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
|
/*
* Copyright (C) 2010 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.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.TextView;
import java.util.Formatter;
/**
* A class to increase or decrease zoom
*/
public class ZoomPicker {
private final String TAG = "ZoomPicker";
private TextView mZoomTextView;
private int mZoomMax, mZoomIndex;
private float[] mZoomRatios;
private boolean mSmoothZoomSupported;
private OnZoomChangedListener mListener;
private boolean mIncrement, mDecrement;
private final StringBuilder mBuilder = new StringBuilder();
private final Formatter mFormatter = new Formatter(mBuilder);
private final Object[] mFormatterArgs = new Object[1];
private String mZoomText;
private View mIncrementButton;
private View mDecrementButton;
// The state 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 Handler mHandler;
private final Runnable mRunnable = new Runnable() {
public void run() {
if (mIncrement) {
if (mSmoothZoomSupported) {
if (mZoomIndex != mZoomMax && mListener != null) {
mListener.onZoomStateChanged(ZOOM_IN);
}
} else if (changeZoomIndex(mZoomIndex + 1)) {
mHandler.postDelayed(this, 65);
}
} else if (mDecrement) {
if (mSmoothZoomSupported) {
if (mZoomIndex != 0 && mListener != null) {
mListener.onZoomStateChanged(ZOOM_OUT);
}
} else if (changeZoomIndex(mZoomIndex - 1)) {
mHandler.postDelayed(this, 65);
}
}
}
};
public ZoomPicker(Context context, View increment, View decrement, TextView zoomText) {
mZoomText = context.getString(R.string.zoom_text);
mHandler = new Handler();
OnTouchListener incrementTouchListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
if (!mIncrement && changeZoomIndex(mZoomIndex + 1)) {
mIncrement = true;
// Give bigger delay so users can tap to change only one
// zoom step.
mHandler.postDelayed(mRunnable, 300);
}
} else if (action == MotionEvent.ACTION_UP
|| action == MotionEvent.ACTION_CANCEL) {
mIncrement = false;
if (mSmoothZoomSupported) {
if (mListener != null) mListener.onZoomStateChanged(ZOOM_STOP);
}
}
return false;
}
};
OnTouchListener decrementTouchListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
if (!mDecrement && changeZoomIndex(mZoomIndex - 1)) {
mDecrement = true;
// Give bigger delay so users can tap to change only one
// zoom step.
mHandler.postDelayed(mRunnable, 300);
}
} else if (action == MotionEvent.ACTION_UP
|| action == MotionEvent.ACTION_CANCEL) {
mDecrement = false;
if (mSmoothZoomSupported) {
if (mListener != null) mListener.onZoomStateChanged(ZOOM_STOP);
}
}
return false;
}
};
mIncrementButton = increment;
mIncrementButton.setOnTouchListener(incrementTouchListener);
mIncrementButton.setVisibility(View.VISIBLE);
mDecrementButton = decrement;
mDecrementButton.setOnTouchListener(decrementTouchListener);
mDecrementButton.setVisibility(View.VISIBLE);
mZoomTextView = zoomText;
}
public void setOnZoomChangeListener(OnZoomChangedListener listener) {
mListener = listener;
}
public interface OnZoomChangedListener {
void onZoomValueChanged(int index); // only for immediate zoom
void onZoomStateChanged(int state); // only for smooth zoom
}
public void setZoomRatios(float[] zoomRatios) {
mZoomMax = zoomRatios.length - 1;
mZoomRatios = zoomRatios;
updateView();
}
public void setZoomIndex(int index) {
if (index < 0 || index > mZoomMax) {
throw new IllegalArgumentException("Invalid zoom value:" + index);
}
mZoomIndex = index;
updateView();
}
public void setSmoothZoomSupported(boolean smoothZoomSupported) {
mSmoothZoomSupported = smoothZoomSupported;
}
private boolean changeZoomIndex(int index) {
if (index > mZoomMax || index < 0) return false;
mZoomIndex = index;
if (mListener != null) {
mListener.onZoomValueChanged(mZoomIndex);
}
updateView();
return true;
}
private void updateView() {
if (mZoomTextView == null) return;
if (mZoomIndex == 0) {
mZoomTextView.setVisibility(View.INVISIBLE);
} else {
mZoomTextView.setText(String.format(mZoomText, formatZoomRatio(mZoomRatios[mZoomIndex])));
mZoomTextView.setVisibility(View.VISIBLE);
}
}
private String formatZoomRatio(float value) {
mFormatterArgs[0] = value;
mBuilder.delete(0, mBuilder.length());
mFormatter.format("%2.1fx", mFormatterArgs);
return mFormatter.toString();
}
public void setEnabled(boolean enabled) {
mIncrementButton.setEnabled(enabled);
mDecrementButton.setEnabled(enabled);
}
}
|
