/// <summary>Retrieves an element with the specified property value.</summary>
/// <param name="startAfter">The item in the container after which to begin the search.</param>
/// <param name="propertyId">The property that contains the value to retrieve.</param>
/// <param name="value">The value to retrieve.</param>
/// <returns>The first item that matches the search criterion; otherwise, <see langword="null" /> if no items match.</returns>
// Token: 0x060025DD RID: 9693 RVA: 0x000B555C File Offset: 0x000B375C
IRawElementProviderSimple IItemContainerProvider.FindItemByProperty(IRawElementProviderSimple startAfter, int propertyId, object value)
{
base.ResetChildrenCache();
if (propertyId != 0 && !this.IsPropertySupportedByControlForFindItem(propertyId))
{
throw new ArgumentException(SR.Get("PropertyNotSupported"));
}
ItemsControl itemsControl = (ItemsControl)base.Owner;
IList list = null;
if (itemsControl != null)
{
list = this.OwningDataGrid.Columns;
}
if (list != null && list.Count > 0)
{
DataGridColumnHeaderItemAutomationPeer dataGridColumnHeaderItemAutomationPeer = null;
if (startAfter != null)
{
dataGridColumnHeaderItemAutomationPeer = (base.PeerFromProvider(startAfter) as DataGridColumnHeaderItemAutomationPeer);
if (dataGridColumnHeaderItemAutomationPeer == null)
{
return(null);
}
}
int num = 0;
if (dataGridColumnHeaderItemAutomationPeer != null)
{
if (dataGridColumnHeaderItemAutomationPeer.Item == null)
{
throw new InvalidOperationException(SR.Get("InavalidStartItem"));
}
num = list.IndexOf(dataGridColumnHeaderItemAutomationPeer.Column) + 1;
if (num == 0 || num == list.Count)
{
return(null);
}
}
if (propertyId == 0)
{
for (int i = num; i < list.Count; i++)
{
if (list.IndexOf(list[i]) == i)
{
return(base.ProviderFromPeer(this.FindOrCreateItemAutomationPeer(list[i])));
}
}
}
object obj = null;
for (int j = num; j < list.Count; j++)
{
ItemAutomationPeer itemAutomationPeer = this.FindOrCreateItemAutomationPeer(list[j]);
if (itemAutomationPeer != null)
{
try
{
obj = this.GetSupportedPropertyValue(itemAutomationPeer, propertyId);
}
catch (Exception ex)
{
if (ex is ElementNotAvailableException)
{
goto IL_16B;
}
}
if (value == null || obj == null)
{
if (obj == null && value == null && list.IndexOf(list[j]) == j)
{
return(base.ProviderFromPeer(itemAutomationPeer));
}
}
else if (value.Equals(obj) && list.IndexOf(list[j]) == j)
{
return(base.ProviderFromPeer(itemAutomationPeer));
}
}
IL_16B :;
}
}
return(null);
}
///<summary>
/// Find Childrend Peers based on Automation Properties.
/// Used to enable virtualization with automation.
///
/// GetChildrenCore and FindItemByProperty are almost straight copies of the
/// ItemControlAutomationPeer code; however since DataGridColumHeaderPresenter
/// returns the Column.Header's as the items some specialized code was needed to
/// create and store peers.
///</summary>
IRawElementProviderSimple IItemContainerProvider.FindItemByProperty(IRawElementProviderSimple startAfter, int propertyId, object value)
{
ResetChildrenCache();
// Checks if propertyId is valid else throws ArgumentException to notify it as invalid argument is being passed
if (propertyId != 0)
{
if (!IsPropertySupportedByControlForFindItem(propertyId))
{
throw new ArgumentException(SR.Get(SRID.PropertyNotSupported));
}
}
ItemsControl owner = (ItemsControl)Owner;
IList items = null;
if (owner != null)
{
items = OwningDataGrid.Columns;
}
if (items != null && items.Count > 0)
{
DataGridColumnHeaderItemAutomationPeer startAfterItem = null;
if (startAfter != null)
{
// get the peer corresponding to this provider
startAfterItem = PeerFromProvider(startAfter) as DataGridColumnHeaderItemAutomationPeer;
if (startAfterItem == null)
{
return(null);
}
}
// startIndex refers to the index of the item just after startAfterItem
int startIndex = 0;
if (startAfterItem != null)
{
if (startAfterItem.Item == null)
{
throw new InvalidOperationException(SR.Get(SRID.InavalidStartItem));
}
// To find the index of the column items collection which occurs
// immidiately after startAfterItem.Item
startIndex = items.IndexOf(startAfterItem.Column) + 1;
if (startIndex == 0 || startIndex == items.Count)
{
return(null);
}
}
if (propertyId == 0)
{
for (int i = startIndex; i < items.Count; i++)
{
// This is to handle the case of when dataItems are just plain strings and have duplicates,
// only the first occurence of duplicate Items will be returned. It has also been used couple more times below.
if (items.IndexOf(items[i]) != i)
{
continue;
}
return(ProviderFromPeer(FindOrCreateItemAutomationPeer(items[i])));
}
}
ItemAutomationPeer currentItemPeer;
object currentValue = null;
for (int i = startIndex; i < items.Count; i++)
{
currentItemPeer = FindOrCreateItemAutomationPeer(items[i]);
if (currentItemPeer == null)
{
continue;
}
try
{
currentValue = GetSupportedPropertyValue(currentItemPeer, propertyId);
}
catch (Exception ex)
{
if (ex is ElementNotAvailableException)
{
continue;
}
}
if (value == null || currentValue == null)
{
// Accept null as value corresponding to the property if it finds an item with null as the value of corresponding property else ignore.
if (currentValue == null && value == null && items.IndexOf(items[i]) == i)
{
return(ProviderFromPeer(currentItemPeer));
}
else
{
continue;
}
}
// Match is found within the specified criterion of search
if (value.Equals(currentValue) && items.IndexOf(items[i]) == i)
{
return(ProviderFromPeer(currentItemPeer));
}
}
}
return(null);
}
