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我在Xamarin.Forms中製作了一個mp3播放器，其中的滑塊應該顯示時間已到，並允許跳轉到軌道中的位置。 據我所知，只有ValueChanged事件可用，不幸的副作用是每當我的計時器更新滑塊值時，我也會觸發我的player.SeekTo方法，導致播放失敗。Xamarin.Forms Slider.Clicked事件？
有沒有什麼辦法來專門選取滑塊上的觸摸事件？ 如果沒有，有沒有人有任何建議如何使這項工作？
如果它是相關的，這裏是我的代碼的MainPage：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace MuZor
{
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
PlayButton.Clicked += PlayButton_Clicked;
PlaylistsButton.Clicked += PlaylistsButton_Clicked;
RandomButton.Clicked += RandomButton_Clicked;
RepeatButton.Clicked += RepeatButton_Clicked;
ChoiceButton.Clicked += ChoiceButton_Clicked;
PreviousButton.Clicked += PreviousButton_Clicked;
NextButton.Clicked += NextButton_Clicked;
TimeSlider.ValueChanged += TimeSlider_ValueChanged;
MessagingCenter.Subscribe<Interfaces.IAudioPlayer>(App.player, "PlayerPrepared", (args) =>
{
System.Diagnostics.Debug.WriteLine("Message received");
PlayerPrepared();
});
}
private void TimeSlider_ValueChanged(object sender, ValueChangedEventArgs e)
{
System.Diagnostics.Debug.WriteLine("Slider value changed, value = " + e.NewValue + "(int = " + (int)e.NewValue);
//App.player.SeekTo((int)e.NewValue);
}
private void NextButton_Clicked(object sender, EventArgs e)
{
if (!App.settings.RandomOn && App.settings.CurrentTrack < App.playlist.Count - 1)
{
Play((int)App.settings.CurrentTrack + 1);
}
}
private void PreviousButton_Clicked(object sender, EventArgs e)
{
if (!App.settings.RandomOn && App.settings.CurrentTrack > 0)
{
Play((int)App.settings.CurrentTrack - 1);
}
}
private void ChoiceButton_Clicked(object sender, EventArgs e)
{
}
private void RepeatButton_Clicked(object sender, EventArgs e)
{
}
private void RandomButton_Clicked(object sender, EventArgs e)
{
}
private void PlaylistsButton_Clicked(object sender, EventArgs e)
{
}
private void PlayButton_Clicked(object sender, EventArgs e)
{
if (App.settings.IsPaused || App.player.IsPlaying())
{
App.player.PauseResume();
if (App.settings.IsPaused)
{
UnPause();
}
else
{
Pause();
}
}
else
{
int trackToplay = App.settings.CurrentTrack != null ? (int)App.settings.CurrentTrack : 0;
Play(trackToplay);
}
}
private void Play(int currentTrack)
{
HelperClasses.SettingsHelper.SaveCurrentTrack(currentTrack);
App.player.LoadAndPlay(App.playlist[currentTrack].Path);
}
private void Pause()
{
HelperClasses.SettingsHelper.SavePausedState(true);
Device.BeginInvokeOnMainThread(() =>
{
PlayButton.Text = "Play";
});
}
private void UnPause()
{
HelperClasses.SettingsHelper.SavePausedState(false);
Device.BeginInvokeOnMainThread(() =>
{
PlayButton.Text = "Pause";
});
StartTimer();
}
private void StartTimer()
{
double position;
Device.StartTimer(new TimeSpan(0, 0, 1),() =>
{
position = App.player.GetCurrentPosition();
TimeSpan runTime = TimeSpan.FromMilliseconds(position);
Device.BeginInvokeOnMainThread(() =>
{
TimeLabel.Text = runTime.ToString(@"mm\:ss");
TimeSlider.Value = position;
});
if (App.player.IsPlaying())
return true;
else
return false;
});
}
private void PlayerPrepared()
{
var totalDurationInMS = App.player.GetDuration();
TimeSlider.Maximum = totalDurationInMS;
TimeSlider.Minimum = 0;
TimeSpan totalDuration = TimeSpan.FromMilliseconds(totalDurationInMS);
Device.BeginInvokeOnMainThread(() =>
{
RemainingTimeLabel.Text = totalDuration.ToString(@"mm\:ss");
TimeLabel.Text = "00:00";
});
UnPause();
}
}
}