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scrolled window: Use shift to modify scroll direction

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It has been a long-standing request to interpret scroll events
with Shift held down as horizontal instead of vertical, and
some applications are already doing this on their own.

https://bugzilla.gnome.org/show_bug.cgi?id=132197
This commit is contained in:
Matthias Clasen 2015-03-17 08:54:45 -04:00
parent 00544e9090
commit d823c39caf
1 changed files with 17 additions and 3 deletions
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20
gtk/gtkscrolledwindow.c
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@ -2908,7 +2908,10 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
gboolean handled = FALSE;
gdouble delta_x;
gdouble delta_y;
gdouble delta;
GdkScrollDirection direction;
gboolean shifted;
shifted = (event->state & GDK_SHIFT_MASK) != 0;
scrolled_window = GTK_SCROLLED_WINDOW (widget);
priv = scrolled_window->priv;
@ -2917,6 +2920,15 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y))
{
if (shifted)
{
gdouble delta;
delta = delta_x;
delta_x = delta_y;
delta_y = delta;
}
if (delta_x != 0.0 &&
may_hscroll (scrolled_window))
{
@ -2963,12 +2975,13 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
handled = TRUE;
}
}
else
else if (gdk_event_get_scroll_direction ((GdkEvent *)event, &direction))
{
GtkWidget *range;
gboolean may_scroll;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
if ((!shifted && (direction == GDK_SCROLL_UP || direction == GDK_SCROLL_DOWN)) ||
(shifted && (direction == GDK_SCROLL_LEFT || direction == GDK_SCROLL_RIGHT)))
{
range = priv->vscrollbar;
may_scroll = may_vscroll (scrolled_window);
@ -2983,6 +2996,7 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
{
GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
gdouble new_value;
gdouble delta;
delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event);