" Padding="2">
<ScrollViewer>
<ItemsControl FontWeight="Normal">
<TextBlock>Foo</TextBlock>
<TextBlock>Bar</TextBlock>
<TextBlock>Baz</TextBlock>
</ItemsControl>
</ScrollViewer>
</GroupBox>
</HeaderedContentControl>
</Window>
If you leave off the <HeaderedContentControl.Style> part, this reproduces your problem; but with the style in place, it allows the GroupBox to fill its container, so the ScrollViewer will get a scrollbar when you want it to.
If the previous answer doesn't fix the problem, you could also try binding the Width, Height of your grid to the ActualWidth, ActualHeight of your parent UserControl. Something like:
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="WpfApplication.UserControl1"
x:Name="UserControl">
<Grid Height="{Binding ElementName=UserControl, Path=ActualHeight}"
Width="{Binding ElementName=UserControl, Path=ActualWidth}" />
In this case you aren't setting an explicit width and height but you are limiting the Grids width/height to the constraints of the UserControl it sits in.
I had the same issue, after reading this response I replaced all StackPanels with Grids in UserControl. It resolved the Scrollbar issue.
Try removing the grid entirely and setting the HorizontalAlignment and VerticalAlignment directly on the GroupBox. If a layoutpanel has only one child, it's often redundant... this migth be true in your case.
If that doesn't work... what's the parent of your grid control?
Why not just use a listbox instead of an itemscontrol, that has a built in scrollviewer.
They are different. If you do not want to have the items selectable, then don't use a ListBox. It is going to be heavier, and will also have the deselect a selection everytime the user clicks on an entry. Just put the ItemsControl in a ScrollViewer
I had the same problema with ListBox, it wasn't expanding and the scroll viewer didn't appear. I solved it as follows:
<UserControl x:Class="TesteView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid MaxHeight="710">
....
....
<StackPanel>
<ListBox MaxHeight="515"
ScrollViewer.HorizontalScrollBarVisibility="Hidden"
ScrollViewer.VerticalScrollBarVisibility="Auto"
ItemsSource="{Binding Path=Teste,Mode=TwoWay}">
....
....
</ListBox>
</StackPanel>
</Grid>
</UserControl>
I'm trying to create a scrolling list of fairly large textblocks. I want there to be a vertical scrollbar to show them all, and if they overflow a certain size I want them to display an ellipsis. I actually have all this working pretty good.
I have the following Silverlight XAML:
<Grid x:Name="LayoutRoot" MaxWidth="500" MinWidth="100"
MaxHeight="500" MinHeight="100">
<Grid.DataContext>
<app:MainPageViewModel/>
</Grid.DataContext>
<ScrollViewer>
<ItemsControl ItemsSource="{Binding TextItems}" Margin="0,20,0,20">
<ItemsControl.ItemTemplate><DataTemplate>
<Border MaxHeight="175" Margin="0,0,0,18" CornerRadius="5">
<TextBlock Margin="2" TextTrimming="WordEllipsis"
TextWrapping="Wrap" Text="{Binding}"/>
</Border>
</DataTemplate></ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</Grid>
My problem is that this layout does not use UI virtualization, such as with a VirtualizingStackPanel. So it is pretty slow. What is the best way to get UI virtualization into this layout? I've tried about a half dozen different ways and nothing has worked out all that well.
I managed to get this working in a ListBox because it seems to support virtualization out of the box. However, I'd prefer to use ItemsControl as I don't want these things to be selectable, and I don't want the styling that comes along with a ListBox.
This in Silverlight 4.
There are a few things you need to do to make this work.
Set the ItemsPanelTemplate for
your ItemsControl to a
VirtualizingStackPanel.
Incorporate the ScrollViewer inside
a ControlTemplate for your
ItemsControl instead of just
wrapping it around the outside.
