Separate out common theme elements from light and dark only leaving c…

…olor palettes in style sheets

src/sas/system/themes/__init__.py

@@ -10,10 +10,11 @@
 
 # The base dictionary mapping theme names to their location on disk.
 OPTIONS = {
-    'Default': Path(os.path.join(os.path.dirname(__file__), 'default.css')),
+    'Light': Path(os.path.join(os.path.dirname(__file__), 'default.css')),
     'Dark': Path(os.path.join(os.path.dirname(__file__), 'dark.css')),
     'Classic': Path(os.path.join(os.path.dirname(__file__), 'classic.css')),
 }
+USES_STYLE_BASE = ['Light', 'Dark']
 
 # A template string for setting the font size
 FONT = "* {{font-size: {}pt; font-family: Helvetica, Arial, Verdana, sans-serif}}\n"
@@ -25,10 +26,10 @@ def load_theme(theme: str = None) -> str:
     :return: The CSS string loaded from file
     """
     themes = find_available_themes()
-    css = ""
     if not theme or theme not in find_available_themes():
         logger.warning(f"Invalid theme name provided: {theme}")
-        theme = 'Default'
+        theme = 'Light'
+    css = "" if theme not in USES_STYLE_BASE else STYLE_BASE
     # User themes should use the classic theme as a basis and build on it from there
     if theme.startswith('User:'):
         with open(themes.get('Classic').absolute()) as fd:
@@ -60,3 +61,141 @@ def format_font_size(font_size: float) -> str:
     :param font_size: The font size, in pt units, to use.
     :return: FONT.format(font_size)"""
     return FONT.format(font_size)
+
+
+STYLE_BASE = """
+/* QWidget Properties */
+QWidget:focus {outline: none;}
+
+/* QMainWindow Properties */
+QMainWindow::separator {width: 4px; height: 4px;}
+
+/* QCheckBox and QRadioButton Properties */
+QCheckBox, QRadioButton {border-top: 2px solid transparent; border-bottom: 2px solid transparent;}
+QCheckBox::indicator:enabled, QRadioButton::indicator:enabled {height: 14px; width: 14px;}
+QCheckBox::indicator:hover, QRadioButton::indicator:hover {height: 14px; width: 14px;}
+
+/* QGroupBox Properties */
+QGroupBox {font-weight: bold; margin-top: 8px; padding: 2px 1px 1px 1px; border-radius: 4px;}
+QGroupBox::title {subcontrol-origin: margin; subcontrol-position: top left; left: 7px; margin: 0 2px 0 3px;}
+QGroupBox:flat {border-color: transparent;}
+
+/* QToolTip Properties */
+QToolTip {font-size: 80%;}
+
+/* QMenuBar Properties */
+QMenuBar {padding: 2px;}
+QMenuBar::item {background: transparent; padding: 4px;}
+QMenuBar::item:selected {padding: 4px; border-radius: 4px;}
+QMenuBar::item:pressed {padding: 4px; margin-bottom: 0; padding-bottom: 0;}
+
+/* QToolBar */
+/* QToolBar must override `border-style` to set the style. */
+QToolBar { padding: 1px; font-weight: bold; spacing: 2px; margin: 1px; border-style: none;}
+QToolBar::separator:horizontal {width: 2px; margin: 0 6px;}
+QToolBar::separator:vertical {height: 2px; margin: 6px 0;}
+QToolBar > QToolButton {background: transparent; padding: 3px; border-radius: 4px;}
+QToolBar > QToolButton::menu-button {border-top-right-radius: 4px; border-bottom-right-radius: 4px;}
+QToolBar > QWidget {background: transparent;}
+
+/* Qmenu Properties */
+QMenu {padding: 8px 0; border-radius: 4px;}
+QMenu::separator {margin: 4px 0; height: 1px;}
+QMenu::item {background: transparent; padding: 4px 19px;}
+QMenu::icon {padding-left: 10px; width: 14px; height: 14px;}
+
+/* QScrollBar */
+QScrollBar {border-radius: 4px;}
+QScrollBar:horizontal {height: 14px;}
+QScrollBar::handle {border-radius: 3px;}
+QScrollBar::handle:horizontal {min-width: 8px; margin: 4px 14px;}
+QScrollBar::handle:horizontal:hover {margin: 2px 14px;}
+QScrollBar::handle:vertical {min-height: 8px; margin: 14px 4px;}
+QScrollBar::handle:vertical:hover {margin: 14px 2px;}
+/*
+Hide QScrollBar background.
+The `sub-page` and `add-page` are not colored by default on most OS, but are colored on Windows.
+*/
+QScrollBar::sub-page, QScrollBar::add-page {background: transparent;}
+QScrollBar::sub-line, QScrollBar::add-line {background: transparent;}
+QPushButton, QToolButton {padding: 4px 8px; border-radius: 4px;}
