[meld] ui.statusbar: Initial implementation of Filediff-specific status bar

[Kai Willadsen <kaiw src gnome org>]

commit f5d5b074d95a15de2ded7e4fbe3900602007f382
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Wed Jan 14 07:39:28 2015 +1000

    ui.statusbar: Initial implementation of Filediff-specific status bar

 data/ui/gedit-highlight-mode-selector.ui |   83 ++++++++++++++++++++++
 meld/ui/statusbar.py                     |  111 ++++++++++++++++++++++++++++++
 2 files changed, 194 insertions(+), 0 deletions(-)
---
diff --git a/data/ui/gedit-highlight-mode-selector.ui b/data/ui/gedit-highlight-mode-selector.ui
new file mode 100644
index 0000000..0da2ed2
--- /dev/null
+++ b/data/ui/gedit-highlight-mode-selector.ui
@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <!-- interface-requires gtk+ 3.8 -->
+  <object class="GtkListStore" id="liststore">
+    <columns>
+      <!-- column-name name -->
+      <column type="gchararray"/>
+      <!-- column-name lang -->
+      <column type="GtkSourceLanguage"/>
+    </columns>
+  </object>
+  <object class="GtkTreeModelFilter" id="treemodelfilter">
+    <property name="child_model">liststore</property>
+  </object>
+  <template class="HighlightModeSelector" parent="GtkGrid">
+    <property name="width_request">300</property>
+    <property name="height_request">400</property>
+    <property name="visible">True</property>
+    <property name="can_focus">False</property>
+    <property name="has_focus">False</property>
+    <property name="is_focus">False</property>
+    <property name="row_spacing">3</property>
+    <property name="border_width">6</property>
+    <child>
+      <object class="GtkSearchEntry" id="entry">
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="has_focus">True</property>
+        <property name="is_focus">False</property>
+        <property name="activates_default">True</property>
+        <property name="placeholder_text" translatable="yes">Search highlight mode...</property>
+      </object>
+      <packing>
+        <property name="left_attach">0</property>
+        <property name="top_attach">0</property>
+        <property name="width">1</property>
+        <property name="height">1</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkScrolledWindow" id="scrolledwindow1">
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="has_focus">False</property>
+        <property name="is_focus">False</property>
+        <property name="hexpand">True</property>
+        <property name="vexpand">True</property>
+        <property name="shadow_type">in</property>
+        <child>
+          <object class="GtkTreeView" id="treeview">
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="has_focus">False</property>
+            <property name="is_focus">False</property>
+            <property name="model">treemodelfilter</property>
+            <property name="headers_visible">False</property>
+            <property name="headers_clickable">False</property>
+            <property name="enable_search">False</property>
+            <child internal-child="selection">
+              <object class="GtkTreeSelection" id="treeview_selection"/>
+            </child>
+            <child>
+              <object class="GtkTreeViewColumn" id="treeviewcolumn">
+                <child>
+                  <object class="GtkCellRendererText" id="cellrenderertext"/>
+                  <attributes>
+                    <attribute name="text">0</attribute>
+                  </attributes>
+                </child>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+      <packing>
+        <property name="left_attach">0</property>
+        <property name="top_attach">1</property>
+        <property name="width">1</property>
+        <property name="height">1</property>
+      </packing>
+    </child>
+  </template>
+</interface>
diff --git a/meld/ui/statusbar.py b/meld/ui/statusbar.py
index feed0a5..f1f84ad 100644
--- a/meld/ui/statusbar.py
+++ b/meld/ui/statusbar.py
@@ -13,10 +13,14 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from gi.repository import GLib
 from gi.repository import GObject
 from gi.repository import Gtk
+from gi.repository import GtkSource
 from gi.repository import Pango
 
+from meld.conf import _, ui_file
+
 
 Gtk.rc_parse_string(
     """
@@ -49,8 +53,115 @@ class MeldStatusBar(Gtk.Statusbar):
         self.pack_start(alignment, True, True, 0)
         alignment.show()
 
