public CustomAnimateListener(Number State, int groupPosition, View dumyView, GroupInfo info, AnimatedExpandableListView listView,
AnimatedExpandableListAdapter parent, Action onListViewAnimationEnd)
{
this._state = State;
this._groupPostion = groupPosition;
this._dummyView = dumyView;
_listView = listView;
_parent = parent;
_info = info;
OnListViewAnimationEnd = onListViewAnimationEnd;
}
/**
* Override {@link #getChildView(int, int, bool, View, ViewGroup)} instead.
*/
public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
{
try
{
GroupInfo info = getGroupInfo(groupPosition);
info.ChildViewCallCount += 1;;
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 AbsListView.LayoutParams(LayoutParams.MatchParent, 0);
}
if (childPosition < info.firstChildPosition)
{
// The reason why we do this is to support the collapse
// this group when the group view is not visible but the
// children of this group are. When notifyDataSetChanged
// is called, the ExpandableListView tries to keep the
// list position the same by saving the first visible item
// and jumping back to that item after the views have been
// refreshed. Now the problem is, if a group has 2 items
// and the first visible item is the 2nd child of the group
// and this group is collapsed, then the dummy view will be
// used for the group. But now the group only has 1 item
// which is the dummy view, thus when the ListView is trying
// to restore the scroll position, it will try to jump to
// the second item of the group. But this group no longer
// has a second item, so it is forced to jump to the next
// group. This will cause a very ugly visual glitch. So
// the way that we counteract this is by creating as many
// dummy views as we need to maintain the scroll position
// of the ListView after notifyDataSetChanged has been
// called.
convertView.LayoutParameters.Height = 0;
return(convertView);
}
AnimatedExpandableListView listView = (AnimatedExpandableListView)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 = (AbsListView.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;
}
}
object o = dummyView.Tag;
Java.Lang.Number state = o == null ? STATE_IDLE : (Java.Lang.Number)o;
if (info.expanding && state != STATE_EXPANDING && info.ChildViewCallCount <= 1) //&& info.ChildViewCallCount<=1
{
//new System.Threading.Thread(new System.Threading.ThreadStart(delegate
//{
// _activity.RunOnUiThread(() =>
//{
ExpandAnimation ani = new ExpandAnimation(dummyView, 0, totalHeight, info, _activity, this);
ani.Duration = this.parent.getAnimationDuration();
//ani.SetInterpolator(_activity, Android.Resource.Animation.LinearInterpolator);
ani.Interpolator = new AccelerateDecelerateInterpolator();
ani.SetAnimationListener(new CustomAnimateListener(STATE_EXPANDING, groupPosition, dummyView, info, listView,
this, listView.OnAnimationEnd));
//ani.FillAfter = false;
dummyView.StartAnimation(ani);
//ani.RepeatCount = Animation.StartOnFirstFrame;
/*****************Another Animation Implementation*****************
* ValueAnimator animator = ValueAnimator.OfInt(0, totalHeight);
* animator.SetDuration(this.parent.getAnimationDuration());
* animator.SetInterpolator(new AccelerateDecelerateInterpolator());
*
* animator.Update += (object sender, ValueAnimator.AnimatorUpdateEventArgs e) =>
* {
*
*
* var value = (int)animator.AnimatedValue;
* if (factor != value)
* {
* factor = value;
* ViewGroup.LayoutParams layoutParams = dummyView.LayoutParameters;
* layoutParams.Height = value;
* dummyView.LayoutParameters = layoutParams;
* Console.System.Diagnostics.Debug.WriteLine("Value: " + value.ToString());
* }
*
* };
* animator.AddListener(new CustomAnimateListener(STATE_EXPANDING, groupPosition, dummyView, info, listView, this));
* * ************************/
dummyView.Tag = STATE_EXPANDING;
// });
//})).Start();
}
else if (!info.expanding && state != STATE_COLLAPSING && info.ChildViewCallCount <= 1) //&& info.ChildViewCallCount<=1
{
if (info.dummyHeight == -1)
{
info.dummyHeight = totalHeight;
}
//new System.Threading.Thread(new System.Threading.ThreadStart(delegate
//{
// _activity.RunOnUiThread(() =>
//{
ExpandAnimation ani = new ExpandAnimation(dummyView, info.dummyHeight, 0, info, _activity, this);
ani.Duration = this.parent.getAnimationDuration();
//ani.SetInterpolator(_activity, Android.Resource.Animation.AccelerateInterpolator);
ani.Interpolator = new AccelerateDecelerateInterpolator();
ani.SetAnimationListener(new CustomAnimateListener(STATE_COLLAPSING, groupPosition, dummyView, info, listView,
this, listView.OnAnimationEnd));
long i = ani.ComputeDurationHint();
dummyView.StartAnimation(ani);
/**********************************Another animation implementation********************
* ValueAnimator animator = ValueAnimator.OfInt(totalHeight, 0);
* animator.SetDuration(this.parent.getAnimationDuration());
* animator.SetInterpolator(new AccelerateDecelerateInterpolator());
* animator.Update += (object sender, ValueAnimator.AnimatorUpdateEventArgs e) =>
* {
* var value = (int)animator.AnimatedValue;
* if (factor != value)
* {
* factor = value;
* ViewGroup.LayoutParams layoutParams = dummyView.LayoutParameters;
* layoutParams.Height = value;
* dummyView.LayoutParameters = layoutParams;
* Console.System.Diagnostics.Debug.WriteLine("Value: " + value.ToString());
* }
* };
* animator.AddListener(new CustomAnimateListener(STATE_COLLAPSING,groupPosition,dummyView,info,listView,this));
* animator.Start();
* ****************************************/
dummyView.Tag = STATE_COLLAPSING;
// });
//})).Start();
}
return(convertView);
}
else
{
info.ChildViewCallCount = 0;
return(getRealChildView(groupPosition, childPosition, isLastChild, convertView, parent));
}
}
catch (System.Exception ex)
{
string s = ex.Message;
CustomLogger.CustomLog("From Activity: " + BitopiSingelton.Instance.CurrentActivity + "\nMessage: " + ex.Message + "\nStack Trace: " + ex.StackTrace + "\n\n", "", BitopiSingelton.Instance.User != null ?
BitopiSingelton.Instance.User.UserName : "");
return(null);
}
}
public void setParent(AnimatedExpandableListView parent)
{
this.parent = parent;
}