feat(scan_control): add select all and clear buttons to scan filter dialog

bec_widgets/widgets/control/scan_control/scan_selection_dialog.py

@@ -10,6 +10,7 @@ from qtpy.QtWidgets import (
     QHBoxLayout,
     QListWidget,
     QListWidgetItem,
+    QPushButton,
     QSizePolicy,
     QToolButton,
     QVBoxLayout,
@@ -76,6 +77,16 @@ class ScanSelectionDialog(QDialog):
             item.setSizeHint(row.sizeHint())
             self.scan_list.setItemWidget(item, row)
 
+        controls = QHBoxLayout()
+        controls.setContentsMargins(4, 4, 4, 0)
+        self.select_all_button = QPushButton("Select all", self)
+        self.clear_button = QPushButton("Clear", self)
+        self.select_all_button.clicked.connect(lambda: self.set_all_checked(True))
+        self.clear_button.clicked.connect(lambda: self.set_all_checked(False))
+        controls.addWidget(self.select_all_button)
+        controls.addWidget(self.clear_button)
+        controls.addStretch(1)
+
         buttons = QDialogButtonBox(
             QDialogButtonBox.StandardButton.Ok | QDialogButtonBox.StandardButton.Cancel, parent=self
         )
@@ -86,10 +97,16 @@ class ScanSelectionDialog(QDialog):
         layout = QVBoxLayout(self)
         layout.setContentsMargins(0, 0, 0, 0)
         layout.setSpacing(4)
+        layout.addLayout(controls)
         layout.addWidget(self.scan_list)
         layout.addWidget(buttons)
         self.resize(360, 420)
 
+    def set_all_checked(self, checked: bool) -> None:
+        """Check or uncheck every scan in the list."""
+        for checkbox in self._scan_checkboxes.values():
+            checkbox.setChecked(checked)
+
     def checkbox_for_scan(self, scan_name: str) -> QCheckBox:
         """Return the checkbox belonging to ``scan_name``."""
         return self._scan_checkboxes[scan_name]

tests/unit_tests/test_scan_control.py

@@ -468,6 +468,36 @@ def test_scan_selector_settings_dialog_is_released_after_use(scan_control, monke
     delete_later.assert_called_once()
 
 
+def test_scan_selector_dialog_select_all_and_clear_buttons(qtbot):
+    dialog = ScanSelectionDialog(
+        scan_names=["line_scan", "grid_scan"], selected_scans=["line_scan"]
+    )
+    qtbot.addWidget(dialog)
+    dialog.show()
+    qtbot.waitExposed(dialog)
+
+    qtbot.mouseClick(dialog.select_all_button, Qt.MouseButton.LeftButton)
+    assert dialog.selected_scans() == ["line_scan", "grid_scan"]
+
+    qtbot.mouseClick(dialog.clear_button, Qt.MouseButton.LeftButton)
+    assert dialog.selected_scans() == []
+
+
+def test_scan_selector_dialog_select_all_clears_the_filter(scan_control, monkeypatch, qtbot):
+    scan_control.allowed_scans = ["line_scan"]
+
+    def select_all(dialog):
+        dialog.set_all_checked(True)
+        return QDialog.DialogCode.Accepted
+
+    monkeypatch.setattr(ScanSelectionDialog, "exec", select_all)
+
+    qtbot.mouseClick(scan_control.scan_selector_settings_button, Qt.MouseButton.LeftButton)
+
+    assert scan_control.allowed_scans is None
+    assert scan_control.comboBox_scan_selection.count() == 2
+
+
 def test_scan_selector_dialog_whole_row_click_toggles_checkbox(qtbot):
     dialog = ScanSelectionDialog(
         scan_names=["line_scan", "grid_scan"], selected_scans=["line_scan"]