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'''Unit test for QBackingStore, QRasterWindow and QStaticText'''

import unittest

from helper import UsesQApplication
from PySide2.QtCore import QEvent, QPoint, QRect, QSize, QTimer, Qt
from PySide2.QtGui import QColor, QBackingStore, QPaintDevice, QPainter, QWindow, QPaintDeviceWindow, QRasterWindow, QRegion, QStaticText

# QWindow rendering via QBackingStore
class TestBackingStoreWindow(QWindow):
    def __init__(self):
        super(TestBackingStoreWindow, self).__init__()
        self.backingStore = QBackingStore(self)
        self.text = QStaticText("BackingStoreWindow")

    def event(self, event):
        if event.type() == QEvent.Resize:
            self.backingStore.resize(self.size())
            self.render()
        elif event.type() == QEvent.UpdateRequest or event.type() == QEvent.Expose:
            self.backingStore.flush(QRegion(QRect(QPoint(0, 0), self.size())))

        return QWindow.event(self, event)

    def render(self):
        clientRect = QRect(QPoint(0, 0), self.size())
        painter = QPainter(self.backingStore.paintDevice())
        painter.fillRect(clientRect, QColor(Qt.green))
        painter.drawStaticText(QPoint(10, 10), self.text)

# Window using convenience class QRasterWindow
class TestRasterWindow(QRasterWindow):
    def __init__(self):
        super(TestRasterWindow, self).__init__()
        self.text = QStaticText("QRasterWindow")

    def paintEvent(self, event):
        clientRect = QRect(QPoint(0, 0), self.size())
        painter = QPainter(self)
        painter.fillRect(clientRect, QColor(Qt.red))
        painter.drawStaticText(QPoint(10, 10), self.text)

class QRasterWindowTest(UsesQApplication):
    def test(self):
        rasterWindow = TestRasterWindow()
        rasterWindow.setFramePosition(QPoint(100, 100))
        rasterWindow.resize(QSize(400, 400))
        rasterWindow.show()
        backingStoreWindow = TestBackingStoreWindow()
        backingStoreWindow.setFramePosition(QPoint(600, 100))
        backingStoreWindow.resize(QSize(400, 400))
        backingStoreWindow.show()

        QTimer.singleShot(100, self.app.quit)
        self.app.exec_()

if __name__ == '__main__':
    unittest.main()
