頁面設計需求，做了一個氣泡形狀的彈出框，效果如下：
設計思路如下：
1. 使用Path繪制氣泡的尖尖，將這個放到頂層；
2. 在用border繪制長方形框，將這個放到底層，并且設置Margin值，使得Path圖層和border看起來銜接在一起。
代碼如下：
<Window x:Class="BubblePanelTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" <Window.Resources> <Style TargetType="Label" x:Key="TopBubblePanel"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Label}"> <Grid> <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Top" Background="Yellow" HorizontalAlignment="Left" Margin="0,8.5,0,0" Padding="5"> <ContentPresenter /> </Border> <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,0,0,0" Background="Transparent"> <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow"> <Path.Data> <PathGeometry Figures="M 0,10 L 0,10,5,0 L 5,0,10,10 "/> </Path.Data> </Path> </Canvas> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="Label" x:Key="BottomBubblePanel"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Label}"> <Grid> <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Bottom" Margin="0,0,0,8.5" Background="Yellow" HorizontalAlignment="Left" Padding="5"> <ContentPresenter /> </Border> <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,0,0,0" Background="Transparent"> <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow"> <Path.Data> <PathGeometry Figures="M 0,0 L 0,0,5,10 L 5,10,10,0 "/> </Path.Data> </Path> </Canvas> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="Label" x:Key="LeftBubblePanel"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Label}"> <Grid> <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Top" Margin="8.5,0,0,0" Background="Yellow" HorizontalAlignment="Left" Padding="5"> <ContentPresenter /> </Border> <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,10,0,0" Background="Transparent"> <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow"> <Path.Data> <PathGeometry Figures="M 10,0 L 10,0,0,5 L 0,5,10,10 "/> </Path.Data> </Path> </Canvas> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="Label" x:Key="RightBubblePanel"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Label}"> <Grid HorizontalAlignment="Left"> <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,0,8.5,0" Background="Yellow" Padding="5"> <ContentPresenter /> </Border> <Canvas Width="10" Height="10" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,10,0,0" Background="Transparent"> <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow"> <Path.Data> <PathGeometry Figures="M 0,0 L 0,0,10,5 L 10,5,0,10 "/> </Path.Data> </Path> </Canvas> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </Window.Resources> <StackPanel> <Label Style="{StaticResource TopBubblePanel}" Tag="Top" Margin="2"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80"/> </StackPanel> </StackPanel> </Label> <Label Style="{StaticResource BottomBubblePanel}" Tag="Top" Margin="2"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80"/> </StackPanel> </StackPanel> </Label> <Label Style="{StaticResource LeftBubblePanel}" Tag="Top" Margin="2"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80"/> </StackPanel> </StackPanel> </Label> <Label Style="{StaticResource RightBubblePanel}" Tag="Top" Margin="2"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80"/> </StackPanel> </StackPanel> </Label> <StackPanel Orientation="Horizontal" Margin="0,30,0,0"> <Button Name="btnTestPopup1" Width="100" Height="30" Content="Bottom" Click="btnTestPopup1_Click" /> <Button Name="btnTestPopup2" Width="100" Height="30" Content="Top" Click="btnTestPopup2_Click" /> <Button Name="btnTestPopup3" Width="100" Height="30" Content="Right" Click="btnTestPopup3_Click" /> <Button Name="btnTestPopup4" Width="100" Height="30" Content="Left" Click="btnTestPopup4_Click" /> </StackPanel> <Popup Name="pop1" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Slide" PlacementTarget="{Binding ElementName=btnTestPopup1}" Placement="Bottom" > <Label Style="{StaticResource TopBubblePanel}" Tag="Top"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80" Name="txtTest1" /> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"> <Button Content="確定" Click="btnOK1_Click" Width="50" Height="25" Margin="5" /> <Button Content="取消" Click="btnCancel1_Click" Width="50" Height="25" Margin="5"/> </StackPanel> </StackPanel> </Label> </Popup> <Popup Name="pop2" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Fade" PlacementTarget="{Binding ElementName=btnTestPopup2}" Placement="Top" > <Label Style="{StaticResource BottomBubblePanel}" Tag="Top"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80" Name="txtTest2" /> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"> <Button Content="確定" Click="btnOK2_Click" Width="50" Height="25" Margin="5"/> <Button Content="取消" Click="btnCancel2_Click" Width="50" Height="25" Margin="5"/> </StackPanel> </StackPanel> </Label> </Popup> <Popup Name="pop3" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Scroll" PlacementTarget="{Binding ElementName=btnTestPopup3}" Placement="Right" > <Label Style="{StaticResource LeftBubblePanel}" Tag="Top"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80" Name="txtTest3" /> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"> <Button Content="確定" Click="btnOK2_Click" Width="50" Height="25" Margin="5"/> <Button Content="取消" Click="btnCancel3_Click" Width="50" Height="25" Margin="5"/> </StackPanel> </StackPanel> </Label> </Popup> <Popup Name="pop4" AllowsTransparency="True" StaysOpen="False" PopupAnimation="None" PlacementTarget="{Binding ElementName=btnTestPopup4}" Placement="Left" > <Label Style="{StaticResource RightBubblePanel}" Tag="Top"> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="abc" /> <TextBox Width="80" Name="txtTest4" /> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"> <Button Content="確定" Click="btnOK4_Click" Width="50" Height="25" Margin="5"/> <Button Content="取消" Click="btnCancel4_Click" Width="50" Height="25" Margin="5"/> </StackPanel> </StackPanel> </Label> </Popup> </StackPanel></Window>后臺代碼，很簡單，就是控制pupup顯示或隱藏
private void btnTestPopup1_Click(object sender, RoutedEventArgs e) { pop1.IsOpen = true; } private void btnOK1_Click(object sender, RoutedEventArgs e) { pop1.IsOpen = false; } private void btnCancel1_Click(object sender, RoutedEventArgs e) { pop1.IsOpen = false; } private void btnTestPopup2_Click(object sender, RoutedEventArgs e) { pop2.IsOpen = true; } private void btnOK2_Click(object sender, RoutedEventArgs e) { pop2.IsOpen = false; } private void btnCancel2_Click(object sender, RoutedEventArgs e) { pop2.IsOpen = false; } private void btnTestPopup3_Click(object sender, RoutedEventArgs e) { pop3.IsOpen = true; } private void btnOK3_Click(object sender, RoutedEventArgs e) { pop3.IsOpen = false; } private void btnCancel3_Click(object sender, RoutedEventArgs e) { pop3.IsOpen = false; } private void btnTestPopup4_Click(object sender, RoutedEventArgs e) { pop4.IsOpen = true; } private void btnOK4_Click(object sender, RoutedEventArgs e) { pop4.IsOpen = false; } private void btnCancel4_Click(object sender, RoutedEventArgs e) { pop4.IsOpen = false; }以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VeVb武林網。
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