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
|
""" Defines the TraitsTool and Fifo classes, and get_nested_components function.
"""
# Enthought library imports
from enable.base_tool import BaseTool
from enable.container import Container
class Fifo:
""" Slightly-modified version of the Fifo class from the Python cookbook:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/68436
"""
def __init__(self):
self.nextin = 0
self.nextout = 0
self.data = {}
def append(self, value):
self.data[self.nextin] = value
self.nextin += 1
def extend(self, values):
if len(values) > 0:
for i,val in enumerate(values):
self.data[i+self.nextin] = val
self.nextin += i+1
def isempty(self):
return self.nextout >= self.nextin
def pop(self):
value = self.data[self.nextout]
del self.data[self.nextout]
self.nextout += 1
return value
def get_nested_components(container):
""" Returns a list of fundamental plotting components from a container
with nested containers.
Performs a breadth-first search of the containment hierarchy. Each element
in the returned list is a tuple (component, (x,y)) where (x,y) is the
coordinate frame offset of the component from the top-level container.
"""
components = []
worklist = Fifo()
worklist.append((container, (0,0)))
while 1:
item, offset = worklist.pop()
if isinstance(item, Container):
new_offset = (offset[0]+item.x, offset[1]+item.y)
for c in item.components:
worklist.append((c, new_offset))
if worklist.isempty():
break
return components
class TraitsTool(BaseTool):
""" Tool to edit the traits of whatever Enable component happens
to be clicked. Handles containers and canvases so that they
get edited only if their background regions are clicked.
"""
# This tool does not have a visual representation (overrides BaseTool).
draw_mode = "none"
# This tool is not visible (overrides BaseTool).
visible = False
def normal_left_dclick(self, event):
""" Handles the left mouse button being double-clicked when the tool
is in the 'normal' state.
If the event occurred on this tool's component (or any contained
component of that component), the method opens a Traits UI view on the
component that was double-clicked, setting the tool as the active tool
for the duration of the view.
"""
x = event.x
y = event.y
# First determine what component or components we are going to hittest
# on. If our component is a container, then we add its non-container
# components to the list of candidates.
candidates = []
component = self.component
if isinstance(component, Container):
candidates = get_nested_components(self.component)
else:
# We don't support clicking on unrecognized components
return
# Hittest against all the candidate and take the first one
item = None
for candidate, offset in candidates:
if candidate.is_in(x-offset[0], y-offset[1]):
item = candidate
break
if item:
self.component.active_tool = self
item.edit_traits(kind="livemodal")
event.handled = True
self.component.active_tool = None
item.request_redraw()
return
# EOF
|
