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

import os
import sys
import unittest

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from init_paths import init_test_paths
init_test_paths(False)

from helper.usesqapplication 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()
