WIP: WIP: How to associate an action to this button ?

src/ui/application.c

@@ -148,3 +148,49 @@ GemGraphClientApplication *gem_graph_client_application_new(
                        "flags", flags,
                        NULL);
 }
+
+/* button-event.c
+ *
+ * Compile: cc -ggdb button-event.c -o button-event $(pkg-config --cflags --libs gtk4)
+ * Run: ./button-event
+ *
+ * Author: Mohammed Sadiq <www.sadiqpk.org>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later OR CC0-1.0
+ */
+
+#include <gtk/gtk.h>
+
+static gboolean
+gesture_released_cb (GtkWidget *widget)
+{
+    g_warning ("do something");
+
+    return GDK_EVENT_STOP;
+}
+
+static void
+app_activated_cb (GtkApplication *app)
+{
+    GtkGesture *gesture;
+    GtkWindow *window;
+    GtkWidget *box, *label;
+
+    window = GTK_WINDOW (gtk_application_window_new (app));
+    gtk_window_set_default_size (window, 400, 300);
+
+    box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+    label = gtk_label_new ("Hello");
+    gtk_box_append (GTK_BOX (box), label);
+    gtk_window_set_child (window, box);
+
+    gesture = gtk_gesture_click_new ();
+
+    g_signal_connect_object (gesture, "released",
+                           G_CALLBACK (gesture_released_cb),
+                           box, G_CONNECT_SWAPPED);
+    gtk_widget_add_controller (label, GTK_EVENT_CONTROLLER (gesture));
+
+    gtk_window_present (window);
+}
+

src/ui/tree.c

@@ -184,6 +184,11 @@ A button is now in the  GtkBox *runlib_objects of windows.c (line 61)\n\
 }
 
 /*
+https://docs.gtk.org/gtk4/input-handling.html
+
+https://stackoverflow.com/questions/76583553/how-to-use-eventcontroller-in-gtk4
+https://docs.gtk.org/gobject/func.signal_connect_object.html
+
 https://docs.gtk.org/gobject/#functions
 https://docs.gtk.org/gtk4/class.Label.html?q=
 https://docs.gtk.org/gtk4/ctor.Button.new_with_label.html

src/ui/window.c

@@ -243,8 +243,21 @@ GtkWidget *create_tree_label(void)
     return label;
 }
 
+#include <gtk/gtk.h>
+
+static gboolean
+gesture_released_cb (GtkWidget *widget)
+{
+    g_warning ("do something");
+
+    printf("Hello !  I'm the button  <>  I've been clicked !!!\n");
+
+    return GDK_EVENT_STOP;
+}
+
 GtkWidget *create_tree_button(void)
 {
+    GtkGesture *gesture;
     GtkWidget *button;
     const char *text = "Hello !  I'm the button";
 
@@ -252,6 +265,19 @@ GtkWidget *create_tree_button(void)
     gtk_box_append(GTK_BOX(window->runlib_objects), button);
     gtk_widget_show(button);
 
+    gesture = gtk_gesture_click_new ();
+    GdkDevice *xxx = gtk_gesture_get_device (gesture);     // printf("%s\n", xxx.class.name);
+
+    if (gesture) printf("Hello !  I'm the button  <>  I'm being clicked !!!  \n");
+    //GtkGestureClick::pressed
+
+    g_signal_connect_object (gesture, "released",
+                           G_CALLBACK (gesture_released_cb),
+                           GTK_BOX(window->runlib_objects), G_CONNECT_SWAPPED);
+    //Use G_CALLBACK() to cast the callback function to a GCallback.
+
+    gtk_widget_add_controller (button, GTK_EVENT_CONTROLLER (gesture));
+
     tree_c_test();
 
     return button;