// Returns the previous sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null is no previous
internal override ProxySimple GetPreviousSibling(ProxySimple child)
{
GroupManager.GroupInfo groupInfo = GetGroupInfo(_hwnd, ID);
if (groupInfo)
{
int [] items = groupInfo._items;
int current = child._item;
// The subset link has an index that is one past the list items
// If we are on that then the previous is the last item in the items array.
if (_isComctrlV6OnOsVerV6orHigher && current == groupInfo._count)
{
int index = items [groupInfo._count - 1];
return(CreateListViewItem(index));
}
// find the index of the current lvitem
int prevLocation = groupInfo.IndexOf(current) - 1;
if (prevLocation <= -2)
{
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
if (prevLocation >= 0)
{
return(CreateListViewItem(items [prevLocation]));
}
}
return(null);
}
// retrieve lvitem column position in the Grid
// To be called only when Group is enabled
private int GetItemColumnPositionInGroup()
{
// get id of the group to which this item belongs
int groupID = GetGroupID(_hwnd, _item);
if (groupID != -1)
{
// get position of this lvitem within the array of all items in the group
GroupManager.GroupInfo groupInfo = WindowsListViewGroup.GetGroupInfo(_hwnd, groupID);
if (groupInfo)
{
int position = groupInfo.IndexOf(_item); //Array.IndexOf(groupInfo._items, _item);
if (position != -1)
{
// number of columns in the grid
int columnCount = WindowsListViewGroup.GetColumnCountExternal(_hwnd, groupID);
// item's row position
int itemRowPosition = position / columnCount;
// item's column position
return(position - (itemRowPosition * columnCount));
}
}
}
return(-1);
}
// Returns the last child element in the raw hierarchy.
internal override ProxySimple GetLastChild()
{
// return last item in this group
GroupManager.GroupInfo groupInfo = GetGroupInfo(_hwnd, ID);
// List view groups in vista can have an extra link at the end that says
// something like "show all 11 items...". If one exists expose it as the last child.
if (_isComctrlV6OnOsVerV6orHigher)
{
NativeMethods.LVGROUP_V6 group = new NativeMethods.LVGROUP_V6();
group.Init(Marshal.SizeOf(typeof(NativeMethods.LVGROUP_V6)));
group.iGroupID = _groupID;
group.mask = NativeMethods.LVGF_STATE;
group.stateMask = NativeMethods.LVGS_SUBSETED;
// Note: return code of GetGroupInfo() is not reliable.
XSendMessage.GetGroupInfo(_hwnd, ref group); // ignore return code.
// if we are not subseted then the last item is a regular listitem so
// it is ok to fall through and let that be created. Otherwise we need to
// create the subset link proxy.
if ((group.state & NativeMethods.LVGS_SUBSETED) != 0)
{
int [] items = groupInfo._items;
if (groupInfo._count <= 0 || groupInfo._count > items.Length)
{
return(null);
}
int index = items [groupInfo._count - 1];
return(CreateGroupSubsetLink(index + 1));
}
}
if (groupInfo)
{
int [] items = groupInfo._items;
if (groupInfo._count <= 0 || groupInfo._count > items.Length)
{
return(null);
}
int index = items [groupInfo._count - 1];
return(CreateListViewItem(index));
}
return(null);
}
// This method returns the count of either columns or rows
// in the Grid.
static private int GetCountOfItemsInDimension(IntPtr hwnd, int groupID, IsNewItemInDimension comparer)
{
// Algorithm:
// Get the rect of the item.
// Compare it using provided "comparer" with the previously obtained rect of the previous item in the grid
// if comparer returns New increase the count
int itemsCount = 0;
GroupManager.GroupInfo groupInfo = GetGroupInfo(hwnd, groupID);
if (groupInfo)
{
int [] items = groupInfo._items;
NativeMethods.Win32Rect rc;
NativeMethods.Win32Rect rcNext;
// get coordinates of the first item in the grid
if (WindowsListView.GetItemRect(hwnd, items[0], NativeMethods.LVIR_BOUNDS, out rc))
{
NewItemInDimension result = NewItemInDimension.New;
itemsCount++; // at least one exist
for (int i = 1; result != NewItemInDimension.Stop && i < groupInfo._count; i++)
{
if (!WindowsListView.GetItemRect(hwnd, items[i], NativeMethods.LVIR_BOUNDS, out rcNext))
{
// Fail to get rc, makes no sense to continue
System.Diagnostics.Debug.Assert(false, "GetCountOfItemsInDimension: failed to get item rect");
return(0);
}
result = comparer(rc, rcNext);
if (result == NewItemInDimension.New)
{
// found a change in the rect
// we either have a new column or new raw
itemsCount++;
// update the rc with the new coordinates
rc = rcNext;
}
}
}
return(itemsCount);
}
return(-1);
}
// Returns the first child element in the raw hierarchy.
