protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
ListViewItem listViewItem = element as ListViewItem;
listViewItem.SizeChanged -= ListViewItem_SizeChanged;
if (listViewItem.Tag == null)
{
defaultListViewItemMargin = listViewItem.Margin;
}
if (groupCollection != null)
{
var index = IndexFromContainer(element);
var group = groupCollection.GroupHeaders.FirstOrDefault(x => x.FirstIndex == index || x.LastIndex == index);
if (group != null)
{
if (groupheaders.ContainsKey(group) && groupheaders[group] != listViewItem)
{
groupheaders[group].Margin = defaultListViewItemMargin;
}
groupheaders[group] = listViewItem;
if (!groupDic.ContainsKey(group))
{
ContentControl groupheader = CreateGroupHeader(group);
ContentControl tempGroupheader = CreateGroupHeader(group);
ExpressionAnimationItem expressionAnimationItem = new ExpressionAnimationItem();
expressionAnimationItem.VisualElement = groupheader;
expressionAnimationItem.TempElement = tempGroupheader;
groupDic[group] = expressionAnimationItem;
var temp = new Dictionary <IGroupHeader, ExpressionAnimationItem>();
foreach (var keyValue in groupDic.OrderBy(x => x.Key.FirstIndex))
{
temp[keyValue.Key] = keyValue.Value;
}
groupDic = temp;
if (groupHeadersCanvas != null)
{
groupHeadersCanvas.Children.Add(groupheader);
groupHeadersCanvas.Children.Add(tempGroupheader);
groupheader.Measure(new Windows.Foundation.Size(this.ActualWidth, this.ActualHeight));
group.Height = groupheader.DesiredSize.Height;
groupheader.Height = tempGroupheader.Height = group.Height;
groupheader.Width = tempGroupheader.Width = this.ActualWidth;
if (group.FirstIndex == index)
{
listViewItem.Tag = listViewItem.Margin;
listViewItem.Margin = GetItemMarginBaseOnDeafult(groupheader.DesiredSize.Height);
listViewItem.SizeChanged += ListViewItem_SizeChanged;
}
groupheader.Visibility = Visibility.Collapsed;
tempGroupheader.Visibility = Visibility.Collapsed;
UpdateGroupHeaders();
}
}
else
{
if (group.FirstIndex == index)
{
listViewItem.Tag = listViewItem.Margin;
listViewItem.Margin = GetItemMarginBaseOnDeafult(group.Height);
listViewItem.SizeChanged += ListViewItem_SizeChanged;
}
else
{
listViewItem.Margin = defaultListViewItemMargin;
}
}
}
else
{
listViewItem.Margin = defaultListViewItemMargin;
}
}
else
{
listViewItem.Margin = defaultListViewItemMargin;
}
}
private void HandleItemsInItemsPanel(bool isIntermediate, KeyValuePair <IGroupHeader, ExpressionAnimationItem> item, ListViewItem listViewItem)
{
GeneralTransform gt = listViewItem.TransformToVisual(this);
var rect = gt.TransformBounds(new Rect(0, 0, listViewItem.ActualWidth, listViewItem.ActualHeight));
groupHeaderDelta = item.Key.Height;
//add delta,so that it does not look like suddenly
var itemMargin = new Thickness(0, rect.Top - groupHeaderDelta - defaultListViewItemMargin.Top, 0, 0);
RectangleGeometry itemClip = null;
Visibility itemVisibility = Visibility.Collapsed;
if (itemMargin.Top < 0)
{
var clipHeight = groupHeaderDelta + itemMargin.Top;
//moving header has part in viewport
if (clipHeight > 0)
{
itemVisibility = Visibility.Visible;
itemClip = new RectangleGeometry()
{
Rect = new Rect(0, -itemMargin.Top, this.ActualWidth, clipHeight)
};
}
//moving header not in viewport
else
{
itemVisibility = Visibility.Collapsed;
itemClip = null;
}
}
else if (itemMargin.Top + groupHeaderDelta > this.ActualHeight)
{
var clipHeight = groupHeaderDelta - (groupHeaderDelta + itemMargin.Top - this.ActualHeight);
//moving header has part in viewport
if (clipHeight > 0)
{
itemVisibility = Visibility.Visible;
itemClip = new RectangleGeometry()
{
Rect = new Rect(0, 0, this.ActualWidth, clipHeight)
};
}
//moving header not in viewport
else
{
itemVisibility = Visibility.Collapsed;
itemClip = null;
}
}
//moving header all in viewport
else
{
itemVisibility = Visibility.Visible;
