sugar-toolkit-gtk3/src/sugar3/graphics/alert.py

"""
Alerts appear at the top of the body of your activity.

At a high level, Alert and its different variations (TimeoutAlert,
ConfirmationAlert, etc.) have a title, an alert message and then several
buttons that the user can click. The Alert class will pass "response" events
to your activity when any of these buttons are clicked, along with a
response_id to help you identify what button was clicked.

Example:
    Create a simple alert message.

    .. code-block:: python

        from sugar3.graphics.alert import Alert

        # Create a new simple alert
        alert = Alert()
        # Populate the title and text body of the alert.
        alert.props.title = _('Title of Alert Goes Here')
        alert.props.msg = _('Text message of alert goes here')
        # Call the add_alert() method (inherited via the sugar3.graphics.Window
        # superclass of Activity) to add this alert to the activity window.
        self.add_alert(alert)
        alert.show()

STABLE.
"""
# Copyright (C) 2007, One Laptop Per Child
# Copyright (C) 2010, Anish Mangal <anishmangal2002@gmail.com>
#
# 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.

import gettext

from gi.repository import Gtk
from gi.repository import GObject
from gi.repository import GLib
import math

from sugar3.graphics import style
from sugar3.graphics.icon import Icon


_ = lambda msg: gettext.dgettext('sugar-toolkit-gtk3', msg)


class Alert(Gtk.EventBox):
    """
    UI interface for Alerts

    Alerts are used inside the activity window instead of being a
    separate popup window. They do not hide canvas content. You can
    use `add_alert()` and `remove_alert()` inside your activity
    to add and remove the alert. The position of the alert is below the
    toolbox or top in fullscreen mode.

    Args:
        title (str): the title of the alert
        message (str): the message of the alert
        icon (str): the icon that appears at the far left
    """
    __gtype_name__ = 'SugarAlert'

    __gsignals__ = {
        'response': (GObject.SignalFlags.RUN_FIRST, None, ([object])),
    }

    __gproperties__ = {
        'title': (str, None, None, None, GObject.PARAM_READWRITE),
        'msg': (str, None, None, None, GObject.PARAM_READWRITE),
        'icon': (object, None, None, GObject.PARAM_WRITABLE),
    }

    def __init__(self, **kwargs):
        self._title = None
        self._msg = None
        self._icon = None
        self._buttons = {}

        self._hbox = Gtk.HBox()
        self._hbox.set_border_width(style.DEFAULT_SPACING)
        self._hbox.set_spacing(style.DEFAULT_SPACING)

        self._msg_box = Gtk.VBox()
        self._title_label = Gtk.Label()
        self._title_label.set_alignment(0, 0.5)
        self._title_label.set_ellipsize(style.ELLIPSIZE_MODE_DEFAULT)
        self._msg_box.pack_start(self._title_label, False, False, 0)

        self._msg_label = Gtk.Label()
        self._msg_label.set_alignment(0, 0.5)
        self._msg_label.set_ellipsize(style.ELLIPSIZE_MODE_DEFAULT)
        self._msg_box.pack_start(self._msg_label, False, False, 0)
        self._hbox.pack_start(self._msg_box, False, False, 0)

        self._buttons_box = Gtk.HButtonBox()
        self._buttons_box.set_layout(Gtk.ButtonBoxStyle.END)
        self._buttons_box.set_spacing(style.DEFAULT_SPACING)
        self._hbox.pack_end(self._buttons_box, True, True, 0)

        GObject.GObject.__init__(self, **kwargs)

        self.set_visible_window(True)
        self.add(self._hbox)
        self._title_label.show()
        self._msg_label.show()
        self._buttons_box.show()
        self._msg_box.show()
        self._hbox.show()
        self.show()

    def do_set_property(self, pspec, value):
        """
        Set alert property, GObject internal method.
        Use the `alert.props` object, eg::

            alert.props.title = 'Are you happy?'
        """
        if pspec.name == 'title':
            if self._title != value:
                self._title = value
                self._title_label.set_markup('<b>' + self._title + '</b>')
        elif pspec.name == 'msg':
            if self._msg != value:
                self._msg = value
                self._msg_label.set_markup(self._msg)
                self._msg_label.set_line_wrap(True)
        elif pspec.name == 'icon':
            if self._icon != value:
                self._icon = value
                self._hbox.pack_start(self._icon, False, False, 0)
                self._hbox.reorder_child(self._icon, 0)

    def do_get_property(self, pspec):
        """
        Get alert property, GObject internal method.
        Use the `alert.props` object, eg::

            title = alert.props.title
        """
        if pspec.name == 'title':
            return self._title
        elif pspec.name == 'msg':
            return self._msg

    def add_entry(self):
        """
        Add an entry, after the title and before the buttons.

