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Launch MouseEnter event Image from XAML dictionnary with MVVM

I have a template for a DataGrid located in a ResourceDictionary.
BlockStyles.xaml
<Style TargetType="DataGrid" x:Key="SearchExpGrid">
<Setter Property="AlternatingRowBackground" Value="#4C87C6ff"/>
<Setter Property="GridLinesVisibility" Value="None"/>
<Setter Property="FontSize" Value="15"/>
<Setter Property="HeadersVisibility" Value="Column"/>
<Setter Property="CellStyle">
<Setter.Value ... />
</Setter>
<Setter Property="RowStyle">
<Setter.Value ... />
</Setter>
<Setter Property="ColumnHeaderStyle">
<Setter.Value>
<Style TargetType="DataGridColumnHeader">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border
x:Name="Border" Background="White" BorderBrush="#4C87C6" BorderThickness="1" >
<StackPanel Orientation="Horizontal" Margin="5,5" HorizontalAlignment="Center">
<TextBlock
x:Name="TxtB" Text="{Binding}"
Foreground="#4C87C6" FontWeight="DemiBold" HorizontalAlignment="Center"/>
<Image Source="../Images/dropdown.png"
Width="10" Height="10" Margin="5,0,5,0"
MouseEnter="DropdownButton_MouseEnter"
MouseLeave="DropdownButton_MouseLeave"
MouseEnter="DropdownButton_Click"/>
</StackPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="Border" Property="Background" Value="#4C87C6"/>
<Setter TargetName="TxtB" Property="Foreground" Value="White"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
</Style>
I always have an error because the function can't find it's definition.
I first implemented the function in the View file where the style is used but it doesn't work.
I tried this method from StackOverflow using a resource class inheriting ResourceDictionnary but got the same error.
I then tried to use ICommand and RelayCommand to execute the function from the ViewModel but didn't got any result.
I also didn't find where I could add an EventHandler ImgDropdownButton.MouseEnter += new MouseEventHandler(MouseEnter_DropdownButton); using MVVM.
Is there a better solution for this kind of behaviour or if adding an EventHandler is the best solution, where sould be the best place to add it ?
Thanks in advance
Edit :
I managed to handle the function using a code-behind file for my ResourceDictionary following this.
BlockStyles.xaml.cs
private void DropdownButton_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
{
Mouse.OverrideCursor = Cursors.Hand;
}
private void DropdownButton_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
{
Mouse.OverrideCursor = Cursors.Arrow;
}
private void DropdownButton_Click(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
//Function to show the popup
}
The MouseEnter and MouseLeave function are working, but I don't understand how to use the function to make my popup appear.
What I'm trying to do is that when I click on the Dropdown Image on the column header, I want to display a Popup, like an Excel one. This will allow the user to filter the columns values.
The file where my Grid and Popup are : (SearchExpView.xaml)
<Grid Grid.Row="2" Grid.Column="1">
<searchcomponents:ExpListView x:Name="ExpDatagrid"
DataContext="{Binding OExpListVM}"
Width="auto" Height="auto"/>
</Grid>
<Popup x:Name="PopupFiltre">
PopupFiltre content
</Popup>
Definition of my Datagrid : (ExpListView.xaml)
<Grid>
<DataGrid x:Name="ExpGrid" Style="{StaticResource SearchExpGrid}"
BorderThickness="0" BorderBrush="#4C87C6"
HorizontalAlignment="Left" VerticalAlignment="Top"
MinHeight="200" Height="auto" Margin="10,10,0,0"
MinWidth="780" Width="auto"
ItemsSource="{Binding}" DataContext="{Binding tableExpertise.DefaultView}"
AutoGenerateColumns="True" CanUserAddRows="False" IsReadOnly="True">
<DataGrid.InputBindings>
<MouseBinding MouseAction="LeftDoubleClick"
Command="{Binding DataContext.OnRowDoubleClickedCommand, RelativeSource={RelativeSource AncestorType=UserControl}}"
CommandParameter="{Binding ElementName=ExpGrid, Path=CurrentItem}"/>
</DataGrid.InputBindings>
<DataGrid.ContextMenu>
<ContextMenu Name="dgctxmenu">
<Separator></Separator>
</ContextMenu>
</DataGrid.ContextMenu>
</DataGrid>
</Grid>
I'm looking for a way to be able to implement this popup fonction but I can't find out how to link everything together.

