使用 WPF 创建搜索框
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Creating a search box using WPF
提问by Mr. Bean
I'm trying to create a search box with the controls TextBoxand ListBox.
When I'm on the TextBoxstarting to type an event handler GotFocusopen the ListBox.
I want the ListBoxto be closed when the TextBoxnot on focus. I tried to use the LostFocusevent in the TextBox, but it didn't work.
我正在尝试使用控件TextBox和ListBox. 当我TextBox开始键入事件处理程序时，GotFocus打开ListBox. 我希望在未聚焦ListBox时关闭TextBox。我试图在 中使用该LostFocus事件TextBox，但没有奏效。
In which event handler should I use? I didn't find a good example implements this mechanism.
我应该在哪个事件处理程序中使用？我没有找到一个很好的例子来实现这个机制。
Edit: I have something like that:
编辑：我有这样的事情：
<Canvas Name="m_MainCanvas" Grid.ColumnSpan="2" >
<Rectangle MouseDown="Canvas_MouseDown" Fill="White" Height="280" HorizontalAlignment="Left" Margin="256,12,0,0" x:Name="m_MainRectangle" RadiusX="0" RadiusY="0" Stroke="Black" StrokeThickness="3" VerticalAlignment="Top" Width="238" />
<TextBox Height="23" Margin="10,0,0,210" Name="m_SearchTextBox" VerticalAlignment="Bottom" BorderThickness="0.5" BorderBrush="#69000000" TextChanged="m_SearchTextBox_TextChanged" FontFamily="Kristen ITC" Text="" FontSize="14" FontWeight="Black" HorizontalAlignment="Left" Width="165" Canvas.Top="86" Canvas.Left="274" LostFocus="m_SearchTextBox_LostFocus"/>
<ListBox ItemTemplate="{DynamicResource ListBoxItemDataTemplate}" ItemsSource="{Binding}" Name="m_FriendsSearchList" Visibility="Hidden" Background="#FFBCEB85" Width="181" Height="193" Canvas.Left="283" Canvas.Top="118">
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<EventSetter Event="MouseDoubleClick" Handler="HandleDoubleClickItemToSelect" />
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
The MouseDownevent in the Rectanglecontrol is used to get the TextBoxout of focus, but it isn't working.
控件中的MouseDown事件Rectangle用于获取TextBox焦点，但它不起作用。
回答by Viv
something like:
就像是：
<StackPanel>
<TextBox>
<TextBox.Triggers>
<EventTrigger RoutedEvent="GotFocus">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Duration="0:0:0"
Storyboard.TargetName="lb"
Storyboard.TargetProperty="(ListBox.Opacity)"
To="1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="LostFocus">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Duration="0:0:0"
Storyboard.TargetName="lb"
Storyboard.TargetProperty="(ListBox.Opacity)"
To="0" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</TextBox.Triggers>
</TextBox>
<ListBox x:Name="lb"
Opacity="0">
<ListBoxItem Content="A" />
<ListBoxItem Content="B" />
</ListBox>
</StackPanel>
However in the above approach the ListBoxis still holding the space it resides in. if we instead toggle Visibilityto Collapsed, every-time the ListBoxbecomes Visibleother control's are going to start moving to accomodate that.
然而，在上述方法中，ListBox目前仍持有它驻留在的空间。如果我们不是切换Visibility到Collapsed，每一次的ListBox成为Visible其他控件的将开始移动，以适应这一点。
To avoid both these cases, such things are normally implemented via a Popup
为了避免这两种情况，这些事情通常是通过一个弹出窗口来实现的
<StackPanel>
<TextBox x:Name="tb" />
<Popup Width="{Binding RelativeSource={RelativeSource Self},
Path=PlacementTarget.ActualWidth}"
Placement="Bottom"
PlacementTarget="{Binding ElementName=tb}">
<Popup.Style>
<Style TargetType="{x:Type Popup}">
<Setter Property="IsOpen"
Value="False" />
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=tb,
Path=IsFocused}"
Value="True">
<Setter Property="IsOpen"
Value="True" />
</DataTrigger>
</Style.Triggers>
</Style>
</Popup.Style>
<ListBox>
<ListBoxItem Content="A" />
<ListBoxItem Content="B" />
</ListBox>
</Popup>
</StackPanel>
^^ You'll still see the same output however you no longer have any control's that have to change position due to the popup changing open / close states.
^^ 您仍然会看到相同的输出，但是您不再有任何由于弹出窗口更改打开/关闭状态而必须更改位置的控件。
Update:
更新：
Remember the Triggeris set based on the TextBoxhaving / losing focus. IF you click somewhere that does not take focus, then you will not see the Popup(ListBox) disappear.
请记住，Trigger是基于TextBox拥有/失去焦点而设置的。如果您单击未获得焦点的地方，则您不会看到Popup( ListBox) 消失。
回答by Sargis Tovmasyan
XAML:
XAML：
<Border Grid.Row="0" BorderBrush="Black" BorderThickness="1">
<Grid >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBox Grid.Column="0" BorderThickness="0"
BorderBrush="Transparent"/>
<Button Grid.Column="1" Background="Transparent" BorderThickness="0"
BorderBrush="Transparent">
<Button.Content>
<Image Source="../Resources/$YOUR_SEARCH_ICON"></Image>
</Button.Content>
</Button>
</Grid>
</Grid>
</Border>
Then process listView(or what type of view you have) to only show items that contains search result.
然后处理 listView（或您拥有的视图类型）以仅显示包含搜索结果的项目。
