implement progressbar

src/app/browser/main/tab/page/progressbar.cpp

@@ -0,0 +1,53 @@
+#include "progressbar.hpp"
+
+using namespace app::browser::main::tab::page;
+
+Progressbar::Progressbar()
+{
+    set_margin_top(
+        MARGIN
+    );
+
+    set_margin_bottom(
+        MARGIN
+    );
+
+    set_pulse_step(
+        PULSE_STEP
+    );
+
+    set_opacity(0);
+}
+
+Progressbar::~Progressbar() = default;
+
+// Public actions
+void Progressbar::set(
+    double fraction
+) {
+    // Toggle transparency
+    set_opacity(
+        fraction < 1 ? 1 : 0
+    );
+
+    // Reset initial progress
+    progress = fraction;
+
+    // Animate progress function
+    Glib::signal_timeout().connect(
+        [this]() -> bool
+        {
+            double current = get_fraction();
+
+            if (current < progress)
+            {
+                set_fraction(
+                    current + PULSE_STEP
+                );
+            }
+
+            return current < 1;
+        },
+        ANIMATION_TIME
+    );
+}

src/app/browser/main/tab/page/progressbar.hpp

@@ -0,0 +1,28 @@
+#ifndef APP_BROWSER_MAIN_TAB_PAGE_PROGRESSBAR_HPP
+#define APP_BROWSER_MAIN_TAB_PAGE_PROGRESSBAR_HPP
+
+#include <glibmm/main.h>
+#include <gtkmm/progressbar.h>
+
+namespace app::browser::main::tab::page
+{
+    class Progressbar : public Gtk::ProgressBar
+    {
+        const int MARGIN = 2;
+        const double PULSE_STEP = .1;
+        const int ANIMATION_TIME = 10;
+
+        double progress = 0;
+
+        public:
+
+            Progressbar();
+            ~Progressbar();
+
+            void set(
+                double fraction
+            );
+    };
+}
+
+#endif // APP_BROWSER_MAIN_TAB_PAGE_PROGRESSBAR_HPP