My Window is SearchExpView.xaml (with the Datagrid and the Popup). My Datagrid component is defined in ExpListView.xaml and styled in BlockStyles.xaml, which is not a window. I want to make the Popup (in SearchExpView.xaml) visible by clicking on the dropdown button (defined in BlockStyles.xaml)
Then you need to get a reference to the Popup in the window from the ResourceDictionary somehow.
You could for example use the static Application.Current.Windows property:
var window = Application.Current.Windows.OfType<SearchExpView>().FirstOrDefault();
if (window != null)
window.PopupFiltre.IsOpen = true;
Also make sure that you make the Popup accessible from outside the SearchExpView class:
<Popup x:Name="PopupFiltre" x:FieldModifier="internal">
...

Closable tab with tab item being a user control

I am working on a project in C# WPF. I have a tab container and I want to dynamically load different types of tabs into the tab container as the user requires. As an example I am doing something like the following:
tabContainer.Items.Add(new MyUserControl());
I want each tab to have a close button so the tab can be removed the container when the user no longer requires it.
I found this code project example but from what I can see you are a loading a user control which contains the xaml for the tab itself, not the tab content or am I missing something.
How can I load in my User Control into the tab container, but also have the tab closable.
Currently the tab that I am loading in uses some static binding to set the tab title using the following:
<TabControl x:Name="tabContainer" Grid.Column="2" Margin="10,45,0,0" RenderTransformOrigin="0.5,0.55" Grid.ColumnSpan="3">
<TabControl.Resources>
<Style TargetType="{x:Type TabItem}">
<Setter Property="Header" Value="{Binding TabHeader}" />
</Style>
</TabControl.Resources>
</TabControl>
My user control then has a `public string TabHeader{get;set;} which gets set in the constructor depending on what constructor of my user control is used.

You will have to define the close Button yourself. You could for example do this in the HeaderTemplate of the TabItem:
<TabControl x:Name="tabContainer">
<TabControl.Resources>
<Style TargetType="{x:Type TabItem}">
<Setter Property="Header" Value="{Binding TabHeader}" />
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding}" />
<Button Content="x" Click="Button_Click_2"
Tag="{Binding DataContext, RelativeSource={RelativeSource AncestorType=TabItem}}"/>
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.Resources>
</TabControl>
The Tag property is bound to the UserControl in the Items collection which you can remove in the click event handler of the Button, like this:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
tabContainer.Items.Add(new MyUserControl());
}
private void Button_Click_2(object sender, RoutedEventArgs e)
{
Button button = sender as Button;
tabContainer.Items.Remove(button.Tag);
}
}

If you want to add a close button to each tab, that would be in the TabItem style ControlTemplate. Normally you'd specify the data context (i.e. the data only that's driving the content) in Content and then specify the look in ContentTemplate. If your Content is a UserControl then you don't specify the ContentTemplate since a UserControl knows how to draw itself.

For my sins, I've added close-tab buttons to the WPF TabControl. I ended up putting the close button in the ItemTemplate. Here's a minimal version that works with the way you're populating the TabControl and the header content:
<TabControl
>
<TabControl.Resources>
<Style TargetType="{x:Type TabItem}">
<Setter Property="Header" Value="{Binding TabHeader}" />
</Style>
</TabControl.Resources>
<TabControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Label
Content="{Binding}"
Grid.Column="0"
/>
<Button
VerticalAlignment="Center"
Grid.Column="1">
<Path
Data="M 0, 0 L 12, 12 M 12,0 L 0,12"
Stroke="Red"
StrokeThickness="2"
Width="12"
Height="12"
/>
</Button>
</Grid>
</DataTemplate>
</TabControl.ItemTemplate>
<local:UserControl1 TabHeader="First Item" />
<local:UserControl1 TabHeader="Second Item" />
</TabControl>

