QmlDesigner: Implement transition tool

Implementing a custom tool to create transitions in flows.

Change-Id: I721895c67084707bea8504c657ec9af2b5df2c22
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

6 files changed, 545 insertions, 2 deletions

diff --git a/src/plugins/qmldesigner/CMakeLists.txt b/src/plugins/qmldesigner/CMakeLists.txt
index 42feb7c13f..f6ac481714 100644
--- a/src/plugins/qmldesigner/CMakeLists.txt
+++ b/src/plugins/qmldesigner/CMakeLists.txt
@@ -243,6 +243,7 @@ extend_qtc_plugin(QmlDesigner
     snapper.cpp snapper.h
     snappinglinecreator.cpp snappinglinecreator.h
     toolbox.cpp toolbox.h
+    transitiontool.cpp transitiontool.h
 )
 
 extend_qtc_plugin(QmlDesigner
diff --git a/src/plugins/qmldesigner/components/formeditor/formeditor.pri b/src/plugins/qmldesigner/components/formeditor/formeditor.pri
index 3464ba3afe..4609b277f9 100644
--- a/src/plugins/qmldesigner/components/formeditor/formeditor.pri
+++ b/src/plugins/qmldesigner/components/formeditor/formeditor.pri
@@ -36,7 +36,8 @@ SOURCES += formeditoritem.cpp \
     contentnoteditableindicator.cpp \
     backgroundaction.cpp \
     formeditortoolbutton.cpp \
-    formeditorannotationicon.cpp
+    formeditorannotationicon.cpp \
+    transitiontool.cpp
 
 HEADERS += formeditorscene.h \
     formeditorwidget.h \
@@ -75,6 +76,7 @@ HEADERS += formeditorscene.h \
     contentnoteditableindicator.h \
     backgroundaction.h \
     formeditortoolbutton.h \
-    formeditorannotationicon.h
+    formeditorannotationicon.h \
+    transitiontool.h
 
 RESOURCES += formeditor.qrc
diff --git a/src/plugins/qmldesigner/components/formeditor/transitiontool.cpp b/src/plugins/qmldesigner/components/formeditor/transitiontool.cpp
new file mode 100644
index 0000000000..b1cee8c443
--- /dev/null
+++ b/src/plugins/qmldesigner/components/formeditor/transitiontool.cpp
@@ -0,0 +1,438 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "transitiontool.h"
+
+#include <formeditorscene.h>
+#include <formeditorview.h>
+#include <formeditorwidget.h>
+#include <itemutilfunctions.h>
+#include <formeditoritem.h>
+#include <layeritem.h>
+
+#include <resizehandleitem.h>
+
+#include <bindingproperty.h>
+#include <nodeabstractproperty.h>
+#include <nodelistproperty.h>
+#include <nodemetainfo.h>
+#include <qmlitemnode.h>
+#include <qmldesignerplugin.h>
+#include <abstractaction.h>
+#include <designeractionmanager.h>
+#include <variantproperty.h>
+#include <rewritingexception.h>
+#include <rewritertransaction.h>
+
+#include <coreplugin/icore.h>
+#include <utils/qtcassert.h>
+
+#include <QApplication>
+#include <QGraphicsSceneMouseEvent>
+#include <QAction>
+#include <QMessageBox>
+#include <QPair>
+#include <QGraphicsSceneMouseEvent>
+
+namespace QmlDesigner {
+
+static bool isTransitionSource(const ModelNode &node)
+{
+    return QmlFlowTargetNode::isFlowEditorTarget(node);
+}
+
+static bool isTransitionTarget(const QmlItemNode &node)
+{
+    return QmlFlowTargetNode::isFlowEditorTarget(node)
+            && !node.isFlowActionArea()
+            && !node.isFlowWildcard();
+}
+
+class TransitionToolAction : public AbstractAction
+{
+public:
+    TransitionToolAction(const QString &name) : AbstractAction(name) {}
+
+    QByteArray category() const override
+    {
+        return QByteArray();
+    }
+
+    QByteArray menuId() const override
+    {
+        return "TransitionTool";
+    }
+
+    int priority() const override
+    {
+        return CustomActionsPriority;
+    }
+
+    Type type() const override
+    {
+        return ContextMenuAction;
+    }
+
+protected:
+    bool isVisible(const SelectionContext &selectionContext) const override
+    {
+        if (selectionContext.scenePosition().isNull())
+            return false;
+
