private void RunElementTrackingTestRoutine(Action <
ObservableCollection <ObservableCollection <string> > /* data */,
TestScrollingSurface[] /* scrollers */,
ItemsRepeater /* rootRepeater */> testRoutine)
{
// Base setup for our element tracking tests.
// We have 4 fake scrollers in series, initially in a non scrollable configuration.
// Under them we have a group repeater tree (2 groups with 3 items each).
// The group UI is a StackPanel with a TextBlock "header" and an inner ItemsRepeater.
RunOnUIThread.Execute(() =>
{
int groupCount = 2;
int itemsPerGroup = 3;
var data = new ObservableCollection <ObservableCollection <string> >(
Enumerable.Range(0, groupCount).Select(i => new ObservableCollection <string>(
Enumerable.Range(0, itemsPerGroup).Select(j => string.Format("Item #{0}.{1}", i, j)))));
var itemElements = Enumerable.Range(0, groupCount).Select(i =>
Enumerable.Range(0, itemsPerGroup).Select(j => new Border {
Tag = data[i][j], Width = 50, Height = 50, Background = new SolidColorBrush(Colors.Red)
}).ToList()).ToArray();
var headerElements = Enumerable.Range(0, groupCount).Select(i => new TextBlock {
Text = "Header #" + i
}).ToList();
var groupRepeaters = Enumerable.Range(0, groupCount).Select(i => new ItemsRepeater
{
Tag = "ItemsRepeater #" + i,
ItemsSource = data[i],
ItemTemplate = MockElementFactory.CreateElementFactory(itemElements[i]),
Layout = new TestGridLayout {
Orientation = Orientation.Horizontal, MinItemWidth = 50, MinItemHeight = 50, MinRowSpacing = 10, MinColumnSpacing = 10
}
}).ToList();
var groupElement = Enumerable.Range(0, groupCount).Select(i =>
{
var panel = new StackPanel();
panel.Tag = "Group #" + i;
panel.Children.Add(headerElements[i]);
panel.Children.Add(groupRepeaters[i]);
return(panel);
}).ToList();
var rootRepeater = new ItemsRepeater
{
Tag = "Root ItemsRepeater",
ItemsSource = data,
ItemTemplate = MockElementFactory.CreateElementFactory(groupElement),
Layout = new TestStackLayout {
Orientation = Orientation.Vertical
}
};
var scrollers = new TestScrollingSurface[4];
for (int i = 0; i < scrollers.Length; ++i)
{
scrollers[i] = new TestScrollingSurface()
{
Tag = "S" + i,
Content = i > 0 ? (UIElement)scrollers[i - 1] : rootRepeater
};
}
var resetScrollers = (Action)(() =>
{
foreach (var scroller in scrollers)
{
scroller.IsHorizontallyScrollable = false;
scroller.IsVerticallyScrollable = false;
scroller.RegisterAnchorCandidateFunc = null;
scroller.UnregisterAnchorCandidateFunc = null;
scroller.GetRelativeViewportFunc = null;
}
});
var outerScroller = scrollers.Last();
outerScroller.Width = 200.0;
outerScroller.Height = 2000.0;
Content = outerScroller;
Content.UpdateLayout();
testRoutine(data, scrollers, rootRepeater);
});
}
