Is it possible to bind the alpha value of an element to a slider?
For example, this is code that allows the slider to change the height and top position of the element, but what is the syntax to control the alpha value in the Background attribute of the border?
<Window x:Class="WpfApplication25.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Grid Background="Tan">
<StackPanel>
<Canvas>
<Border Background="#{Binding ElementName=theSlider, Path=Value}ffff00"
Canvas.Left="40"
Canvas.Top="{Binding ElementName=theSlider, Path=Value}"
CornerRadius="5"
BorderBrush="Brown"
BorderThickness="1"
>
<Rectangle
Height="{Binding ElementName=theSlider, Path=Value}"
Width="50"
/>
</Border>
</Canvas>
</StackPanel>
<Slider Name="theSlider" HorizontalAlignment="Left" Width="200" Minimum="10" Maximum="200" Cursor="Hand"/>
</Grid>
</Window>
Bind to the "Opacity" property, don't forget to set the slider minimum to 0 and maximum to 1
Related
The short version of my question is: Can properties of the UserControl be made available to the children of the UserControl without applying to the UserControl at the same time?
The long version: I am trying to create a "ButtonInput" which is a text box with a bitmap button at the right side, inside of the text box's border. This is pretty much how the search boxes look on many web sites (or in Visual Studio), with a magnifying glass at the right side.
The UserControl definition is:
<UserControl x:Class="Test.Controls.ButtonInput"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Test.Controls"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
<Grid Background="Transparent">
<Border
Name="Border"
CornerRadius="6"
Padding="4"
Margin="2 2 2 2"
Background="{Binding Path=Background, RelativeSource={RelativeSource FindAncestor, AncestorType=local:ButtonInput, AncestorLevel=1}}"
BorderBrush="{Binding Path=BorderBrush, RelativeSource={RelativeSource FindAncestor, AncestorType=local:ButtonInput, AncestorLevel=1}}"
BorderThickness="1"
>
<Grid Background="Transparent">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBox x:Name="tbInput"
Grid.Column="0"
MaxLines="1"
Background="Transparent"
Foreground="{Binding Path=Foreground, RelativeSource={RelativeSource FindAncestor, AncestorType=local:ButtonInput, AncestorLevel=1}}"
Text="{Binding Path=Text, RelativeSource={RelativeSource FindAncestor, AncestorType=local:ButtonInput, AncestorLevel=1}}"
BorderThickness="0"/>
<Button Width="24" Grid.Column="1" Click="Button_Click">
<Button.Template>
<ControlTemplate>
<Image x:Name="imgIcon"
Source="{Binding Path=Source, RelativeSource={RelativeSource FindAncestor, AncestorType=local:ButtonInput, AncestorLevel=1}}" />
</ControlTemplate>
</Button.Template>
</Button>
</Grid>
</Border>
</Grid>
</UserControl>
I place this control in a test Window.
<Window x:Class="Test.TestWindow"
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:Test"
xmlns:controls="clr-namespace:Test.Controls"
mc:Ignorable="d"
Title="TestWindow" Height="450" Width="800">
<Grid>
<StackPanel Orientation="Horizontal" Height="380" Width="402">
<Label Content="Password" Width="75" VerticalAlignment="Center"/>
<controls:ButtonInput x:Name="biTest" Source="Resources/img/password.png" Width="300" Height="35" Background="Orange" Foreground="Red" BorderBrush="Black" ButtonClick="ButtonInput_ButtonClick" />
</StackPanel>
</Grid>
</Window>
The problem I have is that I expect to have only what is inside the border colored orange, but instead the orange bleeds outside the border. I traced the problem to the way the Live Visual Tree looks like:
(ButtonInput)
(Border)
(ContentPresenter)
(Grid)
Border (Border)
(Grid)
tbInput (TextBox)
(Button)
The first Border is not in my control definition, but its background is Orange as inherited from the ButtonInput.
I did try an alternative: instead of using child controls for the content of the UserControl, I used a ControlTemplate with the same content. In this case, the executable looked OK (rounded rectangle with black border and orange background, no bleeding outside the border), but the designer in Visual Studio does not show anything. There is literally a blank space where the ButtonInput should be.
So, is there a way to prevent the properties set on the UserControl to apply to the first Border? Background is one example but there are other properties that I want to make use of the same way.
What's happening here is that your "ButtonInput" control isn't actually a button, it's a user control which just so happens to have a button on it. So when you set the background in the <controls:ButtonInput> tag on your main window you're effectively saying "ignore everything this user control says about the color of it's entire background because I'm now overriding it".
