如何：定位 ToolTip
此示例显示如何指定工具提示在屏幕上的位置。
示例
可以使用在 ToolTip 和 ToolTipService 类中定义的五个属性集来定位工具提示。 下表显示这两组五个属性，并根据类提供指向其参考文档的链接。
根据类对应的工具提示属性
如果使用 ToolTip 对象定义工具提示的内容，则可以使用任一类的属性；但是，ToolTipService 属性优先。 对于未定义为 ToolTip 对象的工具提示，请使用 ToolTipService 属性。
下图显示如何使用这些属性定位工具提示。 虽然这些图中的 Extensible Application Markup Language (XAML) 示例显示了如何设置由 ToolTip 类定义的属性，但 ToolTipService 类的相应属性遵循相同的布局规则。 有关 Placement 属性的可能值的详细信息，请参阅 Popup 放置行为。
下图显示使用 Placement 属性放置工具提示：
下图显示使用 Placement 和 PlacementRectangle 属性放置工具提示：
下图显示使用 Placement、PlacementRectangle 和 Offset 属性放置工具提示：
以下示例显示如何使用 ToolTip 属性指定其内容为 ToolTip 对象的工具提示的位置。
<Ellipse Height="25" Width="50"
Fill="Gray"
HorizontalAlignment="Left"
ToolTipService.InitialShowDelay="1000"
ToolTipService.ShowDuration="7000"
ToolTipService.BetweenShowDelay="2000">
<Ellipse.ToolTip>
<ToolTip Placement="Right"
PlacementRectangle="50,0,0,0"
HorizontalOffset="10"
VerticalOffset="20"
HasDropShadow="false"
Opened="whenToolTipOpens"
Closed="whenToolTipCloses"
>
<BulletDecorator>
<BulletDecorator.Bullet>
<Ellipse Height="10" Width="20" Fill="Blue"/>
</BulletDecorator.Bullet>
<TextBlock>Uses the ToolTip Class</TextBlock>
</BulletDecorator>
</ToolTip>
</Ellipse.ToolTip>
</Ellipse>
//Create an ellipse that will have a
//ToolTip control.
Ellipse ellipse1 = new Ellipse();
ellipse1.Height = 25;
ellipse1.Width = 50;
ellipse1.Fill = Brushes.Gray;
ellipse1.HorizontalAlignment = HorizontalAlignment.Left;
//Create a tooltip and set its position.
ToolTip tooltip = new ToolTip();
tooltip.Placement = PlacementMode.Right;
tooltip.PlacementRectangle = new Rect(50, 0, 0, 0);
tooltip.HorizontalOffset = 10;
tooltip.VerticalOffset = 20;
//Create BulletDecorator and set it
//as the tooltip content.
BulletDecorator bdec = new BulletDecorator();
Ellipse littleEllipse = new Ellipse();
littleEllipse.Height = 10;
littleEllipse.Width = 20;
littleEllipse.Fill = Brushes.Blue;
bdec.Bullet = littleEllipse;
TextBlock tipText = new TextBlock();
tipText.Text = "Uses the ToolTip class";
bdec.Child = tipText;
tooltip.Content = bdec;
//set tooltip on ellipse
ellipse1.ToolTip = tooltip;
'Create an ellipse that will have a
'ToolTip control.
Dim ellipse1 As New Ellipse()
ellipse1.Height = 25
ellipse1.Width = 50
ellipse1.Fill = Brushes.Gray
ellipse1.HorizontalAlignment = HorizontalAlignment.Left
'Create a tooltip and set its position.
Dim tooltip As New ToolTip()
tooltip.Placement = PlacementMode.Right
tooltip.PlacementRectangle = New Rect(50, 0, 0, 0)
tooltip.HorizontalOffset = 10
tooltip.VerticalOffset = 20
'Create BulletDecorator and set it
'as the tooltip content.
