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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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33
MapControl/Shared/TileSource.cs
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@ -21,30 +21,18 @@ namespace MapControl
#else
[System.ComponentModel.TypeConverter(typeof(TileSourceConverter))]
#endif
public abstract class TileSource
public class TileSource
{
/// <summary>
/// Indicates whether tile images from this source should be cached.
/// Gets the image request Uri for the specified zoom level and tile indices.
/// May return null when the image shall be loaded by the LoadImageAsync method.
/// </summary>
public abstract bool Cacheable { get; }
public virtual Uri GetUri(int zoomLevel, int column, int row) => null;
/// <summary>
/// Gets the image Uri for the specified zoom level and tile indices.
/// Loads a tile image without an Uri.
/// </summary>
public abstract Uri GetUri(int zoomLevel, int column, int row);
/// <summary>
/// Loads a tile image whithout caching.
/// </summary>
public abstract Task<ImageSource> LoadImageAsync(int zoomLevel, int column, int row);
/// <summary>
/// Loads a cacheable tile image from an encoded frame buffer.
/// </summary>
public virtual Task<ImageSource> LoadImageAsync(byte[] buffer)
{
return ImageLoader.LoadImageAsync(buffer);
}
public virtual Task<ImageSource> LoadImageAsync(int zoomLevel, int column, int row) => null;
/// <summary>
/// Creates a TileSource instance from an Uri template string.
@ -78,8 +66,6 @@ namespace MapControl
public string[] Subdomains { get; set; }
public override bool Cacheable => UriTemplate != null && UriTemplate.StartsWith("http");
public override Uri GetUri(int zoomLevel, int column, int row)
{
Uri uri = null;
@ -103,13 +89,6 @@ namespace MapControl
return uri;
}
public override Task<ImageSource> LoadImageAsync(int zoomLevel, int column, int row)
{
var uri = GetUri(zoomLevel, column, row);
return uri != null ? ImageLoader.LoadImageAsync(uri) : Task.FromResult((ImageSource)null);
}
public override string ToString()
{
return UriTemplate;