+/**
+ * Main window (main module) is the place to contain and display viewers.
+ * Viewers (lttv modules) interacter with main window though API of the
+ * main window and hooks of itself.
+ * This header file should be included in each graphic module.
+ */
+
+#include <gtk/gtk.h>
+#include <ltt/ltt.h>
+#include <lttv/hook.h>
+
+/**
+ * Function to register a view constructor so that main window can generate
+ * a toolbar item for the viewer in order to generate a new instance easily.
+ * It will be called by init function of the module.
+ * @param pixmap, pixmap shown on the toolbar item.
+ * @param tooltip, tooltip of the toolbar item.
+ * @view_constructor, constructor of the viewer.
+ */
+
+void ToolbarItemReg(GdkPixmap *pixmap, char *tooltip, void *view_constructor);
+
+
+/**
+ * Function to unregister the viewer's constructor, release the space
+ * occupied by pixmap, tooltip and constructor of the viewer.
+ * It will be called when a module is unloaded.
+ * @param view_constructor, constructor of the viewer which is used as
+ * a reference to find out where the pixmap and tooltip are.
+ */
+
+void ToolbarItemUnreg(void *view_constructor);
+
+
+/**
+ * Function to register a view constructor so that main window can generate
+ * a menu item for the viewer in order to generate a new instance easily.
+ * It will be called by init function of the module.
+ * @param menu_path, path of the menu item.
+ * @param menu_text, text of the menu item.
+ * @view_constructor, constructor of the viewer.
+ */
+
+void MenuItemReg(char *menu_path, char *menu_text, void *view_constructor);
+
+
+/**
+ * Function to unregister the viewer's constructor, release the space
+ * occupied by menu_path, menu_text and constructor of the viewer.
+ * It will be called when a module is unloaded.
+ * @param view_constructor, constructor of the viewer which is used as
+ * a reference to find out where the menu_path and menu_text are.
+ */
+
+void MenuItemUnreg(void *view_constructor);
+
+
+/**
+ * Attach a viewer to the current tab.
+ * It will be called in the constructor of the viewer.
+ * @param main_win, the main window the viewer belongs to.
+ * @param viewer, viewer to be attached to the current tab
+ */
+
+void AttachViewer(MainWindow *main_win, GtkWidget *viewer);
+
+
+/* ?? Maybe we do not need this function, when a widget is destoried,
+ * it will be removed automatically from its container
+ */
+
+/**
+ * Detach a viewer from the current tab.
+ * It will be called in the destructor of the viewer.
+ * @param main_win, the main window the viewer belongs to.
+ * @param viewer, viewer to be detached from the current tab.
+ */
+
+void DetachViewer(MainWindow *main_win, GtkWidget *viewer);
+
+
+/**
+ * Update the status bar whenever something changed in the viewer.
+ * @param main_win, the main window the viewer belongs to.
+ * @param info, the message which will be shown in the status bar.
+ */
+
+void UpdateStatus(MainWindow *main_win, char *info);
+
+
+/**
+ * Function to get the current time interval of the current tab.
+ * It will be called by a viewer's hook function to update the
+ * time interval of the viewer and also be called by the constructor
+ * of the viewer.
+ * @param main_win, the main window the viewer belongs to.
+ * @param time_interval, a pointer where time interval will be stored.
+ */
+
+void GetTimeInterval(MainWindow *main_win, TimeInterval *time_interval);
+
+
+/**
+ * Function to set the time interval of the current tab.
+ * It will be called by a viewer's signal handle associated with
+ * the move_slider signal
+ * @param main_win, the main window the viewer belongs to.
+ * @param time_interval, a pointer where time interval is stored.
+ */
+
+void SetTimeInterval(MainWindow *main_win, TimeInterval *time_interval);
+
+
+/**
+ * Function to get the current time/event of the current tab.
+ * It will be called by a viewer's hook function to update the
+ * current time/event of the viewer.
+ * @param main_win, the main window the viewer belongs to.
+ * @param ltt_time, a pointer where time will be stored.
+ */
+
+void GetCurrentTime(MainWindow *main_win, ltt_time *time);
+
+
+/**
+ * Function to set the current time/event of the current tab.
+ * It will be called by a viewer's signal handle associated with
+ * the button-release-event signal
+ * @param main_win, the main window the viewer belongs to.
+ * @param ltt_time, a pointer where time is stored.
+ */
+
+void SetCurrentTime(MainWindow *main_win, ltt_time *time);
+
+
+/**
+ * Function to get the traceset from the current tab.
+ * It will be called by the constructor of the viewer and also be
+ * called by a hook funtion of the viewer to update its traceset.
+ * @param main_win, the main window the viewer belongs to.
+ * @param traceset, a pointer to a traceset.
+ */
+
+void GetTraceset(MainWindow *main_win, Traceset *traceset);
+
+
+/**
+ * Function to get the filter of the current tab.
+ * It will be called by the constructor of the viewer and also be
+ * called by a hook funtion of the viewer to update its filter.
+ * @param main_win, the main window the viewer belongs to.
+ * @param filter, a pointer to a filter.
+ */
+
+void GetFilter(MainWindow *main_win, Filter *filter);
+
+
+/**
+ * Function to register a hook function for a viewer to set/update its
+ * time interval.
+ * It will be called by the constructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void RegUpdateTimeInterval(lttv_hook *hook, TimeInterval *hook_data,
+ MainWindow * main_win);
+
+
+/**
+ * Function to unregister a viewer's hook function which is used to
+ * set/update the time interval of the viewer.
+ * It will be called by the destructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void UnregUpdateTimeInterval(lttv_hook *hook, TimeInterval *hook_data,
+ MainWindow * main_win);
+
+
+/**
+ * Function to register a hook function for a viewer to set/update its
+ * traceset.
+ * It will be called by the constructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void RegUpdateTraceset(lttv_hook *hook, Traceset *hook_data,
+ MainWindow * main_win);
+
+
+/**
+ * Function to unregister a viewer's hook function which is used to
+ * set/update the traceset of the viewer.
+ * It will be called by the destructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void UnregUpdateTraceset(lttv_hook *hook, Traceset *hook_data,
+ MainWindow * main_win);
+
+
+/**
+ * Function to register a hook function for a viewer to set/update its
+ * filter.
+ * It will be called by the constructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void RegUpdateFilter(lttv_hook *hook, Filter *hook_data,
+ MainWindow *main_win);
+
+
+/**
+ * Function to unregister a viewer's hook function which is used to
+ * set/update the filter of the viewer.
+ * It will be called by the destructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void UnregUpdateFilter(lttv_hook *hook, Filter *hook_data,
+ MainWindow * main_win);
+
+
+/**
+ * Function to register a hook function for a viewer to set/update its
+ * current time.
+ * It will be called by the constructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void RegUpdateCurrentTime(lttv_hook *hook, ltt_time *hook_data,
+ MainWindow *main_win);
+
+
+/**
+ * Function to unregister a viewer's hook function which is used to
+ * set/update the current time of the viewer.
+ * It will be called by the destructor of the viewer.
+ * @param hook, hook function of the viewer.
+ * @param hook_data, hook data associated with the hook function.
+ * @param main_win, the main window the viewer belongs to.
+ */
+
+void UnregUpdateCurrentTime(lttv_hook *hook, ltt_time *hook_data,
+ MainWindow * main_win);
+
+