how do you bold and un-bold a selected text? [pyqt or pyside]

adfinem_rising

this code bolds the whole line were the cursor is placed.
how would it be possible to only bold a text that i selected?

import sys
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.uic import loadUiType
import sip



class Widget(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(500, 500, 700, 700)
        self.te = QTextEdit(self)
        self.te.setText('hello, this is big problem. why no bold one word?')

        self.button = QPushButton("bold the text", self)
        self.button.move(150, 200)
        self.button.clicked.connect(self.bold_text)

        self.document = self.te.document()
        self.cursor = QTextCursor(self.document)

    def bold_text(self):
        # bold the text
        
        self.cursor.movePosition(QTextCursor.Start)
        self.cursor.movePosition(QTextCursor.EndOfLine, QTextCursor.KeepAnchor)
        self.format = QTextCharFormat()
        self.format.setFontWeight(QFont.Bold)
        self.cursor.mergeCharFormat(self.format)

if __name__ == "__main__":

    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

adfinem_rising

greetings friends, i have not found the exact solution that i wanted, but i found a solution that is even greater than what my peasant brain can comprehend..

i have found an example in the qt for python documentation and dumbed it down. i even threw in the italic and underline in case someone needs it

enjoy <3

import sys
from PyQt5 import QtWidgets as qtw
from PyQt5 import QtCore as qtc
from PyQt5 import QtGui as qtg 

#import resources # create a qrc file for your images my guy ;) alan d moore taught me that

# learned from a programming pyqt god, 
# none other than this guy: https://www.youtube.com/watch?v=QdOoZ7edqXc&list=PLXlKT56RD3kBu2Wk6ajCTyBMkPIGx7O37&index=4


class MainWindow(qtw.QMainWindow):
    def __init__(self):
        super().__init__()
        # ===========================
        # code starts here
        # ===========================
        # text edit
        self.textedit = qtw.QTextEdit()
        self.setCentralWidget(self.textedit)
        
        # call toolbar method
        self.create_toolbar()

        # ===========================
        # code ends here
        # ===========================
        self.show()

    def create_toolbar(self):
        # font weight toolbar
        font_weight_toolbar = self.addToolBar("Font Weight") #QToolBar
        font_weight_toolbar.setIconSize(qtc.QSize(18,18))

        # qt documentation for python: https://doc.qt.io/qtforpython/
        # example code from documentation:  https://doc.qt.io/qtforpython/examples/example_widgets_richtext_textedit.html
        
        # complicated code for bold
        self._action_text_bold = font_weight_toolbar.addAction(qtg.QIcon(':/images/bold.png'), "&Bold", self.bold_text)
        self._action_text_bold.setShortcut(qtc.Qt.CTRL | qtc.Qt.Key_B)
        bold_font = qtg.QFont()
        bold_font.setBold(True)
        self._action_text_bold.setFont(bold_font)
        self._action_text_bold.setCheckable(True)
        self._action_text_bold.setStatusTip("Toggle whether the font weight is bold or not")

        # complicated code for italic
        self._action_text_italic = font_weight_toolbar.addAction(qtg.QIcon(':/images/italic.png'), "&Italic", self.italic_text)
        self._action_text_italic.setShortcut(qtc.Qt.CTRL | qtc.Qt.Key_I)
        italic_font = qtg.QFont()
        italic_font.setItalic(True)
        self._action_text_italic.setFont(italic_font)
        self._action_text_italic.setCheckable(True)
        self._action_text_italic.setStatusTip("Toggle whether the font is italic or not")

        # complicated code for underline
        self._action_text_underline = font_weight_toolbar.addAction(qtg.QIcon(':/images/underline.png'), "&Underline", self.underlined_text)
        self._action_text_underline.setShortcut(qtc.Qt.CTRL | qtc.Qt.Key_U)
        underlined_font = qtg.QFont()
        underlined_font.setUnderline(True)
        self._action_text_underline.setFont(underlined_font)
        self._action_text_underline.setCheckable(True)
        self._action_text_underline.setStatusTip("Toggle whether the font is underlined or not")

    def bold_text(self): 
        fmt = qtg.QTextCharFormat()
        weight = qtg.QFont.DemiBold if self._action_text_bold.isChecked() else qtg.QFont.Normal
        fmt.setFontWeight(weight)
        self.merge_format_on_word_or_selection(fmt)

    def italic_text(self):
        fmt = qtg.QTextCharFormat()
        fmt.setFontItalic(self._action_text_italic.isChecked())
        self.merge_format_on_word_or_selection(fmt)

    def underlined_text(self):
        fmt = qtg.QTextCharFormat()
        fmt.setFontUnderline(self._action_text_underline.isChecked())
        self.merge_format_on_word_or_selection(fmt)

    def merge_format_on_word_or_selection(self, format):
        cursor = self.textedit.textCursor()
        if not cursor.hasSelection(): 
            cursor.select(qtg.QTextCursor.WordUnderCursor)
        cursor.mergeCharFormat(format)
        self.textedit.mergeCurrentCharFormat(format)


if __name__ == "__main__":
    app = qtw.QApplication.instance()
    if app is None:            
        # in every pyqt application it is required to create the object of QApplication
        app = qtw.QApplication(sys.argv)
    else:
        print('QApplication instance already exists: %s' % str(app))


    # initialize and show Qwidget object
    main = MainWindow()
    # main window properties
    main.setWindowTitle("Text Editor")
    main.resize(650,500)
    main.setMinimumSize(550,450)
    main.setWindowIcon(qtg.QIcon(":/images/notepad.png"))
    
    try:
        sys.exit(app.exec_())
    except SystemExit:
        print("Closing Window...")

SGaist

Hi,

Can you link the example you used ? It might also help others coming in your topic.

adfinem_rising

with pleasure my guy! here it is:

example code from documentation (bold, italic, underline):
https://doc.qt.io/qtforpython/examples/example_widgets_richtext_textedit.html

qt documentation for python:
https://doc.qt.io/qtforpython/

SGaist

Thanks !