internal override ProxySimple GetFirstChild()
{
// return first item in this group
GroupManager.GroupInfo groupInfo = GetGroupInfo(_hwnd, ID);
if (groupInfo)
{
int [] items = groupInfo._items;
int index = items [0];
return(CreateListViewItem(index));
}
return(null);
}
// Returns the next sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null if no next child
internal override ProxySimple GetNextSibling(ProxySimple child)
{
GroupManager.GroupInfo groupInfo = GetGroupInfo(_hwnd, ID);
if (groupInfo)
{
int [] items = groupInfo._items;
int current = child._item;
// find the index of the current lvitem
int nextLocation = groupInfo.IndexOf(current) + 1; //Array.IndexOf(items, current) + 1;
if (nextLocation <= 0)
{
// No more siblings
return(null);
}
if (nextLocation < groupInfo._count)
{
return(CreateListViewItem(items [nextLocation]));
}
// List view groups in vista can have an extra link at the end that says
// somthing like "show all 11 items..."
if (_isComctrlV6OnOsVerV6orHigher && nextLocation == groupInfo._count)
{
NativeMethods.LVGROUP_V6 group = new NativeMethods.LVGROUP_V6();
group.Init(Marshal.SizeOf(typeof(NativeMethods.LVGROUP_V6)));
group.iGroupID = _groupID;
group.mask = NativeMethods.LVGF_STATE;
group.stateMask = NativeMethods.LVGS_SUBSETED;
// Note: return code of GetGroupInfo() is not reliable.
XSendMessage.GetGroupInfo(_hwnd, ref group); // ignore return code.
// The items array holds the list items in this group. If we have a subset link we
// don't store it with the list items because it isn't really a list item. Instead we just
// create the subset link proxy with an item index one more than the last index.
if ((group.state & NativeMethods.LVGS_SUBSETED) != 0)
{
return(CreateGroupSubsetLink(items [groupInfo._count - 1] + 1));
}
}
}
return(null);
}
// Grid.GetCell implementation for detail mode
private IRawElementProviderSimple GetCellInDetailMode(int row, int column)
{
// Note: column can be used as it is
// row corresponds to the index into the array of items that belong to current group
GroupManager.GroupInfo groupInfo = GetGroupInfo(_hwnd, ID);
if (groupInfo)
{
int lvitemIndex = groupInfo._items [row];
ProxyFragment lvItem = CreateListViewItem(lvitemIndex);
return(new ListViewSubItem(_hwnd, lvItem, column, lvitemIndex));
}
return(null);
}
// 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);
}
// utility method returning object describing current group
static internal GroupManager.GroupInfo GetGroupInfo(IntPtr hwnd, int groupID)
{
GroupManager.GroupInfo groupInfo = GroupManager.GroupInfo.Null;
// if groupmanager is not available GetManager(hwnd)
// will raise needed event
GroupManager manager = WindowsListView._groupsCollection [hwnd];
groupInfo = manager.GetGroupInfo(groupID);
if (!groupInfo)
{
// LV control did not raise the needed event
// alexsn @
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
return(groupInfo);
}
// utility method returning object describing current group
static internal GroupManager.GroupInfo GetGroupInfo(IntPtr hwnd, int groupID)
{
GroupManager.GroupInfo groupInfo = GroupManager.GroupInfo.Null;
// if groupmanager is not available GetManager(hwnd)
// will raise needed event
GroupManager manager = WindowsListView._groupsCollection [hwnd];
groupInfo = manager.GetGroupInfo(groupID);
if (!groupInfo)
{
// LV control did not raise the needed event
// Microsoft - We may want to consider raising the event here
// The M7 work on checking if LE is valid however is the better way of going
// RemoveGroupAndRaiseLogicalChangedEvent(_hwnd);
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
return(groupInfo);
}
// retrieve number of rows in the group
