1 files changed, 109 insertions, 0 deletions
diff --git a/src/library/BackgroundProgressBar.vala b/src/library/BackgroundProgressBar.vala
new file mode 100644
index 0000000..8ad7185
--- /dev/null
+++ b/src/library/BackgroundProgressBar.vala
@@ -0,0 +1,109 @@
+/* Copyright 2016 Software Freedom Conservancy Inc.
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later).  See the COPYING file in this distribution.
+ */
+
+internal class BackgroundProgressBar : Gtk.ProgressBar {
+    public enum Priority {
+        NONE = 0,
+        STARTUP_SCAN = 35,
+        REALTIME_UPDATE = 40,
+        REALTIME_IMPORT = 50,
+        METADATA_WRITER = 30
+    }
+
+    public bool should_be_visible { get; private set; default = false; }
+
+#if UNITY_SUPPORT
+    // UnityProgressBar: init
+    private UnityProgressBar uniprobar = UnityProgressBar.get_instance();
+#endif
+
+    private const int PULSE_MSEC = 250;
+
+    public BackgroundProgressBar() {
+        Object(show_text: true);
+    }
+
+    private Priority current_priority = Priority.NONE;
+    private uint pulse_id = 0;
+
+    public void start(string label, Priority priority) {
+        if (priority < current_priority)
+            return;
+
+        stop(priority, false);
+
+        current_priority = priority;
+        set_text(label);
+        pulse();
+        should_be_visible = true;
+        pulse_id = Timeout.add(PULSE_MSEC, on_pulse_timeout);
+    }
+
+    public void stop(Priority priority, bool clear) {
+        if (priority < current_priority)
+            return;
+
+        if (pulse_id != 0) {
+            Source.remove(pulse_id);
+            pulse_id = 0;
+        }
+
+        if (clear)
+            this.clear(priority);
+    }
+
+    public bool update(string label, Priority priority, double count, double total) {
+        if (priority < current_priority)
+            return false;
+
+        stop(priority, false);
+
+        if (count <= 0.0 || total <= 0.0 || count >= total) {
+            clear(priority);
+
+            return false;
+        }
+
+        current_priority = priority;
+
+        double fraction = count / total;
+        set_fraction(fraction);
+        set_text(_("%s (%d%%)").printf(label, (int) (fraction * 100.0)));
+        should_be_visible = true;
+
+#if UNITY_SUPPORT
+        // UnityProgressBar: try to draw & set progress
+        uniprobar.set_visible(true);
+        uniprobar.set_progress(fraction);
+#endif
+
+        return true;
+    }
+
+    public void clear(Priority priority) {
+        if (priority < current_priority)
+            return;
+
+        stop(priority, false);
+
+        current_priority = 0;
+
+        set_fraction(0.0);
+        set_text("");
+        should_be_visible = false;
+
+#if UNITY_SUPPORT
+        // UnityProgressBar: reset
+        uniprobar.reset();
+#endif
+    }
+
+    private bool on_pulse_timeout() {
+        pulse();
+
+        return true;
+    }
+}