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title, ms.date, helpviewer_keywords, ms.assetid
| title | ms.date | helpviewer_keywords | ms.assetid | |
|---|---|---|---|---|
| How to: Create a Style for a Dragged GridView Column Header | 03/30/2017 |
|
0b999645-0313-4b33-80b9-19ece08b5459 |
How to: Create a Style for a Dragged GridView Column Header
This example shows how to change the appearance of a dragged xref:System.Windows.Controls.GridViewColumnHeader when the user changes the position of a column.
Example
When you drag a column header to another location in a xref:System.Windows.Controls.ListView that uses xref:System.Windows.Controls.GridView for its view mode, the column moves to the new position. While you are dragging the column header, a floating copy of the header appears in addition to the original header. A column header in a xref:System.Windows.Controls.GridView is represented by a xref:System.Windows.Controls.GridViewColumnHeader object.
To customize the appearance of both the floating and original headers, you can set xref:System.Windows.Controls.ControlTemplate.Triggers%2A to modify the xref:System.Windows.Controls.GridViewColumnHeader xref:System.Windows.Style. These xref:System.Windows.Controls.ControlTemplate.Triggers%2A are applied when the xref:System.Windows.Controls.Primitives.ButtonBase.IsPressed%2A property value is true and the xref:System.Windows.Controls.GridViewColumnHeader.Role%2A property value is xref:System.Windows.Controls.GridViewColumnHeaderRole.Floating.
When the user presses the mouse button and holds it down while the mouse pauses on the xref:System.Windows.Controls.GridViewColumnHeader, the xref:System.Windows.Controls.Primitives.ButtonBase.IsPressed%2A property value changes to true. Likewise, when the user begins the drag operation, the xref:System.Windows.Controls.GridViewColumnHeader.Role%2A property changes to xref:System.Windows.Controls.GridViewColumnHeaderRole.Floating.
The following example shows how to set xref:System.Windows.Controls.ControlTemplate.Triggers%2A to change the xref:System.Windows.Controls.Control.Foreground%2A and xref:System.Windows.Controls.Control.Background%2A colors of the original and floating headers when the user drags a column to a new position.
[!code-xamlListViewHeaderRoleStyle#GVCHControlTemplateStart]
[!code-xamlListViewHeaderRoleStyle#ControlTemplateTriggersStart]
[!code-xamlListViewHeaderRoleStyle#IsPressed]
[!code-xamlListViewHeaderRoleStyle#Floating]
[!code-xamlListViewHeaderRoleStyle#ControlTemplateTriggersEnd]
[!code-xamlListViewHeaderRoleStyle#GVCHControlTemplateEnd]