re: Bindable Run

text — Tue, 13 Apr 2010 21:26:54 GMT

Po-

Short answer…

This example doesn’t really show justification. That is a byproduct of how the Run is doing linebreaking.

Long answer…

When reexamining the code snippet, I realize that I could have more clearly conveyed the advantages of a BindableRun. The purpose of this example was to show a scenario when one would like data bound content in the midst of static content. Imagine a report where each page has a footer which reads, “this is the ___ page of this report.” In previous versions of the framework, the only way to do this would be to use a databound TextBlock. If the stars are aligned and the space provided for your footer is perfect, the text spacing may come out correct. In the majority of cases, due to the behavior of TextBlock and Run, the output will look very bad. The correct way to accomplish this would to be use three runs where one is databound. This is now possible in WPF4. I have included updated sample code so that you can play with it and see some of the spacing issues I briefly mentioned.

<Window x:Class="TextBlogDWriteDemo.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1">

<Window.Resources>

<TextBox x:Key="DataStore1" Text="how text does not

flow correctly"/>

<TextBox x:Key="DataStore2" Text="This is an example

of how text flows correctly when only

using bound Runs"/>

</Window.Resources>

<TextBlock Text="{Binding Source=

{StaticResource DataStore1},

Path=Text}"/>

<Run Text="when using a combination of Runs

and TextBlock"/>

</Paragraph>

<Run Text="{Binding Source={StaticResource

DataStore3}, Path=Text}"/>

</Paragraph>

</FlowDocument>

</Window>

re: Bindable Run

PO — Mon, 12 Apr 2010 19:32:28 GMT

The first paragraph in the sample shows a space justification. Who does the line breaking, <Run/> or <TextBlock/>?

re: Bindable Run

Cole — Wed, 28 Oct 2009 10:27:04 GMT

This is great news. I ended up resorting to 'binding' with xslt for FlowDocument stuff previously so this is a huge improvement. Thanks for listening to your customers on this one!

re: Bindable Run

Joe White — Tue, 27 Oct 2009 22:09:20 GMT

Sweet! I never liked having to dig out the homebrew code whenever I start playing around with a new project.