shithub: libnate

ref: 69e287559e1faed50092d64659c5bc02f9bf395c
dir: /n_box.c/

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#include "nate_construct.h"
#include "n_box.h"

#define N_TYPE NBox_Type
char* NBox_Type = "NBox";

static Rectangle
box_calcrect(Nelem* nelem, Image* screen, Rectangle r)
{
	Rectangle cr;
	NBox* b = (NBox*)nelem;
	GUARD(b);
	
	if (!b->autosize && b->size.x >= 0 && b->size.y >= 0)
		r.max = addpt(r.min, b->size);
	
	Nelem *child = lgetfirst(&b->children);
	if (child) {
		if (b->autosize)
			r.max = addpt(r.min, ncalldesiredsize(child, screen));
		
		/* tell child its size (important!) */
		cr = insetrect(r, b->borderwidth);
		ncallcalcrect(child, screen, cr);
	}
	b->slot.r = r;
	return b->slot.r;
}

static Point
box_desiredsize(Nelem *nelem, Image *screen)
{
	Point pt;
	NBox *b = (NBox*)nelem;
	GUARD(b);
	
	if (b->autosize) {
		Nelem *child = lgetfirst(&b->children);
		if (child)
			pt = ncalldesiredsize(child, screen);
		pt.x += 2*b->borderwidth;
		pt.y += 2*b->borderwidth;
		return pt;
	}
	if (b->size.x < 0 || b->size.y < 0)
		sysfatal("error: box size < 0: %s %s", b->type, b->name);
	
	return b->size;
}

static void
box_draw(Nelem* nelem, Image* img)
{
	Nelem* f;
	Rectangle r;
	NBox* b = (NBox*)nelem;
	GUARD(b);
	f = lgetfirst(&b->children);
	if (!f)
		return;

	r = b->slot.r;

	if (b->borderwidth > 0)
		border(img, r, b->borderwidth, b->bordercolor, ZP);
	ncalldraw(f, img);
}

static Nelem*
box_checkhit(Nelem *nelem, Image *screen, Mouse m)
{
	NBox *b = (NBox*)nelem;
	GUARD(b);
	
	if (!b->hitfunc)
		return nd_checkhit(nelem, screen, m);
	
	if (ptinrect(m.xy, b->slot.r))
		return b;
	return nil;
}

static int
box_hit(Nelem* nelem, Mouse m)
{
	NBox* b = (NBox*)nelem;
	GUARD(b);
	int b1 = m.buttons&1;
	
	// TODO: behaviour when pressed down and releasing on another box?
	// TODO:   drag-and-drop?
	
	if (b->ishit == b1) {
		/* no state change */
		return 0;
	}
	if (b->ishit && !b1) {
		/* released */
		b->ishit = 0;
		return 0;
	}
	if (!b->ishit && b1) {
		/* pressed */
		b->ishit = 1;
		if (b->hitfunc)
			return b->hitfunc(m, b, b->hitaux);
		return 0;
	}
	/* cannot happen */
	assert(0);
	return 1;
}

static char*
box_getname(Nelem *nelem)
{
	Nelem *ch;
	NBox *b = (NBox*)nelem;
	GUARD(b);
	ch = lgetfirst(&b->children);
	if (!(ch && ch->funcs && ch->funcs->getname))
		return b->name;
	return ch->funcs->getname(ch);
}

static Nelemfunctions Nboxfunctions = {
	.calcrect = box_calcrect,
	.desiredsize = box_desiredsize,
	.draw = box_draw,
	.checkhit = box_checkhit,
	.hit = box_hit,
	.getname = box_getname,
};

DEF_SLOTFUNC(NBox, box_slot);

DEF_ACCESSOR_TwoParams(NBox, box_border, int, borderwidth, Image*, bordercolor);
DEF_ACCESSOR_OneParam(NBox, box_autosize, int, autosize);
DEF_ACCESSOR_OneParam(NBox, box_size, Point, size);
DEF_ACCESSOR_OneParam(NBox, box_padding, Nmargin, padding);
DEF_ACCESSOR_TwoParams(NBox, box_onclick, OnclickHandler, hitfunc, void*, hitaux);

NBox*
New_Box(char *name)
{
	NBox *b = MakeNelem(NBox, NBox_Type, &Nboxfunctions, name, 1);
	
	b->Slot = box_slot;
	b->Border = box_border;
	b->AutoSize = box_autosize;
	b->Size = box_size;
	b->OnClick = box_onclick;
	b->Padding = box_padding;
	
	b->autosize = 0;
	b->size = Pt(-1, -1);
	b->hitfunc = nil;
	b->hitaux = nil;
	b->borderwidth = 0;
	b->bordercolor = display->black;
	nc_push(b);
	return b;
}