Scxmleditor: Add showing onEntry and on Exit events

This commit enhances the SCXML Editor by adding a new
feature that enables the display of onEntry and onExit
events in the state item. This feature provides developers
with a more comprehensive view of the state machine's behavior,
allowing them to better understand the transitions that occur
when entering or exiting a particular state.

Fixes: QTCREATORBUG-17378
Change-Id: Iaf84af209d9acf13bd4183f7da9acbcd6c1c8214
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

8 files changed, 228 insertions, 15 deletions

diff --git a/src/plugins/scxmleditor/CMakeLists.txt b/src/plugins/scxmleditor/CMakeLists.txt
index fef49a90827..358c407233c 100644
--- a/src/plugins/scxmleditor/CMakeLists.txt
+++ b/src/plugins/scxmleditor/CMakeLists.txt
@@ -42,6 +42,7 @@ add_qtc_plugin(ScxmlEditor
     plugin_interface/baseitem.cpp plugin_interface/baseitem.h
     plugin_interface/connectableitem.cpp plugin_interface/connectableitem.h
     plugin_interface/cornergrabberitem.cpp plugin_interface/cornergrabberitem.h
+    plugin_interface/eventitem.cpp plugin_interface/eventitem.h
     plugin_interface/finalstateitem.cpp plugin_interface/finalstateitem.h
     plugin_interface/genericscxmlplugin.cpp plugin_interface/genericscxmlplugin.h
     plugin_interface/graphicsitemprovider.h
diff --git a/src/plugins/scxmleditor/plugin_interface/baseitem.cpp b/src/plugins/scxmleditor/plugin_interface/baseitem.cpp
index 861094321aa..7d87a68f91c 100644
--- a/src/plugins/scxmleditor/plugin_interface/baseitem.cpp
+++ b/src/plugins/scxmleditor/plugin_interface/baseitem.cpp
@@ -41,7 +41,8 @@ BaseItem::~BaseItem()
 void BaseItem::checkParentBoundingRect()
 {
     BaseItem *parentBaseItem = this->parentBaseItem();
-    if (parentBaseItem && type() >= InitialStateType && !parentBaseItem->blockUpdates()) {
+    if ((parentBaseItem && type() >= InitialStateType && !parentBaseItem->blockUpdates())
+        || (parentBaseItem && type() == StateWarningType)) {
         auto parentStateItem = qgraphicsitem_cast<StateItem*>(parentBaseItem);
         if (parentStateItem && (parentStateItem->type() >= StateType))
             parentStateItem->updateBoundingRect();
diff --git a/src/plugins/scxmleditor/plugin_interface/baseitem.h b/src/plugins/scxmleditor/plugin_interface/baseitem.h
index 5c992c632b6..42f09ca3893 100644
--- a/src/plugins/scxmleditor/plugin_interface/baseitem.h
+++ b/src/plugins/scxmleditor/plugin_interface/baseitem.h
@@ -93,6 +93,7 @@ public:
     ScxmlUiFactory *uiFactory() const;
 
     virtual void updateUIProperties();
+    virtual void addChild(ScxmlTag */*tag*/) {};
 
