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Added Tile.SetImageAsync

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Clemens 2021-06-27 21:50:13 +02:00
parent 772549c109
commit 9ebc88204b
4 changed files with 42 additions and 40 deletions
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32
MapControl/UWP/Tile.UWP.cs
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@ -3,12 +3,15 @@
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Threading.Tasks;
#if WINUI
using Microsoft.System;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Media;
using Microsoft.UI.Xaml.Media.Imaging;
#else
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
@ -19,6 +22,35 @@ namespace MapControl
{
public partial class Tile
{
public async Task SetImageAsync(Func<Task<ImageSource>> loadImageFunc)
{
var tcs = new TaskCompletionSource<object>();
async void callback()
{
try
{
SetImage(await loadImageFunc());
tcs.SetResult(null);
}
catch (Exception ex)
{
tcs.SetException(ex);
}
}
#if WINUI
if (!Image.DispatcherQueue.TryEnqueue(DispatcherQueuePriority.Low, callback))
{
// should never happen, but just in case: reset Pending state and complete TaskCompletionSource
Pending = true;
tcs.SetResult(null);
}
#else
_ = Image.Dispatcher.RunAsync(CoreDispatcherPriority.Low, callback);
#endif
_ = await tcs.Task.ConfigureAwait(false); // wait until image loading in UI thread is completed
}
public void SetImage(ImageSource image, bool fadeIn = true)
{
Pending = false;