As of now, i assign the image of a TreeView item using a direct binding to the image's source:
<DataTemplate DataType="{x:Type local:GeoPoint}">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Color}" Height="32" />
<TextBlock Text="{Binding Name}" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
the Color binding is referring to string containing the path to the PNG, something like "/Resources/red.png"
i would like to make the Color variable of custom type "MarkerColor", an enum containing several colors, and have the image source binding reference this value, so that if
Color = MarkerColor.green; the binding would reference "/Resources/green.png"
Note that the name of the PNG is not necessarily the same as the name of MarkerColor, an "adapter" should be used to convert the type
I know how to do this in Java Android SDK, but not really sure on how to achive this in Wpf
You could create a converter that knows how to convert the enumeration value to a valid resource:
public class ColorResourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
MarkerColor color = (MarkerColor)value;
Uri uri;
switch(color)
{
case MarkerColor.Green:
uri = new Uri("Resources/green.png");
break;
case MarkerColor.Red:
uri = new Uri("Resources/red.png");
break;
//...
default:
uri = new Uri("Resources/default.png");
break;
}
return new BitmapImage(uri);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
}
Usage:
<DataTemplate DataType="{x:Type local:GeoPoint}">
<DataTemplate.Resources>
<local:ColorResourceConverter x:Key="ColorResourceConverter" />
</DataTemplate.Resources>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Color, Converter={StaticResource ColorResourceConverter}}" Height="32" />
<TextBlock Text="{Binding Name}" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
Related
I'm developing a small application that needs to check some availability properties. I'm using for the user interface WPF. I need to change some foreground colors if a selection from a combobox. I have this DataTemplate:
<DataTemplate x:Key="userTemplate">
<TextBlock VerticalAlignment="Center">
<Image Source="imgsource.png" Height="25" Width="25" />
<Run Text="{Binding BooleanObjectName}" Foreground="{Binding boolobject, Converter={StaticResource convAvailability}}"/>
</TextBlock>
So I'm using for this convertion a IValueConverter that sets the color to the foreground:
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
BooleanObject boolobject = (BooleanObject)value;
if (boolobject.IsBoolValueOne) return System.Drawing.Brushes.Green;
else if (boolobject.IsBoolValueTwo) return System.Drawing.Brushes.Red;
else if (boolobject.IsBoolValueThree) return (SolidColorBrush)(new BrushConverter().ConvertFrom("#d3d300"));
else return System.Drawing.Brushes.Black;
}
What is wrong with this, because in my interface I'm always getting the black color. Any thoughts on this ?
Any help would be very much appreciated.
Thanks in advance.
As pointed out by #Funk you return the wrong kind of brushes. You should return a System.Windows.Media.Brush object:
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
BooleanObject boolobject = (BooleanObject)value;
if (boolobject.IsBoolValueOne)
return System.Windows.Media.Brushes.Green;
else if (boolobject.IsBoolValueTwo)
return System.Windows.Media.Brushes.Red;
else if (boolobject.IsBoolValueThree)
return (SolidColorBrush)(new BrushConverter().ConvertFrom("#d3d300"));
return System.Windows.Media.Brushes.Black;
}
Then it should work provided that your binding to the boolobject property actually works. Otherwise your converter won't get invoked at all.
If you want to bind to the object itself, you should specify a path of '.':
<TextBlock VerticalAlignment="Center">
<Image Source="imgsource.png" Height="25" Width="25" />
<Run Text="{Binding BooleanObjectName}" Foreground="{Binding Path=., Converter={StaticResource convAvailability}}"/>
</TextBlock>
I am trying to assign an image for each of my pivot items's header instead of a Text .
I tried several methods (one was given by this post http://social.msdn.microsoft.com/Forums/wpapps/en-US/e7b5fd17-3465-4a94-81af-5c056c992c11/add-image-to-pivot-title?forum=wpdevelop )
I managed to assign the same image for my pivot but not one image for each header.
