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# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import gtk
from sugar.graphics.icon import Icon
class ScrollButton(gtk.ToolButton):
def __init__(self, icon_name):
gtk.ToolButton.__init__(self)
icon = Icon(icon_name = icon_name,
icon_size=gtk.ICON_SIZE_SMALL_TOOLBAR)
# The alignment is a hack to work around gtk.ToolButton code
# that sets the icon_size when the icon_widget is a gtk.Image
alignment = gtk.Alignment(0.5, 0.5)
alignment.add(icon)
self.set_icon_widget(alignment)
class ScrolledBox(gtk.EventBox):
def __init__(self, orientation, arrows_policy = gtk.POLICY_AUTOMATIC):
gtk.EventBox.__init__(self)
self.orientation = orientation
self._viewport = None
self._abox = None
self._aviewport = None
self._aviewport_sig = None
self._arrows_policy = arrows_policy
self._left = None
self._right = None
if orientation == gtk.ORIENTATION_HORIZONTAL:
box = gtk.HBox()
else:
box = gtk.VBox()
if self._arrows_policy == gtk.POLICY_AUTOMATIC:
box.connect("size-allocate", self._box_allocate_cb)
self.add(box)
if self._arrows_policy != gtk.POLICY_NEVER:
if orientation == gtk.ORIENTATION_HORIZONTAL:
self._left = ScrollButton('go-left')
else:
self._left = ScrollButton('go-up')
self._left.connect('clicked', self._scroll_cb, 'left')
box.pack_start(self._left, False, False, 0)
self._scrolled = gtk.ScrolledWindow()
if orientation == gtk.ORIENTATION_HORIZONTAL:
self._scrolled.set_policy(arrows_policy, gtk.POLICY_NEVER)
else:
self._scrolled.set_policy(gtk.POLICY_NEVER, arrows_policy)
self._scrolled.connect('scroll-event', self._scroll_event_cb)
box.pack_start(self._scrolled, True, True, 0)
if orientation == gtk.ORIENTATION_HORIZONTAL:
self._adj = self._scrolled.get_hadjustment()
else:
self._adj = self._scrolled.get_vadjustment()
self._adj.connect('changed', self._scroll_changed_cb)
self._adj.connect('value-changed', self._scroll_changed_cb)
if self._arrows_policy != gtk.POLICY_NEVER:
if orientation == gtk.ORIENTATION_HORIZONTAL:
self._right = ScrollButton('go-right')
else:
self._right = ScrollButton('go-down')
self._right.connect('clicked', self._scroll_cb, 'right')
box.pack_start(self._right, False, False, 0)
def modify_fg(self, state, bg):
gtk.EventBox.modify_fg(self, state, bg)
self._viewport.get_parent().modify_fg(state, bg)
def modify_bg(self, state, bg):
gtk.EventBox.modify_bg(self, state, bg)
self._viewport.get_parent().modify_bg(state, bg)
def set_viewport(self, widget):
if widget == self._viewport: return
if self._viewport and self._aviewport_sig:
self._viewport.disconnect(self._aviewport_sig)
self._viewport = widget
if self._arrows_policy == gtk.POLICY_AUTOMATIC:
self._aviewport_sig = self._viewport.connect('size-allocate',
self._viewport_allocate_cb)
self._scrolled.add_with_viewport(widget)
def get_viewport_allocation(self):
alloc = self._scrolled.get_allocation()
alloc.x -= self._adj.get_value()
return alloc
def get_adjustment(self):
return self._adj
def _box_allocate_cb(self, w, a):
self._abox = a
self._update_arrows()
def _viewport_allocate_cb(self, w, a):
self._aviewport = a
self._update_arrows()
def _update_arrows(self):
if not self._abox or not self._aviewport: return
if self.orientation == gtk.ORIENTATION_HORIZONTAL:
show_flag = self._abox.width < self._aviewport.width
else:
show_flag = self._abox.height < self._aviewport.height
if show_flag:
self._left.show()
self._right.show()
else:
self._left.hide()
self._right.hide()
def _scroll_event_cb(self, widget, event):
if self.orientation == gtk.ORIENTATION_HORIZONTAL:
if event.direction == gtk.gdk.SCROLL_UP:
event.direction = gtk.gdk.SCROLL_LEFT
if event.direction == gtk.gdk.SCROLL_DOWN:
event.direction = gtk.gdk.SCROLL_RIGHT
else:
if event.direction == gtk.gdk.SCROLL_LEFT:
event.direction = gtk.gdk.SCROLL_UP
if event.direction == gtk.gdk.SCROLL_RIGHT:
event.direction = gtk.gdk.SCROLL_DOWN
return False
def _scroll_cb(self, widget, data):
if data == 'left':
val = max(self._adj.get_property('lower'), self._adj.get_value()
- self._adj.get_property('page_increment'))
else:
val = min(self._adj.get_property('upper')
- self._adj.get_property('page_size'),
self._adj.get_value()
+ self._adj.get_property('page_increment'))
self._adj.set_value(val)
def _scroll_changed_cb(self, widget):
val = self._adj.get_value()
if self._left:
if val == 0:
self._left.set_sensitive(False)
else:
self._left.set_sensitive(True)
if self._right:
if val >= self._adj.get_property('upper') - \
self._adj.get_property('page_size'):
self._right.set_sensitive(False)
else:
self._right.set_sensitive(True)
class HScrolledBox(ScrolledBox):
def __init__(self, *args):
ScrolledBox.__init__(self, gtk.ORIENTATION_HORIZONTAL, *args)
class VScrolledBox(ScrolledBox):
def __init__(self, *args):
ScrolledBox.__init__(self, gtk.ORIENTATION_VERTICAL, *args)
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