/usr/lib/python2.7/dist-packages/enable/scrollbar.py is in python-enable 4.3.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Define a standard horizontal and vertical Enable 'scrollbar' component.
The scrollbar uses images for the pieces of the scrollbar itself and stretches
them appropriately in the draw phase.
"""
from __future__ import with_statement
# PZW: Define a scrollbar that uses the system/wx-native scrollbar instead
# of drawing our own.
from types import TupleType
from traits.api import Event, Property, Trait, TraitError
from traitsui.api import Group, View
# Relative imports
from component import Component
from enable_traits import layout_style_trait
#------------------------------------------------------------------------------
# Constants:
#------------------------------------------------------------------------------
# Scroll bar zones:
NO_SCROLL = -1
LINE_UP = 0
PAGE_UP = 1
LINE_DOWN = 2
PAGE_DOWN = 3
SLIDER = 4
# Scrollbar suffix names by zone:
zone_suffixes = [ '_line_up_suffix', '', '_line_down_suffix', '',
'_slider_suffix' ]
# Scroll information look-up table:
scroll_info = [ ( 'line_up', 1.0, 3 ),
( 'page_up', 1.0, 2 ),
( 'line_down', -1.0, 3 ),
( 'page_down', -1.0, 2 ) ]
# Scroll bar images and sizes:
sb_image = {}
v_width = 0
v_height = 0
vs_height = 0
h_width = 0
h_height = 0
hs_width = 0
#------------------------------------------------------------------------------
# Traits validators
#------------------------------------------------------------------------------
def valid_range ( object, name, value ):
"Verify that a set of range values for a scrollbar is valid"
try:
if (type( value ) is TupleType) and (len( value ) == 4):
low, high, page_size, line_size = value
if high < low:
low, high = high, low
elif high == low:
high = low + 1.0
page_size = max( min( page_size, high - low ), 0.0 )
line_size = max( min( line_size, page_size ), 0.0 )
return ( float( low ), float( high ),
float( page_size ), float( line_size ) )
except:
pass
raise TraitError
valid_range.info = 'a (low,high,page_size,line_size) range tuple'
def valid_position ( object, name, value ):
"Verify that a specified scroll bar position is valid"
try:
low, high, page_size, line_size = object.range
return max( min( float( value ), high - page_size ), low )
except:
pass
raise TraitError
class ScrollBar ( Component ):
position = Trait( 0.0, valid_position )
range = Trait( ( 0.0, 100.0, 10.0, 1.0 ), valid_range )
style = layout_style_trait
line_up = Event
line_down = Event
page_up = Event
page_down = Event
scroll_done = Event
traits_view = View( Group( '<component>', id = 'component' ),
Group( '<links>', id = 'links' ),
Group( 'style', ' ', 'position', 'low', 'high',
'page_size', 'line_size',
id = 'scrollbar',
style = 'custom' ) )
#---------------------------------------------------------------------------
# Property definitions:
#---------------------------------------------------------------------------
def __low_get(self):
return self.range[0]
def __low_set(self, low):
ignore, high, page_size, line_size = self.range
self.range =(low, high, page_size, line_size)
return
def __high_get(self):
return self.range[1]
def __high_set(self, high):
low, ignore, page_size, line_size = self.range
self.range =(low, high, page_size, line_size)
def __page_size_get(self):
return self.range[2]
def __page_size_set(self, page_size):
low, high, ignore, line_size = self.range
self.range =(low, high, page_size, line_size)
def __line_size_get(self):
return self.range[3]
def __line_size_set(self, line_size):
low, high, page_size, ignore = self.range
self.range =(low, high, page_size, line_size)
# Define 'position, low, high, page_size' properties:
low = Property( __low_get, __low_set)
high = Property( __high_get, __high_set)
page_size = Property( __page_size_get, __page_size_set)
line_size = Property( __line_size_get, __line_size_set)
def __init__(self, **traits):
if v_width == 0:
self._init_images()
Component.__init__(self, **traits)
self._scrolling = self._zone = NO_SCROLL