This is what I tried :
<phone:Pivot.HeaderTemplate >
<DataTemplate>
<Image Source="21.jpg" Height="55" Width="55"/>
</DataTemplate>
</phone:Pivot.HeaderTemplate>
This obviously gave me the same image for each headers ,
So i wanted to try something like this :
<phone:Pivot.HeaderTemplate >
<DataTemplate>
<Image Source="{Binding}" Height="55" Width="55"/>
</DataTemplate>
</phone:Pivot.HeaderTemplate>
[...]
<phone:PivotItem ??? >
<// phone:PivotItem >
But then i don't know what to add my image path.
i used this method when i wanted to assign a text as a header and it worked :
<phone:Pivot.HeaderTemplate >
<DataTemplate>
<TextBlock Text="{Binding }" FontSize="88" />
</DataTemplate>
</phone:Pivot.HeaderTemplate>
<phone:PivotItem Header = "Title1" />
How can i assign an image for each of my Header ?
You should be able to simply provide the image source in the Header:
<phone:PivotItem Header = "21.jpg" />
This sets the data context to use for the HeaderTemplate for that particular item.
You need to use a Converter Class to solve this issue.
namespace MyImageConvertor
{
public class MyValueConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
try
{
var uri = new Uri((string)(value), UriKind.RelativeOrAbsolute);
var img = new BitmapImage(uri);
return img;
}
catch
{
return new BitmapImage();
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var img = value as BitmapImage;
return img.UriSource.AbsoluteUri;
}
#endregion
}
}
Then use the this convertor in your xaml.
<UserControl x:Class="ValueConverter.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"
xmlns:this="clr-namespace:MyImageConvertor">
<UserControl.Resources>
<this:MyValueConverter x:Key="ImageConverter"/>
</UserControl.Resources>
<phone:Pivot>
<phone:Pivot.HeaderTemplate>
<DataTemplate>
<Image Source="{Binding ImageUrlProperty, Converter={StaticResource ImageConverter},Mode=TwoWay}"></Image>
</DataTemplate>
</phone:Pivot.HeaderTemplate>
</phone:Pivot>
Make sure you have the full image path in the ImageUrlProperty value like ..\Images\logo.png.
I am using IValueconverter interface to change the tooltip text of an image.
The tool tip should change based on label.
<Label Content="9898980001" Height="28" HorizontalAlignment="Left" Margin="1733,231,0,0" Name="lbl02scanning" VerticalAlignment="Top" Foreground="Blue" >
<Image Height="49" HorizontalAlignment="Right" Margin="0,131,113,0"
Name="img02scanning"
Source="/TEST;component/Images/LoadingStation.png" Stretch="Fill"
VerticalAlignment="Top" Width="30" Cursor="Hand">
<Image.ToolTip>
<StackPanel Background="AliceBlue">
<TextBlock Padding="5" Foreground="White" MinHeight="20"
Background="Blue" FontWeight="Bold"
Text="Scanning Station" />
<StackPanel Orientation="Horizontal">
<Image
Source="pack://application:,,,/TEST;component/Images/coilonsaddle_large.png"
Height="100" Width="100" />
<TextBlock Padding="10" TextWrapping="WrapWithOverflow"
MaxWidth="200" Background="AliceBlue"
Foreground="Black" FontWeight="Bold"
Text="{Binding ElementName=lbl02scanning, Path=Name,
ConverterParameter=255,
Converter={StaticResource FormatterFOrCoilToolTip}}"/>
</StackPanel>
<TextBlock Padding="5" Foreground="White" MinHeight="20"
Background="Blue" FontWeight="Bold"
Text="Report to admin in case of coil location mismatch"/>
</StackPanel>
</Image.ToolTip>
</Image>
The converter class:
public class FormatterForCoilToolTip : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if(parameter.ToString() == "02")
{
return value.ToString() + " Startin";
}
else
{
return value.ToString() + " Finishing";
}
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
The tooltip's Textblock content is not changing. But if i change to:
Text="{Binding ConverterParameter=255, Converter={StaticResource FormatterFOrCoilToolTip}}
then it is working. But i want to pass the lbl02scanning text value. Why it is not working??
