private bool IsItemVisible(float scrollPosition, RecycleItem item)
{
bool result = false;
View list = Container.GetParent() as View;
if (list == null)
{
return(result);
}
Vector2 visibleArea = new Vector2(Math.Abs(scrollPosition),
Math.Abs(scrollPosition) + (LayoutOrientation == Orientation.Horizontal ?
list.Size.Width : list.Size.Height)
);
float firstCheckPoint = LayoutOrientation == Orientation.Horizontal ? item.Position.X : item.Position.Y;
float secondCheckPoint = LayoutOrientation == Orientation.Horizontal ?
firstCheckPoint + item.Size.Width :
firstCheckPoint + item.Size.Height;
// Tizen.Log.Error("NUI", "[1p] "+visibleArea.X+ " =< "+firstCheckPoint+" =< "+visibleArea.Y+" ==== \n");
// Tizen.Log.Error("NUI", "[2p] "+visibleArea.X+ " =< "+secondCheckPoint+" =< "+visibleArea.Y+" ==== \n");
result = (firstCheckPoint >= visibleArea.X && firstCheckPoint <= visibleArea.Y) || (secondCheckPoint >= visibleArea.X && secondCheckPoint <= visibleArea.Y);
return(result);
}
/// <summary>
/// This is called to find out where items are lain out according to current scroll position.
/// </summary>
/// <param name="scrollPosition">Scroll position which is calculated by ScrollableBase</param>
/// <since_tizen> 8 </since_tizen>
/// This may be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API
public override void Layout(float scrollPosition)
{
int itemInGroup = LayoutOrientation == Orientation.Vertical ? Rows : Columns;
firstVisibleItemIndex = -1;
lastVisibleItemIndex = -1;
RecycleItem previousItem = null;
for (int i = 0; i < Container.Children.Count; i++)
{
RecycleItem item = Container.Children[i] as RecycleItem;
if (previousItem != null)
{
item.Position = LayoutOrientation == Orientation.Vertical ?
new Position(
(i % itemInGroup == 0 ?
previousItem.Position.X + (previousItem.CurrentSize.Width != 0 ?
previousItem.CurrentSize.Width :
previousItem.Size.Width) :
previousItem.Position.X),
(i % itemInGroup == 0 ?
0 :
previousItem.PositionY + (previousItem.CurrentSize.Height != 0 ?
previousItem.CurrentSize.Height :
previousItem.Size.Height))
) :
new Position(
(i % itemInGroup == 0 ?
0 :
previousItem.PositionX + (previousItem.CurrentSize.Width != 0 ?
previousItem.CurrentSize.Width :
previousItem.Size.Width)),
(i % itemInGroup == 0 ?
previousItem.Position.Y + (previousItem.CurrentSize.Height != 0 ?
previousItem.CurrentSize.Height :
previousItem.Size.Height) :
previousItem.Position.Y)
);
}
bool isVisible = IsItemVisible(scrollPosition, item);
if (isVisible)
{
firstVisibleItemIndex = firstVisibleItemIndex == -1 ? i : firstVisibleItemIndex;
lastVisibleItemIndex = i;
}
previousItem = item;
}
if (StepSize == 0)
{
StepSize = LayoutOrientation == Orientation.Vertical ? ItemSize.Width : ItemSize.Height;
}
}
/// <summary>
/// This is called to find out which items should be recycled according to current scroll position.
/// </summary>
/// <param name="scrollPosition">Scroll position which is calculated by ScrollableBase</param>
/// <returns>List of RecycleItems which should be recycled.</returns>
/// <since_tizen> 8 </since_tizen>
/// This may be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API
public override List <RecycleItem> Recycle(float scrollPosition)
{
List <RecycleItem> result = new List <RecycleItem>();
bool checkFront = (PrevScrollPosition - scrollPosition) > 0;
int itemInGroup = LayoutOrientation == Orientation.Vertical ? Rows : Columns;
if (checkFront)
{
int currentGroupNum = (int)(firstVisibleItemIndex / itemInGroup) + 1;
if (currentGroupNum > 2)
{
// Too many item is in front!!! move first item to back!!!!
for (int i = 0; i < itemInGroup; i++)
{
RecycleItem target = Container.Children[0] as RecycleItem;
if (target != null)
{
target.DataIndex = target.DataIndex + Container.Children.Count;
target.SiblingOrder = Container.Children.Count - 1;
result.Add(target);
}
}
}
}
else
{
int currentGroupNum = (int)(lastVisibleItemIndex / itemInGroup) + 1;
if (currentGroupNum < (int)(Container.Children.Count / itemInGroup) - 3)
{
for (int i = 0; i < itemInGroup; i++)
{
RecycleItem prevFirstItem = Container.Children[itemInGroup] as RecycleItem;
RecycleItem target = Container.Children[Container.Children.Count - 1] as RecycleItem;
if (prevFirstItem != null && target != null)
{
target.Position = new Position(
LayoutOrientation == Orientation.Vertical ? (prevFirstItem.Position.X - target.Size.Width) : prevFirstItem.Position.X,
LayoutOrientation == Orientation.Vertical ? prevFirstItem.Position.Y : (prevFirstItem.Position.Y - target.Size.Height)
);
target.DataIndex = target.DataIndex - Container.Children.Count;
target.SiblingOrder = 0;
result.Add(target);
}
}
}
}
PrevScrollPosition = scrollPosition;
return(result);
}
/// <summary>
/// This is called to find out where items are lain out according to current scroll position.
