I have a listbox on a usercontrol which is populated by a xml file.
<Machines xmlns="">
<Machine Name="Prod1" IP="192.168.1.200" isDefault="true" InstanceName="sql08" />
<Machine Name="Prod2" IP="192.168.1.101" />
<Machine Name="Test1" IP="192.168.1.103" />
<Machine Name="Test2" IP="192.168.1.104" />
</Machines>
I would like to bind the Listbox's Selected Item to the Machine which has a isDefault=true attribute.
My current xmldataprovider and ItemTemplate are listed below along with my ListBox markup. I was not sure if I needed to do some xpath binding in the datatemplate, or if I should make an explicit style with a trigger for this task? Or if either of those approaches would even work? One of the things I can't understand is how I can bind to an attribute that only exists on one node of my file.
<XmlDataProvider x:Key="DataList" Source="XML\ListboxSettings.xml" XPath="Machines/Machine"/>
<DataTemplate x:Key="MachineDataTemplate">
<TextBlock Text="{Binding XPath=#Name}" ToolTip="{Binding XPath=#IP}" />
</DataTemplate>
<ListBox Name="MerlinsListbox" Margin="5" Height="{Binding Height, ElementName=border}" Background="#FF252525" FontFamily="Consolas" FontSize="16" Foreground="#FFFBF9F9"
ItemsSource="{Binding}"
ItemTemplate="{StaticResource MerlinDataTemplate}"
IsSynchronizedWithCurrentItem="true"/>
Two possible ways you could handle this are as follows:
1) You could set the ItemContainerStyle and bind the ListBoxItem's IsSelected property to the #isDefault attribute.
<ListBox Name="MerlinsListbox" Margin="5"
Background="#FF252525" FontFamily="Consolas" FontSize="16" Foreground="#FFFBF9F9"
ItemsSource="{Binding Source={StaticResource DataList}}"
ItemTemplate="{StaticResource MachineDataTemplate}"
IsSynchronizedWithCurrentItem="true">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="IsSelected" Value="{Binding XPath=#isDefault, Mode=OneTime}"/>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
Or 2) add a trigger for the ItemContainerStyle:
<ListBox ...>
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Style.Triggers>
<DataTrigger Binding="{Binding XPath=#isDefault}" Value="true">
<Setter Property="IsSelected" Value="True"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
Related
I have two custom ItemTemplates for the ListBox, one for the regular items, and one for the selected item. An example of how would I handle this is:
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="ContentTemplate" Value="{StaticResource Template1}" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="ContentTemplate" Value="{StaticResource Template2}" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
Template1 and Template2 are very similar:
<DataTemplate x:Key="Template1">
<SameContent />
<DifferentContent1 />
</DataTemplate>
<DataTemplate x:Key="Template2">
<SameContent />
<DifferentContent2 />
</DataTemplate>
So, is it a proper way to duplicate the code for the SameContent (which is like a bunch of TextBlocks, Panels, etc) in both templates, or it is a better approach to have only one template, but switch the DifferentContent based on the IsSelected property, or...?
if second approach, how would it be properly done?
Obviously duplicating the code is not a very good solution. A better approach is to define another DataTemplate as your common content and then use ContentPresenter to present it:
<Window.Resources>
<DataTemplate x:Key="CommonTemplate">
<TextBlock Text="{Binding CommonProperty1}" />
<TextBlock Text="{Binding CommonProperty2}" />
</DataTemplate>
<DataTemplate x:Key="Template1" >
<StackPanel>
<ContentPresenter ContentTemplate="{StaticResource CommonTemplate}"/>
<TextBlock Text="{Binding Template1Property1}"/>
<TextBlock Text="{Binding Template1Property2}"/>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="Template2" >
<StackPanel>
<ContentPresenter ContentTemplate="{StaticResource CommonTemplate}"/>
<TextBlock Text="{Binding Template2Property1}"/>
<TextBlock Text="{Binding Template2Property2}"/>
</StackPanel>
</DataTemplate>
</Window.Resources>
I have a Resource Dictionary in which I want to have a common DataTemplate for ComboBox.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<DataTemplate DataType="{x:Type ComboBox}">
<StackPanel Orientation="Horizontal">
<!--Here I need to use something like For Loop-->
<TextBlock Text=""></TextBlock>
</StackPanel>
</DataTemplate>
</ResourceDictionary>
Now I have created a dependency property of type integer named NoOfColumns. While declaring the comboBox I need to set the NoOfColumns property to automatically generate that number of columns. I want them to databind.
