I have a datatemplate used for datagridtemplatecolumn
I am trying to show different image on mouse over in Image.
On mouse over, the cursor is changing but image is not changing.
<DataTemplate x:Key="MyDataTemplate" DataType="DataRowView">
<StackPanel Orientation="Horizontal" Background="Transparent">
<Image Margin="0,0,0,0" Width="50" Height="50" Source="{Binding Converter={StaticResource SetImgToDG}}" ToolTip="{Binding}" >
<Image.Resources>
<Style TargetType="{x:Type Image}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<!-- Hover image -->
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Source" Value="C:\Images\Coil3.png"/>
</Trigger>
</Style.Triggers>
</Style>
</Image.Resources>
</Image>
</StackPanel>
</DataTemplate>
Is that binding creates the problem??
How to resolve it??
Your problem is that the initial source of the image is defined directly on the Source property of the image instance.
When there are multiple things that try to set the value of a dependency property, the framework has to decide which value to use.
In your case the value is being set directly on the image instance (locally) and also by a Trigger.
The local value will always win in this case, so nothing happens when the Trigger is activated.
If you set the initial value in the style instead, the Trigger will win when it tries to change the image source, and that will make the image change when the mouse hovers over it.
You can read more about how the value of a Dependency Property is being resolved on MSDN.
<Image.Resources>
<Style TargetType="{x:Type Image}">
<!-- Set the initial source in the style so the trigger can change it -->
<Setter Property="Source" Value="{Binding Converter={StaticResource SetImgToDG}}" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<!-- Hover image -->
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Source" Value="C:\Images\Coil3.png"/>
</Trigger>
</Style.Triggers>
</Style>
</Image.Resources>
Related
Let's say I have a button and I have an image (though it could be any controls) inside of it:
<Button Width="150" Height="80">
<Image Source="..." Width="50" Height="50" />
</Button>
I want to change the style of button when mouse is over it and make it so that I could also change properties of the image inside when it happens.
<Style TargetType="Button">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Opacity" Value="0.5" />
<!-- Here I want to change alignment of the image inside the button if there is one -->
<Setter Property="Image.HorizontalAlignment" Value="Right" />
</Trigger>
</Style.Triggers>
</Style>
But it doesn't work this way, and for some reason any child controls start to change alignment, not only images but also text and other controls. The other things I tried just didn't compile. Probably DataTemplate should be used; I'm new to WPF and XAML and I still don't understand it enough and couldn't find what I need yet.
You should use HorizontalContentAlignment to set the content alignment of a button:
<Setter Property="HorizontalContentAlignment" Value="Right" />
Based on your comment below, I can give an example:
<Button Grid.Row="2" Width="150" Height="80">
<DockPanel Height="80" Width="150"><!-- A more complex control here-->
<Image Width="50" Height="50">
<Image.Source>
<BitmapImage DecodePixelWidth="50" UriSource="https://www.gravatar.com/avatar/9eae4ae63d70142e81f0365de42474ae?s=32&d=identicon&r=PG&f=1" />
</Image.Source>
</Image>
</DockPanel>
<Button.Style>
<Style TargetType="Button">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Opacity" Value="0.5" />
</Trigger>
</Style.Triggers>
<Style.Resources>
<Style TargetType="Image"><!-- The style target to the image control only in the button control -->
<Style.Triggers>
<!-- Binding to IsMouseOver of the button-->
<DataTrigger Binding="{Binding IsMouseOver, RelativeSource={RelativeSource AncestorType={x:Type Button}}}" Value="True">
<Setter Property="HorizontalAlignment" Value="Right" />
</DataTrigger>
</Style.Triggers>
</Style>
</Style.Resources>
</Style>
</Button.Style>
</Button>
I am making a little project, in which I am using data validation. Now I am trying to make styling for TextBox, when the input is not correct. I want to make a red border around the TextBox and a ToolTip with error message, which I return from C# code.
I started with making the red border. I wrote this in XAML:
<Window.Resources>
<Style x:Key="ErrorTemplate" TargetType="TextBox">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="BorderBrush" Value="Red"></Setter>
<Setter Property="BorderThickness" Value="5"></Setter>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
But if I write it like this, BorderThickness property is changing inner border thickness of the TextBox. With the code above, I get this:
Is there a way, to avoid this, and get something like this?
And in a way, that I can add that ToolTip, using the same Style.
EDIT:
Code of TextBox:
<TextBox
Grid.Row="1"
Grid.Column="3"
Margin="10px"
FontSize="14pt"
VerticalAlignment="Center"
Padding="5px"
Text="{Binding Path=Name, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
Style="{StaticResource ErrorTemplate}">
<TextBox.DataContext>
<local:Data/>
</TextBox.DataContext>
</TextBox>
The blue border that you see is the border of the TextBox itself, which is light blue by default in its keyboard focused state. The border is 5 dips thick, because you explicitly set it in your provided ErrorTemplate style. The red line around it is the default error template of the TextBox.
In order to meet your requirements, create a style like below.
Set a general Margin of 5 dips to account for the border that is displayed on error, it could otherwise be cut off outside the container since it is just an overlay over the original TextBox and it is not resized.
