I have ListBox with group style:
<GroupStyle HidesIfEmpty="True" x:Key="GroupStyle">
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Margin" Value="0,0,0,5"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True" BorderBrush="#FFA4B97F" BorderThickness="0,0,0,1">
<Expander.Header>
<DockPanel Background="LightSkyBlue"
Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Expander}},
Path=ActualWidth}">
<TextBlock FontWeight="Bold" Text="{Binding Path=Name}" Margin="5,0,0,0" Width="100"/>
<TextBlock FontWeight="Bold" Text="{Binding Path=ItemCount}"/>
</DockPanel>
</Expander.Header>
<Expander.Content>
<ItemsPresenter/>
</Expander.Content>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
Any change in bound collection causes expanders to reopen.
Is there any way to remember user preferences and leave expanders folded?
The question is what you are doing with the bound collection.
I agree with Nikolay that the best option is to have your viewmodel have a property that you will bind the expander to.
As for the question I've asked at the beginning: Are you somewhat refreshing the CollectionView?
Refresh causes the UI to be recreated. (Meaning, it is like Reset on an ObservableCollection. It tells the UI to create the user controls and load the XAML of your templates again which is bad for performance).
I can suggest a simple hack - just add IsExpanded property to your model class and bind Expander.IsExpanded to it.
Related
After several hours I gave up.
I have the following ListView (in Grid) with GroupStyle defined inside of it.
I want to take it out somehow and put it in a Template or Style (I'm confused) and then add it to my main Style of the ListView (ListViewSimpleStyle).
This way it will be reusable in other places instead of copy-paste it every time.
How do I do it?
<ListView Name="LvDataBinding" Grid.Row="0"
Style="{StaticResource ListViewSimpleStyle}">
<!-- Define the grouping-->
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<TextBlock FontSize="12" Text="{Binding Name}"
Foreground="{StaticResource GrayForgroundBrush}"></TextBlock>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
Thanks
Groupstyle is style of Groupbox so we need to edit style of Groupbox and I have changed GroupBox HeaderTemplate as you want to change HeaderTemplate of GroupStyle.
Visit this:http://msdn.microsoft.com/en-us/library/ms754027(v=vs.90).aspx
and Add GroupBox With Its style in your own listview template style i.e ListViewSimpleStyle
<Style x:Key="ListViewSimpleStyle" TargetType="ListView">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListView">
<Grid Background="AliceBlue" >
<GroupBox>
<GroupBox.Style>
<Style TargetType="GroupBox">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<TextBlock FontSize="12" Text="{Binding Name}" Foreground="{StaticResource GrayForgroundBrush}"/>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupBox.Style>
</GroupBox>
<ItemsPresenter></ItemsPresenter>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
i have a Listbox, which stores two different object types, based on the same baseclass. (e.g. BaseObject = baseclass and the children of it: CustomPath and CustomImage)
The Datasource:
ObservableCollection<BattlegroundBaseObject> _baseObjectCollection;
public ObservableCollection<BattlegroundBaseObject> BaseObjectCollection
{
get { return _baseObjectCollection?? (_baseObjectCollection= new ObservableCollection<BaseObject>()); }
}
The Listbox databinding: <ListBox ItemsSource="{Binding BaseObjectCollection}"
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem" x:Name="ListBoxPathLineStyle">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem" x:Name="BattlegroundObjectControlTemplate">
<Path Stroke="{Binding ObjectColor}" StrokeThickness="{Binding StrokeThickness}" Data="{Binding PathGeometryData}" x:Name="PathLine" Opacity="{Binding Opacity}">
</Path>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Effect" TargetName="PathLine">
<Setter.Value>
<DropShadowEffect Color="CornflowerBlue" ShadowDepth="3" BlurRadius="10" />
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
I want to add to the ControlTemplate where the Path is, also a Image and to differ it by type or a property. doesnt matter.
anyone any ideas?
