/// <summary>
/// Removes all xMapServer base layers.
/// </summary>
/// <param name="layers"> The LayerCollection instance. </param>
public static void RemoveXMapBaseLayers(this LayerCollection layers)
{
var idx = layers.IndexOf(layers[BackgroundLayerName]);
BaseLayerSuccessor = layers.Count > idx + 1 ? layers[idx + 1].Name : null;
idx = layers.IndexOf(layers[LabelsLayerName]);
LabelLayerPredecessor = idx > 0 ? layers[idx - 1].Name : null;
layers.Remove(layers[BackgroundLayerName]);
layers.Remove(layers[LabelsLayerName]);
}
public static bool HasNonBasemapLayerBeforeAfterIndex(Layer layer, LayerCollection collection, bool before)
{
if (layer == null || collection == null)
return false;
int index = collection.IndexOf(layer);
if (index < 0) //layer not found
return false;
if (before)
{
for(int i = index - 1; i >= 0; i--)
{
if (!(bool)collection[i].GetValue(ESRI.ArcGIS.Client.WebMap.Document.IsBaseMapProperty))
return true;
}
}
else
{
if (index < collection.Count - 1)
{
for (int i = index + 1; i < collection.Count; i++)
{
if (!(bool)collection[i].GetValue(ESRI.ArcGIS.Client.WebMap.Document.IsBaseMapProperty))
return true;
}
}
}
return false;
}
/// <summary>
/// Inserts the xMapServer base layers, i.e. the background layers for areas like forests, rivers, population areas, et al,
/// and their corresponding labels.
/// </summary>
/// <param name="layers">The LayerCollection instance, used as an extension. </param>
/// <param name="meta">Meta information for xMapServer, further details can be seen in the <see cref="XMapMetaInfo"/> description. </param>
public static void InsertXMapBaseLayers(this LayerCollection layers, XMapMetaInfo meta)
{
var baseLayer = new TiledLayer(BackgroundLayerName)
{
TiledProvider = new XMapTiledProvider(meta.Url, meta.User, meta.Password, XMapMode.Background),
Copyright = meta.CopyrightText,
Caption = MapLocalizer.GetString(MapStringId.Background),
IsBaseMapLayer = true,
Icon = ResourceHelper.LoadBitmapFromResource("Ptv.XServer.Controls.Map;component/Resources/Background.png")
};
if (BaseLayerSuccessor != null && layers[BaseLayerSuccessor] != null)
{
layers.Insert(layers.IndexOf(layers[BaseLayerSuccessor]), baseLayer);
}
else
{
// add tile layer
layers.Add(baseLayer);
BaseLayerSuccessor = null;
}
// don't add overlay layer for Decarta-powered maps (basemap is completely rendered on tiles)
if (XServerUrl.IsDecartaBackend(meta.Url))
{
return;
}
var labelLayer = new UntiledLayer(LabelsLayerName)
{
UntiledProvider = new XMapTiledProvider(meta.Url, meta.User, meta.Password, XMapMode.Town),
MaxRequestSize = meta.MaxRequestSize,
Caption = MapLocalizer.GetString(MapStringId.Labels),
Icon = ResourceHelper.LoadBitmapFromResource("Ptv.XServer.Controls.Map;component/Resources/Labels.png")
};
if (LabelLayerPredecessor != null && layers[LabelLayerPredecessor] != null && layers.IndexOf(layers[LabelLayerPredecessor]) < layers.Count)
{
layers.Insert(layers.IndexOf(layers[LabelLayerPredecessor]) + 1, labelLayer);
}
else
{
// add label layer
layers.Add(labelLayer);
LabelLayerPredecessor = null;
}
}
public void PromoteLayer(Layer selectedLayer)
{
// Find the collection the layer is in.
LayerCollection owningCollection = IncludedLayers.Contains(selectedLayer) ? IncludedLayers : ExcludedLayers;
// Get the current index (position) of the layer.
int layerIndex = owningCollection.IndexOf(selectedLayer);
// Skip if the layer can't be moved because it is already at the top.
if (layerIndex < 1)
{
return;
}
// Move the layer by removing it and re-adding it at its old position minus 1.
owningCollection.Remove(selectedLayer);
owningCollection.Insert(layerIndex - 1, selectedLayer);
}
public static bool HasNonBasemapLayerBeforeAfterIndex(Layer layer, LayerCollection collection, bool before)
{
if (layer == null || collection == null)
{
return(false);
}
int index = collection.IndexOf(layer);
if (index < 0) //layer not found
{
return(false);
}
if (before)
{
for (int i = index - 1; i >= 0; i--)
{
if (!(bool)collection[i].GetValue(ESRI.ArcGIS.Client.WebMap.Document.IsBaseMapProperty))
{
return(true);
}
}
}
else
{
if (index < collection.Count - 1)
{
for (int i = index + 1; i < collection.Count; i++)
{
if (!(bool)collection[i].GetValue(ESRI.ArcGIS.Client.WebMap.Document.IsBaseMapProperty))
{
return(true);
}
}
}
}
return(false);
}
// when layers are added/removed
private void Layers_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
LayerCollection layers = (LayerCollection)sender;
// Put updating of measurable layers in a throttle timer, meaning that this logic will
// only be invoked once if the CollectionChanged event fires multiple times within two
// tenths of a second. This is necessary because changing to a basemap in a different
// spatial reference results in clearing and rebuilding the layers collection.
if (_updateMeasurableLayersThrottler == null)
{
_updateMeasurableLayersThrottler = new ThrottleTimer(20, () =>
{
// Check whether all layers are initialized
if (layers.Any(l => !l.IsInitialized))
{
layers.LayersInitialized += Layers_LayersInitialized; // Wait for initialization
}
else
{
UpdateMeasurableLayers(); // Update measurable layers collection now
}
});
}
_updateMeasurableLayersThrottler.Invoke();
// Check whether layers were added
if (e.NewItems != null)
{
// Hook into visibility changed events for added layers
foreach (Layer layer in e.NewItems)
{
layer.PropertyChanged += Layer_PropertyChanged;
if (layer is ArcGISDynamicMapServiceLayer)
{
ISublayerVisibilitySupport subLayerSupport = layer as ISublayerVisibilitySupport;
subLayerSupport.VisibilityChanged += SubLayerSupport_VisibilityChanged;
}
}
}
// Check whether layers were removed
if (e.OldItems != null)
{
// Unhook from visibility changed events for removed layers
foreach (Layer layer in e.OldItems)
{
layer.PropertyChanged -= Layer_PropertyChanged;
if (layer is ArcGISDynamicMapServiceLayer)
{
ISublayerVisibilitySupport subLayerSupport = layer as ISublayerVisibilitySupport;
subLayerSupport.VisibilityChanged -= SubLayerSupport_VisibilityChanged;
}
}
}
// If draw layer has been added to the map, check whether it is the top-most
if (layers.Contains(DrawLayer) && layers.IndexOf(DrawLayer) != layers.Count - 1)
{
// Draw layer is not top-most. Move it to the top by removing and re-adding it. Wrap in
// a begin invoke call so the collection is modified outside the CollectionChanged event.
Map.Dispatcher.BeginInvoke(() =>
{
layers.Remove(DrawLayer);
layers.Add(DrawLayer);
});
}
}