// Copyright 2012 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.collide.shared.document.anchor;
import com.google.collide.json.shared.JsonArray;
import com.google.collide.shared.util.JsonCollections;
/**
* Helper class to defer the dispatching of anchor callbacks until state has
* stabilized.
*/
class AnchorDeferredDispatcher {
private JsonArray<Anchor> shiftedAnchors;
private JsonArray<Anchor> removedAnchors;
void deferDispatchShifted(Anchor anchor) {
if (removedAnchors != null && removedAnchors.contains(anchor)) {
// Anchor has been removed, don't dispatch shift
return;
}
if (shiftedAnchors == null) {
shiftedAnchors = JsonCollections.createArray();
}
shiftedAnchors.add(anchor);
}
void deferDispatchRemoved(Anchor anchor) {
if (removedAnchors == null) {
removedAnchors = JsonCollections.createArray();
}
removedAnchors.add(anchor);
// Anchor has been removed, don't dispatch these
if (shiftedAnchors != null) {
shiftedAnchors.remove(anchor);
}
}
JsonArray<Anchor> getShiftedAnchors() {
return shiftedAnchors;
}
void dispatch() {
if (shiftedAnchors != null) {
for (int i = 0, n = shiftedAnchors.size(); i < n; i++) {
shiftedAnchors.get(i).dispatchShifted();
}
}
if (removedAnchors != null) {
for (int i = 0, n = removedAnchors.size(); i < n; i++) {
removedAnchors.get(i).dispatchRemoved();
}
}
}
}