@Override
protected void onSizeChanged(int w, int h) {
super.onSizeChanged(w, h);
boolean isLandscape = isLandscape();
int newColumnCount = isLandscape ? mColumnCountLandscape : mColumnCountPortrait;
if (mColumnCount != newColumnCount) {
mColumnCount = newColumnCount;
mColumnWidth = calculateColumnWidth(w);
mColumnTops = new int[mColumnCount];
mColumnBottoms = new int[mColumnCount];
mColumnLefts = new int[mColumnCount];
mDistanceToTop = 0;
// rebuild the columns
initColumnTopsAndBottoms();
initColumnLefts();
// if we have data
if (getCount() > 0 && mPositionData.size() > 0) {
onColumnSync();
}
requestLayout();
}
}
private void offsetGridHeaderFooter(
final View child,
final int position,
final boolean flowDown,
final int childrenLeft,
final int childTop) {
// offset the top and bottom of all our columns
// if it's the footer we want it below the lowest child bottom
int gridChildTop;
int gridChildBottom;
if (flowDown) {
gridChildTop = getLowestPositionedBottom();
gridChildBottom = gridChildTop + getChildHeight(child);
} else {
gridChildBottom = getHighestPositionedTop();
gridChildTop = gridChildBottom - getChildHeight(child);
}
for (int i = 0; i < mColumnCount; i++) {
updateColumnTopIfNeeded(i, gridChildTop);
updateColumnBottomIfNeeded(i, gridChildBottom);
}
super.onOffsetChild(child, position, flowDown, childrenLeft, gridChildTop);
}
@Override
protected void onMeasureChild(final View child, final LayoutParams layoutParams) {
final int viewType = layoutParams.viewType;
final int position = layoutParams.position;
if (viewType == ITEM_VIEW_TYPE_HEADER_OR_FOOTER || viewType == ITEM_VIEW_TYPE_IGNORE) {
// for headers and weird ignored views
super.onMeasureChild(child, layoutParams);
} else {
if (DBG)
Log.d(TAG, "onMeasureChild BEFORE position:" + position + " h:" + getMeasuredHeight());
// measure it to the width of our column.
int childWidthSpec = MeasureSpec.makeMeasureSpec(mColumnWidth, MeasureSpec.EXACTLY);
int childHeightSpec;
if (layoutParams.height > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(layoutParams.height, MeasureSpec.EXACTLY);
} else {
childHeightSpec =
MeasureSpec.makeMeasureSpec(LayoutParams.WRAP_CONTENT, MeasureSpec.UNSPECIFIED);
}
child.measure(childWidthSpec, childHeightSpec);
}
final int childHeight = getChildHeight(child);
setPositionHeightRatio(position, childHeight);
if (DBG) Log.d(TAG, "onMeasureChild AFTER position:" + position + " h:" + childHeight);
}
@Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mColumnCount <= 0) {
boolean isLandscape = isLandscape();
mColumnCount = isLandscape ? mColumnCountLandscape : mColumnCountPortrait;
}
// our column width is the width of the listview
// minus it's padding
// minus the total items margin
// divided by the number of columns
mColumnWidth = calculateColumnWidth(getMeasuredWidth());
if (mColumnTops == null || mColumnTops.length != mColumnCount) {
mColumnTops = new int[mColumnCount];
initColumnTops();
}
if (mColumnBottoms == null || mColumnBottoms.length != mColumnCount) {
mColumnBottoms = new int[mColumnCount];
initColumnBottoms();
}
if (mColumnLefts == null || mColumnLefts.length != mColumnCount) {
mColumnLefts = new int[mColumnCount];
initColumnLefts();
}
}
@Override
protected void adjustViewsAfterFillGap(final boolean down) {
super.adjustViewsAfterFillGap(down);
// fix vertical gaps when hitting the top after a rotate
// only when scrolling back up!
