Initial implementation of shortcut to windows

[PURPOSE]

In editors such as vi and emacs, a user can mark a line in a file with
a shortcut key and afterwards jump back to that line using the shortcut.

The idea is extended to opened windows. A user can assign a keyboard
shortcut to an opened window.  Afterwards, the shortcut can be used to
switch focus back to the marked window.

Such shortcuts save the user from pressing "alt+tab" multiple times to
cycle through windows until the desired one is found.

[EXAMPLE USAGE]

The following binding is added to file "~/.fluxbox/keys":

    Mod1 m ARG :MarkWindow

    Mod1 g ARG :GotoMarkedWindow

User enters "alt+m x" to mark the currently focused window with shortcut
key 'x'

User enters "alt+g x" to switch focus to the marked window

[IMPLEMENTATION SUMMARY]

- Two new commands were added :MarkWindow and :GotoMarkedWindow

- Keys.cc was modified:
    - addBinding() method supports parsing an argument placeholder where
      the user can pass in a shortcut key
    - doAction() method forwards the shortcut key to the command to execute
    - Class Keys::t_key was modified to recognize a placeholder key

- New class ShortcutManager was added to maintain mapping of shortcut
  keys to marked windows

1 files changed, 3 insertions, 0 deletions

diff --git a/src/fluxbox.hh b/src/fluxbox.hh
index 42739fb..d300102 100644
--- a/src/fluxbox.hh
+++ b/src/fluxbox.hh
@@ -32,6 +32,7 @@
 #include "FbTk/MenuSearch.hh"
 
 #include "AttentionNoticeHandler.hh"
+#include "ShortcutManager.hh"
 
 #include <X11/Xresource.h>
 
@@ -185,6 +186,7 @@ public:
     const XEvent &lastEvent() const { return m_last_event; }
 
     AttentionNoticeHandler &attentionHandler() { return m_attention_handler; }
+    ShortcutManager &shortcutManager() { return *m_shortcut_manager; }
 
 private:
     std::string getRcFilename();
@@ -306,6 +308,7 @@ private:
     } m_state;
 
     int m_server_grabs;
+    std::unique_ptr<ShortcutManager> m_shortcut_manager;
 };