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// SPDX-License-Identifier: GPL-2.0-or-later
/* Authors:
* Thomas Holder
*
* Copyright (C) 2020 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "scroll-utils.h"
#include <gtkmm/scrolledwindow.h>
namespace Inkscape {
namespace UI {
namespace Widget {
/**
* Get the first ancestor which is scrollable.
*/
Gtk::Widget *get_scrollable_ancestor(Gtk::Widget *widget)
{
auto parent = widget->get_parent();
if (!parent) {
return nullptr;
}
if (auto scrollable = dynamic_cast<Gtk::ScrolledWindow *>(parent)) {
return scrollable;
}
return get_scrollable_ancestor(parent);
}
/**
* Return true if scrolling is allowed.
*
* Scrolling is allowed for any of:
* - Shift modifier is pressed
* - Widget has focus
* - Widget has no scrollable ancestor
*/
bool scrolling_allowed(Gtk::Widget *widget, GdkEventScroll *event)
{
bool const shift = event && (event->state & GDK_SHIFT_MASK);
return shift || //
widget->has_focus() || //
get_scrollable_ancestor(widget) == nullptr;
}
} // namespace Widget
} // namespace UI
} // namespace Inkscape
// vim: filetype=cpp:expandtab:shiftwidth=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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