[grits] Add motion threshold when clicking objects

[Andy Spencer <andys src gnome org>]

commit d55c77bbf477e582a8525ac831ad97b035b8185d
Author: Andy Spencer <andy753421 gmail com>
Date:   Wed Jan 23 06:46:16 2013 +0000

    Add motion threshold when clicking objects
    
    This allows a click to go though even if a small amount of mouse motion
    is detected. Currently set to 8 motion events, it might be better to use
    pixels instead of events.

 src/objects/grits-object.c |    8 +++++---
 src/objects/grits-object.h |    5 ++++-
 2 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/src/objects/grits-object.c b/src/objects/grits-object.c
index 2eb6b5c..2812b9e 100644
--- a/src/objects/grits-object.c
+++ b/src/objects/grits-object.c
@@ -211,11 +211,13 @@ gboolean grits_object_event(GritsObject *object, GdkEvent *event)
 
 	/* Handle button click */
 	if (sig == SIG_BUTTON_PRESS)
-		object->state.clicking = TRUE;
+		object->state.clicking  = GRITS_CLICK_THRESHOLD;
+	if (sig == SIG_MOTION && object->state.clicking)
+		object->state.clicking -= 1;
 	if (sig == SIG_BUTTON_RELEASE && object->state.clicking)
 		g_signal_emit(object, signals[SIG_CLICKED], 0, event, &rval);
-	if (sig == SIG_BUTTON_RELEASE || sig == SIG_MOTION)
-		object->state.clicking = FALSE;
+	if (sig == SIG_BUTTON_RELEASE)
+		object->state.clicking  = 0;
 
 	/* Emit this signal */
 	if (rval == FALSE) {
diff --git a/src/objects/grits-object.h b/src/objects/grits-object.h
index 9969278..728ac72 100644
--- a/src/objects/grits-object.h
+++ b/src/objects/grits-object.h
@@ -36,11 +36,14 @@
 #define GRITS_SKIP_CENTER  (1<<2)
 #define GRITS_SKIP_STATE   (1<<3)
 
+/* Mouse move threshold for clicking */
+#define GRITS_CLICK_THRESHOLD 8
+
 /* Picking states */
 typedef struct {
 	guint picked   : 1;
 	guint selected : 1;
-	guint clicking : 1;
+	guint clicking : 6;
 } GritsState;
 
 typedef struct _GritsObject      GritsObject;