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gtk2/gtk/gtkscale.c
Matthias Clasen 113f364a37 More of the same
2006-05-14 04:25:34 +00:00

724 lines
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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
* Copyright (C) 2001 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <config.h>
#include <math.h>
#include "gtkintl.h"
#include "gtkscale.h"
#include "gtkmarshalers.h"
#include "gdk/gdkkeysyms.h"
#include "gtkbindings.h"
#include "gtkprivate.h"
#include "gtkalias.h"
#define MAX_DIGITS (64) /* don't change this,
* a) you don't need to and
* b) you might cause buffer owerflows in
* unrelated code portions otherwise
*/
#define GTK_SCALE_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_SCALE, GtkScalePrivate))
typedef struct _GtkScalePrivate GtkScalePrivate;
struct _GtkScalePrivate
{
PangoLayout *layout;
};
enum {
PROP_0,
PROP_DIGITS,
PROP_DRAW_VALUE,
PROP_VALUE_POS
};
enum {
FORMAT_VALUE,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];
static void gtk_scale_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_scale_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_scale_style_set (GtkWidget *widget,
GtkStyle *previous);
static void gtk_scale_get_range_border (GtkRange *range,
GtkBorder *border);
static void gtk_scale_finalize (GObject *object);
static void gtk_scale_screen_changed (GtkWidget *widget,
GdkScreen *old_screen);
G_DEFINE_ABSTRACT_TYPE (GtkScale, gtk_scale, GTK_TYPE_RANGE)
static gboolean
single_string_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy)
{
gboolean continue_emission;
const gchar *str;
str = g_value_get_string (handler_return);
g_value_set_string (return_accu, str);
continue_emission = str == NULL;
return continue_emission;
}
#define add_slider_binding(binding_set, keyval, mask, scroll) \
gtk_binding_entry_add_signal (binding_set, keyval, mask, \
I_("move_slider"), 1, \
GTK_TYPE_SCROLL_TYPE, scroll)
static void
gtk_scale_class_init (GtkScaleClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkRangeClass *range_class;
GtkBindingSet *binding_set;
gobject_class = G_OBJECT_CLASS (class);
range_class = (GtkRangeClass*) class;
widget_class = (GtkWidgetClass*) class;
gobject_class->set_property = gtk_scale_set_property;
gobject_class->get_property = gtk_scale_get_property;
gobject_class->finalize = gtk_scale_finalize;
widget_class->style_set = gtk_scale_style_set;
widget_class->screen_changed = gtk_scale_screen_changed;
range_class->get_range_border = gtk_scale_get_range_border;
signals[FORMAT_VALUE] =
g_signal_new (I_("format_value"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkScaleClass, format_value),
single_string_accumulator, NULL,
_gtk_marshal_STRING__DOUBLE,
G_TYPE_STRING, 1,
G_TYPE_DOUBLE);
g_object_class_install_property (gobject_class,
PROP_DIGITS,
g_param_spec_int ("digits",
P_("Digits"),
P_("The number of decimal places that are displayed in the value"),
-1,
MAX_DIGITS,
1,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_DRAW_VALUE,
g_param_spec_boolean ("draw-value",
P_("Draw Value"),
P_("Whether the current value is displayed as a string next to the slider"),
TRUE,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_VALUE_POS,
g_param_spec_enum ("value-pos",
P_("Value Position"),
P_("The position in which the current value is displayed"),
GTK_TYPE_POSITION_TYPE,
GTK_POS_TOP,
GTK_PARAM_READWRITE));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("slider-length",
P_("Slider Length"),
P_("Length of scale's slider"),
0,
G_MAXINT,
31,
GTK_PARAM_READABLE));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("value-spacing",
P_("Value spacing"),
P_("Space between value text and the slider/trough area"),
0,
G_MAXINT,
2,
GTK_PARAM_READABLE));
/* All bindings (even arrow keys) are on both h/v scale, because
* blind users etc. don't care about scale orientation.
