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/*
* Copyright (C) 2012 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 android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.RectF;
import android.os.Handler;
import android.os.Message;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.LinearInterpolator;
import android.view.animation.Transformation;
import com.android.camera.R;
import com.android.gallery3d.common.ApiHelper;
import java.util.ArrayList;
import java.util.List;
public class PieRenderer extends OverlayRenderer
implements FocusIndicator {
private static final String TAG = "CAM Pie";
// Sometimes continuous autofocus starts and stops several times quickly.
// These states are used to make sure the animation is run for at least some
// time.
private volatile int mState;
private ScaleAnimation mAnimation = new ScaleAnimation();
private static final int STATE_IDLE = 0;
private static final int STATE_FOCUSING = 1;
private static final int STATE_FINISHING = 2;
private static final int STATE_PIE = 8;
private Runnable mDisappear = new Disappear();
private Animation.AnimationListener mEndAction = new EndAction();
private static final int SCALING_UP_TIME = 600;
private static final int SCALING_DOWN_TIME = 100;
private static final int DISAPPEAR_TIMEOUT = 200;
private static final int DIAL_HORIZONTAL = 157;
private static final long PIE_FADE_IN_DURATION = 200;
private static final long PIE_XFADE_DURATION = 200;
private static final long PIE_SELECT_FADE_DURATION = 300;
private static final int MSG_OPEN = 0;
private static final int MSG_CLOSE = 1;
private static final float PIE_SWEEP = (float)(Math.PI * 2 / 3);
// geometry
private Point mCenter;
private int mRadius;
private int mRadiusInc;
// the detection if touch is inside a slice is offset
// inbounds by this amount to allow the selection to show before the
// finger covers it
private int mTouchOffset;
private List<PieItem> mItems;
private PieItem mOpenItem;
private Paint mSelectedPaint;
private Paint mSubPaint;
// touch handling
private PieItem mCurrentItem;
private Paint mFocusPaint;
private int mSuccessColor;
private int mFailColor;
private int mCircleSize;
private int mFocusX;
private int mFocusY;
private int mCenterX;
private int mCenterY;
private int mDialAngle;
private RectF mCircle;
private RectF mDial;
private Point mPoint1;
private Point mPoint2;
private int mStartAnimationAngle;
private boolean mFocused;
private int mInnerOffset;
private int mOuterStroke;
private int mInnerStroke;
private boolean mTapMode;
private boolean mBlockFocus;
private int mTouchSlopSquared;
private Point mDown;
private boolean mOpening;
private LinearAnimation mXFade;
private LinearAnimation mFadeIn;
private volatile boolean mFocusCancelled;
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch(msg.what) {
case MSG_OPEN:
if (mListener != null) {
mListener.onPieOpened(mCenter.x, mCenter.y);
}
break;
case MSG_CLOSE:
if (mListener != null) {
mListener.onPieClosed();
}
break;
}
}
};
private PieListener mListener;
static public interface PieListener {
public void onPieOpened(int centerX, int centerY);
public void onPieClosed();
}
public void setPieListener(PieListener pl) {
mListener = pl;
}
public PieRenderer(Context context) {
init(context);
}
private void init(Context ctx) {
setVisible(false);
mItems = new ArrayList<PieItem>();
Resources res = ctx.getResources();
mRadius = (int) res.getDimensionPixelSize(R.dimen.pie_radius_start);
mCircleSize = mRadius - res.getDimensionPixelSize(R.dimen.focus_radius_offset);
mRadiusInc = (int) res.getDimensionPixelSize(R.dimen.pie_radius_increment);
mTouchOffset = (int) res.getDimensionPixelSize(R.dimen.pie_touch_offset);
