From 20e95f2f197d4941675e34e6999d804396e1b7ec Mon Sep 17 00:00:00 2001
From: Knud Dollereder <knud.dollereder@qt.io>
Date: Tue, 24 Mar 2020 15:05:28 +0100
Subject: [PATCH] Add the ability to unify keyframe handles

Task-number: QDS-568
Change-Id: I5b102423e8e166d41edf199c42305cee102e8b54
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
---
 .../components/curveeditor/animationcurve.cpp | 21 ++++++++
 .../components/curveeditor/animationcurve.h   |  4 ++
 .../components/curveeditor/curveeditor.cpp    |  4 ++
 .../components/curveeditor/curveeditorstyle.h |  3 ++
 .../components/curveeditor/curvesegment.cpp   |  2 +
 .../curveeditor/detail/curveitem.cpp          | 20 ++++++--
 .../components/curveeditor/detail/curveitem.h |  7 +++
 .../curveeditor/detail/graphicsscene.cpp      | 36 +++++++++++---
 .../curveeditor/detail/graphicsscene.h        |  4 ++
 .../curveeditor/detail/graphicsview.cpp       | 16 ++++++
 .../curveeditor/detail/graphicsview.h         |  2 +
 .../curveeditor/detail/handleitem.cpp         |  2 +-
 .../curveeditor/detail/keyframeitem.cpp       | 49 ++++++++++++++++---
 .../curveeditor/detail/keyframeitem.h         |  8 ++-
 .../components/curveeditor/keyframe.cpp       | 14 ++++++
 .../components/curveeditor/keyframe.h         |  6 +++
 .../components/curveeditor/treeitem.cpp       | 10 ++++
 .../components/curveeditor/treeitem.h         |  4 ++
 .../animationcurveeditormodel.cpp             | 13 +++++
 .../timelineeditor/timelinetoolbar.cpp        |  5 --
 .../timelineeditor/timelinetoolbar.h          |  2 -
 .../timelineeditor/timelinewidget.cpp         |  5 ++
 22 files changed, 207 insertions(+), 30 deletions(-)

diff --git a/src/plugins/qmldesigner/components/curveeditor/animationcurve.cpp b/src/plugins/qmldesigner/components/curveeditor/animationcurve.cpp
index 5a849316b0b..237d89dcb20 100644
--- a/src/plugins/qmldesigner/components/curveeditor/animationcurve.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/animationcurve.cpp
@@ -103,6 +103,15 @@ bool AnimationCurve::isFromData() const
     return m_fromData;
 }
 
+bool AnimationCurve::hasUnified() const
+{
+    for (auto &&frame : m_frames) {
+        if (frame.isUnified())
+            return true;
+    }
+    return false;
+}
+
 double AnimationCurve::minimumTime() const
 {
     if (!m_frames.empty())
@@ -144,6 +153,18 @@ std::string AnimationCurve::string() const
     return sstream.str();
 }
 
+QString AnimationCurve::unifyString() const
+{
+    QString out;
+    for (auto &&frame : m_frames) {
+        if (frame.isUnified())
+            out.append("1");
+        else
+            out.append("0");
+    }
+    return out;
+}
+
 CurveSegment AnimationCurve::segment(double time) const
 {
     CurveSegment seg;
diff --git a/src/plugins/qmldesigner/components/curveeditor/animationcurve.h b/src/plugins/qmldesigner/components/curveeditor/animationcurve.h
index 3122074bfe9..d8ea0d628f4 100644
--- a/src/plugins/qmldesigner/components/curveeditor/animationcurve.h
+++ b/src/plugins/qmldesigner/components/curveeditor/animationcurve.h
@@ -50,6 +50,8 @@ public:
 
     bool isFromData() const;
 
+    bool hasUnified() const;
+
     double minimumTime() const;
 
     double maximumTime() const;
@@ -60,6 +62,8 @@ public:
 
     std::string string() const;
 
