[gitg] diff-view-file: propagate has-selection property

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 888db44f1e1e7298e2d9bb5a524411a139c64134
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Fri Dec 18 15:46:23 2015 +0100

    diff-view-file: propagate has-selection property

 libgitg/gitg-diff-view-file.vala |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)
---
diff --git a/libgitg/gitg-diff-view-file.vala b/libgitg/gitg-diff-view-file.vala
index 430a2b2..617eeb9 100644
--- a/libgitg/gitg-diff-view-file.vala
+++ b/libgitg/gitg-diff-view-file.vala
@@ -80,6 +80,13 @@ class Gitg.DiffViewFile : Gtk.Grid
                get; set;
        }
 
+       private bool d_has_selection;
+
+       public bool has_selection
+       {
+               get { return d_has_selection; }
+       }
+
        public Ggit.DiffDelta delta
        {
                get;
@@ -123,6 +130,26 @@ class Gitg.DiffViewFile : Gtk.Grid
                d_expander.bind_property("expanded", this, "expanded", BindingFlags.BIDIRECTIONAL);
        }
 
+       private void on_selection_changed()
+       {
+               bool something_selected = false;
+
+               foreach (var child in d_grid_hunks.get_children())
+               {
+                       if ((child as Gitg.DiffViewHunk).has_selection)
+                       {
+                               something_selected = true;
+                               break;
+                       }
+               }
+
+               if (d_has_selection != something_selected)
+               {
+                       d_has_selection = something_selected;
+                       notify_property("has-selection");
+               }
+       }
+
        public void add_hunk(Ggit.DiffHunk hunk, Gee.ArrayList<Ggit.DiffLine> lines)
        {
                var widget = new Gitg.DiffViewHunk(hunk, lines, handle_selection);
@@ -137,6 +164,8 @@ class Gitg.DiffViewFile : Gtk.Grid
                this.bind_property("wrap", widget, "wrap", BindingFlags.DEFAULT | BindingFlags.SYNC_CREATE);
                this.bind_property("tab-width", widget, "tab-width", BindingFlags.DEFAULT | 
BindingFlags.SYNC_CREATE);
 
+               widget.notify["has-selection"].connect(on_selection_changed);
+
                sensitive = true;
        }
 }