        Returns:
            Gtk.Entry: the entry added to the alert
        """
        entry = Gtk.Entry()
        self._hbox.pack_start(entry, True, True, 0)
        entry.show()

        self._hbox.set_child_packing(self._buttons_box, False, False, 0,
                                     Gtk.PackType.END)

        return entry

    def add_button(self, response_id, label, icon=None, position=-1):
        """
        Add a button to the alert

        Args:
            response_id (int): will be emitted with the response signal a
                response ID should one of the pre-defined GTK Response Type
                Constants or a positive number
            label (str): that will occure right to the buttom
            icon (:class:`sugar3.graphics.icon.Icon` or :class:`Gtk.Image`, optional):
                icon for the button, placed before the text
            postion (int, optional): the position of the button in the box

        Returns:
            Gtk.Button: the button added to the alert

        """
        button = Gtk.Button()
        self._buttons[response_id] = button
        if icon is not None:
            button.set_image(icon)
        button.set_label(label)
        self._buttons_box.pack_start(button, True, True, 0)
        button.show()
        button.connect('clicked', self.__button_clicked_cb, response_id)
        if position != -1:
            self._buttons_box.reorder_child(button, position)
        return button

    def remove_button(self, response_id):
        """
        Remove a button from the alert by the given response id

        Args:
            response_id (int): the same response id passed to add_button

        Returns:
            None

        """
        self._buttons_box.remove(self._buttons[response_id])

    def _response(self, response_id):
        """
        Emitting response when we have a result

        A result can be that a user has clicked a button or
        a timeout has occured, the id identifies the button
        that has been clicked and -1 for a timeout
        """
        self.emit('response', response_id)

    def __button_clicked_cb(self, button, response_id):
        self._response(response_id)
if hasattr(Alert, 'set_css_name'):
    Alert.set_css_name('alert')


class ConfirmationAlert(Alert):
    """
    This is a ready-made two button (Cancel, Ok) alert.

    A confirmation alert is a nice shortcut from a standard Alert because it
    comes with 'OK' and 'Cancel' buttons already built-in. When clicked, the
    'OK' button will emit a response with a response_id of
    :class:`Gtk.ResponseType.OK`, while the 'Cancel' button will emit
    :class:`Gtk.ResponseType.CANCEL`.

    Args:
        **kwargs: options for :class:`sugar3.graphics.alert.Alert`

    .. code-block:: python

        from sugar3.graphics.alert import ConfirmationAlert

        # Create a Confirmation alert (with ok and cancel buttons standard)
        # then add it to the UI.
        def _alert_confirmation(self):
            alert = ConfirmationAlert()
            alert.props.title=_('Title of Alert Goes Here')
            alert.props.msg = _('Text message of alert goes here')
            alert.connect('response', self._alert_response_cb)
            self.add_alert(alert)

        # Called when an alert object throws a response event.
        def _alert_response_cb(self, alert, response_id):
            # Remove the alert from the screen, since either a response button
            # was clicked or there was a timeout
            self.remove_alert(alert)

            # Do any work that is specific to the type of button clicked.
            if response_id is Gtk.ResponseType.OK:
                print 'Ok Button was clicked. Do any work upon ok here ...'
            elif response_id is Gtk.ResponseType.CANCEL:
                print 'Cancel Button was clicked.'
    """

    def __init__(self, **kwargs):
        Alert.__init__(self, **kwargs)

        icon = Icon(icon_name='dialog-cancel')
        self.add_button(Gtk.ResponseType.CANCEL, _('Cancel'), icon)
        icon.show()

        icon = Icon(icon_name='dialog-ok')
        self.add_button(Gtk.ResponseType.OK, _('Ok'), icon)
        icon.show()


class ErrorAlert(Alert):
    """
    This is a ready-made one button (Ok) alert.

    An error alert is a nice shortcut from a standard Alert because it
    comes with the 'OK' button already built-in. When clicked, the
    'OK' button will emit a response with a response_id of
    :class:`Gtk.ResponseType.OK`.

    Args:
        **kwargs: options for :class:`sugar3.graphics.alert.Alert`

    .. code-block:: python

        from sugar3.graphics.alert import ErrorAlert

        # Create a Error alert (with ok button standard)
        # and add it to the UI.
        def _alert_error(self):
            alert = ErrorAlert()
            alert.props.title=_('Title of Alert Goes Here')
            alert.props.msg = _('Text message of alert goes here')
            alert.connect('response', self._alert_response_cb)
            self.add_alert(alert)

        # called when an alert object throws a response event.
        def _alert_response_cb(self, alert, response_id):
            # Remove the alert from the screen, since either a response button
            # was clicked or there was a timeout
            self.remove_alert(alert)