itemClip = null;
}
if (currentTopGroupHeader != null)
{
var delta = currentTopGroupHeader.ActualHeight - (itemMargin.Top);
if (delta > 0)
{
currentTopGroupHeader.Margin = new Thickness(0, -delta, 0, 0);
currentTopGroupHeader.Clip = new RectangleGeometry()
{
Rect = new Rect(0, delta, currentTopGroupHeader.ActualWidth, currentTopGroupHeader.ActualHeight)
};
if (delta >= groupHeaderDelta)
{
currentTopGroupHeader.Visibility = Visibility.Visible;
currentTopGroupHeader.Margin = new Thickness(0);
currentTopGroupHeader.Clip = null;
currentTopGroupHeader.DataContext = item.Key;
}
}
}
bool isInViewport = false;
if (itemMargin.Top > 0)
{
var groupheaderRect = new Rect(0, itemMargin.Top, this.ActualWidth, groupHeaderDelta);
isInViewport = (groupheaderRect.Top < this.ActualHeight && groupheaderRect.Bottom > 0);
}
if (!isInViewport)
{
ClearTempElement(item);
}
if (!item.Value.IsActive)
{
// isIntermediate is false or groupheaderRect has into view port and view not changing
if (!isIntermediate || (isInViewport && !isViewChanging))
{
ExpressionAnimationItem expressionItem = item.Value;
expressionItem.StopAnimation();
item.Value.TempElement.Margin = new Thickness(0);
item.Value.TempElement.Clip = null;
item.Value.TempElement.Visibility = Visibility.Collapsed;
item.Value.VisualElement.Margin = itemMargin;
item.Value.VisualElement.Clip = itemClip;
item.Value.VisualElement.Visibility = itemVisibility;
if (expressionItem.ScrollViewer == null)
{
expressionItem.ScrollViewer = scrollViewer;
}
expressionItem.StartAnimation(true);
}
//temp use
else if (isInViewport)
{
item.Value.TempElement.Margin = itemMargin;
item.Value.TempElement.Clip = itemClip;
item.Value.TempElement.Visibility = itemVisibility;
}
}
//use active animation
else
{
if (item.Value.VisualElement.Clip != itemClip || item.Value.VisualElement.Visibility != itemVisibility)
{
ExpressionAnimationItem expressionItem = item.Value;
expressionItem.StopAnimation();
if (!isIntermediate)
{
item.Value.VisualElement.Margin = itemMargin;
}
//item.Value.VisualElement.Margin = itemMargin;
expressionItem.VisualElement.Clip = itemClip;
expressionItem.VisualElement.Visibility = itemVisibility;
if (expressionItem.ScrollViewer == null)
{
expressionItem.ScrollViewer = scrollViewer;
}
expressionItem.StartAnimation(!isIntermediate);
}
}
}
internal void UpdateGroupHeaders(bool isIntermediate = false)
{
var firstVisibleItemIndex = this.GetFirstVisibleIndex();
if (firstVisibleItemIndex < 0)
{
return;
}
foreach (var item in groupDic)
{
//top header
if (item.Key.FirstIndex <= firstVisibleItemIndex && (firstVisibleItemIndex <= item.Key.LastIndex || item.Key.LastIndex == -1))
{
currentTopGroupHeader.Visibility = Visibility.Visible;
currentTopGroupHeader.Margin = new Thickness(0);
currentTopGroupHeader.Clip = null;
currentTopGroupHeader.DataContext = item.Key;
item.Value.TempElement.Visibility = Visibility.Collapsed;
item.Value.TempElement.Margin = new Thickness(0);
item.Value.TempElement.Clip = null;
item.Value.StopAnimation();
item.Value.VisualElement.Visibility = Visibility.Collapsed;
}
else
{
ListViewItem listViewItem = ContainerFromIndex(item.Key.FirstIndex) as ListViewItem;
if (listViewItem == null && item.Key.LastIndex != -1)
{
listViewItem = ContainerFromIndex(item.Key.LastIndex) as ListViewItem;
}
if (listViewItem != null)
{
//unloaded
if (listViewItem.ActualHeight == 0 || listViewItem.ActualWidth == 0)
{
listViewItem.Loaded += ListViewItem_Loaded;
}
else
{
GeneralTransform gt = listViewItem.TransformToVisual(this);
var rect = gt.TransformBounds(new Rect(0, 0, listViewItem.ActualWidth, listViewItem.ActualHeight));
groupHeaderDelta = item.Key.Height;
//add delta,so that it does not look like suddenly
if (rect.Bottom + groupHeaderDelta < 0 || rect.Top > this.ActualHeight + groupHeaderDelta)
