/// <summary>
/// Set the state of the passed Listview item's index.
/// </summary>
/// <param name="index">Listview item's index.</param>
/// <param name="selected">Select the passed item?</param>
public void SelectItem(int index, bool selected)
{
var ptrItem = IntPtr.Zero;
try
{
// Determine whether selecting or unselecting.
uint select = selected ? (uint)ListViewCallBackMask.LVIS_SELECTED : 0;
// Fill in the LVITEM structure with state fields.
var stateItem = new LvItem
{
Mask = (uint)ListViewItemMask.LVIF_STATE,
Item = index,
SubItem = 0,
State = @select,
StateMask = (uint)ListViewCallBackMask.LVIS_SELECTED
};
// Copy the structure to unmanaged memory.
ptrItem = Marshal.AllocHGlobal(Marshal.SizeOf(stateItem.GetType()));
Marshal.StructureToPtr(stateItem, ptrItem, true);
// Send the message to the control window.
Win32.SendMessage(
this.Handle,
(int)ListViewMessages.LVM_SETITEMSTATE,
(IntPtr)index,
ptrItem);
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine($"VirtualListView.SetItemState error={ex.Message}");
// TODO: should this eat any exceptions?
throw;
}
finally
{
// Always release the unmanaged memory.
if (ptrItem != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptrItem);
}
}
}
/// <summary>
/// Set the state of the passed Listview item's index.
/// </summary>
/// <param name="index">Listview item's index.</param>
/// <param name="selected">Select the passed item?</param>
public void SelectItem(int index, bool selected)
{
var ptrItem = IntPtr.Zero;
try
{
// Determine whether selecting or unselecting.
uint select = selected ? (uint)ListViewCallBackMask.LVIS_SELECTED : 0;
// Fill in the LVITEM structure with state fields.
var stateItem = new LvItem
{
Mask = (uint)ListViewItemMask.LVIF_STATE,
Item = index,
SubItem = 0,
State = @select,
StateMask = (uint)ListViewCallBackMask.LVIS_SELECTED
};
// Copy the structure to unmanaged memory.
ptrItem = Marshal.AllocHGlobal(Marshal.SizeOf(stateItem.GetType()));
Marshal.StructureToPtr(stateItem, ptrItem, true);
// Send the message to the control window.
Win32.SendMessage(
this.Handle,
(int)ListViewMessages.LVM_SETITEMSTATE,
index,
ptrItem.ToInt32());
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine("VirtualListView.SetItemState error=" + ex.Message);
// TODO: should this eat any exceptions?
throw;
}
finally
{
// Always release the unmanaged memory.
if (ptrItem != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptrItem);
}
}
}
