/*
 * Mesh drawing and editing tool
 *
 * Authors:
 *   bulia byak <buliabyak@users.sf.net>
 *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
 *   Abhishek Sharma
 *   Tavmjong Bah <tavmjong@free.fr>
 *
 * Copyright (C) 2012 Tavmjong Bah
 * Copyright (C) 2007 Johan Engelen
 * Copyright (C) 2005 Authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

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

//#define DEBUG_MESH


// Libraries
#include <gdk/gdkkeysyms.h>
#include <glibmm/i18n.h>

// General
#include "desktop.h"
#include "desktop-handles.h"
#include "document.h"
#include "document-undo.h"
#include "macros.h"
#include "message-context.h"
#include "message-stack.h"
#include "preferences.h"
#include "rubberband.h"
#include "selection.h"
#include "snap.h"
#include "sp-namedview.h"
#include "verbs.h"

// Gradient specific
#include "gradient-drag.h"
#include "gradient-chemistry.h"
#include "pixmaps/cursor-gradient.xpm"
#include "pixmaps/cursor-gradient-add.xpm"

// Mesh specific
#include "mesh-context.h"
#include "sp-mesh-gradient.h"
#include "display/sp-ctrlcurve.h"

using Inkscape::DocumentUndo;

static void sp_mesh_context_dispose(GObject *object);

static void sp_mesh_context_setup(SPEventContext *ec);

static gint sp_mesh_context_root_handler(SPEventContext *event_context, GdkEvent *event);

static void sp_mesh_drag(SPMeshContext &rc, Geom::Point const pt, guint state, guint32 etime);

G_DEFINE_TYPE(SPMeshContext, sp_mesh_context, SP_TYPE_EVENT_CONTEXT);

static void sp_mesh_context_class_init(SPMeshContextClass *klass)
{
    GObjectClass *object_class = (GObjectClass *) klass;
    SPEventContextClass *event_context_class = (SPEventContextClass *) klass;

    object_class->dispose = sp_mesh_context_dispose;

    event_context_class->setup = sp_mesh_context_setup;
    event_context_class->root_handler  = sp_mesh_context_root_handler;
}

static void sp_mesh_context_init(SPMeshContext *gr_context)
{
    SPEventContext *event_context = SP_EVENT_CONTEXT(gr_context);

    gr_context->cursor_addnode = false;
    event_context->cursor_shape = cursor_gradient_xpm;
    event_context->hot_x = 4;
    event_context->hot_y = 4;
    event_context->xp = 0;
    event_context->yp = 0;
    event_context->tolerance = 6;
    event_context->within_tolerance = false;
    event_context->item_to_select = NULL;
}

static void sp_mesh_context_dispose(GObject *object)
{
    SPMeshContext *rc = SP_MESH_CONTEXT(object);
    SPEventContext *ec = SP_EVENT_CONTEXT(object);

    ec->enableGrDrag(false);

    if (rc->_message_context) {
        delete rc->_message_context;
    }

    rc->selcon->disconnect();
    delete rc->selcon;
    rc->subselcon->disconnect();
    delete rc->subselcon;

    G_OBJECT_CLASS(sp_mesh_context_parent_class)->dispose(object);
}

const gchar *ms_handle_descr [] = {
    N_("Mesh gradient <b>corner</b>"),
    N_("Mesh gradient <b>handle</b>"),
    N_("Mesh gradient <b>tensor</b>")
};

static void
mesh_selection_changed (Inkscape::Selection *, gpointer data)
{
    SPMeshContext *rc = (SPMeshContext *) data;

    GrDrag *drag = rc->_grdrag;
    Inkscape::Selection *selection = sp_desktop_selection(SP_EVENT_CONTEXT(rc)->desktop);
    if (selection == NULL) {
        return;
    }
    guint n_obj = g_slist_length((GSList *) selection->itemList());

    if (!drag->isNonEmpty() || selection->isEmpty())
        return;
    guint n_tot = drag->numDraggers();
    guint n_sel = drag->numSelected();