+        if (selectionContext.singleNodeIsSelected())
+            return isTransitionSource(selectionContext.currentSingleSelectedNode());
+
+        return false;
+    }
+
+    bool isEnabled(const SelectionContext &selectionContext) const override
+    {
+        return isVisible(selectionContext);
+    }
+};
+
+class TransitionCustomAction : public TransitionToolAction
+{
+public:
+    TransitionCustomAction(const QString &name) : TransitionToolAction(name) {}
+
+    QByteArray category() const override
+    {
+        return ComponentCoreConstants::flowCategory;
+    }
+
+    SelectionContext selectionContext() const
+    {
+        return AbstractAction::selectionContext();
+    }
+
+};
+
+static QRectF paintedBoundingRect(FormEditorItem *item)
+{
+    QRectF boundingRect = item->qmlItemNode().instanceBoundingRect();
+    if (boundingRect.width() < 4)
+        boundingRect = item->boundingRect();
+    return boundingRect;
+}
+
+static QPointF centerPoint(FormEditorItem *item)
+{
+     QRectF boundingRect = paintedBoundingRect(item);
+     return QPointF(item->scenePos().x() + boundingRect.width() / 2,
+                    item->scenePos().y() + boundingRect.height() / 2);
+}
+
+void static setToBoundingRect(QGraphicsRectItem *rect, FormEditorItem *item)
+{
+    QPolygonF boundingRectInSceneSpace(item->mapToScene(paintedBoundingRect(item)));
+    rect->setRect(boundingRectInSceneSpace.boundingRect());
+}
+
+TransitionTool::TransitionTool()
+    : QObject(), AbstractCustomTool()
+{
+
+    TransitionToolAction *transitionToolAction = new TransitionToolAction(tr("Add Transition"));
+    QmlDesignerPlugin::instance()->designerActionManager().addDesignerAction(transitionToolAction);
+
+    connect(transitionToolAction->action(), &QAction::triggered,
+            this, &TransitionTool::activateTool);
+
+    TransitionCustomAction *removeAction = new TransitionCustomAction(tr("Remove Transitions"));
+    QmlDesignerPlugin::instance()->designerActionManager().addDesignerAction(removeAction);
+
+    connect(removeAction->action(), &QAction::triggered,
+            this, [removeAction](){
+
+        SelectionContext context = removeAction->selectionContext();
+        QmlFlowTargetNode node = QmlFlowTargetNode(context.currentSingleSelectedNode());
+
+        context.view()->executeInTransaction("Remove Transitions", [&node](){
+            if (node.isValid())
+                node.removeTransitions();
+        });
+    });
+
+    TransitionCustomAction *removeAllTransitionsAction = new TransitionCustomAction(tr("Remove All Transitions"));
+    QmlDesignerPlugin::instance()->designerActionManager().addDesignerAction(removeAllTransitionsAction);
+
+    connect(removeAllTransitionsAction->action(), &QAction::triggered,
+            this, [removeAllTransitionsAction](){
+
+        if (QMessageBox::question(Core::ICore::dialogParent(),
+                                  tr("Remove All Transitions"),
+                                  tr("Do you really want to remove all transitions?"),
+                                  QMessageBox::Yes | QMessageBox::No) !=  QMessageBox::Yes)
+            return;
+
+        SelectionContext context = removeAllTransitionsAction->selectionContext();
+        QmlFlowTargetNode node = QmlFlowTargetNode(context.currentSingleSelectedNode());
+
+        context.view()->executeInTransaction("Remove All Transitions", [&node](){
+            if (node.isValid() && node.flowView().isValid())
+                node.flowView().removeAllTransitions();
+        });
+    });
+
+    TransitionCustomAction *removeDanglingTransitionAction = new TransitionCustomAction(tr("Remove Dangling Transitions"));
+    QmlDesignerPlugin::instance()->designerActionManager().addDesignerAction(removeDanglingTransitionAction);
