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/*
* Copyright (C) 2021 P. J. McDermott
*
* This file is part of Maze Fight
*
* Maze Fight is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Maze Fight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Maze Fight. If not, see <http://www.gnu.org/licenses/>.
*/
#include <SDL.h>
#include <SDL_ttf.h>
#include <errno.h>
#include <string.h>
#include "../tk.h"
#include "../util.h"
#include "widget.h"
struct mftk_text {
struct mftk_widget parent;
char min_char;
char max_char;
size_t len;
size_t cur;
int y;
int w;
int h;
char *val;
TTF_Font *font;
int line_skip;
int ascent;
SDL_Color *color;
SDL_Texture *texture;
};
static void
_mftk_text_layout(struct mftk_widget *w __attribute__((__unused__)))
{
/* Size set in constructor */
}
static int
_mftk_text_key_event(struct mftk_widget *w, SDL_Event *e)
{
struct mftk_text *t = (struct mftk_text *) w;
switch (e->type) {
case SDL_KEYDOWN:
/* TODO */
t->texture = NULL;
break;
default:
break;
}
return 0;
}
static int
_mftk_text_mouse_event(struct mftk_widget *w, SDL_Event *e,
int x __attribute__((__unused__)),
int y __attribute__((__unused__)))
{
switch (e->type) {
case SDL_MOUSEBUTTONUP:
if (e->button.button == SDL_BUTTON_LEFT) {
mftk_window_focus(w->window, w);
}
break;
default:
break;
}
return 0;
}
static int
_mftk_text_render_val(struct mftk_text *t, SDL_Renderer *renderer)
{
SDL_Surface *surface;
int max_y;
const char *c;
int glyph_max_y;
surface = TTF_RenderUTF8_Blended(t->font, t->val, *t->color);
if (surface == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't create surface: %s",
TTF_GetError());
return -1;
}
t->texture = SDL_CreateTextureFromSurface(renderer, surface);
if (t->texture == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't create texture: %s",
SDL_GetError());
SDL_FreeSurface(surface);
return -1;
}
max_y = 0;
for (c = t->val; *c != '\0'; ++c) {
if (TTF_GlyphMetrics(t->font, *c, NULL, NULL, NULL,
&glyph_max_y, NULL) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't get glyph metrics: %s",
TTF_GetError());
continue;
}
if (glyph_max_y > max_y) {
max_y = glyph_max_y;
}
}
t->y = (t->line_skip - t->ascent) / 2 + (t->ascent - max_y);
t->w = surface->w;
t->h = surface->h;
SDL_FreeSurface(surface);
return 0;
}
static int
_mftk_text_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
{
struct mftk_text *t = (struct mftk_text *) w;
SDL_Rect rect;
char *val;
int cur_x;
if (t->texture == NULL && _mftk_text_render_val(t, renderer) < 0) {
return -1;
}
rect.x = x;
rect.y = t->y + y;
rect.w = t->w;
rect.h = t->h;
val = mf_strdup(t->val);
if (val == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't render widget: %s",
strerror(errno));
return -1;
}
val[t->cur] = '\0';
TTF_SizeUTF8(t->font, val, &cur_x, NULL);
if (SDL_RenderCopy(renderer, t->texture, NULL, &rect) < 0 ||
SDL_SetRenderDrawColor(renderer,
t->color->r, t->color->g,
t->color->b, t->color->a) < 0 ||
SDL_RenderDrawLine(renderer,
x, y + w->h, x + w->w, y + w->h) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't render widget: %s",
SDL_GetError());
free(val);
return -1;
}
if (w->focused == SDL_TRUE && SDL_RenderDrawLine(renderer,
x + cur_x, y + t->y, x + cur_x, y + t->h) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't render widget: %s",
SDL_GetError());
free(val);
return -1;
}
free(val);
return 0;
}
static void
_mftk_text_destroy(struct mftk_widget *w)
{
struct mftk_text *t = (struct mftk_text *) w;
free(t->val);
SDL_DestroyTexture(t->texture);
}
struct mftk_widget *
mftk_text_new(char min_char, char max_char, size_t len, const char *val,
TTF_Font *font, SDL_Color *color)
{
struct mftk_widget *w;
struct mftk_text *t;
int advance;
char ch;
mftk_widget_init_focusable(w, t, text);
t->min_char = min_char;
t->max_char = max_char;
t->len = len;
t->cur = strlen(val);
t->val = mf_strdup(val);
t->font = font;
t->line_skip = TTF_FontLineSkip(font);
t->ascent = TTF_FontAscent (font);
t->color = color;
t->texture = NULL;
w->w = 0;
for (ch = min_char; ch <= max_char; ++ch) {
if (TTF_GlyphMetrics(font, ch, NULL, NULL, NULL, NULL, &advance)
< 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't get glyph metrics: %s",
TTF_GetError());
continue;
}
advance *= len;
if (advance > w->w) {
w->w = advance;
}
}
w->h = t->line_skip + 1;
return w;
}
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