Tooltip rendering

game/Makefile

@@ -1,3 +1,5 @@
+# To launch with debug messages: G_MESSAGES_DEBUG=all ./wschod
+
 SRC := $(shell find src -name '*.c')
 OBJ := $(patsubst src/%.c, build/%.o, $(SRC))
 DEP := $(OBJ:.o=.d)

game/src/ui/uiman.c

@@ -18,14 +18,28 @@ static Widget *hovered_widget = NULL;
 static Widget *clicked_widget = NULL;
 static Widget *focused_widget = NULL;
 
+static Widget *tooltip_widget = NULL;
+static Widget *tooltip_text = NULL;
+
+const char *lorem_ipsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
 void
 uiman_init ()
 {
-  ui_root = Widget_plain_new ();
-  VEC2_SETI (ui_root->size, sdl_window_w, sdl_window_h);
   ui_widget_mesh_init ();
   glm_ortho (0.0, (float) sdl_window_w, (float) sdl_window_h, 0.0, -1.0, 1.0, projection);
 
+  tooltip_widget = Widget_flowbox_new (TRUE);
+  tooltip_widget->visible = FALSE;
+  tooltip_widget->size[0] = 200;
+  tooltip_widget->style->layout_padding = 4;
+  tooltip_widget->style->background_image = RESTEX ("terrain4");
+  tooltip_text = Widget_multiline_text_new (NULL, 20, TEXT_ALIGN_CENTER);
+  Widget_add_child_flowbox (tooltip_widget, tooltip_text, 1, 0);
+  
+  ui_root = Widget_plain_new ();
+  VEC2_SETI (ui_root->size, sdl_window_w, sdl_window_h);
+
   Widget *debug_menu = Widget_flowbox_new (TRUE);
   debug_menu->style->layout_padding = 8;
   debug_menu->style->background_image = RESTEX ("terrain4");
@@ -40,12 +54,16 @@ uiman_init ()
   Widget_add_child_flowbox (debug_menu, Widget_label_make_float ("Y: %.1f", &camera_position[1], TEXT_ALIGN_CENTER), 1./3., 20);
   Widget_add_child_flowbox (debug_menu, Widget_label_make_float ("Z: %.1f", &camera_position[2], TEXT_ALIGN_RIGHT), 1./3., 20);
 
-  Widget_add_child_flowbox (debug_menu, Widget_composite_spinner_make_int ("Render distance: %d", &render_distance), 1, 20);
+  Widget *spinner = Widget_composite_spinner_make_int ("Render distance: %d", &render_distance);
+  spinner->tooltip = g_string_new (lorem_ipsum);
+  Widget_add_child_flowbox (debug_menu, spinner, 1, 20);
   
   Widget_add_child_flowbox (debug_menu, Widget_composite_checkbox_make ("Wireframe", "wireframe_enabled"), 1./2., 20);
   Widget_add_child_flowbox (debug_menu, Widget_composite_checkbox_make ("Flight", "flight_enabled"), 1./2., 20);
 
   Widget_add_child (ui_root, debug_menu);
+
+  Widget_dump (ui_root, 0);
 }
 
 void
@@ -58,6 +76,7 @@ void
 uiman_render ()
 {
   Widget_render (ui_root, projection, sdl_window_h);
+  Widget_render (tooltip_widget, projection, sdl_window_h);
 }
 
 void
@@ -121,6 +140,8 @@ uiman_cb_switch_focus (SDL_Event *event, void *data)
   _uiman_set_clicked (clicked_widget, FALSE);
   clicked_widget = NULL;
   
