PR: Initial support for Spyder's dark theme

README.md

@@ -244,6 +244,7 @@ a Python version greater than 2.7 or 3.4 (Python <=3.3 is no longer supported).
 * **Cloudpickle**: Serialize variables in the IPython kernel to send to Spyder.
 * **spyder-kernels** 1.0+: Jupyter kernels for the Spyder console.
 * **keyring**: Save Github credentials to report errors securely.
+* **QDarkStyle**: A dark stylesheet for Qt applications, used for Spyder's dark theme.
 * **pexpect**/**paramiko**: Connect to remote kernels through SSH.
 
 ### Optional dependencies

appveyor.yml

@@ -16,7 +16,7 @@ environment:
       sympy cython keyring
     PIP_DEPENDENCIES: >
       pytest-qt pytest-mock pytest-timeout flaky codecov
-      python-language-server[all]
+      python-language-server[all] qdarkstyle
     APPVEYOR_RDP_PASSWORD: "dcca4c4863E30d56c2e0dda6327370b3#"
 
   matrix:

continuous_integration/posix/install.sh

@@ -15,7 +15,7 @@ else
                                pytest pytest-cov numpydoc scipy cython pillow jedi pycodestyle sympy \
                                keyring pexpect"
     export PIP_DEPENDENCIES="coveralls pytest-qt pytest-mock pytest-timeout flaky \
-                             python-language-server[all]"
+                             python-language-server[all] qdarkstyle"
 fi
 
 

requirements/requirements.txt

@@ -15,3 +15,4 @@ pyqt5
 keyring
 spyder-kernels>=1.0
 python-language-server
+qdarkstyle

setup.py

@@ -225,6 +225,7 @@ def run(self):
     'pyqt5<5.10;python_version>="3"',
     # Pyls with all its dependencies
     'python-language-server[all]',
+    'qdarkstyle',
     # Required to get SSH connections to remote kernels
     'pexpect;platform_system!="Windows"',
     'paramiko;platform_system=="Windows"'

spyder/app/mainwindow.py

@@ -165,8 +165,7 @@
 from spyder.utils.misc import select_port, getcwd_or_home, get_python_executable
 from spyder.widgets.fileswitcher import FileSwitcher
 from spyder.plugins.lspmanager import LSPManager
-
-
+from spyder.config.gui import is_dark_font_color
 
 #==============================================================================
 # Local gui imports
@@ -188,6 +187,10 @@
 from spyder.otherplugins import get_spyderplugins_mods
 from spyder.app import tour
 
+#==============================================================================
+# Third-party library imports
+#==============================================================================
+import qdarkstyle
 
 #==============================================================================
 # Get the cwd before initializing WorkingDirectory, which sets it to the one
@@ -553,6 +556,16 @@ def create_toolbar(self, title, object_name, iconsize=24):
     def setup(self):
         """Setup main window"""
         self.debug_print("*** Start of MainWindow setup ***")
+        self.debug_print("  ..theme configuration")
+        color_theme = CONF.get('color_schemes', 'color_theme')
+        color_scheme = CONF.get('color_schemes', 'selected')
+        if color_theme == 'dark':
+            self.setStyleSheet(qdarkstyle.load_stylesheet_from_environment())
+        elif color_theme == 'automatic':
+            if not is_dark_font_color(color_scheme):
+                self.setStyleSheet(
+                        qdarkstyle.load_stylesheet_from_environment())
+
         self.debug_print("  ..core actions")
         self.close_dockwidget_action = create_action(self,
                                     icon=ima.icon('DialogCloseButton'),

spyder/config/gui.py

@@ -28,6 +28,8 @@
 from spyder.py3compat import to_text_string
 from spyder.utils import syntaxhighlighters as sh
 
+# Third-party imports
+from qtconsole.styles import dark_color
 
 # To save metadata about widget shortcuts (needed to build our
 # preferences page)
@@ -164,5 +166,12 @@ def set_default_color_scheme(name, replace=True):
     set_color_scheme(name, sh.get_color_scheme(name), replace=replace)
 
 
+def is_dark_font_color(color_scheme):
+    """Check if the font color used in the color scheme is dark."""
+    color_scheme = get_color_scheme(color_scheme)
+    font_color, fon_fw, fon_fs = color_scheme['normal']
+    return dark_color(font_color)
+
+
 for _name in sh.COLOR_SCHEME_NAMES:
     set_default_color_scheme(_name, replace=False)

spyder/config/main.py

@@ -465,6 +465,7 @@
               }),
             ('color_schemes',
              {
+              'color_theme': 'automatic',
               'names': ['emacs', 'idle', 'monokai', 'pydev', 'scintilla',
                         'spyder', 'spyder/dark', 'zenburn', 'solarized/light',
                         'solarized/dark'],

spyder/preferences/configdialog.py

@@ -40,6 +40,7 @@
 from spyder.widgets.colors import ColorLayout
 from spyder.widgets.comboboxes import FileComboBox
 from spyder.plugins.editor.widgets.codeeditor import CodeEditor
+from spyder.config.gui import is_dark_font_color
 