Set an optional default tool tip for the non-error state.
Set an ErrorTemplate, which is a special template dedicated to the error state, where AdornedElementPlaceholder represents the original TextBox in the template.
Set a trigger that changes the tool tip text to the validation error in error state.
<Style x:Key="MyTextBoxValidationStyle" TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}">
<Setter Property="Margin" Value="5"/>
<Setter Property="ToolTip" Value="There is no error."/>
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<StackPanel>
<Border BorderBrush="Red" BorderThickness="5">
<AdornedElementPlaceholder/>
</Border>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}" />
</Trigger>
</Style.Triggers>
</Style>
Apply the style to your TextBox using the Style property.
<TextBox Style="{StaticResource MyTextBoxValidationStyle}" ...>
Here is a sample screenshot of the result.
I have the following ToggleButton-Style:
<Style x:Key="GraphToggleButtonStyle" TargetType="ToggleButton">
<Style.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Content">
<Setter.Value>
<Image Source="{StaticResource Graph}" />
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Content">
<Setter.Value>
<Image Source="{StaticResource Graph_Off}" />
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
I'm trying to reuse this for my ToggleButtons (it's a list) - so every item in my list has one ToggleButton. The problem is, that when I click on my ToggleButton, the icon of the buttons, which aren't clicked disappears. Only my clicked button shows the desired image... Am I doing something wrong with this style?
My ToggleButton-Implementation:
<ToggleButton Style="{StaticResource GraphToggleButtonStyle}"
ToolTip="{x:Static res:Resources.UseGraphToggle}"
Visibility="{Binding Selected,
Converter={StaticResource BoolToVisibilityConverter}}" />
You don't need to add child (Image) into Visual Tree whenever button IsChecked property changes.
Issue is Style's are shared by default unless you set x:Shared="False" and second any Visual can be added only in one Visual tree. If you add Visual in another Visual tree, it will be removed form previous Visual tree. Visual in your case is Image control.
In your case setting x:Shared="False" will work but that will break the re-usability feature of resources. So, I would suggest instead of creating new instance of Image control everytime, create Image control only once and in triggers change the Image Source.
<Style x:Key="GraphToggleButtonStyle" TargetType="ToggleButton">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Image x:Name="image"/>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsChecked,
RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType=ToggleButton}}" Value="True">
<Setter TargetName="image" Property="Source"
Value="{StaticResource Graph}"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsChecked,
RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType=ToggleButton}}" Value="False">
<Setter TargetName="image" Property="Source"
Value="{StaticResource Graph_Off}"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
The Image in your style is a visual. One visual can only be used once in the visual tree. Instead of reusing the style let WPF create a new one each time its referenced:
<Style x:Key="GraphToggleButtonStyle" TargetType="ToggleButton" x:Shared="False">
....
I wanted to restyle my buttons to be more flat so I have created two styles; first for ToggleButton that derives from ToolBar.ToggleButtonStyleKey and second for Buttonthat derives from ToolBar.ButtonStyleKey.
It worked great - the buttons are now toolbar-like and flat. Second thing I wanted is to have Background property to be transparent when user hovers the cursor over the control. So to achieve that I defined a simple trigger that sets the Background to Transparent on IsMouseOver event. It worked for ToggleButton, however, the same trigger didn't work for Button(the background was not affected at all).
Does anyone know why this trigger works great for ToggleButton and does not work for Button? I did expect the same behavior since both styles are from the same family.
Below is the full code.
<Window x:Class="WpfButtonsTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style x:Key="FlatToggleButton" TargetType="ToggleButton"
BasedOn="{StaticResource {x:Static ToolBar.ToggleButtonStyleKey}}">
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Focusable" Value="False"/>
<Setter Property="Background" Value="Transparent"/>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Transparent"/>
</Trigger>
</Style.Triggers>
</Style>
<Style x:Key="FlatButton" TargetType="Button"
BasedOn="{StaticResource {x:Static ToolBar.ButtonStyleKey}}">
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Focusable" Value="False"/>
<Setter Property="Background" Value="Transparent"/>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Transparent"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<StackPanel>
<ToggleButton Style="{StaticResource FlatToggleButton}">
I am Toggle Button
</ToggleButton>
<Button Style="{StaticResource FlatButton}">
I am Button
</Button>
</StackPanel>
</Grid>
</Window>
I had a look using Snoop (a very handy program for inspecting WPF ) and it looks like the template which you're using as a basis, ToolBar.ButtonStyleKey, has a trigger which selects a solid Brush for the background of a Border element within the Button (in thise case when IsMouseOver is true).
Your local style trigger is successfully setting the background of the Button element to transparent (or rather, keeping it transparent), but the Border background is unaffected, so you'll still see the highlighting behaviour.
Border Background:
Button Background:
I think you'll have to define a ControlTemplate to get the button you're after, I've grabbed this from one of the ToolBar samples included in Kaxaml (a nice XAML editor). It's a reasonable facsimile of the Toolbar bas button style, with a few bits removed, it may behave as you want, or you might need to tweak it depending on your desired behaviour.