+
+    connect(removeDanglingTransitionAction->action(), &QAction::triggered,
+            this, [removeDanglingTransitionAction](){
+
+        SelectionContext context = removeDanglingTransitionAction->selectionContext();
+        QmlFlowTargetNode node = QmlFlowTargetNode(context.currentSingleSelectedNode());
+
+        context.view()->executeInTransaction("Remove Dangling Transitions", [&node](){
+            if (node.isValid() && node.flowView().isValid())
+                node.flowView().removeDanglingTransitions();
+        });
+    });
+}
+
+TransitionTool::~TransitionTool()
+{
+}
+
+void TransitionTool::clear()
+{
+    m_lineItem.reset(nullptr);
+    m_rectangleItem1.reset(nullptr);
+    m_rectangleItem2.reset(nullptr);
+
+    AbstractFormEditorTool::clear();
+}
+
+void TransitionTool::mousePressEvent(const QList<QGraphicsItem*> &itemList,
+                                            QGraphicsSceneMouseEvent *event)
+{
+    if (m_block)
+        return;
+
+    if (event->button() != Qt::LeftButton)
+        return;
+
+    AbstractFormEditorTool::mousePressEvent(itemList, event);
+    TransitionTool::mouseMoveEvent(itemList, event);
+}
+
+void TransitionTool::mouseMoveEvent(const QList<QGraphicsItem*> & itemList,
+                              QGraphicsSceneMouseEvent * event)
+{
+    if (!m_lineItem)
+        return;
+
+    QTC_ASSERT(currentFormEditorItem(), return);
+
+    const QPointF pos = centerPoint(m_formEditorItem);
+    lineItem()->setLine(pos.x(),
+                        pos.y(),
+                       event->scenePos().x(),
+                       event->scenePos().y());
+
+    FormEditorItem *formEditorItem = nearestFormEditorItem(event->scenePos(), itemList);
+
+    if (formEditorItem
+            && formEditorItem->qmlItemNode().isValid()
+            && isTransitionTarget(formEditorItem->qmlItemNode().modelNode())) {
+        rectangleItem2()->setVisible(true);
+        setToBoundingRect(rectangleItem2(), formEditorItem);
+    } else {
+        rectangleItem2()->setVisible(false);
+    }
+}
+
+void TransitionTool::hoverMoveEvent(const QList<QGraphicsItem*> & itemList,
+                        QGraphicsSceneMouseEvent *event)
+{
+    mouseMoveEvent(itemList, event);
+}
+
+void TransitionTool::keyPressEvent(QKeyEvent * /*keyEvent*/)
+{
+}
+
+void TransitionTool::keyReleaseEvent(QKeyEvent * /*keyEvent*/)
+{
+    view()->changeToSelectionTool();
+}
+
+void  TransitionTool::dragLeaveEvent(const QList<QGraphicsItem*> &/*itemList*/, QGraphicsSceneDragDropEvent * /*event*/)
+{
+}
+
+void  TransitionTool::dragMoveEvent(const QList<QGraphicsItem*> &/*itemList*/, QGraphicsSceneDragDropEvent * /*event*/)
+{
+}
+
+void TransitionTool::mouseReleaseEvent(const QList<QGraphicsItem*> &itemList,
+                                 QGraphicsSceneMouseEvent *event)
+{
+    if (m_block)
+        return;
+
+    if (event->button() == Qt::LeftButton) {
+        FormEditorItem *formEditorItem = nearestFormEditorItem(event->scenePos(), itemList);
+
+        if (formEditorItem
+                && QmlFlowTargetNode(formEditorItem->qmlItemNode().modelNode()).isValid())
+            createTransition(m_formEditorItem, formEditorItem);
+    }
+
+    view()->changeToSelectionTool();
+}
+
+
+void TransitionTool::mouseDoubleClickEvent(const QList<QGraphicsItem*> &itemList, QGraphicsSceneMouseEvent *event)
+{
+    AbstractFormEditorTool::mouseDoubleClickEvent(itemList, event);
+}
+
+void TransitionTool::itemsAboutToRemoved(const QList<FormEditorItem*> &)
+{
+    view()->changeCurrentToolTo(this);
+}
+
+void TransitionTool::selectedItemsChanged(const QList<FormEditorItem*> &itemList)
+{
+    if (!itemList.isEmpty()) {
+        createItems();
+
+        m_formEditorItem = itemList.first();
