protected override bool ProcessKeyPreview(ref Message m)
{
if (m.Msg == WM_KEYDOWN)
{
int? nCurrentIndex = CurrentItemIndex;
Keys key = (Keys)m.WParam;
if (ItemControl != null && ItemControl.ShouldManageKey(key))
{
return(false);
}
switch (key)
{
case Keys.Down:
if (nCurrentIndex != null)
{
int nIndex = nCurrentIndex.Value + 1;
while (nIndex < m_listeItems.Count && m_listeItems[nIndex].IsMasque)
{
nIndex++;
}
if (nIndex < m_listeItems.Count)
{
CurrentItemIndex = nIndex;
}
return(true);
}
break;
case Keys.Up:
if (nCurrentIndex != null)
{
int nIndex = nCurrentIndex.Value - 1;
while (nIndex >= 0 && m_listeItems[nIndex].IsMasque)
{
nIndex--;
}
if (nIndex >= 0)
{
CurrentItemIndex = nIndex;
}
return(true);
}
break;
case Keys.PageDown:
if (nCurrentIndex != null)
{
int nY = GetItemTop(nCurrentIndex.Value);
int?nItem = GetItemIndexAtPosition(nY + m_panelDessin.ClientSize.Height - 10);
if (nItem != null)
{
if (nItem == nCurrentIndex)
{
nItem++;
}
CurrentItemIndex = nItem.Value;
}
else
{
CurrentItemIndex = m_listeItems.Count - 1;
}
}
break;
case Keys.PageUp:
if (nCurrentIndex != null)
{
int nY = GetItemTop(nCurrentIndex.Value);
int?nItem = GetItemIndexAtPosition(nY - m_panelDessin.ClientSize.Height - 10);
if (nItem != null)
{
if (nItem == nCurrentIndex)
{
nItem++;
}
CurrentItemIndex = nItem.Value;
}
else
{
CurrentItemIndex = 0;
}
}
break;
case Keys.Home:
if (m_listeItems.Count > 0)
{
CurrentItemIndex = 0;
return(true);
}
break;
case Keys.End:
if (m_listeItems.Count > 0)
{
int nIndex = m_listeItems.Count - 1;
while (nIndex >= 0 && m_listeItems[nIndex].IsMasque)
{
nIndex--;
}
CurrentItemIndex = nIndex;
return(true);
}
break;
}
}
return(base.ProcessKeyPreview(ref m));
}