    //The use of ngettext in the following code is intentional even if the English singular form would never be used
    if (n_sel == 1) {
        if (drag->singleSelectedDraggerNumDraggables() == 1) {
            gchar * message = g_strconcat(
                //TRANSLATORS: %s will be substituted with the point name (see previous messages); This is part of a compound message
                _("%s selected"),
                //TRANSLATORS: Mind the space in front. This is part of a compound message
                ngettext(" out of %d mesh handle"," out of %d mesh handles",n_tot),
                ngettext(" on %d selected object"," on %d selected objects",n_obj),NULL);
            rc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
                                       message,_(ms_handle_descr[drag->singleSelectedDraggerSingleDraggableType()]), n_tot, n_obj);
        } else {
            gchar * message =
                g_strconcat(
                    //TRANSLATORS: This is a part of a compound message (out of two more indicating: grandint handle count & object count)
                    ngettext("One handle merging %d stop (drag with <b>Shift</b> to separate) selected",
                             "One handle merging %d stops (drag with <b>Shift</b> to separate) selected",
                             drag->singleSelectedDraggerNumDraggables()),
                    ngettext(" out of %d mesh handle"," out of %d mesh handles",n_tot),
                    ngettext(" on %d selected object"," on %d selected objects",n_obj),NULL);
            rc->_message_context->setF(Inkscape::NORMAL_MESSAGE,message,drag->singleSelectedDraggerNumDraggables(), n_tot, n_obj);
        }
    } else if (n_sel > 1) {
        //TRANSLATORS: The plural refers to number of selected mesh handles. This is part of a compound message (part two indicates selected object count)
        gchar * message =
            g_strconcat(ngettext("<b>%d</b> mesh handle selected out of %d","<b>%d</b> mesh handles selected out of %d",n_sel),
                        //TRANSLATORS: Mind the space in front. (Refers to gradient handles selected). This is part of a compound message
                        ngettext(" on %d selected object"," on %d selected objects",n_obj),NULL);
        rc->_message_context->setF(Inkscape::NORMAL_MESSAGE,message, n_sel, n_tot, n_obj);
    } else if (n_sel == 0) {
        rc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
                                   //TRANSLATORS: The plural refers to number of selected objects
                                   ngettext("<b>No</b> mesh handles selected out of %d on %d selected object",
                                            "<b>No</b> mesh handles selected out of %d on %d selected objects",n_obj), n_tot, n_obj);
    }

    // FIXME
    // We need to update mesh gradient handles.
    // Get gradient this drag belongs too..
    // std::cout << "mesh_selection_changed: selection: objects: " << n_obj << std::endl;
    // GSList *itemList = (GSList *) selection->itemList();
    // while( itemList ) {

    //     SPItem *item = SP_ITEM( itemList->data );
    //     // std::cout << "  item: " << SP_OBJECT(item)->getId() << std::endl;

    //     SPStyle *style = item->style;
    //     if (style && (style->fill.isPaintserver())) {

    //         SPPaintServer *server = item->style->getFillPaintServer();
    //         if ( SP_IS_MESHGRADIENT(server) ) {

    //             SPMeshGradient *mg = SP_MESHGRADIENT(server);

    //             guint rows    = 0;//mg->array.patches.size();
    //             for ( guint i = 0; i < rows; ++i ) {
    //                 guint columns = 0;//mg->array.patches[0].size();
    //                 for ( guint j = 0; j < columns; ++j ) {
    //                 }
    //             }
    //         }
    //     }
    //     itemList = itemList->next;
    // }

    // GList* dragger_ptr = drag->draggers;  // Points to GrDragger class (group of GrDraggable)
    // guint count = 0;
    // while( dragger_ptr ) {

    //     std::cout << "mesh_selection_changed: dragger: " << ++count << std::endl;
    //     GSList* draggable_ptr = ((GrDragger *) dragger_ptr->data)->draggables;

    //     while( draggable_ptr ) {

    //         std::cout << "mesh_selection_changed:  draggable: " << draggable_ptr << std::endl;
    //         GrDraggable *draggable = (GrDraggable *) draggable_ptr->data;

    //         gint point_type     = draggable->point_type;
    //         gint point_i        = draggable->point_i;
    //         bool fill_or_stroke = draggable->fill_or_stroke;

    //         if( point_type == POINT_MG_CORNER ) {

    //             //std::cout << "mesh_selection_changed:   POINT_MG_CORNER: " << point_i << std::endl;
    //             // Now we must create or destroy corresponding handles.

    //             if( g_list_find( drag->selected, dragger_ptr->data ) ) {
    //                 //std::cout << "gradient_selection_changed:    Selected: " << point_i << std::endl;
    //                 // Which meshes does this point belong to?