+    QString unifyString() const;
+
     CurveSegment segment(double time) const;
 
     std::vector<CurveSegment> segments() const;
diff --git a/src/plugins/qmldesigner/components/curveeditor/curveeditor.cpp b/src/plugins/qmldesigner/components/curveeditor/curveeditor.cpp
index 84788fbdead..33618dcc8d1 100644
--- a/src/plugins/qmldesigner/components/curveeditor/curveeditor.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/curveeditor.cpp
@@ -86,6 +86,7 @@ QToolBar *CurveEditor::createToolBar(CurveEditorModel *model)
     QAction *tangentStepAction = bar->addAction(QIcon(":/curveeditor/images/tangetToolsStepIcon.png"), "Step");
     QAction *tangentSplineAction = bar->addAction(QIcon(":/curveeditor/images/tangetToolsSplineIcon.png"), "Spline");
     QAction *tangentDefaultAction = bar->addAction("Set Default");
+    QAction *tangentUnifyAction = bar->addAction("Unify");
 
     auto setLinearInterpolation = [this]() {
         m_view->setInterpolation(Keyframe::Interpolation::Linear);
@@ -97,9 +98,12 @@ QToolBar *CurveEditor::createToolBar(CurveEditorModel *model)
         m_view->setInterpolation(Keyframe::Interpolation::Bezier);
     };
 
+    auto toggleUnifyKeyframe = [this]() { m_view->toggleUnified(); };
+
     connect(tangentLinearAction, &QAction::triggered, setLinearInterpolation);
     connect(tangentStepAction, &QAction::triggered, setStepInterpolation);
     connect(tangentSplineAction, &QAction::triggered, setSplineInterpolation);
+    connect(tangentUnifyAction, &QAction::triggered, toggleUnifyKeyframe);
 
     Q_UNUSED(tangentLinearAction);
     Q_UNUSED(tangentSplineAction);
diff --git a/src/plugins/qmldesigner/components/curveeditor/curveeditorstyle.h b/src/plugins/qmldesigner/components/curveeditor/curveeditorstyle.h
index 6dc4394647b..132a95a790e 100644
--- a/src/plugins/qmldesigner/components/curveeditor/curveeditorstyle.h
+++ b/src/plugins/qmldesigner/components/curveeditor/curveeditorstyle.h
@@ -62,6 +62,9 @@ struct KeyframeItemStyleOption
     double size = 10.0;
     QColor color = QColor(200, 200, 0);
     QColor selectionColor = QColor(200, 200, 200);
+    QColor lockedColor = QColor(50, 50, 50);
+    QColor unifiedColor = QColor(250, 50, 250);
+    QColor splitColor = QColor(0, 250, 0);
 };
 
 struct CurveItemStyleOption
diff --git a/src/plugins/qmldesigner/components/curveeditor/curvesegment.cpp b/src/plugins/qmldesigner/components/curveeditor/curvesegment.cpp
index 26a1dffc3ee..a4d1ea83d07 100644
--- a/src/plugins/qmldesigner/components/curveeditor/curvesegment.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/curvesegment.cpp
@@ -447,9 +447,11 @@ std::array<Keyframe, 3> CurveSegment::splitAt(double time)
 
             out[0].setInterpolation(left().interpolation());
             out[0].setData(left().data());
+            out[0].setUnified(left().isUnified());
 
             out[2].setInterpolation(right().interpolation());
             out[2].setData(right().data());
+            out[2].setUnified(right().isUnified());
             return out;
         }
     }
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.cpp b/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.cpp
index 2aa66b0f80e..9489928d074 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.cpp
@@ -297,6 +297,8 @@ void CurveItem::setCurve(const AnimationCurve &curve)
         item->setComponentTransform(m_transform);
         m_keyframes.push_back(item);
         QObject::connect(item, &KeyframeItem::redrawCurve, this, &CurveItem::emitCurveChanged);
+        QObject::connect(item, &KeyframeItem::keyframeMoved, this, &CurveItem::keyframeMoved);
+        QObject::connect(item, &KeyframeItem::handleMoved, this, &CurveItem::handleMoved);
     }
 
     emitCurveChanged();
@@ -344,14 +346,24 @@ void CurveItem::setInterpolation(Keyframe::Interpolation interpolation)
     emit curveChanged(id(), curve());
 }
 
