ltt/branches/poly/lttv/modules/gui/lttvwindow/lttvwindow/lttvwindow.h

   1 /* This file is part of the Linux Trace Toolkit Graphic User Interface
   2  * Copyright (C) 2003-2004 Xiangxiu Yang, Mathieu Desnoyers
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  16  * MA 02111-1307, USA.
  17  */
  18
  19 /*
  20 This file is what every viewer plugin writer should refer to.
  21
  22
  23 Module Related API
  24
  25 A viewer plugin is, before anything, a plugin. As a dynamically loadable
  26 module, it thus has an init and a destroy function called whenever it is
  27 loaded/initialized and unloaded/destroyed. A graphical module depends on
  28 lttvwindow for construction of its viewer instances. In order to achieve
  29 this, it must register its constructor function to the main window along
  30 with button description or text menu entry description. A module keeps
  31 a list of every viewer that currently sits in memory so it can destroy
  32 them before the module gets unloaded/destroyed.
  33
  34 The contructor registration to the main windows adds button and menu
  35 entry to each main window, thus allowing instanciation of viewers.
  36
  37
  38 Main Window
  39
  40 The main window is a container that offers menus, buttons and a
  41 notebook. Some of those menus and buttons are part of the core of the
  42 main window, others are dynamically added and removed when modules are
  43 loaded/unloaded.
  44
  45 The notebook contains as much tabs as wanted. Each tab is linked with
  46 a set of traces (traceset). Each trace contains many tracefiles (one
  47 per cpu).  A trace corresponds to a kernel being traced. A traceset
  48 corresponds to many traces read together. The time span of a traceset
  49 goes from the earliest start of all the traces to the latest end of all
  50 the traces.
  51
  52 Inside each tab are added the viewers. When they interact with the main
  53 window through the lttvwindow API, they affect the other viewers located
  54 in the same tab as they are.
  55
  56 The insertion of many viewers in a tab permits a quick look at all the
  57 information wanted in a glance. The main window does merge the read
  58 requests from all the viewers in the same tab in a way that every viewer
  59 will get exactly the events it asked for, while the event reading loop
  60 and state update are shared. It improves performance of events delivery
  61 to the viewers.
  62
  63
  64
  65 Viewer Instance Related API
  66
  67 The lifetime of a viewer is as follows. The viewer constructor function
  68 is called each time an instance view is created (one subwindow of this
  69 viewer type is created by the user either by clicking on the menu item
  70 or the button corresponding to the viewer). Thereafter, the viewer gets
  71 hooks called for different purposes by the window containing it. These
  72 hooks are detailed below. It also has to deal with GTK Events. Finally,
  73 it can be destructed by having its top level widget unreferenced by the
  74 main window or by any GTK Event causing a "destroy-event" signal on the
  75 its top widget. Another possible way for it do be destroyed is if the
  76 module gets unloaded. The module unload function will have to emit a
  77 "destroy" signal on each top level widget of all instances of its viewers.
  78
  79
  80 Notices from Main Window
  81
  82 time_window : This is the time interval visible on the viewer's tab. Every
  83               viewer that cares about being synchronised by respect to the
  84               time with other viewers should register to this notification.
  85               They should redraw all or part of their display when this occurs.
  86
  87 traceset :    This notification is called whenever a trace is added/removed
  88               from the traceset. As it affects all the data displayed by the
  89               viewer, it sould redraw itself totally.
  90
  91 filter :      FIXME : describe..
  92
  93 current_time: Being able to zoom nearer a specific time or highlight a specific
  94               time on every viewer in synchronicity implies that the viewer
  95               has to shown a visual sign over the drawing or select an event
  96               when it receives this notice. It should also inform the main
  97               window with the appropriate report API function when a user
  98               selects a specific time as being the current time.
  99
 100 dividor :     This notice links the positions of the horizontal dividors
 101               between the graphic display zone of every viewer and their Y axis,
 102               typically showing processes, cpus, ...