+        setToBoundingRect(rectangleItem1(), m_formEditorItem);
+    }
+}
+
+void TransitionTool::instancesCompleted(const QList<FormEditorItem*> & /*itemList*/)
+{
+}
+
+void  TransitionTool::instancesParentChanged(const QList<FormEditorItem *> & /*itemList*/)
+{
+}
+
+void TransitionTool::instancePropertyChange(const QList<QPair<ModelNode, PropertyName> > & /*propertyList*/)
+{
+}
+
+void TransitionTool::formEditorItemsChanged(const QList<FormEditorItem*> & /*itemList*/)
+{
+}
+
+int TransitionTool::wantHandleItem(const ModelNode &modelNode) const
+{
+    if (isTransitionSource(modelNode))
+        return 10;
+
+    return 0;
+}
+
+QString TransitionTool::name() const
+{
+    return tr("Transition Tool");
+}
+
+void TransitionTool::activateTool()
+{
+    view()->changeToCustomTool();
+}
+
+void TransitionTool::unblock()
+{
+    m_block = false;
+}
+
+QGraphicsLineItem *TransitionTool::lineItem()
+{
+    return m_lineItem.get();
+}
+
+QGraphicsRectItem *TransitionTool::rectangleItem1()
+{
+    return m_rectangleItem1.get();
+}
+
+QGraphicsRectItem *TransitionTool::rectangleItem2()
+{
+    return m_rectangleItem2.get();
+}
+
+FormEditorItem *TransitionTool::currentFormEditorItem() const
+{
+    if (scene()->items().contains(m_formEditorItem))
+        return m_formEditorItem;
+
+    return nullptr;
+}
+
+void TransitionTool::createItems() {
+    m_block = true;
+    QTimer::singleShot(200, this, [this](){ unblock(); });
+
+    if (!lineItem())
+        m_lineItem.reset(new QGraphicsLineItem(scene()->manipulatorLayerItem()));
+
+    if (!rectangleItem1())
+        m_rectangleItem1.reset(new QGraphicsRectItem(scene()->manipulatorLayerItem()));
+
+    if (!rectangleItem2())
+        m_rectangleItem2.reset(new QGraphicsRectItem(scene()->manipulatorLayerItem()));
+
+    m_rectangleItem2->setVisible(false);
+
+    QPen pen;
+    pen.setColor(QColor(Qt::lightGray));
+    pen.setStyle(Qt::DashLine);
+    pen.setWidth(0);
+    m_lineItem->setPen(pen);
+
+    pen.setColor(QColor(108, 141, 221));
+    pen.setStyle(Qt::SolidLine);
+    pen.setWidth(4);
+    pen.setCosmetic(true);
+    m_rectangleItem1->setPen(pen);
+
+    m_rectangleItem2->setPen(pen);
+}
+
+void TransitionTool::createTransition(FormEditorItem *source, FormEditorItem *target)
+{
+    QmlFlowTargetNode sourceNode(source->qmlItemNode().modelNode());
+    QmlFlowTargetNode targetNode(target->qmlItemNode().modelNode());
+
+    if (sourceNode.isValid() && targetNode.isValid()
+            && sourceNode != targetNode
+            && !targetNode.isFlowActionArea()
+            && !targetNode.isFlowWildcard()) {
+        view()->executeInTransaction("create transition", [&sourceNode, targetNode](){
+            sourceNode.assignTargetItem(targetNode);
+        });
+    } else {
+        qWarning() << Q_FUNC_INFO << "nodes invalid";
+    }
+}
+
+}
diff --git a/src/plugins/qmldesigner/components/formeditor/transitiontool.h b/src/plugins/qmldesigner/components/formeditor/transitiontool.h
new file mode 100644
index 0000000000..6efa1d177a
--- /dev/null
+++ b/src/plugins/qmldesigner/components/formeditor/transitiontool.h
@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+#pragma once
+
+#include "abstractcustomtool.h"
+#include "selectionindicator.h"
+
+#include <QGraphicsLineItem>
+#include <QHash>
+#include <QPointer>
+
+#include <memory>
+
+namespace QmlDesigner {
+
+class TransitionTool : public QObject, public AbstractCustomTool
+{
+    Q_OBJECT
+public:
+    TransitionTool();
+    ~TransitionTool();
+
+    void mousePressEvent(const QList<QGraphicsItem*> &itemList,
+                         QGraphicsSceneMouseEvent *event) override;
+    void mouseMoveEvent(const QList<QGraphicsItem*> &itemList,