+void CurveItem::toggleUnified()
+{
+    if (m_keyframes.empty())
+        return;
+
+    for (auto *frame : m_keyframes) {
+        if (frame->selected())
+            frame->toggleUnified();
+    }
+    emit curveChanged(id(), curve());
+}
+
 void CurveItem::connect(GraphicsScene *scene)
 {
     QObject::connect(this, &CurveItem::curveChanged, scene, &GraphicsScene::curveChanged);
 
-    for (auto *frame : m_keyframes) {
-        QObject::connect(frame, &KeyframeItem::keyframeMoved, scene, &GraphicsScene::keyframeMoved);
-        QObject::connect(frame, &KeyframeItem::handleMoved, scene, &GraphicsScene::handleMoved);
-    }
+    QObject::connect(this, &CurveItem::keyframeMoved, scene, &GraphicsScene::keyframeMoved);
+    QObject::connect(this, &CurveItem::handleMoved, scene, &GraphicsScene::handleMoved);
 }
 
 void CurveItem::insertKeyframeByTime(double time)
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.h b/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.h
index e1517cf6dba..a8b18fa698f 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.h
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/curveitem.h
@@ -27,6 +27,7 @@
 
 #include "curveeditorstyle.h"
 #include "curvesegment.h"
+#include "handleitem.h"
 #include "keyframe.h"
 #include "selectableitem.h"
 #include "treeitem.h"
@@ -47,6 +48,10 @@ class CurveItem : public CurveEditorItem
 signals:
     void curveChanged(unsigned int id, const AnimationCurve &curve);
 
+    void keyframeMoved(KeyframeItem *item, const QPointF &direction);
+
+    void handleMoved(KeyframeItem *frame, HandleItem::Slot slot, double angle, double deltaLength);
+
 public:
     CurveItem(QGraphicsItem *parent = nullptr);
 
@@ -100,6 +105,8 @@ public:
 
     void setInterpolation(Keyframe::Interpolation interpolation);
 
+    void toggleUnified();
+
     void connect(GraphicsScene *scene);
 
     void insertKeyframeByTime(double time);
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.cpp b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.cpp
index ee907ec8cdb..3b7d848eaab 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.cpp
@@ -37,6 +37,7 @@ GraphicsScene::GraphicsScene(QObject *parent)
     : QGraphicsScene(parent)
     , m_dirty(true)
     , m_limits()
+    , m_doNotMoveItems(false)
 {}
 
 bool GraphicsScene::empty() const
@@ -64,6 +65,11 @@ double GraphicsScene::maximumValue() const
     return limits().top();
 }
 
+void GraphicsScene::doNotMoveItems(bool val)
+{
+    m_doNotMoveItems = val;
+}
+
 void GraphicsScene::addCurveItem(CurveItem *item)
 {
     m_dirty = true;
@@ -111,10 +117,9 @@ void GraphicsScene::handleUnderMouse(HandleItem *handle)
         if (item == handle)
             continue;
 
