8.13 Scrolling

int scrollok(win, bf)
If TRUE, the text in the window win will be scrolled up one line when the cursor is on the lower right corner and a character is typed (or newline). If FALSE, the cursor is left in the same position.
When turned on the contents of a window can be scrolled with the following functions. (Note: It would be also scrolled, if you print a new line in the last line of the window. So, be careful with scrollok(...) or you will get unreasonable results.)
int scroll(win)
This function will scroll up the window (and the lines in the data structure) one line.
int scrl(n)
int wscrl(win, n)
These functions will scroll the window or win up or down depending on the value of the integer n. If n is positive the window will be scrolled up n lines, otherwise if n is negative the window will be scrolled down n lines.
int setscrreg(t, b)
int wsetscrreg(win, t, b)
Set a software scrolling region.

The following code should explain how to get the effect of scrolling a text on the screen. Look also in .c in the example directory.

We have a window with 18 lines and 66 columns and want to scroll a text in it. S[] is a character array with the text. Max_s is the number of the last line in s[]. Clear_line will print blank characters from the current cursor position up to the end of the line using the current attributes from the window (not A_NORMAL as clrtoeol does). Beg is the last line from s[] currently shown on the screen. Scroll is an enumerate to tell the function what to do, show the NEXT or PREVious line from the text.

Next: 8.14 Pads Up: 8 Character Cell Graphics Previous: 8.12 Cursor and Window

Converted on:
Fri Mar 29 14:43:04 EST 1996

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