*/
binding_set = gtk_binding_set_by_class (class);
add_slider_binding (binding_set, GDK_Left, 0,
GTK_SCROLL_STEP_LEFT);
add_slider_binding (binding_set, GDK_Left, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_KP_Left, 0,
GTK_SCROLL_STEP_LEFT);
add_slider_binding (binding_set, GDK_KP_Left, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_Right, 0,
GTK_SCROLL_STEP_RIGHT);
add_slider_binding (binding_set, GDK_Right, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_KP_Right, 0,
GTK_SCROLL_STEP_RIGHT);
add_slider_binding (binding_set, GDK_KP_Right, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_Up, 0,
GTK_SCROLL_STEP_UP);
add_slider_binding (binding_set, GDK_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_KP_Up, 0,
GTK_SCROLL_STEP_UP);
add_slider_binding (binding_set, GDK_KP_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_Down, 0,
GTK_SCROLL_STEP_DOWN);
add_slider_binding (binding_set, GDK_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_DOWN);
add_slider_binding (binding_set, GDK_KP_Down, 0,
GTK_SCROLL_STEP_DOWN);
add_slider_binding (binding_set, GDK_KP_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_DOWN);
add_slider_binding (binding_set, GDK_Page_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_KP_Page_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_Page_Up, 0,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_KP_Page_Up, 0,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_KP_Page_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_Page_Down, 0,
GTK_SCROLL_PAGE_DOWN);
add_slider_binding (binding_set, GDK_KP_Page_Down, 0,
GTK_SCROLL_PAGE_DOWN);
/* Logical bindings (vs. visual bindings above) */
add_slider_binding (binding_set, GDK_plus, 0,
GTK_SCROLL_STEP_FORWARD);
add_slider_binding (binding_set, GDK_minus, 0,
GTK_SCROLL_STEP_BACKWARD);
add_slider_binding (binding_set, GDK_plus, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_FORWARD);
add_slider_binding (binding_set, GDK_minus, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_BACKWARD);
add_slider_binding (binding_set, GDK_KP_Add, 0,
GTK_SCROLL_STEP_FORWARD);
add_slider_binding (binding_set, GDK_KP_Subtract, 0,
GTK_SCROLL_STEP_BACKWARD);
add_slider_binding (binding_set, GDK_KP_Add, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_FORWARD);
add_slider_binding (binding_set, GDK_KP_Subtract, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_BACKWARD);
add_slider_binding (binding_set, GDK_Home, 0,
GTK_SCROLL_START);
add_slider_binding (binding_set, GDK_KP_Home, 0,
GTK_SCROLL_START);
add_slider_binding (binding_set, GDK_End, 0,
GTK_SCROLL_END);
add_slider_binding (binding_set, GDK_KP_End, 0,
GTK_SCROLL_END);
g_type_class_add_private (gobject_class, sizeof (GtkScalePrivate));
}
static void
gtk_scale_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkScale *scale;
scale = GTK_SCALE (object);
switch (prop_id)
{
case PROP_DIGITS:
gtk_scale_set_digits (scale, g_value_get_int (value));
break;
case PROP_DRAW_VALUE:
gtk_scale_set_draw_value (scale, g_value_get_boolean (value));
break;
case PROP_VALUE_POS:
gtk_scale_set_value_pos (scale, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scale_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkScale *scale;
scale = GTK_SCALE (object);
switch (prop_id)
{
case PROP_DIGITS:
g_value_set_int (value, scale->digits);
break;
case PROP_DRAW_VALUE:
g_value_set_boolean (value, scale->draw_value);
break;
case PROP_VALUE_POS:
g_value_set_enum (value, scale->value_pos);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scale_init (GtkScale *scale)
{
GtkRange *range;
range = GTK_RANGE (scale);
GTK_WIDGET_SET_FLAGS (scale, GTK_CAN_FOCUS);
range->slider_size_fixed = TRUE;
range->has_stepper_a = FALSE;
range->has_stepper_b = FALSE;
range->has_stepper_c = FALSE;
range->has_stepper_d = FALSE;
scale->draw_value = TRUE;
scale->value_pos = GTK_POS_TOP;
scale->digits = 1;
range->round_digits = scale->digits;
}
void
gtk_scale_set_digits (GtkScale *scale,