-        if (auto *handleItem = qgraphicsitem_cast<HandleItem *>(item)) {
-            if (handleItem->selected()) {
-                if (handleItem->slot() == handle->slot())
-                    handleItem->setActivated(handle->isUnderMouse());
+        if (auto *keyItem = qgraphicsitem_cast<KeyframeItem *>(item)) {
+            if (keyItem->selected()) {
+                keyItem->setActivated(handle->isUnderMouse(), handle->slot());
             }
         }
     }
@@ -125,14 +130,29 @@ void GraphicsScene::handleMoved(KeyframeItem *frame,
                                 double angle,
                                 double deltaLength)
 {
+    if (m_doNotMoveItems)
+        return;
+
+    auto moveUnified = [handle, angle, deltaLength](KeyframeItem *key) {
+        if (key->isUnified()) {
+            if (handle == HandleItem::Slot::Left)
+                key->moveHandle(HandleItem::Slot::Right, angle, deltaLength);
+            else
+                key->moveHandle(HandleItem::Slot::Left, angle, deltaLength);
+        }
+    };
+
     const auto itemList = items();
     for (auto *item : itemList) {
-        if (item == frame)
-            continue;
-
         if (auto *frameItem = qgraphicsitem_cast<KeyframeItem *>(item)) {
-            if (frameItem->selected())
+            if (item == frame) {
+                moveUnified(frameItem);
+                continue;
+            }
+            if (frameItem->selected()) {
                 frameItem->moveHandle(handle, angle, deltaLength);
+                moveUnified(frameItem);
+            }
         }
     }
 }
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.h b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.h
index 77aa8c168d3..44936a76bde 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.h
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsscene.h
@@ -61,6 +61,8 @@ public:
 
     double maximumValue() const;
 
+    void doNotMoveItems(bool tmp);
+
     void addCurveItem(CurveItem *item);
 
     void setComponentTransform(const QTransform &transform);
@@ -90,6 +92,8 @@ private:
     mutable bool m_dirty;
 
     mutable QRectF m_limits;
+
+    bool m_doNotMoveItems;
 };
 
 } // End namespace DesignTools.
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.cpp b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.cpp
index f7494b9dc80..217fdf10e99 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.cpp
@@ -275,6 +275,18 @@ void GraphicsView::setInterpolation(Keyframe::Interpolation interpol)
     viewport()->update();
 }
 
+void GraphicsView::toggleUnified()
+{
+    const auto itemList = items();
+    for (auto *item : itemList) {
+        if (auto *citem = qgraphicsitem_cast<CurveItem *>(item)) {
+            if (citem->hasSelection())
+                citem->toggleUnified();
+        }
+    }
+    viewport()->update();
+}
+
 void GraphicsView::resizeEvent(QResizeEvent *event)
 {
     QGraphicsView::resizeEvent(event);
@@ -433,6 +445,8 @@ QPointF GraphicsView::globalToRaster(const QPoint &point) const
 
 void GraphicsView::applyZoom(double x, double y, const QPoint &pivot)
 {
+    m_scene.doNotMoveItems(true);
+
     QPointF pivotRaster(globalToRaster(pivot));
 
     m_zoomX = clamp(x, 0.0, 1.0);
@@ -471,6 +485,8 @@ void GraphicsView::applyZoom(double x, double y, const QPoint &pivot)
         QPointF deltaTransformed = pivotRaster - globalToRaster(pivot);
         scrollContent(mapTimeToX(deltaTransformed.x()), mapValueToY(deltaTransformed.y()));
     }
+
+    m_scene.doNotMoveItems(false);
 }
 
 void GraphicsView::insertKeyframe(double time, bool allVisibleCurves)
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.h b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.h
index 7308d77608d..7100bbd29b0 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.h
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/graphicsview.h
@@ -112,6 +112,8 @@ public:
 
     void setInterpolation(Keyframe::Interpolation interpol);
 
+    void toggleUnified();
+
 protected:
     void resizeEvent(QResizeEvent *event) override;
 
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/handleitem.cpp b/src/plugins/qmldesigner/components/curveeditor/detail/handleitem.cpp
index 33f35e52ac3..c0026c67f20 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/handleitem.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/handleitem.cpp
@@ -130,7 +130,7 @@ void HandleItem::setStyle(const CurveEditorStyle &style)
 QVariant HandleItem::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value)
 {
     if (change == ItemPositionChange) {
-        if (KeyframeItem *parent = qgraphicsitem_cast<KeyframeItem *>(parentItem())) {
+        if (qgraphicsitem_cast<KeyframeItem *>(parentItem())) {
             QPointF pos = value.toPointF();
             if (m_slot == HandleItem::Slot::Left) {
                 if (pos.x() > 0.0)
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.cpp b/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.cpp
index b9adeb01ccb..bc8bd2f0e67 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.cpp
@@ -64,14 +64,22 @@ void KeyframeItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *opti
     Q_UNUSED(option)
     Q_UNUSED(widget)
 