    //             } else {
    //                 //std::cout << "mesh_selection_changed:    Not Selected: " << point_i << std::endl;
    //             }
    //         }

    //         draggable_ptr = draggable_ptr->next;

    //     }

    //     dragger_ptr = dragger_ptr->next;
    // }
}


static void
mesh_subselection_changed (gpointer, gpointer data)
{
    mesh_selection_changed (NULL, data);
}


static void sp_mesh_context_setup(SPEventContext *ec)
{
    SPMeshContext *rc = SP_MESH_CONTEXT(ec);

    if (((SPEventContextClass *) sp_mesh_context_parent_class)->setup) {
        ((SPEventContextClass *) sp_mesh_context_parent_class)->setup(ec);
    }

    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    if (prefs->getBool("/tools/mesh/selcue", true)) {
        ec->enableSelectionCue();
    }

    ec->enableGrDrag();
    Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);

    rc->_message_context = new Inkscape::MessageContext(sp_desktop_message_stack(ec->desktop));

    rc->selcon = new sigc::connection (selection->connectChanged( sigc::bind (sigc::ptr_fun(&mesh_selection_changed), rc)));
    rc->subselcon = new sigc::connection (ec->desktop->connectToolSubselectionChanged(sigc::bind (sigc::ptr_fun(&mesh_subselection_changed), rc)));
    mesh_selection_changed(selection, rc);
}

void
sp_mesh_context_select_next (SPEventContext *event_context)
{
    GrDrag *drag = event_context->_grdrag;
    g_assert (drag);

    GrDragger *d = drag->select_next();

    event_context->desktop->scroll_to_point(d->point, 1.0);
}

void
sp_mesh_context_select_prev (SPEventContext *event_context)
{
    GrDrag *drag = event_context->_grdrag;
    g_assert (drag);

    GrDragger *d = drag->select_prev();

    event_context->desktop->scroll_to_point(d->point, 1.0);
}

/**
Returns true if mouse cursor over mesh edge.
*/
static bool
sp_mesh_context_is_over_line (SPMeshContext *rc, SPItem *item, Geom::Point event_p)
{
    SPDesktop *desktop = SP_EVENT_CONTEXT (rc)->desktop;

    //Translate mouse point into proper coord system
    rc->mousepoint_doc = desktop->w2d(event_p);

    SPCtrlCurve *curve = SP_CTRLCURVE(item);
    Geom::BezierCurveN<3> b( curve->p0, curve->p1, curve->p2, curve->p3 );
    Geom::Coord coord = b.nearestPoint( rc->mousepoint_doc ); // Coord == double
    Geom::Point nearest = b( coord );

    double dist_screen = Geom::L2 (rc->mousepoint_doc - nearest) * desktop->current_zoom();

    double tolerance = (double) SP_EVENT_CONTEXT(rc)->tolerance;

    bool close = (dist_screen < tolerance);

    return close;
}


/**
Split row/column near the mouse point.
*/
static void sp_mesh_context_split_near_point(SPMeshContext *rc, SPItem *item,  Geom::Point mouse_p, guint32 /*etime*/)
{

#ifdef DEBUG_MESH
    std::cout << "sp_mesh_context_split_near_point: entrance: " << mouse_p << std::endl;
#endif

    // item is the selected item. mouse_p the location in doc coordinates of where to add the stop

    SPEventContext *ec = SP_EVENT_CONTEXT(rc);
    SPDesktop *desktop = SP_EVENT_CONTEXT (rc)->desktop;

    double tolerance = (double) ec->tolerance;

    ec->get_drag()->addStopNearPoint (item, mouse_p, tolerance/desktop->current_zoom());

    DocumentUndo::done(sp_desktop_document (desktop), SP_VERB_CONTEXT_MESH,
                       _("Split mesh row/column"));

    ec->get_drag()->updateDraggers();
}

/**
Wrapper for various mesh operations that require a list of selected corner nodes.
 */
static void
sp_mesh_context_corner_operation (SPMeshContext *rc, MeshCornerOperation operation )
{

#ifdef DEBUG_MESH
    std::cout << "sp_mesh_corner_operation: entrance: " << operation << std::endl;
#endif

    SPDocument *doc = NULL;
    GrDrag *drag = rc->_grdrag;

    std::map<SPMeshGradient*, std::vector<guint> > points;
    std::map<SPMeshGradient*, SPItem*> items;
 
    // Get list of selected draggers for each mesh.
    // For all selected draggers
    for (GList *i = drag->selected; i != NULL; i = i->next) {
        GrDragger *dragger = (GrDragger *) i->data;
        // For all draggables of dragger
        for (GSList const* j = dragger->draggables; j != NULL; j = j->next) {
            GrDraggable *d = (GrDraggable *) j->data;

            // Only mesh corners
            if( d->point_type != POINT_MG_CORNER ) continue;

            // Find the gradient
            SPMeshGradient *gradient = SP_MESHGRADIENT( getGradient (d->item, d->fill_or_stroke) );

            // Collect points together for same gradient
            points[gradient].push_back( d->point_i );
            items[gradient] = d->item;
        }
    }

