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Automatic default WMS Layer

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This commit is contained in:
ClemensF 2020-04-19 12:47:39 +02:00
parent c915860eff
commit 7cd1ccddc1
2 changed files with 80 additions and 55 deletions
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85
MapControl/Shared/WmsImageLayer.cs
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@ -19,6 +19,9 @@ using System.Windows.Media;
namespace MapControl
{
/// <summary>
/// Displays a single map image from a Web Map Service (WMS).
/// </summary>
public partial class WmsImageLayer : MapImageLayer
{
public static readonly DependencyProperty ServiceUriProperty = DependencyProperty.Register(
@ -27,7 +30,7 @@ namespace MapControl
public static readonly DependencyProperty LayersProperty = DependencyProperty.Register(
nameof(Layers), typeof(string), typeof(WmsImageLayer),
new PropertyMetadata(string.Empty, async (o, e) => await ((WmsImageLayer)o).UpdateImageAsync()));
new PropertyMetadata(null, async (o, e) => await ((WmsImageLayer)o).UpdateImageAsync()));
public static readonly DependencyProperty StylesProperty = DependencyProperty.Register(
nameof(Styles), typeof(string), typeof(WmsImageLayer),
@ -37,24 +40,36 @@ namespace MapControl
nameof(Format), typeof(string), typeof(WmsImageLayer),
new PropertyMetadata("image/png", async (o, e) => await ((WmsImageLayer)o).UpdateImageAsync()));
/// <summary>
/// The base request URL.
/// </summary>
public Uri ServiceUri
{
get { return (Uri)GetValue(ServiceUriProperty); }
set { SetValue(ServiceUriProperty, value); }
}
/// <summary>
/// Comma-separated list of Layer names to be displayed. If not set, the first Layer is displayed.
/// </summary>
public string Layers
{
get { return (string)GetValue(LayersProperty); }
set { SetValue(LayersProperty, value); }
}
/// <summary>
/// Comma-separated list of requested styles. Default is an empty string.
/// </summary>
public string Styles
{
get { return (string)GetValue(StylesProperty); }
set { SetValue(StylesProperty, value); }
}
/// <summary>
/// Requested image format. Default is image/png.
/// </summary>
public string Format
{
get { return (string)GetValue(FormatProperty); }
@ -64,36 +79,19 @@ namespace MapControl
/// <summary>
/// Gets a list of all layer names returned by a GetCapabilities response.
/// </summary>
public async Task<List<string>> GetLayerNamesAsync()
public async Task<IEnumerable<string>> GetLayerNamesAsync()
{
List<string> layerNames = null;
IEnumerable<string> layerNames = null;
var capabilities = await GetCapabilities();
if (ServiceUri != null)
if (capabilities != null)
{
var uri = GetRequestUri("GetCapabilities").Replace(" ", "%20");
var ns = capabilities.Name.Namespace;
try
{
XElement capabilities;
using (var stream = await ImageLoader.HttpClient.GetStreamAsync(uri))
{
capabilities = XDocument.Load(stream).Root;
}
var ns = capabilities.Name.Namespace;
layerNames = capabilities
.Descendants(ns + "Layer")
.Where(e => e.Attribute("queryable")?.Value == "1")
.Select(e => e.Element(ns + "Name")?.Value)
.Where(n => !string.IsNullOrEmpty(n))
.ToList();
}
catch (Exception ex)
{
Debug.WriteLine("WmsImageLayer: {0}: {1}", uri, ex.Message);
}
layerNames = capabilities
.Descendants(ns + "Layer")
.Select(e => e.Element(ns + "Name")?.Value)
.Where(n => !string.IsNullOrEmpty(n));
}
return layerNames;
@ -104,6 +102,13 @@ namespace MapControl
/// </summary>
protected override async Task<ImageSource> GetImageAsync()
{
if (Layers == null && // get first Layer
ServiceUri != null &&
ServiceUri.ToString().IndexOf("LAYERS=", StringComparison.OrdinalIgnoreCase) < 0)
{
Layers = (await GetLayerNamesAsync())?.FirstOrDefault() ?? "";
}
var uri = GetImageUri();
return uri != null
@ -170,5 +175,31 @@ namespace MapControl
return uri + "REQUEST=" + request;
}
private async Task<XElement> GetCapabilities()
{
XElement capabilities = null;
if (ServiceUri != null)
{
var uri = GetRequestUri("GetCapabilities").Replace(" ", "%20");
try
{
using (var stream = await ImageLoader.HttpClient.GetStreamAsync(uri))
{
capabilities = XDocument.Load(stream).Root;
}
var ns = capabilities.Name.Namespace;
}
catch (Exception ex)
{
Debug.WriteLine("WmsImageLayer: {0}: {1}", uri, ex.Message);
}
}
return capabilities;
}
}
}