mCenter = new Point(0,0);
mSelectedPaint = new Paint();
mSelectedPaint.setColor(Color.argb(255, 51, 181, 229));
mSelectedPaint.setAntiAlias(true);
mSubPaint = new Paint();
mSubPaint.setAntiAlias(true);
mSubPaint.setColor(Color.argb(200, 250, 230, 128));
mFocusPaint = new Paint();
mFocusPaint.setAntiAlias(true);
mFocusPaint.setColor(Color.WHITE);
mFocusPaint.setStyle(Paint.Style.STROKE);
mSuccessColor = Color.GREEN;
mFailColor = Color.RED;
mCircle = new RectF();
mDial = new RectF();
mPoint1 = new Point();
mPoint2 = new Point();
mInnerOffset = res.getDimensionPixelSize(R.dimen.focus_inner_offset);
mOuterStroke = res.getDimensionPixelSize(R.dimen.focus_outer_stroke);
mInnerStroke = res.getDimensionPixelSize(R.dimen.focus_inner_stroke);
mState = STATE_IDLE;
mBlockFocus = false;
mTouchSlopSquared = ViewConfiguration.get(ctx).getScaledTouchSlop();
mTouchSlopSquared = mTouchSlopSquared * mTouchSlopSquared;
mDown = new Point();
}
public boolean showsItems() {
return mTapMode;
}
public void addItem(PieItem item) {
// add the item to the pie itself
mItems.add(item);
}
public void removeItem(PieItem item) {
mItems.remove(item);
}
public void clearItems() {
mItems.clear();
}
public void showInCenter() {
if ((mState == STATE_PIE) && isVisible()) {
mTapMode = false;
show(false);
} else {
if (mState != STATE_IDLE) {
cancelFocus();
}
mState = STATE_PIE;
setCenter(mCenterX, mCenterY);
mTapMode = true;
show(true);
}
}
public void hide() {
show(false);
}
/**
* guaranteed has center set
* @param show
*/
private void show(boolean show) {
if (show) {
mState = STATE_PIE;
// ensure clean state
mCurrentItem = null;
mOpenItem = null;
for (PieItem item : mItems) {
item.setSelected(false);
}
layoutPie();
fadeIn();
} else {
mState = STATE_IDLE;
mTapMode = false;
if (mXFade != null) {
mXFade.cancel();
}
}
setVisible(show);
mHandler.sendEmptyMessage(show ? MSG_OPEN : MSG_CLOSE);
}
private void fadeIn() {
mFadeIn = new LinearAnimation(0, 1);
mFadeIn.setDuration(PIE_FADE_IN_DURATION);
mFadeIn.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mFadeIn = null;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
mFadeIn.startNow();
mOverlay.startAnimation(mFadeIn);
}
public void setCenter(int x, int y) {
mCenter.x = x;
mCenter.y = y;
// when using the pie menu, align the focus ring
alignFocus(x, y);
}
private void layoutPie() {
int rgap = 2;
int inner = mRadius + rgap;
int outer = mRadius + mRadiusInc - rgap;
int gap = 1;
layoutItems(mItems, (float) (Math.PI / 2), inner, outer, gap);
}
private void layoutItems(List<PieItem> items, float centerAngle, int inner,
int outer, int gap) {
float emptyangle = PIE_SWEEP / 16;
float sweep = (float) (PIE_SWEEP - 2 * emptyangle) / items.size();
float angle = centerAngle - PIE_SWEEP / 2 + emptyangle + sweep / 2;
// check if we have custom geometry
// first item we find triggers custom sweep for all
// this allows us to re-use the path
for (PieItem item : items) {
if (item.getCenter() >= 0) {
sweep = item.getSweep();
break;
}
}
Path path = makeSlice(getDegrees(0) - gap, getDegrees(sweep) + gap,
outer, inner, mCenter);
for (PieItem item : items) {
// shared between items
item.setPath(path);
if (item.getCenter() >= 0) {
angle = item.getCenter();
}
int w = item.getIntrinsicWidth();
int h = item.getIntrinsicHeight();
// move views to outer border
int r = inner + (outer - inner) * 2 / 3;
int x = (int) (r * Math.cos(angle));
int y = mCenter.y - (int) (r * Math.sin(angle)) - h / 2;
x = mCenter.x + x - w / 2;
item.setBounds(x, y, x + w, y + h);
float itemstart = angle - sweep / 2;
item.setGeometry(itemstart, sweep, inner, outer);
if (item.hasItems()) {
layoutItems(item.getItems(), angle, inner,