 103
 104
 105 Reporting Changes to the Main Window
 106
 107 In most cases, the enclosing window knows about updates such as described
 108 in the Notification section higher. There are a few cases, however, where
 109 updates are caused by actions known by a view instance. For example,
 110 clicking in a view may update the current time; all viewers within
 111 the same window must be told about the new current time to change the
 112 currently highlighted time point. A viewer reports such events by calling
 113 lttvwindow_report_current_time on its lttvwindow.  The lttvwindow will
 114 consequently call current_time_notify for each of its contained viewers.
 115
 116
 117 Available report methods are :
 118
 119 lttvwindow_report_time_window : reports the new time window.
 120 lttvwindow_report_current_time : reports the new current time.
 121 lttvwindow_report_dividor : reports the new horizontal dividor's position.
 122 lttvwindow_report_focus : One on the widgets in the viewer has the keyboard's
 123                           focus from GTK.
 124
 125
 126
 127 Requesting Events to Main Window
 128
 129 Events can be requested by passing a EventsRequest structure to the main
 130 window.  They will be delivered later when the next g_idle functions
 131 will be called.  Event delivery is done by calling the event hook for
 132 this event ID, or the main event hooks. A pointer to the EventsRequest
 133 structure is passed as hook_data to the event hooks of the viewers.
 134
 135 EventsRequest consists in
 136 - a pointer to the viewer specific data structure
 137 - a start timestamp or position
 138 - a stop_flag, ending the read process when set to TRUE
 139 - a end timestamp and/or position and/or number of events to read
 140 - hook lists to call for traceset/trace/tracefile begin and end, and for each
 141   event (event hooks and event_by_id hooks).
 142
 143 The main window will deliver events for every EventRequests it has
 144 pending through an algorithm that guarantee that all events requested,
 145 and only them, will be delivered to the viewer between the call of the
 146 tracefile_begin hooks and the call of the tracefile_end hooks.
 147
 148 If a viewer wants to stop the event request at a certain point inside the
 149 event hooks, it has to set the stop_flag to TRUE and return TRUE from the
 150 hook function. Then return value will stop the process traceset. Then,
 151 the main window will look for the stop_flag and remove the EventRequests
 152 from its lists, calling the process_traceset_end for this request (it
 153 removes hooks from the context and calls the after hooks).
 154
 155 It no stop_flag is risen, the end timestamp, end position or number
 156 of events to read has to be reached to determine the end of the
 157 request. Otherwise, the end of traceset does determine it.
 158
 159
 160 GTK Events
 161
 162 Events and Signals
 163
 164 GTK is quite different from the other graphical toolkits around
 165 there. The main difference resides in that there are many X Windows
 166 inside one GtkWindow, instead of just one. That means that X events are
 167 delivered by the glib main loop directly to the widget corresponding to
 168 the GdkWindow affected by the X event.
 169
 170 Event delivery to a widget emits a signal on that widget. Then, if a
 171 handler is connected to this widget's signal, it will be executed. There
 172 are default handlers for signals, connected at class instantiation
 173 time. There is also the possibility to connect other handlers to these
 174 signals, which is what should be done in most cases when a viewer needs
 175 to interact with X in any way.
 176
 177
 178
 179 Signal emission and propagation is described there :
 180
 181 http://www.gtk.org/tutorial/sec-signalemissionandpropagation.html
 182
 183 For further information on the GTK main loop (now a wrapper over glib main loop)
 184 see :
 185
 186 http://developer.gnome.org/doc/API/2.0/gtk/gtk-General.html
 187 http://developer.gnome.org/doc/API/2.0/glib/glib-The-Main-Event-Loop.html
 188
 189
 190 For documentation on event handling in GTK/GDK, see :
 191
 192 http://developer.gnome.org/doc/API/2.0/gdk/gdk-Events.html
 193 http://developer.gnome.org/doc/API/2.0/gdk/gdk-Event-Structures.html
 194
 195
 196 Signals can be connected to handlers, emitted, propagated, blocked,
 197 stopped. See :
 198
 199 http://developer.gnome.org/doc/API/2.0/gobject/gobject-Signals.html
 200
 201
 202
 203
 204 The "expose_event"
 205
 206 Provides the exposed region in the GdkEventExpose structure.
 207
 208 There are two ways of dealing with exposures. The first one is to directly
 209 draw on the screen and the second one is to draw in a pixmap buffer,
 210 and then to update the screen when necessary.