You can add to ListBox resources DataTemplate for each type.
In my example classes Car and Motorbike derived from Vehicle class.
<ListBox x:Name="listBox">
<ListBox.Resources>
<DataTemplate DataType="{x:Type local:Car}">
<StackPanel Background="Red">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type local:Motorbike}">
<StackPanel Background="Orange">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ListBox.Resources>
</ListBox>
EDIT:
You can add style for ListBoxItem to resources:
<ListBox x:Name="listBox">
<ListBox.Resources>
<Style TargetType="ListBoxItem">
<Style.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Effect">
<Setter.Value>
<DropShadowEffect Color="CornflowerBlue" ShadowDepth="3" BlurRadius="10" />
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
<DataTemplate DataType="{x:Type local:Car}">
<StackPanel Background="Red">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type local:Motorbike}">
<StackPanel Background="Orange">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ListBox.Resources>
</ListBox>
You could define some DataTemplates for your different classes. They determine how the classes are displayed. I've been using them to display derived classes differently when working with a collection of the base class.
<DataTemplate DataType="{x:Type CustomPath}">
<TextBlock Text="This is a CustomPath"/>
</DataTemplate>
<DataTemplate DataType="{x:Type CustomImage}">
<TextBlock Text="This is a CustomImage"/>
</DataTemplate>
At the moment you are changing the style of the controls that WPF is using to render your bound data. A better way to do this is to provide WPF with a way of generating the correct controls. Ignore the ListBoxItem and use DataTemplates for your actual objects.
First you need to tell the Window or control how to find your types.
<Window or UserControl
...
xmlns:model="clr-namespace:yourNamespace"
>
Then you can provide WPF with a way to show your objects e.g.
<DataTemplate TargetType="{x:Type model:CustomPath}">
<Path Stroke="{Binding ObjectColor}" StrokeThickness="{Binding StrokeThickness}"
Data="{Binding PathGeometryData}" x:Name="PathLine" Opacity="{Binding Opacity}"/>
<!-- maybe use a binding from the Path.Effect back to the IsSelected and ValueConverters
to re-apply the selection effect-->
</DataTemplate>
<DataTemplate TargetType="{x:Type model:CustomImage}">
<Image Src="{Binding SomeProperty}" />
</DataTemplate>
Now all you need to do is to make these available to the ListBox in some way. Almost every element in WPF can have .Resources added to it, so you could choose to do these across the entire window
<Window ...>
<Window.Resources>
<DataTemplate .../>
<DataTemplate .../>
</Window.Resources>
...
<ListBox .../>
</Window>
or you can apply it more locally
<Window ...>
...
<ListBox>
<ListBox.Resources>
<DataTemplate .../>
<DataTemplate .../>
</ListBox.Resources>
</ListBox>
</Window>
And this way your listbox definition can become much neater too, e.g. if you are using Window.Resources
<ListBox ItemsSource="{Binding BaseObjectCollection}"/>
I have a listbox with an expander inside the ItemTemplate. I managed to bind the expander's IsExpanded property to the ListBoxItem's IsSelected property ok. Now I want to apply a style to the ListBoxItem's content also bound to the IsSelected property.
<ListBox.ItemTemplate>
<DataTemplate>
<Border Name="myBorder">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Description}" />
<StackPanel Orientation="Horizontal">
<TextBlock Text="Date:"/>
<TextBlock Text="{Binding Date}"/>
</StackPanel>
<dx:DXExpander Name="expanderDetails"
IsExpanded="{Binding Mode=TwoWay, Path=IsSelected,
RelativeSource={RelativeSource AncestorType=ListBoxItem, Mode=FindAncestor}}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="Count:"/>
<TextBlock Text="{Binding Count}"/>
</StackPanel>
</dx:DXExpander>
</StackPanel>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
What I want to do is somehow set the style of the "myBorder" Border to "NotSelectedBorderStyle" for unselected ListBoxItems, and to "SelectedBorderStyle" for the SelectedItem (ListBox with single selection).
