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Waterfiets
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Contextmenu questions
Dec 17th, 2013 at 2:01pm
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Hi Stoyan,

In our application i'm using an Contextmenu to edit some node values. After a while i wanted to change the look of the contextmenu by changing the color so it would fit the design of our modeler. Well, it did change the color but not of the whole context menu. There seems to be some sort of 'strip' on the left side of the menu which seems to keep the original color.

What i want to do is either remove the part on the left, which seems reserved for icons, or change the color of the 'strip' so it doesn't interfere with the look.

Could you give any information on why this is happening and how i can fix it?

Thanks in advance.

Greets,

Sander
  
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Stoyo
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Re: Contextmenu questions
Reply #1 - Dec 17th, 2013 at 3:09pm
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Hi,

It seems you'll have to modify menu's Xaml template to edit that color:
http://social.msdn.microsoft.com/Forums/vstudio/en-US/23bc2e08-d220-4e21-bd08-4a...

I hope that helps,
Stoyan
  
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Waterfiets
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Re: Contextmenu questions
Reply #2 - Dec 17th, 2013 at 3:11pm
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Hi Stoyan,

Ah, you probably had better search criteria then i had. Thanks for the info, atleast i know its possible:)

Greets,

Sander
  
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Waterfiets
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Re: Contextmenu questions
Reply #3 - Dec 19th, 2013 at 11:19am
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Hi Stoyan,

Thanks to your suggestion i was able to make a template for my custom Contextmenu in a WPF based testproject and it worked out pretty nice. Now i wanted to apply this to the main project which is a wf project that hosts the Mindfusion wpf project.

The problem i encountered is that once i set the style of my MenuItem to Application.Current.Resources[MenuItemStyle] as Style; Which refers to my xaml in the code below. I get an error. Do you perhaps have any tips on how to solve this?

Code
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 <Application x:Class="TSFBRModeler.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="BRModeler.xaml">
    <Application.Resources>
            <Style TargetType="{x:Type MenuItem}" x:Key="MenuItemStyle">
                <Setter Property="Background" Value="Gray"></Setter>
                <Setter Property="Foreground" Value="White"></Setter>
                <Setter Property="FontSize" Value="13"></Setter>
                <Setter Property="FontFamily" Value="Verdana"></Setter>
                <Setter Property="Margin" Value="-5,0,0,0"></Setter>
                <Style.Triggers>
                    <Trigger Property="IsHighlighted" Value="True">
                        <Setter Property="Background" Value="Black"></Setter>
                        <Setter Property="FontSize" Value="15"></Setter>
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="Foreground" Value="LightGray"></Setter>
                    </Trigger>
                </Style.Triggers>
            </Style>
    </Application.Resources>
</Application>



Greets,

Sander
  
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Stoyo
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Re: Contextmenu questions
Reply #4 - Dec 19th, 2013 at 1:57pm
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What kind of error are you getting?
  
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Waterfiets
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Re: Contextmenu questions
Reply #5 - Dec 20th, 2013 at 7:33am
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Well i assume the problem is that WF doesnt have application wide resources, i.e. App.xaml. Which means i cant reach the file which contains the information about the template. Anyhows, i found a workaround, i made the template programmatically instead of using the xaml. Thanks anyway:D
  
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Stoyo
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Re: Contextmenu questions
Reply #6 - Dec 20th, 2013 at 8:01am
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Well, it works without any errors in my test, with your exact Xaml copied to App.xaml:

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if (e.MouseButton == MouseButton.Right)
{
	var menu = new ContextMenu();
	var item = new MenuItem();
	item.Header = "that's me";
	item.Style = (System.Windows.Style)Application.Current.Resources["MenuItemStyle"];
	menu.Items.Add(item);
	menu.IsOpen = true;
	return;
}


I hope that helps,
Stoyan
  
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Waterfiets
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Re: Contextmenu questions
Reply #7 - Jan 8th, 2014 at 10:30am
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Hi,

This is the stacktrace of the error i get:

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   at TSFBRModeler.TSFBRDiagramNodes.TSFBRContextNodes.BRSetActiveTabNode.Draw(DrawingContext graphics, RenderOptions options) in c:\Users\sleune\trunk_bsr\TSFBRModeler\TSFBRDiagramNodes\TSFBRContextNodes\BRSetActiveTabNode.cs:line 353
   at MindFusion.Diagramming.Wpf.DiagramItem.OnRender(DrawingContext drawingContext)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at A.A.ArrangeOverride(Size arrangeSize)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)


Maybe you see something i dont. Cool

Edit:

Line 353 = rightField.Style = (System.Windows.Style)Application.Current.Resources["MenuItemStyle"];

Edit:

Extra info: The TSFBRModeler WPF solution is hosted by the WF Solution TSFBRModelerBootStrap. And the startup type of TSFBRModeler is class library.

Would the startupuri then be different?
  
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Stoyo
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Re: Contextmenu questions
Reply #8 - Jan 8th, 2014 at 12:26pm
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What kind of exception is thrown there?
  
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Waterfiets
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Re: Contextmenu questions
Reply #9 - Jan 8th, 2014 at 1:11pm
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It threw an Null Reference exception, i.e. the value of the object was null.
  
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Stoyo
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Re: Contextmenu questions
Reply #10 - Jan 8th, 2014 at 1:36pm
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And it isn't the rightField variable having a null value?
  
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Waterfiets
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Re: Contextmenu questions
Reply #11 - Jan 8th, 2014 at 2:56pm
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Nope, the values are hard coded atm.
  
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Stoyo
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Re: Contextmenu questions
Reply #12 - Jan 8th, 2014 at 3:16pm
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If you add a breakpoint to that Line 353, which one is null when it hits - rightField, Application.Current or Application.Current.Resources?
  
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Waterfiets
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Re: Contextmenu questions
Reply #13 - Jan 8th, 2014 at 3:18pm
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The value of Application.Current is null.
  
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Stoyo
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Re: Contextmenu questions
Reply #14 - Jan 8th, 2014 at 3:25pm
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Code
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static App()
{
	Debug.WriteLine(Application.Current);
}

App()
{
	Debug.WriteLine(Application.Current);
}


This test shows Application.Current is null during static initialization, and is already set in the instance constructor App() (i.e. once the base Application constructor has executed). So I suppose your code runs from a static constructor or initializer of some kind, and apparently you won't be able to access resources then. You should still be able to load the style at a later point.

I hope that helps,
Stoyan
  
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