[TechDraw] Multiselection mode implementation

src/Mod/TechDraw/Gui/QGIPrimPath.cpp

@@ -32,6 +32,10 @@
 
 #include <App/Application.h>
 
+#include <Gui/Selection.h>
+
+#include <Mod/TechDraw/App/DrawView.h>
+
 #include "QGIPrimPath.h"
 #include "PreferencesGui.h"
 #include "QGIView.h"
@@ -55,6 +59,7 @@ QGIPrimPath::QGIPrimPath():
     setAcceptHoverEvents(true);
 
     isHighlighted = false;
+    multiselectActivated = false;
 
     m_colOverride = false;
     m_colNormal = getNormalColor();
@@ -259,6 +264,50 @@ Qt::PenCapStyle QGIPrimPath::prefCapStyle()
     return result;
 }
 
+void QGIPrimPath::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    Qt::KeyboardModifiers originalModifiers = event->modifiers();
+    if (event->button()&Qt::LeftButton) {
+        multiselectActivated = false;
+    }
+
+    if (event->button() == Qt::LeftButton
+        && multiselectEligible()
+        && PreferencesGui::multiSelection()) {
+
+        auto parent = dynamic_cast<QGIView *>(parentItem());
+        if (parent) {
+            std::vector<Gui::SelectionObject> selection = Gui::Selection().getSelectionEx();
+            if (selection.size() == 1
+                && selection.front().getObject() == parent->getViewObject()) {
+
+                multiselectActivated = true;
+                event->setModifiers(originalModifiers | Qt::ControlModifier);
+            }
+        }
+    }
+
+    QGraphicsPathItem::mousePressEvent(event);
+
+    event->setModifiers(originalModifiers);
+}
+
+void QGIPrimPath::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    Qt::KeyboardModifiers originalModifiers = event->modifiers();
+    if ((event->button()&Qt::LeftButton) && multiselectActivated) {
+        if (PreferencesGui::multiSelection()) {
+            event->setModifiers(originalModifiers | Qt::ControlModifier);
+        }
+
+        multiselectActivated = false;
+    }
+
+    QGraphicsPathItem::mouseReleaseEvent(event);
+
+    event->setModifiers(originalModifiers);
+}
+
 void QGIPrimPath::setFill(QColor c, Qt::BrushStyle s) {
     setFillColor(c);
     m_fillNormal = s;