 211
 212 In the first case, the expose event will be responsible for registering
 213 hooks to process_traceset and require time intervals to the main
 214 window. So, in this scenario, if a part of the screen is damaged, the
 215 trace has to be read to redraw the screen.
 216
 217 In the second case, with a pixmap buffer, the expose handler is only
 218 responsible of showing the pixmap buffer on the screen. If the pixmap
 219 buffer has never been filled with a drawing, the expose handler may ask
 220 for it to be filled.
 221
 222 The interest of using events request to the main window instead of reading
 223 the events directly from the trace comes from the fact that the main
 224 window does merge requests from the different viewers in the same tab so
 225 that the read loop and the state update is shared. As viewers will, in
 226 the common scenario, request the same events, only one pass through the
 227 trace that will call the right hooks for the right intervals will be done.
 228
 229 When the traceset read is over for a events request, the traceset_end
 230 hook is called. It has the responsibility of finishing the drawing if
 231 some parts still need to be drawn and to show it on the screen (if the
 232 viewer uses a pixmap buffer).
 233
 234 It can add dotted lines and such visual effects to enhance the user's
 235 experience.
 236
 237
 238 FIXME : explain other important events
 239
 240 */
 241
 242
 243 #ifndef VIEWER_H
 244 #define VIEWER_H
 245
 246 /*! \file lttvwindow.h
 247  * \brief API used by the graphical viewers to interact with their top window.
 248  *
 249  * Main window (lttvwindow module) is the place to contain and display viewers.
 250  * Viewers (lttv plugins) interact with main window through this API.
 251  * This header file should be included in each graphic module.
 252  *
 253  */
 254
 255 #include <gtk/gtk.h>
 256 #include <ltt/ltt.h>
 257 #include <ltt/time.h>
 258 #include <lttv/hook.h>
 259 #include <lttv/tracecontext.h>
 260 #include <lttv/stats.h>
 261 #include <lttvwindow/mainwindow.h>
 262 #include <lttvwindow/lttvfilter.h>
 263 //FIXME (not ready yet) #include <lttv/filter.h>
 264
 265 /* Module Related API */
 266
 267
 268 /* constructor a the viewer */
 269 //FIXME explain LttvTracesetSelector and key
 270 typedef GtkWidget * (*lttvwindow_viewer_constructor)
 271                 (Tab *tab, LttvTracesetSelector * s, char *key);
 272
 273
 274 /**
 275  * Function to register a view constructor so that main window can generate
 276  * a menu item and a toolbar item for the viewer in order to generate a new
 277  * instance easily. A menu entry and toolbar item will be added to each main
 278  * window.
 279  *
 280  * It should be called by init function of the module.
 281  *
 282  * @param menu_path path of the menu item. NULL : no menu entry.
 283  * @param menu_text text of the menu item.
 284  * @param pixmap Image shown on the toolbar item. NULL : no button.
 285  * @param tooltip tooltip of the toolbar item.
 286  * @param view_constructor constructor of the viewer.
 287  */
 288
 289 void lttvwindow_register_constructor
 290                             (char *  menu_path,
 291                              char *  menu_text,
 292                              char ** pixmap,
 293                              char *  tooltip,
 294                              lttvwindow_viewer_constructor view_constructor);
 295
 296
 297 /**
 298  * Function to unregister the viewer's constructor, release the space
 299  * occupied by menu_path, menu_text, pixmap, tooltip and constructor of the
 300  * viewer.
