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import sys
import os

from PyQt6.QtCore import QLibraryInfo, QProcess, QProcessEnvironment
from PyQt6.QtWidgets import QApplication, QMessageBox


app = QApplication(sys.argv)

QMessageBox.information(None, "PyQt Designer Plugins",
        "<p>This example will start Qt Designer when you click the <b>OK</b> "
        "button.</p>"
        "<p>Before doing so it sets the <tt>PYQTDESIGNERPATH</tt> environment "
        "variable to the <tt>python</tt> directory that is part of this "
        "example.  This directory contains all the example Python plugin "
        "modules.</p>"
        "<p>It also sets the <tt>PYTHONPATH</tt> environment variable to the "
        "<tt>widgets</tt> directory that is also part of this example.  This "
        "directory contains the Python modules that implement the example "
        "custom widgets.</p>"
        "<p>All of the example custom widgets should then appear in "
        "Designer's widget box in the <b>PyQt Examples</b> group.</p>")

# Tell Qt Designer where it can find the directory containing the plugins and
# Python where it can find the widgets.
base = os.path.dirname(__file__)
env = QProcessEnvironment.systemEnvironment()
env.insert('PYQTDESIGNERPATH', os.path.join(base, 'python'))
env.insert('PYTHONPATH', os.path.join(base, 'widgets'))

# Start Designer.
designer = QProcess()
designer.setProcessEnvironment(env)

designer_bin = QLibraryInfo.path(QLibraryInfo.LibraryPath.BinariesPath)

if sys.platform == 'darwin':
    designer_bin += '/Designer.app/Contents/MacOS/Designer'
else:
    designer_bin += '/designer'

designer.start(designer_bin)
designer.waitForFinished(-1)

sys.exit(designer.exitCode())
