ClemensFischer/XAML-Map-Control
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Version 4.10.0: Simplified TileImageLoader.

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This commit is contained in:
ClemensF 2018-08-21 23:56:54 +02:00
parent f6135d2bfb
commit be3a247064
6 changed files with 113 additions and 101 deletions
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36
MapControl/UWP/TileImageLoader.UWP.cs
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@ -26,12 +26,7 @@ namespace MapControl
/// </summary>
public static Caching.IImageCache Cache { get; set; }
/// <summary>
/// Gets or sets the maximum number of concurrent connections. The default value is 2.
/// </summary>
public static int DefaultConnectionLimit { get; set; } = 2;
private async Task LoadTileImageAsync(Tile tile, Uri uri, string cacheKey)
private async Task LoadCachedTileImageAsync(Tile tile, Uri uri, string cacheKey)
{
var cacheItem = await Cache.GetAsync(cacheKey);
var cacheBuffer = cacheItem?.Buffer;
@ -46,7 +41,7 @@ namespace MapControl
if (result.Item1 != null) // tile image available
{
await SetTileImageAsync(tile, result.Item1); // show before caching
await LoadTileImageAsync(tile, result.Item1);
await Cache.SetAsync(cacheKey, result.Item1, GetExpiration(result.Item2));
}
}
@ -54,21 +49,20 @@ namespace MapControl
if (cacheBuffer != null)
{
await SetTileImageAsync(tile, cacheBuffer);
await LoadTileImageAsync(tile, cacheBuffer);
}
}
private async Task SetTileImageAsync(Tile tile, IBuffer buffer)
private async Task LoadTileImageAsync(Tile tile, IBuffer buffer)
{
var tcs = new TaskCompletionSource<object>();
using (var stream = new InMemoryRandomAccessStream())
{
await stream.WriteAsync(buffer);
await stream.FlushAsync(); // necessary?
stream.Seek(0);
await tile.Image.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
await tile.Image.Dispatcher.RunAsync(CoreDispatcherPriority.Low, async () =>
{
try
{
@ -84,5 +78,25 @@ namespace MapControl
await tcs.Task;
}
private async Task LoadTileImageAsync(Tile tile, TileSource tileSource)
{
var tcs = new TaskCompletionSource<object>();
await tile.Image.Dispatcher.RunAsync(CoreDispatcherPriority.Low, async () =>
{
try
{
tile.SetImage(await tileSource.LoadImageAsync(tile.XIndex, tile.Y, tile.ZoomLevel));
tcs.SetResult(null);
}
catch (Exception ex)
{
tcs.SetException(ex);
}
});
await tcs.Task;
}
}
}