ac8bf47fa6
In GimpSpinButton, adjust the scroll step in response to modifiers: normal scrolling uses the step increment, Ctrl uses the page increment, and Shift scales the step increment down by the ratio between the page and step increments (up to the minimal precision of the spin button). This applies to all spin buttons used in GIMP, including spin scales.
332 lines
9.1 KiB
C
332 lines
9.1 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpspinbutton.c
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* Copyright (C) 2018 Ell
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*
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* This library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libgimpmath/gimpmath.h"
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#include "gimpwidgetstypes.h"
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#include "gimpspinbutton.h"
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/**
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* SECTION: gimpspinbutton
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* @title: GimpSpinButton
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* @short_description: A #GtkSpinButton with a some tweaked functionality.
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*
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* #GimpSpinButton is a drop-in replacement for #GtkSpinButton, with the
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* following changes:
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*
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* - When the spin-button loses focus, its adjustment value is only
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* updated if the entry text has been changed.
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*
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* - When the spin-button's "wrap" property is TRUE, values input through the
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* entry are wrapped around.
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*
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* - Modifiers can be used during scrolling for smaller/bigger increments.
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**/
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#define MAX_DIGITS 20
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struct _GimpSpinButtonPrivate
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{
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gboolean changed;
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};
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/* local function prototypes */
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static gboolean gimp_spin_button_scroll (GtkWidget *widget,
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GdkEventScroll *event);
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static gboolean gimp_spin_button_focus_in (GtkWidget *widget,
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GdkEventFocus *event);
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static gboolean gimp_spin_button_focus_out (GtkWidget *widget,
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GdkEventFocus *event);
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static gint gimp_spin_button_input (GtkSpinButton *spin_button,
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gdouble *new_value);
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static void gimp_spin_button_changed (GtkEditable *editable,
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gpointer data);
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G_DEFINE_TYPE_WITH_PRIVATE (GimpSpinButton, gimp_spin_button,
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GTK_TYPE_SPIN_BUTTON)
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#define parent_class gimp_spin_button_parent_class
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/* private functions */
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static void
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gimp_spin_button_class_init (GimpSpinButtonClass *klass)
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{
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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GtkSpinButtonClass *spin_button_class = GTK_SPIN_BUTTON_CLASS (klass);
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widget_class->scroll_event = gimp_spin_button_scroll;
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widget_class->focus_in_event = gimp_spin_button_focus_in;
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widget_class->focus_out_event = gimp_spin_button_focus_out;
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spin_button_class->input = gimp_spin_button_input;
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}
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static void
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gimp_spin_button_init (GimpSpinButton *spin_button)
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{
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spin_button->priv = gimp_spin_button_get_instance_private (spin_button);
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g_signal_connect (spin_button, "changed",
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G_CALLBACK (gimp_spin_button_changed),
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NULL);
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}
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static gboolean
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gimp_spin_button_scroll (GtkWidget *widget,
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GdkEventScroll *event)
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{
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if (event->direction == GDK_SCROLL_UP ||
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event->direction == GDK_SCROLL_DOWN)
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{
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GtkSpinButton *spin_button = GTK_SPIN_BUTTON (widget);
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GtkAdjustment *adjustment = gtk_spin_button_get_adjustment (spin_button);
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gdouble step_inc;
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gdouble page_inc;
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gint digits;
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gdouble step;
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step_inc = gtk_adjustment_get_step_increment (adjustment);
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page_inc = gtk_adjustment_get_page_increment (adjustment);
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digits = gtk_spin_button_get_digits (spin_button);
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if (event->state & GDK_SHIFT_MASK)
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{
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step = step_inc * step_inc / page_inc;
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step = MAX (step, pow (10.0, -digits));
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}
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else if (event->state & GDK_CONTROL_MASK)
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{
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step = page_inc;
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}
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else
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{
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step = step_inc;
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}
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if (event->direction == GDK_SCROLL_DOWN)
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step = -step;
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if (! gtk_widget_has_focus (widget))
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gtk_widget_grab_focus (widget);
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gtk_spin_button_spin (spin_button, GTK_SPIN_USER_DEFINED, step);
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return TRUE;
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}
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return GTK_WIDGET_CLASS (parent_class)->scroll_event (widget, event);
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}
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static gboolean
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gimp_spin_button_focus_in (GtkWidget *widget,
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GdkEventFocus *event)
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{
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GimpSpinButton *spin_button = GIMP_SPIN_BUTTON (widget);
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spin_button->priv->changed = FALSE;
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return GTK_WIDGET_CLASS (parent_class)->focus_in_event (widget, event);
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}
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static gboolean
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gimp_spin_button_focus_out (GtkWidget *widget,
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GdkEventFocus *event)
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{
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GimpSpinButton *spin_button = GIMP_SPIN_BUTTON (widget);
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gboolean editable;
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gboolean result;
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editable = gtk_editable_get_editable (GTK_EDITABLE (widget));
