Displaying FontFamily in Combobox
- by Torsten
Hi.
My goal is to manipulate the text-styles of my application via DependencyProperties. I got a diagram in which the texts are to be manipulated in size, fontfamily, color, etc. So I'd like to use an interface similar to a rich text editor like Word.
I'm using this code in my TextStyleVM http://shevaspace.blogspot.com/2006/12/i-have-some-fun-with-formattedtext_14.html
So I have a FontFamilyProperty and a Getter and Setter for it:
public static DependencyProperty FontFamilyProperty =
DependencyProperty.Register(
"FontFamily",
typeof(FontFamily),
typeof(OutlinedText),
new FrameworkPropertyMetadata(
SystemFonts.MessageFontFamily,
FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.AffectsMeasure),
new ValidateValueCallback(IsValidFontFamily));
public FontFamily FontFamily
{
get { return (FontFamily)base.GetValue(FontFamilyProperty); }
set { base.SetValue(FontFamilyProperty, value); }
}
Then there is a ToStyle method, which sets the style for the labels of the diagram, which are to be manipulated:
Style style = new Style();
Binding fontFamilyBinding = new Binding("FontFamily");
fontFamilyBinding.Source = this;
Setter fontFamilySetter = new Setter();
fontFamilySetter.Property = TextBlock.FontFamilyProperty;
fontFamilySetter.Value = fontFamilyBinding;
style.Setters.Add(fontFamilySetter);
return style;
Now this works for a TextBox. The textbox displays the current FontFamily, and if I enter a new, valid FontFamily like Arial into the textbox the FontFamily of the labels are changed.
However, what I'd like to have is a combobox, which displays the SystemFonts and where I can choose one FontFamily for my labels. However, the binding doesn't seem to work. Neither the system fonts nor the current fonts of the labels are displayed. The combobox is just empty.
This is my xaml:
<r:RibbonLabel Content="FontFamily" />
<!--these do not work-->
<r:RibbonComboBox SelectedItem="{Binding FontFamily}"/>
<r:RibbonComboBox ItemsSource="{Binding FontFamily}"/>
<!--this works-->
<r:RibbonTextBox Text="{Binding FontFamily}"/>
Now, I assume I have to set a different Setter for a ComboBox in the ToStyle Method. But I have no clue, which one. Maybe someting like this:
fontFamilySetter.Property = ComboBox.ItemSource;
However, if I set that Property, the TextBox still works. So is this the wrong place to start at? I'd also be grateful if someone could hint me to some documentation about using these Style-, Setter-, Binding-key-words, which are used in the ToStyle method, since this is somebody elses code I'm working with.
