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gimp/libgimpwidgets/gimpchainbutton.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpchainbutton.c
* Copyright (C) 1999-2000 Sven Neumann <sven@gimp.org>
*
* 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 3 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
* Library 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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "gimpwidgetstypes.h"
#include "gimpchainbutton.h"
#include "gimpicons.h"
/**
* SECTION: gimpchainbutton
* @title: GimpChainButton
* @short_description: Widget to visually connect two entry widgets.
* @see_also: You may want to use the convenience function
* gimp_coordinates_new() to set up two GimpSizeEntries
* (see #GimpSizeEntry) linked with a #GimpChainButton.
*
* This widget provides a button showing either a linked or a broken
* chain that can be used to link two entries, spinbuttons, colors or
* other GUI elements and show that they may be locked. Use it for
* example to connect X and Y ratios to provide the possibility of a
* constrained aspect ratio.
*
* The #GimpChainButton only gives visual feedback, it does not really
* connect widgets. You have to take care of locking the values
* yourself by checking the state of the #GimpChainButton whenever a
* value changes in one of the connected widgets and adjusting the
* other value if necessary.
**/
enum
{
PROP_0,
PROP_POSITION
};
enum
{
TOGGLED,
LAST_SIGNAL
};
struct _GimpChainButtonPrivate
{
GimpChainPosition position;
gboolean active;
GtkWidget *button;
GtkWidget *line1;
GtkWidget *line2;
GtkWidget *image;
};
#define GET_PRIVATE(obj) (((GimpChainButton *) (obj))->priv)
static void gimp_chain_button_constructed (GObject *object);
static void gimp_chain_button_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_chain_button_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_chain_button_clicked_callback (GtkWidget *widget,
GimpChainButton *button);
static void gimp_chain_button_update_image (GimpChainButton *button);
static GtkWidget * gimp_chain_line_new (GimpChainPosition position,
gint which);
G_DEFINE_TYPE (GimpChainButton, gimp_chain_button, GTK_TYPE_GRID)
#define parent_class gimp_chain_button_parent_class
static guint gimp_chain_button_signals[LAST_SIGNAL] = { 0 };
static const gchar * const gimp_chain_icon_names[] =
{
GIMP_ICON_CHAIN_HORIZONTAL,
GIMP_ICON_CHAIN_HORIZONTAL_BROKEN,
GIMP_ICON_CHAIN_VERTICAL,
GIMP_ICON_CHAIN_VERTICAL_BROKEN
};
static void
gimp_chain_button_class_init (GimpChainButtonClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = gimp_chain_button_constructed;
object_class->set_property = gimp_chain_button_set_property;
object_class->get_property = gimp_chain_button_get_property;
gimp_chain_button_signals[TOGGLED] =
g_signal_new ("toggled",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpChainButtonClass, toggled),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
klass->toggled = NULL;
/**
* GimpChainButton:position:
*
* The position in which the chain button will be used.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_POSITION,
g_param_spec_enum ("position",
"Position",
"The chain's position",
GIMP_TYPE_CHAIN_POSITION,
GIMP_CHAIN_TOP,
G_PARAM_CONSTRUCT_ONLY |
GIMP_PARAM_READWRITE));
g_type_class_add_private (object_class, sizeof (GimpChainButtonPrivate));
}
static void
gimp_chain_button_init (GimpChainButton *button)
{
GimpChainButtonPrivate *private = GET_PRIVATE (button);
button->priv = G_TYPE_INSTANCE_GET_PRIVATE (button,
GIMP_TYPE_CHAIN_BUTTON,
GimpChainButtonPrivate);
private = GET_PRIVATE (button);
private->position = GIMP_CHAIN_TOP;
private->active = FALSE;
private->image = gtk_image_new ();
private->button = gtk_button_new ();
gtk_button_set_relief (GTK_BUTTON (private->button), GTK_RELIEF_NONE);
gtk_container_add (GTK_CONTAINER (private->button), private->image);
gtk_widget_show (private->image);
g_signal_connect (private->button, "clicked",
G_CALLBACK (gimp_chain_button_clicked_callback),
button);
}
static void
gimp_chain_button_constructed (GObject *object)
{
GimpChainButton *button = GIMP_CHAIN_BUTTON (object);
GimpChainButtonPrivate *private = GET_PRIVATE (button);
G_OBJECT_CLASS (parent_class)->constructed (object);
private->line1 = gimp_chain_line_new (private->position, 1);