First of all you should bind to Content property and not Name property in case you want Text of Label.
Most importantly Tooltip does not lies in same Visual Tree as that of label, hence binding with elementName won't work. However, you can use x:Reference to get the element even if it doesn't exist in same Visual Tree.
Text="{Binding Source={x:Reference lbl02scanning}, Path=Content,
ConverterParameter=255,
Converter={StaticResource FormatterFOrCoilToolTip}}"/>
Note - x:Reference is introduced in WPF 4.0. If you are using WPF 3.5 you can't use this.
Update for error - service provider is missing the name resolver service
Just found out bug is reported at Microsoft site that x:Reference fails in case Target is Label. However, i couldn't reproduce this issue at my end since i have WPF 4.5 installed at my end and i guess they have fixed the issue in future version.
In case you target WPF 4.0, i would advise you to use TextBlock in place of Label:
<TextBlock Text="9898980001" Height="28" HorizontalAlignment="Left"
Margin="1733,231,0,0" Name="lbl02scanning" VerticalAlignment="Top"
Foreground="Blue" />
and then bind with Text property instead of Content.
Text="{Binding Source={x:Reference lbl02scanning}, Path=Text,
ConverterParameter=255,
Converter={StaticResource FormatterFOrCoilToolTip}}"/>
Either, you can refer to workaround provide under workarounds section here.
You can override the ProvideValue method of the Reference class and skip the reference search login in design time:
[ContentProperty("Name")]
public class Reference : System.Windows.Markup.Reference
{
public Reference()
: base()
{ }
public Reference(string name)
: base(name)
{ }
public override object ProvideValue(IServiceProvider serviceProvider)
{
IProvideValueTarget valueTargetProvider = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
if (valueTargetProvider != null)
{
DependencyObject targetObject = valueTargetProvider.TargetObject as DependencyObject;
if (targetObject != null && DesignerProperties.GetIsInDesignMode(targetObject))
{
return null;
}
}
return base.ProvideValue(serviceProvider);
}
Update with another workaround
This will work for all versions WPF 3.5, WPf 4.0 and WPF 4.5.
First of all bind Image Tag with content of label.
Second host your stackPanel inside ToolTip control so that you can
take benefit of PlacementTarget property.
Third bind with PlacementTarget.Tag of Tooltip.
Relevant code will look like this:
<Image Tag="{Binding ElementName=lbl02scanning,Path=Content}">
<Image.ToolTip>
<ToolTip>
<TextBlock Text="{Binding RelativeSource={RelativeSource
Mode=FindAncestor, AncestorType=ToolTip},
Path=PlacementTarget.Tag,
ConverterParameter=255,
Converter={StaticResource FormatterFOrCoilToolTip}}"/>
</ToolTip>
</Image.ToolTip>
</Image>
Also you need to update converter code to put null check over there since PlacementTarget will be null until you open tooltip.
public object Convert(object value, Type targetType,
object parameter, CultureInfo culture)
{
if (value != null)
{
if (parameter.ToString() == "02")
{
return value.ToString() + " Starting";
}
else
{
return value.ToString() + " Finishing";
}
}
return String.Empty;
}
Try This
Text="{Binding Path=Content,ElementName=lbl02scanning, ConverterParameter=255, Converter={StaticResource FormatterFOrCoilToolTip}}
I have a Data Grid. Its Item source is set to a List. My problem is that Iam unable to apply string formatting . This is formats Ive tried . Am I missing some thing ?
StringFormat='MM/dd/yyyy'
StringFormat={0:dd-MMM-yyyy}
Attached the resultant grid
<sdk:DataGridTemplateColumn Header="Recieved Date" Width="Auto" >
<sdk:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=RecievedDate, StringFormat=\{0:dd-MMM-yyyy\} }" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellTemplate>
<sdk:DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<sdk:DatePicker Name="dtpFinancialAndComplianceLog" Text="{Binding Path=RecievedDate,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellEditingTemplate>
</sdk:DataGridTemplateColumn>
If I understand what you're trying to do correctly, you have a DataGrid column which you want to display a DateTime object in a certain format. Ordinarily a DateTime object will sort out its own formatting depending on the System.Threading.Thread.CurrentUICulture.
