File indexing completed on 2024-04-28 05:30:16

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2012 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "focuschain.h"
 #include "window.h"
 #include "workspace.h"
 
 namespace KWin
 {
 
 void FocusChain::remove(Window *window)
 {
     for (auto it = m_desktopFocusChains.begin();
          it != m_desktopFocusChains.end();
          ++it) {
         it.value().removeAll(window);
     }
     m_mostRecentlyUsed.removeAll(window);
 }
 
 void FocusChain::addDesktop(VirtualDesktop *desktop)
 {
     m_desktopFocusChains.insert(desktop, Chain());
 }
 
 void FocusChain::removeDesktop(VirtualDesktop *desktop)
 {
     if (m_currentDesktop == desktop) {
         m_currentDesktop = nullptr;
     }
     m_desktopFocusChains.remove(desktop);
 }
 
 Window *FocusChain::getForActivation(VirtualDesktop *desktop) const
 {
     return getForActivation(desktop, workspace()->activeOutput());
 }
 
 Window *FocusChain::getForActivation(VirtualDesktop *desktop, Output *output) const
 {
     auto it = m_desktopFocusChains.constFind(desktop);
     if (it == m_desktopFocusChains.constEnd()) {
         return nullptr;
     }
     const auto &chain = it.value();
     for (int i = chain.size() - 1; i >= 0; --i) {
         auto tmp = chain.at(i);
         // TODO: move the check into Window
         if (!tmp->isShade() && tmp->isShown() && tmp->isOnCurrentActivity()
             && (!m_separateScreenFocus || tmp->output() == output)) {
             return tmp;
         }
     }
     return nullptr;
 }
 
 void FocusChain::update(Window *window, FocusChain::Change change)
 {
     if (!window->wantsTabFocus()) {
         // Doesn't want tab focus, remove
         remove(window);
         return;
     }
 
     if (window->isOnAllDesktops()) {
         // Now on all desktops, add it to focus chains it is not already in
         for (auto it = m_desktopFocusChains.begin();
              it != m_desktopFocusChains.end();
              ++it) {
             auto &chain = it.value();
             // Making first/last works only on current desktop, don't affect all desktops
             if (it.key() == m_currentDesktop
                 && (change == MakeFirst || change == MakeLast)) {
                 if (change == MakeFirst) {
                     makeFirstInChain(window, chain);
                 } else {
                     makeLastInChain(window, chain);
                 }
             } else {
                 insertWindowIntoChain(window, chain);
             }
         }
     } else {
         // Now only on desktop, remove it anywhere else
         for (auto it = m_desktopFocusChains.begin();
              it != m_desktopFocusChains.end();
              ++it) {
             auto &chain = it.value();
             if (window->isOnDesktop(it.key())) {
                 updateWindowInChain(window, change, chain);
             } else {
                 chain.removeAll(window);
             }
         }
     }
 
     // add for most recently used chain
     updateWindowInChain(window, change, m_mostRecentlyUsed);
 }
 
 void FocusChain::updateWindowInChain(Window *window, FocusChain::Change change, Chain &chain)
 {
     if (change == MakeFirst) {
         makeFirstInChain(window, chain);
     } else if (change == MakeLast) {
         makeLastInChain(window, chain);
     } else {
         insertWindowIntoChain(window, chain);
     }
 }
 
 void FocusChain::insertWindowIntoChain(Window *window, Chain &chain)
 {
     Q_ASSERT(!window->isDeleted());
     if (chain.contains(window)) {
         return;
     }
     if (m_activeWindow && m_activeWindow != window && !chain.empty() && chain.last() == m_activeWindow) {
         // Add it after the active window
         chain.insert(chain.size() - 1, window);
     } else {
         // Otherwise add as the first one
         chain.append(window);
     }
 }
 
 void FocusChain::moveAfterWindow(Window *window, Window *reference)
 {
     Q_ASSERT(!window->isDeleted());
     if (!window->wantsTabFocus()) {
         return;
     }
 
     for (auto it = m_desktopFocusChains.begin();
          it != m_desktopFocusChains.end();
          ++it) {
         if (!window->isOnDesktop(it.key())) {
             continue;
         }
         moveAfterWindowInChain(window, reference, it.value());
     }
     moveAfterWindowInChain(window, reference, m_mostRecentlyUsed);
 }
 
 void FocusChain::moveAfterWindowInChain(Window *window, Window *reference, Chain &chain)
 {
     Q_ASSERT(!window->isDeleted());
     if (!chain.contains(reference)) {
         return;
     }
     if (Window::belongToSameApplication(reference, window)) {
         chain.removeAll(window);
         chain.insert(chain.indexOf(reference), window);
     } else {
         chain.removeAll(window);
         for (int i = chain.size() - 1; i >= 0; --i) {
             if (Window::belongToSameApplication(reference, chain.at(i))) {
                 chain.insert(i, window);
                 break;
             }
         }
     }
 }
 
 Window *FocusChain::firstMostRecentlyUsed() const
 {
     if (m_mostRecentlyUsed.isEmpty()) {
         return nullptr;
     }
     return m_mostRecentlyUsed.first();
 }
 
 Window *FocusChain::nextMostRecentlyUsed(Window *reference) const
 {
     if (m_mostRecentlyUsed.isEmpty()) {
         return nullptr;
     }
     const int index = m_mostRecentlyUsed.indexOf(reference);
     if (index == -1) {
         return m_mostRecentlyUsed.first();
     }
     if (index == 0) {
         return m_mostRecentlyUsed.last();
     }
     return m_mostRecentlyUsed.at(index - 1);
 }
 
 // copied from activation.cpp
 bool FocusChain::isUsableFocusCandidate(Window *c, Window *prev) const
 {
     return c != prev && !c->isShade() && c->isShown() && c->isOnCurrentDesktop() && c->isOnCurrentActivity() && (!m_separateScreenFocus || c->isOnOutput(prev ? prev->output() : workspace()->activeOutput()));
 }
 
 Window *FocusChain::nextForDesktop(Window *reference, VirtualDesktop *desktop) const
 {
     auto it = m_desktopFocusChains.constFind(desktop);
     if (it == m_desktopFocusChains.constEnd()) {
         return nullptr;
     }
     const auto &chain = it.value();
     for (int i = chain.size() - 1; i >= 0; --i) {
         auto window = chain.at(i);
         if (isUsableFocusCandidate(window, reference)) {
             return window;
         }
     }
     return nullptr;
 }
 
 void FocusChain::makeFirstInChain(Window *window, Chain &chain)
 {
     Q_ASSERT(!window->isDeleted());
     chain.removeAll(window);
     chain.append(window);
 }
 
 void FocusChain::makeLastInChain(Window *window, Chain &chain)
 {
     Q_ASSERT(!window->isDeleted());
     chain.removeAll(window);
     chain.prepend(window);
 }
 
 bool FocusChain::contains(Window *window, VirtualDesktop *desktop) const
 {
     auto it = m_desktopFocusChains.constFind(desktop);
     if (it == m_desktopFocusChains.constEnd()) {
         return false;
     }
     return it.value().contains(window);
 }
 
 } // namespace
 
 #include "moc_focuschain.cpp"