+
+/* QDialogButtonBox */
+QDialogButtonBox {dialogbuttonbox-buttons-have-icons: 0;}
+QDialogButtonBox QPushButton {min-width: 65px;}
+
+/* QComboBox */
+QComboBox {min-height: 1.5em; padding: 0 8px 0 4px; border-radius: 4px;}
+QComboBox::drop-down {margin: 2px 2px 2px -6px; border-radius: 4px;  /* This remove default style. */}
+/* Setting background color of selected item when editable is false. */
+QComboBox::item:selected {border: none;  /* This remove the border of indicator. */ border-radius: 4px;}
+
+/* QAbstractItemView in QComboBox is NoFrame. Override default settings and show border. */
+QComboBox QListView {margin: 0; padding: 4px; border-radius: 4px;}
+QComboBox QListView::item {border-radius: 4px;}
+
+/* QListView QTreeView */
+QListView {padding: 1px}
+QTreeView::branch:open:has-children:!has-siblings, QTreeView::branch:open:has-children:has-siblings  {border-image: unset;}
+
+/*
+Following arrow settings are for QColumnView.
+QColumnView::left-arrow and QColumnView::right-arrow are not working.
+*/
+QListView::left-arrow {margin: -2px;}
+QListView::right-arrow {margin: -2px;}
+
+/* QTabWidget QTabBar */
+QTabWidget::pane {border-radius: 4px;}
+QTabBar {qproperty-drawBase: 0;}
+QTabBar::close-button:hover {border-radius: 4px;}
+QTabBar::tab {padding: 3px; border-style: solid;}
+QTabBar::tab:top {
+    border-bottom-width: 2px;
+    margin: 3px 6px 0 0;
+    border-top-left-radius: 2px;
+    border-top-right-radius: 2px;
+}
+QTabBar::tab:bottom {border-top-width: 2px; margin: 0 6px 3px 0; border-bottom-left-radius: 2px; border-bottom-right-radius: 2px;}
+QTabBar::tab:left {border-right-width: 2px; margin: 0 0 6px 3px; border-top-left-radius: 2px; border-bottom-left-radius: 2px;}
+QTabBar::tab:right {border-left-width: 2px; margin-bottom: 6px; margin: 0 3px 6px 0; border-top-right-radius: 2px; border-bottom-right-radius: 2px;}
+QTabBar::tab:top:first, QTabBar::tab:top:only-one, QTabBar::tab:bottom:first, QTabBar::tab:bottom:only-one {margin-left: 2px;}
+QTabBar::tab:top:last, QTabBar::tab:top:only-one, QTabBar::tab:bottom:last, QTabBar::tab:bottom:only-one {margin-right: 2px;}
+QTabBar::tab:left:first, QTabBar::tab:left:only-one, QTabBar::tab:right:first, QTabBar::tab:right:only-one {margin-top: 2px;}
+QTabBar::tab:left:last, QTabBar::tab:left:only-one, QTabBar::tab:right:last, QTabBar::tab:right:only-one {margin-bottom: 2px;}
+
+/* QColumnView */
+QColumnViewGrip {margin: -4px;}
+
+/* QTableView */
+QTableView QTableCornerButton::section {margin: 0 1px 1px 0; border-top-left-radius: 2px;}
+QTableView > QHeaderView {border-radius: 3px;}
+
+/* QLineEdit */
+/* Adjust the min-height of QLineEdit to the height of the characters. */
+QLineEdit {padding: 3px 4px; min-height: 1em; border-radius: 4px;}
+
+/* QFileDialog */
+QFileDialog QFrame {border: none;}
+
+/* Check */
+QComboBox::indicator,
+QMenu::indicator {width: 18px; height: 18px;}
+QMenu::indicator {margin-left: 3px; border-radius: 4px;}
+
+/* Check indicator */
+QCheckBox, QRadioButton {spacing: 8px;}
+QGroupBox::title, QAbstractItemView::item {spacing: 6px;}
+QCheckBox::indicator, QGroupBox::indicator, QAbstractItemView::indicator, QRadioButton::indicator {height: 18px; width: 18px;}
+QCheckBox::indicator:checked, QGroupBox::indicator:checked, QAbstractItemView::indicator:checked, QRadioButton::indicator:checked {height: 14px; width: 14px;}
+
+QProgressBar {border: 2px solid grey; border-radius: 5px; text-align: center}
+QProgressBar::chunk {background-color: #b1daf9; width: 10px; margin: 1px;}
+QTextBrowser[warning=true] {border: 5px solid red; background-color: lightyellow}
+QCodeEditor {font-family: 'monospace, monospace'}
+QCodeEditor[warning=true] {border: 5px solid red; background-color: lightyellow}
+QLabel[bold=true] {font-weight: bold;}
+QTreeView::item[base=true] {color: rgb(77,81,87); font-style: normal; font-weight: normal;}
+QTreeView::item[disabled=true] {font-style: italic;}
+QTreeView::item[constrained=true] {font-style: italic; color: blue;}
+QHeaderView {font-weight: bold}"""