 301  *
 302  * It will be called when a module is unloaded.
 303  *
 304  * @param view_constructor constructor of the viewer.
 305  */
 306
 307 void lttvwindow_unregister_constructor
 308                             (lttvwindow_viewer_constructor view_constructor);
 309
 310
 311
 312
 313 /* Viewer Instance Related API */
 314
 315 /**
 316  * Structure used as hook_data for the time_window_notify hook.
 317  */
 318 typedef struct _TimeWindowNotifyData {
 319   TimeWindow *new_time_window;
 320   TimeWindow *old_time_window;
 321 } TimeWindowNotifyData;
 322
 323
 324 /**
 325  * Function to register a hook function that will be called by the main window
 326  * when the time interval needs to be updated.
 327  *
 328  * This register function is typically called by the constructor of the viewer.
 329  *
 330  * @param tab the tab the viewer belongs to.
 331  * @param hook hook that sould be called by the main window when the time
 332  *             interval changes. This hook function takes a
 333  *             TimeWindowNotifyData* as call_data.
 334  * @param hook_data hook data associated with the hook function. It will
 335  *                  be typically a pointer to the viewer's data structure.
 336  */
 337
 338 void lttvwindow_register_time_window_notify(Tab *tab,
 339                                             LttvHook    hook,
 340                                             gpointer    hook_data);
 341
 342
 343 /**
 344  * Function to unregister the time_window notification hook.
 345  *
 346  * This unregister function is typically called by the destructor of the viewer.
 347  *
 348  * @param tab the tab the viewer belongs to.
 349  * @param hook hook that sould be called by the main window when the time
 350  *             interval changes. This hook function takes a
 351  *             TimeWindowNotifyData* as call_data.
 352  * @param hook_data hook data associated with the hook function. It will
 353  *                  be typically a pointer to the viewer's data structure.
 354  */
 355
 356 void lttvwindow_unregister_time_window_notify(Tab *tab,
 357                                               LttvHook    hook,
 358                                               gpointer    hook_data);
 359
 360
 361 /**
 362  * Function to register a hook function that will be called by the main window
 363  * when the traceset is changed. That means that the viewer must redraw
 364  * itself completely or check if it's affected by the particular change to the
 365  * traceset.
 366  *
 367  * This register function is typically called by the constructor of the viewer.
 368  *
 369  * @param tab the tab the viewer belongs to.
 370  * @param hook hook that should be called whenever a change to the traceset
 371  *             occurs. The call_data of this hook is a NULL pointer.
 372  * @param hook_data hook data associated with the hook function. It will
 373  *                  be typically a pointer to the viewer's data structure.
 374  */
 375
 376 void lttvwindow_register_traceset_notify(Tab *tab,
 377                                          LttvHook    hook,
 378                                          gpointer    hook_data);
 379
 380
 381 /**
 382  * Function to unregister the traceset_notify hook.
 383  *
 384  * @param tab the tab the viewer belongs to.
 385  * @param hook hook that should be called whenever a change to the traceset
 386  *             occurs. The call_data of this hook is a NULL pointer.
 387  * @param hook_data hook data associated with the hook function. It will
 388  *                  be typically a pointer to the viewer's data structure.
 389  */
 390
 391 void lttvwindow_unregister_traceset_notify(Tab *tab,
 392                                            LttvHook    hook,
 393                                            gpointer    hook_data);
 394
 395
 396 /**
 397  * Function to register a hook function for a viewer be completely redrawn.
 398  *
 399  * @param tab viewer's tab
 400  * @param hook hook function of the viewer.
 401  * @param hook_data hook data associated with the hook function.
 402  */
 403
 404 void lttvwindow_register_redraw_notify(Tab *tab,
 405     LttvHook hook, gpointer hook_data);
 406
 407 /**
 408  * Function to unregister a hook function for a viewer be completely redrawn.
