using System.Drawing;

using System.Drawing.Imaging;

using GeoAPI.Geometries;

namespace SharpMap.Layers

{

/// <summary>

/// Delegate function definition for handling <see cref="T:SharpMap.Layers.ITileAsyncLayer"/>s <see cref="E:SharpMap.Layers.ITileAsyncLayer.MapNewTileAvaliable"/> event

/// </summary>

/// <param name="sender">The sender</param>

/// <param name="bbox">The bounding box of the tile</param>

/// <param name="bm">The tile bitmap</param>

/// <param name="sourceWidth">The tiles width</param>

/// <param name="sourceHeight">The tiles height</param>

/// <param name="imageAttributes">The <see cref="ImageAttributes"/> to use when rendering the tile</param>

public delegate void MapNewTileAvaliabledHandler(ITileAsyncLayer sender, Envelope bbox, Bitmap bm, int sourceWidth, int sourceHeight, ImageAttributes imageAttributes);

/// <summary>

/// Delegate for notifying download of tiles

/// </summary>

/// <param name="tilesRemaining"></param>

public delegate void DownloadProgressHandler(int tilesRemaining);

/// <summary>

/// Interface for async tile layers

/// </summary>

public interface ITileAsyncLayer

{

/// <summary>

/// Event raised when a new tile is available

/// </summary>

event MapNewTileAvaliabledHandler MapNewTileAvaliable;

/// <summary>

/// Event raised when download progress of tiles has changed

/// </summary>

event DownloadProgressHandler DownloadProgressChanged;

/// <summary>

/// Gets or sets a value indicating if the map only should only be redrawn when all tiles are downloaded

/// </summary>

bool OnlyRedrawWhenComplete { get; set; }

/// <summary>

/// Method to cancel the async layer

/// </summary>

void Cancel();

/// <summary>

/// Returns the number of tiles that are in queue for download

/// </summary>

int NumPendingDownloads { get; }

}

}