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#
# Kiwi: a Framework and Enhanced Widgets for Python
#
# Copyright (C) 2005 Async Open Source
#
# 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 2.1 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
#
# Author(s): (C) Ali Afshar <aafshar@gmail.com>
#
# Contact Ali if you require release under a different license.


"""A hyper link widget."""


from cgi import escape

import gtk

from kiwi.utils import gsignal, gproperty, PropertyObject, type_register

class HyperLink(PropertyObject, gtk.EventBox):
    __gtype_name__ = 'HyperLink'
    """
    A hyperlink widget.

    This widget behaves much like a hyperlink from a browser. The markup that
    will be displayed is contained in the properties normal-markup
    hover-markup and active-markup. There is a clicked signal which is fired
    when hyperlink is clicked with the left mouse button.

    Additionally, the user may set a menu that will be popped up when the user
    right clicks the hyperlink.
    """

    gproperty('text', str, '')
    gproperty('normal-color', str, '#0000c0')
    gproperty('normal-underline', bool, False)
    gproperty('normal-bold', bool, False)
    gproperty('hover-color', str, '#0000c0')
    gproperty('hover-underline', bool, True)
    gproperty('hover-bold', bool, False)
    gproperty('active-color', str, '#c00000')
    gproperty('active-underline', bool, True)
    gproperty('active-bold', bool, False)

    gsignal('clicked')
    gsignal('right-clicked')

    def __init__(self, text=None, menu=None):
        """
        Create a new hyperlink.

        @param text: The text of the hyperlink.
        @type text: str
        """
        gtk.EventBox.__init__(self)
        self.set_above_child(False)
        self.set_visible_window(False)
        PropertyObject.__init__(self)
        self._gproperties = {}
        if text is not None:
            self.set_property('text', text)
        self._is_active = False
        self._is_hover = False
        self._menu = menu
        self._label = gtk.Label()
        self.add(self._label)
        self.add_events(gtk.gdk.BUTTON_PRESS_MASK |
                        gtk.gdk.BUTTON_RELEASE_MASK |
                        gtk.gdk.ENTER_NOTIFY_MASK |
                        gtk.gdk.LEAVE_NOTIFY_MASK)
        self.connect('button-press-event', self._on_button_press_event)
        self.connect('button-release-event', self._on_button_release_event)
        self.connect('enter-notify-event', self._on_hover_changed, True)
        self.connect('leave-notify-event', self._on_hover_changed, False)
        self.connect('map-event', self._on_map_event)
        self.connect('notify', self._on_notify)
        self.set_text(text)

    # public API

    def get_text(self):
        """
        Return the hyperlink text.
        """
        return self.text

    def set_text(self, text):
        """
        Set the text of the hyperlink.

        @param text: The text to set the hyperlink to.
        @type text: str
        """
        self.text = text
        self._update_look()

    def set_menu(self, menu):
        """
        Set the menu to be used for popups.

        @param menu: the gtk.Menu to be used.
        @type menu: gtk.Menu
        """
        self._menu = menu

    def has_menu(self):
        """
        Return whether the widget has a menu set.

        @return: a boolean value indicating whether the internal menu has been
            set.
        """
        return self._menu is not None

    def popup(self, menu=None, button=3, etime=0L):
        """
        Popup the menu and emit the popup signal.

        @param menu: The gtk.Menu to be popped up. This menu will be
            used instead of the internally set menu. If this parameter is not
            passed or None, the internal menu will be used.
        @type menu: gtk.Menu
        @param button: An integer representing the button number pressed to
            cause the popup action.
        @type button: int
        @param etime: The time that the popup event was initiated.
        @type etime: long
        """
        if menu is None:
            menu = self._menu
        if menu is not None:
            menu.popup(None, None, None, button, etime)
        self.emit('right-clicked')

    def clicked(self):
        """
        Fire a clicked signal.
        """
        self.emit('clicked')

    def get_label(self):
        """
        Get the internally stored widget.
        """
        return self._label

    # private API

    def _update_look(self):
        """
        Update the look of the hyperlink depending on state.
        """
        if self._is_active:
            state = 'active'
        elif self._is_hover:
            state = 'hover'
        else:
            state = 'normal'
        color =  self.get_property('%s-color' % state)
        underline =  self.get_property('%s-underline' % state)
        bold =  self.get_property('%s-bold' % state)
        markup_string = self._build_markup(self.get_text() or '',
                                           color, underline, bold)
        self._label.set_markup(markup_string)

    def _build_markup(self, text, color, underline, bold):
        """
        Build a marked up string depending on parameters.
        """
        out = '<span color="%s">%s</span>' % (color, escape(text))
        if underline:
            out = '<u>%s</u>' % out
        if bold:
            out = '<b>%s</b>' % out
        return out

    # signal callbacks

    def _on_button_press_event(self, eventbox, event):
        """
        Called on mouse down.

        Behaves in 2 ways.
            1. if left-button, register the start of a click and grab the
                mouse.
            1. if right-button, emit a right-clicked signal +/- popup the
                menu.
        """
        if event.button == 1:
            self.grab_add()
            self._is_active = True
            self._update_look()
        elif event.button == 3:
            if event.type == gtk.gdk.BUTTON_PRESS:
                self.popup(button=event.button, etime=event.time)

    def _on_button_release_event(self, eventbox, event):
        """
        Called on mouse up.

        If the left-button is released and the widget was earlier activated by
        a mouse down event a clicked signal is fired.
        """
        if event.button == 1:
            self.grab_remove()
            if self._is_active:
                self.clicked()
                self._is_active = False
                self._update_look()

    def _on_hover_changed(self, eb, event, hover):
        """
        Called when the mouse pinter enters or leaves the widget.

        @param hover: Whether the mouse has entered the widget.
        @type hover: boolean
        """
        self._is_hover = hover
        self._update_look()

    def _on_notify(self, eventbox, param):
        """
        Called on property notification.

        Ensure that the look is up to date with the properties
        """
        if (param.name == 'text' or
            param.name.endswith('-color') or
            param.name.endswith('-underline') or
            param.name.endswith('-bold')):
            self._update_look()

    def _on_map_event(self, eventbox, event):
        """
        Called on initially mapping the widget.

        Used here to set the cursor type.
        """
        cursor = gtk.gdk.Cursor(gtk.gdk.HAND1)
        self.window.set_cursor(cursor)

type_register(HyperLink)