- 4.8.2.24. -
Table of Contents
4. Standard Units
4.8. CRT - Keyboard and monitor control routines
4.8.2. CRT Unit Procedures and Functions
4.8.2.24. Window procedure
4.8.2.24. Window procedure
Targets: MS-DOS, OS/2, Win32 console
CRT Unit
Defines a text window on the screen.
Declaration:
procedure Window (X1, Y1, X2, Y2: Byte);
Remarks:
X1 and Y1 are the coordinates of the upper left
corner of the window, and X2 and Y2 are the coordinates
of the lower right corner. The upper left corner of the screen
corresponds to (1, 1). The minimum size of a text window is one
column by one line. If the coordinates are invalid in any way,
the call to Window is ignored.
The default window is (1, 1, 80, 25) in 25-line mode,
and (1, 1, 80, 43) in 43-line mode, corresponding to the entire screen.
All screen coordinates (except the window coordinates themselves)
are relative to the current window. For instance,
GotoXY(1, 1)
will always position the cursor in the upper left
hand corner of the current window.
Many CRT procedures and functions are window-relative,
including ClrEOL,
ClrScr,
DelLine,
GotoXY,
InsLine,
WhereX,
WhereY,
Write and
WriteLn.
WindMin and
WindMax
store the current window definition.
A call to the Window procedure always moves the cursor to (1, 1).
- 4.8.2.24. -
