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spinbutton: Mind the step in the swipe gesture

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The swipe gesture forces values in the spin button that are
"impossible" according to the adjustment. This can break things
in creative ways.

Ensure the steps provided are always multiples of the adjustment
step value, and keep the remainder for further interaction.
This commit is contained in:
Carlos Garnacho 2021-06-08 15:09:37 +02:00
parent 1bf7f5eacb
commit 915388cfdb
1 changed files with 6 additions and 2 deletions
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8
gtk/gtkspinbutton.c
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@ -208,6 +208,7 @@ struct _GtkSpinButton
double climb_rate;
double timer_step;
double swipe_remainder;
int width_chars;
@ -838,6 +839,7 @@ swipe_gesture_begin (GtkGesture *gesture,
{
gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_CLAIMED);
gtk_widget_grab_focus (GTK_WIDGET (spin_button));
spin_button->swipe_remainder = 0;
}
static void
@ -845,10 +847,12 @@ swipe_gesture_update (GtkGesture *gesture,
GdkEventSequence *sequence,
GtkSpinButton *spin_button)
{
double vel_y;
double vel_y, step;
gtk_gesture_swipe_get_velocity (GTK_GESTURE_SWIPE (gesture), NULL, &vel_y);
gtk_spin_button_real_spin (spin_button, -vel_y / 20);
step = (-vel_y / 20) + spin_button->swipe_remainder;
spin_button->swipe_remainder = fmod (step, gtk_adjustment_get_step_increment (spin_button->adjustment));
gtk_spin_button_real_spin (spin_button, step - spin_button->swipe_remainder);
}
static gboolean