[pitivi] viewer: Show resize status

[Alexandru Băluț <alexbalut src gnome org>]

commit d91c1283a85b4041e57253f7086ac2706f42acdd
Author: HarishFulara07 <harish14143 iiitd ac in>
Date:   Tue Aug 7 18:17:42 2018 +0530

    viewer: Show resize status

 pitivi/editorperspective.py    |  4 ++--
 pitivi/utils/ui.py             |  8 +++++++-
 pitivi/viewer/overlay_stack.py | 40 ++++++++++++++++++++++++++++++++++++++++
 pitivi/viewer/viewer.py        | 11 +++++++++++
 4 files changed, 60 insertions(+), 3 deletions(-)
---
diff --git a/pitivi/editorperspective.py b/pitivi/editorperspective.py
index b1fb4d96..8441e8c8 100644
--- a/pitivi/editorperspective.py
+++ b/pitivi/editorperspective.py
@@ -43,10 +43,10 @@ from pitivi.transitions import TransitionsListWidget
 from pitivi.utils.loggable import Loggable
 from pitivi.utils.misc import path_from_uri
 from pitivi.utils.ui import beautify_time_delta
+from pitivi.utils.ui import EDITOR_PERSPECTIVE_CSS
 from pitivi.utils.ui import info_name
 from pitivi.utils.ui import PADDING
 from pitivi.utils.ui import SPACING
-from pitivi.utils.ui import TIMELINE_CSS
 from pitivi.viewer.viewer import ViewerContainer
 
 
@@ -110,7 +110,7 @@ class EditorPerspective(Perspective, Loggable):
 
     def __setup_css(self):
         css_provider = Gtk.CssProvider()
-        css_provider.load_from_data(TIMELINE_CSS.encode('UTF-8'))
+        css_provider.load_from_data(EDITOR_PERSPECTIVE_CSS.encode("UTF-8"))
         screen = Gdk.Screen.get_default()
         style_context = self.app.gui.get_style_context()
         style_context.add_provider_for_screen(screen, css_provider,
diff --git a/pitivi/utils/ui.py b/pitivi/utils/ui.py
index 9d9dc015..c175c8b7 100644
--- a/pitivi/utils/ui.py
+++ b/pitivi/utils/ui.py
@@ -157,7 +157,13 @@ GREETER_PERSPECTIVE_CSS = """
     }
 """
 
-TIMELINE_CSS = """
+EDITOR_PERSPECTIVE_CSS = """
+    #resize_status {
+        font-size: 200%%;
+        background-color: black;
+        opacity: 0.8;
+    }
+
     .AudioBackground {
         background-color: #496c21;
     }
diff --git a/pitivi/viewer/overlay_stack.py b/pitivi/viewer/overlay_stack.py
index 2da6a7f9..e1389d10 100644
--- a/pitivi/viewer/overlay_stack.py
+++ b/pitivi/viewer/overlay_stack.py
@@ -19,6 +19,7 @@
 import numpy
 from gi.repository import Gdk
 from gi.repository import GES
+from gi.repository import GLib
 from gi.repository import Gtk
 
 from pitivi.utils.loggable import Loggable
@@ -50,6 +51,19 @@ class OverlayStack(Gtk.Overlay, Loggable):
         self.add(sink_widget)
         self.connect("size-allocate", self.__on_size_allocate)
 
+        # Whether to show the percent of the size relative to the project size.
+        # It is set to false initially because the viewer gets resized
+        # while the project is loading and we don't want to show the percent
+        # in this case.
+        self.__show_resize_status = False
+        # ID of resizing timeout callback, so it can be delayed.
+        self.__resizing_id = 0
+        self.revealer = Gtk.Revealer(transition_type=Gtk.RevealerTransitionType.CROSSFADE)
+        self.resize_status = Gtk.Label(name="resize_status")
+        self.revealer.add(self.resize_status)
+        self.add_overlay(self.revealer)
+        sink_widget.connect("size-allocate", self.__sink_widget_size_allocate_cb)
+
     def __on_size_allocate(self, widget, rectangle):
         self.window_size = numpy.array([rectangle.width,
                                         rectangle.height])
@@ -169,3 +183,29 @@ class OverlayStack(Gtk.Overlay, Loggable):
 
     def get_normalized_cursor_position(self, cursor_position):
         return cursor_position / self.window_size
+
+    def enable_resize_status(self, enabled):
+        self.__show_resize_status = enabled
+
+    def __sink_widget_size_allocate_cb(self, unused_widget, allocation):
+        if not self.__show_resize_status:
+            return
+
+        if not self.revealer.get_reveal_child():
+            self.revealer.set_transition_duration(10)
+            self.revealer.set_reveal_child(True)
+
+        video_width = self.app.project_manager.current_project.videowidth
+        percent = int(allocation.width / video_width * 100)
+        self.resize_status.set_text("{}%".format(percent))
+
+        # Add timeout function to hide the resize percent.
+        if self.__resizing_id:
+            GLib.source_remove(self.__resizing_id)
+        self.__resizing_id = GLib.timeout_add(1000, self.__resizing_timeout_cb, None)
+
+    def __resizing_timeout_cb(self, unused_data):
+        self.__resizing_id = 0
+        self.revealer.set_transition_duration(500)
+        self.revealer.set_reveal_child(False)
+        return False
diff --git a/pitivi/viewer/viewer.py b/pitivi/viewer/viewer.py
index 9affab43..679bd443 100644
--- a/pitivi/viewer/viewer.py
+++ b/pitivi/viewer/viewer.py
@@ -21,6 +21,7 @@ from time import time
 
 from gi.repository import Gdk
 from gi.repository import GES
+from gi.repository import GLib
 from gi.repository import GObject
 from gi.repository import Gst
 from gi.repository import Gtk
@@ -148,6 +149,10 @@ class ViewerContainer(Gtk.Box, Loggable):
         self.setDisplayAspectRatio(self.app.project_manager.current_project.getDAR())
         self.target.show_all()
 
+        # Wait for 1s to make sure that the viewer has completely realized
+        # and then we can mark the resize status as showable.
+        GLib.timeout_add(1000, self.__viewer_realization_done_cb, None)
+
     def _disconnectFromPipeline(self):
         if self.pipeline is None:
             # silently return, there's nothing to disconnect from
@@ -402,6 +407,7 @@ class ViewerContainer(Gtk.Box, Loggable):
 
         self.docked = False
         self.settings.viewerDocked = False
+        self.overlay_stack.enable_resize_status(False)
         self.remove(self.buttons_container)
         position = None
         if self.pipeline:
@@ -431,6 +437,10 @@ class ViewerContainer(Gtk.Box, Loggable):
             self.pipeline.pause()
             self.pipeline.simple_seek(position)
 
+    def __viewer_realization_done_cb(self, unused_data):
+        self.overlay_stack.enable_resize_status(True)
+        return False
+
     def dock(self):
         if self.docked:
             self.warning("The viewer is already docked")
@@ -438,6 +448,7 @@ class ViewerContainer(Gtk.Box, Loggable):
 
         self.docked = True
         self.settings.viewerDocked = True
+        self.overlay_stack.enable_resize_status(False)
 
         position = None
         if self.pipeline: