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When repeatedly clicking on a stack of items to cycle through the stack, a

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click on an anchor point of the selected object would be treated as a drag, 
even if the click was very short. This created a very confusing user 
experience.

- gui_canvas.c (button_release_event): if we didn't "escape" the drag radius,
  don't treat the click as a drag but run the click-to-select process instead
  (note: the drag visualization still flickers briefly)
- gui_canvas.c (button_release_event): to find out if we've escaped the drag
  radius, just call drag_left instead of duplicating some of its code



git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5772 99fdad57-331a-0410-800a-d7fa5415bdb3
This commit is contained in:
werner 2010-01-02 22:04:25 +00:00
parent 522e8df574
commit f9eefa4e69
1 changed files with 25 additions and 12 deletions
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37
gui_canvas.c
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@ -40,8 +40,11 @@ static struct coord curr_pos; /* canvas coordinates ! */
static struct coord user_origin = { 0, 0 };
static int dragging = 0;
static int drag_escaped = 0; /* 1 once we've made is out of the drag radius */
static int drag_escaped = 0; /* 1 once we've made it out of the drag radius */
static struct coord drag_start;
static struct inst *selected_before_drag;
/* instance selected before dragging. we use it to do the click-to-select
routine in case we later find out the drag was really just a click. */
/* ----- status display ---------------------------------------------------- */
@ -183,11 +186,22 @@ static gboolean motion_notify_event(GtkWidget *widget, GdkEventMotion *event,
/* ----- button press and release ------------------------------------------ */
static void click_to_select(struct coord pos)
{
const struct inst *prev;
tool_reset();
prev = selected_inst;
inst_select(pos);
if (prev != selected_inst)
redraw();
}
static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event,
gpointer data)
{
struct coord pos = canvas_to_coord(event->x, event->y);
const struct inst *prev;
int res;
DPRINTF("--- button press ---");
@ -207,6 +221,7 @@ static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event,
break;
}
if (res) {
selected_before_drag = selected_inst;
inst_deselect();
redraw();
dragging = 1;
@ -214,11 +229,7 @@ static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event,
drag_start = pos;
break;
}
tool_reset();
prev = selected_inst;
inst_select(pos);
if (prev != selected_inst)
redraw();
click_to_select(pos);
break;
case 2:
tool_dehover();
@ -241,14 +252,16 @@ static gboolean button_release_event(GtkWidget *widget, GdkEventButton *event,
case 1:
if (!dragging)
break;
drag_left(pos);
dragging = 0;
if (hypot(pos.x-drag_start.x,
pos.y-drag_start.y)/draw_ctx.scale < DRAG_MIN_R)
if (!drag_escaped) {
tool_cancel_drag();
else {
if (tool_end_drag(pos))
change_world();
selected_inst = selected_before_drag;
click_to_select(pos);
break;
}
if (tool_end_drag(pos))
change_world();
break;
}
return TRUE;