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pianoboy11
1285
Create common context menu in WPF
posted

This is more of a general WPF question than your controls, I tried posting on Expert Exchange and Stack Overflow without any success.  So I thought you might be able to help.

n my app I have many grids (Infragistics). I would like to create a context menu that will implement many of the common functions ie: delete, save layout, etc. and if a specific grid needs more than the common functions be able to add to the menu for that grid. I would like to create one context menu and not have to repeat the same code throughout project.

I have no idea on how to accomplish this. Possible? Example xaml and/or code will be helpful.

Thanks a bunch,

Rick

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  • 9694
    posted

    I believe the best approach to this would be to define one ContextMenu and assign it to the layout that contains all the instances of the XamDataGrid you wish to effect. This global contextual menu would change what it shows based on which element is clicked on. If you need to keep it from opening, you can override the Right Mouse Down event and control the opening of the ContextMenu programmatically.

    Here are a couple of URLs to websites that show how to use the ContextMenu in such specialized ways:

    http://www.wpftutorial.net/ContextMenu.html

    http://stackoverflow.com/questions/2071932/how-to-add-condition-to-a-wpf-context-menu

  • 1285
    Verified Answer
    posted in reply to [Infragistics] Curtis Taylor

    Here is my solution I came up with:

    I created  a resource dictionary with code behind to hold my context menu (http://stackoverflow.com/questions/92100/is-it-possible-to-set-code-behind-a-resource-dictionary-in-wpf-for-event-handling):
    <

    resourcedictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"><ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                       xmlns:sys="clr-namespace:System;assembly=mscorlib"
                       x:Class="DCS.CAPPS.ResourceDictionaries.GridContextMenu"
                       x:ClassModifier="public">
       <x:Array Type="{x:Type sys:Object}" x:Key="GridContextMenu">
           <MenuItem Header="Test" Name="Test" Click="Test_Click"/>
       </x:Array>
    </ResourceDictionary>

    GRID:
    <igDP:XamDataGrid.ContextMenu>
                               <ContextMenu Opened="ContextMenu_Opened">
                                   <ContextMenu.ItemsSource>
                                       <CompositeCollection>
                                           <CollectionContainer Collection="{StaticResource GridContextMenu}"/>
                                       </CompositeCollection>
                                   </ContextMenu.ItemsSource>
                               </ContextMenu>
                           </igDP:XamDataGrid.ContextMenu><igDP:XamDataGrid.ContextMenu>
                               <ContextMenu Opened="ContextMenu_Opened">
                                   <ContextMenu.ItemsSource>
                                       <CompositeCollection>
                                           <CollectionContainer Collection="{StaticResource GridContextMenu}"/>
                                       </CompositeCollection>
                                   </ContextMenu.ItemsSource>
                               </ContextMenu>
                           </igDP:XamDataGrid.ContextMenu>

    To get the to the grid in the event handler I needed to do this in the context opened handler:
    private void ContextMenu_Opened(object sender, RoutedEventArgs e)
           {
               ContextMenu c = sender as ContextMenu;
               CompositeCollection col = c.ItemsSource as CompositeCollection;
               CollectionContainer col2 = col[0] as CollectionContainer;

               foreach (object item in col2.Collection)
               {
                   MenuItem m = item as MenuItem;
                   if (m != null)
                   {
                       m.CommandParameter = c;
                   }
               }
           }
    And in the click handler in the resource code:
    private void Test_Click(object sender, RoutedEventArgs e)
           {
               MenuItem mi = sender as MenuItem;
               ContextMenu cm = mi.CommandParameter as ContextMenu;
               XamDataGrid grid = cm.PlacementTarget as XamDataGrid;

               if (grid != null)
                   MessageBox.Show("Works");
               else
                   MessageBox.Show("Does Not work");
           }
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