+    QColor mainColor = selected() ? m_style.selectionColor : m_style.color;
+    QColor borderColor = isUnified() ? m_style.unifiedColor : m_style.splitColor;
+
+    if (locked()) {
+        mainColor = m_style.lockedColor;
+        borderColor = m_style.lockedColor;
+    }
+
     QPen pen = painter->pen();
-    pen.setColor(Qt::black);
+    pen.setWidthF(1.);
+    pen.setColor(borderColor);
 
     painter->save();
     painter->setPen(pen);
-    painter->setBrush(locked() ? Qt::black : (selected() ? Qt::red : m_style.color));
+    painter->setBrush(mainColor);
     painter->drawEllipse(boundingRect());
-
     painter->restore();
 }
 
@@ -93,6 +101,11 @@ Keyframe KeyframeItem::keyframe() const
     return m_frame;
 }
 
+bool KeyframeItem::isUnified() const
+{
+    return m_frame.isUnified();
+}
+
 bool KeyframeItem::hasLeftHandle() const
 {
     return m_frame.hasLeftHandle();
@@ -108,11 +121,6 @@ QTransform KeyframeItem::transform() const
     return m_transform;
 }
 
-bool KeyframeItem::contains(HandleItem *handle, const QPointF &point) const
-{
-    return false;
-}
-
 void KeyframeItem::setHandleVisibility(bool visible)
 {
     m_visibleOverride = visible;
@@ -195,6 +203,31 @@ void KeyframeItem::setKeyframe(const Keyframe &keyframe)
     setPos(m_transform.map(m_frame.position()));
 }
 
+void KeyframeItem::toggleUnified()
+{
+    if (!m_left || !m_right)
+        return;
+
+    if (m_frame.isUnified())
+        m_frame.setUnified(false);
+    else
+        m_frame.setUnified(true);
+}
+
+void KeyframeItem::setActivated(bool active, HandleItem::Slot slot)
+{
+    if (isUnified() && m_left && m_right) {
+        m_left->setActivated(active);
+        m_right->setActivated(active);
+        return;
+    }
+
+    if (slot == HandleItem::Slot::Left && m_left)
+        m_left->setActivated(active);
+    else if (slot == HandleItem::Slot::Right && m_right)
+        m_right->setActivated(active);
+}
+
 void KeyframeItem::setInterpolation(Keyframe::Interpolation interpolation)
 {
     m_frame.setInterpolation(interpolation);
diff --git a/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.h b/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.h
index 8518fbee691..b6807a1232d 100644
--- a/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.h
+++ b/src/plugins/qmldesigner/components/curveeditor/detail/keyframeitem.h
@@ -66,14 +66,14 @@ public:
 
     Keyframe keyframe() const;
 
+    bool isUnified() const;
+
     bool hasLeftHandle() const;
 
     bool hasRightHandle() const;
 
     QTransform transform() const;
 
-    bool contains(HandleItem *handle, const QPointF &point) const;
-
     void setHandleVisibility(bool visible);
 
     void setComponentTransform(const QTransform &transform);
@@ -82,6 +82,10 @@ public:
 
     void setKeyframe(const Keyframe &keyframe);
 
+    void toggleUnified();
+
+    void setActivated(bool active, HandleItem::Slot slot);
+
     void setInterpolation(Keyframe::Interpolation interpolation);
 
     void setLeftHandle(const QPointF &pos);
diff --git a/src/plugins/qmldesigner/components/curveeditor/keyframe.cpp b/src/plugins/qmldesigner/components/curveeditor/keyframe.cpp
index 0ac23c36153..d0a411e849c 100644
--- a/src/plugins/qmldesigner/components/curveeditor/keyframe.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/keyframe.cpp
@@ -31,6 +31,7 @@ namespace DesignTools {
 