gint digits)
{
GtkRange *range;
g_return_if_fail (GTK_IS_SCALE (scale));
range = GTK_RANGE (scale);
digits = CLAMP (digits, -1, MAX_DIGITS);
if (scale->digits != digits)
{
scale->digits = digits;
if (scale->draw_value)
range->round_digits = digits;
_gtk_scale_clear_layout (scale);
gtk_widget_queue_resize (GTK_WIDGET (scale));
g_object_notify (G_OBJECT (scale), "digits");
}
}
gint
gtk_scale_get_digits (GtkScale *scale)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), -1);
return scale->digits;
}
void
gtk_scale_set_draw_value (GtkScale *scale,
gboolean draw_value)
{
g_return_if_fail (GTK_IS_SCALE (scale));
draw_value = draw_value != FALSE;
if (scale->draw_value != draw_value)
{
scale->draw_value = draw_value;
if (draw_value)
GTK_RANGE (scale)->round_digits = scale->digits;
else
GTK_RANGE (scale)->round_digits = -1;
_gtk_scale_clear_layout (scale);
gtk_widget_queue_resize (GTK_WIDGET (scale));
g_object_notify (G_OBJECT (scale), "draw-value");
}
}
gboolean
gtk_scale_get_draw_value (GtkScale *scale)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), FALSE);
return scale->draw_value;
}
void
gtk_scale_set_value_pos (GtkScale *scale,
GtkPositionType pos)
{
g_return_if_fail (GTK_IS_SCALE (scale));
if (scale->value_pos != pos)
{
scale->value_pos = pos;
_gtk_scale_clear_layout (scale);
if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
gtk_widget_queue_resize (GTK_WIDGET (scale));
g_object_notify (G_OBJECT (scale), "value-pos");
}
}
GtkPositionType
gtk_scale_get_value_pos (GtkScale *scale)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
return scale->value_pos;
}
static void
gtk_scale_get_range_border (GtkRange *range,
GtkBorder *border)
{
GtkWidget *widget;
GtkScale *scale;
gint w, h;
widget = GTK_WIDGET (range);
scale = GTK_SCALE (range);
_gtk_scale_get_value_size (scale, &w, &h);
border->left = 0;
border->right = 0;
border->top = 0;
border->bottom = 0;
if (scale->draw_value)
{
gint value_spacing;
gtk_widget_style_get (widget, "value-spacing", &value_spacing, NULL);
switch (scale->value_pos)
{
case GTK_POS_LEFT:
border->left += w + value_spacing;
break;
case GTK_POS_RIGHT:
border->right += w + value_spacing;
break;
case GTK_POS_TOP:
border->top += h + value_spacing;
break;
case GTK_POS_BOTTOM:
border->bottom += h + value_spacing;
break;
}
}
}
/* FIXME this could actually be static at the moment. */
void
_gtk_scale_get_value_size (GtkScale *scale,
gint *width,
gint *height)
{
GtkRange *range;
g_return_if_fail (GTK_IS_SCALE (scale));
if (scale->draw_value)
{
PangoLayout *layout;
PangoRectangle logical_rect;
gchar *txt;
range = GTK_RANGE (scale);
layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
txt = _gtk_scale_format_value (scale, range->adjustment->lower);
pango_layout_set_text (layout, txt, -1);
g_free (txt);
pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
if (width)
*width = logical_rect.width;
if (height)
*height = logical_rect.height;
txt = _gtk_scale_format_value (scale, range->adjustment->upper);
pango_layout_set_text (layout, txt, -1);
g_free (txt);
pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
if (width)
*width = MAX (*width, logical_rect.width);
if (height)
*height = MAX (*height, logical_rect.height);
g_object_unref (layout);
}
else
{
if (width)
*width = 0;
if (height)
*height = 0;
}
}
static void
gtk_scale_style_set (GtkWidget *widget,
GtkStyle *previous)
{
gint slider_length;
GtkRange *range;
range = GTK_RANGE (widget);
gtk_widget_style_get (widget,
"slider-length", &slider_length,
NULL);
range->min_slider_size = slider_length;
_gtk_scale_clear_layout (GTK_SCALE (widget));
(* GTK_WIDGET_CLASS (gtk_scale_parent_class)->style_set) (widget, previous);
}
static void
gtk_scale_screen_changed (GtkWidget *widget,
GdkScreen *old_screen)
{
_gtk_scale_clear_layout (GTK_SCALE (widget));
}
/**
* _gtk_scale_format_value:
* @scale: a #GtkScale
* @value: adjustment value
*
* Emits "format_value" signal to format the value, if no user
* signal handlers, falls back to a default format.