+        self.box_box = Gtk.HBox(homogeneous=False, spacing=6)
+        self.pack_start(self.box_box, True, True, 0)
+        self.box_box.pack_end(self.construct_highlighting_selector(), False, True, 0)
+        self.box_box.show_all()
+
+    def construct_highlighting_selector(self):
+        pop = Gtk.Popover()
+        pop.set_position(Gtk.PositionType.TOP)
+        pop.add(HighlightModeSelector())
+
+        button = Gtk.MenuButton()
+        button.set_label("Foo")
+        button.set_popover(pop)
+        button.show()
+
+        return button
+
     def set_info_box(self, widgets):
         for child in self.info_box.get_children():
             self.info_box.remove(child)
         for widget in widgets:
             self.info_box.pack_end(widget, False, True, 0)
+
+
+class TemplateHackMixin(object):
+
+    def get_template_child(self, widget_type, name):
+        # Taken from an in-progress patch on bgo#701843
+
+        def get_template_child(widget, widget_type, name):
+            # Explicitly use gtk_buildable_get_name() because it is masked by
+            # gtk_widget_get_name() in GI.
+            if isinstance(widget, widget_type) and \
+                    isinstance(widget, Gtk.Buildable) and \
+                    Gtk.Buildable.get_name(widget) == name:
+                return widget
+
+            if isinstance(widget, Gtk.Container):
+                for child in widget.get_children():
+                    result = get_template_child(child, widget_type, name)
+                    if result is not None:
+                        return result
+
+        return get_template_child(self, widget_type, name)
+
+
+# HighlightModeSelector was copied and translated to Python from gedit
+# Copyright (C) 2013 - Ignacio Casal Quinteiro
+# Python translation and adaptations
+# Copyright (C) 2015 Kai Willadsen <kai willadsen gmail com>
+
+
+class HighlightModeSelector(TemplateHackMixin, Gtk.Grid):
+
+    __gtype_name__ = "HighlightModeSelector"
+
+    __gsignals__ = {
+        'language-selected': (
+            GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION,
+            None, (GtkSource.Language,)),
+    }
+
+    NAME_COLUMN, LANG_COLUMN = 0, 1
+
+    def __init__(self):
+        Gtk.Grid.__init__(self)
+        self.init_template()
+
+        self.entry = self.get_template_child(Gtk.SearchEntry, 'entry')
+        self.treeview = self.get_template_child(Gtk.TreeView, 'treeview')
+        self.treeview_selection = self.treeview.get_selection()
+        # FIXME: Should be able to access as a template child, but can't.
+        self.listfilter = self.treeview.get_model()
+        self.liststore = self.listfilter.get_model()
+
+        self.liststore.append((_("Plain Text"), None))
+        manager = GtkSource.LanguageManager()
+        for lang_id in manager.get_language_ids():
+            lang = manager.get_language(lang_id)
+            self.liststore.append((lang.get_name(), lang))
+
+        self.filter_string = ''
+        self.entry.connect('changed', self.on_entry_changed)
+        self.listfilter.set_visible_func(self.lang_name_filter)
+
+        self.entry.connect('activate', self.on_activate)
+        self.treeview.connect('row-activated', self.on_activate)
+
+    def lang_name_filter(self, model, it, *args):
+        if not self.filter_string:
+            return True
+        lang_name = model.get_value(it, self.NAME_COLUMN).lower()
+        return self.filter_string.lower() in lang_name
+
+    def on_entry_changed(self, entry):
+        self.filter_string = entry.get_text()
+        self.listfilter.refilter()
+        first = self.listfilter.get_iter_first()
+        if first:
+            self.treeview_selection.select_iter(first)
+
+    def on_activate(self, *args):
+        model, it = self.treeview_selection.get_selected()
+        if not it:
+            return
+        lang = model.get_value(it, self.LANG_COLUMN)
+        self.emit('language-selected', lang)
+
+
+template = open(ui_file('gedit-highlight-mode-selector.ui')).read()
+template_bytes = GLib.Bytes.new(template)
+HighlightModeSelector.set_template(template_bytes)