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CustomPopupPlacementCallback Delegate

Represents a method that provides custom positioning for a Popup control.

Namespace: System.Windows.Controls.Primitives
Assembly: PresentationFramework (in presentationframework.dll)

public delegate CustomPopupPlacement[] CustomPopupPlacementCallback (
	Size popupSize,
	Size targetSize,
	Point offset
)
/** @delegate */
public delegate CustomPopupPlacement[] CustomPopupPlacementCallback (
	Size popupSize, 
	Size targetSize, 
	Point offset
)
In XAML, you can use delegates but you cannot define your own.

Parameters

popupSize

The Size of the Popup control.

targetSize

The Size of the PlacementTarget.

offset

The Point computed from the HorizontalOffset and VerticalOffset property values.

Return Value

An array of possible CustomPopupPlacement positions for the Popup control relative to the PlacementTarget.

Methods that represent instances of this delegate type can be defined for the Popup or ToolTip objects by setting the Popup.CustomPopupPlacementCallback or CustomPopupPlacementCallback properties.

This set of examples shows how to use the placement properties to specify the position of a Popup control.

You can determine the position of a Popup control by using the following properties:

The first four properties define a two-dimensional coordinate on the screen. The fifth property, Placement, positions the Popup and also defines its behavior if its content overlaps the screen boundaries.

Use a PlacementMode enumeration value to set the Placement property. For more information about the enumeration values for PlacementMode, see How to: Use the PlacementMode Enumeration to set Placement.

The following illustrations show how the placement properties work together to position a Popup control.

Popup placement by using the Placement property


Popup placement

Popup placement by using the Placement and PlacementRectangle properties


Popup placement rectangle

Popup placement by using the Placement, PlacementRectangle, and Offset properties


Popup placement diagram

The following example shows how to set these Popup properties. For the complete sample, see Popup Position Sample.

Popup myPopup = new Popup();
myPopup.PlacementTarget = myEllipse;
myPopup.PlacementRectangle = new Rect(0, 0, 30, 50);
myPopup.VerticalOffset = 20;
myPopup.HorizontalOffset = 20;
myPopup.Placement = PlacementMode.Bottom;
myPopup.PopupAnimation = PopupAnimation.Fade;
myPopup.AllowsTransparency = true;
TextBlock popupText = new TextBlock();
popupText.Background = Brushes.Beige;
popupText.FontSize = 12;
popupText.Width = 75;
popupText.TextWrapping = TextWrapping.Wrap;
myPopup.Child = popupText;

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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