/// </summary>
/// <param name="scrollPosition">Scroll position which is calculated by ScrollableBase</param>
/// <since_tizen> 8 </since_tizen>
/// This may be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API
public override void Layout(float scrollPosition)
{
firstVisibleItemIndex = -1;
lastVisibleItemIndex = -1;
RecycleItem previousItem = null;
for (int i = 0; i < Container.Children.Count; i++)
{
RecycleItem item = Container.Children[i] as RecycleItem;
if (previousItem != null && item != null)
{
item.Position = LayoutOrientation == Orientation.Horizontal ?
new Position(
previousItem.Position.X + (previousItem.CurrentSize.Width != 0 ?
previousItem.CurrentSize.Width :
previousItem.Size.Width),
item.PositionY
) :
new Position(
item.PositionX,
previousItem.Position.Y + (previousItem.CurrentSize.Height != 0 ?
previousItem.CurrentSize.Height :
previousItem.Size.Height)
);
}
bool isVisible = IsItemVisible(scrollPosition, item);
if (isVisible)
{
firstVisibleItemIndex = firstVisibleItemIndex == -1 ? i : firstVisibleItemIndex;
lastVisibleItemIndex = i;
}
previousItem = item;
// Tizen.Log.Error("NUI","["+item.DataIndex+"] "+item.Position.Y+" ==== \n");
}
if (StepSize == 0)
{
StepSize = LayoutOrientation == Orientation.Horizontal ? ItemSize.Width : ItemSize.Height;
}
}
/// <summary>
/// This is called to find out which items should be recycled according to current scroll position.
/// </summary>
/// <param name="scrollPosition">Scroll position which is calculated by ScrollableBase</param>
/// <returns>List of RecycleItems which should be recycled.</returns>
/// <since_tizen> 8 </since_tizen>
/// This may be public opened in tizen_6.0 after ACR done. Before ACR, need to be hidden as inhouse API
public override List <RecycleItem> Recycle(float scrollPosition)
{
List <RecycleItem> result = new List <RecycleItem>();
bool checkFront = (PrevScrollPosition - scrollPosition) > 0;
if (checkFront)
{
if (firstVisibleItemIndex > 3)
{
// Too many item is in front!!! move first item to back!!!!
RecycleItem target = Container.Children[0] as RecycleItem;
if (target != null)
{
target.DataIndex = target.DataIndex + Container.Children.Count;
target.SiblingOrder = Container.Children.Count - 1;
result.Add(target);
}
}
}
else
{
if (lastVisibleItemIndex < Container.Children.Count - 3)
{
RecycleItem prevFirstItem = Container.Children[0] as RecycleItem;
RecycleItem target = Container.Children[Container.Children.Count - 1] as RecycleItem;
if (prevFirstItem != null && target != null)
{
target.Position = new Position(
LayoutOrientation == Orientation.Horizontal ? (prevFirstItem.Position.X - target.Size.Width) : prevFirstItem.Position.X,
LayoutOrientation == Orientation.Horizontal ? prevFirstItem.Position.Y : (prevFirstItem.Position.Y - target.Size.Height)
);
target.DataIndex = target.DataIndex - Container.Children.Count;
target.SiblingOrder = 0;
result.Add(target);
}
}
}
PrevScrollPosition = scrollPosition;
return(result);
}
public override View RequestNextFocusableView(View currentFocusedView, View.FocusDirection direction, bool loopEnabled)
{
View nextFocusedView = null;
int targetSibling = -1;
bool isHorizontal = LayoutOrientation == Orientation.Horizontal;
switch (direction)
{
case View.FocusDirection.Left:
{
targetSibling = isHorizontal ? currentFocusedView.SiblingOrder - 1 : targetSibling;
break;
}
case View.FocusDirection.Right:
{
targetSibling = isHorizontal ? currentFocusedView.SiblingOrder + 1 : targetSibling;
break;
}
case View.FocusDirection.Up:
{
targetSibling = isHorizontal ? targetSibling : currentFocusedView.SiblingOrder - 1;
break;
}
case View.FocusDirection.Down:
{
targetSibling = isHorizontal ? targetSibling : currentFocusedView.SiblingOrder + 1;
break;
}
}
if (targetSibling > -1 && targetSibling < Container.Children.Count)
{
RecycleItem candidate = Container.Children[targetSibling] as RecycleItem;
if (candidate != null && candidate.DataIndex >= 0 && candidate.DataIndex < DataCount)
{
nextFocusedView = candidate;
}
}
return(nextFocusedView);
}
private bool IsItemVisible(float scrollPosition, RecycleItem item)
{
bool result = false;
View list = Container.GetParent() as View;
Vector2 visibleArea = new Vector2(Math.Abs(scrollPosition),
Math.Abs(scrollPosition) + (LayoutOrientation == Orientation.Vertical ?
