Implement checkbox GUI element

res/CMakeLists.txt

@@ -208,6 +208,14 @@ sprite(NAME line_edit_right
     CY 491
     TRANSPARENT FALSE)
 
+sprite(NAME checkbox
+    X 376
+    Y 132
+    BPP 4
+    CX 368
+    CY 490
+    TRANSPARENT TRUE)
+
 sound(NAME acknowledge_01)
 sound(NAME acknowledge_02)
 sound(NAME selected_01)
@@ -218,6 +226,7 @@ container(NAME rts
         btn_left
         btn_mid
         btn_right
+        checkbox
         worker_n
         worker_ne
         worker_e

res/LICENSE

@@ -57,6 +57,8 @@ line_edit_mid.bmp:
 line_edit_mid_24.bmp:
 line_edit_right.bmp:
 line_edit_right_24.bmp:
+checkbox_24.bmp:
+checkbox.bmp:
     Derived works from ui_sheet.png
 
 font.bmp:

src/game/src/res.c

@@ -7,6 +7,7 @@
 #include <gui/button.h>
 #include <gui/line_edit.h>
 #include <gui/rounded_rect.h>
+#include <gui/checkbox.h>
 #include <resource.h>
 #include <terrain.h>
 #include <unit.h>
@@ -273,6 +274,15 @@ static const struct container c[] =
         {
             .sprite = &gui_line_edit_sprites[GUI_LINE_EDIT_RIGHT]
         }
+    },
+
+    {
+        .path = "checkbox",
+        .type = CONTAINER_TYPE_SPRITE,
+        .data =
+        {
+            .sprite = &gui_checkbox_sprite
+        }
     }
 };
 

src/gui/CMakeLists.txt

@@ -2,6 +2,7 @@ add_library(gui
     "src/bar.c"
     "src/button.c"
     "src/button_type1.c"
+    "src/checkbox.c"
     "src/container.c"
     "src/gui.c"
     "src/label.c"

src/gui/inc/gui/checkbox.h

@@ -0,0 +1,34 @@
+#ifndef GUI_CHECKBOX_H
+#define GUI_CHECKBOX_H
+
+#include <gui.h>
+#include <gfx.h>
+#include <util.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+struct gui_checkbox
+{
+    struct gui_common common;
+    bool active;
+    void *arg;
+    void (*on_pressed)(bool active, void *arg);
+};
+
+void gui_checkbox_init(struct gui_checkbox *c);
+
+extern struct sprite gui_checkbox_sprite;
+
+UTIL_STATIC_ASSERT(!offsetof(struct gui_checkbox, common),
+    "unexpected offset for struct gui_checkbox");
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GUI_CHECKBOX_H */

src/gui/src/checkbox.c

@@ -0,0 +1,71 @@
+#include <gui.h>
+#include <gui/checkbox.h>
+#include <gui_private.h>
+#include <gfx.h>
+#include <stdbool.h>
+
+struct sprite gui_checkbox_sprite;
+
+static int render(const struct gui_common *const g)
+{
+    const struct gui_checkbox *const c = (const struct gui_checkbox *)g;
+
+    sprite_get_or_ret(s, -1);
+
+    if (sprite_clone(&gui_checkbox_sprite, s))
+        return -1;
+
+    gui_coords(g, &s->x, &s->y);
+    s->w /= 2;
+
+    if (c->active)
+        s->u += s->w;
+
+    sprite_sort(s);
+    return 0;
+}
+
+static void get_dim(const struct gui_common *const g,
+    short *const w, short *const h)
+{
+    *w = gui_checkbox_sprite.w / 2;
+    *h = gui_checkbox_sprite.h;
+}
+
+static int update(struct gui_common *const g,
+    const union peripheral *const p, const struct camera *const cam,
+    struct input *const in)
+{
+    struct gui_checkbox *const c = (struct gui_checkbox *)g;
+    short w, h;
+
+    get_dim(g, &w, &h);
+
+    if (gui_pressed(g, in, p, cam, w, h))
+    {
+        c->active ^= true;
+
+        if (c->on_pressed)
+            c->on_pressed(c->active, c->arg);
+    }
+
+    return 0;
+}
+
+void gui_checkbox_init(struct gui_checkbox *const c)
+{
+    static const struct gui_common_cb cb =
+    {
+        .get_dim = get_dim,
+        .update = update,
+        .render = render
+    };
+
+    *c = (const struct gui_checkbox)
+    {
+        .common =
+        {
+            .cb = &cb
+        }
+    };
+}