When I add Controls to a WPF RichTextBox They Are Always Disabled. How can I change that?
WPF FlowDocuments can contain controls like CheckBoxes and
Buttons. When the document is displayed statically and is not editable the
controls are enabled, however in WPF V1 when they are rendered as the content
of a RichTextBox (and the FlowDocument can be edited) the controls are
disabled.
This has not always been the case. During the WPF CTP releases
around beta 1 it was possible
to enable controls inside a FlowDocument contained within a RichTextBox by
setting the IsEnabled property on the FlowDocument to true. As WPF V1
approached the WPF team decided to disable this functionality. Although I don’t
believe I’ve ever seen a reason for this it would be a difficult feature to fully
support.
Fortunately there is a fairly clean work-around, for those
prepared to take the risks associated with using a feature that the product
team has consciously disabled. By inheriting from FlowDocument and over-riding
the protected IsEnabledCore method to return true, and then using this
FlowDocument sub-type inside the RichTextBox you can add enabled controls.
C# Code (WPF V1)
class EnabledFlowDocument : FlowDocument
{
protected override bool IsEnabledCore
{
get
{
return true;
}
}
}
Xaml Code (WPF V1)
<RichTextBox Grid.Column="1">
<!-- sub-class of FlowDocument -->
<my:EnabledFlowDocument FontFamily="Segoe" FontSize="12">
<Paragraph>
This is some text inside a sub-type of flowdocument
</Paragraph>
<BlockUIContainer>
<Button Content="Click Me!" Click="ButtonClicked">
</Button>
</BlockUIContainer>
<Paragraph>
<Hyperlink
NavigateUri="http://learnwpf.com" Click="LinkClicked">
visit LearnWPF.com
</Hyperlink>
</Paragraph>
</my:EnabledFlowDocument>
</RichTextBox>
You can download the source code here
Note: I had to explicitly set the FontFamily and FontSize on
the instance of the sub-type of FlowDocument that I created to match the “default”
appearance of the regular FlowDocument, so a little more work is required to
make this a drop-in replacement for the regular FlowDocument.
I first saw this work-around in
the MSDN forums but have subsequently discovered it has been documented
elsewhere.
Categories:
Comments:
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ContextMenu does not work
posted by
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on
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:
It appears that this workaround has limitations. Try the following code:
<RichTextBox>
<FlowDocument>
<Paragraph>
<Run Background="Yellow" Text="This is text inside a FlowDocument that is inside a RichTextBox. ">
<Run.ToolTip>Example Tool Tip</Run.ToolTip>
<Run.ContextMenu>
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<MenuItem Header="Third Item"/>
</ContextMenu>
</Run.ContextMenu>
</Run>
</Paragraph>
</FlowDocument>
</RichTextBox>
As you will see, the ToolTip and ContextMenu do not work. Interestingly, if this paragraph is added using code, the ToolTip will work but the ContextMenu will not.
I tried overriding the IsEnabledCore on the Paragraph object, Run object and even the ContextMenu object but it did not help.
Does anyone know of any workarounds for this problem?
#
ContextMenu does not work (clarification)
posted by
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on
1/24/2007 12:03:11 AM
:
I think I should clarify that what I was saying was that when using an EnabledFlowDocument (like the one described at the beginning of this blog) the ToolTips work but the ContextMenu does not.
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