@Override
protected synchronized void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (mAdapter == null) {
return;
}
if (mDataChanged) {
int oldCurrentX = mCurrentX;
initView();
removeAllViewsInLayout();
mNextX = oldCurrentX;
mDataChanged = false;
}
if (mScroller.computeScrollOffset()) {
int scrollx = mScroller.getCurrX();
mNextX = scrollx;
}
if (mNextX < 0) {
mNextX = 0;
mScroller.forceFinished(true);
return;
}
if (mNextX > mMaxX) {
mNextX = mMaxX;
mScroller.forceFinished(true);
return;
}
int dx = mCurrentX - mNextX;
removeNonVisibleItems(dx);
fillList(dx);
positionItems(dx);
mCurrentX = mNextX;
if (!mScroller.isFinished()) {
post(
new Runnable() {
@Override
public void run() {
requestLayout();
}
});
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
for (int i = 0; i < getChildCount(); i++) {
boundsRect.set(0, 0, getWidth(), getHeight());
View view = getChildAt(i);
int w, h;
w = view.getMeasuredWidth();
h = view.getMeasuredHeight();
Gravity.apply(mGravity, w, h, boundsRect, childRect);
view.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
}
}
/** {@inheritDoc} */
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
CFUtil.Log("onLayout");
layoutChildren();
// scrollTo(getScrollX(), getScrollY());
// final int parentLeft = getPaddingLeftWithForeground();
// final int parentRight = right - left - getPaddingRightWithForeground();
//
// final int parentTop = getPaddingTopWithForeground();
// final int parentBottom = bottom - top - getPaddingBottomWithForeground();
//
// mForegroundBoundsChanged = true;
//
// for (int i = 0; i < count; i++) {
// final View child = getChildAt(i);
// if (child.getVisibility() != GONE) {
// final LayoutParams lp = (LayoutParams) child.getLayoutParams();
//
// final int width = child.getMeasuredWidth();
// final int height = child.getMeasuredHeight();
//
// int childLeft;
// int childTop;
//
// int gravity = lp.gravity;
// if (gravity == -1) {
// gravity = DEFAULT_CHILD_GRAVITY;
// }
//
// final int layoutDirection = getLayoutDirection();
// final int absoluteGravity = Gravity.getAbsoluteGravity(gravity,
// layoutDirection);
// final int verticalGravity = gravity & Gravity.VERTICAL_GRAVITY_MASK;
//
// switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
// case Gravity.LEFT:
// childLeft = parentLeft + lp.leftMargin;
// break;
// case Gravity.CENTER_HORIZONTAL:
// childLeft = parentLeft + (parentRight - parentLeft - width) / 2 +
// lp.leftMargin - lp.rightMargin;
// break;
// case Gravity.RIGHT:
// childLeft = parentRight - width - lp.rightMargin;
// break;
// default:
// childLeft = parentLeft + lp.leftMargin;
// }
//
// switch (verticalGravity) {
// case Gravity.TOP:
// childTop = parentTop + lp.topMargin;
// break;
// case Gravity.CENTER_VERTICAL:
// childTop = parentTop + (parentBottom - parentTop - height) / 2 +
// lp.topMargin - lp.bottomMargin;
// break;
// case Gravity.BOTTOM:
// childTop = parentBottom - height - lp.bottomMargin;
// break;
// default:
// childTop = parentTop + lp.topMargin;
// }
//
// child.layout(childLeft, childTop, childLeft + width, childTop + height);
// }
// }
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
Log.i(TAG, "onLayout");
if (!mUserInteracting) {
return;
}
super.onLayout(changed, left, top, right, bottom);
View cv = mChildViews.get(mCurrent);
Point cvOffset;
if (!mResetLayout) {
// Move to next or previous if current is sufficiently off center
if (cv != null) {
cvOffset = subScreenSizeOffset(cv);
// cv.getRight() may be out of date with the current scale
// so add left to the measured width for the correct position
if (cv.getLeft() + cv.getMeasuredWidth() + cvOffset.x + GAP / 2 + mXScroll < getWidth() / 2
&& mCurrent + 1 < mAdapter.getCount()) {
postUnsettle(cv);
// post to invoke test for end of animation
// where we must set hq area for the new current view
post(this);
mCurrent++;
onMoveToChild(cv, mCurrent);
}
if (cv.getLeft() - cvOffset.x - GAP / 2 + mXScroll >= getWidth() / 2 && mCurrent > 0) {
postUnsettle(cv);
// post to invoke test for end of animation
// where we must set hq area for the new current view
post(this);
mCurrent--;
onMoveToChild(cv, mCurrent);
}
}
// Remove not needed children and hold them for reuse
int numChildren = mChildViews.size();
int childIndices[] = new int[numChildren];
for (int i = 0; i < numChildren; i++) childIndices[i] = mChildViews.keyAt(i);
for (int i = 0; i < numChildren; i++) {
int ai = childIndices[i];
if (ai < mCurrent - 1 || ai > mCurrent + 1) {
View v = mChildViews.get(ai);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
onNotInUse(v);
}
mViewCache.add(v);
removeViewInLayout(v);
mChildViews.remove(ai);