 409  *
 410  * @param tab viewer's tab
 411  * @param hook hook function of the viewer.
 412  * @param hook_data hook data associated with the hook function.
 413  */
 414
 415 void lttvwindow_unregister_redraw_notify(Tab *tab,
 416               LttvHook hook, gpointer hook_data);
 417
 418
 419 /**
 420  * Function to register a hook function for a viewer to re-do the events
 421  * requests for the needed interval.
 422  *
 423  * This action is typically done after a "stop".
 424  *
 425  * The typical hook will remove all current requests for the viewer
 426  * and make requests for missing information.
 427  *
 428  * @param tab viewer's tab
 429  * @param hook hook function of the viewer.
 430  * @param hook_data hook data associated with the hook function.
 431  */
 432
 433 void lttvwindow_register_continue_notify(Tab *tab,
 434     LttvHook hook, gpointer hook_data);
 435
 436
 437 /**
 438  * Function to unregister a hook function for a viewer to re-do the events
 439  * requests for the needed interval.
 440  *
 441  * @param tab viewer's tab
 442  * @param hook hook function of the viewer.
 443  * @param hook_data hook data associated with the hook function.
 444  */
 445
 446 void lttvwindow_unregister_continue_notify(Tab *tab,
 447               LttvHook hook, gpointer hook_data);
 448
 449
 450 /**
 451  * Function to register a hook function for a viewer to set/update its
 452  * filter.
 453  *
 454  * FIXME : Add information about what a filter is as seen from a viewer and how
 455  * to use it.
 456  *
 457  * This register function is typically called by the constructor of the viewer.
 458  *
 459  * @param tab the tab the viewer belongs to.
 460  * @param hook hook function called by the main window when a filter change
 461  *             occurs.
 462  * @param hook_data hook data associated with the hook function. It will
 463  *                  be typically a pointer to the viewer's data structure.
 464  */
 465
 466 void lttvwindow_register_filter_notify(Tab *tab,
 467                                        LttvHook    hook,
 468                                        gpointer    hook_data);
 469
 470
 471 /**
 472  * Function to unregister a viewer's hook function which is used to
 473  * set/update the filter of the viewer.
 474  *
 475  * This unregistration is called by the destructor of the viewer.
 476  *
 477  * @param tab the tab the viewer belongs to.
 478  * @param hook hook function called by the main window when a filter change
 479  *             occurs.
 480  * @param hook_data hook data associated with the hook function. It will
 481  *                  be typically a pointer to the viewer's data structure.
 482  */
 483
 484 void lttvwindow_unregister_filter_notify(Tab *tab,
 485                                          LttvHook     hook,
 486                                          gpointer     hook_data);
 487
 488
 489 /**
 490  * Function to register a hook function for a viewer to set/update its
 491  * current time.
 492  *
 493  * @param tab the tab the viewer belongs to.
 494  * @param hook hook function of the viewer that updates the current time. The
 495  *             call_data is a LttTime* representing the new current time.
 496  * @param hook_data hook data associated with the hook function. It will
 497  *                  be typically a pointer to the viewer's data structure.
 498  */
 499
 500 void lttvwindow_register_current_time_notify(Tab *tab,
 501                                              LttvHook    hook,
 502                                              gpointer    hook_data);
 503
 504
 505 /**
 506  * Function to unregister a viewer's hook function which is used to
 507  * set/update the current time of the viewer.
 508  * @param tab the tab the viewer belongs to.
 509  * @param hook hook function of the viewer that updates the current time. The
 510  *             call_data is a LttTime* representing the new current time.
 511  * @param hook_data hook data associated with the hook function. It will
 512  *                  be typically a pointer to the viewer's data structure.
 513  */
 514
 515 void lttvwindow_unregister_current_time_notify(Tab *tab,
 516                                                LttvHook    hook,
 517                                                gpointer    hook_data);
 518
 519
 520 /**
 521  * Function to register a hook function for a viewer to set/update the
 522  * dividor of the hpane. It provides a way to make the horizontal
 523  * dividors of all the viewers linked together.
