private static ItemsPresenter CreateTarget(
Orientation orientation = Orientation.Vertical,
bool useContainers = true,
int itemCount = 20,
bool useAvaloniaList = false)
{
ItemsPresenter result;
var itemsSource = Enumerable.Range(0, itemCount).Select(x => $"Item {x}");
var items = useAvaloniaList ?
(IEnumerable) new AvaloniaList <string>(itemsSource) :
(IEnumerable) new ObservableCollection <string>(itemsSource);
var scroller = new ScrollContentPresenter
{
Content = result = new TestItemsPresenter(useContainers)
{
Items = items,
ItemsPanel = VirtualizingPanelTemplate(orientation),
ItemTemplate = ItemTemplate(),
VirtualizationMode = ItemVirtualizationMode.Simple,
}
};
scroller.UpdateChild();
return(result);
}
private static ItemsPresenter CreateTarget(
ItemVirtualizationMode mode = ItemVirtualizationMode.Simple,
Orientation orientation = Orientation.Vertical,
bool useContainers = true,
int itemCount = 20)
{
ItemsPresenter result;
var items = Enumerable.Range(0, itemCount).Select(x => $"Item {x}").ToList();
var scroller = new TestScroller
{
CanHorizontallyScroll = false,
CanVerticallyScroll = true,
Content = result = new TestItemsPresenter(useContainers)
{
Items = items,
ItemsPanel = VirtualizingPanelTemplate(orientation),
ItemTemplate = ItemTemplate(),
VirtualizationMode = mode,
}
};
scroller.UpdateChild();
return(result);
}
public void Should_Not_Create_Items_Before_Added_To_Visual_Tree()
{
var items = Enumerable.Range(0, 10).Select(x => $"Item {x}").ToList();
var target = new TestItemsPresenter(true)
{
Items = items,
ItemsPanel = VirtualizingPanelTemplate(Orientation.Vertical),
ItemTemplate = ItemTemplate(),
VirtualizationMode = ItemVirtualizationMode.Simple,
};
var scroller = new ScrollContentPresenter
{
Content = target,
};
scroller.UpdateChild();
target.ApplyTemplate();
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
Assert.Empty(target.Panel.Children);
var root = new TestRoot
{
Child = scroller,
};
target.InvalidateMeasure();
target.Panel.InvalidateMeasure();
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
Assert.Equal(10, target.Panel.Children.Count);
}
public void Should_Not_Create_Items_Before_Added_To_Visual_Tree()
{
var items = Enumerable.Range(0, 10).Select(x => $"Item {x}").ToList();
var target = new TestItemsPresenter(true)
{
Items = items,
ItemsPanel = VirtualizingPanelTemplate(Orientation.Vertical),
ItemTemplate = ItemTemplate(),
VirtualizationMode = ItemVirtualizationMode.Simple,
};
var scroller = new ScrollContentPresenter
{
Content = target,
};
scroller.UpdateChild();
target.ApplyTemplate();
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
Assert.Empty(target.Panel.Children);
var root = new TestRoot
{
Child = scroller,
};
target.InvalidateMeasure();
target.Panel.InvalidateMeasure();
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
Assert.Equal(10, target.Panel.Children.Count);
}
private static ItemsPresenter CreateTarget(
Orientation orientation = Orientation.Vertical,
bool useContainers = true,
int itemCount = 20,
bool useAvaloniaList = false)
{
ItemsPresenter result;
var itemsSource = Enumerable.Range(0, itemCount).Select(x => $"Item {x}");
var items = useAvaloniaList ?
(IEnumerable)new AvaloniaList<string>(itemsSource) :
(IEnumerable)new ObservableCollection<string>(itemsSource);
var scroller = new TestScroller
{
Content = result = new TestItemsPresenter(useContainers)
{
Items = items,
ItemsPanel = VirtualizingPanelTemplate(orientation),
ItemTemplate = ItemTemplate(),
VirtualizationMode = ItemVirtualizationMode.Simple,
}
};
scroller.UpdateChild();
return result;
}
private static ItemsPresenter CreateTarget(
ItemVirtualizationMode mode = ItemVirtualizationMode.Simple,
Orientation orientation = Orientation.Vertical,
bool useContainers = true,
int itemCount = 20)
{
ItemsPresenter result;
var items = Enumerable.Range(0, itemCount).Select(x => $"Item {x}").ToList();
var scroller = new TestScroller
{
Content = result = new TestItemsPresenter(useContainers)
{
Items = items,
ItemsPanel = VirtualizingPanelTemplate(orientation),
ItemTemplate = ItemTemplate(),
VirtualizationMode = mode,
}
};
scroller.UpdateChild();
return result;
}
