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.
Related
Can't find a solution to a pretty simple UI problem:
I have a model with a Images property. The Images property holds a collection of items Image.
As for now on - I have a ListBox and binding a ListBoxItem data template to Images.Image and all good. But I have each item on a new line. Not good.
What I am willing to achieve is, lets describe as, a Listbox with Horizontal items orientation and limit of items in a row. Just like Large icons view style in Windows Explorer.
Have somebody previously implemented such a solution? Any advice will be highly appreciated.
Thank you in advance.
Use a WrapPanel (or some other appropriate Panel) as the ListBox's ItemsPanel, and disable horizontal scrolling:
<ListBox ItemsSource="{Binding Images}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Image Source="{Binding}" Width="100" Margin="5"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
You can set the ListBox's ItemPanelTemplate to WrapPanel, like this.
I am not sure why it is always like that - but as soon as I asked, I have found an alternative solution with usage of ListView:
<ListView ItemsSource="{Binding Images}">
<ListView.ItemTemplate>
<DataTemplate>
<Image Source="{Binding Image}" />
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="2" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
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 have created a listbox with a tiled data template. What I am trying to figure out now is how to properly apply a scale effect to each listbox item when a mouse over or selected event occurs and have it render properly within the wrap panel. I currently have the animations added to the visual states of the ListBoxItemTemplate.
A couple of thoughts:
When the animation is called the tiles within the wrap panel do not reposition to allow for the scaled item to be viewed properly. I would like to have the items within the wrap panel re-position to allow for the item scaled to be visible.
Also I notice that the items when scaled are going beyond the boundary of the wrap panel is there a way to also keep the item when scaled constrained to the viewable area of the wrap panel?
Code used in in search view
<Grid x:Name="LayoutRoot">
<ListBox x:Name="ResultListBox"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Background="{x:Null}"
BorderThickness="0"
HorizontalContentAlignment="Stretch"
ItemContainerStyle="{StaticResource TileListBoxItemStyle}"
ItemsPanel="{StaticResource ResultsItemsControlPanelTemplate}"
ItemsSource="{Binding SearchResults[0].Results}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<formatter:TypeTemplateSelector Content="{Binding}" HorizontalContentAlignment="Stretch" Margin="2.5">
<!-- Person Template -->
<formatter:TypeTemplateSelector.PersonTemplate>
<DataTemplate>
<qr:ucTilePerson />
</DataTemplate>
</formatter:TypeTemplateSelector.PersonTemplate>
<!-- Incident Template -->
<formatter:TypeTemplateSelector.IncidentTemplate>
<DataTemplate>
<qr:ucTileIncident />
</DataTemplate>
</formatter:TypeTemplateSelector.IncidentTemplate>
</formatter:TypeTemplateSelector>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
ResultsItemsControlPanelTemplate is defined in app.xaml as
<ItemsPanelTemplate x:Key="ResultsItemsControlPanelTemplate">
<toolkit:WrapPanel x:Name="wrapTile"/>
</ItemsPanelTemplate>
I would greatly appreciate any suggestions on where to look
Thanks in advance
Image of current result
Render transformers are applied after a layout has occured, its purely graphical task that the Silverlight layout engine knows very little about. What you need is control that when scaled actually increases the size it desires and causes Silverlight to update its layout.
The control you need is the LayoutTransformer control from the Silverlight Toolkit.
Place the content of each of your tiles inside a LayoutTransformer and assign a ScaleTransform to its LayoutTransform property. Now you can get your animations to manipulate the transform and as the tile grows the other tiles will flow.
Working through this I have my user controls stored within within a Listbox datatemplate which is also a userControl referenced within the project. I think I have a partial solution started so now I need to just continue to tweak what is happening. Since I am using a datatemplate I had to set a binding reference on the user control to the Layouttrasnformation
<ListBox x:Name="ResultListBox"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Background="{x:Null}"
BorderThickness="0"
HorizontalContentAlignment="Stretch"
ItemsPanel="{StaticResource ResultsItemsControlPanelTemplate}"
ItemContainerStyle="{StaticResource TileListBoxItemStyle}"
ItemsSource="{Binding SearchResults[0].Results}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<formatter:TypeTemplateSelector Content="{Binding}" HorizontalContentAlignment="Stretch" Margin="2.5">
<!-- Person Template -->
<formatter:TypeTemplateSelector.PersonTemplate>
<DataTemplate >
<layoutToolkit:LayoutTransformer x:Name="PersonTransformer">
<layoutToolkit:LayoutTransformer.LayoutTransform>
<ScaleTransform x:Name="personScale"/>
</layoutToolkit:LayoutTransformer.LayoutTransform>
<qr:ucTilePerson MouseEnter="ucTilePerson_MouseEnter" Tag="{Binding ElementName=PersonTransformer}" />
</layoutToolkit:LayoutTransformer>
</DataTemplate>
</formatter:TypeTemplateSelector.PersonTemplate>
//rest edited for brevity
Then within the code behind of the usercontrol which holds the listbox I used the following:
private void ucTilePerson_MouseEnter(object sender, MouseEventArgs e)
{
var ps = ((UserControl)sender).Tag as LayoutTransformer;
if (ps != null)
{
var transform = ps.LayoutTransform as ScaleTransform;
transform.ScaleX = (transform.ScaleX + 1.2);
transform.ScaleY = (transform.ScaleY + 1.2);
Dispatcher.BeginInvoke(() => { ps.ApplyLayoutTransform(); });
}
I still have to tweak this some as it does not seem to be as fluid as I like ( and I have to also setup mouseLeave events).
Not sure if this is the most appropriate approach and I would appreciate any feedback on alternatives.
Thanks again to Anthony for pointing me in the right direction
<DataTemplate x:Key="dirtSimple">
<TextBlock Margin="10,0,0,0" Text="{Binding Path=CurrentBook.Published, StringFormat=d}"></TextBlock>
</DataTemplate>
<ControlTemplate x:Key="lbWrapPanelTemplate">
<StackPanel Orientation="Horizontal" Margin="2" Background="Aqua">
<ItemsPresenter></ItemsPresenter>
</StackPanel>
</ControlTemplate>
...
<ListBox Template="{StaticResource lbWrapPanelTemplate}" x:Name="bookListBox" Grid.Row="0" ItemsSource="{Binding Path=BookSource}" ItemTemplate="{StaticResource dirtSimple}" >
</ListBox>
The list box is displaying correctly, with a beautiful "Aqua" background, and each item is boringly displayed with just a date. For some reason though the items are not flowing horizontally. I originally tried it with the Silverlight Toolkit's WrapPanel, with the same problem, but I can't even get it to work with a built-in StackPanel, so I suspect I'm missing something.
Are you trying to get selection-based behavior that a ListBox provides? If not, use an ItemsControl (and supply an ItemsPanel as below).
The reason it's not going horizontal is the ItemsPresenter ultimately has its own panel it lays out items in. It's not inserting each item separately into your StackPanel (or WrapPanel), it's putting them in its own panel
What you want to do is specify a value for ItemsPanel like so:
<ListBox ItemTemplate="{StaticResource dirtSimple}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
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.