 protected:
     virtual void updatePolygon();
diff --git a/src/plugins/scxmleditor/plugin_interface/eventitem.cpp b/src/plugins/scxmleditor/plugin_interface/eventitem.cpp
new file mode 100644
index 00000000000..f61517f7cf6
--- /dev/null
+++ b/src/plugins/scxmleditor/plugin_interface/eventitem.cpp
@@ -0,0 +1,108 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "eventitem.h"
+
+#include <QColor>
+#include <QFont>
+#include <QGraphicsItem>
+#include <QList>
+#include <QString>
+
+namespace ScxmlEditor {
+
+namespace PluginInterface {
+
+EventItem::EventItem(const QPointF &pos, BaseItem *parent)
+    : BaseItem(parent)
+{
+    m_eventNameItem = new TextItem(this);
+    m_eventNameItem->setParentItem(this);
+    QFont serifFont("Times", 13, QFont::Normal);
+    m_eventNameItem->setFont(serifFont);
+
+    QString color = editorInfo("fontColor");
+    m_eventNameItem->setDefaultTextColor(color.isEmpty() ? QColor(Qt::black) : QColor(color));
+
+    setPos(pos);
+    m_eventNameItem->setTextInteractionFlags(Qt::NoTextInteraction);
+    setItemBoundingRect(m_eventNameItem->boundingRect());
+}
+
+void EventItem::updateAttributes()
+{
+    QString text = "  " + tag()->tagName();
+    if (tag()->attributeNames().size() > 0) {
+        for (int i = 0; i < tag()->attributeNames().size(); ++i)
+            if (tag()->attributeNames().at(i) == "event") {
+                if (tag()->attributeValues().size() > i)
+                    text += " / " + tag()->attributeValues().at(i);
+                break;
+            }
+    }
+    m_eventNameItem->setText(text);
+    setItemBoundingRect(m_eventNameItem->boundingRect());
+}
+
+OnEntryExitItem::OnEntryExitItem(BaseItem *parent)
+    : BaseItem(parent)
+{
+    m_eventNameItem = new TextItem(this);
+    m_eventNameItem->setParentItem(this);
+    QFont serifFont("Times", 13, QFont::Normal);
+    m_eventNameItem->setFont(serifFont);
+    m_eventNameItem->setDefaultTextColor(Qt::black);
+    m_eventNameItem->setTextInteractionFlags(Qt::NoTextInteraction);
+}
+
+void OnEntryExitItem::updateAttributes()
+{
+    QString text = tag()->tagName();
+
+    m_eventNameItem->setText(text);
+    setItemBoundingRect(childBoundingRect());
+    checkParentBoundingRect();
+}
+
+void OnEntryExitItem::finalizeCreation()
+{
+    auto children = tag()->allChildren();
+    auto pos = m_eventNameItem->boundingRect().bottomLeft();
+    for (auto child : children) {
+        EventItem *item = new EventItem(pos, this);
+        item->setTag(child);
+        item->updateAttributes();
+        pos = item->pos() + item->boundingRect().bottomLeft();
+    }
+
+    setItemBoundingRect(childBoundingRect());
+}
+
+void OnEntryExitItem::addChild(ScxmlTag *tag)
+{
+    auto pos = childBoundingRect().bottomLeft();
+    EventItem *item = new EventItem(pos, this);
+    item->setTag(tag);
+    item->updateAttributes();
+
+    setItemBoundingRect(childBoundingRect());
+    checkParentBoundingRect();
+}
+
+QRectF OnEntryExitItem::childBoundingRect() const
+{
+    QRectF r = m_eventNameItem->boundingRect();
+
+    const QList<QGraphicsItem *> children = childItems();
+
+    for (const QGraphicsItem *child : children) {
+        QRectF br = child->boundingRect();
+        QPointF p = child->pos() + br.topLeft();
+        br.moveTopLeft(p);
+        r = r.united(br);
+    }
+    return r;
+}
+
+} // namespace PluginInterface
+} // namespace ScxmlEditor
diff --git a/src/plugins/scxmleditor/plugin_interface/eventitem.h b/src/plugins/scxmleditor/plugin_interface/eventitem.h
new file mode 100644
index 00000000000..cf8ff3a9e34
--- /dev/null
+++ b/src/plugins/scxmleditor/plugin_interface/eventitem.h
@@ -0,0 +1,41 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "baseitem.h"
+#include "textitem.h"
+
+namespace ScxmlEditor::PluginInterface {
+
+class EventItem : public BaseItem
+{
+public:
+    explicit EventItem(const QPointF &pos = QPointF(), BaseItem *parent = nullptr);
+
+    void updateAttributes() override;
+    void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) override {}
+
+private:
+    TextItem *m_eventNameItem;
+};
+
+class OnEntryExitItem : public BaseItem
+{
+public:
+    explicit OnEntryExitItem(BaseItem *parent = nullptr);
+
+    int type() const override { return StateWarningType; }
+
+    void updateAttributes() override;
+    void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) override {}
+    void finalizeCreation() override;
+    void addChild(ScxmlTag *tag) override;
+
+    QRectF childBoundingRect() const;
+
+private:
+    TextItem *m_eventNameItem;
+};
+
+} // namespace ScxmlEditor::PluginInterface
diff --git a/src/plugins/scxmleditor/plugin_interface/graphicsscene.cpp b/src/plugins/scxmleditor/plugin_interface/graphicsscene.cpp
index fb0e8252db9..94bd8b41edb 100644
--- a/src/plugins/scxmleditor/plugin_interface/graphicsscene.cpp
+++ b/src/plugins/scxmleditor/plugin_interface/graphicsscene.cpp
@@ -467,8 +467,7 @@ void GraphicsScene::endTagChange(ScxmlDocument::TagChange change, ScxmlTag *tag,
         break;
     }
     case ScxmlDocument::TagChangeParent: {
-        auto childItem = qobject_cast<ConnectableItem*>(findItem(tag));
-
+        auto childItem = findItem(tag);
         if (childItem) {
             QTC_ASSERT(tag, break);
             BaseItem *newParentItem = findItem(tag->parentTag());
@@ -485,8 +484,11 @@ void GraphicsScene::endTagChange(ScxmlDocument::TagChange change, ScxmlTag *tag,
 