if (!down) {
alignTops();
}
}
@SuppressWarnings("unchecked")
@Override
public void onRestoreInstanceState(Parcelable state) {
GridListSavedState ss = (GridListSavedState) state;
mColumnCount = ss.columnCount;
mColumnTops = ss.columnTops;
mColumnBottoms = new int[mColumnCount];
mPositionData = ss.positionData;
mNeedSync = true;
super.onRestoreInstanceState(ss);
}
@Override
protected void onChildCreated(final int position, final boolean flowDown) {
super.onChildCreated(position, flowDown);
if (!isHeaderOrFooter(position)) {
// do we already have a column for this position?
final int column = getChildColumn(position, flowDown);
setPositionColumn(position, column);
if (DBG) Log.d(TAG, "onChildCreated position:" + position + " is in column:" + column);
} else {
setPositionIsHeaderFooter(position);
}
}
private void offsetGridChild(
final View child,
final int position,
final boolean flowDown,
final int childrenLeft,
final int childTop) {
// stash the bottom and the top if it's higher positioned
int column = getPositionColumn(position);
int gridChildTop;
int gridChildBottom;
int childTopMargin = getChildTopMargin(position);
int childBottomMargin = getChildBottomMargin();
int verticalMargins = childTopMargin + childBottomMargin;
if (flowDown) {
gridChildTop = mColumnBottoms[column]; // the next items top is the
// last items bottom
gridChildBottom = gridChildTop + (getChildHeight(child) + verticalMargins);
} else {
gridChildBottom = mColumnTops[column]; // the bottom of the next
// column up is our top
gridChildTop = gridChildBottom - (getChildHeight(child) + verticalMargins);
}
if (DBG)
Log.d(
TAG,
"onOffsetChild position:"
+ position
+ " column:"
+ column
+ " childTop:"
+ childTop
+ " gridChildTop:"
+ gridChildTop
+ " gridChildBottom:"
+ gridChildBottom);
// we also know the column of this view so let's stash it in the
// view's layout params
GridLayoutParams layoutParams = (GridLayoutParams) child.getLayoutParams();
layoutParams.column = column;
updateColumnBottomIfNeeded(column, gridChildBottom);
updateColumnTopIfNeeded(column, gridChildTop);
super.onOffsetChild(child, position, flowDown, childrenLeft, gridChildTop + childTopMargin);
}
@Override
protected void onChildrenDetached(final int start, final int count) {
super.onChildrenDetached(start, count);
// go through our remaining views and sync the top and bottom stash.
// Repair the top and bottom column boundaries from the views we still
// have
Arrays.fill(mColumnTops, Integer.MAX_VALUE);
Arrays.fill(mColumnBottoms, 0);
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child != null) {
final LayoutParams childParams = (LayoutParams) child.getLayoutParams();
if (childParams.viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER
&& childParams instanceof GridLayoutParams) {
GridLayoutParams layoutParams = (GridLayoutParams) childParams;
int column = layoutParams.column;
int position = layoutParams.position;
final int childTop = child.getTop();
if (childTop < mColumnTops[column]) {
mColumnTops[column] = childTop - getChildTopMargin(position);
}
final int childBottom = child.getBottom();
if (childBottom > mColumnBottoms[column]) {
mColumnBottoms[column] = childBottom + getChildBottomMargin();
}
} else {
// the header and footer here
final int childTop = child.getTop();
final int childBottom = child.getBottom();
for (int col = 0; col < mColumnCount; col++) {
if (childTop < mColumnTops[col]) {
mColumnTops[col] = childTop;
}
if (childBottom > mColumnBottoms[col]) {
mColumnBottoms[col] = childBottom;
}
}
}
}
}
}
@Override
protected void onSizeChanged(final int w, final int h, final int oldw, final int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
onSizeChanged(w, h);
}
@Override
protected void offsetChildrenTopAndBottom(final int offset) {
super.offsetChildrenTopAndBottom(offset);
offsetAllColumnsTopAndBottom(offset);
offsetDistanceToTop(offset);
}
@Override
protected void layoutChildren() {
preLayoutChildren();
super.layoutChildren();
}
