// detect if this listviewitem needs to support GridItem pattern
static private bool IsImplementingGrid(IntPtr hwnd)
{
// in the detail mode, GridItem will be implemented on the subitem
// and not item
if (WindowsListView.IsDetailMode(hwnd))
{
return(false);
}
return(WindowsListView.IsListMode(hwnd) || WindowsListView.ListViewAutoArrange(hwnd));
}
// Scroll the specified headerItem horizontally into view.
internal void ScrollIntoView(HeaderItem headerItem)
{
// Check if the parent is a ListView
IntPtr hwndParent = NativeMethodsSetLastError.GetAncestor(_hwnd, NativeMethods.GA_PARENT);
if (hwndParent != IntPtr.Zero)
{
if (Misc.GetClassName(hwndParent).IndexOf("SysListView32", StringComparison.Ordinal) >= 0)
{
// Determine the number of pixels or columns to scroll horizontally.
int pixels = 0;
int columns = 0;
// Get first and last visible header items.
HeaderItem firstVisibleHeaderItem;
HeaderItem lastVisibleHeaderItem;
GetVisibleHeaderItemRange(out firstVisibleHeaderItem, out lastVisibleHeaderItem);
if (firstVisibleHeaderItem != null && firstVisibleHeaderItem._item > headerItem._item)
{
// Scroll backward.
pixels = (int)(headerItem.BoundingRectangle.Left - firstVisibleHeaderItem.BoundingRectangle.Left);
columns = headerItem._item - firstVisibleHeaderItem._item;
}
else if (lastVisibleHeaderItem != null && headerItem._item > lastVisibleHeaderItem._item)
{
// Scroll forward.
pixels = (int)(headerItem.BoundingRectangle.Left - lastVisibleHeaderItem.BoundingRectangle.Left);
columns = headerItem._item - lastVisibleHeaderItem._item;
}
int horizontalScrollAmount = 0;
if (WindowsListView.IsListMode(hwndParent))
{
// In list mode, LVM_SCROLL uses a column count.
horizontalScrollAmount = columns;
}
else if (WindowsListView.IsDetailMode(hwndParent))
{
// In details mode, LVM_SCROLL uses a pixel count.
horizontalScrollAmount = pixels;
}
if (horizontalScrollAmount != 0)
{
Misc.ProxySendMessage(hwndParent, NativeMethods.LVM_SCROLL, new IntPtr(horizontalScrollAmount), IntPtr.Zero);
}
}
}
}