File indexing completed on 2024-05-05 05:35:17

 /*
     SPDX-FileCopyrightText: 2014 Hugo Pereira Da Costa <hugo.pereira@free.fr>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "oxygensizegrip.h"
 
 #include <KDecoration2/DecoratedClient>
 
 #include <QPainter>
 #include <QPalette>
 #include <QPolygon>
 #include <QTimer>
 
 #if OXYGEN_HAVE_X11
 #include <private/qtx11extras_p.h>
 #endif
 
 namespace Oxygen
 {
 //* scoped pointer convenience typedef
 template<typename T>
 using ScopedPointer = QScopedPointer<T, QScopedPointerPodDeleter>;
 
 //_____________________________________________
 SizeGrip::SizeGrip(Decoration *decoration)
     : QWidget(nullptr)
     , m_decoration(decoration)
 {
     setAttribute(Qt::WA_NoSystemBackground);
     setAutoFillBackground(false);
 
     // cursor
     setCursor(Qt::SizeFDiagCursor);
 
     // size
     setFixedSize(QSize(GripSize, GripSize));
 
     // mask
     QPolygon p;
     p << QPoint(0, GripSize) << QPoint(GripSize, 0) << QPoint(GripSize, GripSize) << QPoint(0, GripSize);
 
     setMask(QRegion(p));
 
     // embed
     embed();
     updatePosition();
 
     // connections
     const auto *clientP = decoration->client();
     connect(clientP, &KDecoration2::DecoratedClient::widthChanged, this, &SizeGrip::updatePosition);
     connect(clientP, &KDecoration2::DecoratedClient::heightChanged, this, &SizeGrip::updatePosition);
     connect(clientP, &KDecoration2::DecoratedClient::activeChanged, this, &SizeGrip::updateActiveState);
 
     // show
     show();
 }
 
 //_____________________________________________
 void SizeGrip::updateActiveState(void)
 {
 #if OXYGEN_HAVE_X11
     if (QX11Info::isPlatformX11()) {
         const quint32 value = XCB_STACK_MODE_ABOVE;
         xcb_configure_window(QX11Info::connection(), winId(), XCB_CONFIG_WINDOW_STACK_MODE, &value);
         xcb_map_window(QX11Info::connection(), winId());
     }
 #endif
 
     update();
 }
 
 //_____________________________________________
 void SizeGrip::embed(void)
 {
 #if OXYGEN_HAVE_X11
 
     if (!QX11Info::isPlatformX11())
         return;
 
     xcb_window_t windowId = m_decoration->client()->windowId();
     if (windowId) {
         /*
         find client's parent
         we want the size grip to be at the same level as the client in the stack
         */
         xcb_window_t current = windowId;
         auto connection = QX11Info::connection();
         xcb_query_tree_cookie_t cookie = xcb_query_tree_unchecked(connection, current);
         ScopedPointer<xcb_query_tree_reply_t> tree(xcb_query_tree_reply(connection, cookie, nullptr));
         if (!tree.isNull() && tree->parent)
             current = tree->parent;
 
         // reparent
         xcb_reparent_window(connection, winId(), current, 0, 0);
         setWindowTitle(QStringLiteral("Oxygen::SizeGrip"));
 
     } else {
         hide();
     }
 
 #endif
 }
 
 //_____________________________________________
 void SizeGrip::paintEvent(QPaintEvent *)
 {
     if (!m_decoration)
         return;
 
     // get relevant colors
     const QColor backgroundColor(m_decoration->client()->palette().color(QPalette::Window));
 
     // create and configure painter
     QPainter painter(this);
     painter.setRenderHints(QPainter::Antialiasing);
 
     painter.setPen(Qt::NoPen);
     painter.setBrush(backgroundColor);
 
     // polygon
     QPolygon p;
     p << QPoint(0, GripSize) << QPoint(GripSize, 0) << QPoint(GripSize, GripSize) << QPoint(0, GripSize);
     painter.drawPolygon(p);
 }
 
 //_____________________________________________
 void SizeGrip::mousePressEvent(QMouseEvent *event)
 {
     switch (event->button()) {
     case Qt::RightButton: {
         hide();
         QTimer::singleShot(5000, this, SLOT(show()));
         break;
     }
 
     case Qt::MiddleButton: {
         hide();
         break;
     }
 
     case Qt::LeftButton:
         if (rect().contains(event->pos())) {
             sendMoveResizeEvent(event->pos());
         }
         break;
 
     default:
         break;
     }
 
     return;
 }
 
 //_______________________________________________________________________________
 void SizeGrip::updatePosition(void)
 {
 #if OXYGEN_HAVE_X11
     if (!QX11Info::isPlatformX11())
         return;
 
     const auto c = m_decoration->client();
     QPoint position(c->width() - GripSize - Offset, c->height() - GripSize - Offset);
 
     quint32 values[2] = {quint32(position.x()), quint32(position.y())};
     xcb_configure_window(QX11Info::connection(), winId(), XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, values);
 #endif
 }
 
 //_____________________________________________
 void SizeGrip::sendMoveResizeEvent(QPoint position)
 {
 #if OXYGEN_HAVE_X11
     if (!QX11Info::isPlatformX11())
         return;
 
     // pointer to connection
     auto connection(QX11Info::connection());
 
     /*
     get root position matching position
     need to use xcb because the embedding of the widget
     breaks QT's mapToGlobal and other methods
     */
     QPoint rootPosition(position);
     xcb_get_geometry_cookie_t cookie(xcb_get_geometry(connection, winId()));
     ScopedPointer<xcb_get_geometry_reply_t> reply(xcb_get_geometry_reply(connection, cookie, nullptr));
     if (reply) {
         // translate coordinates
         xcb_translate_coordinates_cookie_t coordCookie(
             xcb_translate_coordinates(connection, winId(), reply.data()->root, -reply.data()->border_width, -reply.data()->border_width));
 
         ScopedPointer<xcb_translate_coordinates_reply_t> coordReply(xcb_translate_coordinates_reply(connection, coordCookie, nullptr));
 
         if (coordReply) {
             rootPosition.rx() += coordReply.data()->dst_x;
             rootPosition.ry() += coordReply.data()->dst_y;
         }
     }
 
     // move/resize atom
     if (!m_moveResizeAtom) {
         // create atom if not found
         const QString atomName = QStringLiteral("_NET_WM_MOVERESIZE");
         xcb_intern_atom_cookie_t cookie(xcb_intern_atom(connection, false, atomName.size(), qPrintable(atomName)));
         ScopedPointer<xcb_intern_atom_reply_t> reply(xcb_intern_atom_reply(connection, cookie, nullptr));
         m_moveResizeAtom = reply ? reply->atom : 0;
     }
 
     if (!m_moveResizeAtom)
         return;
 
     // button release event
     xcb_button_release_event_t releaseEvent;
     memset(&releaseEvent, 0, sizeof(releaseEvent));
 
     releaseEvent.response_type = XCB_BUTTON_RELEASE;
     releaseEvent.event = winId();
     releaseEvent.child = XCB_WINDOW_NONE;
     releaseEvent.root = QX11Info::appRootWindow();
     releaseEvent.event_x = position.x();
     releaseEvent.event_y = position.y();
     releaseEvent.root_x = rootPosition.x();
     releaseEvent.root_y = rootPosition.y();
     releaseEvent.detail = XCB_BUTTON_INDEX_1;
     releaseEvent.state = XCB_BUTTON_MASK_1;
     releaseEvent.time = XCB_CURRENT_TIME;
     releaseEvent.same_screen = true;
     xcb_send_event(connection, false, winId(), XCB_EVENT_MASK_BUTTON_RELEASE, reinterpret_cast<const char *>(&releaseEvent));
 
     xcb_ungrab_pointer(connection, XCB_TIME_CURRENT_TIME);
 
     // move resize event
     xcb_client_message_event_t clientMessageEvent;
     memset(&clientMessageEvent, 0, sizeof(clientMessageEvent));
 
     clientMessageEvent.response_type = XCB_CLIENT_MESSAGE;
     clientMessageEvent.type = m_moveResizeAtom;
     clientMessageEvent.format = 32;
     clientMessageEvent.window = m_decoration->client()->windowId();
     clientMessageEvent.data.data32[0] = rootPosition.x();
     clientMessageEvent.data.data32[1] = rootPosition.y();
     clientMessageEvent.data.data32[2] = 4; // bottom right
     clientMessageEvent.data.data32[3] = Qt::LeftButton;
     clientMessageEvent.data.data32[4] = 0;
 
     xcb_send_event(connection,
                    false,
                    QX11Info::appRootWindow(),
                    XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT,
                    reinterpret_cast<const char *>(&clientMessageEvent));
 
     xcb_flush(connection);
 #endif
 }
 }