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package com.android.systemui.qs;
import android.animation.Animator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
public class QSViewPager extends ViewPager {
private static final String TAG = "QSViewPager";
protected static final float SCROLL_PERCENT = .10f;
private boolean mPagingEnabled;
QSDragPanel mDragPanel;
public QSViewPager(Context context) {
super(context);
}
public void setDragPanel(QSDragPanel p) {
mDragPanel = p;
}
@Override
public boolean hasOverlappingRendering() {
return mDragPanel.isEditing();
}
@Override
public boolean canScrollHorizontally(int direction) {
if (direction < 0
&& mDragPanel.isDragging()
&& mPagingEnabled
&& getCurrentItem() == 1) {
// can't scroll left while not editing, OR dragging on the first page
return false;
}
return super.canScrollHorizontally(direction);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
int h = child.getMeasuredHeight();
if (h > height) height = h;
}
heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
public void animatePagerTransition(final boolean forward) {
ValueAnimator animator = ValueAnimator.ofInt(0, getWidth());
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
if (isFakeDragging()) {
endFakeDrag();
}
}
@Override
public void onAnimationCancel(Animator animation) {
if (isFakeDragging()) {
endFakeDrag();
}
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
animator.setInterpolator(new AccelerateInterpolator());
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
private int oldDragPosition = 0;
@Override
public void onAnimationUpdate(ValueAnimator animation) {
if (isFakeDragging()) {
int dragPosition = (Integer) animation.getAnimatedValue();
int dragOffset = dragPosition - oldDragPosition;
oldDragPosition = dragPosition;
fakeDragBy(dragOffset * (forward ? -1 : 1));
}
}
});
if (beginFakeDrag()) {
animator.setDuration(500);
animator.start();
} else {
Log.e(TAG, "can't start fake drag?");
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
if (mPagingEnabled) {
return super.onInterceptTouchEvent(event);
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mPagingEnabled) {
return super.onTouchEvent(event);
}
return false;
}
public void setPagingEnabled(boolean enabled) {
if (mPagingEnabled == enabled) return;
mPagingEnabled = enabled;
//Log.i(TAG, "setPagingEnabled() called with " + "enabled = [" + enabled + "]");
if (getCurrentItem() > 0 && !mPagingEnabled) {
//Log.w(TAG, "resetting to item 0 because paging is disabled.");
setCurrentItem(0, true);
}
}
}
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