1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.android.camera.ui;
import com.android.camera.R;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
/**
* A view that contains camera zoom control which could adjust the zoom in/out
* if the camera supports zooming.
*/
public abstract class ZoomControl extends RelativeLayout implements Rotatable {
// The states of zoom button.
public static final int ZOOM_IN = 0;
public static final int ZOOM_OUT = 1;
public static final int ZOOM_STOP = 2;
private static final String TAG = "ZoomControl";
private static final int ZOOMING_INTERVAL = 1000; // milliseconds
protected ImageView mZoomIn;
protected ImageView mZoomOut;
protected ImageView mZoomSlider;
protected int mOrientation;
private Handler mHandler;
public interface OnZoomChangedListener {
void onZoomValueChanged(int index); // only for immediate zoom
void onZoomStateChanged(int state); // only for smooth zoom
}
// The interface OnZoomIndexChangedListener is used to inform the
// ZoomIndexBar about the zoom index change. The index position is between
// 0 (the index is zero) and 1.0 (the index is mZoomMax).
public interface OnZoomIndexChangedListener {
void onZoomIndexChanged(double indexPosition);
}
protected int mZoomMax, mZoomIndex;
private boolean mSmoothZoomSupported;
private OnZoomChangedListener mListener;
private OnZoomIndexChangedListener mIndexListener;
protected OnIndicatorEventListener mOnIndicatorEventListener;
private int mState;
private int mStep;
protected final Runnable mRunnable = new Runnable() {
public void run() {
performZoom(mState, false);
}
};
public ZoomControl(Context context, AttributeSet attrs) {
super(context, attrs);
mZoomIn = addImageView(context, R.drawable.ic_zoom_in);
mZoomSlider = addImageView(context, R.drawable.ic_zoom_slider);
mZoomOut = addImageView(context, R.drawable.ic_zoom_out);
mHandler = new Handler();
}
public void startZoomControl() {
mZoomSlider.setPressed(true);
setZoomIndex(mZoomIndex); // Update the zoom index bar.
}
protected ImageView addImageView(Context context, int iconResourceId) {
ImageView image = new RotateImageView(context);
image.setImageResource(iconResourceId);
if (iconResourceId == R.drawable.ic_zoom_slider) {
image.setContentDescription(getResources().getString(
R.string.accessibility_zoom_control));
} else {
image.setContentDescription(getResources().getString(
R.string.empty));
}
addView(image);
return image;
}
public void closeZoomControl() {
mZoomSlider.setPressed(false);
stopZooming();
if (!mSmoothZoomSupported) mHandler.removeCallbacks(mRunnable);
if (mOnIndicatorEventListener != null) {
mOnIndicatorEventListener.onIndicatorEvent(
OnIndicatorEventListener.EVENT_LEAVE_ZOOM_CONTROL);
}
}
public void setZoomMax(int zoomMax) {
mZoomMax = zoomMax;
// Layout should be requested as the maximum zoom level is the key to
// show the correct zoom slider position.
requestLayout();
}
public void setOnZoomChangeListener(OnZoomChangedListener listener) {
mListener = listener;
}
public void setOnIndicatorEventListener(OnIndicatorEventListener listener) {
mOnIndicatorEventListener = listener;
}
public void setZoomIndex(int index) {
if (index < 0 || index > mZoomMax) {
throw new IllegalArgumentException("Invalid zoom value:" + index);
}
mZoomIndex = index;
invalidate();
}
public void setSmoothZoomSupported(boolean smoothZoomSupported) {
mSmoothZoomSupported = smoothZoomSupported;
}
private boolean zoomIn() {
return (mZoomIndex == mZoomMax) ? false : changeZoomIndex(mZoomIndex + mStep);
}
private boolean zoomOut() {
return (mZoomIndex == 0) ? false : changeZoomIndex(mZoomIndex - mStep);
}
protected void setZoomStep(int step) {
mStep = step;
}
private void stopZooming() {
if (mSmoothZoomSupported) {
if (mListener != null) mListener.onZoomStateChanged(ZOOM_STOP);
}
}
// Called from ZoomControlWheel to change the zoom level.
// TODO: merge the zoom control for both platforms.
protected void performZoom(int state) {
performZoom(state, true);
}
private void performZoom(int state, boolean fromUser) {
if ((mState == state) && fromUser) return;
if (fromUser) mHandler.removeCallbacks(mRunnable);
mState = state;
switch (state) {
case ZOOM_IN:
zoomIn();
break;
case ZOOM_OUT:
zoomOut();
break;
case ZOOM_STOP:
stopZooming();
break;
}
if (!mSmoothZoomSupported) {
// Repeat the zoom action on tablet as the user is still holding
// the zoom slider.
mHandler.postDelayed(mRunnable, ZOOMING_INTERVAL / mZoomMax);
}
}
// Called from ZoomControlBar to change the zoom level.
protected void performZoom(double zoomPercentage) {
int index = (int) (mZoomMax * zoomPercentage);
if (mZoomIndex == index) return;
changeZoomIndex(index);
}
private boolean changeZoomIndex(int index) {
if (mListener != null) {
if (mSmoothZoomSupported) {
int zoomType = (index < mZoomIndex) ? ZOOM_OUT : ZOOM_IN;
if (((zoomType == ZOOM_IN) && (mZoomIndex != mZoomMax)) ||
((zoomType == ZOOM_OUT) && (mZoomIndex != 0))) {
mListener.onZoomStateChanged(zoomType);
}
} else {
if (index > mZoomMax) index = mZoomMax;
if (index < 0) index = 0;
mListener.onZoomValueChanged(index);
mZoomIndex = index;
}
}
return true;
}
public void setOrientation(int orientation) {
mOrientation = orientation;
int count = getChildCount();
for (int i = 0 ; i < count ; ++i) {
View view = getChildAt(i);
if (view instanceof RotateImageView) {
((RotateImageView) view).setOrientation(orientation);
}
}
}
@Override
public void setActivated(boolean activated) {
super.setActivated(activated);
mZoomIn.setActivated(activated);
mZoomOut.setActivated(activated);
}
}
|