static private int GetRowCount(IntPtr hwnd, int groupID)
{
if (WindowsListView.IsDetailMode(hwnd))
{
// When lv in Detail mode (with items shown in groups)
// each lvitem will live in their own row
// we need to detect how many items belong to the group,
// this would correspond to the number of rows
GroupManager.GroupInfo groupInfo = GetGroupInfo(hwnd, groupID);
if (groupInfo)
{
return(groupInfo._count);
}
// Good place to send Grid Invalid event
return(-1);
}
return(GetCountOfItemsInDimension(hwnd, groupID, new IsNewItemInDimension(IsNewRow)));
}
// Grid.GetCell implementation for lv that is not in detail mode
private IRawElementProviderSimple GetCellInOtherModes(int row, int column, int maxColumn)
{
// Convert row, column into the index into the array of items that belong to
// current group
int indexIntoArray = row * maxColumn + column;
GroupManager.GroupInfo groupInfo = GetGroupInfo(_hwnd, ID);
if (!groupInfo)
{
return(null);
}
if (indexIntoArray >= groupInfo._count)
{
// Return an empty cell
return(new EmptyGridItem(row, column, this));
}
// return cell
return(CreateListViewItem(groupInfo._items [indexIntoArray]));
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// get focused element
internal static ProxySimple GetFocusInGroup(IntPtr hwnd, ProxyFragment parent)
{
int index = WindowsListView.GetItemNext(hwnd, -1, NativeMethods.LVNI_FOCUSED);
if (index != -1)
{
// get id of the group to which item belongs
NativeMethods.LVITEM_V6 item = new NativeMethods.LVITEM_V6();
item.mask = NativeMethods.LVIF_GROUPID;
item.iItem = index;
if (XSendMessage.GetItem(hwnd, ref item))
{
WindowsListViewGroup group = new WindowsListViewGroup(hwnd, parent, item.iGroupID);
return(new ListViewItem(hwnd, group, index));
}
}
else
{
// if none of the items have focus see if the focus is on the subset link
// this only exists in v6 comctrl on vista or later.
if (Misc.IsComctrlV6OnOsVerV6orHigher(hwnd))
{
int groupIndex = (int)Misc.ProxySendMessage(hwnd, NativeMethods.LVM_GETFOCUSEDGROUP, IntPtr.Zero, IntPtr.Zero);
// need to convert the item id to a group id
NativeMethods.LVGROUP_V6 groupInfo = new NativeMethods.LVGROUP_V6();
groupInfo.Init(Marshal.SizeOf(typeof(NativeMethods.LVGROUP_V6)));
groupInfo.mask = NativeMethods.LVGF_GROUPID;
unsafe
{
bool lresult = XSendMessage.XSend(hwnd, NativeMethods.LVM_GETGROUPINFOBYINDEX, new IntPtr(groupIndex), new IntPtr(&groupInfo), Marshal.SizeOf(typeof(NativeMethods.LVGROUP_V6)));
if (!lresult)
{
// no group for this item should never happen.
return(null);
}
}
int groupId = groupInfo.iGroupID;
groupInfo.Init(Marshal.SizeOf(typeof(NativeMethods.LVGROUP_V6)));
groupInfo.iGroupID = groupId;
groupInfo.mask = NativeMethods.LVGF_STATE;
groupInfo.stateMask = NativeMethods.LVGS_SUBSETLINKFOCUSED;
// Note: return code of GetGroupInfo() is not reliable.
XSendMessage.GetGroupInfo(hwnd, ref groupInfo); // ignore return code.
if ((groupInfo.state & NativeMethods.LVGS_SUBSETLINKFOCUSED) != 0)
{
GroupManager.GroupInfo groupManagerInfo = GetGroupInfo(hwnd, groupId);
int [] items = groupManagerInfo._items;
if (groupManagerInfo._count <= 0 || groupManagerInfo._count >= items.Length)
{
return(null);
}
int sslIndex = items [groupManagerInfo._count - 1];
// The items array holds the list items in this group. If we have a subset link we
// don't store it with the list items because it isn't really a list item. Instead we just
// create the subset link proxy with an item index one more than the last index.
WindowsListViewGroup group = new WindowsListViewGroup(hwnd, parent, groupId);
return(group.CreateGroupSubsetLink(sslIndex + 1));
}
else
{
return(new WindowsListViewGroup(hwnd, parent, groupId));
}
}
}
return(null);
}
