Add a ShortcutsWindow and tooltips to display accelerators

The GtkShortcutsWindow is shown upon pressing `?`.
This is only available in Gtk+ >= 3.20.
For earlier versions nothing happens.

1 files changed, 59 insertions, 0 deletions

diff --git a/voctogui/lib/shortcuts.py b/voctogui/lib/shortcuts.py
new file mode 100644
index 0000000..d591a03
--- /dev/null
+++ b/voctogui/lib/shortcuts.py
@@ -0,0 +1,59 @@
+from gi.repository import Gtk
+
+from lib.config import Config
+
+
+class ShortcutsWindow(Gtk.ShortcutsWindow):
+    def __init__(self, win):
+        Gtk.ShortcutsWindow.__init__(self)
+        self.build()
+        self.set_position(Gtk.WindowPosition.CENTER_ALWAYS)
+        self.set_transient_for(win)
+        self.set_modal(True)
+
+    def build(self):
+        section = Gtk.ShortcutsSection()
+        section.show()
+
+        compose_group = Gtk.ShortcutsGroup(title="Composition modes")
+        compose_group.show()
+        for accel, desc in [("F1", "Select fullscreen mode"),
+                            ("F2", "Select Picture in Picture mode"),
+                            ("F3", "Select  Side-by-Side Equal mode"),
+                            ("F4", "Select  Side-by-Side Preview mode")]:
+            short = Gtk.ShortcutsShortcut(title=desc, accelerator=accel)
+            short.show()
+            compose_group.add(short)
+        section.add(compose_group)
+
+        source_group = Gtk.ShortcutsGroup(title="Source Selection")
+        source_group.show()
+        num = len(Config.getlist('mix', 'sources'))
+        source_items = [
+            ("1...{}".format(num), "Select Source as A-Source"),
+            ("<ctrl>1...<ctrl>{}".format(num), "Select Source as B-Source"),
+            ("<alt>1...<alt>{}".format(num), "Select Source as Fullscreen")
+        ]
+        for accel, desc in source_items:
+            short = Gtk.ShortcutsShortcut(title=desc, accelerator=accel)
+            short.show()
+            source_group.add(short)
+        section.add(source_group)
+
+        if Config.getboolean('misc', 'cut'):
+            other_group = Gtk.ShortcutsGroup(title="Other")
+            other_group.show()
+            short = Gtk.ShortcutsShortcut(title="Send Cut message",
+                                          accelerator="t")
+            short.show()
+            other_group.add(short)
+            section.add(other_group)
+
+        self.add(section)
+
+
+def show_shortcuts(win):
+    if not hasattr(Gtk, "ShortcutsWindow"):
+        return
+    shortcuts_window = ShortcutsWindow(win)
+    shortcuts_window.show()