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gtk2/gtk/gtkcheckbutton.c
Benjamin Otte 971a277419 cssnode: Change style-changed signal 
Instead of having old and new style, now have a GtkCssStyleChange opaque
object that will compute the changes you are interested in for you.

This simplifies change signal handlers quite a bit and avoids lots of
repeated computation in every signal handler.
2015-12-12 02:16:04 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 "gtkcheckbutton.h"
#include "gtkbuttonprivate.h"
#include "gtklabel.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtkrender.h"
#include "gtkwidgetprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkradiobutton.h"
/**
* SECTION:gtkcheckbutton
* @Short_description: Create widgets with a discrete toggle button
* @Title: GtkCheckButton
* @See_also: #GtkCheckMenuItem, #GtkButton, #GtkToggleButton, #GtkRadioButton
*
* A #GtkCheckButton places a discrete #GtkToggleButton next to a widget,
* (usually a #GtkLabel). See the section on #GtkToggleButton widgets for
* more information about toggle/check buttons.
*
* The important signal ( #GtkToggleButton::toggled ) is also inherited from
* #GtkToggleButton.
*
* # CSS nodes
*
* |[<!-- language="plain" -->
* checkbutton
* ╰── check
* ]|
*
* A GtkCheckButton with indicator (see gtk_toggle_button_set_mode()) has a
* main CSS node with name checkbutton and a subnode with name check.
*
* |[<!-- language="plain" -->
* button.check
* ╰── [check]
* ]|
*
* A GtkCheckButton without indicator changes the name of its main node
* to button and adds a .check style class to it. The subnode is invisible
* in this case.
*/
#define INDICATOR_SIZE 16
#define INDICATOR_SPACING 2
static void gtk_check_button_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_check_button_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum,
gint *natural);
static void gtk_check_button_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_check_button_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural);
static void gtk_check_button_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline);
static void gtk_check_button_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gtk_check_button_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_check_button_paint (GtkWidget *widget,
cairo_t *cr);
static void gtk_check_button_draw_indicator (GtkCheckButton *check_button,
cairo_t *cr);
static void gtk_real_check_button_draw_indicator (GtkCheckButton *check_button,
cairo_t *cr);
typedef struct {
GtkCssNode *indicator_node;
} GtkCheckButtonPrivate;
G_DEFINE_TYPE_WITH_PRIVATE (GtkCheckButton, gtk_check_button, GTK_TYPE_TOGGLE_BUTTON)
static void
gtk_check_button_state_flags_changed (GtkWidget *widget,
GtkStateFlags previous_state_flags)
{
GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (GTK_CHECK_BUTTON (widget));
gtk_css_node_set_state (priv->indicator_node, gtk_widget_get_state_flags (widget));
GTK_WIDGET_CLASS (gtk_check_button_parent_class)->state_flags_changed (widget, previous_state_flags);
}
static void
gtk_check_button_class_init (GtkCheckButtonClass *class)
{
GtkWidgetClass *widget_class;
widget_class = (GtkWidgetClass*) class;
widget_class->get_preferred_width = gtk_check_button_get_preferred_width;
widget_class->get_preferred_width_for_height = gtk_check_button_get_preferred_width_for_height;
widget_class->get_preferred_height = gtk_check_button_get_preferred_height;
widget_class->get_preferred_height_for_width = gtk_check_button_get_preferred_height_for_width;
widget_class->get_preferred_height_and_baseline_for_width = gtk_check_button_get_preferred_height_and_baseline_for_width;
widget_class->size_allocate = gtk_check_button_size_allocate;
widget_class->draw = gtk_check_button_draw;
widget_class->state_flags_changed = gtk_check_button_state_flags_changed;
class->draw_indicator = gtk_real_check_button_draw_indicator;
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("indicator-size",
P_("Indicator Size"),
P_("Size of check or radio indicator"),
0,
G_MAXINT,
INDICATOR_SIZE,
