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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* Abstract base class for on-canvas control items.
*/
/*
* Author:
* Tavmjong Bah
*
* Copyright (C) 2020 Tavmjong Bah
*
* Rewrite of SPCanvasItem
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "canvas-item.h"
#include "canvas-item-group.h"
#include "ui/widget/canvas.h"
namespace Inkscape {
CanvasItem::CanvasItem(CanvasItemGroup *group)
: _name("CanvasItem")
{
if (group) {
group->add(this);
_parent = group;
_canvas = group->get_canvas();
_affine = group->get_affine();
}
}
CanvasItem::~CanvasItem()
{
if (_parent) {
_parent->remove(this, false); // remove() should not delete this or we'll double delete!
}
// Clear canvas of item.
request_redraw();
// Clear any pointers to this object in canvas.
_canvas->canvas_item_destructed(this);
}
bool CanvasItem::is_descendant_of(CanvasItem *ancestor)
{
auto item = this;
while (item) {
if (item == ancestor) {
return true;
}
item = item->get_parent();
}
return false;
}
int CanvasItem::get_z_position()
{
if (!_parent) {
std::cerr << "CanvasItem::get_z_position: No parent!" << std::endl;
return -1;
}
size_t position = 0;
for (auto it = _parent->items.begin(); it != _parent->items.end(); ++it, ++position) {
if (&*it == this) {
return position;
}
}
std::cerr << "CanvasItem::get_z_position: item not found!" << std::endl;
return -1;
}
void CanvasItem::set_z_position(unsigned int n)
{
if (!_parent) {
std::cerr << "CanvasItem::set_z_position: No parent!" << std::endl;
}
if (n == 0) {
this->lower_to_bottom(); // Low cost operation
return;
}
if (n > _parent->items.size() - 2) {
this->raise_to_top(); // Low cost operation
return;
}
_parent->items.erase(_parent->items.iterator_to(*this));
size_t position = 0;
for (auto it = _parent->items.begin(); it != _parent->items.end(); ++it, ++position) {
if (position == n) {
_parent->items.insert(it, *this);
break;
}
}
}
void CanvasItem::raise_to_top()
{
if (!_parent) {
std::cerr << "CanvasItem::raise_to_top: No parent!" << std::endl;
}
_parent->items.erase(_parent->items.iterator_to(*this));
_parent->items.push_back(*this);
}
void CanvasItem::lower_to_bottom()
{
if (!_parent) {
std::cerr << "CanvasItem::lower_to_bottom: No parent!" << std::endl;
}
_parent->items.erase(_parent->items.iterator_to(*this));
_parent->items.push_front(*this);
}
// Indicate geometry changed and bounds needs recalculating.
void CanvasItem::request_update()
{
_need_update = true;
if (_parent) {
_parent->request_update();
} else {
_canvas->request_update();
}
}
void CanvasItem::show()
{
if (_visible) {
return; // Already visible.
}
_visible = true;
// update bounds when visibility changes
request_update();
request_redraw();
}
int CanvasItem::grab(Gdk::EventMask event_mask, GdkCursor *cursor)
{
return grab(event_mask, Glib::wrap(cursor));
}
// Grab all events! TODO: Return boolean
int CanvasItem::grab(Gdk::EventMask event_mask, Glib::RefPtr<Gdk::Cursor> cursor)
{
#ifdef CANVAS_ITEM_DEBUG
std::cout << "CanvasItem::grab: " << _name << std::endl;
#endif
// Don't grab if we already have a grabbed item!
if (_canvas->get_grabbed_canvas_item()) {
return -1;
}
auto const display = Gdk::Display::get_default();
auto const seat = display->get_default_seat();
auto const window = _canvas->get_window();
seat->grab(window, Gdk::SEAT_CAPABILITY_ALL_POINTING, false, cursor, nullptr);
_canvas->set_grabbed_canvas_item(this, event_mask);
_canvas->set_current_canvas_item(this); // So that all events go to grabbed item.
return 0;
}
void CanvasItem::ungrab()
{
#ifdef CANVAS_ITEM_DEBUG
std::cout << "CanvasItem::ungrab: " << _name << std::endl;
#endif
if (_canvas->get_grabbed_canvas_item() != this) {
return; // Sanity check
}
_canvas->set_grabbed_canvas_item(nullptr, (Gdk::EventMask)0); // Zero mask
auto const display = Gdk::Display::get_default();
auto const seat = display->get_default_seat();
seat->ungrab();
}
void CanvasItem::hide()
{
if (!_visible) {
return; // Already hidden
}
_visible = false;
// update bounds when visibility changes
request_update();
request_redraw();
}
void CanvasItem::set_fill(guint32 rgba)
{
if (_fill != rgba) {
_fill = rgba;
request_redraw();
}
}
void CanvasItem::set_stroke(guint32 rgba)
{
if (_stroke != rgba) {
_stroke = rgba;
request_redraw();
}
}
void CanvasItem::request_redraw() {
if (_canvas) {
// Queue redraw request
_canvas->redraw_area(_bounds);
}
}
} // Namespace Inkscape
void canvas_item_print_tree(Inkscape::CanvasItem *item)
{
static int level = 0;
if (level == 0) {
std::cout << "Canvas Item Tree" << std::endl;
}
std::cout << "CC: ";
for (unsigned i = 0; i < level; ++i) {
std::cout << " ";
}
std::cout << item->get_z_position() << ": " << item->get_name() << std::endl;
auto group = dynamic_cast<Inkscape::CanvasItemGroup *>(item);
if (group) {
++level;
for (auto & item : group->items) {
canvas_item_print_tree(&item);
}
--level;
}
}
/*
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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