public static void RemoveDrawObjects(this ICanvasDataContext canvasDataContext, ICollection <DrawObject> drawObjects)
{
if (drawObjects == null)
{
throw new ArgumentNullException(nameof(drawObjects));
}
if (drawObjects.Count == 0)
{
return;
}
//激发即将移除事件;
var removingArgs = new CanvasDrawObjectsRemovingEventArgs(drawObjects, canvasDataContext);
CommonEventHelper.Publish <CanvasDrawObjectsRemovingEvent, CanvasDrawObjectsRemovingEventArgs>(removingArgs);
CommonEventHelper.PublishEventToHandlers <ICanvasDrawObjectsRemovingEventHandler, CanvasDrawObjectsRemovingEventArgs>(removingArgs);
//若指示取消或集合为空,则不继续执行;
if (removingArgs.Cancel || removingArgs.RemovingDrawObjects.Count == 0)
{
return;
}
var removingGroups = removingArgs.RemovingDrawObjects.
GroupBy(p => p.Parent as CanvasLayer).Where(p => p.Key != null).ToArray();
void RemoveDrawObjects()
{
try {
foreach (var tuple in removingGroups)
{
tuple.Key.RemoveDrawObjects(tuple);
}
}
catch (Exception ex) {
LoggerService.WriteException(ex);
MsgBoxService.ShowError(ex.Message);
}
}
void AddDrawObjects()
{
try {
foreach (var tuple in removingGroups)
{
tuple.Key.AddDrawObjects(tuple);
}
}
catch (Exception ex) {
LoggerService.WriteException(ex);
MsgBoxService.ShowError(ex.Message);
}
}
RemoveDrawObjects();
var action = new StandardEditTransaction(AddDrawObjects, RemoveDrawObjects);
canvasDataContext.CommitTransaction(action);
}
public static void AddDrawObjects(this ICanvasDataContext canvasDataContext, ICollection <DrawObject> drawObjects)
{
if (drawObjects == null)
{
throw new ArgumentNullException(nameof(drawObjects));
}
if (drawObjects.Count == 0)
{
return;
}
var activeLayer = canvasDataContext.ActiveLayer;
if (activeLayer == null)
{
return;
//throw new InvalidOperationException(LanguageService.FindResourceString(Exception_ActiveLayerCannotBeNull));
}
void AddDrawObjects()
{
activeLayer.AddDrawObjects(drawObjects);
};
void RemoveDrawObjects()
{
activeLayer.RemoveDrawObjects(drawObjects);
}
AddDrawObjects();
var transaction = new StandardEditTransaction(RemoveDrawObjects, AddDrawObjects);
canvasDataContext.CommitTransaction(transaction);
}