/// <summary>
/// Prepares the checkbox by creating bindings and hooking events.
/// </summary>
/// <param name="element">The container element.</param>
/// <param name="item">The data item.</param>
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
MatchingTermItemContainer container = (MatchingTermItemContainer)element;
if (this.ItemContainerStyle != null)
{
container.Style = this.ItemContainerStyle;
}
container.GotFocus += new RoutedEventHandler(this.Container_GotFocus);
container.LostFocus += new RoutedEventHandler(this.Container_LostFocus);
container.MouseEnter += new MouseEventHandler(this.Container_MouseEnter);
container.MouseLeave += new MouseEventHandler(this.Container_MouseLeave);
container.MouseEnterPopup += new MouseEventHandler(this.Container_MouseEnter);
container.MouseLeavePopup += new MouseEventHandler(this.Container_MouseLeave);
container.SelectionChanged += new EventHandler(this.Container_SelectionChanged);
container.PopupOpening += new EventHandler(this.Container_PopupOpening);
container.DataContext = item;
container.SelectedItemMemberPath = this.SelectedItemMemberPath;
container.AlternateItemsMemberPath = this.AlternateItemsMemberPath;
container.SelectedItemTextMemberPath = this.SelectedItemTextMemberPath;
container.FlyOutContentTemplate = this.FlyOutContentTemplate;
container.EncodedItemTemplate = this.EncodedItemTemplate;
container.IsSelectedMemberPath = this.IsSelectedMemberPath;
System.Windows.Data.Binding lengthBinding = new System.Windows.Data.Binding(this.LengthMemberPath);
lengthBinding.Mode = System.Windows.Data.BindingMode.TwoWay;
container.SetBinding(MatchingTermItemContainer.SelectedItemTextLengthProperty, lengthBinding);
this.containers.Add(container);
this.containersByItem.Add(item, container);
}
/// <summary>
/// Unhooks the checkbox events before clearing the container.
/// </summary>
/// <param name="element">The container element.</param>
/// <param name="item">The data item.</param>
protected override void ClearContainerForItemOverride(DependencyObject element, object item)
{
base.ClearContainerForItemOverride(element, item);
MatchingTermItemContainer container = (MatchingTermItemContainer)element;
container.GotFocus -= new RoutedEventHandler(this.Container_GotFocus);
container.LostFocus -= new RoutedEventHandler(this.Container_LostFocus);
container.MouseEnter -= new MouseEventHandler(this.Container_MouseEnter);
container.MouseLeave -= new MouseEventHandler(this.Container_MouseLeave);
container.MouseEnterPopup -= new MouseEventHandler(this.Container_MouseEnter);
container.MouseLeavePopup -= new MouseEventHandler(this.Container_MouseLeave);
container.SelectionChanged -= new EventHandler(this.Container_SelectionChanged);
container.PopupOpening -= new EventHandler(this.Container_PopupOpening);
this.containers.Remove(container);
this.containersByItem.Remove(container.DataContext);
}
/// <summary>
/// Scrolls and item into view.
/// </summary>
/// <param name="item">The item to scroll into view.</param>
public void ScrollIntoView(object item)
{
if (this.scrollViewer != null && this.containersByItem.ContainsKey(item))
{
MatchingTermItemContainer container = this.containersByItem[item];
if (System.Windows.Media.VisualTreeHelper.GetParent(container) != null)
{
System.Windows.Media.GeneralTransform transform = container.TransformToVisual(this.scrollViewer);
double verticalOffset = transform.Transform(new Point(0, 0)).Y;
if (verticalOffset + container.ActualHeight > this.scrollViewer.ViewportHeight)
{
this.scrollViewer.ScrollToVerticalOffset(this.scrollViewer.VerticalOffset + (verticalOffset - this.scrollViewer.ViewportHeight) + container.ActualHeight);
}
else if (verticalOffset < 0)
{
this.scrollViewer.ScrollToVerticalOffset(this.scrollViewer.VerticalOffset + verticalOffset);
}
}
}
}
/// <summary>
/// Updates the visual state of the control.
/// </summary>
/// <param name="dependencyObject">The instance of the container control.</param>
/// <param name="args">Dependency Property Changed Event Args.</param>
private static void OnStateChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
{
MatchingTermItemContainer container = (MatchingTermItemContainer)dependencyObject;
container.UpdateVisualState(true);
}
/// <summary>
/// Updates the alternate items member path.
