Merge from 3.x: PR #3464

Fixes #3275

spyder/app/mainwindow.py

@@ -935,6 +935,10 @@ def create_edit_action(text, tr_text, icon):
         else:
             tut_action = None
 
+        shortcuts_action = create_action(self, _("Shortcuts Summary"),
+                                         shortcut="Meta+F1",
+                                         triggered=self.show_shortcuts_dialog)
+
         #----- Tours
         self.tour = tour.AnimatedTour(self)
         self.tours_menu = QMenu(_("Interactive tours"))
@@ -956,7 +960,8 @@ def trigger(i=i, self=self):  # closure needed!
 
         self.tours_menu.addActions(self.tour_menu_actions)
 
-        self.help_menu_actions = [doc_action, tut_action, self.tours_menu,
+        self.help_menu_actions = [doc_action, tut_action, shortcuts_action,
+                                  self.tours_menu,
                                   MENU_SEPARATOR, report_action, dep_action,
                                   self.check_updates_action, support_action,
                                   MENU_SEPARATOR]
@@ -2624,6 +2629,12 @@ def apply_shortcuts(self):
         for index in sorted(toberemoved, reverse=True):
             self.shortcut_data.pop(index)
 
+    @Slot()
+    def show_shortcuts_dialog(self):
+        from spyder.widgets.shortcutssummary import ShortcutsSummaryDialog
+        dlg = ShortcutsSummaryDialog(None)
+        dlg.exec_()
+
     # -- Open files server
     def start_open_files_server(self):
         self.open_files_server.setsockopt(socket.SOL_SOCKET,

spyder/widgets/shortcutssummary.py

@@ -0,0 +1,161 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright © 2009- The Spyder Development Team
+# Licensed under the terms of the MIT License
+# (see spyder/__init__.py for details)
+
+"""Shortcut Summary dialog"""
+
+
+# Standard library imports
+from operator import itemgetter
+from itertools import groupby
+
+# Third party imports
+from qtpy.QtCore import Qt
+from qtpy.QtGui import QFont
+from qtpy.QtWidgets import (QDialog, QLabel, QGridLayout, QGroupBox,
+                            QVBoxLayout, QHBoxLayout, QDesktopWidget, 
+                            QScrollArea, QWidget)
+
+# Local imports
+from spyder.config.base import _
+from spyder.config.gui import iter_shortcuts
+
+# Constants
+MAX_FONT_SIZE = 16
+MIN_FONT_SIZE = 8
+
+class ShortcutsSummaryDialog(QDialog):
+    """
+    Dialog window listing the spyder and plugins shortcuts.
+
+    It contains all the shortcuts avalaible through iter_shortcuts
+    function
+
+    The shortcuts are dysplayed in different columns, and grouped by
+    context (global, editor, console...)
+    """
+    def __init__(self, parent=None):
+        QDialog.__init__(self, parent=parent)
+
+        self._shortcuts_summary_title = _("Spyder Keyboard ShortCuts")
+
+        # Calculate font and amount of elements in each column according screen size
+        width, height = self.get_screen_resolution()
+        font_size = height / 80
+        font_size = max(min(font_size, MAX_FONT_SIZE), MIN_FONT_SIZE)
+        shortcuts_column = (height - 8 * font_size) / (font_size +16)
+
+        # Widgets
+        style = """
+            QDialog {
+              margin:0px;
+              padding:0px;
+              border-radius: 2px;
+            }"""
+        self.setStyleSheet(style)
+
+        font_names = QFont()
+        font_names.setPointSize(font_size)
+        font_names.setBold(True)
+
+        font_keystr = QFont()
+        font_keystr.setPointSize(font_size)
+
+        font_title = QFont()
+        font_title.setPointSize(font_size+2)
+        font_title.setBold(True)
+
+        title_label = QLabel(self._shortcuts_summary_title)
+        title_label.setAlignment(Qt.AlignCenter)
+        title_label.setFont(font_title)
+
+        # iter over shortcuts and create GroupBox for each context
+        # with shortcuts in a grid
+
+        columns_layout = QHBoxLayout()
+        added_shortcuts = 0
+        group = None
+        # group shortcuts by context
+        shortcuts = groupby(sorted(iter_shortcuts()), key=itemgetter(0))
+
+        for context, group_shortcuts in shortcuts:
+            for i, (context, name, keystr) in enumerate(group_shortcuts):
+                # start of every column
+                if added_shortcuts == 0:
+                    column_layout = QVBoxLayout()
+
+                # at start of new context add previous context group
+                if i == 0 and added_shortcuts > 0:
+                    column_layout.addWidget(group)
+
+                # create group at start of column or context
+                if added_shortcuts == 0 or i == 0:
+                    if context == '_': context = 'Global'
+
+                    group = QGroupBox(context.capitalize())
+                    group.setFont(font_names)
+
+                    group_layout = QGridLayout()
+                    group.setLayout(group_layout)
+
+                    # Count space for titles
+                    added_shortcuts += 1
+
+                # Widgets
+                label_name = QLabel(name.capitalize().replace('_', ' '))
+                label_name.setFont(font_names)
+                label_keystr = QLabel(keystr)
+                label_keystr.setFont(font_keystr)
+
+                group_layout.addWidget(label_name, i, 0)
+                group_layout.addWidget(label_keystr, i, 1)
+
+                added_shortcuts += 1
+
+                if added_shortcuts >= shortcuts_column:
+                    column_layout.addWidget(group)
+                    columns_layout.addLayout(column_layout)
+                    added_shortcuts = 0
+
+        column_layout.addWidget(group)
+        column_layout.addStretch()  # avoid lasts sections to appear too big
+        columns_layout.addLayout(column_layout)
+
+        # Scroll widget
+        self.scroll_widget = QWidget()
+        self.scroll_widget.setLayout(columns_layout)
+        self.scroll_area = QScrollArea()
+        self.scroll_area.setWidget(self.scroll_widget)
+
+        # widget setup
+        self.setWindowFlags(Qt.FramelessWindowHint)
+        self.setWindowOpacity(0.95)
+
+        # layout
+        self._layout = QVBoxLayout()
+        self._layout.addWidget(title_label)
+
+        self._layout.addWidget(self.scroll_area)
+        self.setLayout(self._layout)
+
+        self.setGeometry(0, 0, width, height)
+
+    def get_screen_resolution(self):
+        """Return the screen resolution of the primary screen."""
+        widget = QDesktopWidget()
+        geometry = widget.availableGeometry(widget.primaryScreen())
+        return geometry.width(), geometry.height()
+
+
+def test():  # pragma: no cover
+    from spyder.utils.qthelpers import qapplication
+    app = qapplication()
+    dlg_shortcuts = ShortcutsSummaryDialog(None)
+    dlg_shortcuts.show()
+    app.exec_()
+
+
+if __name__ == "__main__":  # pragma: no cover
+    test()