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knotholder.cpp

#define __KNOT_HOLDER_C__

/*
 * Container for SPKnot visual handles
 *
 * Authors:
 *   Mitsuru Oka <oka326@parkcity.ne.jp>
 *   bulia byak <buliabyak@users.sf.net>
 *
 * Copyright (C) 2001-2005 authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#define noKNOT_HOLDER_DEBUG

#include <glib.h>
#include <gtk/gtksignal.h>

#include "document.h"
#include "sp-item.h"
#include "sp-shape.h"
#include "knot.h"
#include "knotholder.h"
#include "knot-holder-entity.h"
#include <libnr/nr-matrix-div.h>
#include <libnr/nr-matrix-ops.h>
#include <libnr/nr-point-matrix-ops.h>

class SPDesktop;

static void knot_clicked_handler (SPKnot *knot, guint state, gpointer data);
static void knot_moved_handler(SPKnot *knot, NR::Point const *p, guint state, gpointer data);
static void knot_ungrabbed_handler (SPKnot *knot, unsigned int state, SPKnotHolder *kh);

#ifdef KNOT_HOLDER_DEBUG
#include <gtk/gtk.h>

static void sp_knot_holder_debug(GtkObject *object, gpointer data)
{
    g_print("sp-knot-holder-debug: [type=%s] [data=%s]\n", gtk_type_name(GTK_OBJECT_TYPE(object)), (const gchar *) data);
}
#endif

SPKnotHolder *sp_knot_holder_new(SPDesktop *desktop, SPItem *item, SPKnotHolderReleasedFunc relhandler)
{
    Inkscape::XML::Node *repr = SP_OBJECT(item)->repr;

    g_return_val_if_fail(desktop != NULL, NULL);
    g_return_val_if_fail(item != NULL, NULL);
    g_return_val_if_fail(SP_IS_ITEM(item), NULL);

    SPKnotHolder *knot_holder = g_new(SPKnotHolder, 1);
    knot_holder->desktop = desktop;
    knot_holder->item = item;
    g_object_ref(G_OBJECT(item));
    knot_holder->entity = NULL;

    knot_holder->released = relhandler;

    knot_holder->repr = repr;
    knot_holder->local_change = FALSE;

#ifdef KNOT_HOLDER_DEBUG
    g_signal_connect(G_OBJECT(desktop), "destroy", sp_knot_holder_debug, (gpointer) "SPKnotHolder::item");
#endif

    return knot_holder;
}

void sp_knot_holder_destroy(SPKnotHolder *kh)
{
    if (kh) {
        g_object_unref(G_OBJECT(kh->item));
        while (kh->entity) {
            SPKnotHolderEntity *e = (SPKnotHolderEntity *) kh->entity->data;
            /* unref should call destroy */
            g_object_unref(G_OBJECT(e->knot));
            g_free(e);
            kh->entity = g_slist_remove(kh->entity, e);
        }
        
        g_free(kh);
    }
}

void sp_knot_holder_add(
    SPKnotHolder *knot_holder,
    SPKnotHolderSetFunc knot_set,
    SPKnotHolderGetFunc knot_get,
    void (* knot_click) (SPItem *item, guint state),
    const gchar *tip
    )
{
    sp_knot_holder_add_full(knot_holder, knot_set, knot_get, knot_click, SP_KNOT_SHAPE_DIAMOND, SP_KNOT_MODE_XOR, tip);
}

void sp_knot_holder_add_full(
    SPKnotHolder *knot_holder,
    SPKnotHolderSetFunc knot_set,
    SPKnotHolderGetFunc knot_get,
    void (* knot_click) (SPItem *item, guint state),
    SPKnotShapeType     shape,
    SPKnotModeType      mode,
    const gchar *tip
    )
{
    g_return_if_fail(knot_holder != NULL);
    g_return_if_fail(knot_set != NULL);
    g_return_if_fail(knot_get != NULL);
      
    SPItem *item = SP_ITEM(knot_holder->item);

    /* create new SPKnotHolderEntry */
    SPKnotHolderEntity *e = g_new(SPKnotHolderEntity, 1);
    e->knot = sp_knot_new(knot_holder->desktop, tip);
    e->knot_set = knot_set;
    e->knot_get = knot_get;
    if (knot_click) {
        e->knot_click = knot_click;
    } else {
        e->knot_click = NULL;
    }

    g_object_set(G_OBJECT (e->knot->item), "shape", shape, NULL);
    g_object_set(G_OBJECT (e->knot->item), "mode", mode, NULL);

