#include "paint.h"

Widget *
mkwidget(Rectangle r, int (*mouse)(Widget *, Mousectl *), int (*sync)(Widget *),
	void (*redraw)(Widget *, RedrawMode), Rdims (*dims)(Widget *),
	void (*resize)(Widget *, Point), void (*free)(Widget *), void *aux )
{
	Widget *w;

	if((w = malloc(sizeof(Widget))) == nil)
		return nil;	/* return the unmodified errstr */
	*w = (Widget){r, mouse, sync, redraw, dims, resize, free, aux, nil, nil, nil, nil};
	return w;
}

void
freewidget(Widget *w)
{
	Widget *c;

	for(c = w->children; c != nil; c = c->next)
		c->free(c);
	free(w);
}

void
addchildwidget(Widget *p, Widget *c, Point pos)
{
	c->next = p->children;
	p->children = c;
	c->up = p;
	movewidget(c, pos, nil);
}

void
movewidget(Widget *w, Point p, Image *screen)
{
	Point old;
	Rectangle r;
	Widget *c;

	old = w->r.min;

	r = rectsubpt(w->r, w->r.min);
	if(w->up)
		r = rectaddpt(r, w->up->r.min);
	r = rectaddpt(r, p);

	w->r = r;
	w->screen = screen;

	for(c = w->children; c != nil; c = c->next)
		movewidget(c, subpt(c->r.min, old), screen);
}

Widget *
findrootwidget(Widget *w)
{
	while(w->up != nil)
		w = w->up;
	return w;
}

int
widgetmousenop(Widget *, Mousectl *)
{
	return 0;
}

int
widgetmousedescend(Widget *w, Mousectl *mctl)
{
	int r;

	for(w = w->children; w != nil; w = w->next) {
		if(ptinrect(mctl->xy, w->r)) {
			if((r = w->mouse(w, mctl)) < 0) {
				while(ptinrect(mctl->xy, w->r))
					readmouse(mctl);
			}
			return r;
		}
	}
	while(mctl->buttons)
		readmouse(mctl);
	return 0;
}

int
widgetsyncnop(Widget *)
{
	return 0;
}

void
widgetredrawnop(Widget *, RedrawMode)
{
	return;
}

void
widgetredrawdescend(Widget *w, RedrawMode redrawmode)
{
	for(w = w->children; w != nil; w = w->next)
		w->redraw(w, redrawmode);
}

Rdims
widgetdimsnop(Widget *w)
{
	Point d;

	d = rectdim(w->r);
	return (Rdims){d, d, d};
}

Rdims
widgetdimsdescend(Widget *w)
{
	Rdims total;

	total = (Rdims){ZP, ZP, ZP};
	for(w = w->children; w != nil; w = w->next)
		total = adddims(total, w->dims(w));
	return total;
}

void
widgetresizenop(Widget *, Point)
{
}

void
widgetresizedescend(Widget *w, Point dim)
{
	Rdims d;

	for(w = w->children; w != nil; w = w->next) {
		d = w->dims(w);
		w->resize(w, clamppt(dim, Rpt(d.min, d.max)));
	}
}