[gtkmm3] emettre un signal.

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24/09/2015, 09h57
Luke spywoker

[gtkmm3] emettre un signal.

Salut les GTK,

j'y suis presque car j'essaie d'exécuter une fonction quand ont appuis sur une touche,

ma technique marche mais il faudrait que je pense puisse émettre un signal dont le callback rafraîchis l'écran.

Je sais que c'est possible avec un signal personnalisée et la fonction emit().

Mais je n'arrive pas a émettre un signal qui ne soit pas personnel.

Merci pour vos réponses.
24/09/2015, 19h17
gerald3d

On pourrait voir le callback qui doit être exécuté lors de l'émission. Et en même temps quel signal veux-tu émettre ?
25/09/2015, 15h25
Luke spywoker

Salut gérald3d,

il est vrai que le message est un peu confus et manque d'informations mais je ne peut pas te donner le code maintenant (trop long pas sous la mains):

Je peut préciser que je veut émettre un signal de type signal_motion_notify_event: le signal qui est émis quand on bouge la souris au dessus de mon display (un widget Gtk::Layout) car je doit mettre a jours une image,

ce qui est fait dans le callback du signal signal_motion_notify_event.

Et donc j'aimerai pouvoir modifier l'image avec les touches flèchées et donc
il faut, en partie, que j'émette ce signal car si la souris ne bouge pas le signal n'est pas émis et donc pas de changement d'image.

Et je pense que ma technique pour implémenter la manipulation du clavier n'est pas au point car j'ai beau appuyer sur la touche plusieurs fois.
Le callback d'appuie de la touche n'est exécuter qu'une fois au lieu de plusieurs fois (je crois que j'utilise le signal_key_press du Gtk::Layout si je me souvient bien).

Je ne sais si c'est en rapport avec les mouvement de la souris que le callback n'est exécuter qu'une fois ?

Merci pour vos réponses éclairées.
04/10/2015, 09h06
Luke spywoker

AAAAAAAArgs,

j'arrive pas a trouver la fonction analogue a g_signal_emit() dans la glibmm.

C'est la doc, je préfère celle du C concernant Gtk+3 et co car ya un index et j'ai pas trouver dans la doxygen de la glibmm.
05/10/2015, 16h49
gerald3d

Citation:

Envoyé par Luke spywoker

AAAAAAAArgs,

j'arrive pas a trouver la fonction analogue a g_signal_emit() dans la glibmm.

C'est la doc, je préfère celle du C concernant Gtk+3 et co car ya un index et j'ai pas trouver dans la doxygen de la glibmm.

À force de recherche je crois que j'ai trouvé ton bonheur : bool Gtk::Widget::event (GdkEvent*event);

Salut gérald3d,

je suis de retours de vacances et du coup la réponse tardive:

Est tu sur que l'on peut émettre un "signal" avec:
Code:

1 2 bool Gtk::Widget::event (GdkEvent*event);
Pas plutot un GdkEvent justement, ce que je pense différents, sans vouloir t'offenser ?

Car quand je cherche un GdkEvent dans la doc je tombe sur des Events du type:

GDK_NOTHING a special code to indicate a null event.

GDK_DELETE the window manager has requested that the toplevel window be hidden or destroyed, usually when the user clicks on a special icon in the title bar.

GDK_DESTROY the window has been destroyed.

GDK_EXPOSE all or part of the window has become visible and needs to be redrawn.

GDK_MOTION_NOTIFY the pointer (usually a mouse) has moved.

GDK_BUTTON_PRESS a mouse button has been pressed.

GDK_2BUTTON_PRESS a mouse button has been double-clicked (clicked twice within a short period of time). Note that each click also generates aGDK_BUTTON_PRESS event.

GDK_DOUBLE_BUTTON_PRESS alias for GDK_2BUTTON_PRESS, added in 3.6.

GDK_3BUTTON_PRESS a mouse button has been clicked 3 times in a short period of time. Note that each click also generates a GDK_BUTTON_PRESS event.

GDK_TRIPLE_BUTTON_PRESS alias for GDK_3BUTTON_PRESS, added in 3.6.

