File indexing completed on 2024-11-10 04:57:10

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2009 Michael Zanetti <michael_zanetti@gmx.net>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "slideback.h"
 #include "effect/effecthandler.h"
 
 namespace KWin
 {
 
 SlideBackEffect::SlideBackEffect()
 {
     m_tabboxActive = 0;
     m_justMapped = m_upmostWindow = nullptr;
     connect(effects, &EffectsHandler::windowAdded, this, &SlideBackEffect::slotWindowAdded);
     connect(effects, &EffectsHandler::windowDeleted, this, &SlideBackEffect::slotWindowDeleted);
     connect(effects, &EffectsHandler::tabBoxAdded, this, &SlideBackEffect::slotTabBoxAdded);
     connect(effects, &EffectsHandler::stackingOrderChanged, this, &SlideBackEffect::slotStackingOrderChanged);
     connect(effects, &EffectsHandler::tabBoxClosed, this, &SlideBackEffect::slotTabBoxClosed);
 
     const auto windows = effects->stackingOrder();
     for (EffectWindow *window : windows) {
         slotWindowAdded(window);
     }
 }
 
 void SlideBackEffect::slotStackingOrderChanged()
 {
     if (effects->activeFullScreenEffect() || m_tabboxActive) {
         oldStackingOrder = effects->stackingOrder();
         usableOldStackingOrder = usableWindows(oldStackingOrder);
         return;
     }
 
     QList<EffectWindow *> newStackingOrder = effects->stackingOrder(),
                           usableNewStackingOrder = usableWindows(newStackingOrder);
     if (usableNewStackingOrder == usableOldStackingOrder || usableNewStackingOrder.isEmpty()) {
         oldStackingOrder = newStackingOrder;
         usableOldStackingOrder = usableNewStackingOrder;
         return;
     }
 
     m_upmostWindow = usableNewStackingOrder.last();
 
     if (m_upmostWindow == m_justMapped) { // a window was added, got on top, stacking changed. Nothing impressive
         m_justMapped = nullptr;
     } else if (!usableOldStackingOrder.isEmpty() && m_upmostWindow != usableOldStackingOrder.last()) {
         windowRaised(m_upmostWindow);
     }
 
     oldStackingOrder = newStackingOrder;
     usableOldStackingOrder = usableNewStackingOrder;
 }
 
 void SlideBackEffect::windowRaised(EffectWindow *w)
 {
     // Determine all windows on top of the activated one
     bool currentFound = false;
     for (EffectWindow *tmp : std::as_const(oldStackingOrder)) {
         if (!currentFound) {
             if (tmp == w) {
                 currentFound = true;
             }
         } else {
             if (isWindowUsable(tmp) && tmp->isOnCurrentDesktop() && w->isOnCurrentDesktop()) {
                 // Do we have to move it?
                 if (intersects(w, tmp->frameGeometry().toRect())) {
                     QRect slideRect;
                     slideRect = getSlideDestination(getModalGroupGeometry(w), tmp->frameGeometry().toRect());
                     effects->setElevatedWindow(tmp, true);
                     elevatedList.append(tmp);
                     motionManager.manage(tmp);
                     motionManager.moveWindow(tmp, slideRect);
                     destinationList.insert(tmp, slideRect);
                     coveringWindows.append(tmp);
                 } else {
                     // Does it intersect with a moved (elevated) window and do we have to elevate it too?
                     for (EffectWindow *elevatedWindow : std::as_const(elevatedList)) {
                         if (tmp->frameGeometry().intersects(elevatedWindow->frameGeometry())) {
                             effects->setElevatedWindow(tmp, true);
                             elevatedList.append(tmp);
                             break;
                         }
                     }
                 }
             }
             if (tmp->isDock() || tmp->keepAbove()) {
                 effects->setElevatedWindow(tmp, true);
                 elevatedList.append(tmp);
             }
         }
     }
     // If a window is minimized it could happen that the panels stay elevated without any windows sliding.
     // clear all elevation settings
     if (!motionManager.managingWindows()) {
         for (EffectWindow *tmp : std::as_const(elevatedList)) {
             effects->setElevatedWindow(tmp, false);
         }
     }
 }
 
