2010-04-20 89 views
0

Im試圖解決以下問題時遇到問題。WPF Prism Key事件問題

我有2個模塊w/views(A & B)。

在模塊A我有一個列表框項目1-4。我有一個按鍵事件,每次按下'Enter'鍵打開模塊B,這個事件在包含列表框的網格上。

模塊B我有一個按鈕,關閉模塊B並打開模塊A.我在此控件上設置的唯一屬性是IsDefault = true。

當我按下'Enter'時,模塊B關閉但是模塊A現在還捕獲了鍵盤事件,這導致無限循環的'Enter'鍵被按下。

我一直在爲此奮鬥了2天,所以任何幫助,將不勝感激。

代碼如下樣品:

模塊A - 的.xaml

<UserControl x:Class="Module1.UxModule1" 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      mc:Ignorable="d" d:DesignHeight="700" d:DesignWidth="800"> 
     <Grid Focusable="False"> 
     <Grid Name="MainGrid" KeyUp="MainGrid_KeyUp" Loaded="UserControl_Loaded"> 
      <ListBox Grid.Column="0" Width="Auto" Foreground="White" Background="Black" Height="520" BorderThickness="0" Name="lstMenuLeft" IsTabStop="True" IsSynchronizedWithCurrentItem="False" IsTextSearchEnabled="False"></ListBox> 
      </Grid> 
     </Grid> 
</UserControl> 

模塊A - 的.cs

private void MainGrid_KeyUp(object sender, System.Windows.Input.KeyEventArgs e) 
    { 
     if (e.Key == Key.Enter) 
     { 
      if (lstMenuLeft.SelectedItems.Count > 0) 
      { 
       MessageBox.Show(lstMenuLeft.SelectedItem.ToString()); 
       OpenModuleB(); 
      } 
     } 
    } 

    //standard prism code to inject new view. 
    private void OpenModuleB() 
    { 

     var regionManager = _container.Resolve<IRegionManager>(); 
     var view = regionManager.Regions["Main"].GetView("uxMod2"); 

     if (view == null) 
     { 
      var m = _container.Resolve<IModuleManager>(); 
      m.LoadModule("Mod2"); 
     } 
     else 
     { 
      regionManager.Regions["Main"].Activate(view); 
     } 

    } 

    //make sure i have focus on the listbox to allow my keyboard to move up and down. 
    private void UserControl_Loaded(object sender, RoutedEventArgs e) 
    { 
     lstMenuLeft.Focus(); 
    } 

模塊B - 的.xaml

<UserControl 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" 
      d:DesignHeight="800" d:DesignWidth="600"> 
    <Grid Height="805" Width="Auto" Name="mainGrid" KeyUp="Grid_KeyUp_1" Background="#FFF5EFEF" Loaded="mainGrid_Loaded"> 
     <Label Content="Module 2 View" FontSize="24" Foreground="#FF9C03FC" Height="47" HorizontalAlignment="Left" Margin="174,12,0,0" Name="label1" VerticalAlignment="Top" Width="174" /> 
     <Label Content="Module 2 View" FontSize="20" Foreground="#FFFF940A" Height="41" HorizontalAlignment="Left" Margin="12,12,0,0" Name="label2" VerticalAlignment="Top" Width="146" FontStyle="Italic" /> 
     <TextBox Height="23" HorizontalAlignment="Left" Margin="496,28,0,0" Name="textBox1" VerticalAlignment="Top" Width="92" /> 
     <Grid Focusable="True" Margin="0,84,0,457"> 
       <Button Content="Switch Module" Height="23" IsDefault="True" HorizontalAlignment="Left" Name="button1" VerticalAlignment="Top" Width="119" IsDefault="True" Click="button1_Click" /> 
</Grid> 
    </Grid> 
</UserControl> 

模塊B - .cs

private void button1_Click(object sender, RoutedEventArgs e) 
    { 
     var regionMan = _container.Resolve<IRegionManager>(); 
     var prevView2 = regionMan.Regions["Main"].GetView("uxMod1"); 
     regionMan.Regions["Main"].Activate(prevView2); 
    } 

我希望這個問題能夠解決一些問題。

+0

某些代碼示例將是有益的,但你可能要考慮Handled屬性的EventArgs對象發送到您的事件處理器代碼。 – juharr 2010-04-20 13:41:36

回答

0

'Enter'鍵在OnKeyDown事件中觸發Click事件。按下Enter鍵後模塊B關閉,模塊A再次啓動。所以,父表單在密鑰釋放的時候被激活,並且它得到密鑰提示消息。

換句話說,在OnKeyDown中處理Enter鍵,而不是OnKeyUp。

(順便說一句:「Space'鍵被觸發點擊事件的onkeyup。)