public Size getPreferredSize()
{
float dy = 0;
float dx = 0;
for (int i = 0; i < constraints.Count; i++)
{
GridPanelConstraint c = (GridPanelConstraint)constraints[i];
Size d = c.component.Size;
dx = Math.Max(dx, d.Width / c.width);
dy = Math.Max(dy, d.Height / c.height);
}
dx += hgap;
dy += vgap;
dx *= cols;
dy *= rows;
dx += insets.left + insets.right;
dy += insets.top + insets.bottom;
return(new Size((int)dx, (int)dy));
}
public void doLayout()
{
Size size = Size;
size.Height -= insets.top + insets.bottom;
size.Width -= insets.left + insets.right;
float cellWidth = size.Width / cols;
float cellHeight = size.Height / rows;
for (int i = 0; i < constraints.Count; i++)
{
GridPanelConstraint c = (GridPanelConstraint)constraints[i];
float x = cellWidth * c.x + insets.left + hgap / 2;
float y = cellHeight * c.y + insets.right + vgap / 2;
float width, height;
if (c.handle == Handles.FILL)
{
width = (cellWidth - hgap) * c.width;
height = (cellHeight - vgap) * c.height;
}
else
{
Size d = c.component.Size;
width = d.Width;
height = d.Height;
}
switch (c.handle)
{
case Handles.TOP_CENTER:
x += (cellWidth + width) / 2;
break;
case Handles.TOP_RIGHT:
x += cellWidth - width;
break;
case Handles.CENTER_LEFT:
y += (cellHeight + height) / 2;
break;
case Handles.CENTER:
x += (cellWidth + width) / 2;
y += (cellHeight + height) / 2;
break;
case Handles.CENTER_RIGHT:
y += (cellHeight + height) / 2;
x += cellWidth - width;
break;
case Handles.BOTTOM:
y += cellHeight - height;
break;
case Handles.BOTTOM_CENTER:
x += (cellWidth + width) / 2;
y += cellHeight - height;
break;
case Handles.BOTTOM_RIGHT:
y += cellHeight - height;
x += cellWidth - width;
break;
}
c.component.Bounds = new Rectangle((int)x, (int)y, (int)width, (int)height);
}
}