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TileSource/TileImageLoader

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ClemensFischer 2025-11-13 17:06:33 +01:00
parent cb8fff0dd1
commit 4912fa1e40
3 changed files with 37 additions and 66 deletions
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29
MapControl/Shared/TileImageLoader.cs
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@ -13,13 +13,13 @@ namespace MapControl
public interface ITileImageLoader
{
/// <summary>
/// Loads all pending tiles from the tiles collection.
/// Tile image caching is enabled when tileSource.UriFormat starts with "http" and cacheName is a non-empty string.
/// Loads all pending tiles from the tiles collection. Tile image caching is enabled
/// when cacheName is a non-empty string and tiles are loaded from http or https Uris.
/// </summary>
void BeginLoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string cacheName, IProgress<double> progress);
/// <summary>
/// Cancels a potentially ongoing tile loading task.
/// Terminates all running tile loading tasks.
/// </summary>
void CancelLoadTiles();
}
@ -76,7 +76,7 @@ namespace MapControl
public void BeginLoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string cacheName, IProgress<double> progress)
{
if (Cache == null || !tileSource.Cacheable)
if (Cache == null)
{
cacheName = null; // disable caching
}
@ -142,25 +142,26 @@ namespace MapControl
try
{
// Pass tileSource.LoadImageAsync calls to platform-specific method
// Pass image loading callbacks to platform-specific method
// tile.LoadImageAsync(Func<Task<ImageSource>>) for completion in the UI thread.
if (string.IsNullOrEmpty(cacheName))
var uri = tileSource.GetUri(tile.ZoomLevel, tile.Column, tile.Row);
if (uri == null)
{
await tile.LoadImageAsync(() => tileSource.LoadImageAsync(tile.ZoomLevel, tile.Column, tile.Row)).ConfigureAwait(false);
}
else if (uri.Scheme != "http" && uri.Scheme != "https" || string.IsNullOrEmpty(cacheName))
{
await tile.LoadImageAsync(() => ImageLoader.LoadImageAsync(uri)).ConfigureAwait(false);
}
else
{
var uri = tileSource.GetUri(tile.ZoomLevel, tile.Column, tile.Row);
var buffer = await LoadCachedBuffer(tile, uri, cacheName).ConfigureAwait(false);
if (uri != null)
if (buffer?.Length > 0)
{
var buffer = await LoadCachedBuffer(tile, uri, cacheName).ConfigureAwait(false);
if (buffer?.Length > 0)
{
await tile.LoadImageAsync(() => tileSource.LoadImageAsync(buffer)).ConfigureAwait(false);
}
await tile.LoadImageAsync(() => ImageLoader.LoadImageAsync(buffer)).ConfigureAwait(false);
}
}
}