 Keyframe::Keyframe()
     : m_interpolation(Interpolation::Undefined)
+    , m_unified(false)
     , m_position()
     , m_leftHandle()
     , m_rightHandle()
@@ -39,6 +40,7 @@ Keyframe::Keyframe()
 
 Keyframe::Keyframe(const QPointF &position)
     : m_interpolation(Interpolation::Linear)
+    , m_unified(false)
     , m_position(position)
     , m_leftHandle()
     , m_rightHandle()
@@ -47,6 +49,7 @@ Keyframe::Keyframe(const QPointF &position)
 
 Keyframe::Keyframe(const QPointF &position, const QVariant &data)
     : m_interpolation(Interpolation::Undefined)
+    , m_unified(false)
     , m_position(position)
     , m_leftHandle()
     , m_rightHandle()
@@ -57,6 +60,7 @@ Keyframe::Keyframe(const QPointF &position, const QVariant &data)
 
 Keyframe::Keyframe(const QPointF &position, const QPointF &leftHandle, const QPointF &rightHandle)
     : m_interpolation(Interpolation::Bezier)
+    , m_unified(false)
     , m_position(position)
     , m_leftHandle(leftHandle)
     , m_rightHandle(rightHandle)
@@ -73,6 +77,11 @@ bool Keyframe::hasData() const
     return m_data.isValid();
 }
 
+bool Keyframe::isUnified() const
+{
+    return m_unified;
+}
+
 bool Keyframe::hasLeftHandle() const
 {
     return !m_leftHandle.isNull();
@@ -143,6 +152,11 @@ void Keyframe::setPosition(const QPointF &pos)
     m_position = pos;
 }
 
+void Keyframe::setUnified(bool unified)
+{
+    m_unified = unified;
+}
+
 void Keyframe::setLeftHandle(const QPointF &pos)
 {
     m_leftHandle = pos;
diff --git a/src/plugins/qmldesigner/components/curveeditor/keyframe.h b/src/plugins/qmldesigner/components/curveeditor/keyframe.h
index 76284b2ff96..3aef8ed085a 100644
--- a/src/plugins/qmldesigner/components/curveeditor/keyframe.h
+++ b/src/plugins/qmldesigner/components/curveeditor/keyframe.h
@@ -47,6 +47,8 @@ public:
 
     bool hasData() const;
 
+    bool isUnified() const;
+
     bool hasLeftHandle() const;
 
     bool hasRightHandle() const;
@@ -63,6 +65,8 @@ public:
 
     Interpolation interpolation() const;
 
+    void setUnified(bool unified);
+
     void setPosition(const QPointF &pos);
 
     void setLeftHandle(const QPointF &pos);
@@ -76,6 +80,8 @@ public:
 private:
     Interpolation m_interpolation = Interpolation::Undefined;
 
+    bool m_unified;
+
     QPointF m_position;
 
     QPointF m_leftHandle;
diff --git a/src/plugins/qmldesigner/components/curveeditor/treeitem.cpp b/src/plugins/qmldesigner/components/curveeditor/treeitem.cpp
index 86fdf1d674d..cd8b113c4b3 100644
--- a/src/plugins/qmldesigner/components/curveeditor/treeitem.cpp
+++ b/src/plugins/qmldesigner/components/curveeditor/treeitem.cpp
@@ -311,6 +311,16 @@ AnimationCurve PropertyTreeItem::curve() const
     return m_curve;
 }
 