Make sure the ItemsControl has a fixed height so the layout system can work out how many items it needs to fill the viewport. (It looks like you are already doing this by putting the ItemsControl in a Grid - that will allow the layout system to determine the alloted height for the control)
Here's the simplest example I could come up with of this working:
<ItemsControl ItemsSource="{Binding TextItems}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.Template>
<ControlTemplate TargetType="ItemsControl">
<Border>
<ScrollViewer>
<ItemsPresenter/>
</ScrollViewer>
</Border>
</ControlTemplate>
</ItemsControl.Template>
</ItemsControl>
Most of the time the ListBox appears like this:
But every once in a while it looks like this:
Any idea of what is going wrong?
--Edit--
I removed the control templates from the question, because when I removed them from my program the problem still existed. Is this a WPF bug?
Have you tried setting SnapsToDevicePixels="True" on the ListBox Item border? Since the thickness is 1 "Device independent unit" I am thinking that the border is falling on a pixel boundry.
I had almost the exact same problem, see my question, and I never found a real answer. What I do nowadays is strip the scrollviewer from the listbox template and embed the entire listbox itself in a new scrollviewer. Doesn't work for all occasions, but it's a neat trick nonetheless.
The xaml looks like this:
<ScrollViewer>
<ListBox>
<!--strip default presenter-->
<ItemsControl.Template>
<ControlTemplate>
<ItemsPresenter />
</ControlTemplate>
</ItemsControl.Template>
<ListBox.ItemTemplate>
<DataTemplate>
<!--data template goes here-->
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</ScrollViewer>
I'm not a huge xaml wizard so if anybody could transfrom this into a reusable piece of code, by all means do so.
I've spent a few minutes searching on Google and have not found anything related to this issue I'm having:
Today I upgraded to the Silverlight 3 SDK and converted a project that I'm working on. I then noticed a bug in my program with a Listbox that has a Checkbox as its DataTemplate.
When one or more items is checked, and I scroll up and down, it seems that a few of the Checkboxes at the extremes get checked off and on randomly. This does not trigger the Checked/Unchecked event, however.
Has anyone seen this behavior? I'm not doing anything out of the ordinary, simply scrolling up and down once at least one checkbox has been checked, and a couple of others that I have not touched seem to get checked on and off repeatedly. This was definitely not happening with the Silverlight 2 SDK.
Here's the XAML definition for my Listbox:
<ListBox x:Name="cBoxSalesmen" Width="135" Height="200"
HorizontalAlignment="Left" VerticalAlignment="Top">
<ListBox.Template>
<ControlTemplate>
<Border Style="{StaticResource BorderStyleThin}">
<StackPanel Orientation="Vertical">
<TextBlock Text="Salesmen" />
<ScrollViewer Height="176" VerticalScrollBarVisibility="Visible" >
<ItemsPresenter />
</ScrollViewer>
</StackPanel>
</Border>
</ControlTemplate>
</ListBox.Template>
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Margin="0" Content="{Binding}" FontSize="10" HorizontalAlignment="Left"
Checked="SalesmenCheckbox_Checked" Unchecked="SalesmenCheckbox_Unchecked"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
The default ItemsPanel of the ListBox is the VirtualizingStackPanel. You can change it to use the StackPanel, this way you problem is solved.
Use this code:
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel />
</ItemsPanelTemplate>
<ListBox.ItemsPanel>
I suspect your problem is a result of ListBox (in SL3) now using an ItemCollectionGenerator. The concept behind this is that not all the objects found in the source data collection need to have had their corresponding instance of the DataTemplate created and added to the Visual Tree. As you scroll toward the bottom items that may soon be needed are created. Additionally items that have already be created but are now scrolled quite same way out of view can be removed. If the user scrolls up they are re-created.
If this is the case then the IsChecked state of any checkbox in this list will be lost at some point for large lists. To solve this you would need include a property in the data type to which you can bind IsChecked. Hence as ListBox re-creates items it correctly assigns the IsChecked value.