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#include "gui.h"
#include "memory.h"
#include "plat.h"
#include "render.h"
#include "standard.h"
void* gui_alloc(GUI* g, int size) {
GUI_El* e = arena_alloc(g->a, size);
if (g->prev)
g->prev->next = e;
if (!g->first)
g->first = e;
g->prev = e;
e->next = 0;
return e;
}
void gui_begin(GUI* g, const App* app, Arena* a) {
g->a = a;
g->app = app;
g->pad = 2;
g->first = 0;
g->cursor[0] = 10;
g->cursor[1] = 10;
}
void gui_get_layout(GUI* g, Rect* r) {
r->x = g->cursor[0];
r->y = g->cursor[1];
g->cursor[1] += r->h;
}
int gui_text_width(const char* text, int len) {
(void)text;
return len * 10;
}
int gui_text_height(void) {
return 10;
}
int mouse_over(const App* app, const Rect* r) {
return
app->mx > r->x &&
app->my > r->y &&
app->mx < r->x + r->w &&
app->my < r->y + r->h;
}
Rect gui_viewport(GUI* g) {
Rect r = { 0 };
r.w = g->app->w;
r.h = g->app->h;
return r;
}
Rect gui_cut_left(Rect* a, int v) {
Rect r = * a;
a->x += v;
a->w -= v;
r.w -= a->w;
return r;
}
Rect gui_cut_right(Rect* a, int v) {
Rect r = *a;
a->w -= v;
r.x += v;
r.w -= v;
return r;
}
Rect gui_cut_down(Rect* a, int v) {
Rect r = *a;
a->h -= v;
r.y += v;
r.h -= v;
return r;
}
Rect gui_cut_up(Rect* a, int v) {
Rect r = * a;
a->y += v;
a->h -= v;
r.h -= a->h;
return r;
}
int gui_btn(GUI* g, Rect r, const char* text) {
int len = string_len(text);
GUI_Btn* e = gui_alloc(g, sizeof *e);
e->el.type = gui_el_type_btn;
e->el.r = r;
e->text = arena_alloc_aligned(g->a, len + 1, 1);
string_copy(e->text, text);
e->hover = mouse_over(g->app, &e->el.r);
e->active = e->hover &&
g->app->mbtn_states[mbtn_left] & key_state_pressed;
return e->hover &&
g->app->mbtn_states[mbtn_left] & key_state_just_released;
}
void gui_scrollable(
GUI* g,
Rect r,
GUI_Scroll_State* state,
GUI_Scrollable_Draw_Fn fn
) {
GUI_Scrollable* e = gui_alloc(g, sizeof *e);
e->el.type = gui_el_type_scrollable;
e->el.r = r;
e->ss = state;
e->draw = fn;
}
void rect_cfit(Rect* r) {
r->x++;
r->y++;
r->w -= 2;
r->h -= 2;
}
void draw_container(Renderer* r, const Rect* rect, int active) {
const Colour bg = make_colour(0xc3c3c3, 0xff);
Colour out1 = make_colour(0xffffff, 0xff);
Colour out2 = make_colour(0x000000, 0xff);
Rect t = *rect;
if (active) {
Colour t = out1;
out1 = out2;
out2 = t;
}
ren_rect(r, bg, rect);
t.h = 1;
ren_rect(r, out1, &t);
t.w = 1;
t.h = rect->h;
ren_rect(r, out1, &t);
t.h--;
t.x += rect->w - 1;
t.y++;
ren_rect(r, out2, &t);
t.y = rect->y + rect->h - 1;
t.x = rect->x + 1;
t.w = rect->w - 1;
t.h = 1;
ren_rect(r, out2, &t);
}
void draw_btn(GUI* g, Renderer* r, const GUI_Btn* btn) {
const Colour txt = make_colour(0x000000, 0xff);
int tp[2];
Rect rect = btn->el.r;
(void)g;
tp[0] =
rect.x + rect.w / 2 -
gui_text_width(btn->text, string_len(btn->text)) / 2;
tp[1] =
rect.y + rect.h / 2 -
gui_text_height() / 2;
if (btn->active) {
tp[0]++;
tp[1]++;
}
draw_container(r, &rect, btn->active);
rect_cfit(&rect);
ren_clip(r, &rect);
ren_text(r, txt, tp[0], tp[1], btn->text);
ren_clipr(r);
}
void draw_scrollable(
GUI* g,
Renderer* r,
const GUI_Scrollable* s
) {
Rect rect = s->el.r;
draw_container(r, &s->el.r, 0);
rect_cfit(&rect);
ren_clip(r, &rect);
s->draw(g, r, &rect, s->ss);
ren_clipr(r);
}
void gui_end(GUI* g, Renderer* r) {
GUI_El* el = g->first;
while (el) {
switch (el->type) {
case gui_el_type_btn:
draw_btn(g, r, (GUI_Btn*)el);
break;
case gui_el_type_scrollable:
draw_scrollable(g, r, (GUI_Scrollable*)el);
break;
}
el = el->next;
}
}
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