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app: add a "scale_limit" API to GimpSpinScale

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which allows to restrict the scale to a range that is smaller than
that of the model GtkAdjustment. This way we can enter large values in
the entry or by dragging beyond the end of the scale, but keep a
reasonably usable scale range for "normal" values.
This commit is contained in:
Michael Natterer
2011-04-18 21:01:48 +02:00
parent bc56060148
commit d300ec6556
2 changed files with 117 additions and 14 deletions
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115
app/widgets/gimpspinscale.c
View File

@ -50,6 +50,10 @@ typedef struct _GimpSpinScalePrivate GimpSpinScalePrivate;
struct _GimpSpinScalePrivate
{
gchar *label;
gboolean scale_limits_set;
gdouble scale_lower;
gdouble scale_upper;
gboolean changing_value;
gboolean relative_change;
gdouble start_x;
@ -320,6 +324,28 @@ gimp_spin_scale_get_target (GtkWidget *widget,
return TARGET_UPPER;
}
static void
gimp_spin_scale_get_limits (GimpSpinScale *scale,
gdouble *lower,
gdouble *upper)
{
GimpSpinScalePrivate *private = GET_PRIVATE (scale);
if (private->scale_limits_set)
{
*lower = private->scale_lower;
*upper = private->scale_upper;
}
else
{
GtkSpinButton *spin_button = GTK_SPIN_BUTTON (scale);
GtkAdjustment *adjustment = gtk_spin_button_get_adjustment (spin_button);
*lower = gtk_adjustment_get_lower (adjustment);
*upper = gtk_adjustment_get_upper (adjustment);
}
}
static void
gimp_spin_scale_change_value (GtkWidget *widget,
gdouble x)
@ -328,9 +354,13 @@ gimp_spin_scale_change_value (GtkWidget *widget,
GtkSpinButton *spin_button = GTK_SPIN_BUTTON (widget);
GtkAdjustment *adjustment = gtk_spin_button_get_adjustment (spin_button);
GdkWindow *text_window = gtk_entry_get_text_window (GTK_ENTRY (widget));
gdouble lower;
gdouble upper;
gint width;
gdouble value;
gimp_spin_scale_get_limits (GIMP_SPIN_SCALE (widget), &lower, &upper);
width = gdk_window_get_width (text_window);
if (private->relative_change)
@ -338,9 +368,7 @@ gimp_spin_scale_change_value (GtkWidget *widget,
gdouble diff;
gdouble step;
step = ((gtk_adjustment_get_upper (adjustment) -
gtk_adjustment_get_lower (adjustment)) +
gtk_adjustment_get_lower (adjustment)) / width / 10.0;
step = ((upper - lower) + lower) / width / 10.0;
diff = x - private->start_x;
@ -352,9 +380,7 @@ gimp_spin_scale_change_value (GtkWidget *widget,
fraction = x / (gdouble) width;
value = (fraction * (gtk_adjustment_get_upper (adjustment) -
gtk_adjustment_get_lower (adjustment)) +
gtk_adjustment_get_lower (adjustment));
value = fraction * (upper - lower) + lower;
}
gtk_adjustment_set_value (adjustment, value);
@ -476,14 +502,21 @@ static void
gimp_spin_scale_value_changed (GtkSpinButton *spin_button)
{
GtkAdjustment *adjustment = gtk_spin_button_get_adjustment (spin_button);
gdouble lower;
gdouble upper;
gdouble value;
gimp_spin_scale_get_limits (GIMP_SPIN_SCALE (spin_button), &lower, &upper);
value = CLAMP (gtk_adjustment_get_value (adjustment), lower, upper);
gtk_entry_set_progress_fraction (GTK_ENTRY (spin_button),
(gtk_adjustment_get_value (adjustment) -
gtk_adjustment_get_lower (adjustment)) /
(gtk_adjustment_get_upper (adjustment) -
gtk_adjustment_get_lower (adjustment)));
(value - lower) / (upper - lower));
}
/* public functions */
GtkWidget *
gimp_spin_scale_new (GtkAdjustment *adjustment,
const gchar *label,
@ -497,3 +530,65 @@ gimp_spin_scale_new (GtkAdjustment *adjustment,
"digits", digits,
NULL);
}
void
gimp_spin_scale_set_scale_limits (GimpSpinScale *scale,
gdouble lower,
gdouble upper)
{
GimpSpinScalePrivate *private;
GtkSpinButton *spin_button;
GtkAdjustment *adjustment;
g_return_if_fail (GIMP_IS_SPIN_SCALE (scale));
private = GET_PRIVATE (scale);
spin_button = GTK_SPIN_BUTTON (scale);
adjustment = gtk_spin_button_get_adjustment (spin_button);
g_return_if_fail (lower >= gtk_adjustment_get_lower (adjustment));
g_return_if_fail (upper <= gtk_adjustment_get_upper (adjustment));
private->scale_limits_set = TRUE;
private->scale_lower = lower;
private->scale_upper = upper;
gimp_spin_scale_value_changed (spin_button);
}
void
gimp_spin_scale_unset_scale_limits (GimpSpinScale *scale)
{
GimpSpinScalePrivate *private;
g_return_if_fail (GIMP_IS_SPIN_SCALE (scale));
private = GET_PRIVATE (scale);
private->scale_limits_set = FALSE;
private->scale_lower = 0.0;
private->scale_upper = 0.0;
gimp_spin_scale_value_changed (GTK_SPIN_BUTTON (scale));
}
gboolean
gimp_spin_scale_get_scale_limits (GimpSpinScale *scale,
gdouble *lower,
gdouble *upper)
{
GimpSpinScalePrivate *private;
g_return_val_if_fail (GIMP_IS_SPIN_SCALE (scale), FALSE);
private = GET_PRIVATE (scale);
if (lower)
*lower = private->scale_lower;
if (upper)
*upper = private->scale_upper;
return private->scale_limits_set;
}