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// SPDX-License-Identifier: GPL-2.0-or-later
/* Authors:
* Jon A. Cruz
*
* Copyright (C) 2010 Jon A. Cruz
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "widgets/desktop-widget.h"
#include "desktop-tracker.h"
#include "inkscape.h"
#include "desktop.h"
namespace Inkscape {
namespace UI {
namespace Dialog {
DesktopTracker::DesktopTracker() :
base(nullptr),
desktop(nullptr),
widget(nullptr),
hierID(0),
trackActive(false),
desktopChangedSig()
{
}
DesktopTracker::~DesktopTracker()
{
disconnect();
}
void DesktopTracker::connect(GtkWidget *widget)
{
disconnect();
this->widget = widget;
// Use C/gobject callbacks to avoid gtkmm rewrap-during-destruct issues:
hierID = g_signal_connect( G_OBJECT(widget), "hierarchy-changed", G_CALLBACK(hierarchyChangeCB), this );
inkID = INKSCAPE.signal_activate_desktop.connect(
sigc::bind(
sigc::ptr_fun(&DesktopTracker::activateDesktopCB), this)
);
GtkWidget *wdgt = gtk_widget_get_ancestor(widget, SP_TYPE_DESKTOP_WIDGET);
if (wdgt && !base) {
SPDesktopWidget *dtw = SP_DESKTOP_WIDGET(wdgt);
if (dtw && dtw->desktop) {
setBase(dtw->desktop); // may also set desktop
}
}
}
void DesktopTracker::disconnect()
{
if (hierID) {
if (widget) {
g_signal_handler_disconnect(G_OBJECT(widget), hierID);
}
hierID = 0;
}
if (inkID.connected()) {
inkID.disconnect();
}
}
void DesktopTracker::setBase(SPDesktop *desktop)
{
if (this->base != desktop) {
base = desktop;
// Do not override an existing target desktop
if (!this->desktop) {
setDesktop(desktop);
}
}
}
SPDesktop *DesktopTracker::getBase() const
{
return base;
}
SPDesktop *DesktopTracker::getDesktop() const
{
return desktop;
}
sigc::connection DesktopTracker::connectDesktopChanged( const sigc::slot<void, SPDesktop*> & slot )
{
return desktopChangedSig.connect(slot);
}
void DesktopTracker::activateDesktopCB(SPDesktop *desktop, DesktopTracker *self )
{
if (self && self->trackActive) {
self->setDesktop(desktop);
}
//return FALSE;
}
bool DesktopTracker::hierarchyChangeCB(GtkWidget * /*widget*/, GtkWidget* /*prev*/, DesktopTracker *self)
{
if (self) {
self->handleHierarchyChange();
}
return false;
}
void DesktopTracker::handleHierarchyChange()
{
GtkWidget *wdgt = gtk_widget_get_ancestor(widget, SP_TYPE_DESKTOP_WIDGET);
bool newFlag = (wdgt == nullptr); // true means not in an SPDesktopWidget, thus floating.
if (wdgt && !base) {
SPDesktopWidget *dtw = SP_DESKTOP_WIDGET(wdgt);
if (dtw && dtw->desktop) {
setBase(dtw->desktop); // may also set desktop
}
}
if (newFlag != trackActive) {
trackActive = newFlag;
if (trackActive) {
setDesktop(SP_ACTIVE_DESKTOP);
} else if (desktop != base) {
setDesktop(getBase());
}
}
}
void DesktopTracker::setDesktop(SPDesktop *desktop)
{
if (desktop != this->desktop) {
this->desktop = desktop;
desktopChangedSig.emit(desktop);
}
}
} // namespace Dialog
} // 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:textwidth=99 :
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