public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
{
GroupInfo info = GetGroupInfo(groupPosition);
if (info.animating)
{
// If this group is animating, return the a DummyView...
if (convertView is DummyView == false)
{
convertView = new DummyView(parent.Context);
convertView.LayoutParameters = new LayoutParams(LayoutParams.MatchParent, 0);
}
if (childPosition < info.firstChildPosition)
{
convertView.LayoutParameters.Height = 0;
return(convertView);
}
ExpandableListView listView = (ExpandableListView)parent;
DummyView dummyView = (DummyView)convertView;
// Clear the views that the dummy view draws.
dummyView.ClearViews();
// Set the style of the divider
dummyView.SetDivider(listView.Divider, parent.MeasuredWidth, listView.DividerHeight);
// Make measure specs to measure child views
int measureSpecW = MeasureSpec.MakeMeasureSpec(parent.Width, MeasureSpecMode.Exactly);
int measureSpecH = MeasureSpec.MakeMeasureSpec(0, MeasureSpecMode.Unspecified);
int totalHeight = 0;
int clipHeight = parent.Height;
int len = GetRealChildrenCount(groupPosition);
for (int i = info.firstChildPosition; i < len; i++)
{
View childView = GetRealChildView(groupPosition, i, (i == len - 1), null, parent);
LayoutParams p = (LayoutParams)childView.LayoutParameters;
if (p == null)
{
p = (LayoutParams)GenerateDefaultLayoutParams();
childView.LayoutParameters = p;
}
int lpHeight = p.Height;
int childHeightSpec;
if (lpHeight > 0)
{
childHeightSpec = MeasureSpec.MakeMeasureSpec(lpHeight, MeasureSpecMode.Exactly);
}
else
{
childHeightSpec = measureSpecH;
}
childView.Measure(measureSpecW, childHeightSpec);
totalHeight += childView.MeasuredHeight;
if (totalHeight < clipHeight)
{
// we only need to draw enough views to fool the user...
dummyView.AddFakeView(childView);
}
else
{
dummyView.AddFakeView(childView);
// if this group has too many views, we don't want to
// calculate the height of everything... just do a light
// approximation and break
int averageHeight = totalHeight / (i + 1);
totalHeight += (len - i - 1) * averageHeight;
break;
}
}
int state;
if (dummyView.Tag == null)
{
state = STATE_IDLE;
}
else
{
state = ((Integer)dummyView.Tag).IntValue();
}
if (info.expanding && state != STATE_EXPANDING)
{
ExpandAnimation ani = new ExpandAnimation(dummyView, 0, totalHeight, info);
ani.Duration = ANIMATION_DURATION;
ExpandableAnimationListener expandAnimationListener = new ExpandableAnimationListener(this, state, groupPosition, dummyView, listView, info);
ani.SetAnimationListener(expandAnimationListener);
dummyView.StartAnimation(ani);
dummyView.Tag = STATE_EXPANDING;
}
else if (!info.expanding && state != STATE_COLLAPSING)
{
if (info.dummyHeight == -1)
{
info.dummyHeight = totalHeight;
}
ExpandAnimation ani = new ExpandAnimation(dummyView, info.dummyHeight, 0, info);
ani.Duration = ANIMATION_DURATION;
ExpandableAnimationListener collapseAnimationListener = new ExpandableAnimationListener(this, state, groupPosition, dummyView, listView, info);
ani.SetAnimationListener(collapseAnimationListener);
dummyView.StartAnimation(ani);
dummyView.Tag = STATE_COLLAPSING;
}
return(convertView);
}
else
{
return(GetRealChildView(groupPosition, childPosition, isLastChild, convertView, parent));
}
}