WPF ListBoxItem ControlTemplate breaks some MouseDown/Selection

I have an issue with ListBoxItems. I am trying to make all controls in the ListBoxItem select it as well, so clicking on a TextBox, Label, etc will select the ListBoxItem. Pretty simple so far.
I am also changing the ListBoxItem Template to change the selection visualization from highlighting the background to just drawing a border. Also pretty simple.
The combination of these two, however, seems to cause some really irritating issues with MouseDown and PreviewMouseDown, specifically in my case regarding Labels in a Grid, where one creates a "void" occupied by Grid space.
Using snoop, I can see the PreviewMouseDown event stopping at the ScrollViewer inside the ListBox, and not going all the way to the ListBoxItem.
XAML:
<Window x:Class="ListBoxClickThroughTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
Width="525"
Height="350">
<Grid>
<ListBox ItemsSource="{Binding Items}"
SelectionMode="Single">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Label Name="VerySuperLongLabel"
Grid.Row="0"
Grid.Column="0"
HorizontalAlignment="Left"
Content="VerySuperLongLabel"
Padding="0" />
<TextBox Name="Textbox1"
Grid.Row="0"
Grid.Column="1"
HorizontalAlignment="Stretch"
HorizontalContentAlignment="Right"
Text="Textbox1 Text" />
<Label Name="ShortLabel"
Grid.Row="1"
Grid.Column="0"
HorizontalAlignment="Left"
Content="ShortLabel"
Padding="0" />
<TextBox Name="Textbox2"
Grid.Row="1"
Grid.Column="1"
HorizontalAlignment="Stretch"
HorizontalContentAlignment="Right"
Text="Textbox2 Text" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<EventSetter Event="PreviewMouseDown"
Handler="ListBoxItem_PreviewMouseDown" />
<EventSetter Event="MouseDown"
Handler="ListBoxItem_PreviewMouseDown" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="Bd"
BorderThickness="1">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="Bd" Property="BorderBrush" Value="Gray" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
</Grid>
</Window>
Code-behind:
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace ListBoxClickThroughTest
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
Items = new List<string>() { "1", "2" };
InitializeComponent();
DataContext = this;
}
public List<string> Items { get; set; }
private void ListBoxItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
var listBoxItem = (ListBoxItem)sender;
listBoxItem.IsSelected = true;
}
}
}
However, if I remove the Template setter, all is well. Is there some magic in the template I'm missing? I tried renaming the border to "Bd" as that was what the default template border was named, but no luck. Any ideas?

If you change the horizontal alignment of the labels from "Left" to "Stretch" this will fix the problem and keep the visual formatting the same.
Mousedown events only work in areas where elements exist. By having the labels at a "left" horizontal alignment, you are creating the "void" you mentioned, where no element exists at that level that can be clicked. To visually see the difference, try temporarily setting the background property of the label elements that are giving you problems, and you'll see the element doesn't extend all the way to the textbox.

WPF - MenuItem missing Icon/Image

Im getting menuItem icon appearing only on last menuItem.
If i snoop the app only last menuItem has image in icon, while if i debug all MenuItems appear to have image in icon. Also if i add submenuItem the icon on menuItem dissapears once i open submenus and the last submenu gets the icon... Any idea? PS: also tooltips on menu item dont work.
Im using caliburn micro and fluent ribbon controls.
<ControlTemplate x:Key="dropDownButton">
<ef:DropDownButton Header="{Binding DisplayName}"
ItemsSource="{Binding Items}"
LargeIcon="{Binding LargeIconPath}"
cm:Message.Attach="ClickAction()"
ef:KeyTip.Keys="{Binding KeyTip}">
<ef:DropDownButton.ItemContainerStyle>
<Style TargetType="MenuItem">
<Setter Property="Header"
Value="{Binding DisplayName}"/>
<Setter Property="Icon">
<Setter.Value>
<Image Source="{Binding Path=IconPath}"/>
</Setter.Value>
</Setter>
<Setter Property="ItemsSource"
Value="{Binding Items}"/>
<Setter Property="cm:Message.Attach"
Value="ClickAction()"/>
<Setter Property="ef:KeyTip.Keys"
Value="{Binding KeyTip}"/>
<Setter Property="ToolTip">
<Setter.Value>
<ef:ScreenTip Title="{Binding DisplayName}"
HelpTopic="ScreenTip help ..."
Image="{Binding LargeIconPath}"
Text="Text for ScreenTip"/>
</Setter.Value>
</Setter>
</Style>
</ef:DropDownButton.ItemContainerStyle>
<ef:DropDownButton.ToolTip>
<ef:ScreenTip Title="{Binding DisplayName}"
HelpTopic="ScreenTip help ..."
Image="{Binding LargeIconPath}"
Text="Text for ScreenTip"/>
</ef:DropDownButton.ToolTip>
</ef:DropDownButton>