private->line2 = gimp_chain_line_new (private->position, -1);
gimp_chain_button_update_image (button);
if (private->position & GIMP_CHAIN_LEFT) /* are we a vertical chainbutton? */
{
gtk_widget_set_vexpand (private->line1, TRUE);
gtk_widget_set_vexpand (private->line2, TRUE);
gtk_grid_attach (GTK_GRID (button), private->line1, 0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (button), private->button, 0, 1, 1, 1);
gtk_grid_attach (GTK_GRID (button), private->line2, 0, 2, 1, 1);
}
else
{
gtk_widget_set_hexpand (private->line1, TRUE);
gtk_widget_set_hexpand (private->line2, TRUE);
gtk_grid_attach (GTK_GRID (button), private->line1, 0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (button), private->button, 1, 0, 1, 1);
gtk_grid_attach (GTK_GRID (button), private->line2, 2, 0, 1, 1);
}
gtk_widget_show (private->button);
gtk_widget_show (private->line1);
gtk_widget_show (private->line2);
}
static void
gimp_chain_button_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpChainButtonPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_POSITION:
private->position = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_chain_button_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpChainButtonPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_POSITION:
g_value_set_enum (value, private->position);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
/**
* gimp_chain_button_new:
* @position: The position you are going to use for the button
* with respect to the widgets you want to chain.
*
* Creates a new #GimpChainButton widget.
*
* This returns a button showing either a broken or a linked chain and
* small clamps attached to both sides that visually group the two
* widgets you want to connect. This widget looks best when attached
* to a grid taking up two columns (or rows respectively) next to the
* widgets that it is supposed to connect. It may work for more than
* two widgets, but the look is optimized for two.
*
* Returns: Pointer to the new #GimpChainButton, which is inactive
* by default. Use gimp_chain_button_set_active() to
* change its state.
*/
GtkWidget *
gimp_chain_button_new (GimpChainPosition position)
{
return g_object_new (GIMP_TYPE_CHAIN_BUTTON,
"position", position,
NULL);
}
/**
* gimp_chain_button_set_active:
* @button: Pointer to a #GimpChainButton.
* @active: The new state.
*
* Sets the state of the #GimpChainButton to be either locked (%TRUE) or
* unlocked (%FALSE) and changes the showed pixmap to reflect the new state.
*/
void
gimp_chain_button_set_active (GimpChainButton *button,
gboolean active)
{
GimpChainButtonPrivate *private;
g_return_if_fail (GIMP_IS_CHAIN_BUTTON (button));
private = GET_PRIVATE (button);
if (private->active != active)
{
private->active = active ? TRUE : FALSE;
gimp_chain_button_update_image (button);
}
}
/**
* gimp_chain_button_get_active
* @button: Pointer to a #GimpChainButton.
*
* Checks the state of the #GimpChainButton.
*
* Returns: %TRUE if the #GimpChainButton is active (locked).
*/
gboolean
gimp_chain_button_get_active (GimpChainButton *button)
{
GimpChainButtonPrivate *private;
g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (button), FALSE);
private = GET_PRIVATE (button);
return private->active;
}
/**
* gimp_chain_button_get_button
* @button: A #GimpChainButton.
*
* Returns: The #GimpChainButton's button.
*
* Since: GIMP 3.0
*/
GtkWidget *
gimp_chain_button_get_button (GimpChainButton *button)
{
GimpChainButtonPrivate *private;
g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (button), FALSE);
private = GET_PRIVATE (button);
return private->button;
}
/* private functions */
static void
gimp_chain_button_clicked_callback (GtkWidget *widget,
GimpChainButton *button)
{
GimpChainButtonPrivate *private = GET_PRIVATE (button);
gimp_chain_button_set_active (button, ! private->active);
g_signal_emit (button, gimp_chain_button_signals[TOGGLED], 0);
}
static void
gimp_chain_button_update_image (GimpChainButton *button)
{
GimpChainButtonPrivate *private = GET_PRIVATE (button);
guint i;
i = ((private->position & GIMP_CHAIN_LEFT) << 1) + (private->active ? 0 : 1);
gtk_image_set_from_icon_name (GTK_IMAGE (private->image),
gimp_chain_icon_names[i],
GTK_ICON_SIZE_BUTTON);
}
/* GimpChainLine is a simple no-window widget for drawing the lines.
