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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* A class to render the SVG drawing.
*/
/*
* Author:
* Tavmjong Bah
*
* Copyright (C) 2020 Tavmjong Bah
*
* Rewrite of _SPCanvasArena.
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "canvas-item-drawing.h"
#include "desktop.h"
#include "display/drawing.h"
#include "display/drawing-context.h"
#include "display/drawing-item.h"
#include "display/drawing-group.h"
#include "helper/geom.h"
#include "ui/widget/canvas.h"
#include "ui/modifiers.h"
namespace Inkscape {
/**
* Create the drawing. One per window!
*/
CanvasItemDrawing::CanvasItemDrawing(CanvasItemGroup *group)
: CanvasItem(group)
{
_name = "CanvasItemDrawing";
_pickable = true;
_drawing = std::make_unique<Drawing>(this);
auto root = new DrawingGroup(*_drawing);
root->setPickChildren(true);
_drawing->setRoot(root);
}
/**
* Returns true if point p (in canvas units) is inside some object in drawing.
*/
bool CanvasItemDrawing::contains(Geom::Point const &p, double tolerance)
{
if (tolerance != 0) {
std::cerr << "CanvasItemDrawing::contains: Non-zero tolerance not implemented!" << std::endl;
}
_picked_item = _drawing->pick(p, _drawing->cursorTolerance(), _sticky * DrawingItem::PICK_STICKY | _pick_outline * DrawingItem::PICK_OUTLINE);
if (_picked_item) {
// This will trigger a signal that is handled by our event handler. Seems a bit of a
// round-about way of doing things but it matches what other pickable canvas-item classes do.
return true;
}
return false;
}
/**
* Update and redraw drawing.
*/
void CanvasItemDrawing::_update(bool)
{
// Undo y-axis flip. This should not be here!!!!
auto new_drawing_affine = affine();
if (auto desktop = get_canvas()->get_desktop()) {
new_drawing_affine = desktop->doc2dt() * new_drawing_affine;
}
bool affine_changed = _drawing_affine != new_drawing_affine;
if (affine_changed) {
_drawing_affine = new_drawing_affine;
}
_drawing->update(Geom::IntRect::infinite(), _drawing_affine, DrawingItem::STATE_ALL, affine_changed * DrawingItem::STATE_ALL);
_bounds = expandedBy(_drawing->root()->drawbox(), 1); // Avoid aliasing artifacts
// Todo: This should be managed elsewhere.
if (_cursor) {
/* Mess with enter/leave notifiers */
DrawingItem *new_drawing_item = _drawing->pick(_c, _delta, _sticky * DrawingItem::PICK_STICKY | _pick_outline * DrawingItem::PICK_OUTLINE);
if (_active_item != new_drawing_item) {
GdkEventCrossing ec;
ec.window = get_canvas()->get_window()->gobj();
ec.send_event = true;
ec.subwindow = ec.window;
ec.time = GDK_CURRENT_TIME;
ec.x = _c.x();
ec.y = _c.y();
/* fixme: Why? */
if (_active_item) {
ec.type = GDK_LEAVE_NOTIFY;
_drawing_event_signal.emit((GdkEvent *) &ec, _active_item);
}
_active_item = new_drawing_item;
if (_active_item) {
ec.type = GDK_ENTER_NOTIFY;
_drawing_event_signal.emit((GdkEvent *) &ec, _active_item);
}
}
}
}
/**
* Render drawing to screen via Cairo.
*/
void CanvasItemDrawing::_render(Inkscape::CanvasItemBuffer &buf) const
{
auto dc = Inkscape::DrawingContext(buf.cr->cobj(), buf.rect.min());
_drawing->render(dc, buf.rect, buf.outline_pass * DrawingItem::RENDER_OUTLINE);
}
/**
* Handle events directed at the drawing. We first attempt to handle them here.
*/
bool CanvasItemDrawing::handle_event(GdkEvent *event)
{
bool retval = false;
switch (event->type) {
case GDK_ENTER_NOTIFY:
if (!_cursor) {
if (_active_item) {
std::cerr << "CanvasItemDrawing::event_handler: cursor entered drawing with an active item!" << std::endl;
}
_cursor = true;
/* TODO ... event -> arena transform? */
_c = Geom::Point(event->crossing.x, event->crossing.y);
_active_item = _drawing->pick(_c, _drawing->cursorTolerance(), _sticky * DrawingItem::PICK_STICKY | _pick_outline * DrawingItem::PICK_OUTLINE);
retval = _drawing_event_signal.emit(event, _active_item);
}
break;
case GDK_LEAVE_NOTIFY:
if (_cursor) {
retval = _drawing_event_signal.emit(event, _active_item);
_active_item = nullptr;
_cursor = false;
}
break;
case GDK_MOTION_NOTIFY:
{
/* TODO ... event -> arena transform? */
_c = Geom::Point(event->motion.x, event->motion.y);
auto new_drawing_item = _drawing->pick(_c, _drawing->cursorTolerance(), _sticky * DrawingItem::PICK_STICKY | _pick_outline * DrawingItem::PICK_OUTLINE);
if (_active_item != new_drawing_item) {
GdkEventCrossing ec;
ec.window = event->motion.window;
ec.send_event = event->motion.send_event;
ec.subwindow = event->motion.window;
ec.time = event->motion.time;
ec.x = event->motion.x;
ec.y = event->motion.y;
/* fixme: What is wrong? */
if (_active_item) {
ec.type = GDK_LEAVE_NOTIFY;
retval = _drawing_event_signal.emit((GdkEvent *) &ec, _active_item);
}
_active_item = new_drawing_item;
if (_active_item) {
ec.type = GDK_ENTER_NOTIFY;
retval = _drawing_event_signal.emit((GdkEvent *) &ec, _active_item);
}
}
retval = retval || _drawing_event_signal.emit(event, _active_item);
break;
}
case GDK_SCROLL:
{
if (Modifiers::Modifier::get(Modifiers::Type::CANVAS_ZOOM)->active(event->scroll.state)) {
/* Zoom is emitted by the canvas as well, ignore here */
return false;
}
retval = _drawing_event_signal.emit(event, _active_item);
break;
}
default:
/* Just send event */
retval = _drawing_event_signal.emit(event, _active_item);
break;
}
return retval;
}
} // namespace Inkscape
/*
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 :
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