[longomatch] Fix another regression on dragging.

[Andoni Morales Alastruey <amorales src gnome org>]

commit ecef223b8964eb4b4e5459730844aef19297c5fb
Author: Julien Moutte <julien fluendo com>
Date:   Wed Mar 11 15:27:28 2015 +0100

    Fix another regression on dragging.
    
    We need to be able to configure both dragging and selecting of nodes in the timeline. Achieve this 
introducing another enum.

 LongoMatch.Core/Common/Enums.cs                    |   22 ++++++++++++++++++++
 LongoMatch.Drawing/CanvasObjects/CameraObject.cs   |    3 +-
 LongoMatch.Drawing/CanvasObjects/PlayObject.cs     |    3 +-
 LongoMatch.Drawing/CanvasObjects/TimeNodeObject.cs |   21 +++++++++++++++++++
 4 files changed, 47 insertions(+), 2 deletions(-)
---
diff --git a/LongoMatch.Core/Common/Enums.cs b/LongoMatch.Core/Common/Enums.cs
index 49b0840..30a870e 100644
--- a/LongoMatch.Core/Common/Enums.cs
+++ b/LongoMatch.Core/Common/Enums.cs
@@ -178,6 +178,28 @@ namespace LongoMatch.Core.Common
                /// </summary>
                All,
        }
+
+       /// <summary>
+       /// Node dragging mode.
+       /// </summary>
+       public enum NodeDraggingMode {
+               /// <summary>
+               /// The node is not draggable at all.
+               /// </summary>
+               None,
+               /// <summary>
+               /// Only borders of the node can be dragged.
+               /// </summary>
+               Borders,
+               /// <summary>
+               /// Only the inner segment of the node can be dragged.
+               /// </summary>
+               Segment,
+               /// <summary>
+               /// Both borders and inner segment can be dragged.
+               /// </summary>
+               All,
+       }
        
        public enum SelectionPosition {
                TopLeft,
diff --git a/LongoMatch.Drawing/CanvasObjects/CameraObject.cs 
b/LongoMatch.Drawing/CanvasObjects/CameraObject.cs
index 7f07458..c6e9274 100644
--- a/LongoMatch.Drawing/CanvasObjects/CameraObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/CameraObject.cs
@@ -30,7 +30,8 @@ namespace LongoMatch.Drawing.CanvasObjects
                        base (new TimeNode () { Start = mf.Offset, Stop = mf.Duration + mf.Offset, Name = 
mf.Name })
                {
                        mediaFile = mf;
-                       SelectionMode = NodeSelectionMode.Segment;
+                       // Video boundaries can't be changed, only the segment can move.
+                       DraggingMode = NodeDraggingMode.Segment;
                }
 
                public override string Description {
diff --git a/LongoMatch.Drawing/CanvasObjects/PlayObject.cs b/LongoMatch.Drawing/CanvasObjects/PlayObject.cs
index ffe6a24..4d6ccbc 100644
--- a/LongoMatch.Drawing/CanvasObjects/PlayObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/PlayObject.cs
@@ -27,7 +27,8 @@ namespace LongoMatch.Drawing.CanvasObjects
                public PlayObject (TimelineEvent play, Project project):base (play)
                {
                        Project = project;
-                       SelectionMode = NodeSelectionMode.Borders;
+                       // Only event boundaries can be dragged
+                       DraggingMode = NodeDraggingMode.Borders;
                }
 
                public ISurface SelectionLeft {
diff --git a/LongoMatch.Drawing/CanvasObjects/TimeNodeObject.cs 
b/LongoMatch.Drawing/CanvasObjects/TimeNodeObject.cs
index 13c8aea..594f157 100644
--- a/LongoMatch.Drawing/CanvasObjects/TimeNodeObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/TimeNodeObject.cs
@@ -35,6 +35,7 @@ namespace LongoMatch.Drawing.CanvasObjects
                {
                        TimeNode = node;
                        SelectionMode = NodeSelectionMode.All;
+                       DraggingMode = NodeDraggingMode.All;
                        LineColor = Config.Style.PaletteBackgroundLight;
                }
 
@@ -61,6 +62,11 @@ namespace LongoMatch.Drawing.CanvasObjects
                        set;
                }
 
+               public NodeDraggingMode DraggingMode {
+                       get;
+                       set;
+               }
+
                public Color LineColor {
                        get;
                        set;
@@ -144,6 +150,21 @@ namespace LongoMatch.Drawing.CanvasObjects
 
                public void Move (Selection sel, Point p, Point start)
                {
+                       // Apply dragging restrictions
+                       if (DraggingMode == NodeDraggingMode.None)
+                               return;
+                       switch (sel.Position) {
+                               case SelectionPosition.Left:
+                               case SelectionPosition.Right:
+                                       if (DraggingMode == NodeDraggingMode.Segment)
+                                               return;
+                                       break;
+                               case SelectionPosition.All:
+                                       if (DraggingMode == NodeDraggingMode.Borders)
+                                               return;
+                                       break;
+                       }
+
                        Time newTime = Utils.PosToTime (p, SecondsPerPixel);
 
                        if (p.X < 0) {