Dim bdec As New BulletDecorator()
Dim littleEllipse As New Ellipse()
littleEllipse.Height = 10
littleEllipse.Width = 20
littleEllipse.Fill = Brushes.Blue
bdec.Bullet = littleEllipse
Dim tipText As New TextBlock()
tipText.Text = "Uses the ToolTip class"
bdec.Child = tipText
tooltip.Content = bdec
'set tooltip on ellipse
ellipse1.ToolTip = tooltip
以下示例显示如何使用 ToolTipService 属性指定其内容并非 ToolTip 对象的工具提示的位置。
<Ellipse Height="25" Width="50"
Fill="Gray"
HorizontalAlignment="Left"
ToolTipService.InitialShowDelay="1000"
ToolTipService.ShowDuration="7000"
ToolTipService.BetweenShowDelay="2000"
ToolTipService.Placement="Right"
ToolTipService.PlacementRectangle="50,0,0,0"
ToolTipService.HorizontalOffset="10"
ToolTipService.VerticalOffset="20"
ToolTipService.HasDropShadow="false"
ToolTipService.ShowOnDisabled="true"
ToolTipService.IsEnabled="true"
ToolTipOpening="whenToolTipOpens"
ToolTipClosing="whenToolTipCloses"
>
<Ellipse.ToolTip>
<BulletDecorator>
<BulletDecorator.Bullet>
<Ellipse Height="10" Width="20" Fill="Blue"/>
</BulletDecorator.Bullet>
<TextBlock>Uses the ToolTipService class</TextBlock>
</BulletDecorator>
</Ellipse.ToolTip>
</Ellipse>
//Create and Ellipse with the BulletDecorator as
//the tooltip
Ellipse ellipse2 = new Ellipse();
ellipse2.Name = "ellipse2";
this.RegisterName(ellipse2.Name, ellipse2);
ellipse2.Height = 25;
ellipse2.Width = 50;
ellipse2.Fill = Brushes.Gray;
ellipse2.HorizontalAlignment = HorizontalAlignment.Left;
//set tooltip timing
ToolTipService.SetInitialShowDelay(ellipse2, 1000);
ToolTipService.SetBetweenShowDelay(ellipse2, 2000);
ToolTipService.SetShowDuration(ellipse2, 7000);
//set tooltip placement
ToolTipService.SetPlacement(ellipse2, PlacementMode.Right);
ToolTipService.SetPlacementRectangle(ellipse2,
new Rect(50, 0, 0, 0));
ToolTipService.SetHorizontalOffset(ellipse2, 10.0);
ToolTipService.SetVerticalOffset(ellipse2, 20.0);
ToolTipService.SetHasDropShadow(ellipse2, false);
ToolTipService.SetIsEnabled(ellipse2, true);
ToolTipService.SetShowOnDisabled(ellipse2, true);
ellipse2.AddHandler(ToolTipService.ToolTipOpeningEvent,
new RoutedEventHandler(whenToolTipOpens));
ellipse2.AddHandler(ToolTipService.ToolTipClosingEvent,
new RoutedEventHandler(whenToolTipCloses));
//define tooltip content
BulletDecorator bdec2 = new BulletDecorator();
Ellipse littleEllipse2 = new Ellipse();
littleEllipse2.Height = 10;
littleEllipse2.Width = 20;
littleEllipse2.Fill = Brushes.Blue;
bdec2.Bullet = littleEllipse2;
TextBlock tipText2 = new TextBlock();
tipText2.Text = "Uses the ToolTipService class";
bdec2.Child = tipText2;
ToolTipService.SetToolTip(ellipse2, bdec2);
stackPanel_1_2.Children.Add(ellipse2);
'Create and Ellipse with the BulletDecorator as
'the tooltip
Dim ellipse2 As New Ellipse()
ellipse2.Name = "ellipse2"
Me.RegisterName(ellipse2.Name, ellipse2)
ellipse2.Height = 25
ellipse2.Width = 50
ellipse2.Fill = Brushes.Gray
ellipse2.HorizontalAlignment = HorizontalAlignment.Left
'set tooltip timing
ToolTipService.SetInitialShowDelay(ellipse2, 1000)
ToolTipService.SetBetweenShowDelay(ellipse2, 2000)
ToolTipService.SetShowDuration(ellipse2, 7000)
'set tooltip placement
ToolTipService.SetPlacement(ellipse2, PlacementMode.Right)
ToolTipService.SetPlacementRectangle(ellipse2, New Rect(50, 0, 0, 0))
ToolTipService.SetHorizontalOffset(ellipse2, 10.0)
ToolTipService.SetVerticalOffset(ellipse2, 20.0)
ToolTipService.SetHasDropShadow(ellipse2, False)
ToolTipService.SetIsEnabled(ellipse2, True)
ToolTipService.SetShowOnDisabled(ellipse2, True)
ellipse2.AddHandler(ToolTipService.ToolTipOpeningEvent, New RoutedEventHandler(AddressOf whenToolTipOpens))
ellipse2.AddHandler(ToolTipService.ToolTipClosingEvent, New RoutedEventHandler(AddressOf whenToolTipCloses))
'define tooltip content
Dim bdec2 As New BulletDecorator()
Dim littleEllipse2 As New Ellipse()
littleEllipse2.Height = 10
littleEllipse2.Width = 20
littleEllipse2.Fill = Brushes.Blue
bdec2.Bullet = littleEllipse2
Dim tipText2 As New TextBlock()
tipText2.Text = "Uses the ToolTipService class"
bdec2.Child = tipText2
ToolTipService.SetToolTip(ellipse2, bdec2)
stackPanel_1_2.Children.Add(ellipse2)