 524  *
 525  * @param tab the tab the viewer belongs to.
 526  * @param hook hook function of the viewer that will be called whenever a
 527  *             dividor changes in another viewer. The call_data of this hook
 528  *             is a gint*. The value of the integer is the new position of the
 529  *             hpane dividor.
 530  * @param hook_data hook data associated with the hook function. It will
 531  *                  be typically a pointer to the viewer's data structure.
 532  */
 533
 534 void lttvwindow_register_dividor(Tab *tab,
 535                                  LttvHook    hook,
 536                                  gpointer    hook_data);
 537
 538
 539 /**
 540  * Function to unregister a viewer's hook function which is used to
 541  * set/update hpane's dividor of the viewer.
 542  *
 543  * @param tab the tab the viewer belongs to.
 544  * @param hook hook function of the viewer that will be called whenever a
 545  *             dividor changes in another viewer. The call_data of this hook
 546  *             is a gint*. The value of the integer is the new position of the
 547  *             hpane dividor.
 548  * @param hook_data hook data associated with the hook function. It will
 549  *                  be typically a pointer to the viewer's data structure.
 550  */
 551
 552 void lttvwindow_unregister_dividor(Tab *tab,
 553                                    LttvHook    hook,
 554                                    gpointer    hook_data);
 555
 556
 557
 558 /**
 559  * Function to set the time interval of the current tab.a
 560  *
 561  * @param tab the tab the viewer belongs to.
 562  * @param time_interval pointer to the time interval value.
 563  */
 564
 565 void lttvwindow_report_time_window(Tab *tab,
 566                                    const TimeWindow *time_window);
 567
 568 /**
 569  * Function to set the current time/event of the current tab.
 570  * It will be called by a viewer's signal handle associated with
 571  * the button-release-event signal
 572  * @param tab the tab the viewer belongs to.
 573  * @param time a pointer where time is stored.
 574  */
 575
 576 void lttvwindow_report_current_time(Tab *tab,
 577                                     const LttTime *time);
 578
 579
 580 /**
 581  * Function to set the position of the hpane's dividor (viewer).
 582  * It will typically be called by a viewer's signal handle associated
 583  * with the motion_notify_event event/signal.
 584  *
 585  * @param tab the tab the viewer belongs to.
 586  * @param position position of the hpane's dividor.
 587  */
 588
 589 void lttvwindow_report_dividor(Tab *tab, gint position);
 590
 591 /**
 592  * Function to set the focused viewer of the tab.
 593  * It will be called by a viewer's signal handle associated with
 594  * the grab_focus signal of all widgets in the viewer.
 595  *
 596  * @param tab the tab the viewer belongs to.
 597  * @param top_widget the top widget containing all the other widgets of the
 598  *                   viewer.
