KeypressEvent

# -*- coding: utf-8 -*-
"""
Author: Virgil
Date: 2020/6/6 11:18
"""

from PySide2 import QtCore
from PySide2 import QtGui
from PySide2 import QtWidgets
from shiboken2 import wrapInstance

import maya.OpenMayaUI as omui
import maya.cmds as cmds
import maya.mel as mel

def maya_main_window():
    """
    Return the Maya main window widget as a Python object
    """
    main_window_ptr = omui.MQtUtil.mainWindow()
    return wrapInstance(long(main_window_ptr), QtWidgets.QWidget)

class CustomPlainTextEdit(QtWidgets.QPlainTextEdit):
    def __init__(self, parent=None):
        super(CustomPlainTextEdit, self).__init__(parent)

    def keyPressEvent(self, event):
        super(CustomPlainTextEdit, self).keyPressEvent(event)

        key = event.key()
        if key == QtCore.Qt.Key_0:
            print("0 key pressed.")
        elif key == QtCore.Qt.Key_A:
            print("A key pressed")
        elif key == QtCore.Qt.Key_Enter:
            print("Enter key pressed") # 小鍵盤迴車鍵
        elif key == QtCore.Qt.Key_Return:
            print("Return key pressed") # 大鍵盤迴車鍵

        ctrl = event.modifiers() == QtCore.Qt.ControlModifier  # ControlModifier/ShiftModifier/AltModifier
        print("Control Modifiers: {0}".format(ctrl))

        ctrl_alt = event.modifiers() == (QtCore.Qt.ControlModifier | QtCore.Qt.AltModifier)
        print("Ctrl+Alt Modifiers: {0}".format(ctrl_alt))

        if key == QtCore.Qt.Key_Return or key == QtCore.Qt.Key_Enter:
            if ctrl:
                print("Execute Code")
                return 
            elif ctrl_alt:
                print("Execute Line")
                return

        # print("Key Pressed: {0}".format(event.text()))

    def keyReleaseEvent(self, event):
        super(CustomPlainTextEdit, self).keyReleaseEvent(event)

        # print("Key Released: {0}".format(event.text()))

class KeypressExample(QtWidgets.QDialog):
    WINDOW_TITLE = "Keypress Example"
    
    def __init__(self, parent=maya_main_window()):
        super(KeypressExample, self).__init__(parent)

        self.setWindowTitle(self.WINDOW_TITLE)
        self.setMinimumSize(600, 400)
        self.setWindowFlags(self.windowFlags() ^ QtCore.Qt.WindowContextHelpButtonHint)

        self.create_widgets()
        self.create_layout()
        self.create_connections()

    def create_widgets(self):
        self.plain_text = CustomPlainTextEdit()

    def create_layout(self):
        main_layout = QtWidgets.QVBoxLayout(self)
        main_layout.setContentsMargins(5, 5, 5, 5)
        main_layout.addWidget(self.plain_text)

    def create_connections(self):
        pass
    
def showWindow():
    global dialog
    try:
        dialog.close()
        dialog.deleteLater()
    except:
        pass

    dialog = KeypressExample()
    dialog.show()

if __name__ == "__main__":
    try:
        dialog.close()
        dialog.deleteLater()
    except:
        pass

    dialog = KeypressExample()
    dialog.show()