            # Do any work that is specific to the response_id.
            if response_id is Gtk.ResponseType.OK:
                print 'Ok Button was clicked. Do any work upon ok here'
    """

    def __init__(self, **kwargs):
        Alert.__init__(self, **kwargs)

        icon = Icon(icon_name='dialog-ok')
        self.add_button(Gtk.ResponseType.OK, _('Ok'), icon)
        icon.show()


class _TimeoutIcon(Gtk.Alignment):
    __gtype_name__ = 'SugarTimeoutIcon'

    def __init__(self):
        Gtk.Alignment.__init__(self, xalign=0, yalign=0, xscale=1, yscale=1)
        self.set_app_paintable(True)
        self._text = Gtk.Label()
        self._text.set_alignment(0.5, 0.5)
        self.add(self._text)
        self._text.show()
        self.connect('draw', self.__draw_cb)

    def __draw_cb(self, widget, context):
        self._draw(context)
        return False

    def do_get_preferred_width(self):
        width = Gtk.icon_size_lookup(Gtk.IconSize.BUTTON)[1]
        return width, width

    def do_get_preferred_height(self):
        height = Gtk.icon_size_lookup(Gtk.IconSize.BUTTON)[2]
        return height, height

    def _draw(self, context):
        w = self.get_allocated_width()
        h = self.get_allocated_height()
        x = w * 0.5
        y = h * 0.5
        radius = w / 2
        context.arc(x, y, radius, 0, 2 * math.pi)
        widget_style = self.get_style_context()
        color = widget_style.get_background_color(self.get_state_flags())
        context.set_source_rgb(color.red, color.green, color.blue)
        context.fill_preserve()

    def set_text(self, text):
        self._text.set_markup('<b>%s</b>' % GLib.markup_escape_text(str(text)))
if hasattr(_TimeoutIcon, 'set_css_name'):
    _TimeoutIcon.set_css_name('timeouticon')


class _TimeoutAlert(Alert):
    def __init__(self, timeout=5, label=_('Ok'), **kwargs):
        Alert.__init__(self, **kwargs)

        self._timeout = timeout

        self._timeout_text = _TimeoutIcon()
        self._timeout_text.set_text(self._timeout)
        self.add_button(Gtk.ResponseType.OK, label, self._timeout_text)
        self._timeout_text.show()

        self._timeout_sid = GLib.timeout_add(1000, self.__timeout_cb)

    def __timeout_cb(self):
        self._timeout -= 1
        self._timeout_text.set_text(self._timeout)
        if self._timeout == 0:
            Alert._response(self, Gtk.ResponseType.OK)
            return False
        return True

    def _response(self, *args):
        GLib.source_remove(self._timeout_sid)
        Alert._response(self, *args)


class TimeoutAlert(_TimeoutAlert):
    """
    This is a ready-made two button (Continue, Cancel) alert.  The continue
    button contains a visual countdown indicating the time remaining to the
    user.  If the user does not select a button before the timeout, the
    response callback is called and the alert is usually removed.

    Args:
        timeout (int, optional): the length in seconds for the timeout to
            last, defaults to 5 seconds
        **kwargs: options for :class:`sugar3.graphics.alert.Alert`

    .. code-block:: python

        from sugar3.graphics.alert import TimeoutAlert

        # Create a Timeout alert (with ok and cancel buttons standard) then
        # add it to the UI
        def _alert_timeout(self):
            # Notice that for a TimeoutAlert, you pass the number of seconds
            # in which to timeout. By default, this is 5.
            alert = TimeoutAlert(10)
            alert.props.title = _('Title of Alert Goes Here')
            alert.props.msg = _('Text message of timeout alert goes here')
            alert.connect('response', self.__alert_response_cb)
            self.add_alert(alert)

        # Called when an alert object throws a response event.
        def __alert_response_cb(self, alert, response_id):
            # Remove the alert from the screen, since either a response button
            # was clicked or there was a timeout
            self.remove_alert(alert)

            # Do any work that is specific to the type of button clicked.
            if response_id is Gtk.ResponseType.OK:
                print 'Ok Button was clicked. Do any work upon ok here ...'
            elif response_id is Gtk.ResponseType.CANCEL:
                print 'Cancel Button was clicked.'
            elif response_id == -1:
                print 'Timeout occurred'
    """

    def __init__(self, timeout=5, **kwargs):
        _TimeoutAlert.__init__(self, timeout, _('Continue'), **kwargs)

        icon = Icon(icon_name='dialog-cancel')
        self.add_button(Gtk.ResponseType.CANCEL, _('Cancel'), icon)
        icon.show()


class NotifyAlert(_TimeoutAlert):
    """
    Timeout alert with only an "OK" button.  This should be used just for
    notifications and not for user interaction.  The alert will timeout after
    a given length, similar to a :class:`sugar3.graphics.alert.TimeoutAlert`.

    Args:
        timeout (int, optional): the length in seconds for the timeout to
            last, defaults to 5 seconds
        **kwargs: options for :class:`sugar3.graphics.alert.Alert`

    .. code-block:: python

        from sugar3.graphics.alert import NotifyAlert

        # create a Notify alert (with only an 'OK' button) then show it
        def _alert_notify(self):
            alert = NotifyAlert()
            alert.props.title = _('Title of Alert Goes Here')
            alert.props.msg = _('Text message of notify alert goes here')
            alert.connect('response', self._alert_response_cb)
            self.add_alert(alert)

        def __alert_response_cb(self, alert, response_id):
            # Hide the alert from the user
            self.remove_alert(alert)

            assert response_id == Gtk.ResponseType.OK
    """

    def __init__(self, timeout=5, **kwargs):
        _TimeoutAlert.__init__(self, timeout, _('Ok'), **kwargs)