Be able to click in a tooltip - Fixes #991

This issue was reported many times, when new users see a tooltip
try to click, and are confused when there are no action.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>

src/sugar3/graphics/palette.py

@@ -22,8 +22,8 @@
 """
 STABLE.
 """
-
 from gi.repository import Gtk
+from gi.repository import Gdk
 from gi.repository import GObject
 from gi.repository import Pango
 
@@ -111,7 +111,10 @@ class Palette(PaletteWindow):
         self._icon_visible = True
         self._palette_state = self.PRIMARY
 
+        self._primary_event_box = Gtk.EventBox()
+        self._primary_event_box.show()
         self._primary_box = Gtk.HBox()
+        self._primary_event_box.add(self._primary_box)
         self._primary_box.show()
 
         self._icon_box = Gtk.HBox()
@@ -135,6 +138,9 @@ class Palette(PaletteWindow):
             self._label.set_max_width_chars(text_maxlen)
             self._label.set_ellipsize(Pango.EllipsizeMode.MIDDLE)
         labels_box.pack_start(self._label, True, True, 0)
+        self._primary_event_box.connect('button-release-event',
+                                        self.__button_release_event_cb)
+        self._primary_event_box.set_events(Gdk.EventMask.BUTTON_RELEASE_MASK)
 
         self._secondary_label = Gtk.Label()
         self._secondary_label.set_alignment(0, 0.5)
@@ -255,6 +261,10 @@ class Palette(PaletteWindow):
                                     getter=get_primary_text,
                                     setter=set_primary_text)
 
+    def __button_release_event_cb(self, widget, event):
+        if self.props.invoker is not None:
+            self.props.invoker.primary_text_clicked()
+
     def set_secondary_text(self, label):
         if label is not None:
             label = label.split('\n', 1)[0]
@@ -334,13 +344,14 @@ class Palette(PaletteWindow):
             self._setup_widget()
 
             self._palette_box = Gtk.VBox()
-            self._palette_box.pack_start(self._primary_box, False, True, 0)
+            self._palette_box.pack_start(self._primary_event_box, False, True,
+                                         0)
             self._palette_box.pack_start(self._secondary_box, True, True, 0)
 
             self._widget.add(self._palette_box)
             self._palette_box.show()
             height = style.GRID_CELL_SIZE - 2 * self._widget.get_border_width()
-            self._primary_box.set_size_request(-1, height)
+            self._primary_event_box.set_size_request(-1, height)
 
         if self._content.get_children():
             self._content.remove(self._content.get_children()[0])
@@ -405,14 +416,14 @@ class Palette(PaletteWindow):
         if self._widget is None \
                 or not isinstance(self._widget, _PaletteMenuWidget):
             if self._widget is not None:
-                self._palette_box.remove(self._primary_box)
+                self._palette_box.remove(self._primary_event_box)
                 self._palette_box.remove(self._secondary_box)
                 self._teardown_widget()
                 self._widget.destroy()
 
             self._widget = _PaletteMenuWidget()
 
-            self._label_menuitem = _HeaderItem(self._primary_box)
+            self._label_menuitem = _HeaderItem(self._primary_event_box)
             self._label_menuitem.show()
             self._widget.append(self._label_menuitem)
 

src/sugar3/graphics/palettewindow.py

@@ -1052,6 +1052,10 @@ class Invoker(GObject.GObject):
         if not self.props.cache_palette:
             self.set_palette(None)
 
+    def primary_text_clicked(self):
+        """Implemented by invokers that can be clicked"""
+        pass
+
 
 class WidgetInvoker(Invoker):
 
@@ -1345,6 +1349,9 @@ class ToolInvoker(WidgetInvoker):
         else:
             return self.LEFT + self.RIGHT
 
+    def primary_text_clicked(self):
+        self._widget.emit('clicked')
+
 
 class CellRendererInvoker(Invoker):