I have a listbox in which I use a ListBox.ItemsPanel - WrapPanel.
<ListBox ItemsSource="{Binding Path=Applets}" Margin="10,92,10,10" ScrollViewer.HorizontalScrollBarVisibility="Disabled" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Vertical" IsItemsHost="True">
</WrapPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>...
I am trying to have the wrappanel have a behavior such that the items fill in to the right as the width is made wider and wrap as needed when the window is made narrower. I have played with it but the correct combination eludes me. Does anyone have a suggestion?
My next goal would be able to reorder/ sort the items and have the render update.
TIA
I am trying to have the wrappanel have a behavior such that the items fill in to the right as the width is made wider and wrap as needed when the window is made narrower. I have played with it but the correct combination eludes me. Does anyone have a suggestion?
The code you have is almost correct, just change the Orientation to Horizontal and it should work as you describe
My next goal would be able to reorder/ sort the items and have the render update.
You don't have to do anything special for that, it's the normal behavior of a ListBox. Just change the sort order (using ICollectionView.SortDescriptions), and the UI will reflect the changes
<ListBox Grid.Row="1" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBoxItem Name="lbiTmp3_1"><CheckBox>
<TextBlock TextWrapping="Wrap">
lkjfd gmlkdsfmlk gmdsgf kds lkjglfdjmlkg jfdsg dsgf lkhfdgs lkjds fg
</TextBlock></CheckBox>
</ListBoxItem>
<ListBoxItem Name="lbiTmp3_2">C0ucou</ListBoxItem>
<ListBoxItem Name="lbiTmp3_3">C0ucou</ListBoxItem>
</ListBox>
Related
I want to show a list of thumbnails, and allow the user to choose one. A ListBox seemed an obvious choice, setting the template to include the thumbnail and description.
The following code does this correctly...
<ListBox Margin="5"
Name="BackgroundsLb">
<ListBox.ItemTemplate>
<DataTemplate>
<Border Margin="5"
BorderBrush="Black"
BorderThickness="1">
<StackPanel Margin="5">
<Image Source="{Binding Path=Data, Converter={StaticResource BytesToImageVC}}"
Width="150"
HorizontalAlignment="Center" />
<TextBlock Text="{Binding Path=Description}"
HorizontalAlignment="Center" />
</StackPanel>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
However, this displays the thumbnails vertically, one per row, as is normal for a ListBox. Given that the thumbnails are only 150 pixels wide, I would like to show them in something more like a grid, but (ideally) in a way so that the number of columns adapts to the size of the window.
I tried replacing the ListBox with an ItemsControl, adding in the following...
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Vertical" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
...and it displayed exactly how I wanted it, but the ItemsControl does not allow selection, so is no use for my purpose.
Is there a way to achieve a flexible, selectable display that fills the horizontal space, and breaks onto a new row according to the size of the window?
Thanks
You can use an ItemsPanelTemplate in a ListBox just the same as you are using one in the ItemsControl. The difference I think you're seeing is that ListBox uses scroll bars by default rather than wrapping the content. Basically the content is allowed to grow forever, so you never get the wrap. Instead you get a scrollbar. The good news is you can disable this behavior. The following should give you a horizontal wrap, where new rows are created as needed.
<ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
I've spend couple of hours trying to reverse the order of listbox (bottom to top) as described on the picture:
That means that newly added items should be inserted at the top of the listbox. I do not understand that something so trivial can be so difficult to implement in wpf...
I do not want to use transient effects on panel and items itself because it causes strange behavior on scrollviewer. I can not use some sort definitions on ICollectionView because I want to use a data virtualization which provides ordered data and I have to add them as is.
This is my Listbox (ListView) definition:
<ListView ItemsSource="{Binding Collection}"
VirtualizingPanel.VirtualizationMode="Recycling"
VirtualizingPanel.ScrollUnit="Pixel"
ScrollViewer.IsDeferredScrollingEnabled="True"
IsSynchronizedWithCurrentItem="True"> <!--To manage scrolling from view model using ICollectionView.ScrollTo()-->
<ListView.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"/>
</DataTemplate>
</ListView.ItemTemplate>
<!--To auto scroll to bottom (via calling ICollectionView.ScrollToBottom()-->
<i:Interaction.Behaviors>
<Behaviors:ScrollIntoCurrentItemBehavior />
</i:Interaction.Behaviors>
<!--To pin listbox panel to bottom-->
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel VerticalAlignment="Bottom"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
Is there any acceptable solution for that? I really appreciate any help! thanks
I am trying to get an alternate row color effect on a Listbox / wrappanel. However since the orientation is Horizontal, The alternate columns are getting the alternate colors. I want the elements to be listed side ways and then wrapped. How can I set the alternate color on rows based on this.
<ListBox ItemsSource="{Binding MySource}" ItemContainerStyle="{StaticResource alternatingListItemStyle}" AlternationCount="2">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" MaxWidth="300"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding MyCaption}"/>
</DataTemplate>
</ListBox.ItemTemplate>
The possible reason for alternating color for columns is the 'MaxWidth'.
As the MaxWidth for WrapPanel is 300, it's possible to hold more than one item.
If you reduce the maxwidth, it may hold a single item.
Hope this helps.
(Can you explain why you are using a wrap panel in ItemsPanelTemplate?
I am not sure how you want the output to look like.)
I want to show multiple columns in the list box. I have referred the following link Using WrapPanel and ScrollViewer to give a multi-column Listbox in WPF.
Problem:
I want to scroll the content using repeat button. How to control the listbox scrollbar using button.
Code:
<ListBox Name="lbTrack" ScrollViewer.VerticalScrollBarVisibility="Disabled" ItemsSource="{Binding}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock FontSize="14" Margin="10" Text="{Binding TrackName}" /> </StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True" Orientation="Vertical"></WrapPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
Yes, that will work fine. Is there a problem you're having with it?
EDIT: In response to the updated question... In order to programmatically scroll the ListBox you can use the UI Automation framework. Below is some Silverlight code that I found that should work for WPF as well.
var automationPeer = FrameworkElementAutomationPeer.FromElement(element) ??
FrameworkElementAutomationPeer.CreatePeerForElement(element);
var scrollProvider = automationPeer.GetPattern(PatternInterface.Scroll) as IScrollProvider;
if (scrollProvider != null) {
scrollProvider.Scroll(horizontalScrollAmount, verticalScrollAmount);
}
It may also be possible to get this to work by pointing the ScrollBar.LineLeftCommand and ScrollBar.LineRightCommand at the ScrollViewer nested in the ListBox's template but I wasn't able to get that working and I don't know if you could do that without code anyway.
I have a ListBox in a grid that gets databound when the page loads... pretty straightforward. The problem I'm having is that, after the box is databound, I can scroll... but not all the way to the bottom of the list. It stops an item or two short and won't let me scroll anymore. Here's the listbox XAML:
<Grid x:Name="ContentGrid" Grid.Row="2">
<ListBox x:Name="lbFeed" ItemsSource="{Binding Items}" SelectionChanged="lbFeed_SelectionChanged" VerticalAlignment="Top" Width="480">
<ListBox.ItemTemplate>
<DataTemplate x:Key="MyDataTemplate">
<StackPanel Orientation="Vertical" Width="430">
<TextBlock Text="Some text" TextAlignment="Center" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
I can post more code, but I'm still getting my feet wet in XAML and I'm not sure what might be causing this. If you need more context, let me know and I'll add it here.
This is a known issue at this stage of ctp release if you happen to have rows that are not fixed height. If this is the case you will likely notice your scrolling is a bit jittery too. Fix the height of your content for now if this is the case for your app and all is resolved.