outer + mRadiusInc / 2, gap);
}
angle += sweep;
}
}
private Path makeSlice(float start, float end, int outer, int inner, Point center) {
RectF bb =
new RectF(center.x - outer, center.y - outer, center.x + outer,
center.y + outer);
RectF bbi =
new RectF(center.x - inner, center.y - inner, center.x + inner,
center.y + inner);
Path path = new Path();
path.arcTo(bb, start, end - start, true);
path.arcTo(bbi, end, start - end);
path.close();
return path;
}
/**
* converts a
* @param angle from 0..PI to Android degrees (clockwise starting at 3 o'clock)
* @return skia angle
*/
private float getDegrees(double angle) {
return (float) (360 - 180 * angle / Math.PI);
}
private void startFadeOut() {
if (ApiHelper.HAS_VIEW_PROPERTY_ANIMATOR) {
mOverlay.animate().alpha(0).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
deselect();
show(false);
mOverlay.setAlpha(1);
super.onAnimationEnd(animation);
}
}).setDuration(PIE_SELECT_FADE_DURATION);
} else {
deselect();
show(false);
}
}
@Override
public void onDraw(Canvas canvas) {
float alpha = 1;
if (mXFade != null) {
alpha = mXFade.getValue();
} else if (mFadeIn != null) {
alpha = mFadeIn.getValue();
}
int state = canvas.save();
if (mFadeIn != null) {
float sf = 0.9f + alpha * 0.1f;
canvas.scale(sf, sf, mCenter.x, mCenter.y);
}
drawFocus(canvas);
if (mState == STATE_FINISHING) {
canvas.restoreToCount(state);
return;
}
if ((mOpenItem == null) || (mXFade != null)) {
// draw base menu
for (PieItem item : mItems) {
drawItem(canvas, item, alpha);
}
}
if (mOpenItem != null) {
for (PieItem inner : mOpenItem.getItems()) {
drawItem(canvas, inner, (mXFade != null) ? (1 - 0.5f * alpha) : 1);
}
}
canvas.restoreToCount(state);
}
private void drawItem(Canvas canvas, PieItem item, float alpha) {
if (mState == STATE_PIE) {
if (item.getPath() != null) {
if (item.isSelected()) {
Paint p = mSelectedPaint;
int state = canvas.save();
float r = getDegrees(item.getStartAngle());
canvas.rotate(r, mCenter.x, mCenter.y);
canvas.drawPath(item.getPath(), p);
canvas.restoreToCount(state);
}
alpha = alpha * (item.isEnabled() ? 1 : 0.3f);
// draw the item view
item.setAlpha(alpha);
item.draw(canvas);
}
}
}
@Override
public boolean onTouchEvent(MotionEvent evt) {
float x = evt.getX();
float y = evt.getY();
int action = evt.getActionMasked();
PointF polar = getPolar(x, y, !(mTapMode));
if (MotionEvent.ACTION_DOWN == action) {
mDown.x = (int) evt.getX();
mDown.y = (int) evt.getY();
mOpening = false;
if (mTapMode) {
PieItem item = findItem(polar);
if ((item != null) && (mCurrentItem != item)) {
mState = STATE_PIE;
onEnter(item);
}
} else {
setCenter((int) x, (int) y);
show(true);
}
return true;
} else if (MotionEvent.ACTION_UP == action) {
if (isVisible()) {
PieItem item = mCurrentItem;
if (mTapMode) {
item = findItem(polar);
if (item != null && mOpening) {
mOpening = false;
return true;
}
}
if (item == null) {
mTapMode = false;
show(false);
} else if (!mOpening
&& !item.hasItems()) {
item.performClick();
startFadeOut();
mTapMode = false;
}
return true;
}
} else if (MotionEvent.ACTION_CANCEL == action) {
if (isVisible() || mTapMode) {
show(false);
}
deselect();
return false;
} else if (MotionEvent.ACTION_MOVE == action) {
if (polar.y < mRadius) {
if (mOpenItem != null) {
mOpenItem = null;
} else {
deselect();
}
return false;
}
PieItem item = findItem(polar);
boolean moved = hasMoved(evt);
if ((item != null) && (mCurrentItem != item) && (!mOpening || moved)) {
// only select if we didn't just open or have moved past slop
mOpening = false;
if (moved) {
// switch back to swipe mode
mTapMode = false;
}
onEnter(item);
}
}
return false;
}
private boolean hasMoved(MotionEvent e) {