self._line_up_suffix = self._line_down_suffix = self._slider_suffix = ''
self._style_changed(self.style)
return
def _init_images(self):
"One time initialization of the scrollbar images"
global sb_image, v_width, v_height, vs_height, h_width, h_height, \
hs_width
for name in [ 'aup' , 'adown', 'aleft', 'aright',
'vtop', 'vbottom', 'vmid', 'vpad',
'hleft', 'hright', 'hmid', 'hpad' ]:
sb_image[ name ] = self.image_for('=sb_%s' % name)
sb_image[ name + '_over' ] = self.image_for('=sb_%s_over' % name)
sb_image[ name + '_down' ] = self.image_for('=sb_%s_down' % name)
sb_image[ 'vtrack' ] = self.image_for('=sb_vtrack')
sb_image[ 'htrack' ] = self.image_for('=sb_htrack')
v_width = sb_image[ 'vtrack' ].width()
vs_height = reduce(lambda a, b: a + sb_image[b].height(),
[ 'vtop', 'vbottom', 'vmid' ], 0)
v_height = reduce(lambda a, b: a + sb_image[b].height(),
[ 'aup', 'adown' ], vs_height)
hs_width = reduce(lambda a, b: a + sb_image[b].width(),
[ 'hleft', 'hright', 'hmid' ], 0)
h_width = reduce(lambda a, b: a + sb_image[b].width(),
[ 'aleft', 'aright' ], hs_width)
h_height = sb_image[ 'htrack' ].height()
return
def _range_changed(self):
"Handle any of the range elements values being changed"
low, high, page_size, line_size = self.range
self.position = max(min(self.position, high - page_size), low)
self.redraw()
return
def _position_changed(self):
self.redraw()
return
def _style_changed(self, style):
"Handle the orientation style being changed"
if style[0] == 'v':
self.min_width = self.max_width = v_width
self.min_height = v_height
self.max_height = 99999.0
self.stretch_width = 0.0
self.stretch_height = 1.0
else:
self.min_width = h_width
self.max_width = 99999.0
self.min_height = self.max_height = h_height
self.stretch_width = 1.0
self.stretch_height = 0.0
return
def _draw(self, gc):
"Draw the contents of the control"
with gc:
if self.style[0] == 'v':
self._draw_vertical(gc)
else:
self._draw_horizontal(gc)
return
def _draw_vertical(self, gc):
"Draw a vertical scrollbar"
low, high, page_size, line_size = self.range
position = self.position
x, y, dx, dy = self.bounds
adown = sb_image[ 'adown' + self._line_down_suffix ]
adown_dy = adown.height()
aup = sb_image[ 'aup' + self._line_up_suffix ]
aup_dy = aup.height()
vtrack = sb_image[ 'vtrack' ]
t_dy = dy - aup_dy - adown_dy
t_y = s_y = y + adown_dy
u_y = y + dy - aup_dy
gc.stretch_draw(vtrack, x, t_y, dx, t_dy)
gc.draw_image(adown,(x, y, dx, adown_dy))
gc.draw_image(aup, (x, u_y, dx, aup_dy))
if page_size > 0.0:
s_dy = max(vs_height, round((page_size * t_dy) / (high - low)))
self._range = range_dy = t_dy - s_dy
range = high - low - page_size
if range > 0.0:
s_y = round(s_y + (((position - low) * range_dy) / range))
suffix = self._slider_suffix
vbottom = sb_image[ 'vbottom' + suffix ]
vbottom_dy = vbottom.height()
vtop = sb_image[ 'vtop' + suffix ]
vtop_dy = vtop.height()
vmid = sb_image[ 'vmid' + suffix ]
vmid_dy = vmid.height()
gc.stretch_draw(sb_image[ 'vpad' + suffix ],
x, s_y + vbottom_dy,
dx, s_dy - vbottom_dy - vtop_dy)
gc.draw_image(vbottom,(x, s_y, dx, vbottom_dy))
gc.draw_image(vtop,(x, s_y + s_dy - vtop_dy, dx, vtop_dy))
gc.draw_image(vmid,(x, round(s_y + vbottom_dy +
(s_dy - vbottom_dy - vtop_dy - vmid_dy) / 2.0),
dx, vmid_dy))
self._info =(t_y, s_y, s_y + s_dy, u_y)
return
def _draw_horizontal(self, gc):
"Draw a horizontal scroll bar"
low, high, page_size, line_size = self.range
position = self.position
x, y, dx, dy = self.bounds
aleft = sb_image[ 'aleft' + self._line_up_suffix ]
aleft_dx = aleft.width()
aright = sb_image[ 'aright' + self._line_down_suffix ]
aright_dx = aright.width()
htrack = sb_image[ 'htrack' ]
t_dx = dx - aleft_dx - aright_dx
t_x = s_x = x + aleft_dx
r_x = x + dx - aright_dx
gc.stretch_draw(htrack, t_x, y, t_dx, dy)
gc.draw_image(aleft, (x, y, aleft_dx, dy))
gc.draw_image(aright,(r_x, y, aright_dx, dy))
if page_size > 0.0:
s_dx = max(hs_width, round((page_size * t_dx) / (high - low)))
self._range = range_dx = t_dx - s_dx
range = high - low - page_size