    // Loop over meshes.
    for( std::map<SPMeshGradient*, std::vector<guint> >::const_iterator iter = points.begin(); iter != points.end(); ++iter) {
        SPMeshGradient *mg = SP_MESHGRADIENT( iter->first );
        if( iter->second.size() > 0 ) {
            guint noperation = 0;
            switch (operation) {

                case MG_CORNER_SIDE_TOGGLE:
                    // std::cout << "SIDE_TOGGLE" << std::endl;
                    noperation += mg->array.side_toggle( iter->second );
                    break;

                case MG_CORNER_SIDE_ARC:
                    // std::cout << "SIDE_ARC" << std::endl;
                    noperation += mg->array.side_arc( iter->second );
                    break;

                case MG_CORNER_TENSOR_TOGGLE:
                    // std::cout << "TENSOR_TOGGLE" << std::endl;
                    noperation += mg->array.tensor_toggle( iter->second );
                    break;

                case MG_CORNER_COLOR_SMOOTH:
                    // std::cout << "COLOR_SMOOTH" << std::endl;
                    noperation += mg->array.color_smooth( iter->second );
                    break;

                case MG_CORNER_COLOR_PICK:
                    // std::cout << "COLOR_PICK" << std::endl;
                    noperation += mg->array.color_pick( iter->second, items[iter->first] );
                    break;

                default:
                    std::cout << "sp_mesh_corner_operation: unknown operation" << std::endl;
            }                    

            if( noperation > 0 ) {
                mg->array.write( mg );
                mg->requestModified(SP_OBJECT_MODIFIED_FLAG);
                doc = mg->document;

                switch (operation) {

                    case MG_CORNER_SIDE_TOGGLE:
                        DocumentUndo::done(doc, SP_VERB_CONTEXT_MESH, _("Toggled mesh path type."));
                        break;

                    case MG_CORNER_SIDE_ARC:
                        DocumentUndo::done(doc, SP_VERB_CONTEXT_MESH, _("Approximated arc for mesh side."));
                        break;

                    case MG_CORNER_TENSOR_TOGGLE:
                        DocumentUndo::done(doc, SP_VERB_CONTEXT_MESH, _("Toggled mesh tensors."));
                        break;

                    case MG_CORNER_COLOR_SMOOTH:
                        DocumentUndo::done(doc, SP_VERB_CONTEXT_MESH, _("Smoothed mesh corner color."));
                        break;

                    case MG_CORNER_COLOR_PICK:
                        DocumentUndo::done(doc, SP_VERB_CONTEXT_MESH, _("Picked mesh corner color."));
                        break;

                    default:
                        std::cout << "sp_mesh_corner_operation: unknown operation" << std::endl;
                }
            }
        }
    }
    drag->updateDraggers();

}


/**
Handles all keyboard and mouse input for meshs.
*/
static gint
sp_mesh_context_root_handler(SPEventContext *event_context, GdkEvent *event)
{
    // static int count = 0;
    // std::cout << "sp_mesh_context_root_handler: " << count++ << std::endl;
    static bool dragging;

    SPDesktop *desktop = event_context->desktop;
    Inkscape::Selection *selection = sp_desktop_selection (desktop);
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();

    SPMeshContext *rc = SP_MESH_CONTEXT(event_context);

    event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
    double const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000, "px"); // in px

    GrDrag *drag = event_context->_grdrag;
    g_assert (drag);

    gint ret = FALSE;
    switch (event->type) {

    case GDK_2BUTTON_PRESS:

#ifdef DEBUG_MESH
        std::cout << "sp_mesh_context_root_handler: GDK_2BUTTON_PRESS" << std::endl;
#endif

        // Double click:
        //  If over a mesh line, divide mesh row/column
        //  If not over a line, create new gradients for selected objects.

        if ( event->button.button == 1 ) {

            // Are we over a mesh line?
            bool over_line = false;
            SPCtrlCurve *line = NULL;
            if (drag->lines) {
                for (GSList *l = drag->lines; (l != NULL) && (!over_line); l = l->next) {
                    line = (SPCtrlCurve*) l->data;
                    over_line |= sp_mesh_context_is_over_line (rc, (SPItem*) line, Geom::Point(event->motion.x, event->motion.y));
                }
            }

            if (over_line) {
                // We take the first item in selection, because with doubleclick, the first click
                // always resets selection to the single object under cursor
                sp_mesh_context_split_near_point(rc, SP_ITEM(selection->itemList()->data), rc->mousepoint_doc, event->button.time);

            } else {
                // Create a new gradient with default coordinates.

                for (GSList const* i = selection->itemList(); i != NULL; i = i->next) {

                    SPItem *item = SP_ITEM(i->data);
                    SPGradientType new_type = SP_GRADIENT_TYPE_MESH;
                    Inkscape::PaintTarget fsmode = (prefs->getInt("/tools/gradient/newfillorstroke", 1) != 0) ? Inkscape::FOR_FILL : Inkscape::FOR_STROKE;

