LayoutChangeHelper.java revision dac1bb32531f7f4d49622bd38c82dde9333c38ac 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.camera.ui;
18
19import android.view.View;
20
21public class LayoutChangeHelper implements LayoutChangeNotifier {
22    private LayoutChangeNotifier.Listener mListener;
23    private boolean mFirstTimeLayout;
24    private View mView;
25
26    public LayoutChangeHelper(View v) {
27        mView = v;
28        mFirstTimeLayout = true;
29    }
30
31    @Override
32    public void setOnLayoutChangeListener(LayoutChangeNotifier.Listener listener) {
33        mListener = listener;
34    }
35
36    public void onLayout(boolean changed, int l, int t, int r, int b) {
37        if (mListener == null) return;
38        if (mFirstTimeLayout || changed) {
39            mFirstTimeLayout = false;
40            mListener.onLayoutChange(mView, l, t, r, b);
41        }
42    }
43}
44