+  tooltip_widget->visible = FALSE;
+  
   return TRUE;
 }
 
@@ -164,8 +185,9 @@ gboolean
 uiman_cb_mouse_motion (SDL_Event *event, void *data)
 {
   UNUSED (event, data);
-
-  Widget *new_hover = Widget_find_xy (ui_root, (vec2) { event->motion.x, event->motion.y });
+  vec2 pos = { event->motion.x, event->motion.y };
+  
+  Widget *new_hover = Widget_find_xy_cond (ui_root, pos, wcond_any, NULL);
 
   if (new_hover != hovered_widget)
     {
@@ -180,6 +202,19 @@ uiman_cb_mouse_motion (SDL_Event *event, void *data)
   /* Even if it isn't the hovered widget, this is useful for stuff
      like scrollbars. */
   _uiman_call_on_event (clicked_widget, event, EVENT_MOUSE_MOVE);
+
+  Widget *tooltip_source = Widget_find_xy_cond (ui_root, pos, wcond_tooltip, NULL);
+
+  if (tooltip_source && tooltip_source->tooltip && tooltip_source->tooltip->len > 0)
+    {
+      Widget_multiline_text_set_text (tooltip_text, tooltip_source->tooltip->str);
+      tooltip_widget->visible = TRUE;
+      VEC2_SETI (tooltip_widget->position, pos[0] + 12, pos[1] + 12);
+    }
+  else
+    {
+      tooltip_widget->visible = FALSE;
+    }
   
   /* This callback always eats the event, because why would the game
      need mouse motion if the UI has stolen the focus? */
@@ -192,7 +227,7 @@ uiman_cb_button_down (SDL_Event *event, void *data)
   UNUSED (data);
 
   WidgetEvent e = event->button.button == SDL_BUTTON_LEFT ? EVENT_LEFT_DOWN : EVENT_RIGHT_DOWN;
-  Widget *widget = Widget_find_xy (ui_root, (vec2) { event->button.x, event->button.y });
+  Widget *widget = Widget_find_xy_cond (ui_root, (vec2) { event->button.x, event->button.y }, wcond_any, NULL);
 
   _uiman_set_clicked (widget, TRUE);
   clicked_widget = widget;
@@ -227,7 +262,7 @@ uiman_cb_mouse_wheel (SDL_Event *event, void *data)
   UNUSED (event, data);
 
   WidgetEvent e = event->wheel.y > 0 ? EVENT_SCROLL_UP : EVENT_SCROLL_DOWN;
-  Widget *widget = Widget_find_xy_event (ui_root, (vec2) { event->wheel.mouse_x, event->wheel.mouse_y }, e);
+  Widget *widget = Widget_find_xy_cond (ui_root, (vec2) { event->wheel.mouse_x, event->wheel.mouse_y }, wcond_event, GINT_TO_POINTER (e));
   return _uiman_call_on_event (widget, event, e);
 }
 

game/src/ui/widget_core.c

@@ -236,6 +236,13 @@ Widget_label_printf (Widget *widget, const char *format, ...)
   va_end (args);
 }
 
+void
+Widget_multiline_text_set_text (Widget *widget, const char *text)
+{
+  g_string_overwrite (widget->multiline_text.text, 0, text);
+  widget->layout_dirty = TRUE;
+}
+
 void
 Widget_entry_input_text (Widget *widget, const char *text)
 {
@@ -274,8 +281,29 @@ Widget_hit_test (Widget *widget, vec2 point)
 	  && y >= top && y <= bottom);
 }
 
+gboolean
+wcond_tooltip (Widget *widget, void *userdata)
+{
+  UNUSED (userdata);
+  return widget->tooltip != NULL;
+}
+
+gboolean
+wcond_event (Widget *widget, void *event)
+{
+  WidgetEvent e = GPOINTER_TO_INT (event);
+  return widget->on_event[e] != NULL;
+}
+
+gboolean
+wcond_any (Widget *widget, void *userdata)
+{
+  UNUSED (widget, userdata);
+  return TRUE;
+}
+
 Widget *
-Widget_find_xy_event (Widget *widget, vec2 pos, WidgetEvent event)
+Widget_find_xy_cond (Widget *widget, vec2 pos, gboolean (*cond_func) (Widget *, void *), void *userdata)
 {
   if (!widget->visible)
     {
@@ -298,7 +326,7 @@ Widget_find_xy_event (Widget *widget, vec2 pos, WidgetEvent event)
   for (int i = widget->children->len - 1; i >= 0; --i)
     {
       Widget *child = g_array_index (widget->children, Widget *, i);
-      Widget *found = Widget_find_xy_event (child, pos_scrolled, event);
+      Widget *found = Widget_find_xy_cond (child, pos_scrolled, cond_func, userdata);
       
       if (found != NULL)
 	{
@@ -306,18 +334,12 @@ Widget_find_xy_event (Widget *widget, vec2 pos, WidgetEvent event)
 	}
     }
 