Update as requested by Joe
<ComboBox x:Name="cbUnder" ItemsSource="{Binding GroupsAndCorrespondingEffects}"
IsEditable="True" SelectedItem="{Binding SelectedGroup, Mode=TwoWay}"
Text="{Binding InputValue, UpdateSourceTrigger=PropertyChanged}" TextSearch.TextPath="GroupName"
Grid.Column="1" Grid.ColumnSpan="4" Grid.Row="3">
<ComboBox.Resources>
<DataTemplate DataType="{x:Type vm:GroupAndCorrespondingEffect}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding GroupName}" Width="250">
<TextBlock.Style>
<Style TargetType="TextBlock">
<Style.Triggers>
<DataTrigger Binding="{Binding IsHighlighted}" Value="True">
<Setter Property="Foreground" Value="Blue" />
<Setter Property="FontWeight" Value="Bold"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
<TextBlock Text="{Binding CorrespondingEffect}" />
</StackPanel>
</DataTemplate>
</ComboBox.Resources>
</ComboBox>
There's nothing like for in XAML, but ItemsControl is very much like foreach. Instead of setting an int property, make an ObservableCollection<T> and add that many objects to it, and then bind the ItemsControl to your collection property.
This has the added benefit that each collection item can expose properties to be bound, e.g. if you wanted to display different text in each TextBlock, you could put a property on your collection item and bind the TextBlock to that property.
I'm trying to assign DataContext to a MenuItem, which is part of ListBox.
<Style x:Key="ContextMenuStyle" TargetType="telerik:RadMenuItem">
<Setter Property="DataContext" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=telerik:RadListBox}, Path=DataContext}" />
</Style>
<DataTemplate x:Key="TemplateSelector">
<ContentPresenter Content="{Binding}" Name="contentPresenter">
<telerik:RadContextMenu.ContextMenu>
<telerik:RadContextMenu>
<telerik:RadMenuItem Header="Connect" Click="RadMenuItem_Click" Style="{StaticResource ResourceKey=ContextMenuStyle}" />
<telerik:RadMenuItem Header="Disconnect" />
<telerik:RadMenuItem Header="Delete Database" />
</telerik:RadContextMenu>
</telerik:RadContextMenu.ContextMenu>
</ContentPresenter>
</DataTemplate>
<Grid>
<telerik:RadListBox x:Name="lsbDevices" ItemsSource="{Binding Path=Devices}" ItemTemplate="{StaticResource TemplateSelector}"
SelectedItem="{Binding SelectedDevice, Mode=TwoWay}" Grid.Row="0" />
</Grid>
Here's what I do. RadListBox's DataContext is set to my ViewModel. I want to assign this ViewModel to every RadMenuItem's DataContext through ContextMenuStyle, but it's not working. RadListBox's DataContext is properly set to my modelview, but RadMenuItem's datacontext is null. What am I missing?
Thanks
ContextMenus are not part of the same VisualTree as the rest of the UI, so your RelativeSource binding is not finding the ListBox
You can find the UI object the ContextMenu is attached to by using the PlacementTarget property of the ContextMenu
<Style x:Key="ContextMenuStyle" TargetType="telerik:RadMenuItem">
<Setter Property="DataContext" Value="{Binding PlacementTarget.DataContext,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type telerik:RadContextMenu}}}" />
</Style>
I want to present a listbox with TextBlocks as items. When the user clicks/selects an item it changes into a TextBox for editing. As soon as the controls loses focus the item would turn back to a TextBlock.
The following XAML is almost working in that the TextBlock does turn into a TextBox when it's selected. It also turns back to a TextBlock if I select another item on the list. The problem is that if I move out of the listbox (in this case to the Add New text box) the list item stays as a TextBox.
The question ( WPF ListViewItem lost focus event - How to get at the event? ) looked promising but I can't make it work. I tried using the IsFocused property but then I wasn't able to edit the textbox because when I got into the textbox the listboxitem would go out of focus and thus turning back to a TextBlock before I had a chance to edit the text.
How can I make the TextBox turn back to TextBlock if the listbox/item loses the focus?
(Any other implementation that accomplishes the goal are also welcomed)
<Window x:Class="MyView.MainWindow1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
Title="MainWindow1" Height="300" Width="200">
<Window.Resources>
<DataTemplate x:Key="ItemTemplate">
<TextBlock Text="{Binding Name}" />
</DataTemplate>
<DataTemplate x:Key="SelectedTemplate">
<TextBox Text="{Binding Name, Mode=TwoWay}" />
</DataTemplate>
<Style TargetType="{x:Type ListBoxItem}" x:Key="ContainerStyle">
<Setter Property="ContentTemplate" Value="{StaticResource ItemTemplate}" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="ContentTemplate" Value="{StaticResource SelectedTemplate}" />
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<StackPanel >
<ListBox ItemsSource="{Binding Departments}" HorizontalContentAlignment="Stretch"
ItemContainerStyle="{StaticResource ContainerStyle}" />
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBox Text="{Binding NewDepartmentName, Mode=TwoWay}" />
<Button Grid.Column="1" Width="50" Content="Add" Command="{Binding Path=AddNewDepartmentCommand}" />
</Grid>
</StackPanel>
</Window>
This doesn't answer your question, but gives an alternative solution by making a textbox look like a textblock when the listboxitem isn't selected:
<Page.Resources>
<ResourceDictionary>
<Style x:Key="ListBoxSelectableTextBox" TargetType="{x:Type TextBox}">
<Setter Property="IsHitTestVisible" Value="False" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}, AncestorLevel=1}}" Value="True">
<Setter Property="IsHitTestVisible" Value="True" />
</DataTrigger>
</Style.Triggers>
</Style>
</ResourceDictionary>
</Page.Resources>
<Grid>
<ListBox ItemsSource="{Binding Departments}" HorizontalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBox Margin="5" Style="{StaticResource ListBoxSelectableTextBox}" Text="{Binding Name}" BorderBrush="{x:Null}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
There are many ways you can do this:
Above answer
Create a TextBox style based on TextBoxBase such that when disabled, it makes the TextBox look like a TextBlock by setting the BorderThickness="0", Background="transparent"
Have both TextBlock and TextBox on each ListViewItem and using the above answer technique hide and show the TextBlock/TextBox accrodingly
I am only two weeks into WPF so this is probably a trivial question. I have a collection "CellList" which has a few properties I would like to bind to a ToolTip so when I hover over a label information from the current instance of CellList is displayed. How do I do that? I understand simple binding and this maybe simple binding too but I can't wrap my head around it. Below is my XAML for the label. Could someone explain to me how I can accomplish this.
