Question

如何使用VB / XAML从WP中的appbar图标（如在whatsapp中附加）创建弹出菜单。我尝试使用导航，但无法执行它而不是导航到另一个页面??

Answer 1

看来，在whatsapp中附加是一个简单的网格，AppBar中的按钮只会改变其可见性。另外，如果附加网格内容可见，则OnBackKeyPress页面设置为e.Cancel = true。

所以XAML看起来像这样：

<Grid x:Name="LayoutRoot"
      Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" /> <!--Header-->
        <RowDefinition Height="*" />    <!--Content-->
        <RowDefinition Height="Auto" /> <!--Fake popup-->
    </Grid.RowDefinitions>
    <!-- ... -->
    <Grid Grid.Row="2"
          x:Name="SomeName"
          Visibility="Collapsed">
        <!-- Fake popup-->
    </Grid>
</Grid>

<强>更新

对于您，页面内容应如下所示：

<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot"
      Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" /> <!--Header-->
        <RowDefinition Height="*" />    <!--Content-->
        <RowDefinition Height="Auto" /> <!--Fake popup-->
    </Grid.RowDefinitions>
    <StackPanel x:Name="TitlePanel"
                Grid.Row="0"
                Margin="12,17,0,28">
        <!--TitlePanel contains the name of the application and page title-->
    </StackPanel>
    <Grid x:Name="ContentPanel"
          Grid.Row="1"
          Margin="12,0,12,0">
        <!--ContentPanel - place additional content here-->
    </Grid>
    <Grid Grid.Row="2"
          x:Name="SomeName"
          Visibility="Collapsed">
        <!--Popup-->
    </Grid>
</Grid>
<phone:PhoneApplicationPage.ApplicationBar>
    <shell:ApplicationBar>
        <shell:ApplicationBarIconButton Text="show popup"
                                        IconUri="/icon.png"
                                        Click="ApplicationBarIconButton_Click" />
    </shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>

VB.net上的页面代码如下所示：

Partial Public Class MainPage
    Inherits PhoneApplicationPage

    Public Sub New()
        InitializeComponent()
    End Sub

    ' If you want to hide popup when Back key pressed '    
    Protected Overrides Sub OnBackKeyPress(e As ComponentModel.CancelEventArgs)
        If SomeName.Visibility = Windows.Visibility.Visible Then
            SomeName.Visibility = Windows.Visibility.Collapsed
            e.Cancel = True
        End If

        MyBase.OnBackKeyPress(e)
    End Sub

    ' Here is popup will appear and hide '    
    Private Sub ApplicationBarIconButton_Click(sender As Object, e As EventArgs)
        If SomeName.Visibility = Windows.Visibility.Visible Then
            SomeName.Visibility = Windows.Visibility.Collapsed
        Else
            SomeName.Visibility = Windows.Visibility.Visible
        End If
    End Sub
End Class

在Windows Phone中弹出菜单

1 个答案: