I have two Windows for an application. One of them is MainWindow and the other is for settings. SettingsWindow opens when settings button is clicked by using ShowDialog and setting its Owner to MainWindow.
On the SettingsWindow I have a button at the very bottom of the window and it changes the color to red when IsMouseOver is True and blue for False. But it doesn't change when the cursor is over the MainWindow. The image is below to be clear. How can I fix this problem?
CASE: The cursor is out of SettingsWindow but it keeps the red color, no change.
Xaml code:
<Window x:Class="AltoSS.SettingsWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="SettingsWindow"
Height="150"
Width="360"
WindowStyle="None"
AllowsTransparency="True"
WindowStartupLocation="CenterOwner">
<!-- Other control codes-->
<Button Grid.Row="2" Content="KAYDET"
FontSize="15"
FontWeight="Bold"
BorderBrush="Gray"
BorderThickness="0,2,0,2">
<Button.Style>
<Style TargetType="Button">
<Setter Property="Background" Value="Blue"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Red"/>
<Setter Property="Foreground" Value="White"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
</Button>
</Window>
Alright, after doing some research, I couldn't find any logical reason for this to occur. It seems more like a bug to me. So if anyone knows exactly why this happens, let us know!
Anyway, I've come up with a workaround. Basically, we can use Show() and add some code to get closer to a modal behavior - like disabling the parent window until the dialog gets closed or the user has selected OK or Cancel for instance.
Example:
SettingsWindow settingsWindow = new SettingsWindow();
this.IsEnabled = false; //disables the main window
settingsWindow.Owner = this; // main window is the settings window owner
settingsWindow.Show();
settingsWindow.Closed += (o, e1) => { onWindowClosed(o,e1); }; // this is the close event
After subscribing for the settingsWindow closed event, we can now enable the parent window again when settingsWindow gets closed:
private void onWindowClosed(object sender, EventArgs e)
{
this.IsEnabled = true;
}
Triggers will now work correctly and parent window gets disabled until its child is closed.
I think you have to observe the mouse position manually. For this you could use the code behind posted by Peheje here.
I used this to program a working example. While leaving your window, the Button gets the correct style.
using System.Runtime.InteropServices;
using Point = System.Drawing.Point;
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetCursorPos(ref Point lpPoint);
public bool IsMouseOverButton {
get { return _isMouseOverButton; }
set {
if (value == _isMouseOverButton) return;
_isMouseOverButton = value;
OnPropertyChanged();
}
}
public SettingsWindow()
{
InitializeComponent();
new Thread(() =>
{
while (true)
{
//Logic
Point p = new Point();
GetCursorPos(ref p);
//Update UI
Application.Current.Dispatcher.Invoke(() =>
{
double btnLeft = DlgWindow.Left;
double btnRight = btnLeft + DlgBtn.ActualWidth;
double btnBottom = DlgWindow.Top + DlgWindow.ActualHeight;
double btnTop = btnBottom - DlgBtn.ActualHeight;
IsMouseOverButton =
p.X >= btnLeft && p.X <= btnRight &&
p.Y >= btnTop && p.Y <= btnBottom;
});
//async wait (non blocking)
(new ManualResetEvent(false)).WaitOne(100);
}
}).Start();
}
xaml
<Window x:Name="DlgWindow"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
AllowsTransparency="True">
<Button x:Name="DlgBtn"
Height="50"
VerticalAlignment="Bottom"
BorderBrush="Gray"
BorderThickness="0,2,0,2"
Content="KAYDET"
FontSize="15"
FontWeight="Bold">
<Button.Style>
<Style TargetType="Button">
<Setter Property="Background" Value="Blue"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding IsMouseOverButton}" Value="True">
<Setter Property="Background" Value="Red" />
<Setter Property="Foreground" Value="White" />
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
</Button>
This works for me: Define a style resource (for the button) under settings Window.Resources - This style then sets the new Template (a border), the default background as blue, and the IsMouseOver trigger to change it to red. Reference the style either explicitly for implicitly (both worked for me).
