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
|
"""A call-tip window class for Tkinter/IDLE.
After tooltip.py, which uses ideas gleaned from PySol.
Used by calltip.py.
"""
from tkinter import Label, LEFT, SOLID, TclError
from idlelib.tooltip import TooltipBase
HIDE_EVENT = "<<calltipwindow-hide>>"
HIDE_SEQUENCES = ("<Key-Escape>", "<FocusOut>")
CHECKHIDE_EVENT = "<<calltipwindow-checkhide>>"
CHECKHIDE_SEQUENCES = ("<KeyRelease>", "<ButtonRelease>")
CHECKHIDE_TIME = 100 # milliseconds
MARK_RIGHT = "calltipwindowregion_right"
class CalltipWindow(TooltipBase):
"""A call-tip widget for tkinter text widgets."""
def __init__(self, text_widget):
"""Create a call-tip; shown by showtip().
text_widget: a Text widget with code for which call-tips are desired
"""
# Note: The Text widget will be accessible as self.anchor_widget
super().__init__(text_widget)
self.label = self.text = None
self.parenline = self.parencol = self.lastline = None
self.hideid = self.checkhideid = None
self.checkhide_after_id = None
def get_position(self):
"""Choose the position of the call-tip."""
curline = int(self.anchor_widget.index("insert").split('.')[0])
if curline == self.parenline:
anchor_index = (self.parenline, self.parencol)
else:
anchor_index = (curline, 0)
box = self.anchor_widget.bbox("%d.%d" % anchor_index)
if not box:
box = list(self.anchor_widget.bbox("insert"))
# align to left of window
box[0] = 0
box[2] = 0
return box[0] + 2, box[1] + box[3]
def position_window(self):
"Reposition the window if needed."
curline = int(self.anchor_widget.index("insert").split('.')[0])
if curline == self.lastline:
return
self.lastline = curline
self.anchor_widget.see("insert")
super().position_window()
def showtip(self, text, parenleft, parenright):
"""Show the call-tip, bind events which will close it and reposition it.
text: the text to display in the call-tip
parenleft: index of the opening parenthesis in the text widget
parenright: index of the closing parenthesis in the text widget,
or the end of the line if there is no closing parenthesis
"""
# Only called in calltip.Calltip, where lines are truncated
self.text = text
if self.tipwindow or not self.text:
return
self.anchor_widget.mark_set(MARK_RIGHT, parenright)
self.parenline, self.parencol = map(
int, self.anchor_widget.index(parenleft).split("."))
super().showtip()
self._bind_events()
def showcontents(self):
"""Create the call-tip widget."""
self.label = Label(self.tipwindow, text=self.text, justify=LEFT,
background="#ffffd0", foreground="black",
relief=SOLID, borderwidth=1,
font=self.anchor_widget['font'])
self.label.pack()
def checkhide_event(self, event=None):
"""Handle CHECK_HIDE_EVENT: call hidetip or reschedule."""
if not self.tipwindow:
# If the event was triggered by the same event that unbound
# this function, the function will be called nevertheless,
# so do nothing in this case.
return None
# Hide the call-tip if the insertion cursor moves outside of the
# parenthesis.
curline, curcol = map(int, self.anchor_widget.index("insert").split('.'))
if curline < self.parenline or \
(curline == self.parenline and curcol <= self.parencol) or \
self.anchor_widget.compare("insert", ">", MARK_RIGHT):
self.hidetip()
return "break"
# Not hiding the call-tip.
self.position_window()
# Re-schedule this function to be called again in a short while.
if self.checkhide_after_id is not None:
self.anchor_widget.after_cancel(self.checkhide_after_id)
self.checkhide_after_id = \
self.anchor_widget.after(CHECKHIDE_TIME, self.checkhide_event)
return None
def hide_event(self, event):
"""Handle HIDE_EVENT by calling hidetip."""
if not self.tipwindow:
# See the explanation in checkhide_event.
return None
self.hidetip()
return "break"
def hidetip(self):
"""Hide the call-tip."""
if not self.tipwindow:
return
try:
self.label.destroy()
except TclError:
pass
self.label = None
self.parenline = self.parencol = self.lastline = None
try:
self.anchor_widget.mark_unset(MARK_RIGHT)
except TclError:
pass
try:
self._unbind_events()
except (TclError, ValueError):
# ValueError may be raised by MultiCall
pass
super().hidetip()
def _bind_events(self):
"""Bind event handlers."""
self.checkhideid = self.anchor_widget.bind(CHECKHIDE_EVENT,
self.checkhide_event)
for seq in CHECKHIDE_SEQUENCES:
self.anchor_widget.event_add(CHECKHIDE_EVENT, seq)
self.anchor_widget.after(CHECKHIDE_TIME, self.checkhide_event)
self.hideid = self.anchor_widget.bind(HIDE_EVENT,
self.hide_event)
for seq in HIDE_SEQUENCES:
self.anchor_widget.event_add(HIDE_EVENT, seq)
def _unbind_events(self):
"""Unbind event handlers."""
for seq in CHECKHIDE_SEQUENCES:
self.anchor_widget.event_delete(CHECKHIDE_EVENT, seq)
self.anchor_widget.unbind(CHECKHIDE_EVENT, self.checkhideid)
self.checkhideid = None
for seq in HIDE_SEQUENCES:
self.anchor_widget.event_delete(HIDE_EVENT, seq)
self.anchor_widget.unbind(HIDE_EVENT, self.hideid)
self.hideid = None
def _calltip_window(parent): # htest #
from tkinter import Toplevel, Text, LEFT, BOTH
top = Toplevel(parent)
top.title("Test call-tips")
x, y = map(int, parent.geometry().split('+')[1:])
top.geometry("250x100+%d+%d" % (x + 175, y + 150))
text = Text(top)
text.pack(side=LEFT, fill=BOTH, expand=1)
text.insert("insert", "string.split")
top.update()
calltip = CalltipWindow(text)
def calltip_show(event):
calltip.showtip("(s='Hello world')", "insert", "end")
def calltip_hide(event):
calltip.hidetip()
text.event_add("<<calltip-show>>", "(")
text.event_add("<<calltip-hide>>", ")")
text.bind("<<calltip-show>>", calltip_show)
text.bind("<<calltip-hide>>", calltip_hide)
text.focus_set()
if __name__ == '__main__':
from unittest import main
main('idlelib.idle_test.test_calltip_w', verbosity=2, exit=False)
from idlelib.idle_test.htest import run
run(_calltip_window)
|