{
item.Value.TempElement.Visibility = Visibility.Collapsed;
item.Value.TempElement.Margin = new Thickness(0);
item.Value.TempElement.Clip = null;
item.Value.StopAnimation();
item.Value.VisualElement.Visibility = Visibility.Collapsed;
}
//in view port
else
{
var itemMargin = new Thickness(0, rect.Top - groupHeaderDelta - defaultListViewItemMargin.Top, 0, 0);
RectangleGeometry itemClip = null;
Visibility itemVisibility = Visibility.Collapsed;
if (itemMargin.Top < 0)
{
var clipHeight = groupHeaderDelta + itemMargin.Top;
//moving header has part in viewport
if (clipHeight > 0)
{
itemVisibility = Visibility.Visible;
itemClip = new RectangleGeometry()
{
Rect = new Rect(0, -itemMargin.Top, this.ActualWidth, clipHeight)
};
}
//moving header not in viewport
else
{
itemVisibility = Visibility.Collapsed;
itemClip = null;
}
}
else if (itemMargin.Top + groupHeaderDelta > this.ActualHeight)
{
var clipHeight = groupHeaderDelta - (groupHeaderDelta + itemMargin.Top - this.ActualHeight);
//moving header has part in viewport
if (clipHeight > 0)
{
itemVisibility = Visibility.Visible;
itemClip = new RectangleGeometry()
{
Rect = new Rect(0, 0, this.ActualWidth, clipHeight)
};
}
//moving header not in viewport
else
{
itemVisibility = Visibility.Collapsed;
itemClip = null;
}
}
//moving header all in viewport
else
{
itemVisibility = Visibility.Visible;
itemClip = null;
}
if (currentTopGroupHeader != null)
{
var delta = currentTopGroupHeader.ActualHeight - (itemMargin.Top);
if (delta > 0)
{
currentTopGroupHeader.Margin = new Thickness(0, -delta, 0, 0);
currentTopGroupHeader.Clip = new RectangleGeometry()
{
Rect = new Rect(0, delta, currentTopGroupHeader.ActualWidth, currentTopGroupHeader.ActualHeight)
};
}
}
//all in viewport
if (itemVisibility == Visibility.Visible)
{
if (!item.Value.IsActive)
{
//when isIntermediate is false and clip is null, so that make sure animation is accurate
if (item.Value.TempElement.Clip == null && itemClip == null && !isIntermediate)
{
ExpressionAnimationItem expressionItem = item.Value;
expressionItem.StopAnimation();
item.Value.TempElement.Visibility = Visibility.Collapsed;
item.Value.TempElement.Margin = new Thickness(0);
item.Value.TempElement.Clip = null;
item.Value.VisualElement.Margin = itemMargin;
item.Value.VisualElement.Clip = itemClip;
item.Value.VisualElement.Visibility = itemVisibility;
if (expressionItem.ScrollViewer == null)
{
expressionItem.ScrollViewer = scrollViewer;
}
expressionItem.StartAnimation(true);
}
//use tempElemnt for Clip and isIntermediate is true
else
{
item.Value.TempElement.Margin = itemMargin;
item.Value.TempElement.Clip = itemClip;
item.Value.TempElement.Visibility = itemVisibility;
}
}
//use active animation
else
{
}
}
else
{
item.Value.TempElement.Margin = itemMargin;
item.Value.TempElement.Clip = itemClip;
item.Value.TempElement.Visibility = itemVisibility;
item.Value.StopAnimation();
item.Value.VisualElement.Visibility = Visibility.Collapsed;
}
}
}
}
else
{
if (item.Key != currentTopGroupHeader.DataContext)
{
item.Value.TempElement.Visibility = Visibility.Collapsed;
item.Value.TempElement.Margin = new Thickness(0);
item.Value.TempElement.Clip = null;
item.Value.StopAnimation();
item.Value.VisualElement.Visibility = Visibility.Collapsed;
}
}
}
}
}
internal void ForceUpdateGroupHeader(ListViewItem listViewItem, KeyValuePair <IGroupHeader, ExpressionAnimationItem> item)
{
GeneralTransform gt = listViewItem.TransformToVisual(this);
var rect = gt.TransformBounds(new Rect(0, 0, listViewItem.ActualWidth, listViewItem.ActualHeight));
groupHeaderDelta = item.Key.Height;
//add delta,so that it does not look like suddenly
var itemMargin = new Thickness(0, rect.Top - groupHeaderDelta - defaultListViewItemMargin.Top, 0, 0);
RectangleGeometry itemClip = null;
