I have a ListBox on a WPF form, with the following look:
<ListBox x:Name="myListBox" Width="200" Height="200" Background="White">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Name}" FontSize="16" FontStyle="Italic"/>
<Image Source="Images/myImage.png"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
How would I go about adding this to a Template/Style so that all of the ListBoxes can reference one template and all have the same look?
I am confused as how to go about creating a template,
Thanks
Make the DataTemplate a resource which you can place in an appropriately scoped Resources collection:
<UserControl.Resources>
<DataTemplate x:Key="MyDataTemplate">
....
</DataTemplate>
</UserControl.Resources>
You can then access the resource in you ListBox:
<ListBox ItemTemplate="{StaticResource MyDataTemplate}">
Alternatively, you can add the DataTemplate as part of a Style:
<Style TargetType="{x:Type ListBox}" x:Key="MyStyle">
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
...
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
<ListBox Style="{StaticResource MyStyle}">
You can also implictly target all ListBox instances by dropping the x:Key in the Style.
Every framework-level element has a Resources collection, up to the application level, so choose the appropriate collection to target elements at the appropriate scope. Also read about static and dynamic resources and which is the most appropriate markup extension to use for you.
Related
I'm trying to do some XAML binding for the Windows Phone (targeting WP7.1) and I have a collection of checkboxes that I want to display. I want to put them inside the WrapPanel
What control(s) would I use to bind to a collection of checkboxes? I don't see an ItemSource for the WrapPanel. So I'm not sure what I would use.
<ListBox Height="auto" Name="lbAssignments" BorderThickness="1" BorderBrush="Black" ItemsSource="{Binding DataList}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical">
<TextBlock x:Name="TextBlock" Text="{Binding Title}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,0,0,10" FontSize="26.667" TextWrapping="Wrap"/>
<TextBlock x:Name="TextBlock1" Text="{Binding Title}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,0,0,10" FontSize="26.667" TextWrapping="Wrap"/>
<toolkit:WrapPanel Height="400" Width="400">
<!--collection of checkboxes-->
</toolkit:WrapPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Binding to a collection of UI controls is not exactly the thing you'd want to do. Instead, I would recommend binding to a collection. For many reasons - performance, memory allocation and general maintenance/flexibility.
Since you mentioned that you have a List<string>, you can just bind it to a ListBox:
<ListBox ItemsSource="{Binding YourList}">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding}"></CheckBox>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
However, you can still proceed with biding an element to a collection of other elements, given that appropriate support exists. You could use an ItemsControl:
<ItemsControl ItemsSource="{Binding ElementName=myPage, Path=SomeCollection}">
</ItemsControl>
Here, SomeCollection might as well be ObservableCollection<CheckBox>.
i would like know how can i add a style when a item of the listbox is selected.
I have the following listbox:
<ListBox x:Name="ListBoxDays"
VerticalAlignment="Top"
ItemTemplate="{StaticResource WeekDayTemplate}"
ItemsSource="{Binding WeekDayList}" />
And i also have a DataTemplate to the listbox.
<phone:PhoneApplicationPage.Resources>
<DataTemplate x:Key="WeekDayTemplate">
<StackPanel x:Name="stackPanel" Orientation="Horizontal" Width="400" Margin="12,0,0,10" Height="100" >
<StackPanel VerticalAlignment="Center" Orientation="Vertical">
<TextBlock Text="{Binding WeekDayName}" Style="{StaticResource PhoneTextExtraLargeStyle}" TextWrapping="Wrap" TextTrimming="WordEllipsis" Foreground="{StaticResource PhoneRadioCheckBoxPressedBorderBrush}" UseLayoutRounding="True" />
<TextBlock Text="{Binding ShortDate}" Style="{StaticResource PhoneTextTitle2Style}" TextWrapping="Wrap" TextTrimming="WordEllipsis" Foreground="{StaticResource PhoneBorderBrush}" Margin="25,0,12,0" />
</StackPanel>
</StackPanel>
</DataTemplate>
</phone:PhoneApplicationPage.Resources>
At the moment when i select an item of the listbox no color change happens.
