public void HitTest_Should_Not_Find_Control_Outside_Scroll_Viewport()
{
using (TestApplication())
{
Border target;
Border item1;
Border item2;
ScrollContentPresenter scroll;
Panel container;
var root = new TestRoot
{
Child = container = new Panel
{
Width = 100,
Height = 200,
Background = Brushes.Red,
Children =
{
(target = new Border()
{
Name = "b1",
Width = 100,
Height = 100,
Background = Brushes.Red,
}),
new Border()
{
Name = "b2",
Width = 100,
Height = 100,
Background = Brushes.Red,
Margin = new Thickness(0, 100, 0, 0),
Child = scroll = new ScrollContentPresenter()
{
CanHorizontallyScroll = true,
CanVerticallyScroll = true,
Content = new StackPanel()
{
Children =
{
(item1 = new Border()
{
Name = "b3",
Width = 100,
Height = 100,
Background = Brushes.Red,
}),
(item2 = new Border()
{
Name = "b4",
Width = 100,
Height = 100,
Background = Brushes.Red,
}),
}
}
}
}
}
}
};
scroll.UpdateChild();
root.Renderer = new ImmediateRenderer(root);
root.Measure(Size.Infinity);
root.Arrange(new Rect(container.DesiredSize));
root.Renderer.Paint(new Rect(root.ClientSize));
var result = root.Renderer.HitTest(new Point(50, 150), root, null).First();
Assert.Equal(item1, result);
result = root.Renderer.HitTest(new Point(50, 50), root, null).First();
Assert.Equal(target, result);
scroll.Offset = new Vector(0, 100);
// We don't have LayoutManager set up so do the layout pass manually.
scroll.Parent.InvalidateArrange();
container.InvalidateArrange();
container.Arrange(new Rect(container.DesiredSize));
root.Renderer.Paint(new Rect(root.ClientSize));
result = root.Renderer.HitTest(new Point(50, 150), root, null).First();
Assert.Equal(item2, result);
result = root.Renderer.HitTest(new Point(50, 50), root, null).First();
Assert.Equal(target, result);
}
}
private static bool TryScrollToCenterOfView(this ItemsControl itemsControl, object item)
{
// Find the container
var container = itemsControl.ItemContainerGenerator.ContainerFromItem(item) as UIElement;
if (container == null)
{
return(false);
}
// Find the ScrollContentPresenter
ScrollContentPresenter presenter = null;
for (Visual vis = container; vis != null && vis != itemsControl; vis = VisualTreeHelper.GetParent(vis) as Visual)
{
if ((presenter = vis as ScrollContentPresenter) != null)
{
break;
}
}
if (presenter == null)
{
return(false);
}
// Find the IScrollInfo
var scrollInfo =
!presenter.CanContentScroll ? presenter :
presenter.Content as IScrollInfo ??
FirstVisualChild(presenter.Content as ItemsPresenter) as IScrollInfo ??
presenter;
// Compute the center point of the container relative to the scrollInfo
Size size = container.RenderSize;
Point center = container.TransformToAncestor((Visual)scrollInfo).Transform(new Point(size.Width / 2, size.Height / 2));
center.Y += scrollInfo.VerticalOffset;
center.X += scrollInfo.HorizontalOffset;
// Adjust for logical scrolling
if (scrollInfo is StackPanel || scrollInfo is VirtualizingStackPanel)
{
double logicalCenter = itemsControl.ItemContainerGenerator.IndexFromContainer(container) + 0.5;
Orientation orientation = scrollInfo is StackPanel ? ((StackPanel)scrollInfo).Orientation : ((VirtualizingStackPanel)scrollInfo).Orientation;
if (orientation == Orientation.Horizontal)
{
center.X = logicalCenter;
}
else
{
center.Y = logicalCenter;
}
}
// Scroll the center of the container to the center of the viewport
if (scrollInfo.CanVerticallyScroll)
{
scrollInfo.SetVerticalOffset(CenteringOffset(center.Y, scrollInfo.ViewportHeight, scrollInfo.ExtentHeight));
}
if (scrollInfo.CanHorizontallyScroll)
{
scrollInfo.SetHorizontalOffset(CenteringOffset(center.X, scrollInfo.ViewportWidth, scrollInfo.ExtentWidth));
}
return(true);
}
/// <summary>
/// Updates FirstItem and LastItem based on the
/// Offset and Viewport properties.
