页面设计需求，做了一个气泡形状的弹出框，效果如下：
设计思路如下：
1. 使用Path绘制气泡的尖尖，将这个放到顶层；
2. 在用border绘制长方形框，将这个放到底层，并且设置Margin值，使得Path图层和border看起来衔接在一起。
代码如下：
1 <Window x:Class="BubblePanelTest.MainWindow"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 Title="MainWindow" Height="350" Width="525">
5 <Window.Resources>
6 <Style TargetType="Label" x:Key="TopBubblePanel">
7 <Setter Property="Template">
8 <Setter.Value>
9 <ControlTemplate TargetType="{x:Type Label}">
10 <Grid>
11 <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Top" Background="Yellow" HorizontalAlignment="Left" Margin="0,8.5,0,0" Padding="5">
12 <ContentPresenter />
13 </Border>
14 <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,0,0,0" Background="Transparent">
15 <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">
16 <Path.Data>
17 <PathGeometry Figures="M 0,10
18 L 0,10,5,0
19 L 5,0,10,10
20 "/>
21 </Path.Data>
22 </Path>
23 </Canvas>
24 </Grid>
25 </ControlTemplate>
26 </Setter.Value>
27 </Setter>
28 </Style>
29 <Style TargetType="Label" x:Key="BottomBubblePanel">
30 <Setter Property="Template">
31 <Setter.Value>
32 <ControlTemplate TargetType="{x:Type Label}">
33 <Grid>
34 <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Bottom" Margin="0,0,0,8.5" Background="Yellow" HorizontalAlignment="Left" Padding="5">
35 <ContentPresenter />
36 </Border>
37 <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,0,0,0" Background="Transparent">
38 <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">
39 <Path.Data>
40 <PathGeometry Figures="M 0,0
41 L 0,0,5,10
42 L 5,10,10,0
43 "/>
44 </Path.Data>
45 </Path>
46 </Canvas>
47 </Grid>
48 </ControlTemplate>
49 </Setter.Value>
50 </Setter>
51 </Style>
52 <Style TargetType="Label" x:Key="LeftBubblePanel">
53 <Setter Property="Template">
54 <Setter.Value>
55 <ControlTemplate TargetType="{x:Type Label}">
56 <Grid>
57 <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Top" Margin="8.5,0,0,0" Background="Yellow" HorizontalAlignment="Left" Padding="5">
58 <ContentPresenter />
59 </Border>
60 <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,10,0,0" Background="Transparent">
61 <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">
62 <Path.Data>
63 <PathGeometry Figures="M 10,0
64 L 10,0,0,5
65 L 0,5,10,10
66 "/>
67 </Path.Data>
68 </Path>
69 </Canvas>
70 </Grid>
71 </ControlTemplate>
72 </Setter.Value>
73 </Setter>
74 </Style>
75 <Style TargetType="Label" x:Key="RightBubblePanel">
76 <Setter Property="Template">
77 <Setter.Value>
78 <ControlTemplate TargetType="{x:Type Label}">
79 <Grid HorizontalAlignment="Left">
80 <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,0,8.5,0" Background="Yellow" Padding="5">
81 <ContentPresenter />
82 </Border>
83 <Canvas Width="10" Height="10" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,10,0,0" Background="Transparent">
84 <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">
85 <Path.Data>
86 <PathGeometry Figures="M 0,0
87 L 0,0,10,5
88 L 10,5,0,10
89 "/>
90 </Path.Data>
91 </Path>
92 </Canvas>
93 </Grid>
94 </ControlTemplate>
95 </Setter.Value>
96 </Setter>
97 </Style>
98 </Window.Resources>
99 <StackPanel>
100 <Label Style="{StaticResource TopBubblePanel}" Tag="Top" Margin="2">
101 <StackPanel>
102 <StackPanel Orientation="Horizontal">
103 <TextBlock Text="abc" />
104 <TextBox Width="80"/>
105 </StackPanel>
106 </StackPanel>
107 </Label>
108 <Label Style="{StaticResource BottomBubblePanel}" Tag="Top" Margin="2">
109 <StackPanel>
110 <StackPanel Orientation="Horizontal">
111 <TextBlock Text="abc" />
112 <TextBox Width="80"/>
113 </StackPanel>
114 </StackPanel>
115 </Label>
116 <Label Style="{StaticResource LeftBubblePanel}" Tag="Top" Margin="2">
117 <StackPanel>
118 <StackPanel Orientation="Horizontal">
119 <TextBlock Text="abc" />
120 <TextBox Width="80"/>
121 </StackPanel>
122 </StackPanel>
123 </Label>
124 <Label Style="{StaticResource RightBubblePanel}" Tag="Top" Margin="2">
125 <StackPanel>
126 <StackPanel Orientation="Horizontal">
127 <TextBlock Text="abc" />
128 <TextBox Width="80"/>
129 </StackPanel>
130 </StackPanel>
131 </Label>
132 <StackPanel Orientation="Horizontal" Margin="0,30,0,0">
133 <Button Name="btnTestPopup1" Width="100" Height="30" Content="Bottom" Click="btnTestPopup1_Click" />
