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.content.Context;
20import android.graphics.Canvas;
21import android.view.MotionEvent;
22
23public abstract class OverlayRenderer implements RenderOverlay.Renderer {
24
25    private static final String TAG = "CAM OverlayRenderer";
26    protected RenderOverlay mOverlay;
27
28    protected int mLeft, mTop, mRight, mBottom;
29
30    protected boolean mVisible;
31
32    public void setVisible(boolean vis) {
33        mVisible = vis;
34        update();
35    }
36
37    public boolean isVisible() {
38        return mVisible;
39    }
40
41    // default does not handle touch
42    @Override
43    public boolean handlesTouch() {
44        return false;
45    }
46
47    @Override
48    public boolean onTouchEvent(MotionEvent evt) {
49        return false;
50    }
51
52    public abstract void onDraw(Canvas canvas);
53
54    public void draw(Canvas canvas) {
55        if (mVisible) {
56            onDraw(canvas);
57        }
58    }
59
60    @Override
61    public void setOverlay(RenderOverlay overlay) {
62        mOverlay = overlay;
63    }
64
65    @Override
66    public void layout(int left, int top, int right, int bottom) {
67        mLeft = left;
68        mRight = right;
69        mTop = top;
70        mBottom = bottom;
71    }
72
73    protected Context getContext() {
74        if (mOverlay != null) {
75            return mOverlay.getContext();
76        } else {
77            return null;
78        }
79    }
80
81    public int getWidth() {
82        return mRight - mLeft;
83    }
84
85    public int getHeight() {
86        return mBottom - mTop;
87    }
88
89    protected void update() {
90        if (mOverlay != null) {
91            mOverlay.update();
92        }
93    }
94
95}
96