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ToolTip.CustomPopupPlacementCallback Property

Gets or sets the delegate handler method to use to position the ToolTip.

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

[BindableAttribute(false)]
public CustomPopupPlacementCallback CustomPopupPlacementCallback { get; set; }

Property Value

Type: System.Windows.Controls.Primitives.CustomPopupPlacementCallback
The CustomPopupPlacementCallback delegate method that provides placement information for the ToolTip. The default is null.

Identifier field

CustomPopupPlacementCallbackProperty

Metadata properties set to true

None

The Placement property must be set to Custom for the callback delegate to be used.

The CustomPopupPlacementCallback delegate returns an array of possible points that are defined with respect to the PlacementTarget. When the ToolTip is displayed, a point is chosen that maximizes the amount of the ToolTip window that is visible.

The following example shows how to set the CustomPopupPlacementCallback property and create the corresponding delegate. The same technique is used to by the Popup, which is demonstrated in the Popup Placement Sample.

aToolTip.Placement = PlacementMode.Custom;
aToolTip.CustomPopupPlacementCallback =
    new CustomPopupPlacementCallback(placeToolTip);
        public CustomPopupPlacement[] placeToolTip(Size popupSize,
	                                               Size targetSize,
	                                               Point offset)
        {
            CustomPopupPlacement placement1 =
               new CustomPopupPlacement(new Point(-50, 100), PopupPrimaryAxis.Vertical);

            CustomPopupPlacement placement2 =
                new CustomPopupPlacement(new Point(10, 20), PopupPrimaryAxis.Horizontal);

            CustomPopupPlacement[] ttplaces =
                    new CustomPopupPlacement[] { placement1, placement2 };
            return ttplaces;
        }

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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