*
* Return value: formatted value
**/
gchar*
_gtk_scale_format_value (GtkScale *scale,
gdouble value)
{
gchar *fmt = NULL;
g_signal_emit (scale,
signals[FORMAT_VALUE],
0,
value,
&fmt);
if (fmt)
return fmt;
else
/* insert a LRM, to prevent -20 to come out as 20- in RTL locales */
return g_strdup_printf ("\342\200\216%0.*f", scale->digits, value);
}
static void
gtk_scale_finalize (GObject *object)
{
GtkScale *scale;
g_return_if_fail (GTK_IS_SCALE (object));
scale = GTK_SCALE (object);
_gtk_scale_clear_layout (scale);
G_OBJECT_CLASS (gtk_scale_parent_class)->finalize (object);
}
/**
* gtk_scale_get_layout:
* @scale: A #GtkScale
*
* Gets the #PangoLayout used to display the scale. The returned object
* is owned by the scale so does not need to be freed by the caller.
*
* Return value: the #PangoLayout for this scale, or %NULL if the draw_value property
* is %FALSE.
*
* Since: 2.4
**/
PangoLayout *
gtk_scale_get_layout (GtkScale *scale)
{
GtkScalePrivate *priv = GTK_SCALE_GET_PRIVATE (scale);
gchar *txt;
g_return_val_if_fail (GTK_IS_SCALE (scale), NULL);
if (!priv->layout)
{
if (scale->draw_value)
priv->layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
}
if (scale->draw_value)
{
txt = _gtk_scale_format_value (scale,
GTK_RANGE (scale)->adjustment->value);
pango_layout_set_text (priv->layout, txt, -1);
g_free (txt);
}
return priv->layout;
}
/**
* gtk_scale_get_layout_offsets:
* @scale: a #GtkScale
* @x: location to store X offset of layout, or %NULL
* @y: location to store Y offset of layout, or %NULL
*
* Obtains the coordinates where the scale will draw the #PangoLayout
* representing the text in the scale. Remember
* when using the #PangoLayout function you need to convert to
* and from pixels using PANGO_PIXELS() or #PANGO_SCALE.
*
* If the draw_value property is %FALSE, the return values are
* undefined.
*
* Since: 2.4
**/
void
gtk_scale_get_layout_offsets (GtkScale *scale,
gint *x,
gint *y)
{
gint local_x = 0;
gint local_y = 0;
g_return_if_fail (GTK_IS_SCALE (scale));
if (GTK_SCALE_GET_CLASS (scale)->get_layout_offsets)
(GTK_SCALE_GET_CLASS (scale)->get_layout_offsets) (scale, &local_x, &local_y);
if (x)
*x = local_x;
if (y)
*y = local_y;
}
void _gtk_scale_clear_layout (GtkScale *scale)
{
GtkScalePrivate *priv = GTK_SCALE_GET_PRIVATE (scale);
g_return_if_fail (GTK_IS_SCALE (scale));
if (priv->layout)
{
g_object_unref (priv->layout);
priv->layout = NULL;
}
}
#define __GTK_SCALE_C__
#include "gtkaliasdef.c"
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