我有以下代码:
<Page.BottomAppBar>
<AppBar x:Name="MyAppBar" Height="32" IsOpen="True" Opened="MyAppBar_Opened">
<TextBox x:Name="SearchBar" Grid.Row="2" KeyDown="SearchBar_KeyDown"/>
</AppBar>
</Page.BottomAppBar>
问题是它在应用程序打开时没有焦点,当我右键单击两次以关闭并再次打开它时它也没有焦点.
我目前在MyAppBar_Opened和OnNavigatedTo中都有以下代码:
if (MyAppBar == null)
return;
MyAppBar.Focus(Windows.UI.Xaml.FocusState.Keyboard);
if (SearchBar == null)
return;
SearchBar.Focus(Windows.UI.Xaml.FocusState.Keyboard);
但这似乎没有任何影响,其他枚举值如Mouse或Programmatic也不起作用.我做错了什么导致没有激活?
我知道之前曾经有过的替代方案,但Metro FocusManager没有SetFocusedElement吗?
最佳答案 这对我有用:
XAML:
<Page
x:Class="Application5.BlankPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Application5"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{StaticResource ApplicationPageBackgroundBrush}">
<AppBar
x:Name="MyAppBar"
Height="32"
IsOpen="True"
Opened="MyAppBar_Opened"
Loaded="MyAppBar_Loaded"
VerticalAlignment="Bottom">
<TextBox
x:Name="SearchBar"
HorizontalAlignment="Stretch" />
</AppBar>
</Grid>
</Page>
代码背后:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace Application5
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class BlankPage : Page
{
public BlankPage()
{
this.InitializeComponent();
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property is typically used to configure the page.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
}
private void MyAppBar_Opened(object sender, object e)
{
if (SearchBar != null)
SearchBar.Focus(Windows.UI.Xaml.FocusState.Programmatic);
}
private void MyAppBar_Loaded(object sender, RoutedEventArgs e)
{
if (SearchBar != null)
SearchBar.Focus(Windows.UI.Xaml.FocusState.Programmatic);
}
}
}