1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
// Feed pointer state once per event-loop iteration. Activate on release inside,
// only after a press that began inside. No native/window dependency.
struct Button {
int x, y, width, height;
u8[~] !label;
bool !enabled = true, !hovered = false, !pressed = false;
bool !_held = false, !_armed = false;
new Button = { int px, int py, int w, int h, u8[~] text ->
x = px; y = py; width = w; height = h; label = text;
};
val contains = { i64 px, i64 py ->
if( width <= 0 || height <= 0 ) return false;
i64 right = x, bottom = y; right += width; bottom += height;
if( px < x || py < y || px >= right || py >= bottom ) return false;
return true;
};
val update = { i64 px, i64 py, bool down ->
hovered = false;
if( enabled ) hovered = contains(px,py);
if( !enabled ) _armed = false;
if( down && !_held ) _armed = hovered;
var clicked = false;
if( !down ) if( _held ) if( _armed ) if( hovered ) clicked = true;
if( !down ) _armed = false;
_held = down;
pressed = false;
if( down ) if( _armed ) if( hovered ) pressed = true;
return clicked;
};
val draw = { !sys.draw.Canvas screen, int scale, u32 foreground, u32 background, u32 active ->
screen.fillRect(x,y,width,height,enabled && (hovered || pressed) ? active : background);
screen.rect(x,y,width,height,2,enabled ? foreground : active);
if( scale > 0 ) {
i64 textWidth = label#; textWidth = (textWidth*4-1)*scale;
if( textWidth <= width-8 && 5*scale <= height-8 )
screen.text(x+(width-textWidth)/2,y+(height-5*scale)/2+(pressed ? 1 : 0),
label,scale,enabled ? foreground : active);
}
return self;
};
};
|
