[W 8.1]隐藏特定页面上的按钮 [英] [W 8.1] Hide button on certain page

问题描述

我有1 xml用于所有其他页面。

XAML：

<网格x：名称=" LayoutRoot"> 
 
< Grid.ChildrenTransitions> 
< TransitionCollection> 
< EntranceThemeTransition /> 
< / TransitionCollection> 
< /Grid.ChildrenTransitions> 
 
< Grid.RowDefinitions> 
< RowDefinition Height =" Auto" /> 
< RowDefinition Height =" *" /> 
< /Grid.RowDefinitions> 
 
 
<！ -  TODO：内容应放在以下网格中 - > 
< Grid Grid.Row =" 1" X：名称= QUOT; ContentRoot"余量= QUOT; 19,0,0,0"> 
< AppBarButton x：Name =" playBtn"图标= QUOT;播放"的Horizo​​ntalAlignment = QUOT;右"能见度= QUOT;折叠"点击= QUOT; playBtn_Click" /> 
< AppBarButton x：Name =" pauseBtn"图标= QUOT;暂停"的Horizo​​ntalAlignment = QUOT;右"点击= QUOT; playBtn_Click" /> 
< MediaElement x：Name =" soundTrack"能见度= QUOT;折叠" AudioCategory = QUOT; ForegroundOnlyMedia" IsLooping = QUOT;真"源= QUOT;资产/ ost.mp3" /> 
< Frame x：Name =" mainFrame"背景= QUOT; {X：空}" /> 
< / Grid> 
< / Grid> 

代码：

 const string soundTrackToken =" soundtrack" ;; 
 int flag = 1; 
 
 protected async override void OnNavigatedTo（NavigationEventArgs e）
 {
 navigationHelper.OnNavigatedTo（e）; 
 mainFrame.Navigate（typeof（Home1））; 
 
 if（StorageApplicationPermissions.FutureAccessList.ContainsItem（soundTrackToken））
 {
 
 StorageFile audioFile = await StorageApplicationPermissions.FutureAccessList.GetFileAsync（soundTrackToken）; 
 if（audioFile！= null）
 {
 await StartAudio（audioFile）; 
} 
} 
 
} 
 
私有异步System.Threading.Tasks.Task StartAudio（StorageFile audioFile）
 {
 var audio = await audioFile.OpenAsync（FileAccessMode.Read）; 
 var props = await audioFile.Properties.GetMusicPropertiesAsync（）; 
 
 soundTrack.SetSource（audio，audioFile.ContentType）; 
 
} 
 
 // private void playButton_Checked（object sender，RoutedEventArgs e）
 // {
 // soundTrack.Play（）; 
 //} 
 
 // private void playButton_Unchecked（object sender，RoutedEventArgs e）
 // {
 // soundTrack.Pause（）; 
 //} 
 
 private void playBtn_Tapped（object sender，TappedRoutedEventArgs e）
 {
 if（flag == 1）
 {
 //playBtn.Icon = 
 //playBtn.Source = new BitmapImage（new Uri（" ms-appx：/images/media/play.png"））; 
 flag = 0; 
 soundTrack.Pause（）; 
 playBtn.Visibility = Visibility.Visible; 
 pauseBtn.Visibility = Visibility.Collapsed; 
} 
 else if（flag == 0）
 {
 //playBtn.Source = new BitmapImage（new Uri（" ms-appx：/ images / media / pause .PNG"））; 
 flag = 1; 
 soundTrack.Play（）; 
 playBtn.Visibility = Visibility.Collapsed; 
 pauseBtn.Visibility = Visibility.Visible; 
 
} 
} 
} 
} 

如何隐藏特定页面上的按钮（例如：主页），但按钮出现在其他页面上？

注意：

我想隐藏playBtn

解决方案

嗨Priscillia，

Welcome开发通用Windows应用程序
论坛！

默认情况下，playBtn折叠如下：

< AppBarButton x：Name =" playBtn"图标= QUOT;播放"的Horizo​​ntalAlignment = QUOT;右" 
 可见性="折叠" Click =" playBtn_Click" /> 

如果我没有误解你，为了隐藏特定页面上的按钮（例如：主页） ，但按钮出现在其他页面上，请在除主页之外的其他页面中添加以下代码：
$

 protected override void OnNavigatedTo（NavigationEventArgs e）
 {
 navigationHelper.OnNavigatedTo（e）; 
  playBtn.Visibility = Visibility.Visible;  
} 

通过这种方式playBtn在其他页面中可见但在主页中已折叠。

最好的问候，

Amy Peng

I have 1 xml to be used in all the other page.