GTK_PARAM_READABLE));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("indicator-spacing",
P_("Indicator Spacing"),
P_("Spacing around check or radio indicator"),
0,
G_MAXINT,
INDICATOR_SPACING,
GTK_PARAM_READABLE));
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_CHECK_BOX);
gtk_widget_class_set_css_name (widget_class, "checkbutton");
}
static void
draw_indicator_changed (GObject *object,
GParamSpec *pspec,
gpointer user_data)
{
GtkButton *button = GTK_BUTTON (object);
GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (GTK_CHECK_BUTTON (button));
GtkCssNode *widget_node;
widget_node = gtk_widget_get_css_node (GTK_WIDGET (button));
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
if (gtk_toggle_button_get_mode (GTK_TOGGLE_BUTTON (button)))
{
gtk_button_set_alignment (button, 0.0, 0.5);
gtk_css_node_set_visible (priv->indicator_node, TRUE);
if (GTK_IS_RADIO_BUTTON (button))
{
gtk_css_node_remove_class (widget_node, g_quark_from_static_string ("radio"));
gtk_css_node_set_name (widget_node, I_("radiobutton"));
}
else if (GTK_IS_CHECK_BUTTON (button))
{
gtk_css_node_remove_class (widget_node, g_quark_from_static_string ("check"));
gtk_css_node_set_name (widget_node, I_("checkbutton"));
}
}
else
{
gtk_button_set_alignment (button, 0.5, 0.5);
gtk_css_node_set_visible (priv->indicator_node, FALSE);
if (GTK_IS_RADIO_BUTTON (button))
{
gtk_css_node_add_class (widget_node, g_quark_from_static_string ("radio"));
gtk_css_node_set_name (widget_node, I_("button"));
}
else if (GTK_IS_CHECK_BUTTON (button))
{
gtk_css_node_add_class (widget_node, g_quark_from_static_string ("check"));
gtk_css_node_set_name (widget_node, I_("button"));
}
}
G_GNUC_END_IGNORE_DEPRECATIONS
}
static void
node_style_changed_cb (GtkCssNode *node,
GtkCssStyleChange *change,
GtkWidget *widget)
{
if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SIZE | GTK_CSS_AFFECTS_CLIP))
gtk_widget_queue_resize (widget);
else
gtk_widget_queue_draw (widget);
}
static void
gtk_check_button_init (GtkCheckButton *check_button)
{
GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (check_button);
GtkCssNode *widget_node;
gtk_widget_set_receives_default (GTK_WIDGET (check_button), FALSE);
g_signal_connect (check_button, "notify::draw-indicator", G_CALLBACK (draw_indicator_changed), NULL);
gtk_toggle_button_set_mode (GTK_TOGGLE_BUTTON (check_button), TRUE);
gtk_style_context_remove_class (gtk_widget_get_style_context (GTK_WIDGET (check_button)), "toggle");
widget_node = gtk_widget_get_css_node (GTK_WIDGET (check_button));
priv->indicator_node = gtk_css_node_new ();
gtk_css_node_set_name (priv->indicator_node, I_("check"));
gtk_css_node_set_parent (priv->indicator_node, widget_node);
gtk_css_node_set_state (priv->indicator_node, gtk_css_node_get_state (widget_node));
g_signal_connect_object (priv->indicator_node, "style-changed", G_CALLBACK (node_style_changed_cb), check_button, 0);
g_object_unref (priv->indicator_node);
}
/**
* gtk_check_button_new:
*
* Creates a new #GtkCheckButton.
*
* Returns: a #GtkWidget.
*/
GtkWidget*
gtk_check_button_new (void)
{
return g_object_new (GTK_TYPE_CHECK_BUTTON, NULL);
}
/**
* gtk_check_button_new_with_label:
* @label: the text for the check button.
*
* Creates a new #GtkCheckButton with a #GtkLabel to the right of it.
*
* Returns: a #GtkWidget.
*/
GtkWidget*
gtk_check_button_new_with_label (const gchar *label)
{
return g_object_new (GTK_TYPE_CHECK_BUTTON, "label", label, NULL);
}
/**
* gtk_check_button_new_with_mnemonic:
* @label: The text of the button, with an underscore in front of the
* mnemonic character
*
* Creates a new #GtkCheckButton containing a label. The label
* will be created using gtk_label_new_with_mnemonic(), so underscores
* in @label indicate the mnemonic for the check button.
*
* Returns: a new #GtkCheckButton
*/
GtkWidget*
gtk_check_button_new_with_mnemonic (const gchar *label)
{
return g_object_new (GTK_TYPE_CHECK_BUTTON,
"label", label,
"use-underline", TRUE,
NULL);
}
/* This should only be called when toggle_button->draw_indicator
* is true.
