Window Types

version 2004 (Modified)

You can use one of the following predefined constants to specify the type of window that you open with Open window:

Floating Windows: If you pass one of these constants to Open window, you open a regular windows. To open a floating windows, pass a negative window type value to Open window.

A modal window places the user in a state (or "mode") where they can only act within this window. As long as the modal window is displayed, the menu commands and other application windows are inaccessible. To close a modal window, the user must either validate it, cancel it, or choose one of the options it offers. Warning dialog boxes are a typical example of modal windows.

In 4D, windows of the types 1 and 5 are modal windows.

Note: A modal window always stays in the foreground. As a consequence, when a modal window calls a non-modal window, this latter window is displayed in the background, even though it was called subsequent to the modal window. You should thus avoid this type of operation.

On the other hand, when a modal window calls another modal window, this latter window will be displayed in the foreground.

The following table shows each window type, on Windows (left) and on Macintosh (right).

Plain window (8)

• Can have a title: Yes

• Can have a close box or equivalent: Yes

• Can be resized: Yes

• Can be minimized/maximized or zoomed: Yes

• Suitable for scroll bars: Yes

• Usage: data entry with scrollbars, DISPLAY SELECTION, MODIFY SELECTION, etc.

Plain no zoom box window (0)

• Can have a title: Yes

• Can have a close box or equivalent: Yes

• Can be resized: Yes

• Can be minimized/maximized or zoomed: No on Macintosh

• Suitable for scroll bars: Yes

• Usage: data entry with scrollbars, DISPLAY SELECTION, MODIFY SELECTION, etc.

Plain fixed size window (4)

• Can have a title: Yes

• Can have a close box or equivalent: Yes

• Can be resized: No on Macintosh

• Can be minimized/maximized or zoomed: No

• Suitable for scroll bars: Yes and No

• Usage: data entry with ADD RECORD(...;...*) or equivalent

Modal dialog box (1)

• Can have a title: No

• Can have a close box or equivalent: No

• Can be resized: No

• Can be minimized/maximized or zoomed: No

• Suitable for scroll bars: No

• Usage: DIALOG, ADD RECORD(...;...;*) or equivalent

• Windows of this type are modal

Alternate dialog box (3)

• Can have a title: No

• Can have a close box or equivalent: No

• Can be resized: No

• Can be minimized/maximized or zoomed: No

• Suitable for scroll bars: No

• Usage: DIALOG, ADD RECORD(...;...;*) or equivalent

• Windows of this type are modal, unless used as floating windows

Movable dialog box (5)

• Can have a title: Yes

• Can have a close box or equivalent: No

• Can be resized: No

• Can be minimized/maximized or zoomed: No

• Suitable for scroll bars: No

• Usage: DIALOG, ADD RECORD(...;...;*) or equivalent

• Windows of this type are modal, but can be moved and can be used as floating windows

Plain dialog box (2)

• Can have a title: No

• Can have a close box or equivalent: No

• Can be resized: No

• Can be minimized/maximized or zoomed: No

• Suitable for scroll bars: No

• Usage: DIALOG, ADD RECORD(...;...;*) or equivalent, splashscreens

• Windows of this type are modal, unless used as floating windows

Palette window ( 1984 {+ 1} {+ 2} {+ 4} {+ 8} )

When you call Open window, you can add one or several of the following constants to Palette window in order to obtain variations in the behavior of the window:

• Can have a title: Yes, if Has window title variation is specified

• Can have a close box or equivalent: Yes

• Can be resized: Yes, if Has grow box variation is specified

• Can be minimized/maximized or zoomed: Yes, if Has zoom box variation is specified

• Suitable for scroll bars: Yes, if Has grow box variation is specified

• Usage: Floating windows with DIALOG or DISPLAY SELECTION (no data entry)

Round corner window (16)

• Can have a title: Yes

• Can have a close box or equivalent: Yes

• Can be resized: No on Macintosh

• Can be minimized/maximized or zoomed: No

• Suitable for scroll bars: No on Macintosh

• Usage: Rare (obsolete)

Pop up window (32)

This type of window has the same basic characteristics of the Plain dialog box (2) type windows and features the following advanced specifics:

• The window is automatically closed and the "cancel" event is passed to the window when:

- a click occurs outside the window;

- the background window or the MDI (Multiple Document Interface) window is moved;

- the user clicks the Esc key.

• This window is displayed in front of its "parent" window (it must not be used as the main window of the process). The background window is not disabled. However, it no longer receives events.

• You cannot resize or move the window using the mouse; however, when performing these actions programmatically, the redraw of background items is optimized.

• Usage: This type of window is primarily used to handle pop-up menus related to 3D "bevel" or "toolbar" type buttons.

Sheet window (33) and Resizable sheet window (34)

Sheet windows are specific to Mac OS X. These windows "drop down" over the title bar of the main window using animation and are displayed above the main window. They are automatically centered in the main window. Their properties are identical to those of the modal dialog boxes. They are generally used to perform an action directly relating to the action occurring in the primary window.

• You can only create a sheet window under Mac OS X if the last open window is visible and a document type (form).

• The command opens a type 1 (Modal dialog box) window instead of a type 33 window or type 8 (Plain) window instead of type 34:

- if the last opened window is not visible or is not a document type,

- under Windows.

• Since a sheet window must be drawn above a form, its display is pushed back in the On load event of the first form loaded in the window (see example 4 of the Open window command).

• Usage: DIALOG, ADD RECORD(...;...*) or equivalent, under Mac OS (not standard under Windows).

Open external window, Open window.