// DON'T USE THIS SNIPPET -- PROBABLY NOT RAISING CORRECT EVENTS
// <Snippet118>
/// <summary>
/// Selects an item in the myItems collection.
/// </summary>
/// <param name="index">Index of the selected item.</param>
/// <remarks>
/// This is a single-selection list whose current selection is stored
/// internally in mySelection.
/// MyListItem is the provider class for list items.
/// </remarks>
public void Select(int index)
{
if (index >= myItems.Count)
{
throw new ArgumentOutOfRangeException();
}
else if (index < 0)
{
mySelection = -1;
return;
}
else
// If within range, clear the Selected property on the current item
// and set it on the new item.
{
MyListItem newItem;
MyListItem oldItem = null;
// Deselect old item, if there is one; list might not be initialized.
if (mySelection >= 0)
{
oldItem = myItems[mySelection] as MyListItem;
oldItem.Selected = false;
}
mySelection = index;
newItem = myItems[mySelection] as MyListItem;
newItem.Selected = true;
// Raise events that clients can receive.
if (AutomationInteropProvider.ClientsAreListening)
{
// Generic event for selection made.
AutomationEventArgs args = new AutomationEventArgs(SelectionItemPatternIdentifiers.ElementSelectedEvent);
AutomationInteropProvider.RaiseAutomationEvent(SelectionItemPattern.ElementSelectedEvent,
(IRawElementProviderSimple)myItems[mySelection], args);
// Property-changed event for old item's Selection property.
AutomationPropertyChangedEventArgs propArgs;
if (oldItem != null)
{
propArgs = new AutomationPropertyChangedEventArgs(
SelectionItemPatternIdentifiers.IsSelectedProperty, true, false);
AutomationInteropProvider.RaiseAutomationPropertyChangedEvent(oldItem, propArgs);
}
// Property-changed event for new item's Selection property.
propArgs = new AutomationPropertyChangedEventArgs(
SelectionItemPatternIdentifiers.IsSelectedProperty, false, true);
AutomationInteropProvider.RaiseAutomationPropertyChangedEvent(newItem, propArgs);
}
}
}
// </Snippet123>
/// <summary>
/// Add an item to the list.
/// </summary>
/// <param name="text">Item to add.</param>
/// <returns>Index of the added item.</returns>
public int Add(String text)
{
// Dynamically resize the control. To keep things simple for this example,
// it is assumed that there will be no need for scrolling.
if (myItems.Count > 0)
{
this.Height += itemHeight;
}
// Initialize the selection.
if (mySelection < 0)
{
mySelection = 0;
}
// Create the item and add it.
int itemTop = DisplayRectangle.Top + (itemHeight * myItems.Count) + 1;
int itemLeft = DisplayRectangle.Left + 1;
int itemWidth = DisplayRectangle.Width - 2;
MyListItem listItem = new MyListItem(this, myItems, text, new Rectangle(itemTop, itemLeft, itemWidth, itemHeight));
return(myItems.Add(listItem));
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="listItem">Item for which this pattern is implemented.</param>
/// <param name="parent">List that contains the item.</param>
public ListItemPattern(MyListItem listItem, ParentList parent)
{
myListItem = listItem;
parentList = parent;
selectedItems = new ArrayList();
}
