File indexing completed on 2025-04-27 11:33:01

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 1999, 2000 Matthias Ettrich <ettrich@kde.org>
     SPDX-FileCopyrightText: 2003 Lubos Lunak <l.lunak@kde.org>
     SPDX-FileCopyrightText: 2012 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "x11_standalone_windowselector.h"
 #include "cursor.h"
 #include "unmanaged.h"
 #include "utils/xcbutils.h"
 #include "workspace.h"
 #include "x11window.h"
 // XLib
 #include <X11/Xutil.h>
 #include <X11/cursorfont.h>
 #include <fixx11h.h>
 // XCB
 #include <xcb/xcb_keysyms.h>
 
 namespace KWin
 {
 
 WindowSelector::WindowSelector()
     : X11EventFilter(QVector<int>{
         XCB_BUTTON_PRESS,
         XCB_BUTTON_RELEASE,
         XCB_MOTION_NOTIFY,
         XCB_ENTER_NOTIFY,
         XCB_LEAVE_NOTIFY,
         XCB_KEY_PRESS,
         XCB_KEY_RELEASE,
         XCB_FOCUS_IN,
         XCB_FOCUS_OUT,
     })
     , m_active(false)
 {
 }
 
 WindowSelector::~WindowSelector()
 {
 }
 
 void WindowSelector::start(std::function<void(KWin::Window *)> callback, const QByteArray &cursorName)
 {
     if (m_active) {
         callback(nullptr);
         return;
     }
 
     m_active = activate(cursorName);
     if (!m_active) {
         callback(nullptr);
         return;
     }
     m_callback = callback;
 }
 
 void WindowSelector::start(std::function<void(const QPoint &)> callback)
 {
     if (m_active) {
         callback(QPoint(-1, -1));
         return;
     }
 
     m_active = activate();
     if (!m_active) {
         callback(QPoint(-1, -1));
         return;
     }
     m_pointSelectionFallback = callback;
 }
 
 bool WindowSelector::activate(const QByteArray &cursorName)
 {
     xcb_cursor_t cursor = createCursor(cursorName);
 
     xcb_connection_t *c = connection();
     UniqueCPtr<xcb_grab_pointer_reply_t> grabPointer(xcb_grab_pointer_reply(c, xcb_grab_pointer_unchecked(c, false, rootWindow(), XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION | XCB_EVENT_MASK_ENTER_WINDOW | XCB_EVENT_MASK_LEAVE_WINDOW, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, XCB_WINDOW_NONE, cursor, XCB_TIME_CURRENT_TIME), nullptr));
     if (!grabPointer || grabPointer->status != XCB_GRAB_STATUS_SUCCESS) {
         return false;
     }
     const bool grabbed = grabXKeyboard();
     if (grabbed) {
         grabXServer();
     } else {
         xcb_ungrab_pointer(connection(), XCB_TIME_CURRENT_TIME);
     }
     return grabbed;
 }
 
 xcb_cursor_t WindowSelector::createCursor(const QByteArray &cursorName)
 {
     if (cursorName.isEmpty()) {
         return Cursors::self()->mouse()->x11Cursor(Qt::CrossCursor);
     }
     xcb_cursor_t cursor = Cursors::self()->mouse()->x11Cursor(cursorName);
     if (cursor != XCB_CURSOR_NONE) {
         return cursor;
     }
     if (cursorName == QByteArrayLiteral("pirate")) {
         // special handling for font pirate cursor
         static xcb_cursor_t kill_cursor = XCB_CURSOR_NONE;
         if (kill_cursor != XCB_CURSOR_NONE) {
             return kill_cursor;
         }
         // fallback on font
         xcb_connection_t *c = connection();
         const xcb_font_t cursorFont = xcb_generate_id(c);
         xcb_open_font(c, cursorFont, strlen("cursor"), "cursor");
         cursor = xcb_generate_id(c);
         xcb_create_glyph_cursor(c, cursor, cursorFont, cursorFont,
                                 XC_pirate, /* source character glyph */
                                 XC_pirate + 1, /* mask character glyph */
                                 0, 0, 0, 0, 0, 0); /* r b g r b g */
         kill_cursor = cursor;
     }
     return cursor;
 }
 