Link to small test project: https://1drv.ms/u/s!AhlMAmchX3R6nDJ1MXS6DxlRXtnA
<Window x:Class="IsMouseOverTriggerSecondWindow.SettingsWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:IsMouseOverTriggerSecondWindow"
mc:Ignorable="d"
Title="SettingsWindow" Height="170" Width="330">
<!-- my settings window button style-->
<!-- defined as a resource in SettingsWindow.xaml, so it doesnt effect MainWindow -->
<Window.Resources>
<Style TargetType="Button" >
<Setter Property="Background" Value="Blue"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Background="{TemplateBinding Background}">
<ContentPresenter Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<TextBlock Text="This is the settings window" />
<Button Content="KAYDET" Height="30" VerticalAlignment="Bottom" Foreground="White" FontWeight="Bold" />
</Grid>
</Window>
In the application on which I'm working I have couple of items which I monitor. Every item has several states (on, off, change).
States are saved in model and DataContext of window is set to it.
Every button DataContext is set to single item in SortableBindingList.
In the XAML I have created Control Template for button and in DataTrigerrs in it.
However, sometimes item only shows for first button, sometimes only for first three buttons (depending on what content I put inside DataTrigger).
When I check in Snoop I see that all three buttons have correct DataContext set and there are no binding errors.
I expect that every button shows it's content depending on value of 'serverstate' property however this does not happen.
What am I doing wrong?
Control Template goes to Window.Resources:
<ControlTemplate x:Key="buttonTemplate" TargetType="Button" >
<Border BorderThickness="1"
BorderBrush="Gray"
Margin="2"
Width="40" Height="35"
>
<Border.Background>
<SolidColorBrush Color="Brown" />
</Border.Background>
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding serverstate}" Value="0">
<Setter Property="Content">
<Setter.Value>
<TextBlock Name="a1" Text="OFF" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="White" />
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding serverstate}" Value="1">
<Setter Property="Content">
<Setter.Value>
<TextBlock Name="a2" Text="CHNG" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="White" />
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding serverstate}" Value="2">
<Setter Property="Content">
<Setter.Value>
<TextBlock Name="a3" Text="ON" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="White" />
</Setter.Value>
</Setter>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
Buttons:
<Button Name="state1"
DataContext="{Binding ActiveServers[0]}"
Template="{StaticResource buttonTemplate}"
/>
<Button Name="state2"
DataContext="{Binding ActiveServers[1]}"
Template="{StaticResource buttonTemplate}"
/>
<Button Name="state3"
DataContext="{Binding ActiveServers[2]}"
Template="{StaticResource buttonTemplate}"
/>
<Button Name="state4"
DataContext="{Binding ActiveServers[3]}"
Template="{StaticResource buttonTemplate}"
/>
<Button Name="state5"
DataContext="{Binding ActiveServers[4]}"
Template="{StaticResource buttonTemplate}"
/>
This is how buttons shows up in window:
Notice how button 4 and 5 completely ignore property value in datacontext.
Model:
public class Model : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public Model()
{
}
private SortableBindingList<Server> _activeServers;
public SortableBindingList<Server> ActiveServers
{
get {
if (_activeServers == null)
{
_activeServers = new SortableBindingList<Server>();
}
return _activeServers;
}
set
{
_activeServers = value;
OnPropertyChanged("serverList");
}
}
// Create the OnPropertyChanged method to raise the event
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
I think the problem is, that two buttons cann't use same Content. So each type of Content appears one time for each trigger value. You can avoid this by using ContentTemplate.
So the code should look like this (same for other DataTriggers). It allows you to change DataTemplates to more complicated later.
<DataTrigger Binding="{Binding serverstate}" Value="2">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<TextBlock Text="ON" VerticalAlignment="Center"
HorizontalAlignment="Center" Foreground="White" />
</DataTemplate>
</Setter.Value>
</Setter>
</DataTrigger>
Try to change Content property, but not creating new TextBlock:
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding serverstate}" Value="0">
<Setter Property="Content" Value="OFF"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding serverstate}" Value="1">
<Setter Property="Content" Value="CHNG"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding serverstate}" Value="2">
<Setter Property="Content" Value="ON"></Setter>
</DataTrigger>
</ControlTemplate.Triggers>
I have a Button Style with a Template containing a ContentPresenter, in which I am attempting to bind the Fill of a Path to the Foreground of a button:
<!-- This is inside the template of a button style -->
<ContentPresenter>
<ContentPresenter.Resources>
<Style TargetType="{x:Type Path}">
<Setter Property="Fill" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType=Button}}"/>
</Style>
</ContentPresenter.Resources>
</ContentPresenter>
I also have a Path with no Fill set, that I can reference in the button as the content, like so:
<Button Style="{DynamicResource MyButtonStyle}" Content="{DynamicResource PathIcon}" Foreground="Blue"/>
I would expect the Path inside the button to be blue, but it isn't... it doesn't grab the foreground from the button.
