Add documentation comments.

desktop/global_history.h

@@ -23,15 +23,54 @@
 
 #include "desktop/core_window.h"
 
+
+/**
+ * Initialise the global history.
+ *
+ * This iterates through the URL database, generating the global history data,
+ * and creates a treeview.
+ *
+ * This must be called before any other global_history_* function.
+ *
+ * \param cw_t		Callback table for core_window containing the treeview
+ * \param cw		The core_window in which the treeview is shown
+ * \return NSERROR_OK on success, appropriate error otherwise
+ */
 nserror global_history_init(struct core_window_callback_table *cw_t,
 		void *core_window_handle);
 
+/**
+ * Finalise the global history.
+ *
+ * This destroys the global history treeview and the global history module's
+ * internal data.  After calling this if global history is required again,
+ * global_history_init must be called.
+ *
+ * \param cw_t		Callback table for core_window containing the treeview
+ * \param cw		The core_window in which the treeview is shown
+ * \return NSERROR_OK on success, appropriate error otherwise
+ */
 nserror global_history_fini(struct core_window_callback_table *cw_t,
 		void *core_window_handle);
 
+/**
+ * Redraw the global history.
+ *
+ * \param x		X coordinate to render treeview at
+ * \param x		Y coordinate to render treeview at
+ * \param clip		Current clip rectangle (wrt tree origin)
+ * \param ctx		Current redraw context
+ */
 void global_history_redraw(int x, int y, struct rect *clip,
 		const struct redraw_context *ctx);
 
+/**
+ * Handles all kinds of mouse action
+ *
+ * \param mouse		The current mouse state
+ * \param x		X coordinate
+ * \param y		Y coordinate
+ */
 void global_history_mouse_action(browser_mouse_state mouse, int x, int y);
 
 #endif