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/*
* Copyright (C) 2016 Cyanogen, Inc.
* Copyright (C) 2016 The CyanogenMod 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 org.cyanogenmod.theme.chooser2;
import android.content.Context;
import android.graphics.Point;
import android.support.v4.view.ThemeViewPager;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
/**
* PagerContainer: A layout that displays a ViewPager with its children that are outside
* the typical pager bounds.
*/
public class PagerContainer extends FrameLayout implements ViewPager.OnPageChangeListener {
private static final int ANIMATE_OUT_DURATION = 300;
private static final int ANIMATE_OUT_INTERPOLATE_FACTOR = 1;
private static final int ANIMATE_IN_DURATION = 300;
private static final int ANIMATE_IN_INTERPOLATE_FACTOR = 2;
private ThemeViewPager mPager;
private Point mCenter = new Point();
private Point mInitialTouch = new Point();
private int mCollapsedHeight;
private boolean mIsAnimating = false;
boolean mNeedsRedraw = false;
public PagerContainer(Context context) {
this(context, null, 0);
}
public PagerContainer(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public PagerContainer(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mCollapsedHeight = generateLayoutParams(attrs).height;
//Disable clipping of children so non-selected pages are visible
setClipChildren(false);
}
@Override
protected void onFinishInflate() {
try {
mPager = (ThemeViewPager) getChildAt(0);
mPager.setOnPageChangeListener(this);
} catch (Exception e) {
throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
}
}
public ThemeViewPager getViewPager() {
return mPager;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mCenter.x = w / 2;
mCenter.y = h / 2;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mIsAnimating) return true;
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// Do not allow touch events to propagate if we are animating
if (mIsAnimating) return true;
//We capture any touches not already handled by the ViewPager
// to implement scrolling from a touch outside the pager bounds.
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mInitialTouch.x = (int)ev.getX();
mInitialTouch.y = (int)ev.getY();
default:
ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
break;
}
return mPager.dispatchTouchEvent(ev);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//Force the container to redraw on scrolling.
//Without this the outer pages render initially and then stay static
if (mNeedsRedraw) invalidate();
}
@Override
public void onPageSelected(int position) { }
@Override
public void onPageScrollStateChanged(int state) {
mNeedsRedraw = (state != ThemeViewPager.SCROLL_STATE_IDLE);
}
public void setIsAnimating(boolean isAnimating) {
mIsAnimating = isAnimating;
}
public void expand() {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(getLayoutParams());
params.height = LinearLayout.LayoutParams.MATCH_PARENT;
setLayoutParams(params);
mPager.setExpanded(true);
final int current = mPager.getCurrentItem();
final int prevY = (int) getY();
//Since our viewpager's width is changing to fill the screen
//we must start the left/right children of the current page inwards on first draw
final int lChildPrevXf;
final int rChildPrevXf;
if (current != 0) {
final View lchild = mPager.getViewForPosition(current - 1);
lChildPrevXf = (int) lchild.getX();
} else {
lChildPrevXf = 0;
}
if (current < mPager.getAdapter().getCount() - 1) {
View rchild = mPager.getViewForPosition(current + 1);
rChildPrevXf = (int) rchild.getX();
} else {
rChildPrevXf = 0;
}
final ViewTreeObserver observer = mPager.getViewTreeObserver();
observer.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
observer.removeOnPreDrawListener(this);
if (current != 0) {
View lchild = mPager.getViewForPosition(current - 1);
lchild.setTranslationY(prevY - getY());
lchild.setX(lChildPrevXf);
animateChildOut(lchild, -getWidth());
}
if (current < mPager.getAdapter().getCount() - 1) {
View rchild = mPager.getViewForPosition(current + 1);
rchild.setX(rChildPrevXf);
rchild.setTranslationY(prevY - getY());
animateChildOut(rchild, getWidth());
}
return false;
}
});
}
public void collapse() {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(getLayoutParams());
params.height = mCollapsedHeight;
setLayoutParams(params);
mPager.setExpanded(false);
int current = mPager.getCurrentItem();
final int prevY = (int) getY();
if (current != 0) {
View lchild = mPager.getViewForPosition(current - 1);
lchild.setTranslationY(0);
animateChildIn(lchild);
}
if (current < mPager.getAdapter().getCount() - 1) {
View rchild = mPager.getViewForPosition(current + 1);
rchild.setTranslationY(0);
animateChildIn(rchild);
}
}
private void animateChildOut(final View v, float endX) {
v.animate()
.translationX(endX)
.setDuration(ANIMATE_OUT_DURATION)
.setInterpolator(new AccelerateInterpolator(ANIMATE_OUT_INTERPOLATE_FACTOR));
}
private void animateChildIn(final View v) {
v.animate()
.translationX(0)
.setDuration(ANIMATE_IN_DURATION)
.setInterpolator(new DecelerateInterpolator(ANIMATE_IN_INTERPOLATE_FACTOR));
}
}
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