 QRect SlideBackEffect::getSlideDestination(const QRect &windowUnderGeometry, const QRect &windowOverGeometry)
 {
     // Determine the shortest way:
     int leftSlide = windowUnderGeometry.left() - windowOverGeometry.right() - 20;
     int rightSlide = windowUnderGeometry.right() - windowOverGeometry.left() + 20;
     int upSlide = windowUnderGeometry.top() - windowOverGeometry.bottom() - 20;
     int downSlide = windowUnderGeometry.bottom() - windowOverGeometry.top() + 20;
 
     int horizSlide = leftSlide;
     if (std::abs(horizSlide) > std::abs(rightSlide)) {
         horizSlide = rightSlide;
     }
     int vertSlide = upSlide;
     if (std::abs(vertSlide) > std::abs(downSlide)) {
         vertSlide = downSlide;
     }
 
     QRect slideRect = windowOverGeometry;
     if (std::abs(horizSlide) < std::abs(vertSlide)) {
         slideRect.moveLeft(slideRect.x() + horizSlide);
     } else {
         slideRect.moveTop(slideRect.y() + vertSlide);
     }
     return slideRect;
 }
 
 void SlideBackEffect::prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime)
 {
     int time = 0;
     if (m_lastPresentTime.count()) {
         time = (presentTime - m_lastPresentTime).count();
     }
     m_lastPresentTime = presentTime;
 
     if (motionManager.managingWindows()) {
         motionManager.calculate(time);
         data.mask |= Effect::PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
     }
 
     const QList<EffectWindow *> windows = effects->stackingOrder();
     for (auto *w : windows) {
         w->setData(WindowForceBlurRole, QVariant(true));
     }
 
     effects->prePaintScreen(data, presentTime);
 }
 
 void SlideBackEffect::postPaintScreen()
 {
     if (motionManager.areWindowsMoving()) {
         effects->addRepaintFull();
     }
 
     for (auto &w : effects->stackingOrder()) {
         w->setData(WindowForceBlurRole, QVariant());
     }
 
     effects->postPaintScreen();
 }
 
 void SlideBackEffect::prePaintWindow(EffectWindow *w, WindowPrePaintData &data, std::chrono::milliseconds presentTime)
 {
     if (motionManager.isManaging(w)) {
         data.setTransformed();
     }
 
     effects->prePaintWindow(w, data, presentTime);
 }
 
 void SlideBackEffect::paintWindow(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, QRegion region, WindowPaintData &data)
 {
     if (motionManager.isManaging(w)) {
         motionManager.apply(w, data);
     }
     for (const QRegion &r : std::as_const(clippedRegions)) {
         region = region.intersected(r);
     }
     effects->paintWindow(renderTarget, viewport, w, mask, region, data);
     clippedRegions.clear();
 }
 
 void SlideBackEffect::postPaintWindow(EffectWindow *w)
 {
     if (motionManager.isManaging(w)) {
         if (destinationList.contains(w)) {
             if (!motionManager.isWindowMoving(w)) { // has window reched its destination?
                 // If we are still intersecting with the upmostWindow it is moving. slide to somewhere else
                 // restore the stacking order of all windows not intersecting any more except panels
                 if (coveringWindows.contains(w)) {
                     QList<EffectWindow *> tmpList;
                     for (EffectWindow *tmp : std::as_const(elevatedList)) {
                         QRect elevatedGeometry = tmp->frameGeometry().toRect();
                         if (motionManager.isManaging(tmp)) {
                             elevatedGeometry = motionManager.transformedGeometry(tmp).toAlignedRect();
                         }
                         if (m_upmostWindow && !tmp->isDock() && !tmp->keepAbove() && m_upmostWindow->frameGeometry().intersects(elevatedGeometry)) {
                             QRect newDestination;
                             newDestination = getSlideDestination(getModalGroupGeometry(m_upmostWindow), elevatedGeometry);
                             if (!motionManager.isManaging(tmp)) {
                                 motionManager.manage(tmp);
                             }
                             motionManager.moveWindow(tmp, newDestination);
                             destinationList[tmp] = newDestination;
                         } else {
                             if (!tmp->isDock()) {
                                 bool keepElevated = false;
                                 for (EffectWindow *elevatedWindow : std::as_const(tmpList)) {
                                     if (tmp->frameGeometry().intersects(elevatedWindow->frameGeometry())) {
                                         keepElevated = true;
                                     }
                                 }
                                 if (!keepElevated) {
                                     effects->setElevatedWindow(tmp, false);
                                     elevatedList.removeAll(tmp);
                                 }
                             }
                         }
                         tmpList.append(tmp);
                     }
                 } else {
                     // Move the window back where it belongs
                     motionManager.moveWindow(w, w->frameGeometry().toRect());
                     destinationList.remove(w);
                 }
             }
         } else {
             // is window back at its original position?
             if (!motionManager.isWindowMoving(w)) {
                 motionManager.unmanage(w);
                 effects->addRepaintFull();
             }
         }
         if (coveringWindows.contains(w)) {
             // It could happen that there is no aciveWindow() here if the user clicks the close-button on an inactive window.
             // Just skip... the window will be removed in windowDeleted() later
             if (m_upmostWindow && !intersects(m_upmostWindow, motionManager.transformedGeometry(w).toAlignedRect())) {
                 coveringWindows.removeAll(w);
                 if (coveringWindows.isEmpty()) {
                     // Restore correct stacking order
                     for (EffectWindow *tmp : std::as_const(elevatedList)) {
                         effects->setElevatedWindow(tmp, false);
                     }
                     elevatedList.clear();
                 }
             }
         }
     }
     if (!isActive()) {
         m_lastPresentTime = std::chrono::milliseconds::zero();
     }
     effects->postPaintWindow(w);
 }
 
