/// <inheritdoc />
public override bool Select(Envelope tolerant, Envelope strict, SelectionMode mode, out Envelope affectedArea, ClearStates clear)
{
affectedArea = new Envelope();
bool somethingChanged = false;
IgnoreSelectionChanged = true;
MapFrame.SuspendEvents();
foreach (var s in GetAllLayers().Where(_ => _.SelectionEnabled && _.IsVisible))
{
Envelope layerArea;
if (s.Select(tolerant, strict, mode, out layerArea, clear))
{
somethingChanged = true;
affectedArea.ExpandToInclude(layerArea);
}
}
IgnoreSelectionChanged = false;
MapFrame.ResumeEvents();
OnSelectionChanged(); // fires only AFTER the individual layers have fired their events.
return(somethingChanged);
}
/// <summary>
/// Highlights the values in the specified region, and returns the affected area from the selection,
/// which should allow for slightly faster drawing in cases where only a small area is changed.
/// </summary>
/// <param name="self">The IFeatureLayer from which to select features</param>
/// <param name="tolerant">The geographic envelope in cases like cliking near points where tolerance is allowed</param>
/// <param name="strict">The geographic region when working with absolutes, without a tolerance</param>
/// <param name="affectedArea">The geographic envelope of the region impacted by the selection.</param>
/// <param name="clear">Indicates whether prior selected features should be cleared.</param>
/// <returns>True if any members were added to the current selection.</returns>
public static bool Select(this IFeatureLayer self, Envelope tolerant, Envelope strict, out Envelope affectedArea, ClearStates clear)
{
return(self.Select(tolerant, strict, SelectionMode.Intersects, out affectedArea, clear));
}
/// <summary>
/// This is overriden in sub-classes
/// </summary>
/// <param name="tolerant">The geographic envelope in cases like cliking near points where tolerance is allowed</param>
/// <param name="strict">The geographic region when working with absolutes, without a tolerance</param>
/// <param name="mode">The selection mode.</param>
/// <param name="affectedArea">The affected area.</param>
/// <param name="clear">Indicates whether prior selected features should be cleared.</param>
/// <returns>False.</returns>
public virtual bool Select(Envelope tolerant, Envelope strict, SelectionMode mode, out Envelope affectedArea, ClearStates clear)
{
affectedArea = null;
return(false);
}
/// <summary>
/// This ignores the affected region and assumes that you want to use a selection based on
/// the Intersects selection mode.
/// </summary>
/// <param name="self">This ISelectable</param>
/// <param name="tolerant">The geographic envelope in cases like cliking near points where tolerance is allowed</param>
/// <param name="strict">The geographic region when working with absolutes, without a tolerance</param>
/// <param name="clear">Indicates whether prior selected features should be cleared.</param>
/// <returns>Boolean, true if any items were added to the selection</returns>
public static bool Select(this ISelectable self, Envelope tolerant, Envelope strict, ClearStates clear)
{
Envelope ignoreMe;
return(self.Select(tolerant, strict, SelectionMode.Intersects, out ignoreMe, clear));
}
