Add audio revealer

This adds an option to hide the audio slider behind a revealer, which
works similar to the sensors.
For the ping: https://github.com/scorpion-26/gBar/issues/5

data/config

@@ -31,3 +31,6 @@ DefaultWorkspaceSymbol: 
 # Forces the time to be centered.
 # This can cause issues, if there is not enough space on screen (e.g. when opening the text)
 CenterTime: true
+
+# Sets the audio slider to be on reveal (Just like the sensors) when true. Only affects the bar.
+AudioRevealer: false

src/Bar.cpp

@@ -221,15 +221,8 @@ namespace Bar
 
     void WidgetAudio(Widget& parent)
     {
-        auto box = Widget::Create<Box>();
-        box->SetSpacing({8, false});
-        box->SetHorizontalTransform({-1, false, Alignment::Right});
+        auto widgetAudioSlider = [](Widget& parent)
         {
-            auto icon = Widget::Create<Text>();
-            icon->SetClass("audio-icon");
-            icon->SetText("墳");
-            DynCtx::audioIcon = icon.get();
-
             auto slider = Widget::Create<Slider>();
             slider->SetOrientation(Orientation::Horizontal);
             slider->SetHorizontalTransform({100, true, Alignment::Fill});
@@ -239,11 +232,60 @@ namespace Bar
             slider->OnValueChange(DynCtx::OnChangeVolume);
             slider->SetRange({0, 1, 0.01});
 
-            box->AddChild(std::move(slider));
-            box->AddChild(std::move(icon));
-        }
+            parent.AddChild(std::move(slider));
+        };
 
-        parent.AddChild(std::move(box));
+        auto widgetAudioBody = [&widgetAudioSlider](Widget& parent)
+        {
+            auto box = Widget::Create<Box>();
+            box->SetSpacing({8, false});
+            box->SetHorizontalTransform({-1, true, Alignment::Right});
+            {
+                auto icon = Widget::Create<Text>();
+                icon->SetClass("audio-icon");
+                icon->SetText("墳");
+                DynCtx::audioIcon = icon.get();
+
+                if (Config::Get().audioRevealer)
+                {
+                    EventBox& eventBox = (EventBox&)parent;
+                    auto revealer = Widget::Create<Revealer>();
+                    revealer->SetTransition({TransitionType::SlideLeft, 500});
+                    // Add event to eventbox for the revealer to open
+                    eventBox.SetEventFn(
+                        [slideRevealer = revealer.get()](EventBox&, bool hovered)
+                        {
+                            slideRevealer->SetRevealed(hovered);
+                        });
+                    {
+                        widgetAudioSlider(*revealer);
+                    }
+
+                    box->AddChild(std::move(revealer));
+                }
+                else
+                {
+                    // Straight forward
+                    widgetAudioSlider(*box);
+                }
+
+                box->AddChild(std::move(icon));
+            }
+            parent.AddChild(std::move(box));
+        };
+
+        if (Config::Get().audioRevealer)
+        {
+            // Need an EventBox
+            auto eventBox = Widget::Create<EventBox>();
+            widgetAudioBody(*eventBox);
+            parent.AddChild(std::move(eventBox));
+        }
+        else
+        {
+            // Just invoke it.
+            widgetAudioBody(parent);
+        }
     }
 
 #ifdef WITH_BLUEZ

src/Config.cpp

@@ -123,7 +123,6 @@ void Config::Load()
         AddConfigVar("LockCommand", config.lockCommand, lineView, foundProperty);
         AddConfigVar("ExitCommand", config.exitCommand, lineView, foundProperty);
         AddConfigVar("BatteryFolder", config.batteryFolder, lineView, foundProperty);
-        AddConfigVar("CenterTime", config.centerTime, lineView, foundProperty);
         AddConfigVar("DefaultWorkspaceSymbol", config.defaultWorkspaceSymbol, lineView, foundProperty);
         for (int i = 1; i < 10; i++)
         {
@@ -131,6 +130,9 @@ void Config::Load()
             AddConfigVar("WorkspaceSymbol-" + std::to_string(i), config.workspaceSymbols[i - 1], lineView, foundProperty);
         }
 
+        AddConfigVar("CenterTime", config.centerTime, lineView, foundProperty);
+        AddConfigVar("AudioRevealer", config.audioRevealer, lineView, foundProperty);
+
         if (foundProperty == false)
         {
             LOG("Warning: unknown config var: " << line);

src/Config.h

@@ -14,6 +14,7 @@ public:
     std::string defaultWorkspaceSymbol = "";
 
     bool centerTime = true;
+    bool audioRevealer = false;
 
     static void Load();
     static const Config& Get();

src/Widget.cpp

@@ -131,6 +131,11 @@ void Widget::SetVisible(bool visible)
     gtk_widget_set_visible(m_Widget, visible);
 }
 
+void Widget::PropagateToParent(GdkEvent* event)
+{
+    gtk_propagate_event(gtk_widget_get_parent(m_Widget), event);
+}
+
 void Widget::ApplyPropertiesToWidget()
 {
     // Apply style
@@ -189,6 +194,7 @@ void EventBox::SetEventFn(std::function<void(EventBox&, bool)>&& fn)
 void EventBox::Create()
 {
     m_Widget = gtk_event_box_new();
+    gtk_event_box_set_above_child((GtkEventBox*)m_Widget, false);
     auto enter = [](GtkWidget*, GdkEventCrossing*, gpointer data) -> gboolean
     {
         EventBox* box = (EventBox*)data;
@@ -324,11 +330,12 @@ void Text::Create()
 void Button::Create()
 {
     m_Widget = gtk_button_new_with_label(m_Text.c_str());
-    auto clickFn = [](UNUSED GtkButton* gtkButton, void* data)
+    auto clickFn = [](UNUSED GtkButton* gtkButton, void* data) -> gboolean
     {
         Button* button = (Button*)data;
         if (button->m_OnClick)
             button->m_OnClick(*button);
+        return GDK_EVENT_STOP;
     };
     g_signal_connect(m_Widget, "clicked", G_CALLBACK(+clickFn), this);
     ApplyPropertiesToWidget();
@@ -386,5 +393,18 @@ void Slider::Create()
         return false;
     };
     g_signal_connect(m_Widget, "change-value", G_CALLBACK(+changedFn), this);
+
+    // Propagate events to any parent eventboxes
+    auto propagate = [](GtkWidget*, GdkEventCrossing* data, gpointer widget) -> gboolean
+    {
+        Slider* slider = (Slider*)widget;
+        // Seems to be necessary. For revealers to work properly, we need to notify it of the event through propagation.
+        // Automatic propagation with GDK_EVENT_PROPAGATE doesn't work for some reason
+        slider->PropagateToParent((GdkEvent*)data);
+        return GDK_EVENT_PROPAGATE;
+    };
+    gtk_widget_set_events(m_Widget, GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK);
+    g_signal_connect(m_Widget, "enter-notify-event", G_CALLBACK(+propagate), this);
+    g_signal_connect(m_Widget, "leave-notify-event", G_CALLBACK(+propagate), this);
     ApplyPropertiesToWidget();
 }

src/Widget.h

@@ -141,6 +141,7 @@ public:
     void SetVisible(bool visible);
 
 protected:
+    void PropagateToParent(GdkEvent* event);
     void ApplyPropertiesToWidget();
 
     GtkWidget* m_Widget = nullptr;