return mTouchSlopSquared < (e.getX() - mDown.x) * (e.getX() - mDown.x)
+ (e.getY() - mDown.y) * (e.getY() - mDown.y);
}
/**
* enter a slice for a view
* updates model only
* @param item
*/
private void onEnter(PieItem item) {
if (mCurrentItem != null) {
mCurrentItem.setSelected(false);
}
if (item != null && item.isEnabled()) {
item.setSelected(true);
mCurrentItem = item;
if ((mCurrentItem != mOpenItem) && mCurrentItem.hasItems()) {
openCurrentItem();
}
} else {
mCurrentItem = null;
}
}
private void deselect() {
if (mCurrentItem != null) {
mCurrentItem.setSelected(false);
}
if (mOpenItem != null) {
mOpenItem = null;
}
mCurrentItem = null;
}
private void openCurrentItem() {
if ((mCurrentItem != null) && mCurrentItem.hasItems()) {
mCurrentItem.setSelected(false);
mOpenItem = mCurrentItem;
mOpening = true;
mXFade = new LinearAnimation(1, 0);
mXFade.setDuration(PIE_XFADE_DURATION);
mXFade.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mXFade = null;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
mXFade.startNow();
mOverlay.startAnimation(mXFade);
}
}
private PointF getPolar(float x, float y, boolean useOffset) {
PointF res = new PointF();
// get angle and radius from x/y
res.x = (float) Math.PI / 2;
x = x - mCenter.x;
y = mCenter.y - y;
res.y = (float) Math.sqrt(x * x + y * y);
if (x != 0) {
res.x = (float) Math.atan2(y, x);
if (res.x < 0) {
res.x = (float) (2 * Math.PI + res.x);
}
}
res.y = res.y + (useOffset ? mTouchOffset : 0);
return res;
}
/**
* @param polar x: angle, y: dist
* @return the item at angle/dist or null
*/
private PieItem findItem(PointF polar) {
// find the matching item:
List<PieItem> items = (mOpenItem != null) ? mOpenItem.getItems() : mItems;
for (PieItem item : items) {
if (inside(polar, item)) {
return item;
}
}
return null;
}
private boolean inside(PointF polar, PieItem item) {
return (item.getInnerRadius() < polar.y)
&& (item.getStartAngle() < polar.x)
&& (item.getStartAngle() + item.getSweep() > polar.x)
&& (!mTapMode || (item.getOuterRadius() > polar.y));
}
@Override
public boolean handlesTouch() {
return true;
}
// focus specific code
public void setBlockFocus(boolean blocked) {
mBlockFocus = blocked;
if (blocked) {
clear();
}
}
public void setFocus(int x, int y) {
mFocusX = x;
mFocusY = y;
setCircle(mFocusX, mFocusY);
}
public void alignFocus(int x, int y) {
mOverlay.removeCallbacks(mDisappear);
mAnimation.cancel();
mAnimation.reset();
mFocusX = x;
mFocusY = y;
mDialAngle = DIAL_HORIZONTAL;
setCircle(x, y);
mFocused = false;
}
public int getSize() {
return 2 * mCircleSize;
}
private int getRandomRange() {
return (int)(-60 + 120 * Math.random());
}
@Override
public void layout(int l, int t, int r, int b) {
super.layout(l, t, r, b);
mCenterX = (r - l) / 2;
mCenterY = (b - t) / 2;
mFocusX = mCenterX;
mFocusY = mCenterY;
setCircle(mFocusX, mFocusY);
if (isVisible() && mState == STATE_PIE) {
setCenter(mCenterX, mCenterY);
layoutPie();
}
}
private void setCircle(int cx, int cy) {
mCircle.set(cx - mCircleSize, cy - mCircleSize,
cx + mCircleSize, cy + mCircleSize);
mDial.set(cx - mCircleSize + mInnerOffset, cy - mCircleSize + mInnerOffset,
cx + mCircleSize - mInnerOffset, cy + mCircleSize - mInnerOffset);
}
public void drawFocus(Canvas canvas) {
if (mBlockFocus) return;
mFocusPaint.setStrokeWidth(mOuterStroke);
canvas.drawCircle((float) mFocusX, (float) mFocusY, (float) mCircleSize, mFocusPaint);
if (mState == STATE_PIE) return;
int color = mFocusPaint.getColor();
if (mState == STATE_FINISHING) {
mFocusPaint.setColor(mFocused ? mSuccessColor : mFailColor);
}
mFocusPaint.setStrokeWidth(mInnerStroke);
drawLine(canvas, mDialAngle, mFocusPaint);
