First step towards a context menu in the profile view

This is completely bogus as all it does is print out the corresponding
time for the spot we right-clicked on the profile. But that at least shows
that the infrastructure is working as intended...

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

3 files changed, 44 insertions, 0 deletions

diff --git a/display.h b/display.h
index c0163aeff..c76afbc02 100644
--- a/display.h
+++ b/display.h
@@ -50,6 +50,7 @@ extern struct divecomputer *select_dc(struct divecomputer *main);
 extern void init_profile_background(struct graphics_context *gc);
 extern void attach_tooltip(int x, int y, int w, int h, const char *text);
 extern void get_plot_details(struct graphics_context *gc, int time, char *buf, size_t bufsize);
+extern int x_to_time(double x);
 
 struct options {
 	enum { PRETTY, TABLE, TWOPERPAGE } type;
diff --git a/gtk-gui.c b/gtk-gui.c
index 8322d3a54..8671115a8 100644
--- a/gtk-gui.c
+++ b/gtk-gui.c
@@ -1959,6 +1959,34 @@ static gboolean scroll_event(GtkWidget *widget, GdkEventScroll *event, gpointer
 	return TRUE;
 }
 
+static void add_gas_change_cb(GtkWidget *menuitem, gpointer data)
+{
+	double *x = data;
+	printf("x = %d:%02u\n", FRACTION(x_to_time(*x), 60));
+}
+
+static void popup_profile_menu(GtkWidget *widget, GdkEventButton *event)
+{
+	GtkWidget *menu, *menuitem, *image;
+	static double x;
+
+	if (!event || !current_dive)
+		return;
+	x = event->x;
+	menu = gtk_menu_new();
+	menuitem = gtk_image_menu_item_new_with_label(_("Add gas change event here"));
+	image = gtk_image_new_from_stock(GTK_STOCK_ADD, GTK_ICON_SIZE_MENU);
+	gtk_image_menu_item_set_image(GTK_IMAGE_MENU_ITEM(menuitem), image);
+	g_signal_connect(menuitem, "activate", G_CALLBACK(add_gas_change_cb), &x);
+	gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);
+
+	gtk_widget_show_all(menu);
+
+	gtk_menu_popup(GTK_MENU(menu), NULL, NULL, NULL, NULL,
+		event->button, gtk_get_current_event_time());
+
+}
+
 static gboolean clicked(GtkWidget *widget, GdkEventButton *event, gpointer user_data)
 {
 	switch (event->button) {
@@ -1967,6 +1995,9 @@ static gboolean clicked(GtkWidget *widget, GdkEventButton *event, gpointer user_
 		zoom_y = event->y;
 		zoom_factor = 2.5;
 		break;
+	case 3:
+		popup_profile_menu(widget, event);
+		break;
 	default:
 		return TRUE;
 	}
diff --git a/profile.c b/profile.c
index 522e5ae15..6bbb11fb1 100644
--- a/profile.c
+++ b/profile.c
@@ -141,6 +141,15 @@ static const color_t profile_color[] = {
 #define SCALEY(gc,y)  (((y)-gc->topy)/(gc->bottomy-gc->topy)*gc->maxy)
 #define SCALE(gc,x,y) SCALEX(gc,x),SCALEY(gc,y)
 
+/* keep the last used gc around so we can invert the SCALEX calculation in
+ * order to calculate a time value for an x coordinate */
+static struct graphics_context last_gc;
+int x_to_time(double x)
+{
+	int seconds = (x - last_gc.drawing_area.x) / last_gc.maxx * (last_gc.rightx - last_gc.leftx) + last_gc.leftx;
+	return (seconds > 0) ? seconds : 0;
+}
+
 static void move_to(struct graphics_context *gc, double x, double y)
 {
 	cairo_move_to(gc->cr, SCALE(gc, x, y));
@@ -700,6 +709,9 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
 
 	gc->leftx = 0; gc->rightx = maxtime;
 	gc->topy = 0; gc->bottomy = 1.0;
+
+	last_gc = *gc;
+
 	set_source_rgba(gc, TIME_GRID);
 	cairo_set_line_width_scaled(gc->cr, 2);