+                        QGraphicsSceneMouseEvent *event) override;
+    void mouseReleaseEvent(const QList<QGraphicsItem*> &itemList,
+                           QGraphicsSceneMouseEvent *event) override;
+    void mouseDoubleClickEvent(const QList<QGraphicsItem*> &itemList,
+                               QGraphicsSceneMouseEvent *event) override;
+    void hoverMoveEvent(const QList<QGraphicsItem*> &itemList,
+                        QGraphicsSceneMouseEvent *event) override;
+    void keyPressEvent(QKeyEvent *event) override;
+    void keyReleaseEvent(QKeyEvent *keyEvent) override;
+
+    void dragLeaveEvent(const QList<QGraphicsItem*> &itemList,
+                        QGraphicsSceneDragDropEvent * event) override;
+    void dragMoveEvent(const QList<QGraphicsItem*> &itemList,
+                       QGraphicsSceneDragDropEvent * event) override;
+
+    void itemsAboutToRemoved(const QList<FormEditorItem*> &itemList) override;
+
+    void selectedItemsChanged(const QList<FormEditorItem*> &itemList) override;
+
+    void instancesCompleted(const QList<FormEditorItem*> &itemList) override;
+    void instancesParentChanged(const QList<FormEditorItem *> &itemList) override;
+    void instancePropertyChange(const QList<QPair<ModelNode, PropertyName> > &propertyList) override;
+
+    void clear() override;
+
+    void formEditorItemsChanged(const QList<FormEditorItem*> &itemList) override;
+
+    int wantHandleItem(const ModelNode &modelNode) const override;
+
+    QString name() const override;
+
+    void activateTool();
+    void unblock();
+
+    QGraphicsLineItem *lineItem();
+    QGraphicsRectItem *rectangleItem1();
+    QGraphicsRectItem *rectangleItem2();
+
+private:
+    FormEditorItem *currentFormEditorItem() const;
+    void createItems();
+    void createTransition(FormEditorItem *item1, FormEditorItem *item2);
+
+    FormEditorItem* m_formEditorItem;
+    std::unique_ptr<QGraphicsLineItem> m_lineItem;
+    std::unique_ptr<QGraphicsRectItem> m_rectangleItem1;
+    std::unique_ptr<QGraphicsRectItem> m_rectangleItem2;
+    bool m_block = true;
+};
+
+} //QmlDesigner
diff --git a/src/plugins/qmldesigner/qmldesignerplugin.cpp b/src/plugins/qmldesigner/qmldesignerplugin.cpp
index a65ff3600b..5fd0b7990d 100644
--- a/src/plugins/qmldesigner/qmldesignerplugin.cpp
+++ b/src/plugins/qmldesigner/qmldesignerplugin.cpp
@@ -38,6 +38,7 @@
 #include <sourcetool/sourcetool.h>
 #include <colortool/colortool.h>
 #include <annotationeditor/annotationtool.h>
+#include <formeditor/transitiontool.h>
 #include <texttool/texttool.h>
 #include <timelineeditor/timelineview.h>
 #include <pathtool/pathtool.h>
@@ -242,6 +243,7 @@ bool QmlDesignerPlugin::delayedInitialize()
     d->viewManager.registerFormEditorToolTakingOwnership(new QmlDesigner::AnnotationTool);
     d->viewManager.registerFormEditorToolTakingOwnership(new QmlDesigner::TextTool);
     d->viewManager.registerFormEditorToolTakingOwnership(new QmlDesigner::PathTool);
+    d->viewManager.registerFormEditorToolTakingOwnership(new QmlDesigner::TransitionTool);
 
     return true;
 }
diff --git a/src/plugins/qmldesigner/qmldesignerplugin.qbs b/src/plugins/qmldesigner/qmldesignerplugin.qbs
index 3c434788cd..c69f5e5c22 100644
--- a/src/plugins/qmldesigner/qmldesignerplugin.qbs
+++ b/src/plugins/qmldesigner/qmldesignerplugin.qbs
@@ -530,6 +530,8 @@ Project {
                 "formeditor/toolbox.h",
                 "formeditor/formeditortoolbutton.cpp",
                 "formeditor/formeditortoolbutton.h",
+                "formeditor/transitiontool.cpp",
+                "formeditor/transitiontool.h",
                 "importmanager/importlabel.cpp",
                 "importmanager/importlabel.h",
                 "importmanager/importmanagercombobox.cpp",