/// <devdoc>
/// Gets the real index for the given item. lastIndex is the last return
/// value from GetDisplayIndex, or -1 if you don't know. If provided,
/// the search for the index can be greatly improved.
/// </devdoc>
internal int GetDisplayIndex(ListViewItem item, int lastIndex) {
Debug.Assert(item.listView == this, "Can't GetDisplayIndex if the list item doesn't belong to us");
Debug.Assert(item.ID != -1, "ListViewItem has no ID yet");
ApplyUpdateCachedItems();
if (IsHandleCreated && !ListViewHandleDestroyed) {
Debug.Assert(listItemsArray == null, "listItemsArray not null, even though handle created");
NativeMethods.LVFINDINFO info = new NativeMethods.LVFINDINFO();
info.lParam = (IntPtr) item.ID;
info.flags = NativeMethods.LVFI_PARAM;
int displayIndex = -1;
if (lastIndex != -1) {
displayIndex = (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.LVM_FINDITEM, lastIndex - 1, ref info);
}
if (displayIndex == -1) {
displayIndex = (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.LVM_FINDITEM, -1 /* beginning */, ref info);
}
Debug.Assert(displayIndex != -1, "This item is in the list view -- why can't we find a display index for it?");
return displayIndex;
}
else {
// PERF: The only reason we should ever call this before the handle is created
// is if the user calls ListViewItem.Index.
Debug.Assert(listItemsArray != null, "listItemsArray is null, but the handle isn't created");
int index = 0;
foreach (object o in listItemsArray) {
if (o == item)
return index;
index++;
}
return -1;
}
}
private ListViewItem FindItem(bool isTextSearch, string text, bool isPrefixSearch, Point pt, SearchDirectionHint dir, int startIndex, bool includeSubItemsInSearch) {
if (this.Items.Count == 0) {
return null;
}
if (!IsHandleCreated)
CreateHandle();
if (VirtualMode) {
SearchForVirtualItemEventArgs sviEvent = new SearchForVirtualItemEventArgs(isTextSearch, isPrefixSearch, includeSubItemsInSearch, text, pt, dir, startIndex);
OnSearchForVirtualItem(sviEvent);
// NOTE: this will cause a RetrieveVirtualItem event w/o a corresponding cache hint event.
if (sviEvent.Index != -1) {
return this.Items[sviEvent.Index];
} else {
return null;
}
} else {
NativeMethods.LVFINDINFO lvFindInfo = new NativeMethods.LVFINDINFO();
if (isTextSearch) {
lvFindInfo.flags = NativeMethods.LVFI_STRING;
lvFindInfo.flags |= (isPrefixSearch ? NativeMethods.LVFI_PARTIAL : 0);
lvFindInfo.psz = text;
} else {
lvFindInfo.flags = NativeMethods.LVFI_NEARESTXY;
lvFindInfo.ptX = pt.X;
lvFindInfo.ptY = pt.Y;
// we can do this because SearchDirectionHint is set to the VK_*
lvFindInfo.vkDirection = (int)dir;
}
lvFindInfo.lParam = IntPtr.Zero;
int index = (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, this.Handle),
NativeMethods.LVM_FINDITEM,
startIndex-1, // decrement startIndex so that the search is 0-based
ref lvFindInfo);
if (index >= 0) {
return Items[index];
} else if (isTextSearch && includeSubItemsInSearch) {
// win32 listView control can't search inside sub items
for (int i = startIndex; i < this.Items.Count; i ++) {
ListViewItem lvi = this.Items[i];
for (int j = 0; j < lvi.SubItems.Count; j ++) {
ListViewItem.ListViewSubItem lvsi = lvi.SubItems[j];
// the win32 list view search for items w/ text is case insensitive
// do the same for sub items
// because we are comparing user defined strings we have to do the slower String search
// ie, use String.Compare(string, string, case sensitive, CultureInfo)
// instead of new Whidbey String.Equals overload
// String.Equals(string, string, StringComparison.OrdinalIgnoreCase
if (String.Equals(text,lvsi.Text, StringComparison.OrdinalIgnoreCase)) {
return lvi;
} else if (isPrefixSearch && CultureInfo.CurrentCulture.CompareInfo.IsPrefix(lvsi.Text, text, CompareOptions.IgnoreCase)) {
return lvi;
}
}
}
return null;
} else {
return null;
}
}
}
