/// <summary>
/// Add a view as a child and make sure it is measured (if necessary) and
/// positioned properly.
/// </summary>
/// <remarks>
/// Add a view as a child and make sure it is measured (if necessary) and
/// positioned properly.
/// </remarks>
/// <param name="child">The view to add</param>
/// <param name="position">The position of the view</param>
/// <param name="y">The y position relative to which this view will be positioned</param>
/// <param name="flow">
/// if true, align top edge to y. If false, align bottom edge
/// to y.
/// </param>
/// <param name="childrenLeft">Left edge where children should be positioned</param>
/// <param name="selected">Is this position selected?</param>
/// <param name="recycled">
/// Has this view been pulled from the recycle bin? If so it
/// does not need to be remeasured.
/// </param>
/// <param name="where">Where to add the item in the list</param>
private void setupChild(android.view.View child, int position, int y, bool flow,
int childrenLeft, bool selected, bool recycled, int where)
{
bool isSelected_1 = selected && shouldShowSelector();
bool updateChildSelected = isSelected_1 != child.isSelected();
int mode = mTouchMode;
bool isPressed_1 = mode > TOUCH_MODE_DOWN && mode < TOUCH_MODE_SCROLL && mMotionPosition
== position;
bool updateChildPressed = isPressed_1 != child.isPressed();
bool needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested(
);
// Respect layout params that are already in the view. Otherwise make
// some up...
android.widget.AbsListView.LayoutParams p = (android.widget.AbsListView.LayoutParams
)child.getLayoutParams();
if (p == null)
{
p = new android.widget.AbsListView.LayoutParams(android.view.ViewGroup.LayoutParams
.MATCH_PARENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 0);
}
p.viewType = mAdapter.getItemViewType(position);
if (recycled && !p.forceAdd)
{
attachViewToParent(child, where, p);
}
else
{
p.forceAdd = false;
addViewInLayout(child, where, p, true);
}
if (updateChildSelected)
{
child.setSelected(isSelected_1);
if (isSelected_1)
{
requestFocus();
}
}
if (updateChildPressed)
{
child.setPressed(isPressed_1);
}
if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null)
{
if (child is android.widget.Checkable)
{
((android.widget.Checkable)child).setChecked(mCheckStates.get(position));
}
else
{
if (getContext().getApplicationInfo().targetSdkVersion >= android.os.Build.VERSION_CODES
.HONEYCOMB)
{
child.setActivated(mCheckStates.get(position));
}
}
}
if (needToMeasure)
{
int childHeightSpec = android.view.ViewGroup.getChildMeasureSpec(android.view.View
.MeasureSpec.makeMeasureSpec(0, android.view.View.MeasureSpec.UNSPECIFIED), 0, p
.height);
int childWidthSpec = android.view.ViewGroup.getChildMeasureSpec(android.view.View
.MeasureSpec.makeMeasureSpec(mColumnWidth, android.view.View.MeasureSpec.EXACTLY
), 0, p.width);
child.measure(childWidthSpec, childHeightSpec);
}
else
{
cleanupLayoutState(child);
}
int w = child.getMeasuredWidth();
int h = child.getMeasuredHeight();
int childLeft;
int childTop = flow ? y : y - h;
int layoutDirection = getResolvedLayoutDirection();
int absoluteGravity = android.view.Gravity.getAbsoluteGravity(mGravity, layoutDirection
);
switch (absoluteGravity & android.view.Gravity.HORIZONTAL_GRAVITY_MASK)
{
case android.view.Gravity.LEFT:
{
childLeft = childrenLeft;
break;
}
case android.view.Gravity.CENTER_HORIZONTAL:
{
childLeft = childrenLeft + ((mColumnWidth - w) / 2);
break;
}
case android.view.Gravity.RIGHT:
{