FYI, the styles define background, border and that kind of stuff, just to make the clear which item is selected, nothing fancy in these styles.
I tried the accepted answer here but if I completely switch styles I loose the nice expanding animation my DXExpander has.
I guess there must be some solution using triggers, but I can't just hit the right spot.
Finally I got it, I'm posting it here in the hope that this will save someone else time and pain :-P
This code does some additional things: the EventSetter and the corresponding Handler method are there to capture clicks to the elements inside the DataTemplate, in order to select the ListBoxItem which contains the element (if you don't you might type text inside an item, while a different one is selected).
The inner Border ("myBorder") is just a container for the stackpanels, I had to wrap everything inside another border ("backgroundBorder") which gets the style changed when the ListBoxItem gets selected.
<Style x:Key="FocusedContainer" TargetType="{x:Type ListBoxItem}">
<Setter Property="Background" Value="LightGray"/>
<EventSetter Event="GotKeyboardFocus" Handler="OnListBoxItemContainerFocused" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="backgroundBorder" Width="Auto" Style="{StaticResource NotSelectedBorderStyle}">
<ContentPresenter Content="{TemplateBinding Content}">
<ContentPresenter.ContentTemplate>
<DataTemplate>
<Border Name="myBorder">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Description}" />
<StackPanel Orientation="Horizontal">
<TextBlock Text="Date:"/>
<TextBlock Text="{Binding Date}"/>
</StackPanel>
<dx:DXExpander Name="expanderDetails"
IsExpanded="{Binding Mode=TwoWay, Path=IsSelected,
RelativeSource={RelativeSource AncestorType=ListBoxItem, Mode=FindAncestor}}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="Count:"/>
<TextBlock Text="{Binding Count}"/>
</StackPanel>
</dx:DXExpander>
</StackPanel>
</Border>
</DataTemplate>
</ContentPresenter.ContentTemplate>
</ContentPresenter>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="backgroundBorder" Property="Style" Value="{StaticResource SelectedBorderStyle}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Then I set the ItemContainerStyle in my ListBox to the above style:
<ListBox Background="#7FFFFFFF" HorizontalContentAlignment="Stretch"
ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True"
ItemContainerStyle="{StaticResource FocusedContainer}"/>
To finish, the code behind for the GotKeyBoardFocus handler:
private void OnListBoxItemContainerFocused(object sender, RoutedEventArgs e)
{
(sender as ListBoxItem).IsSelected = true;
}
A mess in code, but pretty neat in the UI. Hope this helps someone!
I have ListBox with custom template, how do programmatically scroll it down to bottom?
Automatic Scrolling in a Silverlight List Box describes method of scrolling to bottom of ListBox. Unfortunately this method does not work with ListBox with custom style template.
Have anyone success to scroll ListBox with custom style?
Problem code:
<Grid.Resources>
<Style x:Key="HorizontalWrapListBox" TargetType="ListBox">
<Style.Setters>
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<toolkit:WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBox">
<ScrollViewer>
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
</Grid.Resources>
<ListBox x:Name="MyListBox" Margin="0,0,-12,0" ItemsSource="{Binding Items}"
Style="{StaticResource HorizontalWrapListBox}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,0,0,17" Width="432" Height="78">
<TextBlock Text="{Binding LineOne}" TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Text="{Binding LineTwo}" TextWrapping="Wrap"
Margin="12,-6,12,0"
Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
You need to keep correct naming of your template parts and this could just start working. The ScrollViewer should be named x:Name="ScrollViewer". Check
ListBox Styles and Templates,
Customizing the Appearance of an Existing Control by Using a ControlTemplate,
TemplatePartAttribute
I'm trying to write a UserControl to display a list of items where each of these items is a title and a group of checkboxes. This whole will represent a form of data where the person filling it in is answering a list of questions with a 1 to 4 value. This all works and binds nicely to the window's ViewModel.