You are setting Icon property to an Image control in Style. Now, only one copy of Style is created and thus, only one copy of Image is created. Now, any control can have only one parent at a time. So, when it is assigned to last MenuItem, it is removed from previous MenuItem controls. To fix this, use Templates.
Instead of setting Header property, set HeaderTemplate:
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Image Grid.Column="0"
Source="{Binding Path=IconPath}" />
<TextBlock Grid.Column="1"
Text="{Binding DisplayName}" />
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
I'm not sure of what properties are exposed by the control toolkit you are using. But, I'm sure they must have a template property.
After doing this, you don't need to set Icon property in style.

I successfully use the following entries in a ResourceDictionary:
<!-- Define non-shared image to avoid loss of menu icons -->
<Image x:Key="MenuIconImage" Height="16" Width="16" x:Shared="false">
<Image.Source>
<DrawingImage Drawing="{Binding Icon}" />
</Image.Source>
</Image>
<Style TargetType="{x:Type MenuItem}" BasedOn="{StaticResource {x:Type MenuItem}}">
<Setter Property="Header" Value="{Binding DisplayName />
<Setter Property="Icon" Value="{StaticResource MenuIconImage}" />
</Style>

Works like this:
<DataTemplate x:Key="MenuItemHeaderTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Image Grid.Column="0" Source="{Binding Path=IconPath}" />
<Label Grid.Column="1" Content="{Binding DisplayName}" />
</Grid>
</DataTemplate>
<ControlTemplate x:Key="dropDownButton">
<ef:DropDownButton Header="{Binding DisplayName}"
ItemsSource="{Binding Items}"
LargeIcon="{Binding LargeIconPath}"
cm:Message.Attach="ClickAction()"
ef:KeyTip.Keys="{Binding KeyTip}">
<ef:DropDownButton.ItemContainerStyle>
<Style TargetType="MenuItem">
<Setter Property="HeaderTemplate" Value="{StaticResource MenuItemHeaderTemplate}" />
<Setter Property="ItemsSource"
Value="{Binding Items}"/>
<Setter Property="cm:Message.Attach"
Value="ClickAction()"/>
<Setter Property="ef:KeyTip.Keys"
Value="{Binding KeyTip}"/>
<Setter Property="ToolTip">
<Setter.Value>
<ef:ScreenTip Title="{Binding DisplayName}"
HelpTopic="ScreenTip help ..."
Image="{Binding LargeIconPath}"
Text="Text for ScreenTip"/>
</Setter.Value>
</Setter>
</Style>
</ef:DropDownButton.ItemContainerStyle>
<ef:DropDownButton.ToolTip>
<ef:ScreenTip Title="{Binding DisplayName}"
HelpTopic="ScreenTip help ..."
Image="{Binding LargeIconPath}"
Text="Text for ScreenTip"/>
</ef:DropDownButton.ToolTip>
</ef:DropDownButton>

For some reason approach when Image is static resource with x:Shared = false doesn't work for me. Only last menu item shows icon. I've tried both StaticResource and DynamicResource. Here is my solution:
public class MenuItemIconHelper
{
#region ImageSource Icon
public static readonly DependencyProperty IconProperty = DependencyProperty.RegisterAttached("Icon", typeof(ImageSource), typeof(MenuItemIconHelper), new PropertyMetadata(default(ImageSource), IconPropertyChangedCallback));
private static void IconPropertyChangedCallback(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
var i = (MenuItem)obj;
if (e.NewValue != null)
i.Icon = new Image() {Source = (ImageSource)e.NewValue};
else
i.Icon = null;
}
public static void SetIcon(DependencyObject element, ImageSource value)
{
element.SetValue(IconProperty, value);
}
public static ImageSource GetIcon(DependencyObject element)
{
return (ImageSource)element.GetValue(IconProperty);
}
#endregion
}
Sample:
<Style x:Key="CommandMenuItemStyle" TargetType="MenuItem">
<Setter Property="cb:MenuItemIconHelper.Icon" Value="car1.png" />
<Setter Property="Header" Value="{Binding Name}" />
I consider it to be more readable than using resource and you don't need to change MenuItem's HeaderTemplate. You can also implement some caching mechanism for ImageSource or Image.

