tcompletion_text_edit.py - electrum - Electrum Bitcoin wallet
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tcompletion_text_edit.py (4417B)
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1 #!/usr/bin/env python
2 #
3 # Electrum - lightweight Bitcoin client
4 # Copyright (C) 2018 The Electrum developers
5 #
6 # Permission is hereby granted, free of charge, to any person
7 # obtaining a copy of this software and associated documentation files
8 # (the "Software"), to deal in the Software without restriction,
9 # including without limitation the rights to use, copy, modify, merge,
10 # publish, distribute, sublicense, and/or sell copies of the Software,
11 # and to permit persons to whom the Software is furnished to do so,
12 # subject to the following conditions:
13 #
14 # The above copyright notice and this permission notice shall be
15 # included in all copies or substantial portions of the Software.
16 #
17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
21 # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
22 # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 # SOFTWARE.
25
26 from PyQt5.QtGui import QTextCursor
27 from PyQt5.QtCore import Qt
28 from PyQt5.QtWidgets import QCompleter, QPlainTextEdit, QApplication
29
30 from .util import ButtonsTextEdit
31
32
33 class CompletionTextEdit(ButtonsTextEdit):
34
35 def __init__(self):
36 ButtonsTextEdit.__init__(self)
37 self.completer = None
38 self.moveCursor(QTextCursor.End)
39 self.disable_suggestions()
40
41 def set_completer(self, completer):
42 self.completer = completer
43 self.initialize_completer()
44
45 def initialize_completer(self):
46 self.completer.setWidget(self)
47 self.completer.setCompletionMode(QCompleter.PopupCompletion)
48 self.completer.activated.connect(self.insert_completion)
49 self.enable_suggestions()
50
51 def insert_completion(self, completion):
52 if self.completer.widget() != self:
53 return
54 text_cursor = self.textCursor()
55 extra = len(completion) - len(self.completer.completionPrefix())
56 text_cursor.movePosition(QTextCursor.Left)
57 text_cursor.movePosition(QTextCursor.EndOfWord)
58 if extra == 0:
59 text_cursor.insertText(" ")
60 else:
61 text_cursor.insertText(completion[-extra:] + " ")
62 self.setTextCursor(text_cursor)
63
64 def text_under_cursor(self):
65 tc = self.textCursor()
66 tc.select(QTextCursor.WordUnderCursor)
67 return tc.selectedText()
68
69 def enable_suggestions(self):
70 self.suggestions_enabled = True
71
72 def disable_suggestions(self):
73 self.suggestions_enabled = False
74
75 def keyPressEvent(self, e):
76 if self.isReadOnly():
77 return
78
79 if self.is_special_key(e):
80 e.ignore()
81 return
82
83 QPlainTextEdit.keyPressEvent(self, e)
84
85 ctrlOrShift = e.modifiers() and (Qt.ControlModifier or Qt.ShiftModifier)
86 if self.completer is None or (ctrlOrShift and not e.text()):
87 return
88
89 if not self.suggestions_enabled:
90 return
91
92 eow = "~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="
93 hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift
94 completionPrefix = self.text_under_cursor()
95
96 if hasModifier or not e.text() or len(completionPrefix) < 1 or eow.find(e.text()[-1]) >= 0:
97 self.completer.popup().hide()
98 return
99
100 if completionPrefix != self.completer.completionPrefix():
101 self.completer.setCompletionPrefix(completionPrefix)
102 self.completer.popup().setCurrentIndex(self.completer.completionModel().index(0, 0))
103
104 cr = self.cursorRect()
105 cr.setWidth(self.completer.popup().sizeHintForColumn(0) + self.completer.popup().verticalScrollBar().sizeHint().width())
106 self.completer.complete(cr)
107
108 def is_special_key(self, e):
109 if self.completer and self.completer.popup().isVisible():
110 if e.key() in (Qt.Key_Enter, Qt.Key_Return):
111 return True
112 if e.key() == Qt.Key_Tab:
113 return True
114 return False
115
116 if __name__ == "__main__":
117 app = QApplication([])
118 completer = QCompleter(["alabama", "arkansas", "avocado", "breakfast", "sausage"])
119 te = CompletionTextEdit()
120 te.set_completer(completer)
121 te.show()
122 app.exec_()