 void SlideBackEffect::slotWindowDeleted(EffectWindow *w)
 {
     if (w == m_upmostWindow) {
         m_upmostWindow = nullptr;
     }
     if (w == m_justMapped) {
         m_justMapped = nullptr;
     }
     usableOldStackingOrder.removeAll(w);
     oldStackingOrder.removeAll(w);
     coveringWindows.removeAll(w);
     elevatedList.removeAll(w);
     if (motionManager.isManaging(w)) {
         motionManager.unmanage(w);
     }
 }
 
 void SlideBackEffect::slotWindowAdded(EffectWindow *w)
 {
     m_justMapped = w;
 
     connect(w, &EffectWindow::minimizedChanged, this, [this, w]() {
         if (!w->isMinimized()) {
             slotWindowUnminimized(w);
         }
     });
 }
 
 void SlideBackEffect::slotWindowUnminimized(EffectWindow *w)
 {
     // SlideBack should not be triggered on an unminimized window. For this we need to store the last unminimized window.
     m_justMapped = w;
     // the stackingOrderChanged() signal came before the window turned an effect window
     // usually this is no problem as the change shall not be caught anyway, but
     // the window may have changed its stack position, bug #353745
     slotStackingOrderChanged();
 }
 
 void SlideBackEffect::slotTabBoxAdded()
 {
     ++m_tabboxActive;
 }
 
 void SlideBackEffect::slotTabBoxClosed()
 {
     m_tabboxActive = std::max(m_tabboxActive - 1, 0);
 }
 
 bool SlideBackEffect::isWindowUsable(EffectWindow *w)
 {
     return w && (w->isNormalWindow() || w->isDialog()) && !w->keepAbove() && !w->isDeleted() && !w->isMinimized();
 }
 
 bool SlideBackEffect::intersects(EffectWindow *windowUnder, const QRect &windowOverGeometry)
 {
     QRect windowUnderGeometry = getModalGroupGeometry(windowUnder);
     return windowUnderGeometry.intersects(windowOverGeometry);
 }
 
 QList<EffectWindow *> SlideBackEffect::usableWindows(const QList<EffectWindow *> &allWindows)
 {
     QList<EffectWindow *> retList;
     auto isWindowVisible = [](const EffectWindow *window) {
         return window && effects->virtualScreenGeometry().intersects(window->frameGeometry().toAlignedRect());
     };
     for (EffectWindow *tmp : std::as_const(allWindows)) {
         if (isWindowUsable(tmp) && isWindowVisible(tmp)) {
             retList.append(tmp);
         }
     }
     return retList;
 }
 
 QRect SlideBackEffect::getModalGroupGeometry(EffectWindow *w)
 {
     QRect modalGroupGeometry = w->frameGeometry().toRect();
     if (w->isModal()) {
         const auto mainWindows = w->mainWindows();
         for (EffectWindow *modalWindow : mainWindows) {
             modalGroupGeometry = modalGroupGeometry.united(getModalGroupGeometry(modalWindow));
         }
     }
     return modalGroupGeometry;
 }
 
 bool SlideBackEffect::isActive() const
 {
     return motionManager.managingWindows();
 }
 
 } // Namespace
 
 #include "moc_slideback.cpp"