private int layoutChild(LayoutState.View child, int markerLine, LayoutManager.Direction direction, SectionData sd, LayoutState state)
{
int height = mLayoutManager.GetDecoratedMeasuredHeight(child.view);
int width = mLayoutManager.GetDecoratedMeasuredWidth(child.view);
int left = state.isLTR ? sd.contentStart : sd.contentEnd;
int right = left + width;
int top;
int bottom;
if (direction == LayoutManager.Direction.END)
{
top = markerLine;
bottom = top + height;
}
else
{
bottom = markerLine;
top = bottom - height;
}
mLayoutManager.LayoutDecorated(child.view, left, top, right, bottom);
if (direction == LayoutManager.Direction.END)
{
markerLine = mLayoutManager.GetDecoratedBottom(child.view);
}
else
{
markerLine = mLayoutManager.GetDecoratedTop(child.view);
}
return(markerLine);
}
/// <summary>
/// Fill a row.
/// </summary>
/// <param name="markerLine"> Line indicating the top edge of the row. </param>
/// <param name="anchorPosition"> Position of the first view in the row. </param>
/// <param name="direction"> Direction of edge to fill towards. </param>
/// <param name="measureRowItems"> Measure the row items. </param>
/// <param name="sd"> Section data. </param>
/// <param name="state"> Layout state. </param>
/// <returns> The height of the new row. </returns>
public int fillRow(int markerLine, int anchorPosition, LayoutManager.Direction direction, bool measureRowItems, SectionData sd, LayoutState state)
{
int rowHeight = 0;
LayoutState.View[] views = new LayoutState.View[mNumColumns];
for (int i = 0; i < mNumColumns; i++)
{
int position = anchorPosition + i;
if (position >= state.recyclerState.ItemCount)
{
break;
}
LayoutState.View view = state.GetView(position);
if (view.LayoutParams.FirstPosition != sd.firstPosition)
{
state.CacheView(position, view.view);
break;
}
if (measureRowItems)
{
MeasureChild(view, sd);
}
else
{
state.DecacheView(i + anchorPosition);
}
rowHeight = Math.Max(rowHeight, mLayoutManager.GetDecoratedMeasuredHeight(view.view));
views[i] = view;
}
bool directionIsStart = direction == LayoutManager.Direction.START;
if (directionIsStart)
{
markerLine -= rowHeight;
}
for (int i = 0; i < mNumColumns; i++)
{
int col = directionIsStart ? mNumColumns - i - 1 : i;
if (views[col] == null)
{
continue;
}
LayoutChild(views[col], markerLine, col, rowHeight, sd, state);
AddView(views[col], col + anchorPosition, direction, state);
}
return(rowHeight);
}
protected int AddView(LayoutState.View child, int position, LayoutManager.Direction direction, LayoutState state)
{
int addIndex;
if (direction == LayoutManager.Direction.START)
{
addIndex = 0;
}
else
{
addIndex = mLayoutManager.ChildCount;
}
state.DecacheView(position);
mLayoutManager.AddView(child.view, addIndex);
return(addIndex);
}