             childItem->setParentItem(newParentItem);
             childItem->updateUIProperties();
-            childItem->updateTransitions(true);
-            childItem->updateTransitionAttributes(true);
+            if (auto childConItem = qobject_cast<ConnectableItem*>(findItem(tag))) {
+                childConItem->updateTransitions(true);
+                childConItem->updateTransitionAttributes(true);
+            }
+
             childItem->checkWarnings();
             childItem->checkInitial();
             if (newParentItem) {
@@ -495,6 +497,8 @@ void GraphicsScene::endTagChange(ScxmlDocument::TagChange change, ScxmlTag *tag,
                 newParentItem->checkWarnings();
                 newParentItem->checkOverlapping();
                 newParentItem->updateUIProperties();
+                if (auto newConItem = qobject_cast<StateItem*>(newParentItem))
+                    newConItem->updateBoundingRect();
             }
 
             if (oldParentItem)
@@ -549,6 +553,9 @@ void GraphicsScene::endTagChange(ScxmlDocument::TagChange change, ScxmlTag *tag,
             }
 
             if (parentItem) {
+                if (childItem == nullptr)
+                    parentItem->addChild(childTag);
+
                 parentItem->updateAttributes();
                 parentItem->updateUIProperties();
                 parentItem->checkInitial();
diff --git a/src/plugins/scxmleditor/plugin_interface/stateitem.cpp b/src/plugins/scxmleditor/plugin_interface/stateitem.cpp
index dd1015f9d40..e53bd8c894e 100644
--- a/src/plugins/scxmleditor/plugin_interface/stateitem.cpp
+++ b/src/plugins/scxmleditor/plugin_interface/stateitem.cpp
@@ -1,19 +1,18 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#include "finalstateitem.h"
+#include "stateitem.h"
+
+#include "eventitem.h"
 #include "graphicsitemprovider.h"
 #include "graphicsscene.h"
 #include "idwarningitem.h"
 #include "imageprovider.h"
-#include "initialstateitem.h"
-#include "parallelitem.h"
 #include "sceneutils.h"
 #include "scxmleditorconstants.h"
 #include "scxmleditortr.h"
 #include "scxmltagutils.h"
 #include "scxmluifactory.h"
-#include "stateitem.h"
 #include "statewarningitem.h"
 #include "textitem.h"
 #include "transitionitem.h"
@@ -28,6 +27,7 @@
 #include <QTextOption>
 #include <QUndoStack>
 #include <QtMath>
+#include <QRubberBand>
 
 using namespace ScxmlEditor::PluginInterface;
 
@@ -171,6 +171,7 @@ void StateItem::updateBoundingRect()
 
     // Check if we need to increase parent boundingrect
     if (!r2.isNull()) {
+        positionOnExitItems();
         QRectF r = boundingRect();
         QRectF r3 = r.united(r2);
 
@@ -244,7 +245,6 @@ void StateItem::transitionCountChanged()
 QRectF StateItem::childItemsBoundingRect() const
 {
     QRectF r;
-    QRectF rr = boundingRect();
 
     QList<QGraphicsItem*> children = childItems();
     for (int i = 0; i < children.count(); ++i) {
@@ -256,15 +256,26 @@ QRectF StateItem::childItemsBoundingRect() const
         }
     }
 
+    if (m_onEntryItem) {
+        QRectF br = m_onEntryItem->childBoundingRect();
+        QPointF p = m_onEntryItem->pos() + br.topLeft();
+        br.moveTopLeft(p);
+        r = r.united(br);
+    }
+
+    if (m_onExitItem) {
+        QRectF br = m_onExitItem->childBoundingRect();
+        QPointF p = m_onExitItem->pos() + br.topLeft();
+        br.moveTopLeft(p);
+        r = r.united(br);
+    }
+
     if (m_transitionRect.isValid()) {
         r.setLeft(r.left() - m_transitionRect.width());
         r.setHeight(qMax(r.height(), m_transitionRect.height()));
         r.moveBottom(qMax(r.bottom(), m_transitionRect.bottom()));
     }
 
