Solved

Dynamic calculating constants in a Resource Dictionary

Posted on 2008-10-14
2
915 Views
Last Modified: 2013-11-12
Have this Xaml constant (XamlConstants.cs) and it dynamicaly creates other constants from other values:
        #region Fields
        const double ADJUSTMENT = -1;
        const double COL_DELTA = 190;
        const double LBL_TXT_DELTA = 75;
        const double ROW_DELTA = 30;
        const double TXT_CHK_DELTA = 3;
        const double TXT_ROW1 = 2;
        #endregion

        #region Public Constants
        public const double BTN_HEIGHT = 23;
        public const double BTN_WIDTH = 75;
        public const double LBL_HEIGHT = 28;
        public const double LBL_WIDTH = 54;
        public const double LBL_WIDTH_X2 = LBL_WIDTH * 2;
                    :
        public const double ROW_HEIGHT = ROW_DELTA - 1;
        public const double ROW_HEIGHT_X2 = (ROW_DELTA * 2) + ADJUSTMENT;
                    :
        public const double ROW_HEIGHT_X5 = (ROW_DELTA * 5) + ADJUSTMENT;
        public const double TXT_HEIGHT = 21;
        public const double TXT_WIDTH = 90;
        public const double TXT_WIDTH_SMALL = TXT_WIDTH / 2;
        public const double TXT_WIDTH_TINY = TXT_WIDTH_SMALL / 2;
                     :
        public const double TXT_WIDTH_X4 = TXT_WIDTH * 4;
        #endregion

I want to move this to a Resource Dictionary

I'm able to do this:
    <!--    Labels      -->
    <Style TargetType="Label" x:Key="lblBase">
        <Setter Property="Height" Value="28" />
    </Style>
    <Style TargetType="Label"     x:Key="lblStd">
        <Setter Property="Height" Value="{DynamicResource lblBase.Height}" />
        <Setter Property="Width"  Value="54" />
    </Style>
    <Style TargetType="Label"     x:Key="lblStd_X2">
        <Setter Property="Height" Value="{DynamicResource lblBase.Height}" />
        <Setter Property="Width"  Value="108" />

But I want the width of lblStd_X2 to be represented as something like lblStd.Width*2 - How do I do that?

Thanks
0
Comment
Question by:Marvin_Rowe
2 Comments
 
LVL 8

Accepted Solution

by:
adler77 earned 500 total points
ID: 22728308
I know there are more options with WPF, but I am more familiar with the SL side (which should also work in WPF). I haven't tried it, since SL doesn't support DynamicResource, but could you do a value converter (http://www.jeff.wilcox.name/2008/07/13/visibility-type-converter/)?

Similar to the example I linked to, except your value would be "{DynamicResource lblStd.Width, Converter={StaticResource WidthDoubler}}" and then the VisibilityConverter would be set up the same (named WidthDoubler) except Convert would look like the code below:
public object Convert(   

        object value,   

        Type targetType,   

        object parameter,   

        CultureInfo culture)   

    {   

        double stdwidth = (double)value;   

        return stdwidth * 2;   

    }   

Open in new window

0
 

Author Comment

by:Marvin_Rowe
ID: 22729561
Help me understand how this solution is different from using Xaml constants (above), which I was able to do but wanted to move the logic from a Xaml constant to a Resource Dictionary.
0

Featured Post

What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
For most people, the WrapPanel seems like a magic when they switch from WinForms to WPF. Most of us will think that the code that is used to write a control like that would be difficult. However, most of the work is done by the WPF engine, and the W…
It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

747 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

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now