term% cat index.txt BUTTON(9.2) BUTTON(9.2)
NAME
button123, mouse, cursallow, cursinhibit, cursset, cursswitch, ge‐
trect123 - mouse control
SYNOPSIS
#include <jerq.h>
extern struct Mouse {
Point xy;
short buttons;
} mouse;
int button(n) int n;
int button1(), button2(), button3();
int button12(), button23(), button123();
void cursinhibit();
void cursallow();
void cursset(p); Point p;
Texture *cursswitch(t); Texture *t;
Rectangle getrect(n) int n;
Rectangle getrect1(), getrect2(), getrect3();
Rectangle getrect12(), getrect23(), getrect123();
DESCRIPTION
For processes that request the mouse (see request(9.2)), the mouse
state is updated asynchronously in the per-process structure mouse.
The coordinates of the mouse are held in mouse.xy, and the state of the
buttons in mouse.buttons. Each process's mouse structure is indepen‐
dent of the others, so that (except for cursset) actions such as chang‐
ing the tracking cursor do not affect other process's use of the mouse.
Mouse is not updated if the process does not `own' the mouse; see re‐
quest(9.2).
The macro button and its counterparts return the state of the associ‐
ated mouse button: non-zero if the button is depressed, 0 otherwise.
The buttons are numbered 1 to 3 from left to right. Button12 and the
other multi-button functions return the OR of their states: true if ei‐
ther button 1 or button 2 is depressed (as opposed to button 1 and but‐
ton 2).
Cursinhibit turns off interrupt-time cursor tracking (the drawing of
the cursor on the screen), although the mouse coordinates are still
kept current and available. Cursallow enables interrupt-time cursor
tracking. Cursallow and cursinhibit stack: to enable cursor tracking
after two calls to cursinhibit, two calls to cursallow are required.
Cursset moves the mouse cursor to the Point p.
Cursswitch changes the mouse cursor (a 16×16 pixel image) to that spec‐
ified by the Texture *t. If the argument is (Texture *)0, the cursor
is restored to the default arrow. Cursswitch returns the previous
value of the cursor: the argument of the previous call to cursswitch.
Getrect prompts the user with a box cursor and waits for a rectangle to
be swept out named button, identified as with the button primitives.
It returns the screen coordinates of the box swept. The box may be
partly or wholly outside the process's layer.
BUTTON(9.2)