103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
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/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2012, 2013 Martin Gräßlin <mgraesslin@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#ifndef KWIN_XCB_UTILS_H
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#define KWIN_XCB_UTILS_H
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#include <kwinglobals.h>
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#include "utils.h"
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#include <QRect>
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#include <xcb/xcb.h>
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namespace KWin {
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namespace Xcb {
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typedef xcb_window_t WindowId;
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template <typename Reply,
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typename Cookie,
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Reply *(*replyFunc)(xcb_connection_t*, Cookie, xcb_generic_error_t**),
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Cookie (*requestFunc)(xcb_connection_t*, xcb_window_t)>
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class Wrapper
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{
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public:
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explicit Wrapper(WindowId window)
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: m_retrieved(false)
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, m_cookie(requestFunc(connection(), window))
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, m_window(window)
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{
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}
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inline const Reply *operator->() {
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getReply();
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return m_reply.data();
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}
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inline operator bool() {
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getReply();
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return !m_reply.isNull();
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}
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inline const QSharedPointer<Reply> &data() {
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getReply();
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return m_reply;
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}
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inline WindowId window() const {
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return m_window;
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}
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protected:
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void getReply() {
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if (m_retrieved) {
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return;
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}
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m_reply = QSharedPointer<Reply>(replyFunc(connection(), m_cookie, NULL), &free);
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m_retrieved = true;
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}
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private:
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bool m_retrieved;
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Cookie m_cookie;
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WindowId m_window;
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QSharedPointer<Reply> m_reply;
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};
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typedef Wrapper<xcb_get_window_attributes_reply_t, xcb_get_window_attributes_cookie_t, &xcb_get_window_attributes_reply, &xcb_get_window_attributes_unchecked> WindowAttributes;
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class WindowGeometry : public Wrapper<xcb_get_geometry_reply_t, xcb_get_geometry_cookie_t, &xcb_get_geometry_reply, &xcb_get_geometry_unchecked>
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{
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public:
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explicit WindowGeometry(xcb_window_t window) : Wrapper<xcb_get_geometry_reply_t, xcb_get_geometry_cookie_t, &xcb_get_geometry_reply, &xcb_get_geometry_unchecked>(window) {}
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inline QRect rect() {
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const QSharedPointer<xcb_get_geometry_reply_t> &geometry = data();
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if (geometry.isNull()) {
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return QRect();
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}
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return QRect(geometry->x, geometry->y, geometry->width, geometry->height);
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}
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};
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} // namespace X11
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} // namespace KWin
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#endif // KWIN_X11_UTILS_H
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