// perform a hit test on the specific point
// POINT is in screen coordinates
static internal NativeMethods.LVHITTESTINFO_INTERNAL SubitemHitTest (IntPtr hwnd, int item, NativeMethods.Win32Point pt)
{
// Allocate a local LVHITTESTINFO struct.
NativeMethods.LVHITTESTINFO_INTERNAL hitTest = new NativeMethods.LVHITTESTINFO_INTERNAL ();
// Set the point of interest.
hitTest.pt = pt;
hitTest.iItem = item;
int result = -1;
// convert to client
if (Misc.MapWindowPoints(IntPtr.Zero, hwnd, ref hitTest.pt, 1))
{
unsafe
{
// Send the LVM_SUBITEMHITTEST message to the list view owner process.
// This is ok to do even for non LVS_REPORT listview, since in that case this
// message will behaive like LVM_HITTEST
if (Misc.IsComctrlV6OnOsVerV6orHigher(hwnd))
{
NativeMethods.LVHITTESTINFO_V6 hitTestNative = new NativeMethods.LVHITTESTINFO_V6(hitTest);
result = XSendMessage.XSendGetIndex(hwnd, NativeMethods.LVM_SUBITEMHITTEST, IntPtr.Zero, new IntPtr(&hitTestNative), Marshal.SizeOf(hitTestNative.GetType()));
hitTest.flags = hitTestNative.flags;
hitTest.iItem = hitTestNative.iItem;
hitTest.iGroup = hitTestNative.iGroup;
}
else
{
NativeMethods.LVHITTESTINFO hitTestNative = new NativeMethods.LVHITTESTINFO(hitTest);
result = XSendMessage.XSendGetIndex(hwnd, NativeMethods.LVM_SUBITEMHITTEST, IntPtr.Zero, new IntPtr(&hitTestNative), Marshal.SizeOf(hitTestNative.GetType()));
hitTest.flags = hitTestNative.flags;
hitTest.iItem = hitTestNative.iItem;
}
}
}
if (result == -1)
{
hitTest.iSubItem = hitTest.iItem = -1;
}
return hitTest;
}
// Returns a Proxy element corresponding to the specified screen coordinates.
internal override ProxySimple ElementProviderFromPoint (int x, int y)
{
NativeMethods.Win32Point pt = new NativeMethods.Win32Point (x, y);
NativeMethods.LVHITTESTINFO_INTERNAL hitTest = WindowsListView.SubitemHitTest (_hwnd, pt);
if ((hitTest.flags & NativeMethods.LVHT_EX_GROUP_HEADER) != 0)
{
return this;
}
if ((hitTest.flags & NativeMethods.LVHT_ONITEM) != 0 && hitTest.iItem >= 0)
{
// create the item
return new ListViewItem (_hwnd, this, hitTest.iItem);
}
// If we did not land on an item we may be at a subset link these only exist
// in v6 comctrl and vista or later.
if (_isComctrlV6OnOsVerV6orHigher)
{
// Allocate a local LVHITTESTINFO struct.
NativeMethods.LVHITTESTINFO_V6 hitTestNative = new NativeMethods.LVHITTESTINFO_V6(hitTest);
unsafe
{
XSendMessage.XSendGetIndex(_hwnd, NativeMethods.LVM_HITTEST, new IntPtr(-1), new IntPtr(&hitTestNative), Marshal.SizeOf(hitTestNative.GetType()));
}
if ((hitTestNative.flags & NativeMethods.LVHT_EX_GROUP_SUBSETLINK) != 0)
{
GroupManager.GroupInfo groupInfo = GetGroupInfo (_hwnd, ID);
int [] items = groupInfo._items;
if (groupInfo._count <= 0 || groupInfo._count > items.Length)
{
return null;
}
int index = items [groupInfo._count - 1];
return CreateGroupSubsetLink(index + 1);
}
}
return this;
}