How can I get the Path to bind to the color of the button?
Thank you!
P.S.:
If I put a hardcoded color in the Value (i.e. Value="Red"), the Path inside the button is red... so I know that works...
<ContentPresenter>
<ContentPresenter.Resources>
<Style TargetType="{x:Type Path}">
<Setter Property="Fill" Value="Red"/>
</Style>
</ContentPresenter.Resources>
</ContentPresenter>
Edit:
Here is the complete Style and ControlTemplate:
<Style x:Key="Button_Style" TargetType="{x:Type Button}">
<Setter Property="Foreground" Value="{StaticResource White_Brush}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid x:Name="grid" Background="Transparent">
<ContentPresenter>
<ContentPresenter.Resources>
<Style TargetType="{x:Type Path}">
<Setter Property="Fill" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType=Button}}"/>
</Style>
</ContentPresenter.Resources>
</ContentPresenter>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<!-- Should affect Text as well as Paths in the Content property of the button! -->
<Setter Property="Foreground" Value="{StaticResource Black_Brush}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Okay, let's order:
it doesn't grab the foreground from the button.
In styles this construction:
RelativeSource={RelativeSource AncestorType=Button}
will not work, because the Style is just the collection of setters, he does not know about control, are there, specifically about the content of the visual tree. Because RelativeSource should refer to the items above in the visual tree. For this purpose, usually using DataTemplate or ControlTemplate.
If I put a hardcoded color in the Value (i.e. Value="Red")
Yes, in this case, will be working, and always better to create the design of the form:
<SolidColorBrush x:Key="MyButtonColor" Color="Blue" />
And use it for control, like Button:
<Button Background="{StaticResource MyButtonColor}" ... />
and in Style or elsewhere:
<Setter Property="Fill" Value="{StaticResource MyButtonColor}" />
That is, it is better not to depend on the element parameters (background color, etc.) located in a visual tree, because it can:
May move to another panel (Grid, StackPanel) or UserControl
May leave from the project
And brushes in the as resources will always be in one place, changing them in this place, all the elements of their pick up. Also colors can be stored in a special data model that does not depend on the specific technical implementations (resources, variables) in which the data can come from an external source, such as the project/config settings.
If possible, it is better to avoid the use of dynamic resources due to unnecessary use of system perfomance (and in some cases memory leaks), in your cases they are not needed.
Dynamic resources are usually explicitly defined for SolidColorBrush and another species brushes, because by default they are frozen, and they not recommended changed because of the above mentioned reasons (memory leaks). More information can be found here:
Freezable Objects Overview on MSDN
Edit
As I understand it, you want to make universal Style for Button to make the contents of Path or Text (in the case of simultaneous use will be easier). As I have already mentioned above, RelativeSource should be around ControlTemplate, therefore, the Path will be in the Grid with the ContentPresenter.
To style knew, which is provided for the text or for the path, to the Tag (optional property) indicates two properties: OnlyText or OnlyPath.
To set the data for the Path, I've created a attached dependency property, and prescribed it in the ControlTemplate.
