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/*
* Copyright (C) 2009 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.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
public class Switcher extends ImageView implements View.OnTouchListener {
@SuppressWarnings("unused")
private static final String TAG = "Switcher";
public interface OnSwitchListener {
// Returns true if the listener agrees that the switch can be changed.
public boolean onSwitchChanged(Switcher source, boolean onOff);
}
private static final int ANIMATION_SPEED = 200;
private static final long NO_ANIMATION = -1;
private boolean mSwitch = false;
private int mPosition = 0;
private long mAnimationStartTime = 0;
private int mAnimationStartPosition;
private OnSwitchListener mListener;
public Switcher(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setSwitch(boolean onOff) {
if (mSwitch == onOff) return;
mSwitch = onOff;
invalidate();
}
// Try to change the switch position. (The client can veto it.)
private void tryToSetSwitch(boolean onOff) {
try {
if (mSwitch == onOff) return;
if (mListener != null) {
if (!mListener.onSwitchChanged(this, onOff)) {
return;
}
}
mSwitch = onOff;
} finally {
startParkingAnimation();
}
}
public void setOnSwitchListener(OnSwitchListener listener) {
mListener = listener;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) return false;
final int available = getHeight() - mPaddingTop - mPaddingBottom
- getDrawable().getIntrinsicHeight();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mAnimationStartTime = NO_ANIMATION;
setPressed(true);
trackTouchEvent(event);
break;
case MotionEvent.ACTION_MOVE:
trackTouchEvent(event);
break;
case MotionEvent.ACTION_UP:
trackTouchEvent(event);
tryToSetSwitch(mPosition >= available / 2);
setPressed(false);
break;
case MotionEvent.ACTION_CANCEL:
tryToSetSwitch(mSwitch);
setPressed(false);
break;
}
return true;
}
private void startParkingAnimation() {
mAnimationStartTime = AnimationUtils.currentAnimationTimeMillis();
mAnimationStartPosition = mPosition;
}
private void trackTouchEvent(MotionEvent event) {
Drawable drawable = getDrawable();
int drawableHeight = drawable.getIntrinsicHeight();
final int height = getHeight();
final int available = height - mPaddingTop - mPaddingBottom
- drawableHeight;
int x = (int) event.getY();
mPosition = x - mPaddingTop - drawableHeight / 2;
if (mPosition < 0) mPosition = 0;
if (mPosition > available) mPosition = available;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
int drawableHeight = drawable.getIntrinsicHeight();
int drawableWidth = drawable.getIntrinsicWidth();
if (drawableWidth == 0 || drawableHeight == 0) {
return; // nothing to draw (empty bounds)
}
if (mAnimationStartTime != NO_ANIMATION) {
final int available = getHeight() - mPaddingTop - mPaddingBottom
- drawableHeight;
long time = AnimationUtils.currentAnimationTimeMillis();
int deltaTime = (int)(time - mAnimationStartTime);
mPosition = mAnimationStartPosition +
ANIMATION_SPEED * (mSwitch ? deltaTime : -deltaTime) / 1000;
if (mPosition < 0) mPosition = 0;
if (mPosition > available) mPosition = available;
boolean done = (mPosition == (mSwitch ? available : 0));
if (!done) {
invalidate();
} else {
mAnimationStartTime = NO_ANIMATION;
}
}
int offsetTop = mPaddingTop + mPosition;
int offsetLeft = (getWidth()
- drawableWidth - mPaddingLeft - mPaddingRight) / 2;
int saveCount = canvas.getSaveCount();
canvas.save();
canvas.translate(offsetLeft, offsetTop);
drawable.draw(canvas);
canvas.restoreToCount(saveCount);
}
// Consume the touch events for the specified view.
public void addTouchView(View v) {
v.setOnTouchListener(this);
}
// This implements View.OnTouchListener so we intercept the touch events
// and pass them to ourselves.
public boolean onTouch(View v, MotionEvent event) {
onTouchEvent(event);
return true;
}
}
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