1 files changed, 78 insertions, 0 deletions
diff --git a/src/dialogs/SetBackgroundSlideshow.vala b/src/dialogs/SetBackgroundSlideshow.vala
new file mode 100644
index 0000000..914af76
--- /dev/null
+++ b/src/dialogs/SetBackgroundSlideshow.vala
@@ -0,0 +1,78 @@
+/* Copyright 2016 Software Freedom Conservancy Inc.
+ * Copyright 2017 Jens Georg <mail@jensge.org>
+ *
+ * This software is licensed under the GNU LGPL (version 2.1 or later).
+ * See the COPYING file in this distribution.
+ */
+
+[GtkTemplate (ui = "/org/gnome/Shotwell/ui/set_background_slideshow_dialog.ui")]
+public class SetBackgroundSlideshowDialog : Gtk.Dialog {
+    [GtkChild]
+    private Gtk.CheckButton desktop_background_checkbox;
+    [GtkChild]
+    private Gtk.CheckButton screensaver_checkbox;
+    [GtkChild]
+    private Gtk.Scale delay_scale;
+    [GtkChild]
+    private Gtk.Label delay_value_label;
+
+    private int delay_value = 0;
+
+    public SetBackgroundSlideshowDialog() {
+        Object(use_header_bar: Resources.use_header_bar());
+        this.set_transient_for (AppWindow.get_instance());
+    }
+
+    public override void constructed () {
+        on_delay_scale_value_changed ();
+    }
+
+    [GtkCallback]
+    private void on_checkbox_clicked() {
+        set_response_sensitive (Gtk.ResponseType.OK,
+                                desktop_background_checkbox.active ||
+                                screensaver_checkbox.active);
+    }
+
+    [GtkCallback]
+    private void on_delay_scale_value_changed() {
+        double value = delay_scale.adjustment.value;
+
+        // f(x)=x^5 allows to have fine-grained values (seconds) to the left
+        // and very coarse-grained values (hours) to the right of the slider.
+        // We limit maximum value to 1 day and minimum to 5 seconds.
+        delay_value = (int) (Math.pow(value, 5) / Math.pow(90, 5) * 60 * 60 * 24 + 5);
+
+        // convert to text and remove fractions from values > 1 minute
+        string text;
+        if (delay_value < 60) {
+            text = ngettext("%d second", "%d seconds", delay_value).printf(delay_value);
+        } else if (delay_value < 60 * 60) {
+            int minutes = delay_value / 60;
+            text = ngettext("%d minute", "%d minutes", minutes).printf(minutes);
+            delay_value = minutes * 60;
+        } else if (delay_value < 60 * 60 * 24) {
+            int hours = delay_value / (60 * 60);
+            text = ngettext("%d hour", "%d hours", hours).printf(hours);
+            delay_value = hours * (60 * 60);
+        } else {
+            text = _("1 day");
+            delay_value = 60 * 60 * 24;
+        }
+
+        delay_value_label.label = text;
+    }
+
+    public bool execute(out int delay_value, out bool desktop_background, out bool screensaver) {
+        this.show_all();
+        var result = this.run() == Gtk.ResponseType.OK;
+        this.hide ();
+
+        delay_value = this.delay_value;
+        desktop_background = desktop_background_checkbox.active;
+        screensaver = screensaver_checkbox.active;
+
+        this.destroy();
+        return result;
+    }
+}