Replace event text with small red triangle and tooltip

[ext/subsurface.git] / gtk-gui.c

diff --git a/gtk-gui.c b/gtk-gui.c
index ee3ad2ef11583109f80254007757833970e34fe5..1419e2d69a74a7924bed78d76b86041c80115e6c 100644 (file)
--- a/gtk-gui.c
+++ b/gtk-gui.c
@@ -670,22 +670,75 @@ void run_ui(void)
        gtk_main();
 }
 
+typedef struct {
+       cairo_rectangle_int_t rect;
+       const char *text;
+} tooltip_record_t;
+
+static tooltip_record_t *tooltip_rects;
+static int tooltips;
+
+void attach_tooltip(int x, int y, int w, int h, const char *text)
+{
+       cairo_rectangle_int_t *rect;
+       tooltip_rects = realloc(tooltip_rects, (tooltips + 1) * sizeof(tooltip_record_t));
+       rect = &tooltip_rects[tooltips].rect;
+       rect->x = x;
+       rect->y = y;
+       rect->width = w;
+       rect->height = h;
+       tooltip_rects[tooltips].text = text;
+       tooltips++;
+}
+
+#define INSIDE_RECT(_r,_x,_y)  ((_r.x <= _x) && (_r.x + _r.width >= _x) && \
+                               (_r.y <= _y) && (_r.y + _r.height >= _y))
+
+static gboolean profile_tooltip (GtkWidget *widget, gint x, gint y,
+                       gboolean keyboard_mode, GtkTooltip *tooltip, gpointer user_data)
+{
+       int i;
+       cairo_rectangle_int_t *drawing_area = user_data;
+       gint tx = x - drawing_area->x; /* get transformed coordinates */
+       gint ty = y - drawing_area->y;
+
+       /* are we over an event marker ? */
+       for (i = 0; i < tooltips; i++) {
+               if (INSIDE_RECT(tooltip_rects[i].rect, tx, ty)) {
+                       gtk_tooltip_set_text(tooltip,tooltip_rects[i].text);
+                       return TRUE; /* show tooltip */
+               }
+       }
+       return FALSE; /* don't show tooltip */
+}
+
 static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
 {
        struct dive *dive = current_dive;
        struct graphics_context gc = { .printer = 0 };
-       int w,h;
+       static cairo_rectangle_int_t drawing_area;
 
-       w = widget->allocation.width;
-       h = widget->allocation.height;
+       /* the drawing area gives TOTAL width * height - x,y is used as the topx/topy offset
+        * so effective drawing area is width-2x * height-2y */
+       drawing_area.width = widget->allocation.width;
+       drawing_area.height = widget->allocation.height;
+       drawing_area.x = drawing_area.width / 20.0;
+       drawing_area.y = drawing_area.height / 20.0;
 
        gc.cr = gdk_cairo_create(widget->window);
+       g_object_set(widget, "has-tooltip", TRUE, NULL);
+       g_signal_connect(widget, "query-tooltip", G_CALLBACK(profile_tooltip), &drawing_area);
        set_source_rgb(&gc, 0, 0, 0);
        cairo_paint(gc.cr);
 
-       if (dive)
-               plot(&gc, w, h, dive);
-
+       if (dive) {
+               if (tooltip_rects) {
+                       free(tooltip_rects);
+                       tooltip_rects = NULL;
+               }
+               tooltips = 0;
+               plot(&gc, &drawing_area, dive);
+       }
        cairo_destroy(gc.cr);
 
        return FALSE;