#ifdef DEBUG_MESH
                    std::cout << "sp_mesh_context_root_handler: creating new mesh on: " << (fsmode == Inkscape::FOR_FILL ? "Fill" : "Stroke") << std::endl;
#endif
                    SPGradient *vector = sp_gradient_vector_for_object(sp_desktop_document(desktop), desktop, item, fsmode);

                    SPGradient *priv = sp_item_set_gradient(item, vector, new_type, fsmode);
                    sp_gradient_reset_to_userspace(priv, item);
                }

                DocumentUndo::done(sp_desktop_document (desktop), SP_VERB_CONTEXT_MESH,
                                   _("Create default mesh"));
            }
            ret = TRUE;
        }
        break;

    case GDK_BUTTON_PRESS:

#ifdef DEBUG_MESH
        std::cout << "sp_mesh_context_root_handler: GDK_BUTTON_PRESS" << std::endl;
#endif
        // Button down
        //  If Shift key down: do rubber band selection
        //  Else set origin for drag. A drag creates a new gradient if one does not exist
 
        if ( event->button.button == 1 && !event_context->space_panning ) {
            Geom::Point button_w(event->button.x, event->button.y);

            // save drag origin
            event_context->xp = (gint) button_w[Geom::X];
            event_context->yp = (gint) button_w[Geom::Y];
            event_context->within_tolerance = true;

            dragging = true;

            Geom::Point button_dt = desktop->w2d(button_w);
            if (event->button.state & GDK_SHIFT_MASK) {
                Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);
            } else {
                // remember clicked item, disregarding groups, honoring Alt; do nothing with Crtl to
                // enable Ctrl+doubleclick of exactly the selected item(s)
                if (!(event->button.state & GDK_CONTROL_MASK))
                    event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);

                if (!selection->isEmpty()) {
                    SnapManager &m = desktop->namedview->snap_manager;
                    m.setup(desktop);
                    m.freeSnapReturnByRef(button_dt, Inkscape::SNAPSOURCE_NODE_HANDLE);
                    m.unSetup();
                }
                rc->origin = button_dt;
            }

            ret = TRUE;
        }
        break;

    case GDK_MOTION_NOTIFY:

        // Mouse move

        if ( dragging
             && ( event->motion.state & GDK_BUTTON1_MASK ) && !event_context->space_panning )
        {
 
#ifdef DEBUG_MESH
            std::cout << "sp_mesh_context_root_handler: GDK_MOTION_NOTIFY: Dragging" << std::endl;
#endif
            if ( event_context->within_tolerance
                 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
                 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
                break; // do not drag if we're within tolerance from origin
            }
            // Once the user has moved farther than tolerance from the original location
            // (indicating they intend to draw, not click), then always process the
            // motion notify coordinates as given (no snapping back to origin)
            event_context->within_tolerance = false;

            Geom::Point const motion_w(event->motion.x,
                                     event->motion.y);
            Geom::Point const motion_dt = event_context->desktop->w2d(motion_w);

            if (Inkscape::Rubberband::get(desktop)->is_started()) {
                Inkscape::Rubberband::get(desktop)->move(motion_dt);
                event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw around</b> handles to select them"));
            } else {
                // Create new gradient with coordinates determined by drag.
                sp_mesh_drag(*rc, motion_dt, event->motion.state, event->motion.time);
            }
            gobble_motion_events(GDK_BUTTON1_MASK);

            ret = TRUE;

        } else {
            // Not dragging

            // Do snapping
            if (!drag->mouseOver() && !selection->isEmpty()) {
                SnapManager &m = desktop->namedview->snap_manager;
                m.setup(desktop);

                Geom::Point const motion_w(event->motion.x, event->motion.y);
                Geom::Point const motion_dt = event_context->desktop->w2d(motion_w);

                m.preSnap(Inkscape::SnapCandidatePoint(motion_dt, Inkscape::SNAPSOURCE_OTHER_HANDLE));
                m.unSetup();
            }

            // Highlight corner node corresponding to side or tensor node
            if( drag->mouseOver() ) {
                // MESH FIXME: Light up corresponding corner node corresponding to node we are over.
                // See "pathflash" in ui/tools/node-tool.cpp for ideas.
                // Use desktop->add_temporary_canvasitem( SPCanvasItem, milliseconds );
            }

