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/*
* Copyright (C) 2017 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.incallui.incall.impl;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.VisibleForTesting;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.View;
import com.android.dialer.common.Assert;
/**
* This is the view class for incall paginator visible when a user has EC data attached to their
* call. It contains animation methods when the swipe gesture is performed.
*/
public class InCallPaginator extends View implements OnPageChangeListener {
private int dotRadius;
private int dotsSeparation;
private Paint activeDotPaintPortrait;
private Paint inactiveDotPaintPortrait;
private Path inactiveDotPath;
private ValueAnimator transitionAnimator;
private boolean useModeSwitchTransition;
private float progress;
private boolean toFirstPage;
private boolean pageChanged;
public InCallPaginator(Context context) {
super(context);
init(context);
}
public InCallPaginator(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context) {
dotRadius = getResources().getDimensionPixelSize(R.dimen.paginator_dot_radius);
dotsSeparation = getResources().getDimensionPixelSize(R.dimen.paginator_dots_separation);
int activeDotColor = context.getColor(R.color.paginator_dot);
int inactiveDotColor = context.getColor(R.color.paginator_path);
activeDotPaintPortrait = new Paint(Paint.ANTI_ALIAS_FLAG);
activeDotPaintPortrait.setColor(activeDotColor);
inactiveDotPaintPortrait = new Paint(Paint.ANTI_ALIAS_FLAG);
inactiveDotPaintPortrait.setColor(inactiveDotColor);
inactiveDotPath = new Path();
transitionAnimator = ValueAnimator.ofFloat(0f, 1f);
transitionAnimator.setInterpolator(null);
transitionAnimator.setCurrentFraction(0f);
transitionAnimator.addUpdateListener(animation -> invalidate());
}
@VisibleForTesting
public void setProgress(float progress, boolean toFirstPage) {
this.progress = progress;
this.toFirstPage = toFirstPage;
// Ensure the dot transition keeps up with the swipe progress.
if (transitionAnimator.isStarted() && progress > transitionAnimator.getAnimatedFraction()) {
transitionAnimator.setCurrentFraction(progress);
}
invalidate();
}
private void startTransition() {
if (transitionAnimator.getAnimatedFraction() < 1f) {
transitionAnimator.setCurrentFraction(progress);
useModeSwitchTransition = false;
transitionAnimator.cancel();
transitionAnimator.start();
}
}
private void endTransition(boolean snapBack) {
if (transitionAnimator.getAnimatedFraction() > 0f) {
useModeSwitchTransition = !snapBack;
transitionAnimator.cancel();
transitionAnimator.reverse();
}
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
float transitionFraction = (float) transitionAnimator.getAnimatedValue();
// Draw the inactive "dots".
inactiveDotPath.reset();
if (useModeSwitchTransition) {
float trackWidth = 2 * dotRadius + transitionFraction * (2 * dotRadius + dotsSeparation);
float indicatorRadius = dotRadius * (1f - 2f * Math.min(transitionFraction, 0.5f));
float indicatorOffset = dotRadius + dotsSeparation / 2;
if (toFirstPage) {
float trackLeft = centerX - indicatorOffset - dotRadius;
inactiveDotPath.addRoundRect(
trackLeft,
centerY - dotRadius,
trackLeft + trackWidth,
centerY + dotRadius,
dotRadius,
dotRadius,
Path.Direction.CW);
inactiveDotPath.addCircle(
centerX + indicatorOffset, centerY, indicatorRadius, Path.Direction.CW);
} else {
float trackRight = centerX + indicatorOffset + dotRadius;
inactiveDotPath.addRoundRect(
trackRight - trackWidth,
centerY - dotRadius,
trackRight,
centerY + dotRadius,
dotRadius,
dotRadius,
Path.Direction.CW);
inactiveDotPath.addCircle(
centerX - indicatorOffset, centerY, indicatorRadius, Path.Direction.CW);
}
} else {
float centerOffset = dotsSeparation / 2f;
float innerOffset = centerOffset - transitionFraction * (dotRadius + centerOffset);
float outerOffset = 2f * dotRadius + centerOffset;
inactiveDotPath.addRoundRect(
centerX - outerOffset,
centerY - dotRadius,
centerX - innerOffset,
centerY + dotRadius,
dotRadius,
dotRadius,
Path.Direction.CW);
inactiveDotPath.addRoundRect(
centerX + innerOffset,
centerY - dotRadius,
centerX + outerOffset,
centerY + dotRadius,
dotRadius,
dotRadius,
Path.Direction.CW);
}
Paint inactivePaint = inactiveDotPaintPortrait;
canvas.drawPath(inactiveDotPath, inactivePaint);
// Draw the white active dot.
float activeDotOffset =
(toFirstPage ? 1f - 2f * progress : 2f * progress - 1f) * (dotRadius + dotsSeparation / 2);
Paint activePaint = activeDotPaintPortrait;
canvas.drawCircle(centerX + activeDotOffset, centerY, dotRadius, activePaint);
}
public void setupWithViewPager(ViewPager pager) {
Assert.checkArgument(pager.getAdapter().getCount() == 2, "Invalid page count.");
pager.addOnPageChangeListener(this);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
setProgress(positionOffset, position != 0);
}
@Override
public void onPageSelected(int position) {
pageChanged = true;
}
@Override
public void onPageScrollStateChanged(int state) {
switch (state) {
case ViewPager.SCROLL_STATE_IDLE:
endTransition(!pageChanged);
pageChanged = false;
break;
case ViewPager.SCROLL_STATE_DRAGGING:
startTransition();
break;
case ViewPager.SCROLL_STATE_SETTLING:
default:
break;
}
}
}
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