/// </summary>
/// <param name="itemsControl">The ItemsControl that contains the data items.</param>
/// <param name="vertical">vertical </param>
internal void UpdateItem(ItemsControl itemsControl, bool vertical)
{
if (itemsControl != null)
{
int numItems = itemsControl.Items.Count;
if (numItems > 0)
{
if (VirtualizingStackPanel.GetIsVirtualizing(itemsControl))
{
// Items scrolling (value == index)
var firstIndex = (int)_offset;
int lastIndex = (int)_offset + (int)_viewport - 1;
if ((firstIndex >= 0) && (firstIndex < numItems))
{
FirstItem = itemsControl.Items[firstIndex];
}
else
{
FirstItem = null;
}
if ((lastIndex >= 0) && (lastIndex < numItems))
{
LastItem = itemsControl.Items[lastIndex];
}
else
{
LastItem = null;
}
}
else
{
// Pixel scrolling (no virtualization)
// This will do a linear search through all of the items.
// It will assume that the first item encountered that is within view is
// the first visible item and the last item encountered that is
// within view is the last visible item.
// Improvements could be made to this algorithm depending on the
// number of items in the collection and the their order relative
// to each other on-screen.
ScrollContentPresenter scp = null;
bool foundFirstItem = false;
int bestLastItemIndex = -1;
object firstVisibleItem = null;
object lastVisibleItem = null;
for (int i = 0; i < numItems; i++)
{
var child = itemsControl.ItemContainerGenerator.ContainerFromIndex(i) as UIElement;
if (child != null)
{
if (scp == null)
{
scp = FindParent <ScrollContentPresenter>(child);
if (scp == null)
{
// Not in a ScrollViewer that we understand
return;
}
}
// Transform the origin of the child element to see if it is within view
GeneralTransform t = child.TransformToAncestor(scp);
Point p =
t.Transform(foundFirstItem
? new Point(child.RenderSize.Width, child.RenderSize.Height)
: new Point());
if (!foundFirstItem && ((vertical ? p.Y : p.X) >= 0.0))
{
// Found the first visible item
firstVisibleItem = itemsControl.Items[i];
bestLastItemIndex = i;
foundFirstItem = true;
}
else if (foundFirstItem && ((vertical ? p.Y : p.X) < scp.ActualHeight))
{
// Found a candidate for the last visible item
bestLastItemIndex = i;
}
}
}
if (bestLastItemIndex >= 0)
{
lastVisibleItem = itemsControl.Items[bestLastItemIndex];
}
// Update the item properties
FirstItem = firstVisibleItem;
LastItem = lastVisibleItem;
}
}
}
}
async Task OnDrag(MouseEventArgs e)
{
var Rect = await GetRect(StartPoint, e.GetPosition(Grid));
if (IsDragging)
{
Selection.Set(Rect.X, Rect.Y, Rect.Width, Rect.Height);
Select(ItemsControl, new Rect(ScrollContentPresenter.TranslatePoint(Selection.TopLeft, ScrollContentPresenter), ScrollContentPresenter.TranslatePoint(Selection.BottomRight, ScrollContentPresenter)));
Scroll(e.GetPosition(ItemsControl));
}
}
public void GetVisualsAt_Should_Not_Find_Control_Outside_Scroll_Viewport()
{
using (UnitTestApplication.Start(new TestServices(renderInterface: new MockRenderInterface())))
{
Border target;
Border item1;
Border item2;
ScrollContentPresenter scroll;
var container = new Panel
{
Width = 100,
Height = 200,
Children = new Controls.Controls
{
(target = new Border()
{
Width = 100,
Height = 100
}),
new Border()
{
Width = 100,
Height = 100,
Margin = new Thickness(0, 100, 0, 0),
Child = scroll = new ScrollContentPresenter()
{
Content = new StackPanel()
{
Children = new Controls.Controls
{
(item1 = new Border()
{
Width = 100,
Height = 100,
}),
(item2 = new Border()
{
Width = 100,
Height = 100,
}),
}
}
}
}
}
};
scroll.UpdateChild();
container.Measure(Size.Infinity);
container.Arrange(new Rect(container.DesiredSize));
var context = new DrawingContext(Mock.Of <IDrawingContextImpl>());
context.Render(container);
var result = container.GetVisualsAt(new Point(50, 150)).First();
Assert.Equal(item1, result);
result = container.GetVisualsAt(new Point(50, 50)).First();
Assert.Equal(target, result);
scroll.Offset = new Vector(0, 100);
//we don't have setup LayoutManager so we will make it manually
scroll.Parent.InvalidateArrange();
container.InvalidateArrange();
container.Arrange(new Rect(container.DesiredSize));
context.Render(container);
result = container.GetVisualsAt(new Point(50, 150)).First();
Assert.Equal(item2, result);