GDK_BUTTON_RELEASE a mouse button has been released.

GDK_KEY_PRESS a key has been pressed.

GDK_KEY_RELEASE a key has been released.

GDK_ENTER_NOTIFY the pointer has entered the window.

GDK_LEAVE_NOTIFY the pointer has left the window.

GDK_FOCUS_CHANGE the keyboard focus has entered or left the window.

GDK_CONFIGURE the size, position or stacking order of the window has changed. Note that GTK+ discards these events for GDK_WINDOW_CHILD windows.

GDK_MAP the window has been mapped.

GDK_UNMAP the window has been unmapped.

GDK_PROPERTY_NOTIFY a property on the window has been changed or deleted.

GDK_SELECTION_CLEAR the application has lost ownership of a selection.

GDK_SELECTION_REQUEST another application has requested a selection.

GDK_SELECTION_NOTIFY a selection has been received.

GDK_PROXIMITY_IN an input device has moved into contact with a sensing surface (e.g. a touchscreen or graphics tablet).

GDK_PROXIMITY_OUT an input device has moved out of contact with a sensing surface.

GDK_DRAG_ENTER the mouse has entered the window while a drag is in progress.

GDK_DRAG_LEAVE the mouse has left the window while a drag is in progress.

GDK_DRAG_MOTION the mouse has moved in the window while a drag is in progress.

GDK_DRAG_STATUS the status of the drag operation initiated by the window has changed.

GDK_DROP_START a drop operation onto the window has started.

GDK_DROP_FINISHED the drop operation initiated by the window has completed.

GDK_CLIENT_EVENT a message has been received from another application.

GDK_VISIBILITY_NOTIFY the window visibility status has changed.

GDK_SCROLL the scroll wheel was turned

GDK_WINDOW_STATE the state of a window has changed. See GdkWindowState for the possible window states

GDK_SETTING a setting has been modified.

GDK_OWNER_CHANGE the owner of a selection has changed. This event type was added in 2.6

GDK_GRAB_BROKEN a pointer or keyboard grab was broken. This event type was added in 2.8.

GDK_DAMAGE the content of the window has been changed. This event type was added in 2.14.

GDK_TOUCH_BEGIN A new touch event sequence has just started. This event type was added in 3.4.

GDK_TOUCH_UPDATE A touch event sequence has been updated. This event type was added in 3.4.

GDK_TOUCH_END A touch event sequence has finished. This event type was added in 3.4.

GDK_TOUCH_CANCEL A touch event sequence has been canceled. This event type was added in 3.4.

GDK_EVENT_LAST marks the end of the GdkEventType enumeration. Added in 2.18

Ou me serai-je tromper ?

Il serai plus simple de trouver le pendant de g_signal_emit(...) dans la glibmm.

Mais bon, cette doc est mal foutue je trouve.

A+ Luke spywoker.

Je ne comprend pas bien ton histoire de signal.

Pour moi la notion de signal est liée à celle de widget: quand tu crée un nouveau widget, tu peux lui associer de nouveaux signaux pour exploiter les callbacks associés à ce nouveau widget et tu mets en branle tout un mécanisme propre à GTK.

Si il s'agit seulement de déclencher l'exécution d'une fonction donnée en détectant un évènement particulier (appui sur une touche, mouvement de la souris,...) il suffit fabriquer un "event handler".
Par exemple dans GraceGTK (c'est du GTK2 en C, mais je pense que tu peux transposer facilement en gtkmm), j'ai une GtkDrawingArea appelée w_canvas que je connecte à mon event handler:
Code:

1 2 3 4 5 6 7 8 9 10 gtk_widget_add_events (w_canvas , GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK | GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK ); g_signal_connect (w_canvas ,"key-press-event" ,G_CALLBACK (ev_handler) ,NULL); g_signal_connect (w_canvas ,"key-release-event" ,G_CALLBACK (ev_handler) ,NULL);
et:
Code:

1 2 3 4 5 6 7 8 9 10 11 12 void ev_handler (GtkWidget *widget ,GdkEvent *event ,gpointer data) { ... switch (event->type) { case GDK_KEY_PRESS: switch (event->key.keyval) { case GDK_Shift_L: case GDK_Shift_R: Shift_pressed = GDK_Shift_L; break; case GDK_KEY_RELEASE: ...
et c'est ev_handler() qui appelle la fonction de mon choix.

