[TD]implement navigation styles

src/Mod/TechDraw/Gui/QGVNavStyleMaya.cpp

@@ -0,0 +1,123 @@
+/***************************************************************************
+ *   Copyright (c) 2022 Wanderer Fan <wandererfan@gmail.com>               *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#include <QApplication>
+#include <QGuiApplication>
+#include <QMouseEvent>
+#endif
+
+#include "QGVPage.h"
+#include "QGVNavStyleMaya.h"
+
+using namespace TechDrawGui;
+
+namespace TechDrawGui {
+
+//******
+// Issue: on linux mint, ALT + mouse button doesn't get to the application.
+//        system eats the event for menus, accessibility magnifier, etc.
+//        only wheel zoom is known to work.
+//        need to test in different environment.
+//******
+
+QGVNavStyleMaya::QGVNavStyleMaya()
+{
+}
+
+QGVNavStyleMaya::~QGVNavStyleMaya()
+{
+}
+
+void QGVNavStyleMaya::handleKeyReleaseEvent(QKeyEvent *event)
+{
+    //zoom mode 2
+    if ( (event->key() == Qt::Key_Alt) && zoomingActive) {
+        zoomingActive = false;
+        event->accept();
+    }
+
+    //pan mode
+    if ((event->key() == Qt::Key_Alt) && panningActive) {
+        stopPan();
+        event->accept();
+    }
+}
+void QGVNavStyleMaya::handleMousePressEvent(QMouseEvent *event)
+{
+    //pan mode alt + MMB + mouse movement
+    if ((event->button() == Qt::MiddleButton) && 
+        (QApplication::keyboardModifiers() == Qt::AltModifier)) {
+        startPan(event->pos());
+        event->accept();
+    }
+
+    //zoom mode 2 ALT + RMB
+    if ((event->button() == Qt::RightButton) &&
+        (QApplication::keyboardModifiers() == Qt::AltModifier)) {
+        startZoom(event->pos());
+        event->accept();
+    }
+}
+
+void QGVNavStyleMaya::handleMouseMoveEvent(QMouseEvent *event)
+{
+    if (getViewer()->isBalloonPlacing()) {
+        getViewer()->setBalloonCursorPos(event->pos());
+    }
+
+    if (panningActive) {
+        pan(event->pos());
+        event->accept();
+    }
+
+    if (zoomingActive) {
+        zoom(mouseZoomFactor(event->pos()));
+        event->accept();
+    }
+}
+
+void QGVNavStyleMaya::handleMouseReleaseEvent(QMouseEvent *event)
+{
+    if (getViewer()->isBalloonPlacing()) {
+        placeBalloon(event->pos());
+    }
+
+    if (event->button() == Qt::MiddleButton) {
+        //pan mode ALT + MMB
+        if (panningActive) {
+            stopPan();
+            event->accept();
+        }
+    }
+
+    if (event->button() == Qt::RightButton) {
+        //zoom mode 2 ALT + RMB
+        if (zoomingActive) {
+            zoomingActive = false;
+            event->accept();
+        }
+    }
+}
+
+}  // namespace TechDrawGui