if range > 0.0:
s_x = round(s_x + (((position - low) * range_dx) / range))
suffix = self._slider_suffix
hleft = sb_image[ 'hleft' + suffix ]
hleft_dx = hleft.width()
hright = sb_image[ 'hright' + suffix ]
hright_dx = hright.width()
hmid = sb_image[ 'hmid' + suffix ]
hmid_dx = hmid.width()
gc.stretch_draw(sb_image[ 'hpad' + suffix ],
s_x + hleft_dx, y,
s_dx - hleft_dx - hright_dx, dy)
gc.draw_image(hleft, (s_x, y, hleft_dx, dy))
gc.draw_image(hright,(s_x + s_dx - hright_dx, y, hright_dx, dy))
gc.draw_image(hmid,(round(s_x + hleft_dx +
(s_dx - hleft_dx - hright_dx - hmid_dx) / 2.0),
y, hmid_dx, dy))
self._info =(t_x, s_x, s_x + s_dx, r_x)
return
def _get_zone(self, event):
"Determine which scrollbar zone the mouse pointer is over"
if not self.xy_in_bounds(event) or (self._info is None):
return NO_SCROLL
cbl, csl, csh, ctr = self._info
c = [ event.x, event.y ][ self.style[0] == 'v' ]
if c < cbl:
return LINE_DOWN
if c >= ctr:
return LINE_UP
if c < csl:
return PAGE_DOWN
if c >= csh:
return PAGE_UP
return SLIDER
def _scroll(self):
"Perform an incremental scroll (line up/down, page up/down)"
incr = self._scroll_incr
if incr != 0.0:
low, high, page_size, line_size = self.range
position = max(min(self.position + incr, high - page_size), low)
if position == self.position:
return
self.position = position
setattr(self, self._event_name, True)
return
def _set_zone_suffix(self, zone, suffix):
"Set a particular zone's image suffix"
if zone != NO_SCROLL:
suffix_name = zone_suffixes[ zone ]
if suffix_name != '':
setattr(self, suffix_name, suffix)
self.redraw()
return
#---------------------------------------------------------------------------
# Handle mouse events:
#---------------------------------------------------------------------------
def _left_down_changed(self, event):
event.handled = True
if self.range[2] == 0.0:
return
zone = self._get_zone(event)
if zone != NO_SCROLL:
self.window.mouse_owner = self
self._scrolling = zone
self._set_zone_suffix(zone, '_down')
if zone == SLIDER:
self._xy =(event.x, event.y)[ self.style[0] == 'v' ]
self._position = self.position
else:
self._event_name, sign, index = scroll_info[ zone ]
line_size = self.range[3]
incr = 0.0
if line_size != 0.0:
incr = sign * self.range[ index ]
if index == 2:
incr -= sign * line_size
self._scroll_incr = incr
self._scroll()
self._in_zone = True
self.timer_interval = 0.5
return
def _left_dclick_changed(self, event):
self._left_down_changed(event)
return
def _left_up_changed(self, event):
event.handled = True
scrolling = self._scrolling
if scrolling != NO_SCROLL:
zone = self._get_zone(event)
self._set_zone_suffix(scrolling, '')
self._set_zone_suffix(zone, '_over')
if scrolling != SLIDER:
self.timer_interval = None
self._scrolling = NO_SCROLL
self._zone = zone
if zone == NO_SCROLL:
self.window.mouse_owner = None
self.scroll_done = True
return
def _mouse_move_changed(self, event):
event.handled = True
self.pointer = 'arrow'
zone = self._get_zone(event)
scrolling = self._scrolling
if scrolling == SLIDER:
xy =(event.x, event.y)[ self.style[0] == 'v' ]
low, high, page_size, line_size = self.range
position = (self._position +
((xy - self._xy) * (high - low - page_size) / self._range))
self.position = max(min(position, high - page_size), low)
elif scrolling != NO_SCROLL:
in_zone = (zone == scrolling)
if in_zone != self._in_zone:
self._in_zone = in_zone
self._set_zone_suffix(scrolling, [ '', '_down' ][ in_zone ])
elif zone != self._zone:
self._set_zone_suffix(self._zone, '')
self._set_zone_suffix(zone, '_over')
self._zone = zone
self.window.mouse_owner = [ self, None ][ zone == NO_SCROLL ]
return
def _mouse_wheel_changed(self, event):
"Scrolls when the mouse scroll wheel is spun"
event.handled = True
self.position += (event.mouse_wheel * self.page_size) / 20
return
def _timer_changed(self):
"Handle timer events"
if self._scrolling != NO_SCROLL:
self.timer_interval = 0.1
if self._in_zone:
self._scroll()
return
# EOF
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