Below is a complete example:
XAML
<Window x:Class="ButtonPathHelp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ButtonPathHelp"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
WindowStartupLocation="CenterScreen"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<SolidColorBrush x:Key="Green_Brush" Color="Green" />
<SolidColorBrush x:Key="Black_Brush" Color="Black" />
<Style x:Key="Button_Style" TargetType="{x:Type Button}">
<Setter Property="Foreground" Value="{StaticResource Green_Brush}" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid x:Name="grid">
<ContentPresenter x:Name="MyContent"
Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
VerticalAlignment="{TemplateBinding VerticalAlignment}" />
<Path x:Name="MyPath"
SnapsToDevicePixels="True"
Width="20"
Height="18"
Stretch="Fill"
Fill="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type Button}}}"
Data="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(local:MyDependencyClass.DataForPath)}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Foreground" Value="{StaticResource Black_Brush}"/>
</Trigger>
<Trigger Property="Tag" Value="OnlyText">
<Setter TargetName="MyPath" Property="Visibility" Value="Collapsed" />
<Setter TargetName="MyContent" Property="Visibility" Value="Visible" />
</Trigger>
<Trigger Property="Tag" Value="OnlyPath">
<Setter TargetName="MyPath" Property="Visibility" Value="Visible" />
<Setter TargetName="MyContent" Property="Visibility" Value="Collapsed" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<WrapPanel>
<WrapPanel.Resources>
<sys:String x:Key="Save">
F1 M 20.5833,20.5833L 55.4167,20.5833L 55.4167,55.4167L 45.9167,55.4167L 45.9167,44.3333L 30.0833,44.3333L 30.0833,
55.4167L 20.5833,55.4167L 20.5833,20.5833 Z M 33.25,55.4167L 33.25,50.6667L 39.5833,50.6667L 39.5833,55.4167L 33.25,
55.4167 Z M 26.9167,23.75L 26.9167,33.25L 49.0833,33.25L 49.0833,23.75L 26.9167,23.75 Z
</sys:String>
<sys:String x:Key="Search">
F1 M 23.4454,49.2637L 31.7739,41.1598C 30.6986,39.2983 30.4792,37.1377 30.4792,34.8333C 30.4792,27.8377 35.7544,
22.1667 42.75,22.1667C 49.7456,22.1667 55.4167,27.8377 55.4167,34.8333C 55.4167,41.8289 49.7456,47.1042 42.75,
47.1042C 40.5639,47.1042 38.5072,46.9462 36.7125,45.9713L 28.3196,54.1379C 27.0829,55.3746 24.6821,55.3746 23.4454,
54.1379C 22.2088,52.9013 22.2088,50.5004 23.4454,49.2637 Z M 42.75,26.9167C 38.3777,26.9167 34.8333,30.4611 34.8333,
34.8333C 34.8333,39.2056 38.3777,42.75 42.75,42.75C 47.1222,42.75 50.6667,39.2056 50.6667,34.8333C 50.6667,
30.4611 47.1222,26.9167 42.75,26.9167 Z
</sys:String>
</WrapPanel.Resources>
<Button Name="SaveButton"
Style="{StaticResource Button_Style}"
Tag="OnlyPath"
local:MyDependencyClass.DataForPath="{StaticResource Save}"
Margin="10" />
<Button Name="JustText"
Style="{StaticResource Button_Style}"
Tag="OnlyText"
Content="Just Text"
Margin="10" />
<Button Name="SearchButton"
Style="{StaticResource Button_Style}"
Tag="OnlyPath"
local:MyDependencyClass.DataForPath="{StaticResource Search}"
Margin="10" />
</WrapPanel>
</Window>
Code behind
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
}
public class MyDependencyClass : DependencyObject
{
#region IsCheckedOnDataProperty
public static readonly DependencyProperty DataForPathProperty;
public static void SetDataForPath(DependencyObject DepObject, string value)
{
DepObject.SetValue(DataForPathProperty, value);
}
public static string GetDataForPath(DependencyObject DepObject)
{
return (string)DepObject.GetValue(DataForPathProperty);
}
#endregion
static MyDependencyClass()
{
PropertyMetadata MyPropertyMetadata = new PropertyMetadata(String.Empty);
DataForPathProperty = DependencyProperty.RegisterAttached("DataForPath",
typeof(string),
typeof(MyDependencyClass),
MyPropertyMetadata);
}
}
Note: In the Style I have not used TemplateBinding for attached property, because TemplateBinding doesn’t work outside a template or outside its VisualTree property, so you can’t even use TemplateBinding inside a template’s trigger. Therefore, we must use the construction {RelativeSource TemplatedParent} and a Path equal to the dependency property whose value you want to retrieve.
Output
To download the entire example please follow this link.
