1 files changed, 156 insertions, 8 deletions

diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index 4b74b67..0acef0b 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -565,6 +565,9 @@ void QGraphicsScenePrivate::removeItemHelper(QGraphicsItem *item)
             q->removeItem(item->d_ptr->children.at(i));
     }
 
+    if (item->isPanel() && item->isVisible() && item->panelModality() != QGraphicsItem::NonModal)
+        leaveModal(item);
+
     // Reset the mouse grabber and focus item data.
     if (mouseGrabberItems.contains(item))
         ungrabMouse(item, /* item is dying */ item->d_ptr->inDestructor);
@@ -1111,6 +1114,9 @@ void QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent *mouseEvent)
     }
 
     QGraphicsItem *item = mouseGrabberItems.last();
+    if (item->isBlockedByModalPanel())
+        return;
+
     for (int i = 0x1; i <= 0x10; i <<= 1) {
         Qt::MouseButton button = Qt::MouseButton(i);
         mouseEvent->setButtonDownPos(button, mouseGrabberButtonDownPos.value(button, item->d_ptr->genericMapFromScene(mouseEvent->scenePos(), mouseEvent->widget())));
@@ -1134,6 +1140,8 @@ void QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent *mou
 
     // Deliver to any existing mouse grabber.
     if (!mouseGrabberItems.isEmpty()) {
+        if (mouseGrabberItems.last()->isBlockedByModalPanel())
+            return;
         // The event is ignored by default, but we disregard the event's
         // accepted state after delivery; the mouse is grabbed, after all.
         sendMouseEvent(mouseEvent);
@@ -1151,12 +1159,22 @@ void QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent *mou
     // Update window activation.
     QGraphicsItem *topItem = cachedItemsUnderMouse.value(0);
     QGraphicsWidget *newActiveWindow = topItem ? topItem->window() : 0;
+    if (newActiveWindow && newActiveWindow->isBlockedByModalPanel(&topItem)) {
+        // pass activation to the blocking modal window
+        newActiveWindow = topItem ? topItem->window() : 0;
+    }
+
     if (newActiveWindow != q->activeWindow())
         q->setActiveWindow(newActiveWindow);
 
     // Set focus on the topmost enabled item that can take focus.
     bool setFocus = false;
     foreach (QGraphicsItem *item, cachedItemsUnderMouse) {
+        if (item->isBlockedByModalPanel()) {
+            // Make sure we don't clear focus.
+            setFocus = true;
+            break;
+        }
         if (item->isEnabled() && ((item->flags() & QGraphicsItem::ItemIsFocusable) && item->d_ptr->mouseSetsFocus)) {
             if (!item->isWidget() || ((QGraphicsWidget *)item)->focusPolicy() & Qt::ClickFocus) {
                 setFocus = true;
@@ -1165,12 +1183,27 @@ void QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent *mou
                 break;
             }
         }
+        if (item->isPanel())
+            break;
+    }
+
+    // Check for scene modality.
+    bool sceneModality = false;
+    for (int i = 0; i < modalPanels.size(); ++i) {
+        if (modalPanels.at(i)->panelModality() == QGraphicsItem::SceneModal) {
+            sceneModality = true;
+            break;
+        }
     }
 
     // If nobody could take focus, clear it.
-    if (!stickyFocus && !setFocus)
+    if (!stickyFocus && !setFocus && !sceneModality)
         q->setFocusItem(0, Qt::MouseFocusReason);
 
+    // Any item will do.
+    if (sceneModality && cachedItemsUnderMouse.isEmpty())
+        cachedItemsUnderMouse << modalPanels.first();
+
     // Find a mouse grabber by sending mouse press events to all mouse grabber
     // candidates one at a time, until the event is accepted. It's accepted by
     // default, so the receiver has to explicitly ignore it for it to pass
@@ -1181,6 +1214,10 @@ void QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent *mou
             continue;
         }
 
+        // Check if this item is blocked by a modal panel and deliver the mouse event to the
+        // blocking panel instead of this item if blocked.
+        (void) item->isBlockedByModalPanel(&item);
+
         grabMouse(item, /* implicit = */ true);
         mouseEvent->accept();
 
@@ -2403,6 +2440,8 @@ void QGraphicsScene::addItem(QGraphicsItem *item)
         d->selectedItems << item;
     if (item->isWidget() && item->isVisible() && static_cast<QGraphicsWidget *>(item)->windowType() == Qt::Popup)
         d->addPopup(static_cast<QGraphicsWidget *>(item));
+    if (item->isPanel() && item->isVisible() && item->panelModality() != QGraphicsItem::NonModal)
+        d->enterModal(item);
 
