void Slider::Update () {
register Perspective* p = shown;
int h, oldwidth, oldheight;
float aspect;
Scene* s;
Shape ns;
oldwidth = p->width;
oldheight = p->height;
*p = *view;
aspect = float(p->height) / float(p->width);
SizeKnob();
if (p->width != oldwidth || p->height != oldheight) {
h = Math::round(aspect * float(shape->width));
if (h == shape->height) {
Draw();
} else {
shape->height = h;
if ((s = Parent()) != nil) {
s->Change(this);
}
}
} else if (
prevl != left || prevb != bottom || prevr != right || prevt != top
) {
Draw();
}
}
void Slider::Reshape (Shape& ns) {
if (shown->width == 0) {
*shape = ns;
} else {
shape->width = (canvas == nil) ? ns.width : xmax + 1;
float aspect = float(shown->height) / float(shown->width);
int h = Math::round(aspect * float(shape->width));
if (h != shape->height) {
shape->height = h;
Scene* p = Parent();
if (p != nil) {
p->Change(this);
}
}
}
}