QmlDesigner: Add fit root to screen button

* Add fit root to screen action to designer actions
* Add button to form editor taskbar to trigger the action
* Add additional zoom levels

Task-number: QDS-2234
Change-Id: I1310da8ee9cfa608ed0c28f8bff769d320f588c3
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/componentcore/componentcore_constants.h

@@ -83,6 +83,7 @@ const char decreaseIndexOfStackedContainerCommandId[] = "DecreaseIndexOfStackedC
 const char flowAssignEffectCommandId[] = "AssignFlowEffect";
 const char flowAssignCustomEffectCommandId[] = "AssignFlowCustomEffect";
 const char addToGroupItemCommandId[] = "AddToGroupItem";
+const char fitRootToScreenCommandId[] = "FitRootToScreen";
 
 const char selectionCategoryDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Selection");
 const char flowConnectionCategoryDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Connect");
@@ -155,6 +156,8 @@ const char layoutFillHeightDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContext
 const char flowAssignEffectDisplayName[] = "Assign FlowEffect ";
 const char flowAssignCustomEffectDisplayName[] = "Assign Custom FlowEffect ";
 
+const char fitRootToScreenDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Fit root to screen");
+
 const char raiseToolTip[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Raise selected item.");
 const char lowerToolTip[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Lower selected item.");
 
@@ -173,6 +176,8 @@ const char decreaseIndexOfStackedContainerToolTip[] = QT_TRANSLATE_NOOP("QmlDesi
 const char addItemToStackedContainerToolTip[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Add item to stacked container.");
 const char addFlowActionToolTip[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Add flow action.");
 
+const char fitRootToScreenToolTip[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Fit the root element inside the available space.");
+
 const int priorityFirst = 280;
 const int prioritySelectionCategory = 220;
 const int priorityQmlPreviewCategory = 200;

src/plugins/qmldesigner/components/componentcore/designeractionmanager.cpp

@@ -821,6 +821,16 @@ void DesignerActionManager::createDefaultDesignerActions()
                           &resetSize,
                           &selectionNotEmptyAndHasWidthOrHeightProperty));
 
+    addDesignerAction(new ModelNodeAction(
+                          fitRootToScreenCommandId,
+                          fitRootToScreenDisplayName,
+                          Utils::Icon({{":/utils/images/fittoview.png", Utils::Theme::IconsBaseColor}}).icon(),
+                          fitRootToScreenToolTip,
+                          genericToolBarCategory,
+                          QKeySequence(Qt::CTRL + Qt::ALT + Qt::Key_0),
+                          182,
+                          &fitRootToScreen));
+
     addDesignerAction(new SeperatorDesignerAction(editCategory, 170));
 
     addDesignerAction(new VisiblityModelNodeAction(

src/plugins/qmldesigner/components/componentcore/modelnodeoperations.cpp

@@ -344,6 +344,14 @@ void resetPosition(const SelectionContext &selectionState)
     });
 }
 
+void fitRootToScreen(const SelectionContext &selectionState)
+{
+    if (!selectionState.view())
+        return;
+
+    selectionState.view()->emitCustomNotification(QStringLiteral("fit root to screen"));
+}
+
 void goIntoComponentOperation(const SelectionContext &selectionState)
 {
     goIntoComponent(selectionState.currentSingleSelectedNode());

src/plugins/qmldesigner/components/componentcore/modelnodeoperations.h

@@ -49,6 +49,7 @@ void setFillWidth(const SelectionContext &selectionState);
 void setFillHeight(const SelectionContext &selectionState);
 void resetSize(const SelectionContext &selectionState);
 void resetPosition(const SelectionContext &selectionState);
+void fitRootToScreen(const SelectionContext &selectionState);
 void goIntoComponentOperation(const SelectionContext &selectionState);
 void setId(const SelectionContext &selectionState);
 void resetZ(const SelectionContext &selectionState);

src/plugins/qmldesigner/components/componentcore/zoomaction.cpp

@@ -30,7 +30,7 @@
 
 namespace QmlDesigner {
 
-const int defaultZoomIndex = 11;
+const int defaultZoomIndex = 13;
 
