add callback system to gui

engine/gf_draw_common.c

@@ -81,15 +81,23 @@ void gf_draw_reshape(gf_draw_t* draw) { gf_draw_driver_reshape(draw); }
 gf_gui_id_t button1 = -1;
 gf_gui_id_t button2 = -1;
 
+void gf_button_callback(gf_engine_t* engine, gf_draw_t* draw, gf_gui_id_t id, int type) {
+	if(type == GF_GUI_PRESS) {
+		gf_log_function(engine, "GUI component %d was pressed", id);
+	}
+}
+
 /* Runs every frame */
 void gf_draw_frame(gf_draw_t* draw) {
 	gf_graphic_color_t color;
 	color.r = color.g = color.b = color.a = 255;
 	if(button1 == -1) {
 		button1 = gf_gui_create_button(draw->gui, 0, 0, 200, 50, "\"Test\" text");
+		gf_gui_set_callback(draw->gui, button1, gf_button_callback);
 	}
 	if(button2 == -1) {
 		button2 = gf_gui_create_button(draw->gui, 100, 25, 200, 50, "\"Test\" text");
+		gf_gui_set_callback(draw->gui, button2, gf_button_callback);
 	}
 	if(draw->draw_3d) {
 		gf_graphic_draw_texture_polygon(draw, test_texture, color, GF_GRAPHIC_3D, 4,

engine/gf_gui.c

@@ -84,7 +84,9 @@ gf_gui_id_t gf_gui_create_button(gf_gui_t* gui, double x, double y, double w, do
 	c->width  = w;
 	c->height = h;
 
-	c->pressed	 = 0;
+	c->pressed  = 0;
+	c->callback = NULL;
+
 	c->u.button.text = malloc(strlen(text) + 1);
 	strcpy(c->u.button.text, text);
 	return id;
@@ -127,8 +129,12 @@ void gf_gui_render(gf_gui_t* gui) {
 		}
 	}
 	if((gui->pressed != -1) && !(input->mouse_flag & GF_INPUT_MOUSE_LEFT_MASK)) {
-		gf_log_function(gui->engine, "GUI component %d was pressed", gui->pressed);
+		if(gui->area[gui->pressed].callback != NULL) {
+			gui->area[gui->pressed].callback(gui->engine, gui->draw, gui->pressed, GF_GUI_PRESS);
+		}
 		gui->area[gui->pressed].pressed = 1;
 		gui->pressed			= -1;
 	}
 }
+
+void gf_gui_set_callback(gf_gui_t* gui, gf_gui_id_t id, gf_gui_callback_t callback) { gui->area[id].callback = callback; }

engine/include/gf_gui.h

@@ -74,7 +74,7 @@ GF_EXPORT void gf_gui_render(gf_gui_t* gui);
  * @param id Component ID to be returned
  * @return Pointer to component
  */
-gf_gui_component_t* gf_gui_first_unused(gf_gui_t* gui, gf_gui_id_t* id);
+GF_EXPORT gf_gui_component_t* gf_gui_first_unused(gf_gui_t* gui, gf_gui_id_t* id);
 
 /**
  * @~english
@@ -88,4 +88,13 @@ gf_gui_component_t* gf_gui_first_unused(gf_gui_t* gui, gf_gui_id_t* id);
  */
 GF_EXPORT void gf_gui_draw_box(gf_gui_t* gui, int mul, double x, double y, double w, double h);
 
+/**
+ * @~english
+ * @brief Set callback
+ * @param gui GUI
+ * @param id Component ID
+ * @param callback Callback
+ */
+GF_EXPORT void gf_gui_set_callback(gf_gui_t* gui, gf_gui_id_t id, gf_gui_callback_t callback);
+
 #endif

engine/include/gf_type/gui.h

@@ -16,6 +16,14 @@
  */
 typedef int gf_gui_id_t;
 
+/**
+ * @~english
+ * @brief GUI events
+ */
+enum GF_GUI_EVENTS {
+	GF_GUI_PRESS = 0
+};
+
 #ifdef GF_EXPOSE_GUI
 typedef struct gf_gui_button_t gf_gui_button_t;
 
@@ -31,6 +39,8 @@ typedef union gf_gui_union_t	  gf_gui_union_t;
 
 /* Standard */
 
+typedef void (*gf_gui_callback_t)(gf_engine_t* engine, gf_draw_t* draw, gf_gui_id_t id, int type);
+
 /**
  * @~english
  * @brief Max components engine GUI can handle
@@ -89,20 +99,24 @@ typedef union gf_gui_union_t {
  * @var gf_gui_component_t::height
  * @brief Height of component
  *
- * @var gf_gui_component_t::u
- * @brief Component union
- *
  * @var gf_gui_component_t::pressed
  * @brief `1` if pressed, otherwise `0`
+ *
+ * @var gf_gui_component_t::callback
+ * @brief Event callback
+ *
+ * @var gf_gui_component_t::u
+ * @brief Component union
  */
 GF_DECLARE_TYPE(gui_component, {
-	int	       type;
-	double	       x;
-	double	       y;
-	double	       width;
-	double	       height;
-	int	       pressed;
-	gf_gui_union_t u;
+	int		  type;
+	double		  x;
+	double		  y;
+	double		  width;
+	double		  height;
+	int		  pressed;
+	gf_gui_callback_t callback;
+	gf_gui_union_t	  u;
 });
 
 /**
@@ -129,6 +143,8 @@ GF_DECLARE_TYPE(gui, {
 	gf_gui_component_t area[GF_GUI_MAX_COMPONENTS];
 });
 #else
+typedef void* gf_gui_callback_t;
+
 typedef void gf_gui_button_t;
 
 typedef void gf_gui_t;