134 <Button Name="btnTestPopup2" Width="100" Height="30" Content="Top" Click="btnTestPopup2_Click" />
135 <Button Name="btnTestPopup3" Width="100" Height="30" Content="Right" Click="btnTestPopup3_Click" />
136 <Button Name="btnTestPopup4" Width="100" Height="30" Content="Left" Click="btnTestPopup4_Click" />
137 </StackPanel>
138 <Popup Name="pop1" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Slide" PlacementTarget="{Binding ElementName=btnTestPopup1}" Placement="Bottom" >
139 <Label Style="{StaticResource TopBubblePanel}" Tag="Top">
140 <StackPanel>
141 <StackPanel Orientation="Horizontal">
142 <TextBlock Text="abc" />
143 <TextBox Width="80" Name="txtTest1" />
144 </StackPanel>
145 <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
146 <Button Content="确定" Click="btnOK1_Click" Width="50" Height="25" Margin="5" />
147 <Button Content="取消" Click="btnCancel1_Click" Width="50" Height="25" Margin="5"/>
148 </StackPanel>
149 </StackPanel>
150 </Label>
151 </Popup>
152 <Popup Name="pop2" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Fade" PlacementTarget="{Binding ElementName=btnTestPopup2}" Placement="Top" >
153 <Label Style="{StaticResource BottomBubblePanel}" Tag="Top">
154 <StackPanel>
155 <StackPanel Orientation="Horizontal">
156 <TextBlock Text="abc" />
157 <TextBox Width="80" Name="txtTest2" />
158 </StackPanel>
159 <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
160 <Button Content="确定" Click="btnOK2_Click" Width="50" Height="25" Margin="5"/>
161 <Button Content="取消" Click="btnCancel2_Click" Width="50" Height="25" Margin="5"/>
162 </StackPanel>
163 </StackPanel>
164 </Label>
165 </Popup>
166 <Popup Name="pop3" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Scroll" PlacementTarget="{Binding ElementName=btnTestPopup3}" Placement="Right" >
167 <Label Style="{StaticResource LeftBubblePanel}" Tag="Top">
168 <StackPanel>
169 <StackPanel Orientation="Horizontal">
170 <TextBlock Text="abc" />
171 <TextBox Width="80" Name="txtTest3" />
172 </StackPanel>
173 <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
174 <Button Content="确定" Click="btnOK2_Click" Width="50" Height="25" Margin="5"/>
175 <Button Content="取消" Click="btnCancel3_Click" Width="50" Height="25" Margin="5"/>
176 </StackPanel>
177 </StackPanel>
178 </Label>
179 </Popup>
180 <Popup Name="pop4" AllowsTransparency="True" StaysOpen="False" PopupAnimation="None" PlacementTarget="{Binding ElementName=btnTestPopup4}" Placement="Left" >
181 <Label Style="{StaticResource RightBubblePanel}" Tag="Top">
182 <StackPanel>
183 <StackPanel Orientation="Horizontal">
184 <TextBlock Text="abc" />
185 <TextBox Width="80" Name="txtTest4" />
186 </StackPanel>
187 <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
188 <Button Content="确定" Click="btnOK4_Click" Width="50" Height="25" Margin="5"/>
189 <Button Content="取消" Click="btnCancel4_Click" Width="50" Height="25" Margin="5"/>
190 </StackPanel>
191 </StackPanel>
192 </Label>
193 </Popup>
194 </StackPanel>
195 </Window>
后台代码，很简单，就是控制pupup显示或隐藏
1 private void btnTestPopup1_Click(object sender, RoutedEventArgs e)
2 {
3 pop1.IsOpen = true;
4 }
5 private void btnOK1_Click(object sender, RoutedEventArgs e)
6 {
7 pop1.IsOpen = false;
8 }
9 private void btnCancel1_Click(object sender, RoutedEventArgs e)
10 {
11 pop1.IsOpen = false;
12 }
13
14 private void btnTestPopup2_Click(object sender, RoutedEventArgs e)
15 {
16 pop2.IsOpen = true;
17 }
18 private void btnOK2_Click(object sender, RoutedEventArgs e)
19 {
20 pop2.IsOpen = false;
21 }
22 private void btnCancel2_Click(object sender, RoutedEventArgs e)
23 {
24 pop2.IsOpen = false;
25 }
26
27 private void btnTestPopup3_Click(object sender, RoutedEventArgs e)
28 {
29 pop3.IsOpen = true;
30 }
31 private void btnOK3_Click(object sender, RoutedEventArgs e)
32 {
33 pop3.IsOpen = false;
34 }
35 private void btnCancel3_Click(object sender, RoutedEventArgs e)
36 {
37 pop3.IsOpen = false;
38 }
39
40 private void btnTestPopup4_Click(object sender, RoutedEventArgs e)
41 {
42 pop4.IsOpen = true;
43 }
44 private void btnOK4_Click(object sender, RoutedEventArgs e)
45 {
46 pop4.IsOpen = false;
47 }
48 private void btnCancel4_Click(object sender, RoutedEventArgs e)
49 {
50 pop4.IsOpen = false;
51 }
如有问题，还忘大家拍砖。