自动完成最后输入的单词

Question

我需要创建一个 GUI，让您可以键入短语并尝试自动完成键入的每个单词并在其下再次打印输入。当我使用 PyQt5 中的 QCompleter 时，当我输入一个单词时它工作正常，但是当我输入第二个单词时我无法自动完成它，因为它会尝试自动完成整个输入短语。我如何为每个输入的单词提供建议？

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QTextEdit, QLineEdit, QCompleter
from PyQt5.QtGui import QStandardItem, QStandardItemModel, QFont

class AppDemo(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(1200, 800)

        fnt = QFont('Open Sans', 12)

        mainLayout = QVBoxLayout()

        # input field
        self.input = QLineEdit()
        self.input.setFixedHeight(50)
        self.input.setFont(fnt)
        self.input.textEdited.connect(self.addEntry)
        mainLayout.addWidget(self.input)

        self.model = QStandardItemModel()
        completer = QCompleter(self.model, self)
        self.input.setCompleter(completer)

        self.console = QTextEdit()
        self.console.setFont(fnt)
        mainLayout.addWidget(self.console)

        self.setLayout(mainLayout)

    def addEntry(self):
        entryItem = self.input.text()
        self.console.clear()
        self.console.append(entryItem)

        if not self.model.findItems(entryItem):
            self.model.appendRow(QStandardItem(entryItem))


app = QApplication(sys.argv)
demo = AppDemo()
demo.show()
sys.exit(app.exec_())

Answer 1

既然要添加文本，那么将QCompleter设置为QLineEdit会使任务复杂化，这里是独立处理QCompleter的逻辑。

from functools import cached_property

from PyQt5.QtGui import QFont, QStandardItem, QStandardItemModel
from PyQt5.QtWidgets import QApplication, QCompleter, QLineEdit


class LineEdit(QLineEdit):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setFixedHeight(40)
        font = QFont("Open Sans", 12)
        self.setFont(font)
        self.completer.setWidget(self)
        self.completer.setModel(self.model)
        self.textChanged.connect(self.handle_text_changed)
        self.completer.activated.connect(self.handle_activated)

    @cached_property
    def model(self):
        return QStandardItemModel()

    @cached_property
    def completer(self):
        return QCompleter()

    def add_word(self, word):
        if not self.model.findItems(word):
            self.model.appendRow(QStandardItem(word))

    def handle_text_changed(self):
        text = self.text()[0 : self.cursorPosition()]
        if not text:
            self.completer.popup().hide()
            return
        words = text.split()
        if text.endswith(" "):
            for word in words:
                self.add_word(word)
            self.completer.popup().hide()
            return
        self.completer.setCompletionPrefix(words[-1])
        self.completer.complete()

    def handle_activated(self, text):
        prefix = self.completer.completionPrefix()
        extra = text[len(prefix) :]
        self.blockSignals(True)
        self.insert(extra)
        self.blockSignals(False)
        self.add_word(text)


def main():
    import sys

    app = QApplication(sys.argv)

    lineedit = LineEdit()
    lineedit.show()

    sys.exit(app.exec())


if __name__ == "__main__":
    main()

自动完成最后输入的单词

Autocomplete last typed word

python

user-interface

autocomplete

pyqt

pyqt5