You have to change the style of the template ListBoxItem which the ListBox generates for each of the items that it renders. Your updated template needs to customise the Selected visual state. You can then associate this new template with your ListBox via the ListBox.ItemContainerStyle property.
There is a good tutorial, with sourcecode to download, here:
http://windowsphonegeek.com/tips/How-to-customize-the-WP7-ListBox-Selected-Item--Part1-Control-Template
i binded some items to listbox.whenever click on particular listitem i want to display that subitems in another page.
Please tell me how to acheive this.
how to get the listitem id whenever click on particular list item ?
To clarify (in case you don't feel like creating a new DataBound application and just want the answer), instead of depending on the click event for a listbox item, you should be looking at the selectionchanged event for the list box itself.
eg:
<ListBox SelectionChanged="MainListBox_SelectionChanged">
// Handle selection changed on ListBox
private void MainListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// If selected index is -1 (no selection) do nothing
if (MainListBox.SelectedIndex == -1)
return;
// Navigate to the new page
NavigationService.Navigate(new Uri("/DetailsPage.xaml?selectedItem=" + MainListBox.SelectedIndex, UriKind.Relative));
// Reset selected index to -1 (no selection)
MainListBox.SelectedIndex = -1;
}
Look at the code created as part of a new DataBound application. It does just this.
MVVM solution
Use the following libraries:
xmlns:GalaSoft_MvvmLight_Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP71"
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit" <-- (optional, only for the ContextMenu)
XAML Example:
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox x:Name="categoryListBox" Margin="0,0,-12,0" ItemsSource="{Binding CategoryItems}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel x:Name="stackPanel" Margin="0,0,0,17" Width="432" Height="78">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Tap">
<GalaSoft_MvvmLight_Command:EventToCommand
Command="{Binding Main.OpenCategoryCommand, Source={StaticResource Locator}, Mode=OneWay}"
CommandParameter="{Binding Mode=OneWay}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu>
<toolkit:MenuItem Header="Remove" />
<toolkit:MenuItem Header="Show" />
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
<TextBlock Text="{Binding Name}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Text="{Binding Note}" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
For a simple command binding MVVM style to an item in a list, you can also enclose the whole item template in a button and hook up the Command property of the button like this:
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Button Command="{Binding Path=SomeCommandOnItemViewModel, Mode=OneWay}">
<Button.Template>
<ControlTemplate>
<!-- Your listitem styling goes here -->
</ControlTemplate>
</Button.Template>
</Button>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
What is the easiest way to set the font size of the panorama item header once so it can be used for all item headers in my app?
There isn't a way to automatically do it for all headers in your app yet. You'll need to set the style for each one.
Implicit styling is coming in the Mango update and that should allow this to be done then.
Update
Here's what you can do now.
Create a global template style for the FontSzie you want. Something like:
<Application.Resources>
<DataTemplate x:Key="MyItemHeaderTemplate">
<Grid>
<ContentPresenter>
<TextBlock Text="{Binding}" FontSize="20" />
</ContentPresenter>
</Grid>
</DataTemplate>
</Application.Resources>
Then in every PanoramaItem that I wish to have styled this way I set the HeaderTemplate:
<controls:PanoramaItem Header="first" HeaderTemplate="{StaticResource MyItemHeaderTemplate}">
// ...
</controls:PanoramaItem>
This had been a difficult issue for me as well. However I have found a pretty simple solution to take care of this for each head item you wantto resize/fontweight/font...so-on. I have inserted a snippet from a current project I have been working on. Take notice to the xaml portion for controls:PanoramaItem.HeaderTemplate. This is where the templete is modified for the header item. Good Luck!
