sugar-toolkit-gtk3/src/sugar/graphics/palette.py

# Copyright (C) 2007, Eduardo Silva <edsiper@gmail.com>
# Copyright (C) 2008, One Laptop Per Child
# Copyright (C) 2009, Tomeu Vizoso
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

"""
STABLE.
"""

import logging

import gtk
import gobject
import hippo
import pango

from sugar.graphics import palettegroup
from sugar.graphics import animator
from sugar.graphics import style
from sugar.graphics.icon import Icon
from sugar.graphics.palettewindow import PaletteWindow
from sugar import _sugarext

# DEPRECATED
# Import these for backwards compatibility
from sugar.graphics.palettewindow import MouseSpeedDetector, Invoker, \
        WidgetInvoker, CanvasInvoker, ToolInvoker, CellRendererInvoker

class Palette(PaletteWindow):
    PRIMARY = 0
    SECONDARY = 1

    __gtype_name__ = 'SugarPalette'

    # DEPRECATED: label is passed with the primary-text property, accel_path 
    # is set via the invoker property, and menu_after_content is not used
    def __init__(self, label=None, accel_path=None, menu_after_content=False,
                 text_maxlen=60, **kwargs):

        self._primary_text = None
        self._secondary_text = None
        self._icon = None
        self._icon_visible = True
        self._palette_state = self.PRIMARY

        palette_box = gtk.VBox()

        primary_box = gtk.HBox()
        palette_box.pack_start(primary_box, expand=False)
        primary_box.show()

        self._icon_box = gtk.HBox()
        self._icon_box.set_size_request(style.GRID_CELL_SIZE, -1)
        primary_box.pack_start(self._icon_box, expand=False)

        labels_box = gtk.VBox()
        self._label_alignment = gtk.Alignment(xalign=0, yalign=0.5, 
                                              xscale=1, yscale=0.33)
        self._label_alignment.set_padding(0, 0, style.DEFAULT_SPACING, 
                                          style.DEFAULT_SPACING)
        self._label_alignment.add(labels_box)
        self._label_alignment.show()
        primary_box.pack_start(self._label_alignment, expand=True)
        labels_box.show()

        self._label = gtk.AccelLabel('')
        self._label.set_alignment(0, 0.5)

        if text_maxlen > 0:
            self._label.set_max_width_chars(text_maxlen)
            self._label.set_ellipsize(pango.ELLIPSIZE_MIDDLE)
        labels_box.pack_start(self._label, expand=True)

        self._secondary_label = gtk.Label()
        self._secondary_label.set_alignment(0, 0.5)

        if text_maxlen > 0:
            self._secondary_label.set_max_width_chars(text_maxlen)
            self._secondary_label.set_ellipsize(pango.ELLIPSIZE_END)

        labels_box.pack_start(self._secondary_label, expand=True)

        self._secondary_box = gtk.VBox()
        palette_box.pack_start(self._secondary_box)

        self._separator = gtk.HSeparator()
        self._secondary_box.pack_start(self._separator)

        self._menu_content_separator = gtk.HSeparator()

        self._secondary_anim = animator.Animator(2.0, 10)
        self._secondary_anim.add(_SecondaryAnimation(self))

        # we init after initializing all of our containers
        PaletteWindow.__init__(self, **kwargs)

        primary_box.set_size_request(-1, style.GRID_CELL_SIZE
                                     - 2 * self.get_border_width())

        self._full_request = [0, 0]
        self._menu_box = None
        self._content = None

        # we set these for backward compatibility
        if label is not None:
            self.props.primary_text = label

        self._add_menu()
        self._secondary_box.pack_start(self._menu_content_separator)
        self._add_content()

        self.action_bar = PaletteActionBar()
        self._secondary_box.pack_start(self.action_bar)
        self.action_bar.show()

        self.add(palette_box)
        palette_box.show()

