?
Solved

Dynamically changing properties in XAML such as Width, FontSize, etc for a TextBox

Posted on 2010-11-30
4
Medium Priority
?
820 Views
Last Modified: 2012-05-10
Hi All,

I am working on my Visual aspect of my controls right now. I am trying to dynamically change certain properties on the MouseOver and IsFocused ControlTemplate triggers of a TextBox.

I want to change the Width to the Current TextBox Width + 10 and FontSize to Current TextBox FontSize + 2 when the MouseOver trigger is True.

I can not figure out a way to do this in XAML.

I know how to do this easily in C#, but I am trying to keep all of this code in XAML.

How do I do this in a trigger????

<Setter Property="Width" Value="Width+20" />

Thanks in advance.
<Style x:Key="bhTextBoxStyle" x:Name ="bh1" TargetType="{x:Type BH:bh_TextBox}">
        <Setter Property="SnapsToDevicePixels"
            Value="True" />
        <Setter Property="OverridesDefaultStyle"
            Value="True" />
        <Setter Property="KeyboardNavigation.TabNavigation"
            Value="None" />
        <Setter Property="FocusVisualStyle"
            Value="{x:Null}" />
        <Setter Property="FontSize" Value="{DynamicResource bh_TextBoxFontSize}" />
        <Setter Property="Foreground" Value="{DynamicResource bh_ControlOffBlack}" />
        <Setter Property="Padding" Value="2,5" />
        <Setter Property="IsTabStop" Value="True" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="MinWidth"
            Value="1" />
        <Setter Property="MinHeight"
            Value="20" />
        <Setter Property="AllowDrop"
            Value="true" />
        <Setter Property="HorizontalContentAlignment" Value="Left" />

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate x:Name="bh_ct_textbox" TargetType="{x:Type BH:bh_TextBox}">
                    <Border Name="Border"
                  CornerRadius="10"
                  Padding="0"
                  BorderThickness="1"
                  Background ="{DynamicResource bh_TextBoxBrush}"
                  BorderBrush="{DynamicResource bh_TextBoxBorderBrush}">

                        <my:VisualStateManager.VisualStateGroups>
                            <my:VisualStateGroup x:Name="CommonStates">
                                <my:VisualState x:Name="Normal" />
                                <my:VisualState x:Name="Disabled">
                                    <Storyboard>

                                    </Storyboard>
                                </my:VisualState>
                                <my:VisualState x:Name="ReadOnly">
                                    <Storyboard>
                                    </Storyboard>

                                </my:VisualState>
                                <my:VisualState x:Name="MouseOver">
                                  <Storyboard Name="TextBoxFade" AutoReverse="False">
                                    <DoubleAnimation  Name="TextBoxFadeAnimation"
                                            Storyboard.TargetName="Border" 
                                            Storyboard.TargetProperty="(Border.Opacity)"
                                            From="0.4" To="1.0" Duration="0:0:1" 
                                            AutoReverse="False" RepeatBehavior="1x" 
                                         />
                                    </Storyboard>
                                </my:VisualState>
                            </my:VisualStateGroup>
                        </my:VisualStateManager.VisualStateGroups>
                        <ScrollViewer Margin="0"
                          x:Name="PART_ContentHost" />
                    </Border>
                    
                    <ControlTemplate.Triggers>
   
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName ="Border" Property="BorderBrush" Value="{DynamicResource bh_MouseOverBorderBrush}" />
                            <Setter TargetName="Border" Property="BorderThickness" Value="3" />
                            <Setter Property="Width" Value="100" />
                            <Setter Property="FontSize" Value="{DynamicResource bh_TextBoxMouseOverFontSize}" />
                            <Setter Property="Padding" Value="2,1" />
                        </Trigger>

Open in new window

0
Comment
Question by:HOLLYWUB
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 6

Expert Comment

by:ventaur
ID: 34239368
There is no built-in way to handle expressions in your binding markup. I suggest you use the custom LambdaConverter to accomplish expression handling in your XAML.

Then, setup a resource (perhaps with a Key of "addtion") using the LambdaConverter with an expression of "value+parameter". Finally, your binding should use TemplateBinding to get at the control's own Width property.

<Window ...
  xmlns:XamlConverter="clr-namespace:XamlConverter;assembly=XamlConverter"
  ...>
  <Window.Resources>
    <XamlConverter:LambdaConverter x:Key="addition">value+parameter</XamlConverter:LambdaConverter>
  </Window.Resources>

...
  <Setter Property="Width" Value="{TemplateBinding Property=Width, Converter={StaticResource addition}, ConverterParameter='10'}" />
...

Open in new window

0
 

Author Comment

by:HOLLYWUB
ID: 34251077
Hi Ventaur,

I am getting an Assembly not found error for XamlConverter.

What reference do I need to add to my project for the XamlConverter?

0
 
LVL 6

Accepted Solution

by:
ventaur earned 1000 total points
ID: 34252578
Please, note that I have not used the LambdaConverter myself. That said, the home page for the project mentions needing the Dynamic.cs file from some samples included with VS 2008 or the provided download link. It sounds like you should include that source file and the LamdaConverter.cs source file in your project somewhere in order to get all this working.
0
 

Author Closing Comment

by:HOLLYWUB
ID: 34375107
The expert did not actually try this solution first. It didn't work. I went another route after searching other FREE knowledge bases.

I was very surprised I did not get a qualified soluition for this question.
0

Featured Post

Understanding Linux Permissions

Linux for beginners: How to view the permissions associated with files and directories and also how you can change them.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

IP addresses can be stored in a database in any of several ways.  These ways may vary based on the volume of the data.  I was dealing with quite a large amount of data for user authentication purpose, and needed a way to minimize the storage.   …
Summary Displaying images in RichTextBox is a common requirement with limited solutions available. Pasting through clipboard or embedding into RTF content only support static images.  This article describes how to insert Windows control objects int…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Suggested Courses

765 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question