/usr/lib/python2.7/dist-packages/enable/scrollbar.py is in python-enable 4.1.0-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 | """
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
|