 ZoomAction::ZoomAction(QObject *parent)
     :  QWidgetAction(parent),
@@ -69,14 +69,19 @@ void ZoomAction::setZoomLevel(float zoomLevel)
     if (qFuzzyCompare(m_zoomLevel, zoomLevel))
         return;
 
+    forceZoomLevel(zoomLevel);
+}
+
+void ZoomAction::forceZoomLevel(float zoomLevel)
+{
     m_zoomLevel = qBound(0.01f, zoomLevel, 16.0f);
     emit zoomLevelChanged(m_zoomLevel);
 }
 
 //initial m_zoomLevel and m_currentComboBoxIndex
-const QVector<float> s_zoomFactors = {0.01f, 0.02f, 0.05f, 0.0625f, 0.125f, 0.25f,
-                                      0.33f, 0.5f, 0.66f, 0.75f, 0.9f, 1.0f, 1.25f,
-                                      1.5f, 1.75f, 2.0f, 3.0f, 4.0f, 6.0f, 8.0f, 10.0f, 16.0f };
+const QVector<float> s_zoomFactors = {0.01f, 0.02f, 0.05f, 0.0625f, 0.1f, 0.125f, 0.2f, 0.25f,
+                                      0.33f, 0.5f, 0.66f, 0.75f, 0.9f, 1.0f, 1.1f, 1.25f, 1.33f,
+                                      1.5f, 1.66f, 1.75f, 2.0f, 3.0f, 4.0f, 6.0f, 8.0f, 10.0f, 16.0f };
 
 int getZoomIndex(float zoom)
 {
@@ -87,6 +92,15 @@ int getZoomIndex(float zoom)
     return -1;
 }
 
+float ZoomAction::getClosestZoomLevel(float zoomLevel)
+{
+    int i = 0;
+    while (i < s_zoomFactors.size() && s_zoomFactors[i] < zoomLevel)
+        ++i;
+
+    return s_zoomFactors[qBound(0, i - 1, s_zoomFactors.size() - 1)];
+}
+
 QWidget *ZoomAction::createWidget(QWidget *parent)
 {
     auto comboBox = new QComboBox(parent);

src/plugins/qmldesigner/components/componentcore/zoomaction.h

@@ -48,6 +48,9 @@ public:
     void zoomOut();
     void resetZoomLevel();
     void setZoomLevel(float zoomLevel);
+    void forceZoomLevel(float zoomLevel);
+
+    static float getClosestZoomLevel(float zoomLevel);
 
 protected:
     QWidget *createWidget(QWidget *parent) override;

src/plugins/qmldesigner/components/formeditor/formeditorview.cpp

@@ -448,6 +448,28 @@ void FormEditorView::customNotification(const AbstractView * /*view*/, const QSt
         m_dragTool->clearMoveDelay();
     if (identifier == QLatin1String("reset QmlPuppet"))
         temporaryBlockView();
+    if (identifier == QLatin1String("fit root to screen")) {
+
+        if (QmlItemNode(rootModelNode()).isFlowView()) {
+            QRectF boundingRect;
+            for (QGraphicsItem *item : scene()->items()) {
+                if (auto formEditorItem = FormEditorItem::fromQGraphicsItem(item)) {
+                    if (!formEditorItem->qmlItemNode().modelNode().isRootNode()
+                        && !formEditorItem->sceneBoundingRect().isNull())
+                        boundingRect = boundingRect.united(formEditorItem->sceneBoundingRect());
+                }
+            }
+            m_formEditorWidget->graphicsView()->fitInView(boundingRect,
+                                                          Qt::KeepAspectRatio);
+        } else {
+            m_formEditorWidget->graphicsView()->fitInView(m_formEditorWidget->rootItemRect(),
+                                                          Qt::KeepAspectRatio);
+        }
+
+        const qreal scaleFactor = m_formEditorWidget->graphicsView()->viewportTransform().m11();
+        float zoomLevel = ZoomAction::getClosestZoomLevel(scaleFactor);
+        m_formEditorWidget->zoomAction()->forceZoomLevel(zoomLevel);
+    }
 }
 
 AbstractFormEditorTool *FormEditorView::currentTool() const