I'm tyring to build a CheckBoxList to a Silverlight control I'm building and I'm having some trouble getting it right.
What I'm after, is a CheckBoxList that wraps the CheckBoxes vertically within a GridRow of * height. The problem I have is that I want to specify the height of the WrapPanel to be that of the row it is within.
In WPF it looks like the following:
<ScrollViewer BorderThickness="0"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Hidden" >
<ItemsControl Name="ic">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel Orientation="Vertical"
Height="{Binding Path=ActualHeight,
RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType={x:Type ScrollContentPresenter}}}" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding Path=Description}" Margin="0,0,10,2" FontSize="12"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
Silverlight doesn't support RelativeSource in the same way so I'm unable to do it in the same way I did with WPF. I've seen some work arounds for RelativeSource, but they're either massively verbous or I can't seem to get them working.
Surely there's a simple way of setting the height of the WrapPanel in Silverlight?
In case anyone comes across this and doesn't already know, RelativeSource is being added in Silverlight 5
Related
I'm having a UI design issue, this is what I want the contents of my app window to shrink to fit the smallest dimension of the window.
Using the XAML below, when the window is too narrow the contents are shrunk to fit. Perfect. My problem is when the window is too short, the contents fall out the bottom, like this:
<ItemsControl ItemsSource="{Binding GroupStatsDisplayList}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Background="Red" Margin="5" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Viewbox Margin="4" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Width="Auto" Height="Auto" >
<ListBox>
<StackPanel Orientation="Horizontal" Margin="5" Background="Blue">
<Label Content="{Binding GroupID}" FontWeight="Bold"/>
<Label Content="{Binding GroupName}" Width="100" FontWeight="Bold" />
<Label Content="{Binding CallsInQueue}" FontWeight="Bold" />
<Label Content="{Binding TSF}" FontWeight="Bold" />
</StackPanel>
</ListBox>
</Viewbox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
I have read in answers to similar questions that the ItemsControl uses a StackPanel as its default itemspanel and that the StackPanel does behave the way I'm seeing. A grid has been recommended to overcome issues like mine.
So I tried telling my ItemsControl to use a Grid:
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Grid Background="Red" Margin="5" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
Better because the contents do resize when constrained in either direction. Worse because it seems like there is only one ViewBox->ListBox element that gets updated with the last item in my collection (I can see the three items in the collection cycle through the display as the app starts up). I don't see all items in my collection on screen, only the last one.
I also read that a DockPanel could save me...
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<DockPanel Background="Red" Margin="5" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
That's when things got crazy and I decided to write this question. Now all items in my collection are there, but they appear one by one when I expand the window horizontally, each new item appears as the existing ones expand to the vertical extent of the window.
How do I get a layout that looks like the first image but will shrink to fit within the smallest dimension of the window?
Why do you have a ListBox in your DataTemplate, when you have only one hardcoded item the StackPanel? To clarify that: The ItemTemplate defines how you want one item to appear in your items Collection. For Example you could create an ItemTemplate which shows an Album Cover on the left, the Artist Name next to it and on the bottom a Star Rating.
A Grid should not be used as an ItemsPanel, because for that you would need to supply a dynamic Grid/Col Definitions collection.
Using a ViewBox is my best advice. But not in the ItemTemplate, this would only size one children, a viewbox around the whole itemscontrol.
This is the XAML that I used based on the answer from dowhilefor.
<Viewbox Margin="3" >
<ItemsControl ItemsSource="{Binding GroupStatsDisplayList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="1" Background="LightGreen">
<Label Content="{Binding GroupID}" FontWeight="Bold"/>
<Label Content="{Binding GroupName}" Width="100" FontWeight="Bold" />
<Label Content="{Binding CallsInQueue}" FontWeight="Bold" />
<Label Content="{Binding TSF}" FontWeight="Bold" />
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Viewbox>
I haven't done WPF in a while, and probably it's not considered very good practice, but maybe you could just use a scaletransform on your entire gui ?
I always liked playing around with them.
What is the proper way to bind to the Parent of an ItemsControl from within the ItemsControl.ItemTemplate?
Non working attempt:
<ControlTemplate TargetType="{x:Type local:ParentUserControl}">
<ItemsControl ItemsSource="{Binding MyCollectionViewSource.View, RelativeSource={RelativeSource TemplatedParent}}"
IsTabStop="False"
Focusable="False">
<ItemsControl.ItemTemplate>
<DataTemplate>
<local:ChildUserControl BoundProp1="{Binding Prop1}"
BoundObjProp2="{Binding RelativeSource={RelativeSource
Mode=FindAncestor,
AncestorType={x:Type local:ParentUserControl}}}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ControlTemplate>
The binding looks fine to me, but you do not specify a Binding.Path, are you sure that you want to bind directly to the control and not a property?
