|
public static GetControlWorkArea ( |
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| control | Control | |
| return | ||
/// <inheritdoc />
protected override void OnDropDownOpened(EventArgs e)
{
base.OnDropDownOpened(e);
Mouse.Capture(this, CaptureMode.SubTree);
if (this.SelectedItem is not null)
{
Keyboard.Focus(this.ItemContainerGenerator.ContainerOrContainerContentFromItem <IInputElement>(this.SelectedItem));
}
this.focusedElement = Keyboard.FocusedElement;
if (this.focusedElement is not null)
{
this.focusedElement.LostKeyboardFocus += this.OnFocusedElementLostKeyboardFocus;
}
this.canSizeY = true;
if (this.scrollViewer is not null)
{
this.scrollViewer.Width = double.NaN;
this.scrollViewer.Height = double.NaN;
}
var popupChild = this.DropDownPopup?.Child as FrameworkElement;
var initialHeight = Math.Min(RibbonControl.GetControlWorkArea(this).Height * 2 / 3, this.MaxDropDownHeight);
if (double.IsNaN(this.DropDownHeight) == false)
{
initialHeight = Math.Min(this.DropDownHeight, this.MaxDropDownHeight);
}
if (this.scrollViewer?.DesiredSize.Height > initialHeight)
{
this.scrollViewer.Height = initialHeight;
}
popupChild?.UpdateLayout();
}
/// <summary>
/// Reports when a combo box's popup opens.
/// </summary>
/// <param name="e">The event data for the <see cref="E:System.Windows.Controls.ComboBox.DropDownOpened" /> event.</param>
protected override void OnDropDownOpened(EventArgs e)
{
base.OnDropDownOpened(e);
Mouse.Capture(this, CaptureMode.SubTree);
if (this.SelectedItem != null)
{
Keyboard.Focus(this.ItemContainerGenerator.ContainerFromItem(this.SelectedItem) as IInputElement);
}
this.focusedElement = Keyboard.FocusedElement;
if (this.focusedElement != null)
{
this.focusedElement.LostKeyboardFocus += this.OnFocusedElementLostKeyboardFocus;
}
this.canSizeY = true;
this.galleryPanel.Width = double.NaN;
this.scrollViewer.Height = double.NaN;
var popupChild = this.DropDownPopup.Child as FrameworkElement;
var heightDelta = popupChild.DesiredSize.Height - this.scrollViewer.DesiredSize.Height;
var initialHeight = Math.Min(RibbonControl.GetControlWorkArea(this).Height * 2 / 3, this.MaxDropDownHeight);
if (double.IsNaN(this.DropDownHeight) == false)
{
initialHeight = Math.Min(this.DropDownHeight, this.MaxDropDownHeight);
}
if (this.scrollViewer.DesiredSize.Height > initialHeight)
{
this.scrollViewer.Height = initialHeight;
}
else
{
initialHeight = this.scrollViewer.DesiredSize.Height;
}
var monitor = RibbonControl.GetControlMonitor(this);
var delta = monitor.Bottom - this.PointToScreen(new Point()).Y - this.ActualHeight - initialHeight - heightDelta;
if (delta >= 0)
{
this.ShowPopupOnTop = false;
}
else
{
var deltaTop = this.PointToScreen(new Point()).Y - initialHeight - heightDelta - monitor.Top;
if (deltaTop > delta)
{
this.ShowPopupOnTop = true;
}
else
{
this.ShowPopupOnTop = false;
}
if (deltaTop < 0)
{
delta = Math.Max(Math.Abs(delta), Math.Abs(deltaTop));
if (delta > this.galleryPanel.GetItemSize().Height)
{
this.scrollViewer.Height = delta;
}
else
{
this.canSizeY = false;
this.scrollViewer.Height = this.galleryPanel.GetItemSize().Height;
}
}
}
popupChild.UpdateLayout();
}
/// <summary>
/// Reports when a combo box's popup opens.
/// </summary>
/// <param name="e">The event data for the <see cref="E:System.Windows.Controls.ComboBox.DropDownOpened"/> event.</param>
protected override void OnDropDownOpened(EventArgs e)
{
base.OnDropDownOpened(e);
Mouse.Capture(this, CaptureMode.SubTree);
if (SelectedItem != null)
{
Keyboard.Focus(ItemContainerGenerator.ContainerFromItem(SelectedItem) as IInputElement);
}
focusedElement = Keyboard.FocusedElement;
focusedElement.LostKeyboardFocus += OnFocusedElementLostKeyboardFocus;
canSizeX = true;
canSizeY = true;
galleryPanel.Width = double.NaN;
scrollViewer.Height = double.NaN;
FrameworkElement popupChild = popup.Child as FrameworkElement;
scrollViewer.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
popupChild.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
popup.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
double heightDelta = popupChild.DesiredSize.Height - scrollViewer.DesiredSize.Height;
double initialHeight = Math.Min(RibbonControl.GetControlWorkArea(this).Height * 2 / 3, MaxDropDownHeight);
if (!double.IsNaN(DropDownHeight))
{
initialHeight = Math.Min(DropDownHeight, MaxDropDownHeight);
}
if (scrollViewer.DesiredSize.Height > initialHeight)
{
scrollViewer.Height = initialHeight;
}
else
{
initialHeight = scrollViewer.DesiredSize.Height;
}
Rect monitor = RibbonControl.GetControlMonitor(this);
double delta = monitor.Bottom - this.PointToScreen(new Point()).Y - ActualHeight - initialHeight - heightDelta;
if (delta >= 0)
{
ShowPopupOnTop = false;
}
else
{
double deltaTop = this.PointToScreen(new Point()).Y - initialHeight - heightDelta - monitor.Top;
if (deltaTop > delta)
{
ShowPopupOnTop = true;
}
else
{
ShowPopupOnTop = false;
}
if (deltaTop < 0)
{
delta = Math.Max(Math.Abs(delta), Math.Abs(deltaTop));
if (delta > galleryPanel.GetItemSize().Height)
{
scrollViewer.Height = delta;
}
else
{
canSizeY = false;
scrollViewer.Height = galleryPanel.GetItemSize().Height;
}
}
}
popupChild.UpdateLayout();
}