private void UpdateLayerSettings(Layer layer)
{
if (layer == null || !IsLayerAutoUpdateCapable(layer))
{
return;
}
// find the helper that manages the auto-update for this layer
LayerAutoUpdateHelper helper = null;
_autoUpdateHelpersDict.TryGetValue(layer, out helper);
if (helper == null)
{
// All FeatureLayers need a helper created for them in case the user
// chooses to enable the layer's auto-update at a later time
helper = new LayerAutoUpdateHelper {
FilteredLayer = layer, ParentBehavior = this, IsEnabled = layer.Visible
};
// Add to lookup dictionary
_autoUpdateHelpersDict.Add(layer, helper);
//clear all listeners and their event subscriptions
ClearPropertyListeners(layer);
// Set the layer's property changed delegate to point to our method
DependencyProperty listener = Utility.NotifyOnAttachedPropertyChanged("AutoUpdateInterval", layer, OnLayerPropertyChanged, LayerExtensions.GetAutoUpdateInterval(layer));
if (!autoUpdateIntervalProps.ContainsKey(layer))
{
autoUpdateIntervalProps.Add(layer, listener);
}
else
{
autoUpdateIntervalProps[layer] = listener;
}
// We also want to know when the layer visibility is changed so that we can
// stop the refresh timers
listener = Utility.NotifyOnAttachedPropertyChanged("Visible", layer, OnLayerVisibilityChanged, layer.Visible);
if (!visibleProps.ContainsKey(layer))
{
visibleProps.Add(layer, listener);
}
else
{
visibleProps[layer] = listener;
}
}
helper.SettingsHaveChanged();
}
/// <summary>
/// Callback method for when the layer visibility is changed (ex: when the user unchecks the layer
/// checkbox in Map Contents.
/// </summary>
public void OnLayerVisibilityChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var layer = o as Layer;
if (layer == null)
{
return;
}
LayerAutoUpdateHelper helper = null;
_autoUpdateHelpersDict.TryGetValue(layer, out helper);
if (helper != null)
{
helper.IsEnabled = layer.Visible;
}
}
