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/*
* 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;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.Formatter;
/**
* A view for increasing or decresing zoom
*/
public class ZoomPicker extends LinearLayout {
private final String TAG = "ZoomPicker";
private TextView mText;
private int mZoomMax, mZoomIndex;
private float[] mZoomRatios;
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 Handler mHandler;
private final Runnable mRunnable = new Runnable() {
public void run() {
if (mIncrement) {
if (changeZoomIndex(mZoomIndex + 1)) {
mHandler.postDelayed(this, 65);
}
} else if (mDecrement) {
if (changeZoomIndex(mZoomIndex - 1)) {
mHandler.postDelayed(this, 65);
}
}
}
};
public ZoomPicker(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mHandler = new Handler();
OnTouchListener incrementTouchListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == 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, 200);
}
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mIncrement = false;
}
return false;
}
};
OnTouchListener decrementTouchListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == 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, 200);
}
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mDecrement = false;
}
return false;
}
};
Button incrementButton = (Button) findViewById(R.id.increment);
incrementButton.setOnTouchListener(incrementTouchListener);
Button decrementButton = (Button) findViewById(R.id.decrement);
decrementButton.setOnTouchListener(decrementTouchListener);
mText = (TextView) findViewById(R.id.zoom_ratio);
mText.setText(formatZoomRatio(1.0f));
}
public void setOnZoomChangeListener(OnZoomChangedListener listener) {
mListener = listener;
}
public interface OnZoomChangedListener {
void onZoomChanged(int index);
}
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();
}
private boolean changeZoomIndex(int index) {
if (index > mZoomMax || index < 0) return false;
mZoomIndex = index;
if (mListener != null) {
mListener.onZoomChanged(mZoomIndex);
}
updateView();
return true;
}
private void updateView() {
mText.setText(formatZoomRatio(mZoomRatios[mZoomIndex]));
}
private String formatZoomRatio(float value) {
mFormatterArgs[0] = value;
mBuilder.delete(0, mBuilder.length());
mFormatter.format("%2.1fx", mFormatterArgs);
return mFormatter.toString();
}
}
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