     // Update creation order focus chain. Make sure to leave the widget's
     // internal tab order intact.
@@ -3205,8 +3244,12 @@ bool QGraphicsScene::event(QEvent *event)
         }
         return false;
     case QEvent::GraphicsSceneMouseMove:
-        mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+    {
+        QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
+        d->lastSceneMousePos = mouseEvent->scenePos();
+        mouseMoveEvent(mouseEvent);
         break;
+    }
     case QEvent::GraphicsSceneMousePress:
         mousePressEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
         break;
@@ -3228,8 +3271,12 @@ bool QGraphicsScene::event(QEvent *event)
     case QEvent::GraphicsSceneHoverEnter:
     case QEvent::GraphicsSceneHoverLeave:
     case QEvent::GraphicsSceneHoverMove:
-        d->dispatchHoverEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+    {
+        QGraphicsSceneHoverEvent *hoverEvent = static_cast<QGraphicsSceneHoverEvent *>(event);
+        d->lastSceneMousePos = hoverEvent->scenePos();
+        d->dispatchHoverEvent(hoverEvent);
         break;
+    }
     case QEvent::Leave:
         d->leaveScene();
         break;
@@ -3599,8 +3646,10 @@ void QGraphicsScene::helpEvent(QGraphicsSceneHelpEvent *helpEvent)
 
 bool QGraphicsScenePrivate::itemAcceptsHoverEvents_helper(const QGraphicsItem *item) const
 {
-    return item->acceptHoverEvents()
-        || (item->isWidget() && static_cast<const QGraphicsWidget *>(item)->d_func()->hasDecoration());
+    return (!item->isBlockedByModalPanel() &&
+            (item->acceptHoverEvents()
+             || (item->isWidget()
+                 && static_cast<const QGraphicsWidget *>(item)->d_func()->hasDecoration())));
 }
 
 /*!
@@ -3674,7 +3723,9 @@ bool QGraphicsScenePrivate::dispatchHoverEvent(QGraphicsSceneHoverEvent *hoverEv
     }
 
     // Generate a move event for the item itself
-    if (item && !hoverItems.isEmpty() && item == hoverItems.last()) {
+    if (item
+        && !hoverItems.isEmpty()
+        && item == hoverItems.last()) {
         sendHoverEvent(QEvent::GraphicsSceneHoverMove, item, hoverEvent);
         return true;
     }
@@ -3708,8 +3759,7 @@ void QGraphicsScenePrivate::leaveScene()
 
     while (!hoverItems.isEmpty()) {
         QGraphicsItem *lastItem = hoverItems.takeLast();
-        if (lastItem->acceptHoverEvents()
-            || (lastItem->isWidget() && static_cast<QGraphicsWidget*>(lastItem)->d_func()->hasDecoration()))
+        if (itemAcceptsHoverEvents_helper(lastItem))
             sendHoverEvent(QEvent::GraphicsSceneHoverLeave, lastItem, &hoverEvent);
     }
 }
@@ -3736,6 +3786,8 @@ void QGraphicsScene::keyPressEvent(QKeyEvent *keyEvent)
             keyEvent->accept();
             // Send it; QGraphicsItem::keyPressEvent ignores it.  If the event
             // is filtered out, stop propagating it.
+            if (p->isBlockedByModalPanel())
+                break;
             if (!d->sendEvent(p, keyEvent))
                 break;
         } while (!keyEvent->isAccepted() && !p->isPanel() && (p = p->parentItem()));
@@ -3766,6 +3818,8 @@ void QGraphicsScene::keyReleaseEvent(QKeyEvent *keyEvent)
             keyEvent->accept();
             // Send it; QGraphicsItem::keyPressEvent ignores it.  If the event
             // is filtered out, stop propagating it.
+            if (p->isBlockedByModalPanel())
+                break;
             if (!d->sendEvent(p, keyEvent))
                 break;
         } while (!keyEvent->isAccepted() && !p->isPanel() && (p = p->parentItem()));
@@ -5420,6 +5474,8 @@ void QGraphicsScenePrivate::touchEventHandler(QTouchEvent *sceneTouchEvent)
     for (; it != end; ++it) {
         QGraphicsItem *item = it.key();
 
+        (void) item->isBlockedByModalPanel(&item);
+
         // determine event type from the state mask
         QEvent::Type eventType;
         switch (it.value().first) {
@@ -5493,6 +5549,8 @@ bool QGraphicsScenePrivate::sendTouchBeginEvent(QGraphicsItem *origin, QTouchEve
                 break;
             }
         }
+        if (item->isPanel())
+            break;
     }
 