*
* Originally this used to be a GtkDrawingArea but this turned out to
* be a bad idea. We don't need an extra window to draw on and we also
* don't need any input events.
*/
static GType gimp_chain_line_get_type (void) G_GNUC_CONST;
static gboolean gimp_chain_line_draw (GtkWidget *widget,
cairo_t *cr);
struct _GimpChainLine
{
GtkWidget parent_instance;
GimpChainPosition position;
gint which;
};
typedef struct _GimpChainLine GimpChainLine;
typedef GtkWidgetClass GimpChainLineClass;
G_DEFINE_TYPE (GimpChainLine, gimp_chain_line, GTK_TYPE_WIDGET)
static void
gimp_chain_line_class_init (GimpChainLineClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
widget_class->draw = gimp_chain_line_draw;
}
static void
gimp_chain_line_init (GimpChainLine *line)
{
gtk_widget_set_has_window (GTK_WIDGET (line), FALSE);
}
static GtkWidget *
gimp_chain_line_new (GimpChainPosition position,
gint which)
{
GimpChainLine *line = g_object_new (gimp_chain_line_get_type (), NULL);
line->position = position;
line->which = which;
return GTK_WIDGET (line);
}
static gboolean
gimp_chain_line_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GimpChainLine *line = ((GimpChainLine *) widget);
GtkAllocation allocation;
GdkPoint points[3];
GimpChainPosition position;
GdkRGBA color;
gtk_widget_get_allocation (widget, &allocation);
#define SHORT_LINE 4
points[0].x = allocation.width / 2;
points[0].y = allocation.height / 2;
position = line->position;
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
{
switch (position)
{
case GIMP_CHAIN_TOP:
case GIMP_CHAIN_BOTTOM:
break;
case GIMP_CHAIN_LEFT:
position = GIMP_CHAIN_RIGHT;
break;
case GIMP_CHAIN_RIGHT:
position = GIMP_CHAIN_LEFT;
break;
}
}
switch (position)
{
case GIMP_CHAIN_LEFT:
points[0].x += SHORT_LINE;
points[1].x = points[0].x - SHORT_LINE;
points[1].y = points[0].y;
points[2].x = points[1].x;
points[2].y = (line->which == 1 ? allocation.height - 1 : 0);
break;
case GIMP_CHAIN_RIGHT:
points[0].x -= SHORT_LINE;
points[1].x = points[0].x + SHORT_LINE;
points[1].y = points[0].y;
points[2].x = points[1].x;
points[2].y = (line->which == 1 ? allocation.height - 1 : 0);
break;
case GIMP_CHAIN_TOP:
points[0].y += SHORT_LINE;
points[1].x = points[0].x;
points[1].y = points[0].y - SHORT_LINE;
points[2].x = (line->which == 1 ? allocation.width - 1 : 0);
points[2].y = points[1].y;
break;
case GIMP_CHAIN_BOTTOM:
points[0].y -= SHORT_LINE;
points[1].x = points[0].x;
points[1].y = points[0].y + SHORT_LINE;
points[2].x = (line->which == 1 ? allocation.width - 1 : 0);
points[2].y = points[1].y;
break;
default:
return FALSE;
}
cairo_move_to (cr, points[0].x, points[0].y);
cairo_line_to (cr, points[1].x, points[1].y);
cairo_line_to (cr, points[2].x, points[2].y);
cairo_set_line_width (cr, 2.0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
gtk_style_context_get_color (context, 0, &color);
gdk_cairo_set_source_rgba (cr, &color);
cairo_stroke (cr);
return TRUE;
}
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