public void RemoveObjectAtIndex(int index,GridViewItemAnimation animation)
{
Debug.Assert((index >= 0 && index < numberTotalItems), "Invalid index specified");
GridViewCell cell = CellForItemAtIndex(index);
for (int i = index + 1; i < numberTotalItems; i++)
{
GridViewCell oldView = CellForItemAtIndex(i);
oldView.Tag = oldView.Tag - 1;
}
if (cell!=null)
cell.Tag = kTagOffset - 1;
numberTotalItems--;
bool shouldScroll = animation.HasFlag(GridViewItemAnimation.Scroll);
bool animate = animation.HasFlag(GridViewItemAnimation.Fade);
//bool shouldScroll = animation == GridViewItemAnimation.Scroll;
//bool animate = animation == GridViewItemAnimation.Fade;
UIView.Animate(animate ? kDefaultAnimationDuration : 0.0f,0,kDefaultAnimationOptions,
delegate
{
if (cell!=null)
{
cell.ContentView.Alpha = 0.3f;
cell.Alpha = 0.0f;
}
if (shouldScroll)
{
ScrollToObjectAtIndex(index,GridViewScrollPosition.None,animate);
}
RecomputeSizeAnimated((animation != GridViewItemAnimation.None));
},
delegate
{
if (cell!=null)
cell.ContentView.Alpha = 1.0f;
QueueReusableCell(cell);
if (cell!=null)
cell.RemoveFromSuperview();
firstPositionLoaded = lastPositionLoaded = GMGV_INVALID_POSITION;
LoadRequiredItems();
RelayoutItemsAnimated(animate);
});
SetSubviewsCacheAsInvalid();
}
public void ReloadObjectAtIndex(int index,GridViewItemAnimation animation)
{
Debug.Assert((index >= 0 && index < numberTotalItems), "Invalid index");
UIView currentView = CellForItemAtIndex(index);
if (currentView==null)
return;
GridViewCell cell = NewItemSubViewForPosition(index);
PointF origin = layoutStrategy.OriginForItemAtPosition(index);
cell.Frame = new RectangleF(origin.X, origin.Y, itemSize.Width, itemSize.Height);
cell.Alpha = 0;
AddSubview(cell);
currentView.Tag = kTagOffset - 1;
bool shouldScroll = animation.HasFlag(GridViewItemAnimation.Scroll);
bool animate = animation.HasFlag(GridViewItemAnimation.Fade);
UIView.Animate(animate ? kDefaultAnimationDuration : 0.0,0.0,kDefaultAnimationOptions,
delegate
{
if (shouldScroll)
{
ScrollToObjectAtIndex(index,GridViewScrollPosition.None,false);
}
currentView.Alpha = 0;
cell.Alpha = 1;
},
delegate
{
currentView.RemoveFromSuperview();
});
SetSubviewsCacheAsInvalid();
}
public void InsertObjectAtIndex(int index,GridViewItemAnimation animation)
{
Debug.Assert((index >= 0 && index <= numberTotalItems), "Invalid index specified");
GridViewCell cell = null;
if (index >= firstPositionLoaded && index <= lastPositionLoaded)
{
cell = NewItemSubViewForPosition(index);
for (int i = numberTotalItems - 1; i >= index; i--)
{
UIView oldView = CellForItemAtIndex(i);
oldView.Tag = oldView.Tag + 1;
}
if (animation == GridViewItemAnimation.Fade)
{
cell.Alpha = 0;
UIView.BeginAnimations(null);
UIView.SetAnimationDelay(kDefaultAnimationDuration);
UIView.SetAnimationDuration(kDefaultAnimationDuration);
cell.Alpha = 1.0f;
UIView.CommitAnimations();
}
AddSubview(cell);
}
numberTotalItems++;
RecomputeSizeAnimated(animation!=GridViewItemAnimation.None);
bool shouldScroll = animation.HasFlag(GridViewItemAnimation.Scroll);
if (shouldScroll)
{
UIView.Animate (kDefaultAnimationDuration,0,kDefaultAnimationOptions,
delegate
{
ScrollToObjectAtIndex(index,GridViewScrollPosition.None,false);
},
delegate
{
LayoutSubviewsWithAnimation(animation);
});
}
else
{
LayoutSubviewsWithAnimation(animation);
}
SetSubviewsCacheAsInvalid();
}
public void LayoutSubviewsWithAnimation(GridViewItemAnimation animation)
{
RecomputeSizeAnimated(animation!=GridViewItemAnimation.None);
//!(animation & GMGridViewItemAnimation.None));
RelayoutItemsAnimated(animation==GridViewItemAnimation.Fade); // only supported animation for now
LoadRequiredItems();
}
public void SwapObjectAtIndex(int index1,int index2,GridViewItemAnimation animation)
{
Debug.Assert((index1 >= 0 && index1 < numberTotalItems), "Invalid index1 specified");
Debug.Assert((index2 >= 0 && index2 < numberTotalItems), "Invalid index2 specified");
GridViewCell view1 = CellForItemAtIndex(index1);
GridViewCell view2 = CellForItemAtIndex(index2);
view1.Tag = index2 + kTagOffset;
view2.Tag = index1 + kTagOffset;
PointF view1Origin = layoutStrategy.OriginForItemAtPosition(index2);
PointF view2Origin = layoutStrategy.OriginForItemAtPosition(index1);
view1.Frame = new RectangleF(view1Origin.X, view1Origin.Y, itemSize.Width, itemSize.Height);
view2.Frame = new RectangleF(view2Origin.X, view2Origin.Y, itemSize.Width, itemSize.Height);
RectangleF visibleRect = new RectangleF(ContentOffset.X,
ContentOffset.Y,
ContentSize.Width,
ContentSize.Height);
// Better performance animating ourselves instead of using animated:YES in scrollRectToVisible
bool shouldScroll = animation.HasFlag(GridViewItemAnimation.Scroll);
UIView.Animate(kDefaultAnimationDuration,0,kDefaultAnimationOptions,
delegate
{
if (shouldScroll)
{
if (!CGRectIntersectsRect(view2.Frame, visibleRect))
{
ScrollToObjectAtIndex(index1,GridViewScrollPosition.None,false);
}
else if (!CGRectIntersectsRect(view1.Frame, visibleRect))
{
ScrollToObjectAtIndex(index2,GridViewScrollPosition.None,false);
}
}
},
delegate
{
SetNeedsLayout();
});
}
