ui.bufferselectors: Absorb FilteredListSelector

It was mostly separate because of the template hack. Now it seems
reasonable to have all this logic together.

Author: kaiw

meld/ui/bufferselectors.py

@@ -5,13 +5,81 @@
 
 from meld.conf import _
 from meld.ui._gtktemplate import Template
-from meld.ui.listselector import FilteredListSelector
 
 # TODO: Current pygobject support for templates excludes subclassing of
 # templated classes, which is why we have two near-identical UI files
 # here, and why we can't subclass Gtk.Grid directly in
 # FilteredListSelector.
 
+
+class FilteredListSelector:
+
+    # FilteredListSelector was intially based on gedit's
+    # GeditHighlightModeSelector
+    # Copyright (C) 2013 - Ignacio Casal Quinteiro
+    # Python translation and adaptations
+    # Copyright (C) 2015, 2017 Kai Willadsen <kai.willadsen@gmail.com>
+
+    __gtype_name__ = 'FilteredListSelector'
+
+    NAME_COLUMN, VALUE_COLUMN = 0, 1
+
+    def __init__(self):
+        super().__init__()
+        self.init_template()
+
+        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.populate_model()
+        self.filter_string = ''
+        self.entry.connect('changed', self.on_entry_changed)
+        self.listfilter.set_visible_func(self.name_filter)
+
+        self.entry.connect('activate', self.on_activate)
+        self.treeview.connect('row-activated', self.on_activate)
+
+    def populate_model(self):
+        raise NotImplementedError
+
+    def select_value(self, value):
+        if not value:
+            return
+
+        new_value_getter = getattr(value, self.value_accessor)
+        for row in self.liststore:
+            row_value = row[self.VALUE_COLUMN]
+            if not row_value:
+                continue
+            old_value_getter = getattr(row_value, self.value_accessor)
+            if old_value_getter() != new_value_getter():
+                continue
+            self.treeview_selection.select_path(row.path)
+            self.treeview.scroll_to_cell(row.path, None, True, 0.5, 0)
+
+    def name_filter(self, model, it, *args):
+        if not self.filter_string:
+            return True
+        name = model.get_value(it, self.NAME_COLUMN).lower()
+        return self.filter_string.lower() in 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
+        value = model.get_value(it, self.VALUE_COLUMN)
+        self.emit(self.change_signal_name, value)
+
+
 # The subclassing here is weird; the Selector must directly subclass
 # Gtk.Grid; we can't do this on the FilteredListSelector. Likewise, the
 # Template.Child attributes must be per-class, because of how they're