childLeft = childrenLeft + mColumnWidth - w;
break;
}
default:
{
childLeft = childrenLeft;
break;
}
}
if (needToMeasure)
{
int childRight = childLeft + w;
int childBottom = childTop + h;
child.layout(childLeft, childTop, childRight, childBottom);
}
else
{
child.offsetLeftAndRight(childLeft - child.getLeft());
child.offsetTopAndBottom(childTop - child.getTop());
}
if (mCachingStarted)
{
child.setDrawingCacheEnabled(true);
}
if (recycled && (((android.widget.AbsListView.LayoutParams)child.getLayoutParams(
)).scrappedFromPosition) != position)
{
child.jumpDrawablesToCurrentState();
}
}
protected internal override void onMeasure(int widthMeasureSpec, int heightMeasureSpec
)
{
// Sets up mListPadding
base.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthMode = android.view.View.MeasureSpec.getMode(widthMeasureSpec);
int heightMode = android.view.View.MeasureSpec.getMode(heightMeasureSpec);
int widthSize = android.view.View.MeasureSpec.getSize(widthMeasureSpec);
int heightSize = android.view.View.MeasureSpec.getSize(heightMeasureSpec);
if (widthMode == android.view.View.MeasureSpec.UNSPECIFIED)
{
if (mColumnWidth > 0)
{
widthSize = mColumnWidth + mListPadding.left + mListPadding.right;
}
else
{
widthSize = mListPadding.left + mListPadding.right;
}
widthSize += getVerticalScrollbarWidth();
}
int childWidth = widthSize - mListPadding.left - mListPadding.right;
bool didNotInitiallyFit = determineColumns(childWidth);
int childHeight = 0;
int childState = 0;
mItemCount = mAdapter == null ? 0 : mAdapter.getCount();
int count = mItemCount;
if (count > 0)
{
android.view.View child = obtainView(0, mIsScrap);
android.widget.AbsListView.LayoutParams p = (android.widget.AbsListView.LayoutParams
)child.getLayoutParams();
if (p == null)
{
p = new android.widget.AbsListView.LayoutParams(android.view.ViewGroup.LayoutParams
.MATCH_PARENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 0);
child.setLayoutParams(p);
}
p.viewType = mAdapter.getItemViewType(0);
p.forceAdd = true;
int childHeightSpec = getChildMeasureSpec(android.view.View.MeasureSpec.makeMeasureSpec
(0, android.view.View.MeasureSpec.UNSPECIFIED), 0, p.height);
int childWidthSpec = getChildMeasureSpec(android.view.View.MeasureSpec.makeMeasureSpec
(mColumnWidth, android.view.View.MeasureSpec.EXACTLY), 0, p.width);
child.measure(childWidthSpec, childHeightSpec);
childHeight = child.getMeasuredHeight();
childState = combineMeasuredStates(childState, child.getMeasuredState());
if (mRecycler.shouldRecycleViewType(p.viewType))
{
mRecycler.addScrapView(child, -1);
}
}
if (heightMode == android.view.View.MeasureSpec.UNSPECIFIED)
{
heightSize = mListPadding.top + mListPadding.bottom + childHeight + getVerticalFadingEdgeLength
() * 2;
}
if (heightMode == android.view.View.MeasureSpec.AT_MOST)
{
int ourSize = mListPadding.top + mListPadding.bottom;
int numColumns = mNumColumns;
{
for (int i = 0; i < count; i += numColumns)
{
ourSize += childHeight;
if (i + numColumns < count)
{
ourSize += mVerticalSpacing;
}
if (ourSize >= heightSize)
{
ourSize = heightSize;
break;
}
}
}
heightSize = ourSize;
}
if (widthMode == android.view.View.MeasureSpec.AT_MOST && mRequestedNumColumns !=
AUTO_FIT)
{
int ourSize = (mRequestedNumColumns * mColumnWidth) + ((mRequestedNumColumns - 1)
* mHorizontalSpacing) + mListPadding.left + mListPadding.right;
if (ourSize > widthSize || didNotInitiallyFit)
{
widthSize |= MEASURED_STATE_TOO_SMALL;
}
}
setMeasuredDimension(widthSize, heightSize);
mWidthMeasureSpec = widthMeasureSpec;
}