static bool Contains(IntPtr root, IntPtr child)
{
if (root == IntPtr.Zero)
{
return(false);
}
for (var control = child; control != IntPtr.Zero;)
{
var parent = XplatUI.GetParent(control, true);
if (parent == root)
{
return(true);
}
control = parent;
}
return(false);
}
private Point CalculateShowPoint(Point position, ToolStripDropDownDirection direction, Size size)
{
var parent = XplatUI.GetParent(Handle, true);
var handle = parent == IntPtr.Zero ? Handle : parent;
var bestScreen = XplatUI.ScreenFromWindow(handle);
Point show_point = position;
if (this is ContextMenuStrip)
{
// If we are going to go offscreen, adjust our direction so we don't...
// X direction
switch (direction)
{
case ToolStripDropDownDirection.AboveLeft:
if (show_point.X - size.Width < bestScreen.WorkingArea.Left)
{
direction = ToolStripDropDownDirection.AboveRight;
}
break;
case ToolStripDropDownDirection.BelowLeft:
if (show_point.X - size.Width < bestScreen.WorkingArea.Left)
{
direction = ToolStripDropDownDirection.BelowRight;
}
break;
case ToolStripDropDownDirection.Left:
if (show_point.X - size.Width < bestScreen.WorkingArea.Left)
{
direction = ToolStripDropDownDirection.Right;
}
break;
case ToolStripDropDownDirection.AboveRight:
if (show_point.X + size.Width > bestScreen.WorkingArea.Right)
{
direction = ToolStripDropDownDirection.AboveLeft;
}
break;
case ToolStripDropDownDirection.BelowRight:
case ToolStripDropDownDirection.Default:
if (show_point.X + size.Width > bestScreen.WorkingArea.Right)
{
direction = ToolStripDropDownDirection.BelowLeft;
}
break;
case ToolStripDropDownDirection.Right:
if (show_point.X + size.Width > bestScreen.WorkingArea.Right)
{
direction = ToolStripDropDownDirection.Left;
}
break;
}
// Y direction
switch (direction)
{
case ToolStripDropDownDirection.AboveLeft:
if (show_point.Y - size.Height < bestScreen.WorkingArea.Top)
{
direction = ToolStripDropDownDirection.BelowLeft;
}
break;
case ToolStripDropDownDirection.AboveRight:
if (show_point.Y - size.Height < bestScreen.WorkingArea.Top)
{
direction = ToolStripDropDownDirection.BelowRight;
}
break;
case ToolStripDropDownDirection.BelowLeft:
if (show_point.Y + size.Height > bestScreen.WorkingArea.Bottom && show_point.Y - size.Height > 0)
{
direction = ToolStripDropDownDirection.AboveLeft;
}
break;
case ToolStripDropDownDirection.BelowRight:
case ToolStripDropDownDirection.Default:
if (show_point.Y + size.Height > bestScreen.WorkingArea.Bottom && show_point.Y - size.Height > 0)
{
direction = ToolStripDropDownDirection.AboveRight;
}
break;
case ToolStripDropDownDirection.Left:
if (show_point.Y + size.Height > bestScreen.WorkingArea.Bottom && show_point.Y - size.Height > 0)
{
direction = ToolStripDropDownDirection.AboveLeft;
}
break;
case ToolStripDropDownDirection.Right:
if (show_point.Y + size.Height > bestScreen.WorkingArea.Bottom && show_point.Y - size.Height > 0)
{
direction = ToolStripDropDownDirection.AboveRight;
}
break;
}
}
switch (direction)
{
case ToolStripDropDownDirection.AboveLeft:
show_point.Y -= size.Height;
show_point.X -= size.Width;
break;
case ToolStripDropDownDirection.AboveRight:
show_point.Y -= size.Height;
break;
case ToolStripDropDownDirection.BelowLeft:
show_point.X -= size.Width;
break;
case ToolStripDropDownDirection.Left:
show_point.X -= size.Width;
break;
case ToolStripDropDownDirection.Right:
break;
}
const int gap = 4;
// Fix offscreen horizontal positions
if ((show_point.X + size.Width) > bestScreen.WorkingArea.Right)
{
show_point.X = bestScreen.WorkingArea.Right - size.Width - gap;
}
if (show_point.X < bestScreen.WorkingArea.Left)
{
show_point.X = bestScreen.WorkingArea.Left + gap;
}
// Fix offscreen vertical positions
if ((show_point.Y + size.Height) > bestScreen.WorkingArea.Bottom)
{
show_point.Y = bestScreen.WorkingArea.Bottom - size.Height - gap;
}
if (show_point.Y < bestScreen.WorkingArea.Top)
{
show_point.Y = bestScreen.WorkingArea.Top + gap;
}
return(show_point);
}
