Position of Forms on the Screen

Mostly forms are automatically positioned by the system according to their type and the way they are shown.

The origin of a form is its top left hand corner.

When a form is displayed as a child form then it is always positioned with respect to its parent.

For a form shown from a MENU, its origin is at the origin of the parent. If the form is displayed from a BUTTON or any other gadget, its origin is at the center of the gadget.

When a form is shown as a free form for the first time then its default position is at the top left-hand corner of the screen.

Note:
It is strongly recommended that you allow the system to position forms whenever possible.

You can force the screen position of free-standing forms using the following commands or methods:

show !!MyForm Free At xr 0.3 yr 0.5

show !!MyForm Free centered xr 0.5 yr 0.5

!!MyForm.show( 'At', 0.3, 0.5 )

!!MyForm.show( 'Cen', 0.5, 0.5 )

The At option puts the origin of the form at the specified position; alternatively the Cen option puts the center of the form at the given position. The co-ordinate values are fractions of the screen width or height respectively and are referred to as screen co-ordinates.

For example:

show !!MyForm free At xr 0.25 yr 0.1

This positions the origin of !!MyForm one quarter of the way across from the left edge of the screen, and one-tenth of the way down from the top.

!!MyForm.show( 'Cen', 0.5, 0.5 )

This centers !!MyForm at the middle of the screen.