I stumbled across simillar problem but was wondering how to get to the 'Foreground Colour' of the Button in its DISABLED state (to have correct colour of my drawing). Here is a finally simple sollution. No templates, No styles, no code, nothing at all. Just the right relative binding :-) :
<StackPanel Orientation="Horizontal">
<Button Height="22" IsEnabled="False">
<Polygon Points="4,0 4,5 5,5 2.5,10 0,5 1,5 1,0 "
Fill="{Binding (TextElement.Foreground), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}}">
<Polygon.LayoutTransform>
<RotateTransform Angle="90"></RotateTransform>
</Polygon.LayoutTransform>
</Polygon>
</Button>
<Button Height="22" IsEnabled="True">
<Polygon Points="4,0 4,5 5,5 2.5,10 0,5 1,5 1,0 "
Fill="{Binding (TextElement.Foreground), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}}">
<Polygon.LayoutTransform>
<RotateTransform Angle="180"></RotateTransform>
</Polygon.LayoutTransform>
</Polygon>
</Button>
</StackPanel>
Here is my case,
To create a common icon button, which can be used with different icons whereever.
Here are my steps:
1). create a custom IconButton derived from Button, it has a DefaultImageSource dependency property. Here it is:
public class IconButton : Button
{
public static readonly DependencyProperty DefaultImageSourceProperty =
DependencyProperty.Register("DefaultImageSource", typeof(ImageSource), typeof(IconButton), new FrameworkPropertyMetadata(null));//, new FrameworkPropertyMetadata(OnImageSourceChanged));
public ImageSource DefaultImageSource
{
get { return (ImageSource)GetValue(DefaultImageSourceProperty); }
set { SetValue(DefaultImageSourceProperty, value); }
}
}
2). Create a style for IconButton in project resource where supppose to use this IconButton with this style,
<Style x:Key="IconButtonTemplate" TargetType="{x:Type WpfApplication3:IconButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type WpfApplication3:IconButton}">
<Grid>
<Image Source="{Binding RelativeSource={RelativeSource Self}, Path=DefaultImageSource}" Stretch="Uniform" Width="Auto" Height="Auto" x:Name="imageArt"/>
<Ellipse x:Name="focusEllipse" Fill="Transparent"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="focusEllipse" Property="Fill" Value="#AAFFFFFF"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="focusEllipse" Property="Fill" Value="#AA808080"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="focusEllipse" Property="Fill" Value="#80808080"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
3). Create multi IconButton in my WPF window, and binding them to different icon, but no luck; icons don't show up when openning this window,
<Grid>
<DockPanel>
<WpfApplication3:IconButton Width="30" Height="30" DefaultImageSource="{DynamicResource RefreshIcon}" Style="{DynamicResource IconButtonTemplate}"></WpfApplication3:IconButton>
<WpfApplication3:IconButton Width="30" Height="30" DefaultImageSource="{DynamicResource RunIcon}" Style="{DynamicResource IconButtonTemplate}"></WpfApplication3:IconButton>
</DockPanel>
</Grid>
It might be issue of the wrong binding for the image resource, but can't figure out with several tries. Any suggestion? Thanks.
I can see the issue in Binding . Using
<Image Source="{Binding RelativeSource={RelativeSource Self}, Path=DefaultImageSource}" Stretch="Uniform" Width="Auto" Height="Auto" x:Name="imageArt"/>
using Self Mode you are trying to Bind Source to DefaultImageSource property of Image Control. And Image doesnot have any such property so bang.
Try this
<Image Source="{TemplateBinding DefaultImageSource}" Stretch="Uniform" Width="Auto" Height="Auto" x:Name="imageArt"/>
This will try to bind the Source of Image to DefaultImageSource property of Button.
I hope this will help.
I'm working on dragging objects around a Canvas, which are encapsulated in ListBoxItems -- the effect being to create a simple pseudo desktop.
