src/widgets/button.cpp

	button.cpp revision 8c8ef8f6b62e09ebb1b519c22905826210346968
#define __SP_BUTTON_C__

/*
 * Generic button widget
 *
 * Authors:
 *   MenTaLguY <mental@rydia.net>
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   bulia byak <buliabyak@users.sf.net>
 *
 * Copyright (C) 2002 Lauris Kaplinski
 *
 * This code is in public domain
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "icon.h"
#include "shortcuts.h"
#include "interface.h"

#include <gdk/gdkkeysyms.h>

#include "button.h"

static void sp_button_class_init (SPButtonClass *klass);
static void sp_button_init (SPButton *button);
static void sp_button_dispose(GObject *object);

#if GTK_CHECK_VERSION(3,0,0)
static void sp_button_get_preferred_width(GtkWidget *widget,
                                          gint *minimal_width,
                      gint *natural_width);

static void sp_button_get_preferred_height(GtkWidget *widget,
                                           gint *minimal_height,
                       gint *natural_height);
#else
static void sp_button_size_request (GtkWidget *widget, GtkRequisition *requisition);
#endif

static void sp_button_clicked (GtkButton *button);
static void sp_button_perform_action (SPButton *button, gpointer data);
static gint sp_button_process_event (SPButton *button, GdkEvent *event);

static void sp_button_set_action (SPButton *button, SPAction *action);
static void sp_button_set_doubleclick_action (SPButton *button, SPAction *action);
static void sp_button_action_set_active (SPButton *button, bool active);
static void sp_button_set_composed_tooltip (GtkWidget *widget, SPAction *action);

static GtkToggleButtonClass *parent_class;

GType sp_button_get_type(void)
{
    static GType type = 0;
    if (!type) {
        GTypeInfo info = {
            sizeof(SPButtonClass),
            0, // base_init
            0, // base_finalize
            (GClassInitFunc)sp_button_class_init,
            0, // class_finalize
            0, // class_data
            sizeof(SPButton),
            0, // n_preallocs
            (GInstanceInitFunc)sp_button_init,
            0 // value_table
        };
        type = g_type_register_static(GTK_TYPE_TOGGLE_BUTTON, "SPButton", &info, static_cast<GTypeFlags>(0));
    }
    return type;
}

static void
sp_button_class_init (SPButtonClass *klass)
{
    GObjectClass *object_class=(GObjectClass *)klass;
    GtkWidgetClass *widget_class=(GtkWidgetClass *)klass;
    GtkButtonClass *button_class=(GtkButtonClass *)klass;

    parent_class = (GtkToggleButtonClass *)g_type_class_peek_parent (klass);

    object_class->dispose = sp_button_dispose;
#if GTK_CHECK_VERSION(3,0,0)
    widget_class->get_preferred_width = sp_button_get_preferred_width;
    widget_class->get_preferred_height = sp_button_get_preferred_height;
#else
    widget_class->size_request = sp_button_size_request;
#endif
    button_class->clicked = sp_button_clicked;
}

static void
sp_button_init (SPButton *button)
{
    button->action = NULL;
    button->doubleclick_action = NULL;
    new (&button->c_set_active) sigc::connection();
    new (&button->c_set_sensitive) sigc::connection();

    gtk_container_set_border_width (GTK_CONTAINER (button), 0);

    gtk_widget_set_can_focus (GTK_WIDGET (button), FALSE);
    gtk_widget_set_can_default (GTK_WIDGET (button), FALSE);

    g_signal_connect_after (G_OBJECT (button), "clicked", G_CALLBACK (sp_button_perform_action), NULL);
    g_signal_connect_after (G_OBJECT (button), "event", G_CALLBACK (sp_button_process_event), NULL);
}

static void sp_button_dispose(GObject *object)
{
    SPButton *button = SP_BUTTON (object);

    if (button->action) {
        sp_button_set_action (button, NULL);
    }
    if (button->doubleclick_action) {
        sp_button_set_doubleclick_action (button, NULL);
    }

    button->c_set_active.~connection();
    button->c_set_sensitive.~connection();

    ((GObjectClass *) (parent_class))->dispose(object);
}


#if GTK_CHECK_VERSION(3,0,0)
static void sp_button_get_preferred_width(GtkWidget *widget, gint *minimal_width, gint *natural_width)
{
    GtkWidget *child = gtk_bin_get_child(GTK_BIN (widget));
    GtkStyle  *style = gtk_widget_get_style(widget);

    if (child) {
        gtk_widget_get_preferred_width(GTK_WIDGET(child), minimal_width, natural_width);
    } else {
        *minimal_width = 0;
        *natural_width = 0;
    }

    *minimal_width += 2 + 2 * MAX(2, style->xthickness);
    *natural_width += 2 + 2 * MAX(2, style->xthickness);
}

static void sp_button_get_preferred_height(GtkWidget *widget, gint *minimal_height, gint *natural_height)
{
    GtkWidget *child = gtk_bin_get_child(GTK_BIN (widget));
    GtkStyle  *style = gtk_widget_get_style(widget);

    if (child) {
        gtk_widget_get_preferred_height(GTK_WIDGET(child), minimal_height, natural_height);
    } else {
        *minimal_height = 0;
        *natural_height = 0;
    }

    *minimal_height += 2 + 2 * MAX(2, style->ythickness);
    *natural_height += 2 + 2 * MAX(2, style->ythickness);