/// </summary>
/// <param name="dependencyObject">The MatchingTermItemContainer.</param>
/// <param name="eventArgs">Dependency Property Changed Event Args.</param>
private static void AlternateItemsMemberPath_Changed(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs eventArgs)
{
MatchingTermItemContainer container = (MatchingTermItemContainer)dependencyObject;
container.UpdateAlternateItemsMemberPath();
}
/// <summary>
/// Generates a check box as the item container.
/// </summary>
/// <returns>A checkbox item container.</returns>
protected override DependencyObject GetContainerForItemOverride()
{
MatchingTermItemContainer matchingTermItemContainer = new MatchingTermItemContainer();
return(matchingTermItemContainer);
}
/// <summary>
/// Changes the text for a specific term.
/// <para>
/// This method uses the start index (from term item) to move through the decorator textbox
/// items, and update the text in the item to show the new text. If the new text is longer,
/// more text box items are inserted. If the new text is shorter, text box items are removed.
/// </para>
/// <para>
/// The text box text is then updated with the change, flagging that the change is a programmatic
/// change. And finally, each term item that comes after the changed item, has the start index
/// updated with its new start position.
/// </para>
/// </summary>
/// <param name="termContainer">The term container to update.</param>
internal void ChangeText(MatchingTermItemContainer termContainer)
{
if (termContainer != null)
{
TermItem termItem = this.termItemsControl.GetContainerFromItem(termContainer.DataContext);
if (termItem != null)
{
if (this.textBox != null)
{
this.programaticTextChangeCount++;
}
int count = 0;
bool mouseHighlighted = false;
bool focusHighlighted = false;
for (int i = termItem.StartIndex; i < Math.Min(termItem.StartIndex + termItem.Length, termItem.StartIndex + termContainer.SelectedItemText.Length); i++)
{
if (i == termItem.StartIndex)
{
focusHighlighted = this.textBoxItems[i].IsFocusHighlighted;
mouseHighlighted = this.textBoxItems[i].IsMouseHighlighted;
}
this.textBoxItems[i].Text = termContainer.SelectedItemText[count].ToString(CultureInfo.CurrentCulture);
count++;
}
if (termItem.Length < termContainer.SelectedItemText.Length)
{
if (termItem.Length > 1)
{
this.textBoxItems[termItem.StartIndex + termItem.Length - 1].ContainerPosition = ContainerPosition.Middle;
}
else
{
this.textBoxItems[termItem.StartIndex].ContainerPosition = ContainerPosition.Start;
}
for (int i = termItem.StartIndex + termItem.Length; i < termItem.StartIndex + termContainer.SelectedItemText.Length; i++)
{
DecoratorTextBoxItem textBoxItem = new DecoratorTextBoxItem(termContainer.SelectedItemText[i - termItem.StartIndex].ToString(CultureInfo.CurrentCulture));
if (i == termItem.StartIndex + termContainer.SelectedItemText.Length - 1)
{
textBoxItem.ContainerPosition = ContainerPosition.End;
}
else
{
textBoxItem.ContainerPosition = ContainerPosition.Middle;
}
textBoxItem.IsFocusHighlighted = focusHighlighted;
textBoxItem.IsMouseHighlighted = mouseHighlighted;
textBoxItem.AddTermItem(termItem);
this.textBoxItems.Insert(i, textBoxItem);
}
}
else if (termItem.Length > termContainer.SelectedItemText.Length)
{
for (int i = termItem.StartIndex + termContainer.SelectedItemText.Length; i < termItem.StartIndex + termItem.Length; i++)
{
this.textBoxItems.RemoveAt(termItem.StartIndex + termContainer.SelectedItemText.Length);
}
if (termContainer.SelectedItemText.Length > 1)
{
this.textBoxItems[termItem.StartIndex + termContainer.SelectedItemText.Length - 1].ContainerPosition = ContainerPosition.End;
}
else
{
this.textBoxItems[termItem.StartIndex].ContainerPosition = ContainerPosition.Only;
}
}
if (this.textBox != null)
{
string newText = this.textBox.Text.Remove(termItem.StartIndex, termItem.Length);
newText = newText.Insert(termItem.StartIndex, termContainer.SelectedItemText);
this.textBox.Text = newText;
}
foreach (TermItem item in this.termItemsControl.TermItems)
{
if (item.StartIndex > termItem.StartIndex)
{
item.StartIndex += termContainer.SelectedItemText.Length - termItem.Length;
}
}
termItem.Length = termContainer.SelectedItemText.Length;
}
}
}