<!--Panorama item one-->
<controls:PanoramaItem Header="Locations">
<Grid>
<ListBox Height="498" HorizontalAlignment="Left" Margin="2,0,0,0" Name="listBox1" VerticalAlignment="Top" Width="424" />
</Grid>
<controls:PanoramaItem.HeaderTemplate>
<DataTemplate>
<TextBlock Text="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" FontSize="55" FontFamily="Segoe WP Bold" Foreground="Black" TextAlignment="Left" FontWeight="Normal" FontStyle="Italic" />
</DataTemplate>
</controls:PanoramaItem.HeaderTemplate>
</controls:PanoramaItem>
Maybe you could try putting this in under the <controls:Panorama> :
<controls:Panorama.TitleTemplate>
<DataTemplate>
<TextBlock Text="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" FontSize="150" Margin="0,20,0,0" FontWeight="Bold" />
</DataTemplate>
</controls:Panorama.TitleTemplate>
Found here: http://www.jstawski.com/archive/2010/10/25/change-windows-phone-7-panoramarsquos-control-title.aspx
You can create your own PanoramaItem Control and use generic.xaml to apply your custom PanoramaItem style.
public class MyPanoramaItem : Microsoft.Phone.Controls.PanoramaItem
{
public MyPanoramaItem()
{
DefaultStyleKey = typeof(MyPanoramaItem);
}
}
Then you create Themes\Generic.xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:YourProjectNamespace">
<Style TargetType="local:MyPanoramaItem">
<!—your custom PanoramaItem style-->
</Style>
</ResourceDictionary>
And then use your custom Panorama like this:
xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls"
xmlns:local="clr-namespace:YourProjectNamespace"
<Grid x:Name="LayoutRoot" Background="Transparent">
<!--Panorama control-->
<controls:Panorama Title="my application">
<controls:Panorama.Background>
<ImageBrush ImageSource="PanoramaBackground.png"/>
</controls:Panorama.Background>
<!--Panorama item one-->
<local:MyPanoramaItem Header="first item">
</ local:MyPanoramaItem >
</controls:Panorama>
More about generic.xaml and its usage you can find here.
I noticed a very strange behavior:
in my windows phone 7 I have a ListBox that can contain anything from 1-2 to 2-300 items.
I noticed that when the number of items is big (not sure about the number but for sure >150 items) the OnSelectionChanged event is not raised.
This is the XAML of my listbox
<ListBox ItemsSource="{Binding Path=Posts}" ItemTemplate="{StaticResource IconsWithText}"
ScrollViewer.VerticalScrollBarVisibility ="Disabled"
SelectionChanged="ListBox_SelectionChanged" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
And the template for the ItemTemplate is:
<DataTemplate x:Name="IconsWithText">
<Grid x:Name="ThumLink" Width="160" Height="140" Margin="10" Background="#FF666666">
<Image Source="Resources/Images/All.png" Visibility="{Binding Path=VisibilityAll}" />
<Image delay:LowProfileImageLoader.UriSource="{Binding Picture}"
Visibility="{Binding Path=VisibilityPic}"
Stretch="UniformToFill" VerticalAlignment="Top" HorizontalAlignment="Left" />
<Border x:Name="border" VerticalAlignment="Bottom" Background="#d9ffffff" Height="62" BorderBrush="Black" Visibility="{Binding Path=VisibilityPic}" >
<TextBlock x:Name="textBlock" Text="{Binding Title}" VerticalAlignment="Top" TextWrapping="Wrap" MaxHeight="60" Style="{StaticResource PhoneTextSmallStyle}"
Foreground="Black" FontSize="20" Margin="4,1,4,0" Height="62"/>
</Border>
</Grid>
</DataTemplate>
Is this a bug or did I do something wrong? I was in debug and the event handler never gets called, but it works when the items are not many.
Simone
The problem with using the plain StackPanel is that all visual object will be created and added to the StackPanel which will be very expensive in terms of memory and may trip over other limits in the rendering system.
Try changing to:-
<VirtualisingStackPanel Orientation="Horizontal" />
So far though I've not been able to reproduce your problem with 300 items even using a plain StackPanel.