            // Change cursor shape if over line
            bool over_line = false;
            if (drag->lines) {
                for (GSList *l = drag->lines; l != NULL; l = l->next) {
                    over_line |= sp_mesh_context_is_over_line (rc, (SPItem*) l->data, Geom::Point(event->motion.x, event->motion.y));
                }
            }

            if (rc->cursor_addnode && !over_line) {
                event_context->cursor_shape = cursor_gradient_xpm;
                sp_event_context_update_cursor(event_context);
                rc->cursor_addnode = false;
            } else if (!rc->cursor_addnode && over_line) {
                event_context->cursor_shape = cursor_gradient_add_xpm;
                sp_event_context_update_cursor(event_context);
                rc->cursor_addnode = true;
            }
        }
        break;

    case GDK_BUTTON_RELEASE:

#ifdef DEBUG_MESH
        std::cout << "sp_mesh_context_root_handler: GDK_BUTTON_RELEASE" << std::endl;
#endif

        event_context->xp = event_context->yp = 0;
        if ( event->button.button == 1 && !event_context->space_panning ) {

            // Check if over line
            bool over_line = false;
            SPCtrlLine *line = NULL;
            if (drag->lines) {
                for (GSList *l = drag->lines; (l != NULL) && (!over_line); l = l->next) {
                    line = (SPCtrlLine*) l->data;
                    over_line = sp_mesh_context_is_over_line (rc, (SPItem*) line, Geom::Point(event->motion.x, event->motion.y));
                    if (over_line)
                        break;
                }
            }

            if ( (event->button.state & GDK_CONTROL_MASK) && (event->button.state & GDK_MOD1_MASK ) ) {
                if (over_line && line) {
                    sp_mesh_context_split_near_point(rc, line->item, rc->mousepoint_doc, 0);
                    ret = TRUE;
                }

            } else {

                dragging = false;

                // unless clicked with Ctrl (to enable Ctrl+doubleclick).
                if (event->button.state & GDK_CONTROL_MASK) {
                    ret = TRUE;
                    break;
                }

                if (!event_context->within_tolerance) {
                    // we've been dragging, either do nothing (grdrag handles that),
                    // or rubberband-select if we have rubberband
                    Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
                    if (r->is_started() && !event_context->within_tolerance) {
                        // this was a rubberband drag
                        if (r->getMode() == RUBBERBAND_MODE_RECT) {
                            Geom::OptRect const b = r->getRectangle();
                            drag->selectRect(*b);
                        }
                    }

                } else if (event_context->item_to_select) {
                    if (over_line && line) {
                        // Clicked on an existing mesh line, don't change selection. This stops
                        // possible change in selection during a double click with overlapping objects
                    }
                    else {
                        // no dragging, select clicked item if any
                        if (event->button.state & GDK_SHIFT_MASK) {
                            selection->toggle(event_context->item_to_select);
                        } else {
                            selection->set(event_context->item_to_select);
                        }
                    }
                } else {
                    // click in an empty space; do the same as Esc
                    if (drag->selected) {
                        drag->deselectAll();
                    } else {
                        selection->clear();
                    }
                }

                event_context->item_to_select = NULL;
                ret = TRUE;
            }
            Inkscape::Rubberband::get(desktop)->stop();
        }
        break;

    case GDK_KEY_PRESS:

#ifdef DEBUG_MESH
        std::cout << "sp_mesh_context_root_handler: GDK_KEY_PRESS" << std::endl;
#endif

        // FIXME: tip
        switch (get_group0_keyval (&event->key)) {
        case GDK_KEY_Alt_L:
        case GDK_KEY_Alt_R:
        case GDK_KEY_Control_L:
        case GDK_KEY_Control_R:
        case GDK_KEY_Shift_L:
        case GDK_KEY_Shift_R:
        case GDK_KEY_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
        case GDK_KEY_Meta_R:
            sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
                                        _("FIXME<b>Ctrl</b>: snap mesh angle"),
                                        _("FIXME<b>Shift</b>: draw mesh around the starting point"),
                                        NULL);
            break;

        case GDK_KEY_A:
        case GDK_KEY_a:
            if (MOD__CTRL_ONLY && drag->isNonEmpty()) {
                drag->selectAll();
                ret = TRUE;
            }
            break;

        case GDK_KEY_Escape:
            if (drag->selected) {
                drag->deselectAll();
            } else {
                selection->clear();
            }
            ret = TRUE;
            //TODO: make dragging escapable by Esc
            break;

