webView - GitPress.io

Example Python program webView.py Python version 3.x or newer. To check the Python version use:

python --version

Modules

from cu2qu.defcon import font_to_quadratic
from fontTools.feaLib.error import FeatureLibError
from io import BytesIO
from PyQt5.QtGui import QFontDatabase
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebKit import QWebView

Classes

class WebEngineFontView(QWebEngineView):

Methods

def init(self, parent=None):
def closeEvent(self, event):
def _extractPSName(self, font):
def _fontChanged(self, notification):
def updateFont(self):
def updateHtml(self, psName):

Code

Example Python PyQt program :

from cu2qu.defcon import font_to_quadratic
from fontTools.feaLib.error import FeatureLibError
from io import BytesIO
from PyQt5.QtGui import QFontDatabase
try:
    # Chromium
    from PyQt5.QtWebEngineWidgets import QWebEngineView
except ImportError:
    # WebKit
    from PyQt5.QtWebKit import QWebView
    QWebEngineView = QWebView

class WebEngineFontView(QWebEngineView):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._font = CurrentFont()
        self._font.addObserver(
            self, "_fontChanged", "Font.Changed")
        self._fontId = None
        self.updateFont()

    def closeEvent(self, event):
        self._font.removeObserver(self, "Font.Changed")
        event.accept()

    # drawbot, edited
    def _extractPSName(self, font):
        psName = font["name"].getName(6, 1, 0)
        if psName is None:
            psName = font["name"].getName(6, 3, 1)
        return psName

    def _fontChanged(self, notification):
        self.updateFont()

    def updateFont(self):
        font_to_quadratic(self._font)
        try:
            otf = self._font.getRepresentation(
                "defconQt.QuadraticTTFont")
        except FeatureLibError as e:
            traceback.print_exc()
            print(e.location)
            return
        stream = BytesIO()
        otf.save(stream)
        id = QFontDatabase.addApplicationFontFromData(
            stream.getvalue())
        if id == -1:
            return
        if self._fontId is not None:
            QFontDatabase.removeApplicationFont(
                self._fontId)
        psName = self._extractPSName(otf)
        if psName is None:
            return
        self._fontId = id
        self.updateHtml(psName)

    def updateHtml(self, psName):
        html = """
<head>
    <style>
        html {
            font-family: %s;
        }
    <style>
</head>
<body>
   Grumpy wizards make toxic brew for the evil Queen and Jack. A quick movement of the enemy will jeopardize six gunboats. The job of waxing linoleum frequently peeves chintzy kids. My girl wove six dozen plaid jackets before she quit. Twelve ziggurats quickly jumped a finch box.
</body>
        """ % psName
        self.setHtml(html)

webView = WebEngineFontView()
webView.show()

Useful Links

Articles: https://python-commandments.org/
PyQt: https://pythonpyqt.com/
Tutorial: https://pythonprogramminglanguage.com/