/// <summary>
/// When overridden in a derived class, is invoked whenever application code or internal processes call <see cref="M:System.Windows.FrameworkElement.ApplyTemplate"/>.
/// </summary>
public override void OnApplyTemplate()
{
this.UnSubscribeEvents();
this.isFirstTime = true;
if (this.DropDownPopup != null)
{
this.DropDownPopup.KeyUp -= this.OnDropDownPopupKeyUp;
}
this.DropDownPopup = this.Template.FindName("PART_Popup", this) as Popup;
if (this.DropDownPopup != null)
{
KeyboardNavigation.SetDirectionalNavigation(this.DropDownPopup, KeyboardNavigationMode.Cycle);
KeyboardNavigation.SetTabNavigation(this.DropDownPopup, KeyboardNavigationMode.Continue);
this.DropDownPopup.KeyUp += this.OnDropDownPopupKeyUp;
}
this.resizeVerticalThumb = this.Template.FindName("PART_ResizeVerticalThumb", this) as Thumb;
this.resizeBothThumb = this.Template.FindName("PART_ResizeBothThumb", this) as Thumb;
this.buttonBorder = this.Template.FindName("PART_ButtonBorder", this) as Border;
this.menuPanel = this.Template.FindName("PART_MenuPanel", this) as MenuPanel;
this.scrollViewer = this.Template.FindName("PART_ScrollViewer", this) as ScrollViewer;
base.OnApplyTemplate();
this.SubscribeEvents();
}
/// <summary>
/// When overridden in a derived class, positions child elements and
/// determines a size for a System.Windows.FrameworkElement derived class.
/// </summary>
/// <param name="finalSize">The final area within the parent that this element
/// should use to arrange itself and its children.</param>
/// <returns>The actual size used.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
double totalHeight = 0;
List <UIElement> nonItemsElements = new List <UIElement>();
foreach (var child in InternalChildren)
{
MenuItem item = child as MenuItem;
if ((item != null) && (item.Visibility != Visibility.Collapsed))
{
totalHeight += item.DesiredSize.Height;
}
else
{
Separator separator = child as Separator;
if ((separator != null) && (separator.Visibility != Visibility.Collapsed))
{
totalHeight += separator.DesiredSize.Height;
}
else
{
MenuPanel panel = child as MenuPanel;
if (panel != null)
{
totalHeight += panel.DesiredSize.Height;
}
else
{
nonItemsElements.Add(child as UIElement);
}
}
}
}
double y = 0;
double deltaHeight = Math.Max(0, (finalSize.Height - totalHeight) / nonItemsElements.Count);
foreach (var child in InternalChildren)
{
UIElement element = (child as UIElement);
if ((element != null) && (element.Visibility != Visibility.Collapsed))
{
double height = deltaHeight;
if ((element is MenuItem) || (element is Separator) || (element is MenuPanel))
{
height = element.DesiredSize.Height;
}
element.Arrange(new Rect(0, y, finalSize.Width, height));
y += height;
}
}
return(finalSize);
}
/// <summary>
/// Called when the template's tree is generated.
/// </summary>
public override void OnApplyTemplate()
{
if (popup != null)
{
popup.Opened -= OnDropDownOpened;
popup.Closed -= OnDropDownClosed;
}
popup = GetTemplateChild("PART_Popup") as Popup;
if (popup != null)
{
popup.Opened += OnDropDownOpened;
popup.Closed += OnDropDownClosed;
KeyboardNavigation.SetControlTabNavigation(popup, KeyboardNavigationMode.Cycle);
KeyboardNavigation.SetDirectionalNavigation(popup, KeyboardNavigationMode.Cycle);
KeyboardNavigation.SetTabNavigation(popup, KeyboardNavigationMode.Cycle);
}
if (resizeVerticalThumb != null)
{
resizeVerticalThumb.DragDelta -= OnResizeVerticalDelta;
}
resizeVerticalThumb = GetTemplateChild("PART_ResizeVerticalThumb") as Thumb;
if (resizeVerticalThumb != null)
{
resizeVerticalThumb.DragDelta += OnResizeVerticalDelta;
}
if (resizeBothThumb != null)
{
resizeBothThumb.DragDelta -= OnResizeBothDelta;
}
resizeBothThumb = GetTemplateChild("PART_ResizeBothThumb") as Thumb;
if (resizeBothThumb != null)
{
resizeBothThumb.DragDelta += OnResizeBothDelta;
}
scrollViewer = GetTemplateChild("PART_ScrollViewer") as ScrollViewer;
menuPanel = GetTemplateChild("PART_MenuPanel") as MenuPanel;
}
/// <summary>
/// When overridden in a derived class, is invoked whenever application code or internal processes call <see cref="M:System.Windows.FrameworkElement.ApplyTemplate"/>.
/// </summary>
public override void OnApplyTemplate()
{
this.UnSubscribeEvents();
this.isFirstTime = true;
if (this.DropDownPopup != null)
{
this.DropDownPopup.KeyUp -= this.OnDropDownPopupKeyUp;
}
this.DropDownPopup = this.Template.FindName("PART_Popup", this) as Popup;
if (this.DropDownPopup != null)
{
KeyboardNavigation.SetDirectionalNavigation(this.DropDownPopup, KeyboardNavigationMode.Cycle);
KeyboardNavigation.SetTabNavigation(this.DropDownPopup, KeyboardNavigationMode.Continue);
this.DropDownPopup.KeyUp += this.OnDropDownPopupKeyUp;
}
this.resizeVerticalThumb = this.Template.FindName("PART_ResizeVerticalThumb", this) as Thumb;
this.resizeBothThumb = this.Template.FindName("PART_ResizeBothThumb", this) as Thumb;
this.buttonBorder = this.Template.FindName("PART_ButtonBorder", this) as Border;
this.menuPanel = this.Template.FindName("PART_MenuPanel", this) as MenuPanel;
this.scrollViewer = this.Template.FindName("PART_ScrollViewer", this) as ScrollViewer;
base.OnApplyTemplate();
this.SubscribeEvents();
}
/// <summary>
/// Called when the template's tree is generated.
/// </summary>
public override void OnApplyTemplate()
{
if (popup != null)
{
popup.Opened -= OnDropDownOpened;
popup.Closed -= OnDropDownClosed;
}
popup = GetTemplateChild("PART_Popup") as Popup;
if (popup != null)
{
popup.Opened += OnDropDownOpened;
popup.Closed += OnDropDownClosed;
KeyboardNavigation.SetControlTabNavigation(popup, KeyboardNavigationMode.Cycle);
KeyboardNavigation.SetDirectionalNavigation(popup, KeyboardNavigationMode.Cycle);
KeyboardNavigation.SetTabNavigation(popup, KeyboardNavigationMode.Cycle);
}
if (resizeVerticalThumb != null)
{
resizeVerticalThumb.DragDelta -= OnResizeVerticalDelta;
}
resizeVerticalThumb = GetTemplateChild("PART_ResizeVerticalThumb") as Thumb;
if (resizeVerticalThumb != null)
{
resizeVerticalThumb.DragDelta += OnResizeVerticalDelta;
}
if (resizeBothThumb != null)
{
resizeBothThumb.DragDelta -= OnResizeBothDelta;
}
resizeBothThumb = GetTemplateChild("PART_ResizeBothThumb") as Thumb;
if (resizeBothThumb != null)
{
resizeBothThumb.DragDelta += OnResizeBothDelta;
}
scrollViewer = GetTemplateChild("PART_ScrollViewer") as ScrollViewer;
menuPanel = GetTemplateChild("PART_MenuPanel") as MenuPanel;
}