shithub: libnate

ref: aab184987c79fc7a8e5467200f9ac448700b797f
dir: /n_label.c/

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

#define N_TYPE NLabel_Type
char* NLabel_Type = "NLabel";

static char*
getlabelstr(NLabel* l)
{
	if (l->labelfunc)
		return l->labelfunc();
	if (l->label)
		return l->label;
	return "";
}

static Rectangle
label_calcrect(Nelem* nelem, Image*, Rectangle r)
{
	NLabel* l = (NLabel*)nelem;
	GUARD(l);
	
	l->slot.r = r;
	return r;
}

static Point
label_desiredsize(Nelem *nelem, Image*)
{
	Point pt;
	NLabel *l = (NLabel*)nelem;
	GUARD(l);
	
	pt = stringsize(l->font, getlabelstr(l));
	pt.x += l->margin.left + l->margin.right;
	pt.y += l->margin.top + l->margin.bottom;
	return pt;
}

static void
label_draw(Nelem* nelem, Image* img)
{
	char* str;
	Rectangle r;
	Point sz, p;
	NLabel* l = (NLabel*)nelem;
	GUARD(l);
	
	str = getlabelstr(l);
	
	r = l->slot.r;
	sz = stringsize(l->font, str);
	
	// TODO: background color for text?
	draw(img, r, display->white, nil, ZP);
	
	switch (l->align) {
	case TOPLEFT:
		p.x = r.min.x + l->margin.left;
		p.y = r.min.y + l->margin.top;
		break;
	case TOP:
		p.y = r.min.y + l->margin.top;
		p.x = r.min.x + (Dx(r) - sz.x)/2;
		break;
	case TOPRIGHT:
		p.x = r.max.x - l->margin.right - sz.x;
		p.y = r.min.y + l->margin.top;
		break;
	case LEFT:
		p.x = r.min.x + l->margin.left;
		p.y = r.min.y + (Dy(r) - sz.y)/2;
		break;
	case CENTER:
		p.x = r.min.x + (Dx(r) - sz.x)/2;
		p.y = r.min.y + (Dy(r) - sz.y)/2;
		break;
	case RIGHT:
		p.x = r.max.x - l->margin.right - sz.x;
		p.y = r.min.y + (Dy(r) - sz.y)/2;
		break;
	case BOTLEFT:
		p.x = r.min.x + l->margin.left;
		p.y = r.max.y - l->margin.bottom - sz.y;
		break;
	case BOTTOM:
		p.x = r.min.x + (Dx(r) - sz.x)/2;
		p.y = r.max.y - l->margin.bottom - sz.y;
		break;
	case BOTRIGHT:
		p.x = r.max.x - l->margin.right - sz.x;
		p.y = r.max.y - l->margin.bottom - sz.y;
		break;
	}
	
	string(img, p, l->color, ZP, l->font, str);
}

static char*
label_getname(Nelem *nelem)
{
	NLabel *l = (NLabel*)nelem;
	GUARD(l);
	return getlabelstr(l);
}

static Nelemfunctions Nlabelfunctions = {
	.calcrect = label_calcrect,
	.desiredsize = label_desiredsize,
	.draw = label_draw,
	.getname = label_getname,
};

#define NTYPE NLabel
#define NACCS NLabelAccessors

DEF_ACCESSOR_OneParam(label, char*, label);
DEF_ACCESSOR_OneParam(labelfunc, StringGetter, labelfunc);
DEF_ACCESSOR_OneParam(lfont, Font*, font);
DEF_ACCESSOR_OneParam(lcolor, Image*, color);
DEF_ACCESSOR_OneParam(lmargin, Nmargin, margin);
DEF_ACCESSOR_OneParam(lalign, Nalign, align);

static NACCS accs = {
	.Label = label,
	.LabelFunc = labelfunc,
	.Font = lfont,
	.Color = lcolor,
	.Margin = lmargin,
	.Align = lalign,
};

NACCS*
New_Label(char *name)
{
	NLabel *e = MakeNelem(NLabel, NLabel_Type, &Nlabelfunctions, &accs, name, 0);
	
	e->label = nil;
	e->labelfunc = nil;
	e->font = display->defaultfont;
	e->color = display->black;
	nc_push(e);
	return &accs;
}