/// <summary>
/// This occurs during the Copy method and is overridable by sub-classes
/// </summary>
/// <param name="copy">The duplicate descriptor</param>
protected virtual void OnCopy(Descriptor copy)
{
// This checks any property on copy, and if it is cloneable, it
// creates a clone instead
Type copyType = copy.GetType();
PropertyInfo[] copyProperties = DistinctNames(copyType.GetProperties(BindingFlags.Public | BindingFlags.Instance));
PropertyInfo[] myProperties = DistinctNames(GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance));
foreach (PropertyInfo p in copyProperties)
{
if (p.CanWrite == false) continue;
if (myProperties.Contains(p.Name) == false) continue;
PropertyInfo myProperty = myProperties.GetFirst(p.Name);
object myValue = myProperty.GetValue(this, null);
if (myProperty.GetCustomAttributes(typeof(ShallowCopy), true).Length > 0)
{
// This property is marked as shallow, so skip cloning it
continue;
}
ICloneable cloneable = myValue as ICloneable;
if (cloneable == null) continue;
p.SetValue(copy, cloneable.Clone(), null);
}
FieldInfo[] copyFields = copyType.GetFields(BindingFlags.Public | BindingFlags.Instance);
FieldInfo[] myFields = GetType().GetFields(BindingFlags.Public | BindingFlags.Instance);
foreach (FieldInfo f in copyFields)
{
if (myFields.Contains(f.Name) == false) continue;
FieldInfo myField = myFields.GetFirst(f.Name);
object myValue = myField.GetValue(copy);
if (myField.GetCustomAttributes(typeof(ShallowCopy), true).Length > 0)
{
// This field is marked as shallow, so skip cloning it
continue;
}
ICloneable cloneable = myValue as ICloneable;
if (cloneable == null) continue;
f.SetValue(copy, cloneable.Clone());
}
}
/// <summary>
/// special treatment for event handlers during a copy event
/// </summary>
/// <param name="copy"></param>
protected override void OnCopy(Descriptor copy)
{
// Remove event handlers from the copy. (They will be set again when adding to a new map.)
Layer copyLayer = copy as Layer;
if (copyLayer == null) return;
if (copyLayer.LayerSelected != null)
{
foreach (var handler in copyLayer.LayerSelected.GetInvocationList())
{
copyLayer.LayerSelected -= (EventHandler<LayerSelectedEventArgs>)handler;
}
}
if (copyLayer.ZoomToLayer != null)
{
foreach (var handler in copyLayer.ZoomToLayer.GetInvocationList())
{
copyLayer.ZoomToLayer -= (EventHandler<EnvelopeArgs>)handler;
}
}
if (copyLayer.ShowProperties != null)
{
foreach (var handler in copyLayer.ShowProperties.GetInvocationList())
{
copyLayer.ShowProperties -= (HandledEventHandler)handler;
}
}
if (copyLayer.FinishedLoading != null)
{
foreach (var handler in copyLayer.FinishedLoading.GetInvocationList())
{
copyLayer.FinishedLoading -= (EventHandler)handler;
}
}
if (copyLayer.SelectionChanged != null)
{
foreach (var handler in copyLayer.SelectionChanged.GetInvocationList())
{
copyLayer.SelectionChanged -= (EventHandler)handler;
}
}
base.OnCopy(copy);
}
/// <summary>
/// Handles updating event handlers during a copy process
/// </summary>
/// <param name="copy"></param>
protected override void OnCopy(Descriptor copy)
{
LegendItem myCopy = copy as LegendItem;
if (myCopy != null && myCopy.ItemChanged != null)
{
foreach (Delegate handler in myCopy.ItemChanged.GetInvocationList())
{
myCopy.ItemChanged -= (EventHandler)handler;
}
}
if (myCopy != null && myCopy.RemoveItem != null)
{
foreach (Delegate handler in myCopy.RemoveItem.GetInvocationList())
{
myCopy.RemoveItem -= (EventHandler)handler;
}
}
base.OnCopy(copy);
}
/// <summary>
/// Occurs during a copy operation and handles removing surplus event handlers
/// </summary>
/// <param name="copy">
/// </param>
protected override void OnCopy(Descriptor copy)
{
// Remove event handlers from the copy (since Memberwise clone also clones handlers.)
FeatureLayer flCopy = copy as FeatureLayer;
if (flCopy == null)
{
return;
}
if (flCopy.ViewAttributes != null)
{
foreach (var handler in flCopy.ViewAttributes.GetInvocationList())
{
flCopy.ViewAttributes -= (HandledEventHandler)handler;
}
}
if (flCopy.LabelSetup != null)
{
foreach (var handler in flCopy.LabelSetup.GetInvocationList())
{
flCopy.LabelSetup -= (HandledEventHandler)handler;
}
}
if (flCopy.SnapShotTaken != null)
{
foreach (var handler in flCopy.SnapShotTaken.GetInvocationList())
{
flCopy.SnapShotTaken -= (EventHandler<SnapShotEventArgs>)handler;
}
}
if (flCopy.SchemeApplied != null)
{
foreach (var handler in flCopy.SchemeApplied.GetInvocationList())
{
flCopy.SchemeApplied -= (EventHandler)handler;
}
}
base.OnCopy(copy);
}
/// <summary>
/// Special handling of not copying the parent during a copy operation
/// </summary>
/// <param name="copy"></param>
protected override void OnCopy(Descriptor copy)
{
FeatureScheme scheme = copy as FeatureScheme;
if (scheme != null && scheme.SelectFeatures != null)
{
foreach (var handler in scheme.SelectFeatures.GetInvocationList())
{
scheme.SelectFeatures -= (EventHandler<ExpressionEventArgs>)handler;
}
}
// Disconnecting the parent prevents the immediate application of copied scheme categories to the original layer.
SuspendEvents();
base.OnCopy(copy);
ResumeEvents();
}
/// <summary>
/// Makes it so that if there are any pre-existing listeners to the SelectFeatuers
/// event when creating a clone of this object, those listeners are removed.
/// They should be added correctly when the cloned item is added to the collection,
/// after being cloned.
/// </summary>
/// <param name="copy"></param>
protected override void OnCopy(Descriptor copy)
{
//todo: do the same for DeselectFeatures event...
FeatureCategory cat = copy as FeatureCategory;
if (cat != null && cat.SelectFeatures != null)
{
foreach (var handler in cat.SelectFeatures.GetInvocationList())
{
cat.SelectFeatures -= (EventHandler<ExpressionEventArgs>)handler;
}
}
if (cat != null)
{
cat.CreateContextMenuItems();
}
base.OnCopy(copy);
}
/// <summary>
/// This helps the copy process by preparing the internal variables AFTER memberwiseclone has created this
///
/// </summary>
/// <param name="copy"></param>
protected override void OnCopy(Descriptor copy)
{
// Setting the image property has a built in check to dispose the older reference.
// After a MemberwiseClone, however, this older reference is still in use in the original PictureSymbol.
// We must, therefore, set the private variables to null before doing the cloning.
PictureSymbol duplicate = copy as PictureSymbol;
if (duplicate != null)
{
duplicate._image = null;
duplicate._original = null;
}
base.OnCopy(copy);
if (duplicate != null)
{
duplicate._image = _image.Copy();
duplicate._original = _original.Copy();
}
}