*/
static void
gtk_check_button_paint (GtkWidget *widget,
cairo_t *cr)
{
GtkCheckButton *check_button = GTK_CHECK_BUTTON (widget);
gtk_check_button_draw_indicator (check_button, cr);
if (gtk_widget_has_visible_focus (widget))
{
GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
GtkStyleContext *context;
GtkAllocation allocation;
gint border_width;
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
gtk_widget_get_allocation (widget, &allocation);
context = gtk_widget_get_style_context (widget);
if (child && gtk_widget_get_visible (child))
{
GtkAllocation child_allocation;
gtk_widget_get_allocation (child, &child_allocation);
gtk_render_focus (context, cr,
child_allocation.x - allocation.x,
child_allocation.y - allocation.y,
child_allocation.width,
child_allocation.height);
}
else
gtk_render_focus (context, cr,
border_width, border_width,
allocation.width - 2 * border_width,
allocation.height - 2 * border_width);
}
}
void
_gtk_check_button_get_props (GtkCheckButton *check_button,
gint *indicator_size,
gint *indicator_spacing)
{
GtkWidget *widget = GTK_WIDGET (check_button);
if (indicator_size)
gtk_widget_style_get (widget, "indicator-size", indicator_size, NULL);
if (indicator_spacing)
gtk_widget_style_get (widget, "indicator-spacing", indicator_spacing, NULL);
}
static void
get_padding_and_border (GtkWidget *widget,
GtkBorder *border)
{
GtkStyleContext *context;
GtkStateFlags state;
GtkBorder tmp;
context = gtk_widget_get_style_context (widget);
state = gtk_style_context_get_state (context);
gtk_style_context_get_padding (context, state, border);
gtk_style_context_get_border (context, state, &tmp);
border->top += tmp.top;
border->right += tmp.right;
border->bottom += tmp.bottom;
border->left += tmp.left;
}
static void
gtk_check_button_get_full_border (GtkCheckButton *check_button,
GtkBorder *border,
gint *indicator)
{
int indicator_size, indicator_spacing, indicator_extra, border_width;
GtkWidget *child;
get_padding_and_border (GTK_WIDGET (check_button), border);
border_width = gtk_container_get_border_width (GTK_CONTAINER (check_button));
gtk_widget_style_get (GTK_WIDGET (check_button),
"indicator-size", &indicator_size,
"indicator-spacing", &indicator_spacing,
NULL);
child = gtk_bin_get_child (GTK_BIN (check_button));
border->left += border_width;
border->right += border_width;
border->top += border_width;
border->bottom += border_width;
indicator_extra = indicator_size + 2 * indicator_spacing;
if (child && gtk_widget_get_visible (child))
indicator_extra += indicator_spacing;
if (gtk_widget_get_direction (GTK_WIDGET (check_button)) == GTK_TEXT_DIR_RTL)
border->right += indicator_extra;
else
border->left += indicator_extra;
if (indicator)
*indicator = indicator_size + 2 * indicator_spacing;
}
static void
gtk_check_button_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum,
gint *natural)
{
GtkToggleButton *toggle_button = GTK_TOGGLE_BUTTON (widget);
if (gtk_toggle_button_get_mode (toggle_button))
{
GtkWidget *child;
GtkBorder border;
gtk_check_button_get_full_border (GTK_CHECK_BUTTON (widget), &border, NULL);
child = gtk_bin_get_child (GTK_BIN (widget));
if (child && gtk_widget_get_visible (child))
{
if (height > -1)
height -= border.top + border.bottom;
_gtk_widget_get_preferred_size_for_size (child,
GTK_ORIENTATION_HORIZONTAL,
height,
minimum, natural,
NULL, NULL);
}
else
{
*minimum = 0;
*natural = 0;
}
*minimum += border.left + border.right;
*natural += border.left + border.right;
}
else
GTK_WIDGET_CLASS (gtk_check_button_parent_class)->get_preferred_width (widget, minimum, natural);
}
static void
gtk_check_button_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
gtk_check_button_get_preferred_width_for_height (widget, -1, minimum, natural);
}
static void
gtk_check_button_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkToggleButton *toggle_button = GTK_TOGGLE_BUTTON (widget);
if (gtk_toggle_button_get_mode (toggle_button))
{
GtkWidget *child;
GtkBorder border;
gint indicator;
gtk_check_button_get_full_border (GTK_CHECK_BUTTON (widget), &border, &indicator);
child = gtk_bin_get_child (GTK_BIN (widget));
if (child && gtk_widget_get_visible (child))
{
gint child_min, child_nat;
gint child_min_baseline = -1, child_nat_baseline = -1;
if (width > -1)
width -= border.left + border.right;
gtk_widget_get_preferred_height_and_baseline_for_width (child, width,
&child_min, &child_nat,
&child_min_baseline, &child_nat_baseline);
*minimum = MAX (indicator, child_min);
*natural = MAX (indicator, child_nat);
if (minimum_baseline && child_min_baseline >= 0)
*minimum_baseline = child_min_baseline + border.top + (*minimum - child_min) / 2;
if (natural_baseline && child_nat_baseline >= 0)
*natural_baseline = child_nat_baseline + border.top + (*natural - child_nat) / 2;
}
else
{
*minimum = indicator;
