/// <summary><p>Measures the preferred width of each child, including its margins.</p>
/// </summary>
/// <param name="widthMeasureSpec">the width constraint imposed by our parent</param>
/// <returns>
/// an array of integers corresponding to the width of each cell, or
/// column, in this row
/// <hide></hide>
/// </returns>
internal virtual int[] getColumnsWidths(int widthMeasureSpec)
{
int numColumns = getVirtualChildCount();
if (mColumnWidths == null || numColumns != mColumnWidths.Length)
{
mColumnWidths = new int[numColumns];
}
int[] columnWidths = mColumnWidths;
{
for (int i = 0; i < numColumns; i++)
{
android.view.View child = getVirtualChildAt(i);
if (child != null && child.getVisibility() != GONE)
{
android.widget.TableRow.LayoutParams layoutParams = (android.widget.TableRow.LayoutParams
)child.getLayoutParams();
if (layoutParams.span == 1)
{
int spec;
switch (layoutParams.width)
{
case android.view.ViewGroup.LayoutParams.WRAP_CONTENT:
{
spec = getChildMeasureSpec(widthMeasureSpec, 0, android.view.ViewGroup.LayoutParams
.WRAP_CONTENT);
break;
}
case android.view.ViewGroup.LayoutParams.MATCH_PARENT:
{
spec = android.view.View.MeasureSpec.makeMeasureSpec(0, android.view.View.MeasureSpec
.UNSPECIFIED);
break;
}
default:
{
spec = android.view.View.MeasureSpec.makeMeasureSpec(layoutParams.width, android.view.View
.MeasureSpec.EXACTLY);
break;
}
}
child.measure(spec, spec);
int width = child.getMeasuredWidth() + layoutParams.leftMargin + layoutParams.rightMargin;
columnWidths[i] = width;
}
else
{
columnWidths[i] = 0;
}
}
else
{
columnWidths[i] = 0;
}
}
}
return(columnWidths);
}
internal override int getChildrenSkipCount(android.view.View child, int index)
{
android.widget.TableRow.LayoutParams layoutParams = (android.widget.TableRow.LayoutParams
)child.getLayoutParams();
// when the span is 1 (default), we need to skip 0 child
return(layoutParams.span - 1);
}
private void mapIndexAndColumns()
{
if (mColumnToChildIndex == null)
{
int virtualCount = 0;
int count = getChildCount();
mColumnToChildIndex = new android.util.SparseIntArray();
android.util.SparseIntArray columnToChild = mColumnToChildIndex;
{
for (int i = 0; i < count; i++)
{
android.view.View child = getChildAt(i);
android.widget.TableRow.LayoutParams layoutParams = (android.widget.TableRow.LayoutParams
)child.getLayoutParams();
if (layoutParams.column >= virtualCount)
{
virtualCount = layoutParams.column;
}
{
for (int j = 0; j < layoutParams.span; j++)
{
columnToChild.put(virtualCount++, i);
}
}
}
}
mNumColumns = virtualCount;
}
}
internal override void measureChildBeforeLayout(android.view.View child, int childIndex
, int widthMeasureSpec, int totalWidth, int heightMeasureSpec, int totalHeight)
{
if (mConstrainedColumnWidths != null)
{
android.widget.TableRow.LayoutParams lp = (android.widget.TableRow.LayoutParams)child
.getLayoutParams();
int measureMode = android.view.View.MeasureSpec.EXACTLY;
int columnWidth = 0;
int span = lp.span;
int[] constrainedColumnWidths = mConstrainedColumnWidths;
{
for (int i = 0; i < span; i++)
{
columnWidth += constrainedColumnWidths[childIndex + i];
}
}
int gravity = lp.gravity;
bool isHorizontalGravity = android.view.Gravity.isHorizontal(gravity);
if (isHorizontalGravity)
{
measureMode = android.view.View.MeasureSpec.AT_MOST;
}
// no need to care about padding here,
// ViewGroup.getChildMeasureSpec() would get rid of it anyway
// because of the EXACTLY measure spec we use
int childWidthMeasureSpec = android.view.View.MeasureSpec.makeMeasureSpec(System.Math.Max
(0, columnWidth - lp.leftMargin - lp.rightMargin), measureMode);
int childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, mPaddingTop +
mPaddingBottom + lp.topMargin + lp.bottomMargin + totalHeight, lp.height);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
if (isHorizontalGravity)
{
int childWidth = child.getMeasuredWidth();
lp.mOffset[android.widget.TableRow.LayoutParams.LOCATION_NEXT] = columnWidth - childWidth;
int layoutDirection = getResolvedLayoutDirection();
int absoluteGravity = android.view.Gravity.getAbsoluteGravity(gravity, layoutDirection
);
switch (absoluteGravity & android.view.Gravity.HORIZONTAL_GRAVITY_MASK)
{
case android.view.Gravity.LEFT:
{
// don't offset on X axis
break;
}
case android.view.Gravity.RIGHT:
{
lp.mOffset[android.widget.TableRow.LayoutParams.LOCATION] = lp.mOffset[android.widget.TableRow
.LayoutParams.LOCATION_NEXT];
break;
}
case android.view.Gravity.CENTER_HORIZONTAL:
{
lp.mOffset[android.widget.TableRow.LayoutParams.LOCATION] = lp.mOffset[android.widget.TableRow
.LayoutParams.LOCATION_NEXT] / 2;
break;
}
}
}
else
{
lp.mOffset[android.widget.TableRow.LayoutParams.LOCATION] = lp.mOffset[android.widget.TableRow
.LayoutParams.LOCATION_NEXT] = 0;
}
}
else
{
// fail silently when column widths are not available
base.measureChildBeforeLayout(child, childIndex, widthMeasureSpec, totalWidth, heightMeasureSpec
, totalHeight);
}
}
