Add NoBorderScrollArea and tests

eqt/ui/NoBorderScrollArea.py

@@ -0,0 +1,33 @@
+from PySide2.QtWidgets import QPushButton, QScrollArea, QWidget
+import qdarkstyle, re
+
+class NoBorderScrollArea(QScrollArea):
+    """Note: move this class to eqt."""
+
+    def __init__(self, widget, parent=None):
+        """Creates an instance of a QScrollArea and sets its border to none. 
+        Sets its widget to resizable."""
+        super().__init__(parent)
+        self.setStyleSheet("QScrollArea { border: none; }")
+        self.setWidgetResizable(True)
+        self.setWidget(widget)
+        self.apply_qdarkstyle_to_buttons(widget)
+
+    def apply_qdarkstyle_to_buttons(self, widget):
+        """Applies the qdarkstyle to all the buttons in the widget explicitly. 
+        This ensures that the style is consistent with the rest of the app."""
+        if isinstance(widget, QPushButton):
+
+            button_style = self._extract_qdarkstyle_button_style()
+            widget.setStyleSheet(button_style)
+        for child in widget.findChildren(QWidget):
+            self.apply_qdarkstyle_to_buttons(child)
+
+    def _extract_qdarkstyle_button_style(self):
+        """Returns the QPushButton styles from qdarkstyle, including the different button styles."""
+        style = qdarkstyle.load_stylesheet(qt_api='pyside2')
+        pattern = re.compile(r"(QPushButton\s*{[^}]*}|QPushButton\s*:[^}]*{[^}]*})", re.DOTALL)
+        matches = pattern.findall(style)
+        if matches:
+            return ''.join(matches)
+        return ""

test/test_NoBorderScrollArea.py

@@ -0,0 +1,26 @@
+import unittest
+from eqt.ui.NoBorderScrollArea import NoBorderScrollArea
+from PySide2.QtWidgets import QApplication, QHBoxLayout, QPushButton, QWidget
+
+class TestNoBorderScrollArea(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        '''If not present already, creates a QApplication.'''
+        if not QApplication.instance():
+            app = QApplication([])
+        else:
+            app = QApplication.instance()
+
+    def setUp(self):
+        '''Initialises a NoBorderScrollArea widget and adds it to a layout.'''
+        self.main_widget = QWidget()
+        self.layout = QHBoxLayout(self.main_widget)
+        self.scroll_area_widget = NoBorderScrollArea(QPushButton())
+        self.layout.addWidget(self.scroll_area_widget)
+
+    def test_scroll_area_creation(self):
+        '''
+        Tests the init method of the NoBorderScrollArea class.
+        '''
+        self.assertIsNotNone(self.scroll_area_widget, "NoBorderScrollArea widget should be created")