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Use GtkShortcutsWindow for Help tool. #11085

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Merged
merged 1 commit into from
Apr 22, 2018
Merged

Use GtkShortcutsWindow for Help tool. #11085

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69 changes: 68 additions & 1 deletion lib/matplotlib/backends/backend_gtk3.py
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Original file line number Diff line number Diff line change
Expand Up @@ -847,14 +847,81 @@ def trigger(self, sender, event, data=None):


class HelpGTK3(backend_tools.ToolHelpBase):
def trigger(self, *args):
def _normalize_shortcut(self, key):
"""
Convert Matplotlib key presses to GTK+ accelerator identifiers.

Related to `FigureCanvasGTK3._get_key`.
"""
special = {
'backspace': 'BackSpace',
'pagedown': 'Page_Down',
'pageup': 'Page_Up',
'scroll_lock': 'Scroll_Lock',
}

parts = key.split('+')
mods = ['<' + mod + '>' for mod in parts[:-1]]
key = parts[-1]

if key in special:
key = special[key]
elif len(key) > 1:
key = key.capitalize()
elif key.isupper():
mods += ['<shift>']

return ''.join(mods) + key

def _show_shortcuts_window(self):
section = Gtk.ShortcutsSection()

for name, tool in sorted(self.toolmanager.tools.items()):
if not tool.description:
continue

# Putting everything in a separate group allows GTK to
# automatically split them into separate columns/pages, which is
# useful because we have lots of shortcuts, some with many keys
# that are very wide.
group = Gtk.ShortcutsGroup()
section.add(group)
# A hack to remove the title since we have no group naming.
group.forall(lambda widget, data: widget.set_visible(False), None)

shortcut = Gtk.ShortcutsShortcut(
accelerator=' '.join(
self._normalize_shortcut(key)
for key in self.toolmanager.get_tool_keymap(name)
# Will never be sent:
if 'cmd+' not in key),
title=tool.name,
subtitle=tool.description)
group.add(shortcut)

window = Gtk.ShortcutsWindow(
title='Help',
modal=True,
transient_for=self._figure.canvas.get_toplevel())
section.show() # Must be done explicitly before add!
window.add(section)

window.show_all()

def _show_shortcuts_dialog(self):
dialog = Gtk.MessageDialog(
self._figure.canvas.get_toplevel(),
0, Gtk.MessageType.INFO, Gtk.ButtonsType.OK, self._get_help_text(),
title="Help")
dialog.run()
dialog.destroy()

def trigger(self, *args):
if Gtk.check_version(3, 20, 0) is None:
self._show_shortcuts_window()
else:
self._show_shortcuts_dialog()


# Define the file to use as the GTk icon
if sys.platform == 'win32':
Expand Down