EDN: ESRI Developer Network
Provides access to members that control the balloon callout.
BalloonCallouts are a filled background that is placed behind text. Use the Style property to select from three different shapes for the balloon. Use the Symbol property to specify the fill symbol used as the background. Use the ICallout and the ITextMargins interfaces to set additional properties for IBalloonCallouts.
| Description | ||
|---|---|---|
 |
AnchorPoint | The anchor point. |
|
LeaderTolerance | The closest distance to the text the anchor point can be for the callout to draw. |
|
Style | The balloon callout style. |
 |
Symbol | The fill symbol. |
| Interfaces | Description |
|---|---|
| ICallout | Provides access to members that control the callout. |
| CoClasses and Classes | Description |
|---|---|
| BalloonCallout | A filled background that is placed behind text. |
The following function shows how to update properties of a balloon callout. You must pass in a reference to a TextSymbol.
Private Function Update(ByVal pFormattedTextSymbol As IFormattedTextSymbol) As ITextSymbol
Dim pTextBackground As ITextBackground
Set pTextBackground = pFormattedTextSymbol.Background
If pTextBackground Is Nothing Then
'then there is not a text symbol background
Set Update = pFormattedTextSymbol
Exit Function
End If
If TypeOf pTextBackground Is IBalloonCallout Then
Dim pBalloonCallout As IBalloonCallout
Set pBalloonCallout = pTextBackground
pBalloonCallout.Style = esriBCSRoundedRectangle
Dim pFillSymbol As IFillSymbol
Set pFillSymbol = New SimpleFillSymbol
pFillSymbol.Color.RGB = 41156607 'a nice yellow color
Set pBalloonCallout.Symbol = pFillSymbol
Set pFormattedTextSymbol.Background = pBalloonCallout
Set Update = pFormattedTextSymbol
Else 'backgroud is not a balloon callout
Set Update = pFormattedTextSymbol
End If
End Function
ISimpleLineCallout Interface | ILineCallout Interface | ICallout Interface | IBalloonCallout Interface
Send feedback on this page