        case GDK_KEY_Left: // move handle left
        case GDK_KEY_KP_Left:
        case GDK_KEY_KP_4:
            if (!MOD__CTRL) { // not ctrl
                gint mul = 1 + gobble_key_events(
                    get_group0_keyval(&event->key), 0); // with any mask
                if (MOD__ALT) { // alt
                    if (MOD__SHIFT) drag->selected_move_screen(mul*-10, 0); // shift
                    else drag->selected_move_screen(mul*-1, 0); // no shift
                }
                else { // no alt
                    if (MOD__SHIFT) drag->selected_move(mul*-10*nudge, 0); // shift
                    else drag->selected_move(mul*-nudge, 0); // no shift
                }
                ret = TRUE;
            }
            break;
        case GDK_KEY_Up: // move handle up
        case GDK_KEY_KP_Up:
        case GDK_KEY_KP_8:
            if (!MOD__CTRL) { // not ctrl
                gint mul = 1 + gobble_key_events(
                    get_group0_keyval(&event->key), 0); // with any mask
                if (MOD__ALT) { // alt
                    if (MOD__SHIFT) drag->selected_move_screen(0, mul*10); // shift
                    else drag->selected_move_screen(0, mul*1); // no shift
                }
                else { // no alt
                    if (MOD__SHIFT) drag->selected_move(0, mul*10*nudge); // shift
                    else drag->selected_move(0, mul*nudge); // no shift
                }
                ret = TRUE;
            }
            break;

        case GDK_KEY_Right: // move handle right
        case GDK_KEY_KP_Right:
        case GDK_KEY_KP_6:
            if (!MOD__CTRL) { // not ctrl
                gint mul = 1 + gobble_key_events(
                    get_group0_keyval(&event->key), 0); // with any mask
                if (MOD__ALT) { // alt
                    if (MOD__SHIFT) drag->selected_move_screen(mul*10, 0); // shift
                    else drag->selected_move_screen(mul*1, 0); // no shift
                }
                else { // no alt
                    if (MOD__SHIFT) drag->selected_move(mul*10*nudge, 0); // shift
                    else drag->selected_move(mul*nudge, 0); // no shift
                }
                ret = TRUE;
            }
            break;

        case GDK_KEY_Down: // move handle down
        case GDK_KEY_KP_Down:
        case GDK_KEY_KP_2:
            if (!MOD__CTRL) { // not ctrl
                gint mul = 1 + gobble_key_events(
                    get_group0_keyval(&event->key), 0); // with any mask
                if (MOD__ALT) { // alt
                    if (MOD__SHIFT) drag->selected_move_screen(0, mul*-10); // shift
                    else drag->selected_move_screen(0, mul*-1); // no shift
                }
                else { // no alt
                    if (MOD__SHIFT) drag->selected_move(0, mul*-10*nudge); // shift
                    else drag->selected_move(0, mul*-nudge); // no shift
                }
                ret = TRUE;
            }
            break;

        case GDK_KEY_Insert:
        case GDK_KEY_KP_Insert:
            // with any modifiers:
            //sp_gradient_context_add_stops_between_selected_stops (rc);
            std::cout << "Inserting stops between selected stops not implemented yet" << std::endl;
            ret = TRUE;
            break;

        case GDK_KEY_Delete:
        case GDK_KEY_KP_Delete:
        case GDK_KEY_BackSpace:
            if ( drag->selected ) {
                std::cout << "Deleting mesh stops not implemented yet" << std::endl;
                ret = TRUE;
            }
            break;

        // Mesh Operations --------------------------------------------

        case GDK_KEY_b:  // Toggle mesh side between lineto and curveto.
        case GDK_KEY_B: 
            if (MOD__ALT && drag->isNonEmpty() && drag->hasSelection()) {
                sp_mesh_context_corner_operation ( rc, MG_CORNER_SIDE_TOGGLE );
                ret = TRUE;
            }
            break;

        case GDK_KEY_c:  // Convert mesh side from generic Bezier to Bezier approximating arc,
        case GDK_KEY_C:  // preserving handle direction.
            if (MOD__ALT && drag->isNonEmpty() && drag->hasSelection()) {
                sp_mesh_context_corner_operation ( rc, MG_CORNER_SIDE_ARC );
                ret = TRUE;
            }
            break;

        case GDK_KEY_g:  // Toggle mesh tensor points on/off
        case GDK_KEY_G: 
            if (MOD__ALT && drag->isNonEmpty() && drag->hasSelection()) {
                sp_mesh_context_corner_operation ( rc, MG_CORNER_TENSOR_TOGGLE );
                ret = TRUE;
            }
            break;

        case GDK_KEY_j:  // Smooth corner color
        case GDK_KEY_J:
            if (MOD__ALT && drag->isNonEmpty() && drag->hasSelection()) {
                sp_mesh_context_corner_operation ( rc, MG_CORNER_COLOR_SMOOTH );
                ret = TRUE;
            }
            break;

        case GDK_KEY_k:  // Pick corner color
        case GDK_KEY_K:
            if (MOD__ALT && drag->isNonEmpty() && drag->hasSelection()) {
                sp_mesh_context_corner_operation ( rc, MG_CORNER_COLOR_PICK );
                ret = TRUE;
            }
            break;

        default:
            break;
        }

        break;

    case GDK_KEY_RELEASE:

#ifdef DEBUG_MESH
        std::cout << "sp_mesh_context_root_handler: GDK_KEY_RELEASE" << std::endl;
#endif
        switch (get_group0_keyval (&event->key)) {
        case GDK_KEY_Alt_L:
        case GDK_KEY_Alt_R:
        case GDK_KEY_Control_L:
        case GDK_KEY_Control_R:
        case GDK_KEY_Shift_L:
        case GDK_KEY_Shift_R:
        case GDK_KEY_Meta_L:  // Meta is when you press Shift+Alt
        case GDK_KEY_Meta_R:
            event_context->defaultMessageContext()->clear();
            break;
        default:
            break;
        }
        break;
    default:
        break;
    }

    if (!ret) {
        if (((SPEventContextClass *) sp_mesh_context_parent_class)->root_handler) {
            ret = ((SPEventContextClass *) sp_mesh_context_parent_class)->root_handler(event_context, event);
        }
    }

    return ret;
}


static void sp_mesh_drag(SPMeshContext &rc, Geom::Point const /*pt*/, guint /*state*/, guint32 /*etime*/)
{

    SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
    Inkscape::Selection *selection = sp_desktop_selection(desktop);
    SPDocument *document = sp_desktop_document(desktop);
    SPEventContext *ec = SP_EVENT_CONTEXT(&rc);

    if (!selection->isEmpty()) {

        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
        int type = SP_GRADIENT_TYPE_MESH;
        Inkscape::PaintTarget fill_or_stroke = (prefs->getInt("/tools/gradient/newfillorstroke", 1) != 0) ? Inkscape::FOR_FILL : Inkscape::FOR_STROKE;

        SPGradient *vector;
        if (ec->item_to_select) {
            // pick color from the object where drag started
            vector = sp_gradient_vector_for_object(document, desktop, ec->item_to_select, fill_or_stroke);
        } else {
            // Starting from empty space:
            // Sort items so that the topmost comes last
            GSList *items = g_slist_copy ((GSList *) selection->itemList());
            items = g_slist_sort(items, (GCompareFunc) sp_item_repr_compare_position);
            // take topmost
            vector = sp_gradient_vector_for_object(document, desktop, SP_ITEM(g_slist_last(items)->data), fill_or_stroke);
            g_slist_free (items);
        }

        // HACK: reset fill-opacity - that 0.75 is annoying; BUT remove this when we have an opacity slider for all tabs
        SPCSSAttr *css = sp_repr_css_attr_new();
        sp_repr_css_set_property(css, "fill-opacity", "1.0");

        for (GSList const *i = selection->itemList(); i != NULL; i = i->next) {

            //FIXME: see above
            sp_repr_css_change_recursive(SP_OBJECT(i->data)->getRepr(), css, "style");

            sp_item_set_gradient(SP_ITEM(i->data), vector, (SPGradientType) type, fill_or_stroke);

            // We don't need to do anything. Mesh is already sized appropriately.
 
            SP_OBJECT(i->data)->requestModified(SP_OBJECT_MODIFIED_FLAG);
        }
        // if (ec->_grdrag) {
        //     ec->_grdrag->updateDraggers();
        //     // prevent regenerating draggers by selection modified signal, which sometimes
        //     // comes too late and thus destroys the knot which we will now grab:
        //     ec->_grdrag->local_change = true;
        //     // give the grab out-of-bounds values of xp/yp because we're already dragging
        //     // and therefore are already out of tolerance
        //     ec->_grdrag->grabKnot (SP_ITEM(selection->itemList()->data),
        //                            type == SP_GRADIENT_TYPE_LINEAR? POINT_LG_END : POINT_RG_R1,
        //                            -1, // ignore number (though it is always 1)
        //                            fill_or_stroke, 99999, 99999, etime);
        // }
        // We did an undoable action, but SPDocumentUndo::done will be called by the knot when released

        // status text; we do not track coords because this branch is run once, not all the time
        // during drag
        int n_objects = g_slist_length((GSList *) selection->itemList());
        rc._message_context->setF(Inkscape::NORMAL_MESSAGE,
                                  ngettext("<b>Gradient</b> for %d object; with <b>Ctrl</b> to snap angle",
                                           "<b>Gradient</b> for %d objects; with <b>Ctrl</b> to snap angle", n_objects),
                                  n_objects);
    } else {
        sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>objects</b> on which to create gradient."));
    }

}


/*
  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:fileencoding=utf-8:textwidth=99 :