I had similar requirement and the following worked for me:
<ItemsControl ItemsSource="{Binding Items}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapGrid Orientation="Horizontal" ItemWidth="{Binding ItemWidth}" ItemHeight="{Binding ItemHeight}"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate >
<views:MyUserControl
Width="{Binding DataContext.ItemWidth, ElementName=PageRoot}"
Height="{Binding DataContext.ItemHeight, ElementName=PageRoot}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
P.S. my app is in XAML for WinRT
I have not found a solution to this problem. In the end I had to use work arounds which violated my desired separation of concerns, but functioned as expected. I believe this comes down to an issue in the wpf framework, hopefully 4.5 will fix it.
I have WrapPanel where I want the control inside of it to go horizontally and centered, but when I have a listbox or a ItemsControl those elements just go downwards.
<toolkit:WrapPanel>
<ItemsControl x:Name="AnswerListBox" ItemsSource="{Binding Answers}" ScrollViewer.VerticalScrollBarVisibility="Disabled" >
<ItemsControl.ItemTemplate>
<DataTemplate>
<!-- those don't wrap horizontally and go downwards -->
<local:spriteToggleButton Text="{Binding text}" Selected="{Binding selected}" Sprites="{Binding Path=DataContext.UISprites, ElementName=questionField}" IsChecked="{Binding selected, Mode=TwoWay}" GroupName="{Binding Path=DataContext.QuestionTitle, ElementName=questionField}" ClickMode="Press" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</toolkit:WrapPanel>
I came across some similar issues and found out about ItemsPanel, so I tried that but it wrap but only to Content and didn't display the rest of the control inside of it.
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
I take it that ItemsPanel is telling the ItemsControl which control to wrap it with but then it seems to ignore the rest of my datatemplate.
Joseph,
Slightly shooting in the dark here; but this is how I have used the WrapPanel (not through the ItemControl).
<ListBox>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel Width="700" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
....
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Essentially the Listbox's ItemsPanel tells it to use the WrapPanel and then you could have anything you need in the DataTemplate. Note that the width is important as it tells the WrapPanel where to start wrapping.
Does this help?
Is there a way to populate the Silverlight toolkit's WrapPanel via binding to an ObservableCollection? All the examples I've seen so far, including the toolkit example itself, either populate the WrapPanel programmatically or by explicitly adding each item in XAML.
Thanks for your help!
EDIT: Following Geert van Horrik's advice I tried using an ItemsControl to load the WrapPanel via binding. This is the XAML:
<ScrollViewer VerticalScrollBarVisibility="Auto"
Height="440"
Margin="0,12,0,0">
<ItemsControl ItemsSource="{Binding SelectionContent}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border BorderThickness="1"
CornerRadius="4"
BorderBrush="{Binding BorderBrush}">
<toolkit:GestureService.GestureListener>
<toolkit:GestureListener Tap="OnWrapPanelTapped"
DoubleTap="OnWrapPanelDoubleTapped" />
</toolkit:GestureService.GestureListener>
<Image Source="{Binding ImageSource}"
MaxHeight="48"
MaxWidth="48"
Margin="16" />
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</ScrollViewer>
SelectionContent is an ObservableCollection present in this UserControl's code behind. It consists of SelectionItem object, which implements INotifyPropertyChanged and exposes 2 public properties - ImageSource and BorderBrush.
I'm setting the DataContext for the UserControl in its constructor to SelectionContent. But this isn't working and the WrapPanel does not display anything.
You should use an ItemsControl. Then, you can set the WrapPanel as items panel.
<ItemsControl ItemsSource="{Binding MyItemsSource}">
<ItemsControl.ItemsPanel>
<WrapPanel />
</ItemsControl.ItemsPanel>
</ItemsControl>
I'm trying to get an ItemsPanelTemplate working for a ListBox. The ListBox is used in a DataTemplate, and none of my implicit ListBox styles override the default visual style. For some reason, the ItemsPanelTemplate I'm specifiying for the control (a WrapPanel) is being ignored and a StackPanel is used instead.
This is the entire template, I can only assume there's something I'm missing which is causing this.
<DataTemplate x:Key="GroupLargeIconsTemplate" DataType="{x:Type Core:IGroup}">
<ListBox ItemsSource="{Binding Children}" OverridesDefaultStyle="True">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel HorizontalAlignment="Left" VerticalAlignment="Top" IsItemsHost="True" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto"
Width="{Binding (FrameworkElement.ActualWidth), RelativeSource={RelativeSource AncestorType=ScrollContentPresenter}}" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<DataTemplate.Resources>
<conv:IconConverter x:Key="IconConverter"/>
</DataTemplate.Resources>
<StackPanel Margin="2" Width="100" Height="140">
<Image Source="{Binding Icon,Converter={StaticResource IconConverter},ConverterParameter=96}"/>
<TextBlock Text="{Binding Name}" TextWrapping="Wrap" TextTrimming="CharacterEllipsis" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</DataTemplate>
My guess is that the width property in the WrapPanel is making it behave as a Stackpanel.
Strange, the control template is not supposed to override the explicitly specified values, rather the opposite scenario comes to my mind...
That is, unless the control template provides a panel with "IsItemsHost" set to true. Then the ItemsPanel is ignored. Which, probably, is your case.