Re: mouse wheel

[Owen Taylor <otaylor redhat com>]

David Monniaux <David Monniaux ens fr> writes:

> Hi,
> 
> currently (1.2.x) the mouse wheel behavior is hardcoded in gtkmain.c. It
> is understood that buttons 4 and 5 are impulsions for vertical scrolling
> of widgets. It is understood that the user has put "ZAxisMapping 4 5" into
> XF86Config if running XFree86.
> 
> Some new mice have two wheels; the second one is intended for horizontal
> scrolling. Of course, it's possible to add support for it in a similar
> fashion (I may soon send a patch for this).
> 
> However, I find it a bit rigid and hackish that button numbers should be
> hardwired on behaviors. Some mice have more than 3 physical buttons and
> the user might want buttons 4 and 5 not to behave like a wheel.
> 
> Are there any plans to make wheel behavior customizable; i.e. allow, say,
> buttons 6-7 for vertical scrolling and 8-9 for horiz?

>From the development branch:

typedef enum
{
  GDK_SCROLL_UP,
  GDK_SCROLL_DOWN,
  GDK_SCROLL_LEFT,
  GDK_SCROLL_RIGHT
} GdkScrollDirection;

struct _GdkEventScroll
{
  GdkEventType type;
  GdkWindow *window;
  gint8 send_event;
  guint32 time;
  gdouble x;
  gdouble y;
  guint state;
  GdkScrollDirection direction;
  GdkDevice *device;
  gdouble x_root, y_root;
};

Making the exact mechanism for generating scroll events customizable
should be easy, though it isn't currently.

Regards,
                                        Owen