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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
* A light-weight widget containing an Inkscape canvas for rendering an SVG.
*/
/*
* Authors:
* Tavmjong Bah <tavmjong@free.fr>
*
* Includes code moved from svg-view.cpp authored by:
* MenTaLGuy
* Ralf Stephan <ralf@ark.in-berlin.de>
* Jon A. Cruz <jon@joncruz.org>
*
* Copyright (C) 2018 Authors
*
* The contents of this file may be used under the GNU General Public License Version 2 or later.
* Read the file 'COPYING' for more information.
*
*/
#include <iostream>
#include "svg-view-widget.h"
#include "document.h"
#include "2geom/transforms.h"
#include "display/drawing.h"
#include "display/control/canvas-item.h"
#include "display/control/canvas-item-drawing.h"
#include "display/control/canvas-item-group.h"
#include "object/sp-item.h"
#include "object/sp-root.h"
#include "ui/widget/canvas.h"
#include "util/units.h"
namespace Inkscape {
namespace UI {
namespace View {
/**
* Callback connected with drawing_event.
*/
// This hasn't worked since at least 0.48. It should result in a cursor change over <a></a> links.
// There should be a better way of doing this. See note in canvas-arena.cpp.
static bool _drawing_handler(GdkEvent *event, Inkscape::DrawingItem *drawing_item, SVGViewWidget *svgview)
{
static gdouble x, y;
static gboolean active = FALSE;
SPEvent spev;
SPItem *spitem = (drawing_item) ? drawing_item->getItem() : nullptr;
switch (event->type) {
case GDK_BUTTON_PRESS:
if (event->button.button == 1) {
active = TRUE;
x = event->button.x;
y = event->button.y;
}
break;
case GDK_BUTTON_RELEASE:
if (event->button.button == 1) {
if (active && (event->button.x == x) &&
(event->button.y == y)) {
spev.type = SPEvent::ACTIVATE;
if ( spitem != nullptr )
{
spitem->emitEvent (spev);
}
}
}
active = FALSE;
break;
case GDK_MOTION_NOTIFY:
active = FALSE;
break;
case GDK_ENTER_NOTIFY:
spev.type = SPEvent::MOUSEOVER;
spev.view = svgview;
if ( spitem != nullptr )
{
spitem->emitEvent (spev);
}
break;
case GDK_LEAVE_NOTIFY:
spev.type = SPEvent::MOUSEOUT;
spev.view = svgview;
if ( spitem != nullptr )
{
spitem->emitEvent (spev);
}
break;
default:
break;
}
return true;
}
/**
* A light-weight widget containing an SPCanvas for rendering an SVG.
*/
SVGViewWidget::SVGViewWidget(SPDocument* document)
{
_canvas = Gtk::make_managed<Inkscape::UI::Widget::Canvas>();
add(*_canvas);
_parent = new Inkscape::CanvasItemGroup(_canvas->get_canvas_item_root());
_drawing = new Inkscape::CanvasItemDrawing(_parent);
_canvas->set_drawing(_drawing->get_drawing());
_drawing->connect_drawing_event(sigc::bind(sigc::ptr_fun(_drawing_handler), this));
setDocument(document);
show_all();
}
SVGViewWidget::~SVGViewWidget()
{
if (_document) {
_document = nullptr;
}
}
void
SVGViewWidget::setDocument(SPDocument* document)
{
// Clear old document
if (_document) {
_document->getRoot()->invoke_hide(_dkey); // Removed from display tree
}
// Add new document
if (document) {
_document = document;
Inkscape::DrawingItem *drawing_item = document->getRoot()->invoke_show(
*_drawing->get_drawing(),
_dkey,
SP_ITEM_SHOW_DISPLAY);
if (drawing_item) {
_drawing->get_drawing()->root()->prependChild(drawing_item);
}
doRescale ();
}
}
void
SVGViewWidget::setResize(int width, int height)
{
// Triggers size_allocation which calls SVGViewWidget::size_allocate.
set_size_request(width, height);
queue_resize();
}
void
SVGViewWidget::on_size_allocate(Gtk::Allocation& allocation)
{
if (!(_allocation == allocation)) {
_allocation = allocation;
double width = allocation.get_width();
double height = allocation.get_height();
if (width < 0.0 || height < 0.0) {
std::cerr << "SVGViewWidget::size_allocate: negative dimensions!" << std::endl;
Gtk::Bin::on_size_allocate(allocation);
return;
}
_rescale = true;
_keepaspect = true;
_width = width;
_height = height;
doRescale ();
}
Gtk::Bin::on_size_allocate(allocation);
}
void
SVGViewWidget::doRescale()
{
if (!_document) {
std::cerr << "SVGViewWidget::doRescale: No document!" << std::endl;
return;
}
if (_document->getWidth().value("px") < 1e-9) {
std::cerr << "SVGViewWidget::doRescale: Width too small!" << std::endl;
return;
}
if (_document->getHeight().value("px") < 1e-9) {
std::cerr << "SVGViewWidget::doRescale: Height too small!" << std::endl;
return;
}
double x_offset = 0.0;
double y_offset = 0.0;
if (_rescale) {
_hscale = _width / _document->getWidth().value("px");
_vscale = _height / _document->getHeight().value("px");
if (_keepaspect) {
if (_hscale > _vscale) {
_hscale = _vscale;
x_offset = (_document->getWidth().value("px") * _hscale - _width) / 2.0;
} else {
_vscale = _hscale;
y_offset = (_document->getHeight().value("px") * _vscale - _height) / 2.0;
}
}
}
if (_drawing) {
_canvas->set_affine(Geom::Scale(_hscale, _vscale));
_canvas->set_pos(Geom::Point(x_offset, y_offset));
}
}
void
SVGViewWidget::mouseover()
{
GdkDisplay *display = gdk_display_get_default();
GdkCursor *cursor = gdk_cursor_new_for_display(display, GDK_HAND2);
GdkWindow *window = gtk_widget_get_window (GTK_WIDGET(_canvas->gobj()));
gdk_window_set_cursor(window, cursor);
g_object_unref(cursor);
}
void
SVGViewWidget::mouseout()
{
GdkWindow *window = gtk_widget_get_window (GTK_WIDGET(_canvas->gobj()));
gdk_window_set_cursor(window, nullptr);
}
} // Namespace View
} // Namespace UI
} // 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:fileencoding=utf-8 :
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