<HierarchicalDataTemplate>
<ListBox ItemsSource="{Binding CellList}">
<ListBox.ItemTemplate>
<DataTemplate>
<Label Content=" " Height="20" Width="15" Background="{Binding Path=ExptNameBkg, Converter={StaticResource ExptNameToBrushConverter}}" BorderBrush="Black" BorderThickness="1" >
</Label>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</HierarchicalDataTemplate>
Thanks.
The tricky thing about ToolTips is that a ToolTip is an object you associate with a control, and not part of the control's visual tree. So you can't populate it the way you'd populate things in the visual tree, e.g.:
<TextBox.ToolTip>
<StackPanel>
...put bound controls here
</StackPanel>
</TextBox.ToolTip>
Instead, what you have to do is create a specific instance of a ToolTip, and assign it a style that sets its DataContext (very important; that's how you can bind to the properties of the data source of its "placement target," i.e. the control that's displaying the tooltip) and its Template. Then put the visual tree of the ToolTip, including bindings, into the template. Finally, reference the ToolTip in your control.
So, here's a TextBox whose Binding does validation:
<TextBox ToolTip="{StaticResource ErrorToolTip}">
<TextBox.Text>
<Binding Source="SourceProperty">
<Binding.ValidationRules>
<DataErrorValidationRule/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
It uses this ToolTip:
<ToolTip x:Key="ErrorToolTip" Style="{StaticResource ErrorToolTipStyle}"/>
And the ToolTip uses this style, which gets its content from the ValidationError property of the TextBox's binding source:
<Style x:Key="ErrorToolTipStyle" TargetType="{x:Type ToolTip}">
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="HasDropShadow" Value="True"/>
<Setter Property="DataContext" Value="{Binding Path=PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToolTip">
<Border
Name="Border"
BorderThickness="1"
BorderBrush="LightGray">
<StackPanel Orientation="Vertical">
<Label Background="Firebrick" Foreground="White" FontWeight="Bold" Margin="4">Validation error</Label>
<TextBlock Margin="10" Text="{Binding ValidationError}"/>
</StackPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="HasDropShadow" Value="true">
<Setter TargetName="Border" Property="CornerRadius" Value="4"/>
<Setter TargetName="Border" Property="SnapsToDevicePixels" Value="true"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I'm not certain of this, but I think that the only part of the above that actually has to be set in the style is the DataTrigger setting the DataContext; I think most everything else could just be explicitly set in the ToolTip's visual tree. But I'm probably not thinking of something important.
<Label Content={Binding Path=Id} ToolTip={Binding Path=Name}/>
just try this
Here's a kaxaml-ready example that includes a tooltip that is a little more elaborate than just text:
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Page.Resources>
<XmlDataProvider x:Key="CharacterData">
<x:XData>
<Data xmlns="">
<Character First="Bart" Last="Simpson" Background="LightGreen" />
<Character First="Homer" Last="Simpson" Background="LightBlue" />
<Character First="Lisa" Last="Simpson" Background="Pink" />
<Character First="Maggie" Last="Simpson" Background="Yellow" />
<Character First="Marge" Last="Simpson" Background="PapayaWhip" />
</Data>
</x:XData>
</XmlDataProvider>
<ToolTip x:Key="ElaborateToolTip">
<Grid Margin="5">
<Rectangle RadiusX="6" RadiusY="6" Fill="{Binding XPath=#Background}" />
<StackPanel Orientation="Horizontal" Margin="10">
<TextBlock Text="{Binding XPath=#First}" Margin="0,0,6,0" />
<TextBlock Text="{Binding XPath=#Last}" />
</StackPanel>
</Grid>
</ToolTip>
</Page.Resources>
<ListBox ItemsSource="{Binding Source={StaticResource CharacterData}, XPath=Data/Character}">
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="ToolTip" Value="{StaticResource ElaborateToolTip}" />
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding XPath=#First}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Page>