        # The menu is not shown here until an item is added
        self.menu = _Menu(self)
        self.menu.connect('item-inserted', self.__menu_item_inserted_cb)

        self.connect('realize', self.__realize_cb)
        self.connect('show', self.__show_cb)
        self.connect('hide', self.__hide_cb)
        self.connect('notify::invoker', self.__notify_invoker_cb)
        self.connect('destroy', self.__destroy_cb)

    def _invoker_right_click_cb(self, invoker):
        self.popup(immediate=True, state=self.SECONDARY)

    def do_style_set(self, previous_style):
        # Prevent a warning from pygtk
        if previous_style is not None:
            gtk.Window.do_style_set(self, previous_style)
        self.set_border_width(self.get_style().xthickness)

    def __menu_item_inserted_cb(self, menu):
        self._update_separators()

    def __destroy_cb(self, palette):
        # Break the reference cycle. It looks like the gc is not able to free
        # it, possibly because gtk.Menu memory handling is very special.
        self.menu = None

    def __show_cb(self, widget):
        self.menu.set_active(True)

    def __hide_cb(self, widget):
        logging.debug('__hide_cb')
        self.menu.set_active(False)
        self._secondary_anim.stop()

    def __notify_invoker_cb(self, palette, pspec):
        invoker = self.props.invoker
        if invoker is not None and hasattr(invoker.props, 'widget'):
            self._update_accel_widget()
            self._invoker.connect('notify::widget',
                                  self.__invoker_widget_changed_cb)

    def __invoker_widget_changed_cb(self, invoker, spec):
        self._update_accel_widget()

    def get_full_size_request(self):
        return self._full_request

    def popup(self, immediate=False, state=None):
        logging.debug('Palette.popup immediate %r' % immediate)

        if self._invoker is not None:
            self._update_full_request()
    
        PaletteWindow.popup(self, immediate)

        if state is None:
            state = self.PRIMARY
        self.set_palette_state(state)

        self._secondary_anim.start()

    def on_enter(self, event):
        PaletteWindow.on_enter(self, event)
        self._secondary_anim.start()
        
    def _add_menu(self):
        self._menu_box = gtk.VBox()
        self._secondary_box.pack_start(self._menu_box)
        self._menu_box.show()

    def _add_content(self):
        # The content is not shown until a widget is added
        self._content = gtk.VBox()
        self._content.set_border_width(style.DEFAULT_SPACING)
        self._secondary_box.pack_start(self._content)

    def _update_accel_widget(self):
        assert self.props.invoker is not None
        self._label.props.accel_widget = self.props.invoker.props.widget

    def set_primary_text(self, label, accel_path=None):
        self._primary_text = label

        if label is not None:
            self._label.set_markup('<b>%s</b>' % label)
            self._label.show()

    def get_primary_text(self):
        return self._primary_text

    primary_text = gobject.property(type=str,
                                    getter=get_primary_text,
                                    setter=set_primary_text)

    def set_secondary_text(self, label):
        if label is not None:
            label = label.split('\n', 1)[0]
        self._secondary_text = label

        if label is None:
            self._secondary_label.hide()
        else:
            self._secondary_label.set_text(label)
            self._secondary_label.show()

    def get_secondary_text(self):
        return self._secondary_text


    secondary_text = gobject.property(type=str,
                                      getter=get_secondary_text,
                                      setter=set_secondary_text)
    def _show_icon(self):
        self._label_alignment.set_padding(0, 0, 0, style.DEFAULT_SPACING)
        self._icon_box.show()

    def _hide_icon(self):
        self._icon_box.hide()
        self._label_alignment.set_padding(0, 0, style.DEFAULT_SPACING,
                                          style.DEFAULT_SPACING)

    def set_icon(self, icon):
        if icon is None:
            self._icon = None
            self._hide_icon()
        else:
            if self._icon:
                self._icon_box.remove(self._icon_box.get_children()[0])

            event_box = gtk.EventBox()
            event_box.connect('button-release-event',
                              self.__icon_button_release_event_cb)
            self._icon_box.pack_start(event_box)
            event_box.show()

            self._icon = icon
            self._icon.props.icon_size = gtk.ICON_SIZE_LARGE_TOOLBAR
            event_box.add(self._icon)
            self._icon.show()
            self._show_icon()