XAML:

 <Grid x:Name="LayoutRoot">

        <Grid.ChildrenTransitions>
            <TransitionCollection>
                <EntranceThemeTransition/>
            </TransitionCollection>
        </Grid.ChildrenTransitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>


        <!--TODO: Content should be placed within the following grid-->
        <Grid Grid.Row="1" x:Name="ContentRoot" Margin="19,0,0,0">
            <AppBarButton x:Name="playBtn" Icon="Play" HorizontalAlignment="Right" Visibility="Collapsed" Click="playBtn_Click" />
            <AppBarButton x:Name="pauseBtn" Icon="Pause" HorizontalAlignment="Right" Click="playBtn_Click" />
            <MediaElement x:Name="soundTrack" Visibility="Collapsed" AudioCategory="ForegroundOnlyMedia" IsLooping="True" Source="Assets/ost.mp3" />
            <Frame x:Name="mainFrame" Background="{x:Null}" />
        </Grid>
    </Grid>

Code:

const string soundTrackToken = "soundtrack";
        int flag = 1;

        protected async override void OnNavigatedTo(NavigationEventArgs e)
        {
            navigationHelper.OnNavigatedTo(e);
            mainFrame.Navigate(typeof(Home1));

            if (StorageApplicationPermissions.FutureAccessList.ContainsItem(soundTrackToken))
            {

                StorageFile audioFile = await StorageApplicationPermissions.FutureAccessList.GetFileAsync(soundTrackToken);
                if (audioFile != null)
                {
                    await StartAudio(audioFile);
                }
            }
           
        }

        private async System.Threading.Tasks.Task StartAudio(StorageFile audioFile)
        {
            var audio = await audioFile.OpenAsync(FileAccessMode.Read);
            var props = await audioFile.Properties.GetMusicPropertiesAsync();

            soundTrack.SetSource(audio, audioFile.ContentType);
            
        }

        //private void playButton_Checked(object sender, RoutedEventArgs e)
        //{
        //    soundTrack.Play();
        //}

        //private void playButton_Unchecked(object sender, RoutedEventArgs e)
        //{
        //    soundTrack.Pause();
        //}

        private void playBtn_Tapped(object sender, TappedRoutedEventArgs e)
        {
            if (flag == 1) 
            {
                //playBtn.Icon = 
                //playBtn.Source = new BitmapImage(new Uri("ms-appx:/images/media/play.png"));
                flag = 0;
                soundTrack.Pause();
                playBtn.Visibility = Visibility.Visible;
                pauseBtn.Visibility = Visibility.Collapsed;
            }
            else if (flag == 0)
            {
                //playBtn.Source = new BitmapImage(new Uri("ms-appx:/images/media/pause.png"));
                flag = 1;
                soundTrack.Play();
                playBtn.Visibility = Visibility.Collapsed;
                pauseBtn.Visibility = Visibility.Visible;
                
            }
        }
    }
}

How to hide the button on a specific page (for example: the home page), but the button appears on other pages?

Note:

i want to hide playBtn

解决方案

Hi Priscillia,

Welcome to the Developing Universal Windows apps forum!

By default the playBtn is collapsed as following:

<AppBarButton x:Name="playBtn" Icon="Play" HorizontalAlignment="Right" 
Visibility="Collapsed" Click="playBtn_Click" />

If I do not misunderstood you, in order to hide the button on a specific page (for example: the home page), but the button appears on other pages, please add the following code in the others page except the home page:

  protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            navigationHelper.OnNavigatedTo(e);
            playBtn.Visibility = Visibility.Visible;
        }

In this way the playBtn is visible in others page but collapsed in home page.

Best Regards,
Amy Peng

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