Multi-style state and disabled state propagation.

src/ui/elements/ui_button.cpp

@@ -4,9 +4,10 @@
 
 namespace recompui {
 
-    static const std::string hover_style_name = "hover";
+    static const std::string hover_state = "hover";
+    static const std::string disabled_state = "disabled";
 
-    Button::Button(const std::string &text, ButtonStyle style, Element *parent) : Element(parent, Events(EventType::Click, EventType::Hover), "button") {
+    Button::Button(const std::string &text, ButtonStyle style, Element *parent) : Element(parent, Events(EventType::Click, EventType::Hover, EventType::Enable), "button") {
         this->style = style;
 
         set_text(text);
@@ -47,8 +48,15 @@ namespace recompui {
             break;
         }
 
-        add_style(hover_style_name, &hover_style);
-    
+        disabled_style.set_border_color({ 128, 128, 128, border_hover_opacity });
+        disabled_style.set_background_color({ 128, 128, 128, background_hover_opacity });
+        hover_disabled_style.set_border_color({ 196, 196, 196, border_hover_opacity });
+        hover_disabled_style.set_background_color({ 196, 196, 196, background_hover_opacity });
+
+        add_style(&hover_style, { hover_state });
+        add_style(&disabled_style, { disabled_state });
+        add_style(&hover_disabled_style, { hover_state, disabled_state });
+
         // transition: color 0.05s linear-in-out, background-color 0.05s linear-in-out;
     }
 
@@ -60,7 +68,10 @@ namespace recompui {
             }
             break;
         case EventType::Hover:
-            enable_style(hover_style_name, e.hover.active);
+            set_style_enabled(hover_state, e.hover.active);
+            break;
+        case EventType::Enable:
+            set_style_enabled(disabled_state, !e.enable.enable);
             break;
         default:
             assert(false && "Unknown event type.");

src/ui/elements/ui_button.h

@@ -13,6 +13,8 @@ namespace recompui {
     protected:
         ButtonStyle style = ButtonStyle::Primary;
         Style hover_style;
+        Style disabled_style;
+        Style hover_disabled_style;
         std::list<std::function<void()>> pressed_callbacks;
 
         // Element overrides.

src/ui/elements/ui_element.cpp

@@ -67,6 +67,8 @@ void Element::set_property(Rml::PropertyId property_id, const Rml::Property &pro
 void Element::register_event_listeners(uint32_t events_enabled) {
     assert(base != nullptr);
 
+    this->events_enabled = events_enabled;
+
     if (events_enabled & Events(EventType::Click)) {
         base->AddEventListener(Rml::EventId::Mousedown, this);
     }
@@ -91,13 +93,31 @@ void Element::apply_style(Style *style) {
 void Element::apply_styles() {
     apply_style(this);
 
-    for (size_t i = 0; i < styles_active.size(); i++) {
-        if (styles_active[i]) {
+    for (size_t i = 0; i < styles_counter.size(); i++) {
+        if (styles_counter[i] == 0) {
             apply_style(styles[i]);
         }
     }
 }
 
+void Element::propagate_disabled(bool disabled) {
+    disabled_from_parent = disabled;
+
+    bool attribute_state = disabled_from_parent || !enabled;
+    if (disabled_attribute != attribute_state) {
+        disabled_attribute = attribute_state;
+        base->SetAttribute("disabled", attribute_state);
+
+        if (events_enabled & Events(EventType::Enable)) {
+            process_event(Event::enable_event(!attribute_state));
+        }
+
+        for (auto &child : children) {
+            child->propagate_disabled(attribute_state);
+        }
+    }
+}
+
 void Element::ProcessEvent(Rml::Event &event) {
     // Events that are processed during any phase.
     switch (event.GetId()) {
@@ -137,25 +157,59 @@ void Element::clear_children() {
     children.clear();
 }
 
-void Element::add_style(const std::string &style_name, Style *style) {
-    assert(style_name_index_map.find(style_name) == style_name_index_map.end());
+void Element::add_style(Style *style, const std::list<std::string> &style_names) {
+    for (const std::string &style_name : style_names) {
+        style_name_index_map.emplace(style_name, styles.size());
+    }
 