-  if (event == EVENT_NONE || widget->on_event[event])
+  if (cond_func (widget, userdata))
     {
       return widget;
     }
 
-  return NULL;
-}
-
-Widget *
-Widget_find_xy (Widget *widget, vec2 pos)
-{
-  return Widget_find_xy_event (widget, pos, EVENT_NONE);
+  return NULL;  
 }
 
 void
@@ -343,6 +365,14 @@ Widget_render (Widget *widget, mat4 projection, int window_height)
       widget->do_layout (widget);
     }
 
+  if (!widget->visible)
+    {
+      /* If the children need layouting, it doesn't matter, as we're
+	 not visible anyway. They'll layout when the widget becomes
+	 visible again. */
+      return;
+    }
+  
   if (widget->do_render)
     {
       widget->do_render (widget, projection, window_height);
@@ -386,3 +416,31 @@ Widget_free (Widget *widget)
 
   g_free (widget);
 }
+
+void
+Widget_dump (Widget *widget, int depth)
+{
+  if (!widget) return;
+
+  GString *prefix = g_string_new (NULL);
+  for (int i = 0; i < depth; ++i)
+    {
+      g_string_append (prefix, " ");
+    }
+  
+  g_debug ("%sWidget %p kind=%d visible=%d", prefix->str, widget, widget->kind, widget->visible);
+
+  for (int i = 0; i < EVENT_COUNT; ++i)
+    {
+      if (widget->on_event[i])
+        {
+          g_debug ("%s  Has handler for event %d", prefix->str, i);
+        }
+    }
+
+  for (unsigned int i = 0; i < widget->children->len; ++i)
+    {
+      Widget *child = g_array_index (widget->children, Widget *, i);
+      Widget_dump (child, depth + 1);
+    }
+}

game/src/ui/widget_core.h

@@ -49,7 +49,6 @@ typedef enum WidgetIcon
 
 typedef enum WidgetEvent
   {
-    EVENT_NONE = -1,		/* Don't use. */
     EVENT_TICK = 0,
     EVENT_LEFT_DOWN,
     EVENT_LEFT_UP,
@@ -162,6 +161,8 @@ typedef struct Widget
   WidgetStyle *style;
   WidgetIcon icon;
 
+  GString *tooltip;
+  
   void (*do_layout) (struct Widget *);
   void (*do_render) (struct Widget *, mat4, int);
   
@@ -196,13 +197,19 @@ void Widget_set_style (Widget *widget, WidgetStyle style);
 void Widget_label_set_text (Widget *widget, const char *text);
 void Widget_label_printf (Widget *widget, const char *format, ...);
 
+void Widget_multiline_text_set_text (Widget *widget, const char *text);
+
 void Widget_entry_input_text (Widget *widget, const char *text);
 
 void Widget_scrollable_scroll (Widget *widget, vec2 direction);
 
-Widget *Widget_find_xy_event (Widget *widget, vec2 pos, WidgetEvent event);
-Widget *Widget_find_xy (Widget *widget, vec2 point);
+gboolean wcond_tooltip (Widget *widget, void *userdata);
+gboolean wcond_event (Widget *widget, void *event);
+gboolean wcond_any (Widget *widget, void *userdata);
+Widget *Widget_find_xy_cond (Widget *widget, vec2 point, gboolean (*cond_func) (Widget *, void *), void *userdata);
 
 void Widget_tick (Widget *widget);
 void Widget_render (Widget *widget, mat4 projection, int window_height);
 void Widget_free (Widget *widget);
+
+void Widget_dump (Widget *widget, int depth);