}
#else
static void sp_button_size_request(GtkWidget *widget, GtkRequisition *requisition)
{
    GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
    GtkStyle  *style = gtk_widget_get_style (widget);

    if (child) {
        gtk_widget_size_request (GTK_WIDGET (child), requisition);
    } else {
        requisition->width = 0;
        requisition->height = 0;
    }

    requisition->width += 2 + 2 * MAX (2, style->xthickness);
    requisition->height += 2 + 2 * MAX (2, style->ythickness);
}
#endif

static void
sp_button_clicked (GtkButton *button)
{
    SPButton *sp_button=SP_BUTTON (button);

    if (sp_button->type == SP_BUTTON_TYPE_TOGGLE) {
        ((GtkButtonClass *) (parent_class))->clicked (button);
    }
}

static gint
sp_button_process_event (SPButton *button, GdkEvent *event)
{
    switch (event->type) {
    case GDK_2BUTTON_PRESS:
        if (button->doubleclick_action) {
            sp_action_perform (button->doubleclick_action, NULL);
        }
        return TRUE;
        break;
    default:
        break;
    }

    return FALSE;
}

static void
sp_button_perform_action (SPButton *button, gpointer /*data*/)
{
    if (button->action) {
        sp_action_perform (button->action, NULL);
    }
}


GtkWidget *
sp_button_new( Inkscape::IconSize size, SPButtonType type, SPAction *action, SPAction *doubleclick_action )
{
    SPButton *button;

    button = (SPButton *)g_object_new (SP_TYPE_BUTTON, NULL);

    button->type = type;
    button->lsize = CLAMP( size, Inkscape::ICON_SIZE_MENU, Inkscape::ICON_SIZE_DECORATION );

    sp_button_set_action (button, action);
    if (doubleclick_action)
        sp_button_set_doubleclick_action (button, doubleclick_action);

    // The Inkscape style is no-relief buttons
    gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);

    return (GtkWidget *) button;
}

void
sp_button_toggle_set_down (SPButton *button, gboolean down)
{
    g_return_if_fail (button->type == SP_BUTTON_TYPE_TOGGLE);
    g_signal_handlers_block_by_func (G_OBJECT (button), (gpointer)G_CALLBACK (sp_button_perform_action), NULL);
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), (unsigned int)down);
    g_signal_handlers_unblock_by_func (G_OBJECT (button), (gpointer)G_CALLBACK (sp_button_perform_action), NULL);
}

static void
sp_button_set_doubleclick_action (SPButton *button, SPAction *action)
{
    if (button->doubleclick_action) {
        g_object_unref (button->doubleclick_action);
    }
    button->doubleclick_action = action;
    if (action) {
        g_object_ref(action);
    }

}

static void
sp_button_set_action (SPButton *button, SPAction *action)
{
    GtkWidget *child;

    if (button->action) {
        button->c_set_active.disconnect();
        button->c_set_sensitive.disconnect();
        child = gtk_bin_get_child (GTK_BIN (button));
        if (child) {
            gtk_container_remove (GTK_CONTAINER (button), child);
        }
        g_object_unref(button->action);
    }
    button->action = action;
    if (action) {
        g_object_ref(action);
        button->c_set_active = action->signal_set_active.connect(
            sigc::bind<0>(
                sigc::ptr_fun(&sp_button_action_set_active),
                SP_BUTTON(button)));
        button->c_set_sensitive = action->signal_set_sensitive.connect(
            sigc::bind<0>(
                sigc::ptr_fun(&gtk_widget_set_sensitive),
                GTK_WIDGET(button)));
        if (action->image) {
            child = sp_icon_new (button->lsize, action->image);
            gtk_widget_show (child);
            gtk_container_add (GTK_CONTAINER (button), child);
        }
    }

    sp_button_set_composed_tooltip ((GtkWidget *) button, action);
}

static void
sp_button_action_set_active (SPButton *button, bool active)
{
    if (button->type != SP_BUTTON_TYPE_TOGGLE) {
        return;
    }

    /* temporarily lobotomized until SPActions are per-view */
    if (0 && !active != !SP_BUTTON_IS_DOWN (button)) {
        sp_button_toggle_set_down (button, active);
    }
}

static void sp_button_set_composed_tooltip(GtkWidget *widget, SPAction *action)
{
    if (action) {
        unsigned int shortcut = sp_shortcut_get_primary (action->verb);
        if (shortcut != GDK_KEY_VoidSymbol) {
            // there's both action and shortcut

            gchar *key = sp_shortcut_get_label(shortcut);

            gchar *tip = g_strdup_printf ("%s (%s)", action->tip, key);
            gtk_widget_set_tooltip_text(widget, tip);
            g_free(tip);
            g_free(key);
        } else {
            // action has no shortcut
            gtk_widget_set_tooltip_text(widget, action->tip);
        }
    } else {
        // no action
        gtk_widget_set_tooltip_text(widget, NULL);
    }
}

GtkWidget *
sp_button_new_from_data( Inkscape::IconSize size,
             SPButtonType type,
             Inkscape::UI::View::View *view,
             const gchar *name,
             const gchar *tip )
{
    GtkWidget *button;
    SPAction *action=sp_action_new(view, name, name, tip, name, 0);
    button = sp_button_new (size, type, action, NULL);
    g_object_unref(action);
    return button;
}