QLineEdit PyQT5 输入上的火柴盒键盘 [英] Matchbox-Keyboard on input for QLineEdit PyQT5

问题描述

我想要做的是当用户(通过触摸屏)点击可编辑的 QEditLine 时，我希望它显示火柴盒键盘以供用户输入.未单击时不显示键盘.

What I'm trying to do is when a user (via a touchscreen) clicks on an editable QEditLine I want it to show the Matchbox-Keyboard for user input. When it is not clicked do not show the keyboard.

我已经阅读了 C 文档和一些 C 示例，但我也迷失了，因为我也跳到了 Python.我看到有人提到设置焦点"，有人可以向我解释一下吗?

I've gone through the C documentation, and a few C examples, but I'm lost as too make the jump to Python. I see people mentioning setting the "focus" can someone explain this too me?

import sys
import os
from PyQt5.QtWidgets import QApplication, QFileDialog, QSlider, QComboBox, QCheckBox, QWidget, QMainWindow, QPushButton, QLabel, QGridLayout, QGroupBox, QRadioButton, QMessageBox, QLineEdit
from PyQt5.QtGui import QIcon, QPixmap
from PyQt5.QtCore import pyqtSlot, Qt


class App(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = 'GUI TESTS'
        self.left = 0
        self.top = 0
        self.width = 800
        self.height = 400
        self.statusBarMessage = "GUI TEST"
        self.currentSprite = 'TEST.png'
        self.btn1Active = False
        self.btn2Active = False
        self.btn3Active = False
        self.btn4Active = False
        self.btn5Active = False
        self.btn6Active = False
        self.btn7Active = False
        self.btn8Active = False
        self.saveLocationDir = ""
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        self.statusBar().showMessage(self.statusBarMessage)

        self.userNameLabel = QLabel(self)
        self.userNameLabel.move(0,125)
        self.userNameLabel.setText("What is your name?")
        self.userNameLabel.resize(120,20)

        self.nameInput = QLineEdit(self)
        self.nameInput.move(0,145)
        self.nameInput.resize(200,32)
        self.nameInput.setEchoMode(0)

    @pyqtSlot()
    def showKeyboard(self):
        command = "matchbox-keyboard"
        os.system(command)

推荐答案

不建议通过分配函数 self.nameInput.mousePressEvent = self.showKeyboard 来覆盖 events 方法，因为任务QLineEdit 的 mousePressEvent 丢失，可能导致意外事件.

It is not recommended to override the events method by assigning a function self.nameInput.mousePressEvent = self.showKeyboard since the tasks of the mousePressEvent of the QLineEdit are lost and could cause unexpected events.

此外，mousePressEvent 不是合适的事件，因为您可以多次按下 QLineEdit 并且它会被回调到键盘.

Also, mousePressEvent is not the appropriate event since you can press the QLineEdit many times and it would be called back to the keyboard.

更好的选择是在 focusInEvent 中启动它并在 focusOutEvent 中删除它:

A better option is to launch it in focusInEvent and delete it in focusOutEvent:

import sys
import subprocess
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

class MatchBoxLineEdit(QLineEdit):
    def focusInEvent(self, e):
        try:
            subprocess.Popen(["matchbox-keyboard"])
        except FileNotFoundError:
            pass

    def focusOutEvent(self,e):
        subprocess.Popen(["killall","matchbox-keyboard"])

class App(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('GUI TESTS')

        widget = QWidget()
        self.setCentralWidget(widget)
        lay = QVBoxLayout(widget)

        self.userNameLabel = QLabel("What is your name?")
        self.nameInput = MatchBoxLineEdit()

        lay.addWidget(self.userNameLabel)
        lay.addWidget(self.nameInput)

        self.setGeometry(
            QStyle.alignedRect(
                Qt.LeftToRight,
                Qt.AlignCenter,self.sizeHint(), 
                qApp.desktop().availableGeometry()
                )
            )


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = App()
    w.show()
    sys.exit(app.exec_())

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