WindowServer+MenuApplets: Move the "Audio" applet to its own program

This patch introduces the second MenuApplet: Audio. To make this work,
menu applet windows now also receive mouse events.

There's still some problem with mute/unmute via clicking not actually
working, but the call goes from the applet program over IPC to the
AudioServer, where something goes wrong with the state change message.
Need to look at that separately.

Anyways, it's pretty cool to have more applets running in their own
separate processes. :^)

3 files changed, 72 insertions, 0 deletions

diff --git a/MenuApplets/Audio/Audio.MenuApplet b/MenuApplets/Audio/Audio.MenuApplet
new file mode 100755
index 0000000000..dd4c89fcf9
--- /dev/null
+++ b/MenuApplets/Audio/Audio.MenuApplet
diff --git a/MenuApplets/Audio/Makefile b/MenuApplets/Audio/Makefile
new file mode 100755
index 0000000000..cd0292e1ef
--- /dev/null
+++ b/MenuApplets/Audio/Makefile
@@ -0,0 +1,7 @@
+include ../../Makefile.common
+
+OBJS = main.o 
+
+APP = Audio.MenuApplet
+
+include ../Makefile.common
diff --git a/MenuApplets/Audio/main.cpp b/MenuApplets/Audio/main.cpp
new file mode 100644
index 0000000000..bbd55f750c
--- /dev/null
+++ b/MenuApplets/Audio/main.cpp
@@ -0,0 +1,65 @@
+#include <LibAudio/AClientConnection.h>
+#include <LibGUI/GApplication.h>
+#include <LibGUI/GPainter.h>
+#include <LibGUI/GWidget.h>
+#include <LibGUI/GWindow.h>
+
+class AudioWidget final : public GWidget {
+    C_OBJECT(AudioWidget)
+public:
+    AudioWidget()
+        : GWidget(nullptr)
+    {
+        m_audio_client = make<AClientConnection>();
+        m_audio_client->on_muted_state_change = [this](bool muted) {
+            dbg() << "Muted state changed: " << muted;
+            if (m_audio_muted == muted)
+                return;
+            m_audio_muted = muted;
+            update();
+        };
+        m_unmuted_bitmap = GraphicsBitmap::load_from_file("/res/icons/audio-unmuted.png");
+        m_muted_bitmap = GraphicsBitmap::load_from_file("/res/icons/audio-muted.png");
+    }
+
+    virtual ~AudioWidget() override {}
+
+private:
+    virtual void mousedown_event(GMouseEvent& event) override
+    {
+        if (event.button() != GMouseButton::Left)
+            return;
+        dbg() << "set_muted: " << !m_audio_muted;
+        m_audio_client->set_muted(!m_audio_muted);
+        update();
+    }
+
+    virtual void paint_event(GPaintEvent& event) override
+    {
+        GPainter painter(*this);
+        painter.add_clip_rect(event.rect());
+        painter.clear_rect(event.rect(), Color::from_rgba(0));
+        auto& audio_bitmap = m_audio_muted ? *m_muted_bitmap : *m_unmuted_bitmap;
+        painter.blit({}, audio_bitmap, audio_bitmap.rect());
+    }
+
+    OwnPtr<AClientConnection> m_audio_client;
+    RefPtr<GraphicsBitmap> m_muted_bitmap;
+    RefPtr<GraphicsBitmap> m_unmuted_bitmap;
+    bool m_audio_muted { false };
+};
+
+int main(int argc, char** argv)
+{
+    GApplication app(argc, argv);
+
+    auto window = GWindow::construct();
+    window->set_has_alpha_channel(true);
+    window->set_window_type(GWindowType::MenuApplet);
+    window->resize(12, 16);
+
+    auto widget = AudioWidget::construct();
+    window->set_main_widget(widget);
+    window->show();
+    return app.exec();
+}