    def get_icon(self):
        return self._icon

    icon = gobject.property(type=object, getter=get_icon, setter=set_icon)

    def __icon_button_release_event_cb(self, icon, event):
        self.emit('activate')

    def set_icon_visible(self, visible):
        self._icon_visible = visible

        if visible and self._icon is not None:
            self._show_icon()
        else:
            self._hide_icon()

    def get_icon_visible(self):
        return self._icon_visilbe

    icon_visible = gobject.property(type=bool,
                                    default=True,
                                    getter=get_icon_visible,
                                    setter=set_icon_visible)

    def set_content(self, widget):
        if len(self._content.get_children()) > 0:
            self._content.remove(self._content.get_children()[0])

        if widget is not None:
            self._content.add(widget)
            self._content.show()
        else:
            self._content.hide()

        self._update_accept_focus()
        self._update_separators()

    def do_size_request(self, requisition):
        PaletteWindow.do_size_request(self, requisition)

        # gtk.AccelLabel request doesn't include the accelerator.
        label_width = self._label_alignment.size_request()[0] + \
                      self._label.get_accel_width() + \
                      2 * self.get_border_width()

        requisition.width = max(requisition.width,
                                label_width,
                                self._full_request[0])

    def _update_separators(self):
        visible = len(self.menu.get_children()) > 0 or  \
                  len(self._content.get_children()) > 0
        self._separator.props.visible = visible

        visible = len(self.menu.get_children()) > 0 and  \
                  len(self._content.get_children()) > 0
        self._menu_content_separator.props.visible = visible

    def _update_accept_focus(self):
        accept_focus = len(self._content.get_children())
        if self.window:
            self.window.set_accept_focus(accept_focus)

    def __realize_cb(self, widget):
        self._update_accept_focus()

    def _update_full_request(self):
        if self._palette_state == self.PRIMARY:
            self.menu.embed(self._menu_box)
            self._secondary_box.show()

        self._full_request = self.size_request()

        if self._palette_state == self.PRIMARY:
            self.menu.unembed()
            self._secondary_box.hide()

    def _set_palette_state(self, state):
        if self._palette_state == state:
            return

        if state == self.PRIMARY:
            self.menu.unembed()
            self._secondary_box.hide()
        elif state == self.SECONDARY:
            self.menu.embed(self._menu_box)
            self._secondary_box.show()
            self.update_position()

        self._palette_state = state

class PaletteActionBar(gtk.HButtonBox):
    def add_action(self, label, icon_name=None):
        button = gtk.Button(label)

        if icon_name:
            icon = Icon(icon_name)
            button.set_image(icon)
            icon.show()

        self.pack_start(button)
        button.show()

class _Menu(_sugarext.Menu):
    __gtype_name__ = 'SugarPaletteMenu'

    __gsignals__ = {
        'item-inserted': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([]))
    }

    def __init__(self, palette):
        _sugarext.Menu.__init__(self)
        self._palette = palette

    def do_insert(self, item, position):
        _sugarext.Menu.do_insert(self, item, position)
        self.emit('item-inserted')
        self.show()

    def attach(self, child, left_attach, right_attach,
               top_attach, bottom_attach):
        _sugarext.Menu.attach(self, child, left_attach, right_attach,
                              top_attach, bottom_attach)
        self.emit('item-inserted')
        self.show()

    def do_expose_event(self, event):
        # Ignore the Menu expose, just do the MenuShell expose to prevent any
        # border from being drawn here. A border is drawn by the palette object
        # around everything.
        gtk.MenuShell.do_expose_event(self, event)

    def do_grab_notify(self, was_grabbed):
        # Ignore grab_notify as the menu would close otherwise
        pass

    def do_deactivate(self):
        self._palette.hide()

class _SecondaryAnimation(animator.Animation):
    def __init__(self, palette):
        animator.Animation.__init__(self, 0.0, 1.0)
        self._palette = palette

    def next_frame(self, current):
        if current == 1.0:
            self._palette.set_palette_state(Palette.SECONDARY)