Implement button component

3 files changed, 139 insertions, 0 deletions

diff --git a/src/button/CMakeLists.txt b/src/button/CMakeLists.txt
new file mode 100644
index 0000000..1e6e693
--- /dev/null
+++ b/src/button/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(button "src/button.c")
+target_include_directories(button PUBLIC "inc")
+target_link_libraries(button PUBLIC gfx PRIVATE font)
diff --git a/src/button/inc/button.h b/src/button/inc/button.h
new file mode 100644
index 0000000..062cb07
--- /dev/null
+++ b/src/button/inc/button.h
@@ -0,0 +1,36 @@
+#ifndef BUTTON_H
+#define BUTTON_H
+
+#include <gfx.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+enum
+{
+    BUTTON_LEFT,
+    BUTTON_MID,
+    BUTTON_RIGHT,
+
+    MAX_BUTTON_SPRITES
+};
+
+struct button
+{
+    const char *text;
+    short x, y, w;
+};
+
+bool button_is_pressed(const struct button *b);
+int button_render(const struct button *b);
+
+extern struct sprite button_sprites[MAX_BUTTON_SPRITES];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BUTTON_H */
diff --git a/src/button/src/button.c b/src/button/src/button.c
new file mode 100644
index 0000000..9508d5c
--- /dev/null
+++ b/src/button/src/button.c
@@ -0,0 +1,100 @@
+#include <button.h>
+#include <font.h>
+#include <gfx.h>
+
+struct sprite button_sprites[MAX_BUTTON_SPRITES];
+
+bool button_is_pressed(const struct button *const b)
+{
+    return false;
+}
+
+static int render_left(const struct button *const b, short *const x)
+{
+    sprite_get_or_ret(s, -1);
+
+    if (sprite_clone(&button_sprites[BUTTON_LEFT], s))
+        return -1;
+
+    s->x = b->x;
+    s->y = b->y;
+    sprite_sort(s);
+    *x = s->x + s->w;
+    return 0;
+}
+
+static int render_mid(const struct button *const b, short *const x)
+{
+    const short mid_w = button_sprites[BUTTON_MID].w;
+    const short lw = button_sprites[BUTTON_LEFT].w;
+    const short rw = button_sprites[BUTTON_RIGHT].w;
+    const short w = b->w - lw - rw;
+
+    if (w > 0)
+    {
+        const short rem_mid = w > 0 ? w % mid_w : 0;
+        const short whole_mid = w / mid_w;
+        const short n_mid = rem_mid ? whole_mid + 1 : whole_mid;
+
+        for (struct
+            {
+                size_t i;
+                short x;
+            } a = {.i = 0, .x = lw};
+            a.i < n_mid;
+            a.i++, a.x += mid_w)
+        {
+            sprite_get_or_ret(m, -1);
+
+            if (sprite_clone(&button_sprites[BUTTON_MID], m))
+                return -1;
+
+            m->x = *x;
+            m->y = b->y;
+
+            if (rem_mid && a.i + 1 == n_mid)
+                m->w = rem_mid;
+            else
+                m->w = mid_w;
+
+            sprite_sort(m);
+            *x += m->w;
+        }
+    }
+
+    return 0;
+}
+
+static int render_right(const struct button *const b, const short *const x)
+{
+    sprite_get_or_ret(s, -1);
+
+    if (sprite_clone(&button_sprites[BUTTON_RIGHT], s))
+        return -1;
+
+    s->x = *x;
+    s->y = b->y;
+    sprite_sort(s);
+    return 0;
+}
+
+static int render_text(const struct button *const b)
+{
+    const short x = b->x + button_sprites[BUTTON_LEFT].w,
+        y = b->y + (button_sprites[BUTTON_MID].h >> 2);
+
+    return font_printf(FONT, x, y, "%s", b->text) < 0;
+}
+
+int button_render(const struct button *const b)
+{
+    short x;
+
+    if (render_left(b, &x)
+        || render_mid(b, &x)
+        || render_right(b, &x)
+        || render_text(b))
+        return -1;
+
+    return 0;
+}