result = container.GetVisualsAt(new Point(50, 50)).First();
Assert.NotEqual(item1, result);
Assert.Equal(target, result);
}
}
public static void SetLastScrollContentPresenter(DependencyObject target, ScrollContentPresenter value)
{
target.SetValue(LastScrollContentPresenterProperty, value);
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
this.scrollContentPresenter = FindParent <ScrollContentPresenter>(this);
}
internal void UpdateItem(ItemsControl itemsControl, bool vertical)
{
if (itemsControl != null)
{
int _numItems = itemsControl.Items.Count;
if (_numItems > 0)
{
/*
* if (VirtualizingStackPanel.GetIsVirtualizing(itemsControl))
* {
* // Items scrolling (value == index)
* int _firstIndex = (int) m_offset;
* int _lastIndex = (int) m_offset + (int) m_viewport - 1;
*
* if ((_firstIndex >= 0) && (_firstIndex < _numItems))
* {
* FirstItem = itemsControl.Items[_firstIndex];
* }
* else
* {
* FirstItem = null;
* }
*
* if ((_lastIndex >= 0) && (_lastIndex < _numItems))
* {
* LastItem = itemsControl.Items[_lastIndex];
* }
* else
* {
* LastItem = null;
* }
* }
* else
*/
{
// Pixel scrolling (no virtualization)
// This will do a linear search through all of the items.
// It will assume that the first item encountered that is within view is
// the first visible item and the last item encountered that is
// within view is the last visible item.
// Improvements could be made to this algorithm depending on the
// number of items in the collection and the their order relative
// to each other on-screen.
ScrollContentPresenter _scp = null;
bool _foundFirstItem = false;
int _bestLastItemIndex = -1;
object _firstVisibleItem = null;
object _lastVisibleItem = null;
for (int i = 0; i < _numItems; i++)
{
UIElement _child = itemsControl.ItemContainerGenerator.ContainerFromIndex(i) as UIElement;
if (_child != null)
{
if (_scp == null)
{
_scp = FindParent <ScrollContentPresenter>(_child);
if (_scp == null)
{
// Not in a ScrollViewer that we understand
return;
}
}
// Transform the origin of the child element to see if it is within view
GeneralTransform _t = _child.TransformToAncestor(_scp);
Point _p = _t.Transform(_foundFirstItem ? new Point(_child.RenderSize.Width, _child.RenderSize.Height) : new Point());
if (!_foundFirstItem && ((vertical ? _p.Y : _p.X) >= 0.0))
{
// Found the first visible item
_firstVisibleItem = itemsControl.Items[i];
_bestLastItemIndex = i;
_foundFirstItem = true;
}
else if (_foundFirstItem && ((vertical ? _p.Y : _p.X) < _scp.ActualHeight))
{
// Found a candidate for the last visible item
_bestLastItemIndex = i;
}
}
}
if (_bestLastItemIndex >= 0)
{
_lastVisibleItem = itemsControl.Items[_bestLastItemIndex];
}
// Update the item properties
FirstItem = _firstVisibleItem;
LastItem = _lastVisibleItem;
}
}
}
}
static void OnMouseUp(object sender, MouseButtonEventArgs e)
{
ScrollContentPresenter p = getScrollContentPresenter(sender);
if (e.ChangedButton == MouseButton.Left)
{
if (GetIsDragging(p))
{
EndDragging(p);
Mouse.Capture(null);
UITools.FindAncestor <ListView>(p).Focus();
ListViewItem curSelectedItem = getSelectedItem(p, Mouse.GetPosition(p));
if (curSelectedItem != null && curSelectedItem.Equals(_itemUnderMouse))
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
ClearSelection(lvControl);
_itemUnderMouse.IsSelected = true;
}
}
if (Point.Subtract(GetStartPosition(p), Mouse.GetPosition(p)).Length < 10.0d)
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
ClearSelection(lvControl);
}
if (_firstSelectedItem != null)
{
_firstSelectedItem.IsSelected = true;
}
_firstSelectedItem = null;
SetIsDragging(p, false);
}
else if (e.ChangedButton == MouseButton.Right)
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
ClearSelection(lvControl);
if (_itemUnderMouse != null)
{
_itemUnderMouse.IsSelected = false;
}
if (_firstSelectedItem != null)
{
_firstSelectedItem.IsSelected = false;
}
_firstSelectedItem = null;
SetIsDragging(p, false);
return;
}
else
{
}
#endregion
#region Data
#endregion
}
static void UpdateSelection(ScrollContentPresenter p, Rect selectionBounds, bool highlightOnly)
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
if (lvControl != null)
{
IChildInfo icInfo = UITools.FindVisualChild <Panel>(p) as IChildInfo;
List <object> newList = new List <object>();