Easiest way I know of to force any object into a certain format is to use a custom IValueConverter:
namespace MyProject.Converters
{
public class FormatConverter : IValueConverter
{//Suitable only for read-only data
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null)
return string.Empty;
if(string.IsNullOrEmpty(parameter.ToString()))
return value.ToString();
return string.Format(culture, parameter.ToString(), value);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
}
After adding a namespace to your xaml: xmlns:conv="clr-namespace:MyProject.Converters" and declaring your converter in the control's resources <conv:FormatConverter x:Key="Formatter" />, you will need to bind your column's data using your new converter:
<TextBlock Text="{Binding Path=RecievedDate, Converter={StaticResource Formatter}, ConverterParameter=\{0:dd-MMM-yyy\} }" />
I am looking to get a specific behavior on TextBlock so that its height only includes the height of the capital letters (from baseline to top minus "ascender height"). Please see the image Sphinx from Wikipedia to see what I mean. Also the image below may indicate better what I am after.
I am not specifically looking for a pure XAML solution (probably impossible) so a C# code behind (a converter) is also fine.
This is the XAML used in XamlPad to produce the left A in the image above.
<TextBlock Text="A" Background="Aquamarine" FontSize="120" HorizontalAlignment="Center" VerticalAlignment="Center" />
u can try to use attribute LineStackingStrategy="BlockLineHeight" and a Converter on the LineHeight attributes and a converter on the Height of TextBlock.
This a sample code of converters
// Height Converter
public class FontSizeToHeightConverter : IValueConverter
{
public static double COEFF = 0.715;
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return (double)value * COEFF;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
// LineHeightConverter
public class FontSizeToLineHeightConverter : IValueConverter
{
public static double COEFF = 0.875;
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return double.Parse(value.ToString()) * COEFF;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
The Coefficient used on converters depends on Used Family Fonts (Baseline and LineSpacing):
<TextBlock Text="ABC" Background="Aqua" LineStackingStrategy="BlockLineHeight"
FontSize="{Binding ElementName=textBox1, Path=Text}"
FontFamily="{Binding ElementName=listFonts, Path=SelectedItem}"
Height="{Binding RelativeSource={RelativeSource Self}, Path=FontSize, Mode=OneWay, Converter={StaticResource FontSizeToHeightConverter1}}"
LineHeight="{Binding RelativeSource={RelativeSource Self}, Path=FontSize, Converter={StaticResource FontSizeToLineHeightConverter}}"/>
The best solution is to find how to calculate the Coeff based on parameters Baseline and LineSpacing of the FontFamily.
In this sample (Segeo UI) the Coeff of Height = 0.715 and LineHeight = 0,875 * FontSize.
Updated:
If I understand right, there's a few tricks I know for this,
You can Scale it with RenderTransform which is usually the most efficient way;
<TextBlock Text="Blah">
<TextBlock.RenderTransform>
<CompositeTransform ScaleY="3"/>
</TextBlock.RenderTransform>
</TextBlock>
Or you can embed the TextBlock in a Viewbox to "zoom" the text to fit the bounds of its container if for example you set hard height values on grid rows like;
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="120"/>
<RowDefinition Height="120"/>
</Grid.RowDefinitions>
<Viewbox VerticalAlignment="Stretch" Height="Auto">
<!-- The textblock and its contents are
stretched to fill its parent -->
<TextBlock Text="Sphinx" />
</Viewbox>
<Viewbox Grid.Row="2" VerticalAlignment="Stretch" Height="Auto">
<!-- The textblock and its contents are
stretched to fill its parent -->
<TextBlock Text="Sphinx2" />
</Viewbox>
or you can bind the FontSize to a Container element like;
<Grid x:Name="MyText" Height="120">
<TextBlock FontSize="{Binding ElementName=MyText, Path=Height}" Text="Sphinx" />
</Grid>
They might present the effect you're after?