Je pense que c'est ce que gerald3 suggérait de faire en te signalant Gtk::Widget::event (GdkEvent*event);

GDK_NOTHING	a special code to indicate a null event.
GDK_DELETE	the window manager has requested that the toplevel window be hidden or destroyed, usually when the user clicks on a special icon in the title bar.
GDK_DESTROY	the window has been destroyed.
GDK_EXPOSE	all or part of the window has become visible and needs to be redrawn.
GDK_MOTION_NOTIFY	the pointer (usually a mouse) has moved.
GDK_BUTTON_PRESS	a mouse button has been pressed.
GDK_2BUTTON_PRESS	a mouse button has been double-clicked (clicked twice within a short period of time). Note that each click also generates aGDK_BUTTON_PRESS event.
GDK_DOUBLE_BUTTON_PRESS	alias for GDK_2BUTTON_PRESS, added in 3.6.
GDK_3BUTTON_PRESS	a mouse button has been clicked 3 times in a short period of time. Note that each click also generates a GDK_BUTTON_PRESS event.
GDK_TRIPLE_BUTTON_PRESS	alias for GDK_3BUTTON_PRESS, added in 3.6.
GDK_BUTTON_RELEASE	a mouse button has been released.
GDK_KEY_PRESS	a key has been pressed.
GDK_KEY_RELEASE	a key has been released.
GDK_ENTER_NOTIFY	the pointer has entered the window.
GDK_LEAVE_NOTIFY	the pointer has left the window.
GDK_FOCUS_CHANGE	the keyboard focus has entered or left the window.
GDK_CONFIGURE	the size, position or stacking order of the window has changed. Note that GTK+ discards these events for GDK_WINDOW_CHILD windows.
GDK_MAP	the window has been mapped.
GDK_UNMAP	the window has been unmapped.
GDK_PROPERTY_NOTIFY	a property on the window has been changed or deleted.
GDK_SELECTION_CLEAR	the application has lost ownership of a selection.
GDK_SELECTION_REQUEST	another application has requested a selection.
GDK_SELECTION_NOTIFY	a selection has been received.
GDK_PROXIMITY_IN	an input device has moved into contact with a sensing surface (e.g. a touchscreen or graphics tablet).
GDK_PROXIMITY_OUT	an input device has moved out of contact with a sensing surface.
GDK_DRAG_ENTER	the mouse has entered the window while a drag is in progress.
GDK_DRAG_LEAVE	the mouse has left the window while a drag is in progress.
GDK_DRAG_MOTION	the mouse has moved in the window while a drag is in progress.
GDK_DRAG_STATUS	the status of the drag operation initiated by the window has changed.
GDK_DROP_START	a drop operation onto the window has started.
GDK_DROP_FINISHED	the drop operation initiated by the window has completed.
GDK_CLIENT_EVENT	a message has been received from another application.
GDK_VISIBILITY_NOTIFY	the window visibility status has changed.
GDK_SCROLL	the scroll wheel was turned
GDK_WINDOW_STATE	the state of a window has changed. See GdkWindowState for the possible window states
GDK_SETTING	a setting has been modified.
GDK_OWNER_CHANGE	the owner of a selection has changed. This event type was added in 2.6
GDK_GRAB_BROKEN	a pointer or keyboard grab was broken. This event type was added in 2.8.
GDK_DAMAGE	the content of the window has been changed. This event type was added in 2.14.
GDK_TOUCH_BEGIN	A new touch event sequence has just started. This event type was added in 3.4.
GDK_TOUCH_UPDATE	A touch event sequence has been updated. This event type was added in 3.4.
GDK_TOUCH_END	A touch event sequence has finished. This event type was added in 3.4.
GDK_TOUCH_CANCEL	A touch event sequence has been canceled. This event type was added in 3.4.
GDK_EVENT_LAST	marks the end of the GdkEventType enumeration. Added in 2.18