     // If nobody could take focus, clear it.
@@ -5518,6 +5576,8 @@ bool QGraphicsScenePrivate::sendTouchBeginEvent(QGraphicsItem *origin, QTouchEve
             }
             break;
         }
+        if (item->isPanel())
+            break;
     }
 
     touchEvent->setAccepted(eventAccepted);
@@ -5536,6 +5596,94 @@ void QGraphicsScenePrivate::updateInputMethodSensitivityInViews()
         views.at(i)->d_func()->updateInputMethodSensitivity();
 }
 
+void QGraphicsScenePrivate::enterModal(QGraphicsItem *panel, QGraphicsItem::PanelModality previousModality)
+{
+    Q_Q(QGraphicsScene);
+    Q_ASSERT(panel && panel->isPanel());
+
+    QGraphicsItem::PanelModality panelModality = panel->d_ptr->panelModality;
+    if (previousModality != QGraphicsItem::NonModal) {
+        // the panel is changing from one modality type to another... temporarily set it back so
+        // that blockedPanels is populated correctly
+        panel->d_ptr->panelModality = previousModality;
+    }
+
+    QSet<QGraphicsItem *> blockedPanels;
+    QList<QGraphicsItem *> items = q->items(); // ### store panels separately
+    for (int i = 0; i < items.count(); ++i) {
+        QGraphicsItem *item = items.at(i);
+        if (item->isPanel() && item->isBlockedByModalPanel())
+            blockedPanels.insert(item);
+    }
+    // blockedPanels contains all currently blocked panels
+
+    if (previousModality != QGraphicsItem::NonModal) {
+        // reset the modality to the proper value, since we changed it above
+        panel->d_ptr->panelModality = panelModality;
+        // remove this panel so that it will be reinserted at the front of the stack
+        modalPanels.removeAll(panel);
+    }
+
+    modalPanels.prepend(panel);
+
+    if (!hoverItems.isEmpty()) {
+        // send GraphicsSceneHoverLeave events to newly blocked hoverItems
+        QGraphicsSceneHoverEvent hoverEvent;
+        hoverEvent.setScenePos(lastSceneMousePos);
+        dispatchHoverEvent(&hoverEvent);
+    }
+
+    if (!mouseGrabberItems.isEmpty() && lastMouseGrabberItemHasImplicitMouseGrab) {
+        QGraphicsItem *item = mouseGrabberItems.last();
+        if (item->isBlockedByModalPanel())
+            ungrabMouse(item, /*itemIsDying =*/ false);
+    }
+
+    QEvent windowBlockedEvent(QEvent::WindowBlocked);
+    QEvent windowUnblockedEvent(QEvent::WindowUnblocked);
+    for (int i = 0; i < items.count(); ++i) {
+        QGraphicsItem *item = items.at(i);
+        if (item->isPanel()) {
+            if (!blockedPanels.contains(item) && item->isBlockedByModalPanel()) {
+                // send QEvent::WindowBlocked to newly blocked panels
+                sendEvent(item, &windowBlockedEvent);
+            } else if (blockedPanels.contains(item) && !item->isBlockedByModalPanel()) {
+                // send QEvent::WindowUnblocked to unblocked panels when downgrading
+                // a panel from SceneModal to PanelModal
+                sendEvent(item, &windowUnblockedEvent);
+            }
+        }
+    }
+}
+
+void QGraphicsScenePrivate::leaveModal(QGraphicsItem *panel)
+{
+    Q_Q(QGraphicsScene);
+    Q_ASSERT(panel && panel->isPanel());
+
+    QSet<QGraphicsItem *> blockedPanels;
+    QList<QGraphicsItem *> items = q->items(); // ### same as above
+    for (int i = 0; i < items.count(); ++i) {
+        QGraphicsItem *item = items.at(i);
+        if (item->isPanel() && item->isBlockedByModalPanel())
+            blockedPanels.insert(item);
+    }
+
+    modalPanels.removeAll(panel);
+
+    QEvent e(QEvent::WindowUnblocked);
+    for (int i = 0; i < items.count(); ++i) {
+        QGraphicsItem *item = items.at(i);
+        if (item->isPanel() && blockedPanels.contains(item) && !item->isBlockedByModalPanel())
+            sendEvent(item, &e);
+    }
+
+    // send GraphicsSceneHoverEnter events to newly unblocked items
+    QGraphicsSceneHoverEvent hoverEvent;
+    hoverEvent.setScenePos(lastSceneMousePos);
+    dispatchHoverEvent(&hoverEvent);
+}
+
 QT_END_NAMESPACE
 
 #include "moc_qgraphicsscene.cpp"