There are several ways around this, but the easiest one from the UserControl's perspective is to use the one last weapon in its arsenal: the template. Overriding the template in a control effectively says "I'm no longer going to be displayed the way a control of my type normally is, so all the usual settings won't apply unless I explicitly use them. That's as simple as doing this in your ButtonInput xaml:
<UserControl.Template>
<ControlTemplate>
<!-- all your old xaml code goes here -->
<Grid Background="Transparent">
<Border
Name="Border"
CornerRadius="6"
Padding="4"
<!-- etc -->
</ControlTemplate>
</UserControl.Template>
Which results in the following:
Truth be told, there are few cases in WPF where custom controls are actually needed, and this is almost certainly one of them. WPF is more than capable of supporting functionality like this with styles and templates alone. But this answer should suit your needs in the short term.
EDIT: If you want the control to be visible in the designer then populate it with a regular control and template that instead, it's what you probably should be doing anyway. Now your xaml should look like this:
<UserControl x:Class="WpfTestApp.Controls.ButtonInput"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfTestApp.Controls"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800"
x:Name="_this">
<UserControl.Resources>
<ControlTemplate x:Key="ButtonTemplate" TargetType="{x:Type Button}">
<Grid Background="Transparent">
<Border
Name="Border"
CornerRadius="6"
Padding="4"
Margin="2 2 2 2"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="1"
>
<Grid Background="Transparent">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBox x:Name="tbInput"
Grid.Column="0"
MaxLines="1"
Background="Transparent"
Text="{Binding ElementName=_this, Path=Text, Mode=TwoWay, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}"
Foreground="{TemplateBinding Foreground}"
BorderThickness="0" Margin="0,-1,0,1"/>
<Button Width="24" Grid.Column="1">
<Button.Template>
<ControlTemplate>
<Image x:Name="imgIcon" />
</ControlTemplate>
</Button.Template>
</Button>
</Grid>
</Border>
</Grid>
</ControlTemplate>
</UserControl.Resources>
<Button x:Name="biTest" Width="300" Height="35" Background="Orange" Foreground="Red" BorderBrush="Black" Template="{StaticResource ButtonTemplate}" />
</UserControl>
You haven't addressed the Text binding in your question, the code above is expecting a dependency property in the UserControl code behind:
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(ButtonInput), new PropertyMetadata(String.Empty));
And you now use it like this:
<controls:ButtonInput x:Name="biTest" Width="300" Height="35" Text="{Binding MyText, Mode=TwoWay}" />
I have the following XAML:
<Window x:Class="test_stacking.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">
<StackPanel Background="AliceBlue">
<Canvas Background="Red">
</Canvas>
<ListBox Width="200" VerticalAlignment="Bottom">
<TextBlock Text="One" />
<TextBlock Text="Two" />
</ListBox>
</StackPanel>
</Window>
I would like the Canvas to be on top, and the ListBox to be on the bottom. Since the default orientation for a StackPanel is vertical, I thought I would get the Canvas and the ListBox, in that order, stacked within the StackPanel.
But instead, I get what is shown below: the ListBox is on top, and the Canvas does not show at all. What am I doing wrong?
.NET FW 4 Client Profile, Windows 7, VS 2010.
If it is not mandatory to use StackPanel then you can achieve that by using Grid's * sizing.
Here is an example:
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="500" Width="500">
<Grid Background="AliceBlue">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Canvas Background="Red">
</Canvas>
<ListBox Grid.Row="1" Width="200" VerticalAlignment="Bottom">
<TextBlock Text="One" />
<TextBlock Text="Two" />
</ListBox>
</Grid>
</Window>
Output:
Or
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="500" Width="500">
<Grid Background="AliceBlue">
<Canvas Background="Red">
</Canvas>
<ListBox Width="200" VerticalAlignment="Bottom">
<TextBlock Text="One" />
<TextBlock Text="Two" />
</ListBox>
</Grid>
</Window>
Output:
Since you haven't set any height or width to the canvas, the height and width for the canvas is set to zero and thats why its not shown in the UI.
Try this
<StackPanel Background="AliceBlue">
<Canvas Background="Red" Width="200" Height="200">
</Canvas>
<ListBox Width="200" VerticalAlignment="Bottom">
<TextBlock Text="One" />
<TextBlock Text="Two" />
</ListBox>
</StackPanel>
I have 5 borders inside a stackpanel and each border has a width as Window width/5. When I am maximizing the window then each border width should get resize according to window width/5.
I have tried with converter but it does' not work as how converter will come to know window has resized.
<Window x:Class="ItemPanelTemplateTest.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">
<StackPanel Orientation="Horizontal">
<Border Height="20" Background="Red" Width="105" />
<Border Height="20" Background="Green" Width="105" />
<Border Height="20" Background="Yellow" Width="105" />
<Border Height="20" Background="Blue" Width="105" />
<Border Height="20" Background="Orange" Width="105" />
</StackPanel>
</Window>
I don't want to write anything on codebehind as I am using MVVM.
Use different container than StackPanel. The best candidates here are Grid and UniformGrid, but since the latter requires less typing, here it is:
<Window x:Class="WpfApplication1.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">
<UniformGrid Height="20" Rows="1">
<Border Background="Red" />
<Border Background="Green" />
<Border Background="Yellow" />
<Border Background="Blue" />
<Border Background="Orange" />
</UniformGrid>
</Window>
The grid will resize automatically with the window and then resize its contents uniformly.
