summaryrefslogtreecommitdiffstats
path: root/Lib/idlelib/CallTipWindow.py
blob: afd4439a7df26b1e4e8d17189b97ad1ed3bf2054 (plain)
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
"""A CallTip window class for Tkinter/IDLE.

After ToolTip.py, which uses ideas gleaned from PySol
Used by the CallTips IDLE extension.

"""
from Tkinter import *

HIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-hide>>"
HIDE_SEQUENCES = ("<Key-Escape>", "<FocusOut>")
CHECKHIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-checkhide>>"
CHECKHIDE_SEQUENCES = ("<KeyRelease>", "<ButtonRelease>")
CHECKHIDE_TIME = 100 # miliseconds

MARK_RIGHT = "calltipwindowregion_right"

class CallTip:

    def __init__(self, widget):
        self.widget = widget
        self.tipwindow = self.label = None
        self.parenline = self.parencol = None
        self.lastline = None
        self.hideid = self.checkhideid = None

    def position_window(self):
        """Check if needs to reposition the window, and if so - do it."""
        curline = int(self.widget.index("insert").split('.')[0])
        if curline == self.lastline:
            return
        self.lastline = curline
        self.widget.see("insert")
        if curline == self.parenline:
            box = self.widget.bbox("%d.%d" % (self.parenline,
                                              self.parencol))
        else:
            box = self.widget.bbox("%d.0" % curline)
        if not box:
            box = list(self.widget.bbox("insert"))
            # align to left of window
            box[0] = 0
            box[2] = 0
        x = box[0] + self.widget.winfo_rootx() + 2
        y = box[1] + box[3] + self.widget.winfo_rooty()
        self.tipwindow.wm_geometry("+%d+%d" % (x, y))

    def showtip(self, text, parenleft, parenright):
        """Show the calltip, bind events which will close it and reposition it.
        """
        # truncate overly long calltip
        if len(text) >= 79:
            text = text[:75] + ' ...'
        self.text = text
        if self.tipwindow or not self.text:
            return

        self.widget.mark_set(MARK_RIGHT, parenright)
        self.parenline, self.parencol = map(
            int, self.widget.index(parenleft).split("."))

        self.tipwindow = tw = Toplevel(self.widget)
        self.position_window()
        # remove border on calltip window
        tw.wm_overrideredirect(1)
        try:
            # This command is only needed and available on Tk >= 8.4.0 for OSX
            # Without it, call tips intrude on the typing process by grabbing
            # the focus.
            tw.tk.call("::tk::unsupported::MacWindowStyle", "style", tw._w,
                       "help", "noActivates")
        except TclError:
            pass
        self.label = Label(tw, text=self.text, justify=LEFT,
                           background="#ffffe0", relief=SOLID, borderwidth=1,
                           font = self.widget['font'])
        self.label.pack()

        self.checkhideid = self.widget.bind(CHECKHIDE_VIRTUAL_EVENT_NAME,
                                            self.checkhide_event)
        for seq in CHECKHIDE_SEQUENCES:
            self.widget.event_add(CHECKHIDE_VIRTUAL_EVENT_NAME, seq)
        self.widget.after(CHECKHIDE_TIME, self.checkhide_event)
        self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME,
                                       self.hide_event)
        for seq in HIDE_SEQUENCES:
            self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq)

    def checkhide_event(self, event=None):
        if not self.tipwindow:
            # If the event was triggered by the same event that unbinded
            # this function, the function will be called nevertheless,
            # so do nothing in this case.
            return
        curline, curcol = map(int, self.widget.index("insert").split('.'))
        if curline < self.parenline or \
           (curline == self.parenline and curcol <= self.parencol) or \
           self.widget.compare("insert", ">", MARK_RIGHT):
            self.hidetip()
        else:
            self.position_window()
            self.widget.after(CHECKHIDE_TIME, self.checkhide_event)

    def hide_event(self, event):
        if not self.tipwindow:
            # See the explanation in checkhide_event.
            return
        self.hidetip()

    def hidetip(self):
        if not self.tipwindow:
            return

        for seq in CHECKHIDE_SEQUENCES:
            self.widget.event_delete(CHECKHIDE_VIRTUAL_EVENT_NAME, seq)
        self.widget.unbind(CHECKHIDE_VIRTUAL_EVENT_NAME, self.checkhideid)
        self.checkhideid = None
        for seq in HIDE_SEQUENCES:
            self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq)
        self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid)
        self.hideid = None

        self.label.destroy()
        self.label = None
        self.tipwindow.destroy()
        self.tipwindow = None

        self.widget.mark_unset(MARK_RIGHT)
        self.parenline = self.parencol = self.lastline = None

    def is_active(self):
        return bool(self.tipwindow)



###############################
#
# Test Code
#
class container: # Conceptually an editor_window
    def __init__(self):
        root = Tk()
        text = self.text = Text(root)
        text.pack(side=LEFT, fill=BOTH, expand=1)
        text.insert("insert", "string.split")
        root.update()
        self.calltip = CallTip(text)

        text.event_add("<<calltip-show>>", "(")
        text.event_add("<<calltip-hide>>", ")")
        text.bind("<<calltip-show>>", self.calltip_show)
        text.bind("<<calltip-hide>>", self.calltip_hide)

        text.focus_set()
        root.mainloop()

    def calltip_show(self, event):
        self.calltip.showtip("Hello world")

    def calltip_hide(self, event):
        self.calltip.hidetip()

def main():
    # Test code
    c=container()

if __name__=='__main__':
    main()