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, 32 insertions, 0 deletions

diff --git a/src/ShortcutManager.hh b/src/ShortcutManager.hh
new file mode 100644
index 0000000..792a66c
--- /dev/null
+++ b/src/ShortcutManager.hh
@@ -0,0 +1,32 @@
+#ifndef SHORTCUTMANAGER_HH
+#define SHORTCUTMANAGER_HH
+
+#include <map>
+
+class FluxboxWindow;
+
+class ShortcutManager {
+
+public:
+
+    ShortcutManager();
+
+    void setLastPlaceHolderKey(unsigned int lastPlaceHolderKey_);
+
+    unsigned int getLastPlaceHolderKey();
+
+    void mapKeyToWindow(unsigned int key, FluxboxWindow* window);
+
+    void removeWindow(FluxboxWindow* window);
+
+    FluxboxWindow* getWindowForKey(unsigned int key);
+
+private:
+
+    typedef std::map<unsigned int, FluxboxWindow*> KeyToWindowMap;
+
+    unsigned int m_last_placeholder_key;
+    KeyToWindowMap m_key_to_window_map;
+};
+
+#endif