/usr/lib/python2.7/dist-packages/enable/drag_resize.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 the classes used to support the Enable package 'drag_resize'
# functionality.
#
# Written by: David C. Morrill
#
# Date: 02/04/2004
#
# (c) Copyright 2004 by Enthought, Inc.
#
# Classes defined: DragResizeHandler
#
#-------------------------------------------------------------------------------
from base import bounds_to_coordinates, TOP, BOTTOM, LEFT, RIGHT
from interactor import Interactor
from traits.api import Any
#-------------------------------------------------------------------------------
# 'DragResizeHandler' class:
#-------------------------------------------------------------------------------
class DragResizeHandler ( Interactor ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
# User-supplied drag event validation function:
drag_validate = Any
#---------------------------------------------------------------------------
# Initialize the object:
#---------------------------------------------------------------------------
def init( self, component, bounds_rect, anchor, unconstrain,
drag_event, start_event ):
self.component = component
self.bounds_rect = bounds_rect
self.anchor = anchor
self.unconstrain = unconstrain
self.drag_event = drag_event
self.start_event = start_event
self.drag_x = self.start_x = start_event.x
self.drag_y = self.start_y = start_event.y
# Get the coordinates of the anchor point:
xl, yb, xr, yt = bounds_to_coordinates( component.bounds )
if (anchor & LEFT) != 0:
self.anchor_x = xl
self.float_x = xr
else:
self.anchor_x = xr
self.float_x = xl
if (anchor & BOTTOM) != 0:
self.anchor_y = yb
self.float_y = yt
else:
self.anchor_y = yt
self.float_y = yb
# Set up the drag termination handler:
self.on_trait_change( self.drag_done, drag_event )
#---------------------------------------------------------------------------
# Handle the mouse moving while resizing:
#---------------------------------------------------------------------------
def _mouse_move_changed ( self, event ):
# Get the current drag location:
x = event.x
y = event.y
# If the mouse did not actually move, then ignore the event:
if (x == self.drag_x) and (y == self.drag_y):
return
# Save the new position:
self.drag_x = x
self.drag_y = y
# Calculate the new 'floating' point:
unconstrain = self.unconstrain
ax, ay = self.anchor_x, self.anchor_y
nx, ny = self.float_x, self.float_y
if (unconstrain & (LEFT | RIGHT)) != 0:
nx = self.float_x + x - self.start_x
if nx > ax:
if (unconstrain & RIGHT) == 0:
nx = ax
elif nx < ax:
if (unconstrain & LEFT) == 0:
nx = ax
if (unconstrain & (TOP | BOTTOM)) != 0:
ny = self.float_y + y - self.start_y
if ny > ay:
if (unconstrain & TOP) == 0:
ny = ay
elif ny < ay:
if (unconstrain & BOTTOM) == 0:
ny = ay
# Make sure the new point is inside the drag bounds (if required):
if self.bounds_rect is not None:
bxl, byb, bxr, byt = self.bounds_rect
nx = max( min( nx, bxr ), bxl )
ny = max( min( ny, byt ), byb )
# Calculate the new size of the component and make sure that it meets
# the min and max size requirements for the component:
component = self.component
mindx, maxdx = component.min_width, component.max_width
mindy, maxdy = component.min_height, component.max_height
ndx, ndy = abs( nx - ax ) + 1, abs( ny - ay ) + 1
if ndx > maxdx:
if nx > ax:
nx = ax + maxdx
else:
nx = ax - maxdx
elif ndx < mindx:
if nx < ax:
nx = ax - mindx
elif (nx > ax) or ((unconstrain & RIGHT) != 0):
nx = ax + mindx
else:
nx = ax - mindx
if ndy > maxdy:
if ny > ay:
ny = ay + maxdy
else:
ny = ay - maxdy
elif ndy < mindy:
if ny < ay:
ny = ay - mindy
elif (ny > ay) or ((unconstrain & TOP) != 0):
ny = ay + mindy
else:
ny = ay - mindy
# Update the bounds of the component:
bounds = ( min( nx, ax ), min( ny, ay ),
abs( nx - ax ) + 1, abs( ny - ay ) + 1 )
if self.drag_validate is not None:
bounds = self.drag_validate( event, bounds )
if bounds != component.bounds:
component.bounds = bounds
# Tell the 'paint' routine we are doing a drag resize operation:
event.window.drag_resize_update()
#---------------------------------------------------------------------------
# Handle the user releasing the original drag button:
#---------------------------------------------------------------------------
def drag_done ( self, event ):
# 'Unhook' the drag done notification handler:
self.on_trait_change( self.drag_done, self.drag_event, remove = True )
# Inform the component that the resize operation is complete:
self.component.resized = True
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