[longomatch] Add helper functions to make code more readable.

[Andoni Morales Alastruey <amorales src gnome org>]

commit b9c9eec30e26ccce088fdf423cb7fc7e565caea0
Author: Julien Moutte <julien fluendo com>
Date:   Sat Mar 14 09:41:04 2015 +0100

    Add helper functions to make code more readable.

 LongoMatch.GUI/Gui/Component/ProjectPeriods.cs |   52 +++++++++++++++++------
 1 files changed, 38 insertions(+), 14 deletions(-)
---
diff --git a/LongoMatch.GUI/Gui/Component/ProjectPeriods.cs b/LongoMatch.GUI/Gui/Component/ProjectPeriods.cs
index 7c9ccab..3e099c6 100644
--- a/LongoMatch.GUI/Gui/Component/ProjectPeriods.cs
+++ b/LongoMatch.GUI/Gui/Component/ProjectPeriods.cs
@@ -43,6 +43,11 @@ namespace LongoMatch.Gui.Component
                bool projectHasPeriods;
                double maxSecondsPerPixels;
 
+               enum DidacticMessage {
+                       Initial,
+                       CameraOutOfScope,
+               }
+
                public ProjectPeriods ()
                {
                        this.Build ();
@@ -60,12 +65,9 @@ namespace LongoMatch.Gui.Component
                        main_cam_audio_button.Active = true;
                        sec_cam_audio_button.Active = false;
 
-                       // We control visibility of those widgets
+                       // We control visibility of those widgets, they are hidden at startup
                        sec_cam_vbox.NoShowAll = true;
-                       sec_cam_vbox.Visible = false;
                        sec_cam_didactic_label.NoShowAll = true;
-                       sec_cam_didactic_label.Visible = true;
-                       sec_cam_didactic_label.Text = Catalog.GetString ("Drag the bars in the timeline to 
synchronize secondary video files with the main video");
 
                        timerule = new Timerule (new WidgetWrapper (timerulearea));
                        camerasTimeline = new CamerasTimeline (new WidgetWrapper (timelinearea));
@@ -259,7 +261,7 @@ namespace LongoMatch.Gui.Component
                        if (sec_cam_playerbin.Opened) {
                                MediaFile mf = sec_cam_playerbin.MediaFileSet.First ();
                                if (mf.Duration + mf.Offset < currentTime) {
-                                       HandleOutOfScope ();
+                                       ShowDidactic (DidacticMessage.CameraOutOfScope);
                                }
                        }
                        QueueDraw ();
@@ -289,14 +291,39 @@ namespace LongoMatch.Gui.Component
                        }
                }
 
+               void HideSecondaryPlayer ()
+               {
+                       sec_cam_vbox.Hide ();
+               }
+
+               void ShowSecondaryPlayer ()
+               {
+                       if (!sec_cam_vbox.Visible) {
+                               HideDidactic ();
+                               sec_cam_vbox.Show ();
+                       }
+               }
+
+               void HideDidactic ()
+               {
+                       sec_cam_didactic_label.Hide ();
+               }
+
                /// <summary>
                /// Handles the case where the secondary video gets out of scope compared to current time of 
main video.
                /// </summary>
-               void HandleOutOfScope ()
+               void ShowDidactic (DidacticMessage message)
                {
-                       // Camera is out of scope, show didactic message
-                       sec_cam_vbox.Hide ();
-                       sec_cam_didactic_label.Text = Catalog.GetString ("Camera out of scope");
+                       // Show didactic message, hide secondary player
+                       HideSecondaryPlayer ();
+                       switch (message) {
+                       case DidacticMessage.Initial:
+                               sec_cam_didactic_label.Text = Catalog.GetString ("Drag the bars in the 
timeline to synchronize secondary video files with the main video");
+                               break;
+                       case DidacticMessage.CameraOutOfScope:
+                               sec_cam_didactic_label.Text = Catalog.GetString ("Camera out of scope");
+                               break;
+                       }
                        sec_cam_didactic_label.Show ();
                }
 
@@ -309,10 +336,7 @@ namespace LongoMatch.Gui.Component
                        // Check if the CurrentTime of the time rule is in that node
                        if (timenode.Start <= timerule.CurrentTime && timerule.CurrentTime <= timenode.Stop) {
                                // Check if we need to show the player
-                               if (!sec_cam_vbox.Visible) {
-                                       sec_cam_didactic_label.Hide ();
-                                       sec_cam_vbox.Show ();
-                               }
+                               ShowSecondaryPlayer ();
                                // Open this media file if needed
                                if (!sec_cam_playerbin.Opened ||
                                        sec_cam_playerbin.MediaFileSet.FirstOrDefault () != mediafile) {
@@ -330,7 +354,7 @@ namespace LongoMatch.Gui.Component
                                // Seek to position 
                                sec_cam_playerbin.Seek (timerule.CurrentTime, true);
                        } else {
-                               HandleOutOfScope ();
+                               ShowDidactic (DidacticMessage.CameraOutOfScope);
                        }
                }