List <int> newIntList = new List <int>();
if (icInfo != null)
{
for (int i = 0; i < lvControl.Items.Count; i++)
{
if (icInfo.GetChildRect(i).IntersectsWith(selectionBounds))
{
newList.Add(lvControl.Items[i]);
newIntList.Add(i);
}
}
}
else
//0.4 For GridView, only support selection if drag occur inside the first column
if (lvControl.View is GridView)
{
Point curPos = (Point)PositionCheck(GetSelectionAdorner(p), Mouse.GetPosition(p));
if ((lvControl.View as GridView).Columns.Count > 0)
{
double col0width = (lvControl.View as GridView).Columns[0].ActualWidth;
if (curPos.X < col0width || GetStartPosition(p).X < col0width)
{
if (_firstSelectedItem == null)
{
_firstSelectedItem = getSelectedItem(p, curPos);
}
ListViewItem curSelectedItem = getSelectedItem(p, curPos);
if (_firstSelectedItem != null && curSelectedItem != null)
{
int startIdx = lvControl.ItemContainerGenerator.IndexFromContainer(_firstSelectedItem);
int endIdx = lvControl.ItemContainerGenerator.IndexFromContainer(curSelectedItem);
for (int i = Math.Min(startIdx, endIdx); i <= Math.Max(startIdx, endIdx); i++)
{
if (i >= 0)
{
newList.Add(lvControl.Items[i]);
newIntList.Add(i);
}
}
}
}
}
}
if (highlightOnly)
{
SetHighlightCount(lvControl, newIntList.Count);
HighlightItems(lvControl, newIntList);
}
else
{
SetHighlightCount(lvControl, 0);
UnhighlightItems(lvControl);
UpdateSelectedItems(lvControl, newList);
}
}
}
static void BeginDragging(ScrollContentPresenter p)
{
SetStartScrollbarPosition(p, GetScrollbarPosition(p));
SetIsDragging(p, true);
}
public static void OnEnableSelectionpChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
if (s is ListView)
{
ListView control = s as ListView;
var OnScrollChange = (RoutedEventHandler) delegate(object sender, RoutedEventArgs args)
{
ItemsPresenter ip = UITools.FindVisualChild <ItemsPresenter>(sender as ListView);
ScrollContentPresenter p = UITools.FindAncestor <ScrollContentPresenter>(ip);
if (GetIsDragging(p) && Mouse.LeftButton == MouseButtonState.Pressed)
{
UpdatePosition(p, true);
}
};
var OnMouseDown = (RoutedEventHandler) delegate(object sender, RoutedEventArgs args)
{
ClearSelection(sender as ListView);
};
var OnSizeChanged = (RoutedEventHandler) delegate(object sender, RoutedEventArgs args)
{
ItemsPresenter ip = UITools.FindVisualChild <ItemsPresenter>(sender as ListView);
ScrollContentPresenter p = UITools.FindAncestor <ScrollContentPresenter>(ip);
EndDragging(p);
};
Action unloadAdorner = () =>
{
ScrollContentPresenter p = GetLastScrollContentPresenter(control);
if (p != null)
{
SelectionAdorner _adorner = GetSelectionAdorner(p);
if (AdornerLayer.GetAdornerLayer(p) != null)
{
AdornerLayer.GetAdornerLayer(p).Remove(_adorner);
}
control.MouseUp -= new MouseButtonEventHandler(OnMouseUp);
control.MouseMove -= new MouseEventHandler(OnMouseMove);
_adorner.PreviewMouseDown -= new MouseButtonEventHandler(OnPreviewMouseDown);
_adorner.MouseMove -= new MouseEventHandler(OnMouseMove);
_adorner.MouseUp -= new MouseButtonEventHandler(OnMouseUp);
control.RemoveHandler(ListView.SizeChangedEvent, OnSizeChanged);
SetSelectionAdorner(p, null);
}
};
Action attachAdorner = () =>
{
unloadAdorner();
ItemsPresenter ip = UITools.FindVisualChild <ItemsPresenter>(control);
ScrollContentPresenter p = UITools.FindAncestor <ScrollContentPresenter>(ip);
if (p != null)
{
SelectionAdorner _adorner = new SelectionAdorner(p);
SetSelectionAdorner(p, _adorner);
AdornerLayer.GetAdornerLayer(p).Add(_adorner);
control.PreviewMouseDown += new MouseButtonEventHandler(OnPreviewMouseDown);
control.MouseUp += new MouseButtonEventHandler(OnMouseUp);
control.MouseMove += new MouseEventHandler(OnMouseMove);
_adorner.PreviewMouseDown += new MouseButtonEventHandler(OnPreviewMouseDown);
_adorner.MouseMove += new MouseEventHandler(OnMouseMove);
_adorner.MouseUp += new MouseButtonEventHandler(OnMouseUp);
control.AddHandler(ListView.SizeChangedEvent, OnSizeChanged);
SetLastScrollContentPresenter(control, p);
}
};
if ((bool)e.NewValue == true)
{
if (control.IsLoaded)
{
attachAdorner();
}
else
{
control.Loaded += delegate { attachAdorner(); }
};
control.AddHandler(ScrollViewer.ScrollChangedEvent, OnScrollChange);
control.AddHandler(ListView.MouseDownEvent, OnMouseDown);
//Monitor view change, and reattach handlers.
DependencyPropertyDescriptor viewDescriptor = DependencyPropertyDescriptor.FromProperty(ListView.ViewProperty, typeof(ListView));
viewDescriptor.AddValueChanged
(control, delegate
{
control.Dispatcher.BeginInvoke(DispatcherPriority.Input, attachAdorner);
});
}
else //If EnableSelection = False
{
unloadAdorner();
control.RemoveHandler(ScrollViewer.ScrollChangedEvent, OnScrollChange);
control.RemoveHandler(ListView.MouseDownEvent, OnMouseDown);
SetSelectionAdorner(control, null);
}
}
}
private void Thumb_DragDelta(object sender, DragDeltaEventArgs e)
{
GanttChartView ganttChartView;
ScrollViewer scrollViewer;
GanttChartItem dataContext = this.Thumb.DataContext as GanttChartItem;
if (dataContext != null)
{
ganttChartView = dataContext.GanttChartView as GanttChartView;
if ((ganttChartView != null) && !dataContext.HasChildren)
{
this.horizontalChange = e.HorizontalChange;
scrollViewer = ganttChartView.ScrollViewer;
if (!this.isDuringInternalScrollOperation)
{
double x = this.originalHorizontalPosition + this.horizontalChange;
double itemHeight = ganttChartView.ItemHeight;
Point p = new Point(x, 0.0);
this.isDuringInternalScrollOperation = true;
base.Dispatcher.BeginInvoke((Action)(() =>
{
double previousHorizontalOffset = scrollViewer.HorizontalOffset;
ScrollContentPresenter visual = ganttChartView.ScrollContentPresenter;
if ((scrollViewer != null) && (visual != null))
{
try
{
p = this.TransformToVisual(visual).Transform(p);
if (p.X < itemHeight)
{
scrollViewer.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset - itemHeight);
}
if (p.X > (scrollViewer.ViewportWidth - itemHeight))
{
scrollViewer.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset + itemHeight);
}
}
catch
{
}
}
this.Dispatcher.BeginInvoke((Action)(() =>
{
this.originalHorizontalPosition -= scrollViewer.HorizontalOffset - previousHorizontalOffset;
this.isDuringInternalScrollOperation = false;
}));
}));
}
switch (this.Role)
{
case DragTaskThumbRole.UpdateFinish:
if (!dataContext.IsMilestone)
{
double num3 = ganttChartView.GetPosition(dataContext.Finish) + e.HorizontalChange;
dataContext.Finish = ganttChartView.GetPreviousVisibleWorkingTime(ganttChartView.GetUpdateScaleTime(ganttChartView.GetDateTime(num3)));
return;
}
return;
case DragTaskThumbRole.UpdateCompletedFinish:
if (!dataContext.IsMilestone)
{
double num4 = ganttChartView.GetPosition(dataContext.CompletedFinish) + e.HorizontalChange;
dataContext.CompletedFinish = ganttChartView.GetPreviousVisibleWorkingTime(ganttChartView.GetUpdateScaleTime(ganttChartView.GetDateTime(num4)));
return;
}
return;
}
double position = ganttChartView.GetPosition(dataContext.Start) + e.HorizontalChange;
TimeSpan effort = dataContext.Effort;
TimeSpan completedEffort = dataContext.CompletedEffort;
dataContext.Start = ganttChartView.GetNextVisibleWorkingTime(ganttChartView.GetUpdateScaleTime(ganttChartView.GetDateTime(position)));
if (!dataContext.IsMilestone)
{
dataContext.Effort = effort;
dataContext.CompletedEffort = completedEffort;
}
}
}
}