list.Size.Width : list.Size.Height)
);
float firstCheckPoint = LayoutOrientation == Orientation.Vertical ? item.Position.X : item.Position.Y;
float secondCheckPoint = LayoutOrientation == Orientation.Vertical ?
firstCheckPoint + item.Size.Width :
firstCheckPoint + item.Size.Height;
result = (firstCheckPoint >= visibleArea.X && firstCheckPoint <= visibleArea.Y) || (secondCheckPoint >= visibleArea.X && secondCheckPoint <= visibleArea.Y);
return(result);
}
private void InitializeItems()
{
for (int i = Children.Count - 1; i > -1; i--)
{
Children[i].Unparent();
notifications[i].Notified -= OnItemSizeChanged;
notifications.RemoveAt(i);
}
for (int i = 0; i < totalItemCount; i++)
{
RecycleItem item = adapter.CreateRecycleItem();
item.DataIndex = i;
item.Name = "[" + i + "] recycle";
if (i < adapter.Data.Count)
{
adapter.BindData(item);
}
Add(item);
PropertyNotification noti = item.AddPropertyNotification("size", PropertyCondition.Step(0.1f));
noti.Notified += OnItemSizeChanged;
notifications.Add(noti);
}
layoutManager.Layout(0.0f);
if (ScrollingDirection == Direction.Horizontal)
{
ContentContainer.SizeWidth = layoutManager.CalculateLayoutOrientationSize();
}
else
{
ContentContainer.SizeHeight = layoutManager.CalculateLayoutOrientationSize();
}
}
public override View GetNextFocusableView(View currentFocusedView, View.FocusDirection direction, bool loopEnabled)
{
View nextFocusedView = null;
if (!focusedView)
{
// If focusedView is null, find child which has previous data index
if (Children.Count > 0 && Adapter.Data.Count > 0)
{
for (int i = 0; i < Children.Count; i++)
{
RecycleItem item = Children[i] as RecycleItem;
if (item.DataIndex == prevFocusedDataIndex)
{
nextFocusedView = item;
break;
}
}
}
}
else
{
// If this is not first focus, request next focus to LayoutManager
if (LayoutManager != null)
{
nextFocusedView = LayoutManager.RequestNextFocusableView(currentFocusedView, direction, loopEnabled);
}
}
if (nextFocusedView)
{
// Check next focused view is inside of visible area.
// If it is not, move scroll position to make it visible.
Position scrollPosition = ContentContainer.CurrentPosition;
float targetPosition = -(ScrollingDirection == Direction.Horizontal ? scrollPosition.X : scrollPosition.Y);
float left = nextFocusedView.Position.X;
float right = nextFocusedView.Position.X + nextFocusedView.Size.Width;
float top = nextFocusedView.Position.Y;
float bottom = nextFocusedView.Position.Y + nextFocusedView.Size.Height;
float visibleRectangleLeft = -scrollPosition.X;
float visibleRectangleRight = -scrollPosition.X + Size.Width;
float visibleRectangleTop = -scrollPosition.Y;
float visibleRectangleBottom = -scrollPosition.Y + Size.Height;
if (ScrollingDirection == Direction.Horizontal)
{
if ((direction == View.FocusDirection.Left || direction == View.FocusDirection.Up) && left < visibleRectangleLeft)
{
targetPosition = left;
}
else if ((direction == View.FocusDirection.Right || direction == View.FocusDirection.Down) && right > visibleRectangleRight)
{
targetPosition = right - Size.Width;
}
}
else
{
if ((direction == View.FocusDirection.Up || direction == View.FocusDirection.Left) && top < visibleRectangleTop)
{
targetPosition = top;
}
else if ((direction == View.FocusDirection.Down || direction == View.FocusDirection.Right) && bottom > visibleRectangleBottom)
{
targetPosition = bottom - Size.Height;
}
}
focusedView = nextFocusedView;
if ((nextFocusedView as RecycleItem) != null)
{
prevFocusedDataIndex = (nextFocusedView as RecycleItem).DataIndex;
}
ScrollTo(targetPosition, true);
}
else
{
// If nextView is null, it means that we should move focus to outside of Control.
// Return FocusableView depending on direction.
switch (direction)
{
case View.FocusDirection.Left:
{
nextFocusedView = LeftFocusableView;
break;
}
case View.FocusDirection.Right:
{
nextFocusedView = RightFocusableView;
break;
}
case View.FocusDirection.Up:
{
nextFocusedView = UpFocusableView;
break;
}
case View.FocusDirection.Down:
{
nextFocusedView = DownFocusableView;
break;
}
}
if (nextFocusedView)
{
focusedView = null;
}
else
{
//If FocusableView doesn't exist, not move focus.
nextFocusedView = focusedView;
}
}
return(nextFocusedView);
}
public virtual void BindData(RecycleItem item)
{
}