Removing Windows, Using the Screen Manager

DEC Text Processing Utility Data Types

3.14 Window Data Type

For more information on the cursor position in a window and the POSITION built-in procedure, see the DEC Text Processing Utility Reference Manual.

3.14.5 Removing Windows

To remove a window from the screen, you can use either the UNMAP built-in procedure or the DELETE built-in procedure. UNMAP removes a window from the screen. However, the window is still in DECTPU’s internal list of windows. It is available to be remapped to the screen without being re-created. DELETE removes a window from the screen and also removes it from DECTPU’s list of windows. It is then no longer available for future mapping to the screen.

Unmapping or deleting a window has the following effects:

•The unmapped window is marked as not visible and not mapped.

•Another window becomes the current window and the cursor is moved to the last cursor position in that window.

•If other windows were occluded by the window you removed from the screen, text from the occluded windows reappears on the screen. The visible_top, visible_bottom, and visible_length values of the previously occluded windows are modiﬁed according to the lines that are returned to them when the occluding window is unmapped. When an occluding window is removed, the window or windows it occluded become visible again.

3.14.6Using the Screen Manager

The screen manager is the part of DECTPU that controls the display of data on the screen. You can manipulate data without having it appear on a terminal screen (see Chapter 5). However, if you use the DECTPU window capability to make your edits visible, the screen manager controls the screen.

In the main control loop of DECTPU, the screen manager is not called to perform its duties until all commands bound to the last key pressed have ﬁnished executing and all input in the type-ahead buffer has been processed. Upon completion of all the commands, the screen manager updates every window to reﬂect the current state of the part of the buffer that is visible in the window.

If you want to make the screen reﬂect changes to the buffer prior to the end of a procedure, use the UPDATE built-in procedure to force the updating of the window. Using UPDATE is recommended with built-in procedures such as CURRENT_COLUMN that query DECTPU for the current cursor position. To ensure that the cursor position returned is the correct location (up to the point of the most recently issued command), use UPDATE before using CURRENT_ COLUMN or CURRENT_ROW.

3.14.7 Getting Information on Windows

There are two DECTPU built-in procedures that return information about windows: GET_INFO and SHOW (WINDOW).

GET_INFO returns information that you can store in a variable. You can get information about the visible and original values of windows, as well as about other attributes that you have set up for your window environment. See GET_ INFO in the DEC Text Processing Utility Reference Manual.

SHOW (WINDOW) or SHOW (WINDOWS) puts information about windows in the SHOW_BUFFER. If you use an editor that has an INFO_WINDOW, you can display the SHOW_BUFFER information in the INFO_WINDOW.

DEC Text Processing Utility Data Types 3–25

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