 void WindowSelector::processEvent(xcb_generic_event_t *event)
 {
     if (event->response_type == XCB_BUTTON_RELEASE) {
         xcb_button_release_event_t *buttonEvent = reinterpret_cast<xcb_button_release_event_t *>(event);
         handleButtonRelease(buttonEvent->detail, buttonEvent->child);
     } else if (event->response_type == XCB_KEY_PRESS) {
         xcb_key_press_event_t *keyEvent = reinterpret_cast<xcb_key_press_event_t *>(event);
         handleKeyPress(keyEvent->detail, keyEvent->state);
     }
 }
 
 bool WindowSelector::event(xcb_generic_event_t *event)
 {
     if (!m_active) {
         return false;
     }
     processEvent(event);
 
     return true;
 }
 
 void WindowSelector::handleButtonRelease(xcb_button_t button, xcb_window_t window)
 {
     if (button == XCB_BUTTON_INDEX_3) {
         cancelCallback();
         release();
         return;
     }
     if (button == XCB_BUTTON_INDEX_1 || button == XCB_BUTTON_INDEX_2) {
         if (m_callback) {
             selectWindowId(window);
         } else if (m_pointSelectionFallback) {
             m_pointSelectionFallback(Cursors::self()->mouse()->pos());
         }
         release();
         return;
     }
 }
 
 void WindowSelector::handleKeyPress(xcb_keycode_t keycode, uint16_t state)
 {
     xcb_key_symbols_t *symbols = xcb_key_symbols_alloc(connection());
     xcb_keysym_t kc = xcb_key_symbols_get_keysym(symbols, keycode, 0);
     int mx = 0;
     int my = 0;
     const bool returnPressed = (kc == XK_Return) || (kc == XK_space);
     const bool escapePressed = (kc == XK_Escape);
     if (kc == XK_Left) {
         mx = -10;
     }
     if (kc == XK_Right) {
         mx = 10;
     }
     if (kc == XK_Up) {
         my = -10;
     }
     if (kc == XK_Down) {
         my = 10;
     }
     if (state & XCB_MOD_MASK_CONTROL) {
         mx /= 10;
         my /= 10;
     }
     Cursors::self()->mouse()->setPos(Cursors::self()->mouse()->pos() + QPoint(mx, my));
     if (returnPressed) {
         if (m_callback) {
             selectWindowUnderPointer();
         } else if (m_pointSelectionFallback) {
             m_pointSelectionFallback(Cursors::self()->mouse()->pos());
         }
     }
     if (returnPressed || escapePressed) {
         if (escapePressed) {
             cancelCallback();
         }
         release();
     }
     xcb_key_symbols_free(symbols);
 }
 
 void WindowSelector::selectWindowUnderPointer()
 {
     Xcb::Pointer pointer(rootWindow());
     if (!pointer.isNull() && pointer->child != XCB_WINDOW_NONE) {
         selectWindowId(pointer->child);
     }
 }
 
 void WindowSelector::release()
 {
     ungrabXKeyboard();
     xcb_ungrab_pointer(connection(), XCB_TIME_CURRENT_TIME);
     ungrabXServer();
     m_active = false;
     m_callback = std::function<void(KWin::Window *)>();
     m_pointSelectionFallback = std::function<void(const QPoint &)>();
 }
 
 void WindowSelector::selectWindowId(xcb_window_t window_to_select)
 {
     if (window_to_select == XCB_WINDOW_NONE) {
         m_callback(nullptr);
         return;
     }
     xcb_window_t window = window_to_select;
     X11Window *client = nullptr;
     while (true) {
         client = Workspace::self()->findClient(Predicate::FrameIdMatch, window);
         if (client) {
             break; // Found the client
         }
         Xcb::Tree tree(window);
         if (window == tree->root) {
             // We didn't find the client, probably an override-redirect window
             break;
         }
         window = tree->parent; // Go up
     }
     if (client) {
         m_callback(client);
     } else {
         m_callback(Workspace::self()->findUnmanaged(window_to_select));
     }
 }
 
 void WindowSelector::cancelCallback()
 {
     if (m_callback) {
         m_callback(nullptr);
     } else if (m_pointSelectionFallback) {
         m_pointSelectionFallback(QPoint(-1, -1));
     }
 }
 
 } // namespace