Visibility itemVisibility = Visibility.Collapsed;
if (itemMargin.Top < 0)
{
var clipHeight = groupHeaderDelta + itemMargin.Top;
//moving header has part in viewport
if (clipHeight > 0)
{
itemVisibility = Visibility.Visible;
itemClip = new RectangleGeometry()
{
Rect = new Rect(0, -itemMargin.Top, this.ActualWidth, clipHeight)
};
}
//moving header not in viewport
else
{
itemVisibility = Visibility.Collapsed;
itemClip = null;
}
}
else if (itemMargin.Top + groupHeaderDelta > this.ActualHeight)
{
var clipHeight = groupHeaderDelta - (groupHeaderDelta + itemMargin.Top - this.ActualHeight);
//moving header has part in viewport
if (clipHeight > 0)
{
itemVisibility = Visibility.Visible;
itemClip = new RectangleGeometry()
{
Rect = new Rect(0, 0, this.ActualWidth, clipHeight)
};
}
//moving header not in viewport
else
{
itemVisibility = Visibility.Collapsed;
itemClip = null;
}
}
//moving header all in viewport
else
{
itemVisibility = Visibility.Visible;
itemClip = null;
}
if (currentTopGroupHeader != null)
{
var delta = currentTopGroupHeader.ActualHeight - (itemMargin.Top);
if (delta > 0)
{
currentTopGroupHeader.Margin = new Thickness(0, -delta, 0, 0);
currentTopGroupHeader.Clip = new RectangleGeometry()
{
Rect = new Rect(0, delta, currentTopGroupHeader.ActualWidth, currentTopGroupHeader.ActualHeight)
};
if (delta >= groupHeaderDelta)
{
currentTopGroupHeader.Visibility = Visibility.Visible;
currentTopGroupHeader.Margin = new Thickness(0);
currentTopGroupHeader.Clip = null;
currentTopGroupHeader.DataContext = item.Key;
}
}
}
ExpressionAnimationItem expressionItem = item.Value;
expressionItem.StopAnimation();
item.Value.VisualElement.Margin = itemMargin;
expressionItem.VisualElement.Clip = itemClip;
expressionItem.VisualElement.Visibility = itemVisibility;
if (expressionItem.ScrollViewer == null)
{
expressionItem.ScrollViewer = scrollViewer;
}
expressionItem.StartAnimation(true);
}
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
ListViewItem listViewItem = element as ListViewItem;
if (listViewItem.Tag == null)
{
defaultListViewItemMargin = listViewItem.Margin;
}
if (groupCollection != null && listViewItem != null)
{
var index = IndexFromContainer(element);
var group = groupCollection.GroupHeaders.FirstOrDefault(x => x.FirstIndex == index || x.LastIndex == index);
if (group != null)
{
if (!groupDic.ContainsKey(group))
{
ContentControl tempGroupheader = CreateGroupHeader(group);
ContentControl groupheader = CreateGroupHeader(group);
ExpressionAnimationItem expressionAnimationItem = new ExpressionAnimationItem();
expressionAnimationItem.TempElement = tempGroupheader;
expressionAnimationItem.VisualElement = groupheader;
groupDic[group] = expressionAnimationItem;
var temp = new Dictionary<IGroupHeader, ExpressionAnimationItem>();
foreach (var keyValue in groupDic.OrderBy(x => x.Key.FirstIndex))
{
temp[keyValue.Key] = keyValue.Value;
}
groupDic = temp;
if (groupHeadersGrid != null)
{
groupHeadersGrid.Children.Add(groupheader);
groupHeadersGrid.Children.Add(tempGroupheader);
groupheader.Measure(new Windows.Foundation.Size(this.ActualWidth, this.ActualHeight));
group.Height = groupheader.DesiredSize.Height;
if (group.FirstIndex == index)
{
listViewItem.Tag = listViewItem.Margin;
listViewItem.Margin = GetItemMarginBaseOnDeafult(groupheader.DesiredSize.Height);
}
groupheader.Visibility = Visibility.Collapsed;
tempGroupheader.Visibility = Visibility.Collapsed;
UpdateGroupHeaders();
}
}
else
{
if (group.FirstIndex == index)
{
listViewItem.Tag = listViewItem.Margin;
listViewItem.Margin = GetItemMarginBaseOnDeafult(group.Height);
}
else
{
listViewItem.Margin = defaultListViewItemMargin;
}
}
}
else
{
listViewItem.Margin = defaultListViewItemMargin;
}
}
else
{
listViewItem.Margin = defaultListViewItemMargin;
}
}