 599  */
 600 void lttvwindow_report_focus(Tab *tab,
 601                              GtkWidget  *top_widget);
 602
 603
 604 /* Structure sent to the events request hook */
 605                                                 /* Value considered as empty*/
 606 typedef struct _EventsRequest {
 607   gpointer                     owner;           /* Owner of the request     */
 608   gpointer                     viewer_data;     /* Unset : NULL             */
 609   gboolean                     servicing;       /* service in progress: TRUE*/
 610   LttTime                      start_time;      /* Unset : ltt_time_infinite*/
 611   LttvTracesetContextPosition *start_position;  /* Unset : NULL             */
 612   gboolean                     stop_flag;       /* Continue:TRUE Stop:FALSE */
 613   LttTime                      end_time;        /* Unset : ltt_time_infinite*/
 614   guint                        num_events;      /* Unset : G_MAXUINT        */
 615   LttvTracesetContextPosition *end_position;    /* Unset : NULL             */
 616   LttvHooks                   *before_chunk_traceset; /* Unset : NULL       */
 617   LttvHooks                   *before_chunk_trace;    /* Unset : NULL       */
 618   LttvHooks                   *before_chunk_tracefile;/* Unset : NULL       */
 619   LttvHooks                   *event;           /* Unset : NULL             */
 620   LttvHooksById               *event_by_id;     /* Unset : NULL             */
 621   LttvHooks                   *after_chunk_tracefile; /* Unset : NULL       */
 622   LttvHooks                   *after_chunk_trace;     /* Unset : NULL       */
 623   LttvHooks                   *after_chunk_traceset;  /* Unset : NULL       */
 624   LttvHooks                   *before_request;  /* Unset : NULL             */
 625   LttvHooks                   *after_request;   /* Unset : NULL             */
 626 } EventsRequest;
 627
 628 /* Maximum number of events to proceed at once in a chunk */
 629 #define CHUNK_NUM_EVENTS 200
 630
 631
 632 /**
 633  * Function to request data in a specific time interval to the main window. The
 634  * event request servicing is differed until the glib idle functions are
 635  * called.
 636  *
 637  * The viewer has to provide hooks that should be associated with the event
 638  * request.
 639  *
 640  * Either start time or start position must be defined in a EventRequest
 641  * structure for it to be valid.
 642  *
 643  * end_time, end_position and num_events can all be defined. The first one
 644  * to occur will be used as end criterion.
 645  *
 646  * The events_request memory will be managed by the main window once its
 647  * pointer is passed by this function.
 648  *
 649  * @param tab the tab the viewer belongs to.
 650  * @param events_requested Details about the event request.
 651  */
 652
 653 void lttvwindow_events_request(Tab                  *tab,
 654                                EventsRequest  *events_request);
 655
 656 /**
 657  * Function to remove data requests related to a viewer.
 658  *
 659  * The existing requests's viewer gpointer is compared to the pointer
 660  * given in argument to establish which data request should be removed.
 661  *
 662  * @param tab the tab the viewer belongs to.
 663  * @param viewer a pointer to the viewer data structure
 664  */
 665
 666 void lttvwindow_events_request_remove_all(Tab            *tab,
 667                                           gconstpointer   viewer);
 668
 669
 670 /**
 671  * Function to get the current time window of the current tab.
 672  *
 673  * @param tab the tab the viewer belongs to.
 674  * @return the current tab's time interval.
 675  */
 676
 677 TimeWindow lttvwindow_get_time_window(Tab *tab);
 678
 679
 680 /**
 681  * Function to get the current time of the current tab.
 682  *
 683  * @param tab the tab the viewer belongs to.
 684  * @return the current tab's current time.
 685  */
 686
 687 LttTime lttvwindow_get_current_time(Tab *tab);
 688
 689
 690 /**
 691  * Function to get the filter of the current tab.
 692  * @param main_win, the main window the viewer belongs to.
 693  * @param filter, a pointer to a filter.
 694  */
 695
 696 //FIXME
 697 typedef void lttv_filter;
 698 //FIXME
 699 const lttv_filter *lttvwindow_get_filter(Tab *tab);
 700
 701
 702 /**
 703  * Function to get the stats of the traceset
 704  * It must be non const so the viewer can modify it.
 705  * FIXME : a set/get pair of functions would be more appropriate here.
 706  * @param tab the tab the viewer belongs to.
 707  * @return A pointer to Traceset statistics.
 708  */
 709
 710 LttvTracesetStats* lttvwindow_get_traceset_stats(Tab *tab);
 711
 712 /**
 713  * Function to get the context of the traceset
 714  * It must be non const so the viewer can add and remove hooks from it.
 715  * @param tab the tab the viewer belongs to.
 716  * @return Context of the current tab.
 717  */
 718
 719
 720 LttvTracesetContext* lttvwindow_get_traceset_context(Tab *tab);
 721
 722
 723 #endif //VIEWER_H