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if (! spin_button->priv->changed)
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gtk_editable_set_editable (GTK_EDITABLE (widget), FALSE);
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result = GTK_WIDGET_CLASS (parent_class)->focus_out_event (widget, event);
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if (! spin_button->priv->changed)
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gtk_editable_set_editable (GTK_EDITABLE (widget), editable);
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return result;
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}
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static gint
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gimp_spin_button_input (GtkSpinButton *spin_button,
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gdouble *new_value)
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{
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if (gtk_spin_button_get_wrap (spin_button))
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{
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gdouble value;
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gdouble min;
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gdouble max;
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gchar *endptr;
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value = g_strtod (gtk_entry_get_text (GTK_ENTRY (spin_button)), &endptr);
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if (*endptr)
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return FALSE;
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gtk_spin_button_get_range (spin_button, &min, &max);
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if (min < max)
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{
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gdouble rem;
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rem = fmod (value - min, max - min);
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if (rem < 0.0)
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rem += max - min;
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if (rem == 0.0)
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value = CLAMP (value, min, max);
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else
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value = min + rem;
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}
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else
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{
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value = min;
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}
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*new_value = value;
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return TRUE;
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}
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return FALSE;
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}
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static void
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gimp_spin_button_changed (GtkEditable *editable,
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gpointer data)
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{
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GimpSpinButton *spin_button = GIMP_SPIN_BUTTON (editable);
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spin_button->priv->changed = TRUE;
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}
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/* public functions */
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/**
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* gimp_spin_button_new:
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* @adjustment: (allow-none): the #GtkAdjustment object that this spin
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* button should use, or %NULL
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* @climb_rate: specifies by how much the rate of change in the
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* value will accelerate if you continue to hold
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* down an up/down button or arrow key
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* @digits: the number of decimal places to display
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*
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* Creates a new #GimpSpinButton.
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*
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* Returns: The new spin button as a #GtkWidget
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*
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* Since: 2.10.10
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*/
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GtkWidget *
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gimp_spin_button_new (GtkAdjustment *adjustment,
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gdouble climb_rate,
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guint digits)
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{
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GtkWidget *spin_button;
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g_return_val_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment),
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NULL);
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spin_button = g_object_new (GIMP_TYPE_SPIN_BUTTON, NULL);
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gtk_spin_button_configure (GTK_SPIN_BUTTON (spin_button),
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adjustment, climb_rate, digits);
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return spin_button;
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}
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/**
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* gimp_spin_button_new_with_range:
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* @min: Minimum allowable value
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* @max: Maximum allowable value
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* @step: Increment added or subtracted by spinning the widget
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*
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* This is a convenience constructor that allows creation of a numeric
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* #GimpSpinButton without manually creating an adjustment. The value is
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* initially set to the minimum value and a page increment of 10 * @step
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* is the default. The precision of the spin button is equivalent to the
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* precision of @step.
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*
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* Note that the way in which the precision is derived works best if @step
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* is a power of ten. If the resulting precision is not suitable for your
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* needs, use gtk_spin_button_set_digits() to correct it.
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*
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* Returns: The new spin button as a #GtkWidget
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*
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* Since: 2.10.10
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*/
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GtkWidget *
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gimp_spin_button_new_with_range (gdouble min,
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gdouble max,
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gdouble step)
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{
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GtkAdjustment *adjustment;
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GtkWidget *spin_button;
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gint digits;
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g_return_val_if_fail (min <= max, NULL);
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g_return_val_if_fail (step != 0.0, NULL);
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spin_button = g_object_new (GIMP_TYPE_SPIN_BUTTON, NULL);
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adjustment = gtk_adjustment_new (min, min, max, step, 10.0 * step, 0.0);
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if (fabs (step) >= 1.0 || step == 0.0)
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{
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digits = 0;
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}
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else
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{
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digits = abs ((gint) floor (log10 (fabs (step))));
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if (digits > MAX_DIGITS)
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digits = MAX_DIGITS;
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}
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gtk_spin_button_configure (GTK_SPIN_BUTTON (spin_button),
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adjustment, step, digits);
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gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spin_button), TRUE);
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return spin_button;
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}
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