    // TODO: add a color argument
    //e->knot->fill [SP_KNOT_STATE_NORMAL] = 0x00ff0000;
    //g_object_set (G_OBJECT (e->knot->item), "fill_color", 0x00ff0000, NULL);

    knot_holder->entity = g_slist_append(knot_holder->entity, e);

    /* Move to current point. */
    NR::Point dp = e->knot_get(item) * sp_item_i2d_affine(item);
    sp_knot_set_position(e->knot, &dp, SP_KNOT_STATE_NORMAL);

    e->handler_id = g_signal_connect(G_OBJECT(e->knot), "moved", G_CALLBACK(knot_moved_handler), knot_holder);
    g_signal_connect(G_OBJECT(e->knot), "clicked", G_CALLBACK(knot_clicked_handler), knot_holder);
    g_signal_connect(G_OBJECT(e->knot), "ungrabbed", G_CALLBACK(knot_ungrabbed_handler), knot_holder);

#ifdef KNOT_HOLDER_DEBUG
    g_signal_connect(ob, "destroy", sp_knot_holder_debug, "SPKnotHolder::knot");
#endif
    sp_knot_show(e->knot);
}

/**
 * \param p In desktop coordinates.
 */

static void knotholder_update_knots(SPKnotHolder *knot_holder, SPItem *item)
{
    NR::Matrix const i2d(sp_item_i2d_affine(item));
    
    for (GSList *el = knot_holder->entity; el; el = el->next) {
        SPKnotHolderEntity *e = (SPKnotHolderEntity *) el->data;
        GObject *kob = G_OBJECT(e->knot);
        
        NR::Point dp( e->knot_get(item) * i2d );
        g_signal_handler_block(kob, e->handler_id);
        sp_knot_set_position(e->knot, &dp, SP_KNOT_STATE_NORMAL);
        g_signal_handler_unblock(kob, e->handler_id);
    }
}

static void knot_clicked_handler(SPKnot *knot, guint state, gpointer data)
{
    SPKnotHolder *knot_holder = (SPKnotHolder *) data;
    SPItem *item  = SP_ITEM (knot_holder->item);

    for (GSList *el = knot_holder->entity; el; el = el->next) {
        SPKnotHolderEntity *e = (SPKnotHolderEntity *) el->data;
        if (e->knot == knot) {
            if (e->knot_click) {
                e->knot_click(item, state);
            }
            break;
        }
    }

    if (SP_IS_SHAPE(item)) {
        sp_shape_set_shape(SP_SHAPE(item));
    }

    knotholder_update_knots(knot_holder, item);

    // for drag, this is done by ungrabbed_handler, but for click we must do it here
    sp_document_done(SP_OBJECT_DOCUMENT(knot_holder->item)); 
}

static void knot_moved_handler(SPKnot *knot, NR::Point const *p, guint state, gpointer data)
{
    SPKnotHolder *knot_holder = (SPKnotHolder *) data;
    SPItem *item  = SP_ITEM (knot_holder->item);
    // this was a local change and the knotholder does not need to be recreated:
    knot_holder->local_change = TRUE; 
    
    for (GSList *el = knot_holder->entity; el; el = el->next) {
        SPKnotHolderEntity *e = (SPKnotHolderEntity *) el->data;
        if (e->knot == knot) {
            NR::Point const q = *p / sp_item_i2d_affine(item);
            e->knot_set(item, q, e->knot->drag_origin / sp_item_i2d_affine(item), state);
            break;
        }
    }

    if (SP_IS_SHAPE (item)) {
        sp_shape_set_shape(SP_SHAPE (item));
    }

    knotholder_update_knots(knot_holder, item);
}

static void knot_ungrabbed_handler(SPKnot *knot, unsigned int state, SPKnotHolder *kh)
{
    if (kh->released) {
        kh->released(kh->item);
    } else {
        SPObject *object = (SPObject *) kh->item;
        object->updateRepr(object->repr, SP_OBJECT_WRITE_EXT);
        sp_document_done(SP_OBJECT_DOCUMENT (object));
    }
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :

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