[gnome-software/1790-allow-scrolling-screenshots-by-clicking-on-next-and-previous-screenshots] gs-screenshot-image: Add a "clicked" signal

[Milan Crha <mcrha src gnome org>]

commit bd711b571e8f494e7d3ae08eb665f2ea93b25c76
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jun 7 18:42:39 2022 +0200

    gs-screenshot-image: Add a "clicked" signal
    
    To be used in the following commit.

 src/gs-screenshot-image.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
---
diff --git a/src/gs-screenshot-image.c b/src/gs-screenshot-image.c
index 736f86ac5..759e3201c 100644
--- a/src/gs-screenshot-image.c
+++ b/src/gs-screenshot-image.c
@@ -45,6 +45,25 @@ struct _GsScreenshotImage
 
 G_DEFINE_TYPE (GsScreenshotImage, gs_screenshot_image, GTK_TYPE_WIDGET)
 
+enum {
+       SIGNAL_CLICKED,
+       SIGNAL_LAST
+};
+
+static guint signals [SIGNAL_LAST] = { 0 };
+
+static void
+gs_screenshot_image_clicked_cb (GtkGestureClick *gesture,
+                               gint n_press,
+                               gdouble x,
+                               gdouble y,
+                               gpointer user_data)
+{
+       GsScreenshotImage *self = user_data;
+       if (n_press == 1)
+               g_signal_emit (self, signals[SIGNAL_CLICKED], 0);
+}
+
 AsScreenshot *
 gs_screenshot_image_get_screenshot (GsScreenshotImage *ssimg)
 {
@@ -769,10 +788,17 @@ gs_screenshot_image_dispose (GObject *object)
 static void
 gs_screenshot_image_init (GsScreenshotImage *ssimg)
 {
+       GtkGesture *gesture;
+
        ssimg->settings = g_settings_new ("org.gnome.software");
        ssimg->showing_image = FALSE;
 
        gtk_widget_init_template (GTK_WIDGET (ssimg));
+
+       gesture = gtk_gesture_click_new ();
+       g_signal_connect_object (gesture, "released",
+               G_CALLBACK (gs_screenshot_image_clicked_cb), ssimg, 0);
+       gtk_widget_add_controller (GTK_WIDGET (ssimg), GTK_EVENT_CONTROLLER (gesture));
 }
 
 static void
@@ -812,6 +838,13 @@ gs_screenshot_image_class_init (GsScreenshotImageClass *klass)
        gtk_widget_class_bind_template_child (widget_class, GsScreenshotImage, image2);
        gtk_widget_class_bind_template_child (widget_class, GsScreenshotImage, box_error);
        gtk_widget_class_bind_template_child (widget_class, GsScreenshotImage, label_error);
+
+       signals [SIGNAL_CLICKED] =
+               g_signal_new ("clicked",
+                             G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST,
+                             0,
+                             NULL, NULL, g_cclosure_marshal_VOID__VOID,
+                             G_TYPE_NONE, 0);
 }
 
 GtkWidget *