public virtual void DrawSelectionBackground(Graphics dc, Rectangle nodeRect, Node node)
{
Point mousePoint = m_owner.PointToClient(Cursor.Position);
Node hoverNode = m_owner.CalcHitNode(mousePoint);
if (m_owner.NodesSelection.Contains(node) || m_owner.FocusedNode == node)
{
Color col = m_owner.Focused ? SystemColors.Highlight : SystemColors.ControlLight;
if (!Application.RenderWithVisualStyles)
{
// have to fill the solid background only before the node is painted
dc.FillRectangle(SystemBrushes.FromSystemColor(col), nodeRect);
}
else
{
col = m_owner.Focused ? SystemColors.Highlight : Color.FromArgb(180, SystemColors.ControlDark);
// have to draw the transparent background after the node is painted
VisualStyleItemBackground.Style style = VisualStyleItemBackground.Style.Normal;
if (m_owner.Focused == false)
{
style = VisualStyleItemBackground.Style.Inactive;
}
VisualStyleItemBackground rendere = new VisualStyleItemBackground(style);
rendere.DrawBackground(m_owner, dc, nodeRect, col);
}
}
else if (hoverNode == node && m_owner.RowOptions.HoverHighlight)
{
Color col = SystemColors.ControlLight;
if (!Application.RenderWithVisualStyles)
{
// have to fill the solid background only before the node is painted
dc.FillRectangle(SystemBrushes.FromSystemColor(col), nodeRect);
}
else
{
// have to draw the transparent background after the node is painted
VisualStyleItemBackground.Style style = VisualStyleItemBackground.Style.Normal;
if (m_owner.Focused == false)
{
style = VisualStyleItemBackground.Style.Inactive;
}
VisualStyleItemBackground rendere = new VisualStyleItemBackground(style);
rendere.DrawBackground(m_owner, dc, nodeRect, col);
}
}
if (m_owner.Focused && (m_owner.FocusedNode == node))
{
nodeRect.Height += 1;
nodeRect.Inflate(-1, -1);
ControlPaint.DrawFocusRectangle(dc, nodeRect);
}
}
protected override bool GetHitTest(Point point)
{
// if mouse is over node, columns or scrollbar then return true
// which will cause the mouse event to be forwarded to the control
TreeListView tree = Control as TreeListView;
point = tree.PointToClient(point);
Node node = tree.CalcHitNode(point);
if (node != null)
{
return(true);
}
TreelistView.HitInfo colinfo = tree.CalcColumnHit(point);
if ((int)(colinfo.HitType & HitInfo.eHitType.kColumnHeader) > 0)
{
return(true);
}
if (tree.HitTestScrollbar(point))
{
return(true);
}
return(base.GetHitTest(point));
}
private void timer_Tick(object sender, EventArgs e)
{
// get node at mouse position
Point pt = treeView.PointToClient(MousePosition);
TreeListViewItem node = this.treeView.GetItemAt(pt);
if (node == null)
{
return;
}
// if mouse is near to the top, scroll up
if (pt.Y < 30)
{
// set actual node to the upper one
if (node.PrevVisibleItem != null)
{
node = node.PrevVisibleItem;
// hide drag image
ImageList_DragShowNolock(false);
// scroll and refresh
node.EnsureVisible();
this.treeView.Refresh();
// show drag image
ImageList_DragShowNolock(true);
}
}
// if mouse is near to the bottom, scroll down
else if (pt.Y > this.treeView.Size.Height - 30)
{
if (node.NextVisibleItem != null)
{
node = node.NextVisibleItem;
ImageList_DragShowNolock(false);
node.EnsureVisible();
this.treeView.Refresh();
ImageList_DragShowNolock(true);
}
}
}