1 files changed, 125 insertions, 0 deletions
diff --git a/src/components/volumemeter.cpp b/src/components/volumemeter.cpp
new file mode 100644
index 0000000..380af55
--- /dev/null
+++ b/src/components/volumemeter.cpp
@@ -0,0 +1,125 @@
+#include "volumemeter.hpp"
+#include <cstring>
+
+VolumeMeter::VolumeMeter()
+    : Glib::ObjectBase("volumemeter")
+    , Gtk::Widget() {
+    set_has_window(true);
+}
+
+void VolumeMeter::SetVolume(double fraction) {
+    m_fraction = fraction;
+    queue_draw();
+}
+
+void VolumeMeter::SetTick(double fraction) {
+    m_tick = fraction;
+    queue_draw();
+}
+
+void VolumeMeter::SetShowTick(bool show) {
+    m_show_tick = show;
+}
+
+Gtk::SizeRequestMode VolumeMeter::get_request_mode_vfunc() const {
+    return Gtk::Widget::get_request_mode_vfunc();
+}
+
+void VolumeMeter::get_preferred_width_vfunc(int &minimum_width, int &natural_width) const {
+    const int width = get_allocated_width();
+    minimum_width = natural_width = width;
+}
+
+void VolumeMeter::get_preferred_width_for_height_vfunc(int height, int &minimum_width, int &natural_width) const {
+    get_preferred_width_vfunc(minimum_width, natural_width);
+}
+
+void VolumeMeter::get_preferred_height_vfunc(int &minimum_height, int &natural_height) const {
+    // blehhh :PPP
+    const int height = get_allocated_height();
+    minimum_height = natural_height = 4;
+}
+
+void VolumeMeter::get_preferred_height_for_width_vfunc(int width, int &minimum_height, int &natural_height) const {
+    get_preferred_height_vfunc(minimum_height, natural_height);
+}
+
+void VolumeMeter::on_size_allocate(Gtk::Allocation &allocation) {
+    set_allocation(allocation);
+
+    if (m_window)
+        m_window->move_resize(allocation.get_x(), allocation.get_y(), allocation.get_width(), allocation.get_height());
+}
+
+void VolumeMeter::on_map() {
+    Gtk::Widget::on_map();
+}
+
+void VolumeMeter::on_unmap() {
+    Gtk::Widget::on_unmap();
+}
+
+void VolumeMeter::on_realize() {
+    set_realized(true);
+
+    if (!m_window) {
+        GdkWindowAttr attributes;
+        std::memset(&attributes, 0, sizeof(attributes));
+
+        auto allocation = get_allocation();
+
+        attributes.x = allocation.get_x();
+        attributes.y = allocation.get_y();
+        attributes.width = allocation.get_width();
+        attributes.height = allocation.get_height();
+
+        attributes.event_mask = get_events() | Gdk::EXPOSURE_MASK;
+        attributes.window_type = GDK_WINDOW_CHILD;
+        attributes.wclass = GDK_INPUT_OUTPUT;
+
+        m_window = Gdk::Window::create(get_parent_window(), &attributes, GDK_WA_X | GDK_WA_Y);
+        set_window(m_window);
+
+        m_window->set_user_data(gobj());
+    }
+}
+
+void VolumeMeter::on_unrealize() {
+    m_window.reset();
+
+    Gtk::Widget::on_unrealize();
+}
+
+bool VolumeMeter::on_draw(const Cairo::RefPtr<Cairo::Context> &cr) {
+    const auto allocation = get_allocation();
+    const auto width = allocation.get_width();
+    const auto height = allocation.get_height();
+
+    const double LOW_MAX = 0.7 * width;
+    const double MID_MAX = 0.85 * width;
+    const double desired_width = width * m_fraction;
+
+    const double draw_low = std::min(desired_width, LOW_MAX);
+    const double draw_mid = std::min(desired_width, MID_MAX);
+    const double draw_hi = desired_width;
+
+    cr->set_source_rgb(1.0, 0.0, 0.0);
+    cr->rectangle(0.0, 0.0, draw_hi, height);
+    cr->fill();
+    cr->set_source_rgb(1.0, 0.5, 0.0);
+    cr->rectangle(0.0, 0.0, draw_mid, height);
+    cr->fill();
+    cr->set_source_rgb(.0, 1.0, 0.0);
+    cr->rectangle(0.0, 0.0, draw_low, height);
+    cr->fill();
+
+    if (m_show_tick) {
+        const double tick_base = width * m_tick;
+
+        cr->set_source_rgb(0.8, 0.8, 0.8);
+        cr->rectangle(tick_base, 0, 4, height);
+        cr->fill();
+    }
+
+    return true;
+}