I am reading a Pro Silverlight 4 book (http://my.safaribooksonline.com/book/programming/csharp/9781430229797/xaml/element-to-element_binding), and I do all examples from the book. But an example from the binding chapter doesnt work for me. The slider doesnt move after I compile and run the application:
<UserControl
x:Class="SilverlightApplication14.MainPage"
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"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400">
<Grid
x:Name="LayoutRoot"
Background="White">
<Slider
x:Name="sliderFontSize"
Margin="3"
Minimum="1"
Maximum="40"
Value="10"></Slider>
<TextBlock
Margin="10"
Text="Simple Text"
x:Name="lblSampleText"
FontSize="{Binding ElementName=sliderFontSize, Path=Value}"></TextBlock>
</Grid>
Dave S, is absolutely correct. You can see the Z-Index problem reversing the order of the controls (so the TextBlock is before the Slider)- it will then work because the slider will be on top of the TextBlock:
<Grid
x:Name="LayoutRoot"
Background="White">
<TextBlock
Margin="10"
Text="Simple Text"
x:Name="lblSampleText"
FontSize="{Binding ElementName=sliderFontSize, Path=Value}"></TextBlock>
<Slider
x:Name="sliderFontSize"
Margin="3"
Minimum="1"
Maximum="40"
Value="10"></Slider>
</Grid>
You can see here that Z-Index is determined by the order of controls in the XAML.
An alternate way round this (or to demonstrate) is to specify the Z-Index attached property explicitly:
<Grid
x:Name="LayoutRoot"
Background="White">
<Slider
x:Name="sliderFontSize"
Margin="3"
Minimum="1"
Maximum="40"
Value="10" Canvas.ZIndex="1"></Slider>
<TextBlock
Margin="10"
Text="Simple Text"
x:Name="lblSampleText"
FontSize="{Binding ElementName=sliderFontSize, Path=Value}"></TextBlock>
</Grid>
The best way to fix this is to simply make sure that the elements don't overlap each other, by putting them in different rows:
<Grid
x:Name="LayoutRoot"
Background="White">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Slider Grid.Row="1"
x:Name="sliderFontSize"
Margin="3"
Minimum="1"
Maximum="40"
Value="10"></Slider>
<TextBlock
Margin="10"
Text="Simple Text"
x:Name="lblSampleText"
FontSize="{Binding ElementName=sliderFontSize, Path=Value}"></TextBlock>
</Grid>
In this sample, the TextBlock is in row 0 and the slider is in row 1, so they no longer overlap.
Both the Slider and the TextBlock are in the Grid in the same position (0,0). This means the TextBlock is being shown drawn directly on top of the Slider so any mouse events will always be captured by the TextBlock and not the Slider. This is implicitly implied as the TextBlock has the higher Z-Index by being defined second in the Grid. If you re-arrange the Grid and apply either Grid.Row="1" or Grid.Column="1" to the TextBlock so it is beside the Slider control you should be able to use the Slider successfully.
I've got a root UserControl that is 300 high.
Inside that I have a Border that I want to expand to the size of its own controls, so if I stack in more controls, it will expand -- less controls, it will contract.
However when I set it to "Auto" it expands it out to the size of its parent container instead of the size of its child controls.
How can I get Border to expand and contract to the size of its child controls, something like the functionality of an HTML table?
<UserControl x:Class="Second105.Page"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:basics="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
Width="400" Height="300">
<Grid x:Name="LayoutRoot" Background="White">
<Border
Background="Tan"
CornerRadius="10"
Padding="10"
Width="300"
Height="Auto">
<StackPanel>
<TextBlock HorizontalAlignment="Center" Margin="0 0 0 5">Please select a <Run FontStyle="Italic">week day</Run>:</TextBlock>
<basics:Calendar
Name="theCalendar"
SelectedDatesChanged="Calendar_SelectedDatesChanged"/>
<TextBlock
Name="theMessage"
Margin="0 10 0 0"
HorizontalAlignment="Center"
Text="..."/>
</StackPanel>
</Border>
</Grid>
</UserControl>
Wrap it in a StackPanel should do it:
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:basics="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="400"
Height="300">
<Grid x:Name="LayoutRoot" Background="White">
<StackPanel>
<Border
Width="300"
Height="Auto"
Background="Tan"
CornerRadius="10"
Padding="10">
<StackPanel>
<TextBlock HorizontalAlignment="Center" Margin="0 0 0 5">Please select a
<Run FontStyle="Italic">week day
</Run>:
</TextBlock>
<TextBlock
Name="theMessage"
HorizontalAlignment="Center"
Margin="0 10 0 0"
Text="..."/>
</StackPanel>
</Border>
</StackPanel>
</Grid>
</UserControl>