private void panelDraw_MouseDown(object sender, MouseEventArgs e)
{
_mouseIsDown = true;
_lastMouseX = e.X;
ODGraphLegendItem clicked = null;
if (LegendDock == LegendDockType.Bottom)
{
clicked = _legendItems.
FirstOrDefault(x =>
new Rectangle(x.LocationBox.X + _scrollOffsetX, x.LocationBox.Y, x.LocationBox.Width, x.LocationBox.Height)
.Contains(e.X, e.Y));
}
else
{
clicked = _legendItems.
FirstOrDefault(x =>
new Rectangle(x.LocationBox.X, x.LocationBox.Y + panelDraw.AutoScrollPosition.Y, x.LocationBox.Width, x.LocationBox.Height)
.Contains(e.X, e.Y));
}
if (clicked == null)
{
return;
}
clicked.IsEnabled = !clicked.IsEnabled;
clicked.Filter();
}
private void panelDraw_MouseMove(object sender, MouseEventArgs e)
{
foreach (ODGraphLegendItem legendItem in _legendItems) //reset hovered status.
{
legendItem.Hovered = false;
}
if (!_mouseIsDown) //hovering
{
ODGraphLegendItem hovered = null;
if (LegendDock == LegendDockType.Bottom)
{
hovered = _legendItems //find the hovered item.
.FirstOrDefault(x => new Rectangle(x.LocationBox.X + _scrollOffsetX, x.LocationBox.Y, x.LocationBox.Width, x.LocationBox.Height)
.Contains(e.X, e.Y));
}
else
{
hovered = _legendItems //find the hovered item.
.FirstOrDefault(x => new Rectangle(x.LocationBox.X, x.LocationBox.Y + panelDraw.AutoScrollPosition.Y, x.LocationBox.Width, x.LocationBox.Height)
.Contains(e.X, e.Y));
}
if (hovered == null) //not hovering over a box, don't mark any hovered and redraw.
{
panelDraw.Invalidate();
return;
}
hovered.Hovered = true; //hovering over a box, mark that box as hovered and redraw.
panelDraw.Invalidate();
}
else //dragging
{
if (LegendDock != LegendDockType.Bottom) //no dragging for Left-Docked legends; they get a scrollbar.
{
return;
}
int move = e.X - _lastMouseX;
_lastMouseX = e.X;
_scrollOffsetX += move;
int maxScroll = _contentWidth - panelDraw.Width;
if (Math.Abs(_scrollOffsetX) > maxScroll)
{
_scrollOffsetX = -maxScroll;
}
if (_scrollOffsetX > 0)
{
_scrollOffsetX = 0;
}
panelDraw.Invalidate();
}
}
