In my current Windows Phone 7 app, we want to use two themes: Dark And Light, and we are also using some panoramic and pivot controls in our app. Each control has a different image for each dark and light theme.
For this purpose, I made two separate themes in my project. However, I am unable to load images for the theme. Can anyone please suggest how I can load images from the theme according to whether it is the dark or light version?
If you're only displaying images you can create a ValueConverter to determine the theme:
// Assumes a dark theme image is passed in the parameter variable
public class ImageThemeValueConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if(parameter == null) return null;
Visibility darkBackgroundVisibility =
(Visibility)Application.Current.Resources["PhoneDarkThemeVisibility"];
if (darkBackgroundVisibility == Visibility.Visible)
{
return new Uri(parameter.ToString();
}
else
{
string path = parameter.ToString();
path = System.IO.Path.GetDirectoryName(path) + System.IO.Path.GetFileNameWithoutExtension(path) + ".light"+System.IO.Path.GetExtension(path);
return new Uri(path);
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
and in your xaml:
<Image Source="{Binding Converter={StaticResource ImageThemeValueConverter}, ConverterParameter=Images/ThemeImage.png}"/>
If putting the images in an button and the images only use the background and foreground colors (black and white) you can have a style that will change the color.
<Button Style="{StaticResource PhoneButton}">
<ImageBrush ImageSource="/Images/appbar.save.png" Stretch="None"/>
</Button>
And the style:
<Style TargetType="Button" x:Key="PhoneButton">
<Setter Property="Width" Value="48"/>
<Setter Property="Height" Value="48"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.HorizontalAlignment)" Storyboard.TargetName="ContentContainer">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<HorizontalAlignment>Stretch</HorizontalAlignment>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.VerticalAlignment)" Storyboard.TargetName="ContentContainer">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<VerticalAlignment>Stretch</VerticalAlignment>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ContentContainer">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneBackgroundBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneForegroundBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Stroke" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneForegroundBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ContentContainer">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Stroke" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="Transparent"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid>
<Ellipse x:Name="Border" Fill="{TemplateBinding Background}" Canvas.Left="0" Stretch="Fill"
StrokeThickness="3" StrokeLineJoin="Round" Stroke="{TemplateBinding BorderBrush}"/>
<Grid x:Name="ContentContainer" OpacityMask="{TemplateBinding Content}" Background="{TemplateBinding Foreground}"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
You can use the following code snippet to decide the theme, and set the images accordingly.
if ((double)Application.Current.Resources["PhoneDarkThemeOpacity"] == 1)
{
//Dark Theme
}
else
{
//Light Theme
}
You can also have a look here for more details.