-    style_name_index_map[style_name] = styles.size();
     styles.emplace_back(style);
-    styles_active.push_back(false);
+
+    uint32_t initial_style_counter = style_names.size();
+    for (const std::string &style_name : style_names) {
+        if (style_active_set.find(style_name) != style_active_set.end()) {
+            initial_style_counter--;
+        }
+    }
+
+    styles_counter.push_back(initial_style_counter);
 }
 
-void Element::enable_style(const std::string &style_name, bool enable) {
-    auto it = style_name_index_map.find(style_name);
-    assert(it != style_name_index_map.end());
+void Element::set_enabled(bool enabled) {
+    this->enabled = enabled;
 
-    styles_active[it->second] = enable;
-
-    apply_styles();
+    propagate_disabled(disabled_from_parent);
 }
 
 void Element::set_text(const std::string &text) {
     base->SetInnerRML(text);
 }
 
+void Element::set_style_enabled(const std::string &style_name, bool enable) {
+    if (enable && style_active_set.find(style_name) == style_active_set.end()) {
+        // Style was disabled and will be enabled.
+        style_active_set.emplace(style_name);
+
+    }
+    else if (!enable && style_active_set.find(style_name) != style_active_set.end()) {
+        // Style was enabled and will be disabled.
+        style_active_set.erase(style_name);
+    }
+    else {
+        // Do nothing.
+        return;
+    }
+
+    auto range = style_name_index_map.equal_range(style_name);
+    for (auto it = range.first; it != range.second; it++) {
+        if (enable) {
+            styles_counter[it->second]--;
+        }
+        else {
+            styles_counter[it->second]++;
+        }
+    }
+
+    apply_styles();
+}
+
 };

src/ui/elements/ui_element.h

@@ -2,19 +2,23 @@
 
 #include "ui_style.h"
 
+#include <unordered_set>
+
 namespace recompui {
 
 class Element : public Style, public Rml::EventListener {
     friend class Element;
 private:
     std::vector<Style *> styles;
-    std::vector<bool> styles_active;
-    std::map<std::string, uint32_t> style_name_index_map;
+    std::vector<uint32_t> styles_counter;
+    std::unordered_set<std::string> style_active_set;
+    std::unordered_multimap<std::string, uint32_t> style_name_index_map;
 
     void add_child(Element *child);
     void register_event_listeners(uint32_t events_enabled);
     void apply_style(Style *style);
     void apply_styles();
+    void propagate_disabled(bool disabled);
 
     // Style overrides.
     virtual void set_property(Rml::PropertyId property_id, const Rml::Property &property, Animation animation) override;
@@ -24,8 +28,12 @@ private:
 protected:
     Rml::Element *base = nullptr;
     std::vector<std::unique_ptr<Element>> children;
+    uint32_t events_enabled = 0;
     bool owner = false;
     bool orphaned = false;
+    bool enabled = true;
+    bool disabled_attribute = false;
+    bool disabled_from_parent = false;
 
     virtual void process_event(const Event &e);
 public:
@@ -36,9 +44,10 @@ public:
     Element(Element *parent, uint32_t events_enabled = 0, Rml::String base_class = "div");
     virtual ~Element();
     void clear_children();
-    void add_style(const std::string &style_name, Style *style);
-    void enable_style(const std::string &style_name, bool enable);
+    void add_style(Style *style, const std::list<std::string> &style_names);
+    void set_enabled(bool enabled);
     void set_text(const std::string &text);
+    void set_style_enabled(const std::string &style_name, bool enabled);
 };
 
 } // namespace recompui

src/ui/elements/ui_types.h

@@ -21,6 +21,7 @@ namespace recompui {
         Click,
         Focus,
         Hover,
+        Enable,
         Count
     };
 
@@ -54,6 +55,10 @@ namespace recompui {
             struct {
                 bool active;
             } hover;
+
+            struct {
+                bool enable;
+            } enable;
         };
 
         static Event click_event(float x, float y) {
@@ -77,6 +82,13 @@ namespace recompui {
             e.focus.active = active;
             return e;
         }
+
+        static Event enable_event(bool enable) {
+            Event e = {};
+            e.type = EventType::Enable;
+            e.enable.enable = enable;
+            return e;
+        }
     };
 
     enum class Display {