-    if (!r.isNull())
-        r.adjust(-20, -(rr.height() * 0.06 + 40), 20, 20);
-
     return r;
 }
 
@@ -418,11 +429,18 @@ void StateItem::updatePolygon()
               << m_drawingRect.bottomLeft()
               << m_drawingRect.topLeft();
 
-    m_titleRect = QRectF(m_drawingRect.left(), m_drawingRect.top(), m_drawingRect.width(), TEXT_ITEM_HEIGHT + m_drawingRect.height() * 0.06);
+    m_titleRect = QRectF(m_drawingRect.left(),
+                         m_drawingRect.top(),
+                         m_drawingRect.width(),
+                         TEXT_ITEM_HEIGHT + m_drawingRect.height() * 0.06);
     QFont f = m_stateNameItem->font();
     f.setPixelSize(m_titleRect.height() * 0.65);
     m_stateNameItem->setFont(f);
 
+    if (m_onEntryItem)
+        m_onEntryItem->setPos(m_titleRect.x(), m_titleRect.bottom());
+    positionOnExitItems();
+
     updateTextPositions();
 }
 
@@ -517,13 +535,41 @@ void StateItem::init(ScxmlTag *tag, BaseItem *parentItem, bool initChildren, boo
             if (newItem) {
                 newItem->init(child, this, initChildren, blockUpdates);
                 newItem->finalizeCreation();
-            }
+            } else
+                addChild(child);
         }
     }
     if (blockUpdates)
         setBlockUpdates(false);
 }
 
+
+void StateItem::addChild(ScxmlTag *child)
+{
+    if (child->tagName() == "onentry") {
+        OnEntryExitItem *item = new OnEntryExitItem(this);
+        m_onEntryItem = item;
+        item->setTag(child);
+        item->finalizeCreation();
+        item->updateAttributes();
+        m_onEntryItem->setPos(m_titleRect.x(), m_titleRect.bottom());
+    } else if (child->tagName() == "onexit") {
+        OnEntryExitItem *item = new OnEntryExitItem(this);
+        m_onExitItem = item;
+        item->setTag(child);
+        item->finalizeCreation();
+        item->updateAttributes();
+        positionOnExitItems();
+    }
+}
+
+void StateItem::positionOnExitItems()
+{
+    int offset = m_onEntryItem ? m_onEntryItem->boundingRect().height() : 0;
+    if (m_onExitItem)
+        m_onExitItem->setPos(m_titleRect.x(), m_titleRect.bottom() + offset);
+}
+
 QString StateItem::itemId() const
 {
     return m_stateNameItem ? m_stateNameItem->toPlainText() : QString();
diff --git a/src/plugins/scxmleditor/plugin_interface/stateitem.h b/src/plugins/scxmleditor/plugin_interface/stateitem.h
index 585992f040e..beaebe9ebd7 100644
--- a/src/plugins/scxmleditor/plugin_interface/stateitem.h
+++ b/src/plugins/scxmleditor/plugin_interface/stateitem.h
@@ -4,7 +4,9 @@
 #pragma once
 
 #include "connectableitem.h"
+#include "textitem.h"
 #include <QPen>
+#include <QStyleOptionGraphicsItem>
 
 QT_FORWARD_DECLARE_CLASS(QGraphicsSceneMouseEvent)
 
@@ -16,6 +18,7 @@ class TransitionItem;
 class TextItem;
 class IdWarningItem;
 class StateWarningItem;
+class OnEntryExitItem;
 
 /**
  * @brief The StateItem class represents the SCXML-State.
@@ -49,6 +52,8 @@ public:
     QRectF childItemsBoundingRect() const;
     void connectToParent(BaseItem *parentItem) override;
 
+    void addChild(ScxmlTag *child) override;
+
 protected:
     void updatePolygon() override;
     void transitionsChanged() override;
@@ -69,6 +74,7 @@ private:
     void updateTextPositions();
     void checkParentBoundingRect();
     void checkWarningItems();
+    void positionOnExitItems();
 
     TextItem *m_stateNameItem;
     StateWarningItem *m_stateWarningItem = nullptr;
@@ -76,6 +82,8 @@ private:
     QPen m_pen;
     bool m_initial = false;
     bool m_parallelState = false;
+    QPointer<OnEntryExitItem> m_onEntryItem;
+    QPointer<OnEntryExitItem> m_onExitItem;
     QImage m_backgroundImage;
 };