+bool PropertyTreeItem::hasUnified() const
+{
+    return m_curve.hasUnified();
+}
+
+QString PropertyTreeItem::unifyString() const
+{
+    return m_curve.unifyString();
+}
+
 void PropertyTreeItem::setCurve(const AnimationCurve &curve)
 {
     m_curve = curve;
diff --git a/src/plugins/qmldesigner/components/curveeditor/treeitem.h b/src/plugins/qmldesigner/components/curveeditor/treeitem.h
index 0c1d16541cf..64448af9e5a 100644
--- a/src/plugins/qmldesigner/components/curveeditor/treeitem.h
+++ b/src/plugins/qmldesigner/components/curveeditor/treeitem.h
@@ -155,6 +155,10 @@ public:
 
     AnimationCurve curve() const;
 
+    bool hasUnified() const;
+
+    QString unifyString() const;
+
     void setCurve(const AnimationCurve &curve);
 
     void setComponent(const Component &comp);
diff --git a/src/plugins/qmldesigner/components/timelineeditor/animationcurveeditormodel.cpp b/src/plugins/qmldesigner/components/timelineeditor/animationcurveeditormodel.cpp
index 023200f494d..077b467c0e2 100644
--- a/src/plugins/qmldesigner/components/timelineeditor/animationcurveeditormodel.cpp
+++ b/src/plugins/qmldesigner/components/timelineeditor/animationcurveeditormodel.cpp
@@ -230,6 +230,19 @@ DesignTools::AnimationCurve AnimationCurveEditorModel::createDoubleCurve(
 {
     std::vector<DesignTools::Keyframe> keyframes = createKeyframes(group.keyframePositions());
     keyframes = resolveSmallCurves(keyframes);
+
+    QString str;
+    ModelNode target = group.modelNode();
+    if (target.hasAuxiliaryData("unified"))
+        str = target.auxiliaryData("unified").toString();
+
+    if (str.size() == static_cast<int>(keyframes.size())) {
+        for (int i = 0; i < str.size(); ++i) {
+            if (str.at(i) == '1')
+                keyframes[i].setUnified(true);
+        }
+    }
+
     return DesignTools::AnimationCurve(keyframes);
 }
 
diff --git a/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.cpp b/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.cpp
index 5d693f54225..dec61de19fb 100644
--- a/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.cpp
+++ b/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.cpp
@@ -253,11 +253,6 @@ void TimelineToolBar::openAnimationCurveEditor()
     m_dialog->show();
 }
 
-void TimelineToolBar::updateCurve(DesignTools::PropertyTreeItem *item)
-{
-    DesignTools::AnimationCurve curve = item->curve();
-}
-
 void TimelineToolBar::createLeftControls()
 {
     auto addActionToGroup = [&](QAction *action) {
diff --git a/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.h b/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.h
index 6f275484b4a..1bb222b424b 100644
--- a/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.h
+++ b/src/plugins/qmldesigner/components/timelineeditor/timelinetoolbar.h
@@ -91,8 +91,6 @@ public:
 
     void openAnimationCurveEditor();
 
-    void updateCurve(DesignTools::PropertyTreeItem *item);
-
 protected:
     void resizeEvent(QResizeEvent *event) override;
 
diff --git a/src/plugins/qmldesigner/components/timelineeditor/timelinewidget.cpp b/src/plugins/qmldesigner/components/timelineeditor/timelinewidget.cpp
index 508db1051b6..85a68cd0bd0 100644
--- a/src/plugins/qmldesigner/components/timelineeditor/timelinewidget.cpp
+++ b/src/plugins/qmldesigner/components/timelineeditor/timelinewidget.cpp
@@ -340,6 +340,11 @@ void TimelineWidget::updateAnimationCurve(DesignTools::PropertyTreeItem *item)
                 groupNode.setAuxiliaryData("pinned", true);
             else
                 groupNode.removeAuxiliaryData("pinned");
+
+            if (item->hasUnified())
+                groupNode.setAuxiliaryData("unified", item->unifyString());
+            else
+                groupNode.removeAuxiliaryData("unified");
         }
 
         auto replaceKeyframes = [&group, item, this]() {