1/*
2 * Copyright (C) 2008 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 android.widget;
18
19import android.annotation.Widget;
20import android.content.Context;
21import android.util.AttributeSet;
22import android.view.LayoutInflater;
23import android.view.MotionEvent;
24import android.view.View;
25import android.view.animation.AlphaAnimation;
26
27import com.android.internal.R;
28
29
30/**
31 * The {@code ZoomControls} class displays a simple set of controls used for zooming and
32 * provides callbacks to register for events. */
33@Widget
34public class ZoomControls extends LinearLayout {
35
36    private final ZoomButton mZoomIn;
37    private final ZoomButton mZoomOut;
38
39    public ZoomControls(Context context) {
40        this(context, null);
41    }
42
43    public ZoomControls(Context context, AttributeSet attrs) {
44        super(context, attrs);
45        setFocusable(false);
46
47        LayoutInflater inflater = (LayoutInflater) context
48                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
49        inflater.inflate(R.layout.zoom_controls, this, // we are the parent
50                true);
51
52        mZoomIn = (ZoomButton) findViewById(R.id.zoomIn);
53        mZoomOut = (ZoomButton) findViewById(R.id.zoomOut);
54    }
55
56    public void setOnZoomInClickListener(OnClickListener listener) {
57        mZoomIn.setOnClickListener(listener);
58    }
59
60    public void setOnZoomOutClickListener(OnClickListener listener) {
61        mZoomOut.setOnClickListener(listener);
62    }
63
64    /*
65     * Sets how fast you get zoom events when the user holds down the
66     * zoom in/out buttons.
67     */
68    public void setZoomSpeed(long speed) {
69        mZoomIn.setZoomSpeed(speed);
70        mZoomOut.setZoomSpeed(speed);
71    }
72
73    @Override
74    public boolean onTouchEvent(MotionEvent event) {
75
76        /* Consume all touch events so they don't get dispatched to the view
77         * beneath this view.
78         */
79        return true;
80    }
81
82    public void show() {
83        fade(View.VISIBLE, 0.0f, 1.0f);
84    }
85
86    public void hide() {
87        fade(View.GONE, 1.0f, 0.0f);
88    }
89
90    private void fade(int visibility, float startAlpha, float endAlpha) {
91        AlphaAnimation anim = new AlphaAnimation(startAlpha, endAlpha);
92        anim.setDuration(500);
93        startAnimation(anim);
94        setVisibility(visibility);
95    }
96
97    public void setIsZoomInEnabled(boolean isEnabled) {
98        mZoomIn.setEnabled(isEnabled);
99    }
100
101    public void setIsZoomOutEnabled(boolean isEnabled) {
102        mZoomOut.setEnabled(isEnabled);
103    }
104
105    @Override
106    public boolean hasFocus() {
107        return mZoomIn.hasFocus() || mZoomOut.hasFocus();
108    }
109
110    @Override
111    public CharSequence getAccessibilityClassName() {
112        return ZoomControls.class.getName();
113    }
114}
115