I've left the IsPressed trigger in place, you may want to remove it, or add additional triggers.
<Style x:Key="ToolBarButtonBaseStyle" TargetType="{x:Type ButtonBase}">
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ButtonBase}">
<Border
x:Name="Border"
BorderThickness="1"
Background="Transparent"
BorderBrush="Transparent">
<ContentPresenter
Margin="2"
HorizontalAlignment="Center"
VerticalAlignment="Center"
RecognizesAccessKey="True"/>
</Border>
<ControlTemplate.Triggers>
<!-- Additional triggers removed, e.g "IsMouseOver" -->
<!-- You may not want any at all -->
<Trigger Property="IsPressed" Value="true">
<Setter TargetName="Border" Property="Background" Value="#E0E0E0" />
<Setter TargetName="Border" Property="BorderBrush" Value="#606060" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I see that the both FlatToggleButton and FlatButton styles already have Background as Transparent
<Setter Property="Background" Value="Transparent"/>
When the triggers is fired on IsMouseOver and set the Background again to Transparent you will not see any difference
So what you need to do is one of these options :
Change both styles so that the Background is something else than Transparent
Change the trigger so it sets the Background to something else than Transparent
I'm trying to customize my ToggleButtons so that when checked they say 'Yes' in green and when not checked, say 'No' in red.
I've created the following style which is sitting in my Styles resource dictionary.
<!-- ToggleButtons -->
<Style x:Key="YesNoToggleStyle" TargetType="ToggleButton">
<Style.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Background" Value="SpringGreen" />
<Setter Property="Content">
<Setter.Value>
<TextBlock Text="Yes"/>
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Background" Value="Crimson" />
<Setter Property="Content">
<Setter.Value>
<TextBlock Text="No"/>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
This works ... sort of. If the ToggleButton is the last one of either value, then it displays correctly. All previous buttons with the same value are blank. The height was also shrinking, but I fixed that with the 'Height' Setter above the triggers. To illustrate, when a new record is being created it looks like:
and after I've clicked buttons 1, 2, and 3 and 1 again:
I originally had the style referenced from the surrounding grid:
<Grid>
...
<Grid.Resources>
<Style BasedOn="{StaticResource YesNoToggleStyle}" TargetType="{x:Type ToggleButton}" />
</Grid.Resources>
But changing that so each ToggleButton references the style individually (<ToggleButton Style="{StaticResource YesNoToggleStyle}" ... />) hasn't made a difference.
I looked at Customizing the toggle state of a toggle button in wpf, and Override ToggleButton Style where the effect is the same, but they talk about external images, and my issues is all within wpf.
I also looked at the second answer to: i want to change backcolor of toggle button when toggle button ischecked and viceversa in WPF but a) I only have the blend + sketchflow preview that comes with VS2012, and b) i'm a total noob with blend and can't get from Select the "Checked State" to Reset the Background Color instruction in the answer (plus i'd be surprised if this task requires the blend tool).
Can anyone show me what to do to get multiple ToggleButtons to use the same style properly?
This works for me. Somewhere in Dictionary1.xaml:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style x:Key="YesNoToggleStyle" TargetType="{x:Type ToggleButton}" BasedOn="{StaticResource {x:Static ToolBar.ToggleButtonStyleKey}}">
<Style.Triggers>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Background" Value="Crimson" />
<Setter Property="Content" Value="No"/>
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Background" Value="SpringGreen" />
<Setter Property="Content" Value="Yes"/>
</Trigger>
</Style.Triggers>
</Style>
</ResourceDictionary>
Note, that style is based on ToolBar.ToggleButtonStyle.
<Grid>
<Grid.Resources>
<ResourceDictionary Source="pack://application:,,,/Dictionary1.xaml"/>
</Grid.Resources>
<ItemsControl ItemContainerStyle="{StaticResource YesNoToggleStyle}">
<ToggleButton />
<ToggleButton />
<ToggleButton />
</ItemsControl>
</Grid>
try to replace Content property to ContentTemplate:
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<TextBlock Text="Yes"/>
</DataTemplate>
</Setter.Value>
</Setter>
In my case I wanted to have a "Locked" ToggleButton in a common dll defined and reused across my Apps.
Here's my result, which worked for me. Maybe someone find it useful (put this in a Resourcedictionary.xaml):
<BitmapImage x:Key="LockedLock"
UriSource="/...;component/Resources/Lock_closed_16p.png" />
<BitmapImage x:Key="OpenLock"
UriSource="/...;component/Resources/Lock_open_16p.png" />
<Style x:Key="LockButton"
TargetType="ToggleButton">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Image Source="{DynamicResource OpenLock }"
Width="12"
Height="12"
Name="contentimage" />
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=ToggleButton , AncestorLevel=1, Mode=FindAncestor }, Path=IsChecked}"
Value="True">
<Setter Property="Image.Source"
TargetName="contentimage"
Value="{DynamicResource LockedLock }" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
Credits to:
Setting Button's Content to <Image> via Styles
Setter Target Name not recognized