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/*
* 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;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.ImageView;
class PanoProgressBar extends ImageView {
@SuppressWarnings("unused")
private static final String TAG = "PanoProgressBar";
public static final int DIRECTION_NONE = 0;
public static final int DIRECTION_LEFT = 1;
public static final int DIRECTION_RIGHT = 2;
private float mProgress = 0;
private float mMaxProgress = 0;
private float mLeftMostProgress = 0;
private float mRightMostProgress = 0;
private float mProgressOffset = 0;
private float mIndicatorWidth = 0;
private int mDirection = 0;
private final Paint mBackgroundPaint = new Paint();
private final Paint mDoneAreaPaint = new Paint();
private final Paint mIndicatorPaint = new Paint();
private float mWidth;
private float mHeight;
private RectF mDrawBounds;
private OnDirectionChangeListener mListener = null;
private int mOldProgress = 0;
public interface OnDirectionChangeListener {
public void onDirectionChange(int direction);
}
public PanoProgressBar(Context context, AttributeSet attrs) {
super(context, attrs);
mDoneAreaPaint.setStyle(Paint.Style.FILL);
mDoneAreaPaint.setAlpha(0xff);
mBackgroundPaint.setStyle(Paint.Style.FILL);
mBackgroundPaint.setAlpha(0xff);
mIndicatorPaint.setStyle(Paint.Style.FILL);
mIndicatorPaint.setAlpha(0xff);
mDrawBounds = new RectF();
}
public void setOnDirectionChangeListener(OnDirectionChangeListener l) {
mListener = l;
}
private void setDirection(int direction) {
if (mDirection != direction) {
mDirection = direction;
if (mListener != null) {
mListener.onDirectionChange(mDirection);
}
invalidate();
}
}
public int getDirection() {
return mDirection;
}
@Override
public void setBackgroundColor(int color) {
mBackgroundPaint.setColor(color);
invalidate();
}
public void setDoneColor(int color) {
mDoneAreaPaint.setColor(color);
invalidate();
}
public void setIndicatorColor(int color) {
mIndicatorPaint.setColor(color);
invalidate();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mWidth = w;
mHeight = h;
mDrawBounds.set(0, 0, mWidth, mHeight);
}
public void setMaxProgress(int progress) {
mMaxProgress = progress;
}
public void setIndicatorWidth(float w) {
mIndicatorWidth = w;
invalidate();
}
public void setRightIncreasing(boolean rightIncreasing) {
if (rightIncreasing) {
mLeftMostProgress = 0;
mRightMostProgress = 0;
mProgressOffset = 0;
setDirection(DIRECTION_RIGHT);
} else {
mLeftMostProgress = mWidth;
mRightMostProgress = mWidth;
mProgressOffset = mWidth;
setDirection(DIRECTION_LEFT);
}
invalidate();
}
public void setProgress(int progress) {
// The panning direction will be decided after user pan more than 10 degrees in one
// direction.
if (mDirection == DIRECTION_NONE) {
if (progress > 10) {
setRightIncreasing(true);
} else if (progress < -10) {
setRightIncreasing(false);
}
}
// When user move to the opposite direction more than 10 degrees,
// change the direction and stop the capture progress in PanoramaModule.
if (Math.abs(mOldProgress) - Math.abs(progress) > 10) {
if (mListener != null) {
mListener.onDirectionChange(mDirection / 2 + 1);
}
return;
}
// mDirection might be modified by setRightIncreasing() above. Need to check again.
if (mDirection != DIRECTION_NONE) {
mProgress = progress * mWidth / mMaxProgress + mProgressOffset;
// value bounds.
mProgress = Math.min(mWidth, Math.max(0, mProgress));
if (mDirection == DIRECTION_RIGHT) {
// The right most progress is adjusted.
mRightMostProgress = Math.max(mRightMostProgress, mProgress);
}
if (mDirection == DIRECTION_LEFT) {
// The left most progress is adjusted.
mLeftMostProgress = Math.min(mLeftMostProgress, mProgress);
}
invalidate();
}
if (Math.abs(mOldProgress) < Math.abs(progress)) {
mOldProgress = progress;
}
}
public void reset() {
mProgress = 0;
mProgressOffset = 0;
mOldProgress = 0;
setDirection(DIRECTION_NONE);
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
// the background
canvas.drawRect(mDrawBounds, mBackgroundPaint);
if (mDirection != DIRECTION_NONE) {
// the progress area
canvas.drawRect(mLeftMostProgress, mDrawBounds.top, mRightMostProgress,
mDrawBounds.bottom, mDoneAreaPaint);
// the indication bar
float l;
float r;
if (mDirection == DIRECTION_RIGHT) {
l = Math.max(mProgress - mIndicatorWidth, 0f);
r = mProgress;
} else {
l = mProgress;
r = Math.min(mProgress + mIndicatorWidth, mWidth);
}
canvas.drawRect(l, mDrawBounds.top, r, mDrawBounds.bottom, mIndicatorPaint);
}
}
}
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