I have a ListBox with a Canvas as the ItemsPanelTempalte, so that the ListBoxItems can appear anywhere on screen:
<ListBox ItemsSource="{Binding Windows}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<Canvas />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
I have a Style to define how the ListBoxItems should appear:
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="Canvas.Left" Value="{Binding Left, Mode=TwoWay}" />
<Setter Property="Canvas.Top" Value="{Binding Top, Mode=TwoWay}" />
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<local:PseudoWindowContainer Content="{TemplateBinding Content}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The "PseudoWindowContainer" extends from the ContentControl and has its own Style applied to make it look like a dialog box (title bar, close button, etc...). Here is a chunk of it:
<Style TargetType="{x:Type local:PseudoWindowContainer}">
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="Width" Value="{Binding Width, Mode=TwoWay}" />
<Setter Property="Height" Value="{Binding Height, Mode=TwoWay}" />
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:PseudoWindowContainer}">
<Grid Name="LayoutRoot" Background="White">
<!-- ... snip ... -->
<Border Name="PART_TitleBar" Grid.Row="0" Background="LightGray" CornerRadius="2,2,0,0" VerticalAlignment="Stretch" Cursor="Hand" />
<TextBlock Name="TitleBar_Caption" Text="{Binding DisplayName}" Grid.Row="0" Background="Transparent" Padding="5,0,0,0" HorizontalAlignment="Left" VerticalAlignment="Center" />
<Button Name="TitleBar_CloseButton" Command="{Binding CloseCommand}" Grid.Row="0" VerticalAlignment="Top" HorizontalAlignment="Right" Margin="0,5,5,0" Width="20" Height="20" Cursor="Hand" Background="#FFFF0000" Foreground="#FF212121" />
<!-- ContentPresenter -->
<ContentPresenter Grid.Row="1" />
<!-- ... snip ... -->
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="WindowBorder" Property="Background" Value="Blue" />
</Trigger>
<Trigger Property="IsSelected" Value="False">
<Setter TargetName="WindowBorder" Property="Background" Value="#22000000" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
Inside the PseudoWindowContainer.cs class I create some event handlers to listen for MouseDown/MouseUp/MoveMove events:
public override void OnApplyTemplate()
{
_titleBar = (Border)Template.FindName("PART_TitleBar", this);
if (_titleBar != null)
{
_titleBar.MouseDown += TitleBar_MouseDown;
_titleBar.MouseUp += TitleBar_MouseUp;
}
_grip = (ResizeGrip)Template.FindName("PART_ResizeGrip", this);
if (_grip != null)
{
_grip.MouseLeftButtonDown += ResizeGrip_MouseLeftButtonDown;
_grip.MouseLeftButtonUp += ResizeGrip_MouseLeftButtonUp;
}
base.OnApplyTemplate();
}
private void TitleBar_MouseDown(object sender, MouseButtonEventArgs e)
{
_titleBar.MouseMove += TitleBar_MouseMove;
((Border)sender).CaptureMouse();
_windowLocation.X = Left;
_windowLocation.Y = Top;
_clickLocation = this.PointToScreen(Mouse.GetPosition(this));
}
private void TitleBar_MouseUp(object sender, MouseButtonEventArgs e)
{
_titleBar.MouseMove -= TitleBar_MouseMove;
((Border)sender).ReleaseMouseCapture();
}
private void TitleBar_MouseMove(object sender, MouseEventArgs e)
{
Point currentLocation = this.PointToScreen(Mouse.GetPosition(this));
Left = _windowLocation.X + currentLocation.X - _clickLocation.X;
Top = _windowLocation.Y + currentLocation.Y - _clickLocation.Y;
}
The trouble I run into is the "Left" and "Top" are not defined properties, and updating them to Canvas.SetLeft/SetTop (or GetLeft/GetTop, accordingly) does not update the position on the Canvas.
I have "Left" and "Top" defined in the ViewModel of the controls I place into the ListBoxItems, and are thus subsequently wrapped with a PseudoWindowContainer because of the Template. These values are being honored and the objects do appear in the correct location when the application comes originally.
I believe I need to somehow define "Left" and "Top" in my PseudoWindowContainer (aka: ContentControl) and have them propagate back up to my ViewModel. Is this possible?
Thanks again for any help!
I've found a solution to the problem. Instead of typing it all out again, I will point to the MSDN Forum post that describes what I did:
http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/d9036b30-bc6e-490e-8f1e-763028a50153
Did you read article by Bea Stollnitz: The power of Styles and Templates in WPF?
That is an example of Listbox where items are drawn at specific coordinates calculated in Converter.