[gedit] gedit-print-preview: fix tooltips apparition

[Sebastien Lafargue <slafargue src gnome org>]

commit 37885e430a4df39a19aebd07cb5b2a96c8b8e2b7
Author: Ankita Patil <patil ankita r gmail com>
Date:   Wed Sep 10 14:03:37 2014 +0200

    gedit-print-preview: fix tooltips apparition
    
    We Hide the tooltip when we move the cursor and
    move it only on a 20 pixels theshold.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=540330

 gedit/gedit-print-preview.c |   73 ++++++++++++++++++++++++++++++++++++++----
 1 files changed, 66 insertions(+), 7 deletions(-)
---
diff --git a/gedit/gedit-print-preview.c b/gedit/gedit-print-preview.c
index 49ec6a1..8b8e84b 100644
--- a/gedit/gedit-print-preview.c
+++ b/gedit/gedit-print-preview.c
@@ -32,6 +32,7 @@
 #include "gedit-print-preview.h"
 
 #define PRINTER_DPI (72.)
+#define TOOLTIP_THRESHOLD 20
 
 struct _GeditPrintPreviewPrivate
 {
@@ -70,6 +71,11 @@ struct _GeditPrintPreviewPrivate
 
        guint n_pages;
        guint cur_page;
+       gint cursor_x;
+       gint cursor_y;
+
+       gboolean has_tooltip;
+
 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (GeditPrintPreview, gedit_print_preview, GTK_TYPE_GRID)
@@ -587,6 +593,39 @@ get_page_at_coords (GeditPrintPreview *preview,
 }
 
 static gboolean
+on_preview_layout_motion_notify (GtkWidget         *widget,
+                                 GdkEvent          *event,
+                                 GeditPrintPreview *preview)
+{
+       GeditPrintPreviewPrivate *priv;
+       gint temp_x;
+       gint temp_y;
+       gint diff_x;
+       gint diff_y;
+       priv = preview->priv;
+
+       temp_x = ((GdkEventMotion*)event)->x;
+       temp_y = ((GdkEventMotion*)event)->y;
+       diff_x = abs (temp_x - priv->cursor_x);
+       diff_y = abs (temp_y - priv->cursor_y);
+
+       if ((diff_x >= TOOLTIP_THRESHOLD) || (diff_y >= TOOLTIP_THRESHOLD))
+
+       {
+               priv->has_tooltip = FALSE;
+               priv->cursor_x = temp_x;
+               priv->cursor_y = temp_y;
+       }
+       else
+       {
+               priv->has_tooltip = TRUE;
+
+       }
+
+       return GDK_EVENT_STOP;
+}
+
+static gboolean
 preview_layout_query_tooltip (GtkWidget         *widget,
                              gint               x,
                              gint               y,
@@ -594,18 +633,30 @@ preview_layout_query_tooltip (GtkWidget         *widget,
                              GtkTooltip        *tooltip,
                              GeditPrintPreview *preview)
 {
+       GeditPrintPreviewPrivate *priv;
        gint pg;
        gchar *tip;
 
-       pg = get_page_at_coords (preview, x, y);
-       if (pg < 0)
-               return FALSE;
+       priv = preview->priv;
+
+       if (priv->has_tooltip == TRUE)
+       {
+               pg = get_page_at_coords (preview, x, y);
+               if (pg < 0)
+                       return FALSE;
 
-       tip = g_strdup_printf (_("Page %d of %d"), pg + 1, preview->priv->n_pages);
-       gtk_tooltip_set_text (tooltip, tip);
-       g_free (tip);
+               tip = g_strdup_printf (_("Page %d of %d"), pg + 1, preview->priv->n_pages);
+               gtk_tooltip_set_text (tooltip, tip);
+               g_free (tip);
+
+               return TRUE;
+       }
+       else
+       {
+               priv->has_tooltip = TRUE;
+               return FALSE;
+       }
 
-       return TRUE;
 }
 
 static gint
@@ -842,6 +893,11 @@ gedit_print_preview_init (GeditPrintPreview *preview)
                          G_CALLBACK (preview_layout_key_press),
                          preview);
 
+       /* hide the tooltip once we move the cursor, since gtk does not do it for us */
+       g_signal_connect (priv->layout,
+                         "motion-notify-event",
+                         G_CALLBACK (on_preview_layout_motion_notify),
+                         preview);
        gtk_widget_grab_focus (GTK_WIDGET (priv->layout));
 
        /* FIXME */
@@ -852,6 +908,9 @@ gedit_print_preview_init (GeditPrintPreview *preview)
        priv->scale = 1.0;
        priv->rows = 1;
        priv->cols = 1;
+       priv->cursor_x = 0;
+       priv->cursor_y = 0;
+       priv->has_tooltip = TRUE;
 }
 
 static void