 
 HDPI_QT_PAGE = "https://doc.qt.io/qt-5/highdpi.html"
@@ -911,7 +912,6 @@ def setup_page(self):
         icons_combo = self.create_combobox(_('Icon theme'), icon_choices,
                                            'icon_theme', restart=True)
 
-
         vertdock_box = newcb(_("Vertical title bars in panes"),
                              'vertical_dockwidget_titlebars')
         verttabs_box = newcb(_("Vertical tabs in panes"),
@@ -1171,17 +1171,29 @@ def setup_page(self):
                                                        'selected')
         self.schemes_combobox = schemes_combobox_widget.combobox
 
-        # Layouts
-        vlayout = QVBoxLayout()
+        color_themes = ['Automatic', 'Light', 'Dark']
+        color_theme_choices = list(zip(color_themes,
+                                       [color_theme.lower()
+                                        for color_theme in color_themes]))
+        color_theme_combo = self.create_combobox(_('User interface theme:'),
+                                                 color_theme_choices,
+                                                 'color_theme',
+                                                 restart=True)
 
+        # Layouts
         manage_layout = QVBoxLayout()
         manage_layout.addWidget(about_label)
 
         combo_layout = QHBoxLayout()
         combo_layout.addWidget(schemes_combobox_widget.label)
         combo_layout.addWidget(schemes_combobox_widget.combobox)
 
+        color_theme_combo_layout = QHBoxLayout()
+        color_theme_combo_layout.addWidget(color_theme_combo.label)
+        color_theme_combo_layout.addWidget(color_theme_combo.combobox)
+
         buttons_layout = QVBoxLayout()
+        buttons_layout.addLayout(color_theme_combo_layout)
         buttons_layout.addLayout(combo_layout)
         buttons_layout.addWidget(edit_button)
         buttons_layout.addWidget(self.reset_button)
@@ -1200,6 +1212,7 @@ def setup_page(self):
         manage_group = QGroupBox(_("Manage color schemes"))
         manage_group.setLayout(manage_layout)
 
+        vlayout = QVBoxLayout()
         vlayout.addWidget(manage_group)
         self.setLayout(vlayout)
 
@@ -1223,15 +1236,46 @@ def setup_page(self):
 
     def apply_settings(self, options):
         self.set_option('selected', self.current_scheme)
-        self.main.editor.apply_plugin_settings(['color_scheme_name'])
-        if self.main.ipyconsole is not None:
-            self.main.ipyconsole.apply_plugin_settings(['color_scheme_name'])
-        if self.main.historylog is not None:
-            self.main.historylog.apply_plugin_settings(['color_scheme_name'])
-        if self.main.help is not None:
-            self.main.help.apply_plugin_settings(['color_scheme_name'])
-        self.update_combobox()
-        self.update_preview()
+        color_scheme = self.get_option('selected')
+        color_theme = self.get_option('color_theme')
+        style_sheet = self.main.styleSheet()
+        if color_theme == 'automatic':
+            if ((not is_dark_font_color(color_scheme) and not style_sheet)
+                    or (is_dark_font_color(color_scheme) and style_sheet)):
+                self.changed_options.add('color_theme')
+            elif 'color_theme' in self.changed_options:
+                self.changed_options.remove('color_theme')
+
+            if 'color_theme' not in self.changed_options:
+                self.main.editor.apply_plugin_settings(['color_scheme_name'])
+                if self.main.ipyconsole is not None:
+                    self.main.ipyconsole.apply_plugin_settings(
+                        ['color_scheme_name'])
+                if self.main.historylog is not None:
+                    self.main.historylog.apply_plugin_settings(
+                        ['color_scheme_name'])
+                if self.main.help is not None:
+                    self.main.help.apply_plugin_settings(['color_scheme_name'])
+                self.update_combobox()
+                self.update_preview()
+        else:
+            if 'color_theme' in self.changed_options:
+                if (style_sheet and color_theme == 'dark' or
+                        not style_sheet and color_theme == 'light'):
+                    self.changed_options.remove('color_theme')
+
+            if 'color_theme' not in self.changed_options:
+                self.main.editor.apply_plugin_settings(['color_scheme_name'])
+                if self.main.ipyconsole is not None:
+                    self.main.ipyconsole.apply_plugin_settings(
+                        ['color_scheme_name'])
+                if self.main.historylog is not None:
+                    self.main.historylog.apply_plugin_settings(
+                        ['color_scheme_name'])
+                if self.main.help is not None:
+                    self.main.help.apply_plugin_settings(['color_scheme_name'])
+                self.update_combobox()
+                self.update_preview()
 
     # Helpers
     # -------------------------------------------------------------------------
@@ -1532,6 +1576,8 @@ def add_color_scheme_stack(self, scheme_name, custom=False):
 
         if not custom:
             line_edit.textbox.setDisabled(True)
+        if not self.isVisible():
+            line_edit.setVisible(False)
 
         cs_layout = QVBoxLayout()
         cs_layout.addLayout(name_layout)