use Gtk+ animations instead of manually doing it

This simplifies our code: we can remove our timer and our custom
DrawingAread and its 'draw' hook.
We just have to add the various fading variants of the icon in a
PixbufSimpleAnim, set it to loop forver and let Gtk+ handles the
animation.

This also prevents delayed action to happen before first draw signal
due to bad timing (mga#19827).

2 files changed, 17 insertions, 38 deletions

diff --git a/NEWS b/NEWS
index 5b64b9b0..9e3a37bd 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+- simplify by using Gtk+ animations instead of our own manual one
+  thus preventing delayed action to happen before first draw signal due to bad
+  timing (mga#19827)
+
 Version 13.14 - 30 March 2017, by Thierry Vignaud
 
 - drop legacy loaders for drakbackup, drakmenustyle and tomoyo-gui
diff --git a/control-center b/control-center
index 7434fde7..5ef79346 100755
--- a/control-center
+++ b/control-center
@@ -50,11 +50,6 @@ use Gtk3::WebKit2;
 
 use MDV::Control_Center;
 
-Glib::Object::Introspection->setup(
-    basename => 'PangoCairo',
-    version => '1.0',
-    package => 'Pango::Cairo');
-
 my (%tool_pids, %tool_feedback, $gurpmi_pid);
 
 my ($conffile, $class_install) = ('/etc/mcc.conf', '/etc/sysconfig/system');
@@ -730,7 +725,13 @@ gtkadd($window_global,
                             ], right_child => gtknew('ScrolledWindow', child => gtkset_border_width($view, 5),
                                                      no_shadow => 1, h_policy => 'never')),
                             1, gtkpack(my $emb_box = Gtk3::VBox->new(0, 0),
-                                       my $wait_darea = gtkset_size_request(Gtk3::DrawingArea->new, -1, -1),
+                                       my $wait_darea = gtkset_size_request(
+					   gtkpack_(gtknew('VBox'),
+						    1, gtknew('VBox'),
+						    0, my $wait_img = Gtk3::Image->new,
+						    0, Gtk3::Label->new(N("Loading... Please wait")),
+						    1, gtknew('VBox')
+					   ), -1, -1),
                                       ),
                            ),
                 0, Gtk3::HSeparator->new,
@@ -1044,7 +1045,7 @@ foreach (keys %check_boxes) {
 
 # "wait while launching a program" area :
 
-my ($run_pixbuf, $run_counter, $run_counter_add, %run_pixbufs);
+my $run_pixbuf;
 
 sub stop_wait_area() {
     $wait_darea->hide;
@@ -1052,32 +1053,8 @@ sub stop_wait_area() {
 	    Glib::Source->remove($timeout);
 	    undef $timeout;
     }
-    undef %run_pixbufs;
 }
 
-$wait_darea->signal_connect(draw => sub {
-    my ($w, $cr) = @_;
-    return if !$wait_darea->get_realized;
-    return unless $run_pixbuf; # some people got an expose event before we start an embedded tool
-    $wait_darea->{layout} ||= $wait_darea->create_pango_layout(N("Loading... Please wait"));
-    my $pixbuf = $run_pixbufs{$run_counter} ||= mygtk3::_pixbuf_render_alpha($run_pixbuf, $run_counter);
-    my $size = $wait_darea->get_allocation;
-        my ($d_width, $d_height) = ($size->{width}, $size->{height});
-        ($w->{pix_width}, $w->{pix_height}) = ($pixbuf->get_width, $pixbuf->get_height);
-        my ($txt_width, $txt_height) = $wait_darea->{layout}->get_pixel_size;
-        $w->{pix_yy} = ($d_width  - $w->{pix_width})/2;
-        $w->{pix_xx} = ($d_height - $w->{pix_height} - $txt_height)/2;
-        $w->{text_yy} = $w->{pix_yy} + ($w->{pix_width} - $txt_width)/2;
-        $w->{text_xx} = $w->{pix_xx} + $w->{pix_height} + 5;
-    Gtk3::Gdk::cairo_set_source_pixbuf($cr, $pixbuf, $w->{pix_yy}, $w->{pix_xx}); #0, 0);
-    $cr->paint;
-    $cr->set_source_rgb(0, 0, 0);
-    $cr->move_to($w->{text_yy}, $w->{text_xx});
-    Pango::Cairo::show_layout($cr, $w->{layout});
-    $run_counter += $run_counter_add;
-    $run_counter_add = -$run_counter_add if $run_counter < 100 || 255-$run_counter_add < $run_counter;
-});
-
 gtkflush();
 
 # display first page (we use a timeout so that Y position of widgets is know):
@@ -1256,13 +1233,11 @@ sub run_tool {
             $wait_darea->show;
             $cancel->show;
             $run_pixbuf = eval { gtkcreate_pixbuf($icon . "_128") };
-            $run_counter = 255;
-            $run_counter_add = -5;
-            $timeout = Glib::Timeout->add(35, sub { 
-                                              my $w = $wait_darea;
-                                              $w->queue_draw_area($w->{pix_yy}, $w->{pix_xx}, $w->{pix_width}, $w->{pix_height});
-                                              1;
-                                          });
+            my $anim = Gtk3::Gdk::PixbufSimpleAnim->new(128,128, 1000/35);
+            $anim->add_frame(mygtk3::_pixbuf_render_alpha($run_pixbuf, 255-$_*5)) foreach 0..31; # fade away
+            $anim->add_frame(mygtk3::_pixbuf_render_alpha($run_pixbuf,  95+$_*5)) foreach 0..31; # fade back
+            $anim->set_loop(1);
+            $wait_img->set_from_animation($anim);
             $left_locked = 1;
             $buttons->show;
             $tool_pids{$label} = fork_($exec);