drawLine(canvas, mDialAngle + 45, mFocusPaint);
drawLine(canvas, mDialAngle + 180, mFocusPaint);
drawLine(canvas, mDialAngle + 225, mFocusPaint);
canvas.save();
// rotate the arc instead of its offset to better use framework's shape caching
canvas.rotate(mDialAngle, mFocusX, mFocusY);
canvas.drawArc(mDial, 0, 45, false, mFocusPaint);
canvas.drawArc(mDial, 180, 45, false, mFocusPaint);
canvas.restore();
mFocusPaint.setColor(color);
}
private void drawLine(Canvas canvas, int angle, Paint p) {
convertCart(angle, mCircleSize - mInnerOffset, mPoint1);
convertCart(angle, mCircleSize - mInnerOffset + mInnerOffset / 3, mPoint2);
canvas.drawLine(mPoint1.x + mFocusX, mPoint1.y + mFocusY,
mPoint2.x + mFocusX, mPoint2.y + mFocusY, p);
}
private static void convertCart(int angle, int radius, Point out) {
double a = 2 * Math.PI * (angle % 360) / 360;
out.x = (int) (radius * Math.cos(a) + 0.5);
out.y = (int) (radius * Math.sin(a) + 0.5);
}
@Override
public void showStart() {
if (mState == STATE_PIE) return;
cancelFocus();
mStartAnimationAngle = 67;
int range = getRandomRange();
startAnimation(SCALING_UP_TIME,
false, mStartAnimationAngle, mStartAnimationAngle + range);
mState = STATE_FOCUSING;
}
@Override
public void showSuccess(boolean timeout) {
if (mState == STATE_FOCUSING) {
startAnimation(SCALING_DOWN_TIME,
timeout, mStartAnimationAngle);
mState = STATE_FINISHING;
mFocused = true;
}
}
@Override
public void showFail(boolean timeout) {
if (mState == STATE_FOCUSING) {
startAnimation(SCALING_DOWN_TIME,
timeout, mStartAnimationAngle);
mState = STATE_FINISHING;
mFocused = false;
}
}
private void cancelFocus() {
mFocusCancelled = true;
mOverlay.removeCallbacks(mDisappear);
if (mAnimation != null) {
mAnimation.cancel();
}
mFocusCancelled = false;
mFocused = false;
mState = STATE_IDLE;
}
@Override
public void clear() {
if (mState == STATE_PIE) return;
cancelFocus();
mOverlay.post(mDisappear);
}
private void startAnimation(long duration, boolean timeout,
float toScale) {
startAnimation(duration, timeout, mDialAngle,
toScale);
}
private void startAnimation(long duration, boolean timeout,
float fromScale, float toScale) {
setVisible(true);
mAnimation.reset();
mAnimation.setDuration(duration);
mAnimation.setScale(fromScale, toScale);
mAnimation.setAnimationListener(timeout ? mEndAction : null);
mOverlay.startAnimation(mAnimation);
update();
}
private class EndAction implements Animation.AnimationListener {
@Override
public void onAnimationEnd(Animation animation) {
// Keep the focus indicator for some time.
if (!mFocusCancelled) {
mOverlay.postDelayed(mDisappear, DISAPPEAR_TIMEOUT);
}
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationStart(Animation animation) {
}
}
private class Disappear implements Runnable {
@Override
public void run() {
if (mState == STATE_PIE) return;
setVisible(false);
mFocusX = mCenterX;
mFocusY = mCenterY;
mState = STATE_IDLE;
setCircle(mFocusX, mFocusY);
mFocused = false;
}
}
private class ScaleAnimation extends Animation {
private float mFrom = 1f;
private float mTo = 1f;
public ScaleAnimation() {
setFillAfter(true);
}
public void setScale(float from, float to) {
mFrom = from;
mTo = to;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
mDialAngle = (int)(mFrom + (mTo - mFrom) * interpolatedTime);
}
}
private class LinearAnimation extends Animation {
private float mFrom;
private float mTo;
private float mValue;
public LinearAnimation(float from, float to) {
setFillAfter(true);
setInterpolator(new LinearInterpolator());
mFrom = from;
mTo = to;
}
public float getValue() {
return mValue;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
mValue = (mFrom + (mTo - mFrom) * interpolatedTime);
}
}
}