Finishing of dimension plugin

PdfForQtViewer/pdfviewermainwindow.cpp

@@ -375,7 +375,31 @@ void PDFViewerMainWindow::loadPlugins()
 
                 menu->addAction(action);
                 toolbarButton->menu()->addAction(action);
-                connect(action, &QAction::triggered, toolbarButton, [action, toolbarButton](){ toolbarButton->setDefaultAction(action); });
+
+                auto onPluginActionTriggered = [toolbarButton, action]()
+                {
+                    if (action->isEnabled())
+                    {
+                        toolbarButton->setDefaultAction(action);
+                    }
+                };
+                auto onPluginActionStateChanged = [toolbarButton, action]()
+                {
+                    if (!action->isEnabled() && toolbarButton->defaultAction() == action)
+                    {
+                        for (QAction* action : toolbarButton->menu()->actions())
+                        {
+                            if (action->isEnabled())
+                            {
+                                toolbarButton->setDefaultAction(action);
+                                break;
+                            }
+                        }
+                    }
+                };
+
+                connect(action, &QAction::triggered, toolbarButton, onPluginActionTriggered);
+                connect(action, &QAction::changed, toolbarButton, onPluginActionStateChanged);
             }
         }
     }

PdfForQtViewerPlugins/DimensionsPlugin/dimensionsplugin.cpp

@@ -290,6 +290,13 @@ void DimensionsPlugin::drawPage(QPainter* painter,
                 painter->drawLine(line1);
                 painter->drawLine(line2);
 
+                qreal startAngle = line1.angle() * 16;
+                qreal angleLength = dimension.getMeasuredValue() * 16;
+
+                QRectF rect(-maxLength * 0.5, -maxLength * 0.5, maxLength, maxLength);
+                rect.translate(line1.p1());
+                painter->drawArc(rect, startAngle - angleLength, angleLength);
+
                 QPen penPoint(Qt::black);
                 penPoint.setCapStyle(Qt::RoundCap);
                 penPoint.setWidthF(pointSize);
@@ -299,6 +306,14 @@ void DimensionsPlugin::drawPage(QPainter* painter,
                 painter->drawPoint(line1.p2());
                 painter->drawPoint(line2.p2());
 
+                QMatrix textMatrix;
+                textMatrix.translate(line1.x1(), line1.y1());
+                textMatrix.rotate(-line1.angle() + dimension.getMeasuredValue() * 0.5);
+
+                QPointF textPoint = textMatrix.map(QPointF(maxLength * 0.25, 0.0));
+                QString text = QString("%1 %2").arg(locale.toString(dimension.getMeasuredValue() * m_angleUnit.scale, 'f', 2), m_angleUnit.symbol);
+                painter->drawText(textPoint, text);
+
                 break;
             }