*natural = indicator;
}
*minimum += border.top + border.bottom;
*natural += border.top + border.bottom;
}
else
GTK_WIDGET_CLASS (gtk_check_button_parent_class)->get_preferred_height_and_baseline_for_width (widget, width,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_check_button_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural)
{
gtk_check_button_get_preferred_height_and_baseline_for_width (widget, width,
minimum, natural,
NULL, NULL);
}
static void
gtk_check_button_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
gtk_check_button_get_preferred_height_and_baseline_for_width (widget, -1,
minimum, natural,
NULL, NULL);
}
static void
gtk_check_button_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
PangoContext *pango_context;
PangoFontMetrics *metrics;
GtkCheckButton *check_button;
GtkToggleButton *toggle_button;
GtkButton *button;
GtkAllocation child_allocation;
gint baseline;
button = GTK_BUTTON (widget);
check_button = GTK_CHECK_BUTTON (widget);
toggle_button = GTK_TOGGLE_BUTTON (widget);
if (gtk_toggle_button_get_mode (toggle_button))
{
GtkWidget *child;
gtk_widget_set_allocation (widget, allocation);
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (gtk_button_get_event_window (button),
allocation->x, allocation->y,
allocation->width, allocation->height);
child = gtk_bin_get_child (GTK_BIN (button));
if (child && gtk_widget_get_visible (child))
{
GtkBorder border;
gtk_check_button_get_full_border (check_button, &border, NULL);
child_allocation.x = allocation->x + border.left;
child_allocation.y = allocation->y + border.top;
child_allocation.width = allocation->width - border.left - border.right;
child_allocation.height = allocation->height - border.top - border.bottom;
baseline = gtk_widget_get_allocated_baseline (widget);
if (baseline != -1)
baseline -= border.top;
gtk_widget_size_allocate_with_baseline (child, &child_allocation, baseline);
}
pango_context = gtk_widget_get_pango_context (widget);
metrics = pango_context_get_metrics (pango_context,
pango_context_get_font_description (pango_context),
pango_context_get_language (pango_context));
button->priv->baseline_align =
(double)pango_font_metrics_get_ascent (metrics) /
(pango_font_metrics_get_ascent (metrics) + pango_font_metrics_get_descent (metrics));
pango_font_metrics_unref (metrics);
}
else
GTK_WIDGET_CLASS (gtk_check_button_parent_class)->size_allocate (widget, allocation);
}
static gint
gtk_check_button_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkToggleButton *toggle_button;
GtkBin *bin;
GtkWidget *child;
toggle_button = GTK_TOGGLE_BUTTON (widget);
bin = GTK_BIN (widget);
if (gtk_toggle_button_get_mode (toggle_button))
{
gtk_check_button_paint (widget, cr);
child = gtk_bin_get_child (bin);
if (child)
gtk_container_propagate_draw (GTK_CONTAINER (widget),
child,
cr);
}
else if (GTK_WIDGET_CLASS (gtk_check_button_parent_class)->draw)
GTK_WIDGET_CLASS (gtk_check_button_parent_class)->draw (widget, cr);
return FALSE;
}
static void
gtk_check_button_draw_indicator (GtkCheckButton *check_button,
cairo_t *cr)
{
GtkCheckButtonClass *class = GTK_CHECK_BUTTON_GET_CLASS (check_button);
if (class->draw_indicator)
class->draw_indicator (check_button, cr);
}
static void
gtk_real_check_button_draw_indicator (GtkCheckButton *check_button,
cairo_t *cr)
{
GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (check_button);
GtkWidget *widget;
GtkButton *button;
gint x, y;
gint indicator_size;
gint indicator_spacing;
gint baseline;
guint border_width;
GtkAllocation allocation;
GtkStyleContext *context;
widget = GTK_WIDGET (check_button);
button = GTK_BUTTON (check_button);
gtk_widget_get_allocation (widget, &allocation);
baseline = gtk_widget_get_allocated_baseline (widget);
context = gtk_widget_get_style_context (widget);
_gtk_check_button_get_props (check_button, &indicator_size, &indicator_spacing);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
x = indicator_spacing + border_width;
if (baseline == -1)
y = (allocation.height - indicator_size) / 2;
else
y = CLAMP (baseline - indicator_size * button->priv->baseline_align,
0, allocation.height - indicator_size);
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
x = allocation.width - (indicator_size + x);
gtk_style_context_save_to_node (context, priv->indicator_node);
gtk_render_background (context, cr,
border_width, border_width,
allocation.width - (2 * border_width),
allocation.height - (2 * border_width));
gtk_render_check (context, cr,
x, y, indicator_size, indicator_size);
gtk_style_context_restore (context);
}
GtkCssNode *
gtk_check_button_get_indicator_node (GtkCheckButton *check_button)
{
GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (check_button);
return priv->indicator_node;
}
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