}
}
} else {
mResetLayout = false;
mXScroll = mYScroll = 0;
// Remove all children and hold them for reuse
int numChildren = mChildViews.size();
for (int i = 0; i < numChildren; i++) {
View v = mChildViews.valueAt(i);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
onNotInUse(v);
}
mViewCache.add(v);
removeViewInLayout(v);
}
mChildViews.clear();
// post to ensure generation of hq area
post(this);
}
// Ensure current view is present
int cvLeft, cvRight, cvTop, cvBottom;
boolean notPresent = (mChildViews.get(mCurrent) == null);
cv = getOrCreateChild(mCurrent);
// When the view is sub-screen-size in either dimension we
// offset it to center within the screen area, and to keep
// the views spaced out
cvOffset = subScreenSizeOffset(cv);
if (notPresent) {
// Main item not already present. Just place it top left
cvLeft = cvOffset.x;
cvTop = cvOffset.y;
} else {
// Main item already present. Adjust by scroll offsets
cvLeft = cv.getLeft() + mXScroll;
cvTop = cv.getTop() + mYScroll;
}
// Scroll values have been accounted for
mXScroll = mYScroll = 0;
cvRight = cvLeft + cv.getMeasuredWidth();
cvBottom = cvTop + cv.getMeasuredHeight();
if (!mUserInteracting && mScroller.isFinished()) {
Point corr = getCorrection(getScrollBounds(cvLeft, cvTop, cvRight, cvBottom));
cvRight += corr.x;
cvLeft += corr.x;
cvTop += corr.y;
cvBottom += corr.y;
} else if (cv.getMeasuredHeight() <= getHeight()) {
// When the current view is as small as the screen in height, clamp
// it vertically
Point corr = getCorrection(getScrollBounds(cvLeft, cvTop, cvRight, cvBottom));
cvTop += corr.y;
cvBottom += corr.y;
}
cv.layout(cvLeft, cvTop, cvRight, cvBottom);
if (mCurrent > 0) {
View lv = getOrCreateChild(mCurrent - 1);
Point leftOffset = subScreenSizeOffset(lv);
int gap = leftOffset.x + GAP + cvOffset.x;
lv.layout(
cvLeft - lv.getMeasuredWidth() - gap,
(cvBottom + cvTop - lv.getMeasuredHeight()) / 2,
cvLeft - gap,
(cvBottom + cvTop + lv.getMeasuredHeight()) / 2);
}
if (mCurrent + 1 < mAdapter.getCount()) {
View rv = getOrCreateChild(mCurrent + 1);
Point rightOffset = subScreenSizeOffset(rv);
int gap = cvOffset.x + GAP + rightOffset.x;
rv.layout(
cvRight + gap,
(cvBottom + cvTop - rv.getMeasuredHeight()) / 2,
cvRight + rv.getMeasuredWidth() + gap,
(cvBottom + cvTop + rv.getMeasuredHeight()) / 2);
}
invalidate();
}
@SuppressLint("WrongCall")
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (mAdapter == null) {
return;
}
// Force the OS to redraw this view
invalidate();
// If the data changed then reset everything and render from scratch at the same offset as last
// time
if (mDataChanged) {
int oldCurrentX = mCurrentX;
initView();
removeAllViewsInLayout();
mNextX = oldCurrentX;
mDataChanged = false;
}
// If restoring from a rotation
if (mRestoreX != null) {
mNextX = mRestoreX;
mRestoreX = null;
}
// If in a fling
if (mFlingTracker.computeScrollOffset()) {
// Compute the next position
mNextX = mFlingTracker.getCurrX();
}
// Prevent scrolling past 0 so you can't scroll past the end of the list to the left
if (mNextX < 0) {
mNextX = 0;
// Show an edge effect absorbing the current velocity
if (mEdgeGlowLeft.isFinished()) {
mEdgeGlowLeft.onAbsorb((int) determineFlingAbsorbVelocity());
}
mFlingTracker.forceFinished(true);
setCurrentScrollState(OnScrollStateChangedListener.ScrollState.SCROLL_STATE_IDLE);
} else if (mNextX > mMaxX) {
// Clip the maximum scroll position at mMaxX so you can't scroll past the end of the list to
// the right
mNextX = mMaxX;
// Show an edge effect absorbing the current velocity
if (mEdgeGlowRight.isFinished()) {
mEdgeGlowRight.onAbsorb((int) determineFlingAbsorbVelocity());
}
mFlingTracker.forceFinished(true);
setCurrentScrollState(OnScrollStateChangedListener.ScrollState.SCROLL_STATE_IDLE);
}
// Calculate our delta from the last time the view was drawn
int dx = mCurrentX - mNextX;
removeNonVisibleChildren(dx);
fillList(dx);
positionChildren(dx);
// Since the view has now been drawn, update our current position
mCurrentX = mNextX;
// If we have scrolled enough to lay out all views, then determine the maximum scroll position
// now
if (determineMaxX()) {
// Redo the layout pass since we now know the maximum scroll position
onLayout(changed, left, top, right, bottom);
return;
}
// If the fling has finished
if (mFlingTracker.isFinished()) {
// If the fling just ended
if (mCurrentScrollState == OnScrollStateChangedListener.ScrollState.SCROLL_STATE_FLING) {
setCurrentScrollState(OnScrollStateChangedListener.ScrollState.SCROLL_STATE_IDLE);
}
} else {
// Still in a fling so schedule the next frame
ViewCompat.postOnAnimation(this, mDelayedLayout);
}
}