But I've currently got the answers hardcoded in the UserControl as follows:
<ListBox
ItemsPanel="{StaticResource HorizontalScores}"
Style="{StaticResource styleOuterListBox}"
ItemContainerStyle="{StaticResource styleOuterListBoxItem}">
<ListBoxItem>Never</ListBoxItem>
<ListBoxItem>Sometimes</ListBoxItem>
<ListBoxItem>Often</ListBoxItem>
<ListBoxItem>Always</ListBoxItem>
</ListBox>
I would like to set these from the window's XAML or from the ViewModel as they will be different for other forms but can't see the correct incantation. How do I remove the ListBoxItems from the UserControl and use databinding instead?
BigEdit ...
Ok, this is the actual user control (it looks hideous but that's not the point):
<UserControl x:Class="BussPerry.Scorer" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:BussPerry.ViewModel" xmlns:local="clr-namespace:BussPerry">
<UserControl.Resources>
<SolidColorBrush x:Key="SelectedBackgroundBrush" Color="Gray" />
<SolidColorBrush x:Key="SelectedForegroundBrush" Color="Red" />
<ItemsPanelTemplate x:Key="HorizontalScores">
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
<Style x:Key="styleListBox" TargetType="{x:Type ListBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBox}">
<ItemsPresenter Margin="2" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="styleListBoxItem" TargetType="{x:Type ListBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<CheckBox Name="CheckBox" Padding="1" Width="60"
IsChecked="{Binding Path=IsSelected, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}">
<ContentPresenter HorizontalAlignment="Center"/>
</CheckBox>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="CheckBox" Property="Background" Value="{StaticResource SelectedBackgroundBrush}" />
<Setter TargetName="CheckBox" Property="Foreground" Value="{StaticResource SelectedForegroundBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<ListBox ItemsPanel="{StaticResource HorizontalScores}" Style="{StaticResource styleListBox}"
ItemContainerStyle="{StaticResource styleListBoxItem}" SelectedIndex="{Binding Path=Score}">
<ListBoxItem>Never</ListBoxItem>
<ListBoxItem>Sometimes</ListBoxItem>
<ListBoxItem>Often</ListBoxItem>
<ListBoxItem>Always</ListBoxItem>
</ListBox>
</UserControl>
And it's being called as follows:
<ListView
Name="listviewScores"
ItemsSource="{Binding Path=Scores}"
Margin="5"
BorderThickness="0"
Background="Transparent"
Focusable="False"
Grid.Row="3">
<ListView.View>
<GridView
ColumnHeaderContainerStyle="{StaticResource styleHiddenHeader}">
<GridView.Columns>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock
Text="{Binding Path=Index}"
HorizontalAlignment="Right" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn
DisplayMemberBinding="{Binding Path=Title}" />
<GridViewColumn >
<GridViewColumn.CellTemplate>
<DataTemplate>
<local:Scorer >
</local:Scorer>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
What I want to do is to move the Never/Sometimes/Often/Always listboxitems from being hard coded in the user control to be databound.
(Suggestions of "you don't want to do it like that" are also welcome!)
(one year later...)
I think your question is similar to mine. I have come up with a technique to expose the ItemsSource of an inner control on a UserControl. The link to my question is here:
Exposing inner Control properties for binding in WPF
I know that my solution works. What I don't know is if it violates some sacred 'best practices' out there in WPF. It 'feels' right though.
Do you want to bind a collection to a listbox?
It's pretty simple...
<ListBox ItemsSource="{Binding Answers}" />
where Answers is your collection exposed in your ViewModel.
If you're having trouble creating a custom control that exposes an ItemsSource, then you just need to inherit from ItemsControl instead of just UserControl.
EDIT:
Some assumptions:
the DataContext of the ListBox, custom control, or higher parent element is set to your
ViewModel.
the ViewModel has a
property called "Answers".
the Answers property implements
IEnumerable<>.