1. Add Existing File... image file to resources (if you already have one, skip it).
2. In Solution Explorer select this image file.
3. Change Build Action to Resource.
And finally, you can add this image to XAML with simple call:
<Window.Resources>
<ContextMenu x:Key="contextMenu" >
<MenuItem Header="Restart" Name="menuItemRestart" Click="MenuItem_Click">
<MenuItem.Icon>
<Image Source="/Resources/restart.png"/>
</MenuItem.Icon>
</MenuItem>
<Separator/>
<MenuItem Header="Exit" Name="menuItemExit" Click="MenuItem_Click">
<MenuItem.Icon>
<Image Source="/Resources/window_close.png"/>
</MenuItem.Icon>
</MenuItem>
</ContextMenu>
</Window.Resources>
The Result:

WPF Change Grid.ColumnSpan on trigger [duplicate]

This question already has answers here:
How to get DataTemplate.DataTrigger to check for greater than or less than?
(4 answers)
Closed 2 years ago.
tl;dr: I want detail views to appear in 2 columns if 2 items are selected, and to span 2 columns if only 1 item is selected.
I have a DockPanel with 2 ListBoxes docked on the left and a 2-column Grid on the right.
When an item is selected in listBox1, I display a details view in Column 0 of the Grid.
When an item is selected in listBox2, I display a details view in Column 1 of the Grid.
<DockPanel>
<StackPanel DockPanel.Dock="Left" Orientation="Horizontal">
<ListBox x:Name="listBox1" ItemsSource="{Binding Items1}" SelectedItem="{Binding SelectedItem1}"/>
<ListBox x:Name="listBox2" ItemsSource="{Binding Items2}" SelectedItem="{Binding SelectedItem2}"/>
</StackPanel>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<ContentControl Grid.Column="0" Content="{Binding SelectedItem1}" ContentTemplateSelector="{StaticResource SelectedItemTemplateSelector}"/>
<ContentControl Grid.Column="1" Content="{Binding SelectedItem2}" ContentTemplateSelector="{StaticResource SelectedItemTemplateSelector}"/>
</Grid>
</DockPanel>
This works fine. However, I'd like to modify it so that the details view will span both grid columns when there is an item selected in one of the ListBoxes but not in the other.
My first thought was to create a couple of DataTriggers that modify the ColumnSpan of the ContentControls based on the SelectedIndex of the ListBoxes.
This works fine for the details view that normally lives in Grid.Column="0". However, it doesn't work for the details view that normally lives in Grid.Column="1" since the original column number is hard-coded:
<ContentControl Grid.Column="0" Content="{Binding SelectedItem1}" ContentTemplateSelector="{StaticResource SelectedItemTemplateSelector}">
<ContentControl.Style>
<Style TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=listBox2, Path=SelectedIndex}" Value="-1">
<Setter Property="Grid.ColumnSpan" Value="2"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
<ContentControl Grid.Column="1" Content="{Binding SelectedItem2}" ContentTemplateSelector="{StaticResource SelectedItemTemplateSelector}">
<ContentControl.Style>
<Style TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=listBox1, Path=SelectedIndex}" Value="-1">
<!--Can't modify Grid.Column since it's hardcoded above!-->
<Setter Property="Grid.Column" Value="0"/>
<Setter Property="Grid.ColumnSpan" Value="2"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
If I could create a DataTrigger that could do a value comparison against ListBox.SelectedIndex (ie. >=0), then I could avoid hard-coding the column numbers in the first place.
Is there any way to do something like this in XAML?

You can always do the hidden element binding trick. the example below, you just change bindme to 2, and the Grids span will change. I do this on all types of stuff you can't animate with a storyboard.
<Rectangle x:Name="bindme" Width="0" Height="0" Tag="1" />
<Grid Grid.ColumnSpan="{Binding Tag, ElementName=bindme}">