[TD]implement navigation styles

src/Mod/TechDraw/Gui/QGVNavStyleTouchpad.cpp

@@ -0,0 +1,130 @@
+/***************************************************************************
+ *   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 "QGVNavStyleTouchpad.h"
+
+using namespace TechDrawGui;
+
+namespace TechDrawGui {
+
+QGVNavStyleTouchpad::QGVNavStyleTouchpad()
+{
+}
+
+QGVNavStyleTouchpad::~QGVNavStyleTouchpad()
+{
+}
+
+void QGVNavStyleTouchpad::handleKeyPressEvent(QKeyEvent *event)
+{
+//    Q_UNUSED(event)
+    if (event->key() == Qt::Key_PageUp) {
+        setAnchor();
+        zoom(1.0 + zoomStep);
+        event->accept();
+        return;
+    }
+
+    if (event->key() == Qt::Key_PageDown) {
+        setAnchor();
+        zoom(1.0 - zoomStep);
+        event->accept();
+        return;
+    }
+}
+
+void QGVNavStyleTouchpad::handleKeyReleaseEvent(QKeyEvent *event)
+{
+//    Q_UNUSED(event)
+    if (event->key() == Qt::Key_Shift) {
+        if (panningActive == true) {
+            stopPan();
+        }
+        zoomingActive = false;
+    }
+
+    if (event->key() == Qt::Key_Control) {
+        zoomingActive = false;
+    }
+
+}
+
+void QGVNavStyleTouchpad::handleMouseMoveEvent(QMouseEvent *event)
+{
+    if (getViewer()->isBalloonPlacing()) {
+        getViewer()->setBalloonCursorPos(event->pos());
+    }
+
+    if (QApplication::keyboardModifiers() == Qt::ShiftModifier) {
+        //if shift is down then we are panning
+        if (!panningActive) {
+            startPan(event->pos());
+        }
+        zoomingActive = false;
+    } else if (QApplication::keyboardModifiers() == (Qt::ControlModifier | Qt::ShiftModifier)) {
+        // if control and shift are down then we are zooming
+        if (panningActive == true) {
+            stopPan();
+        }
+        if (!zoomingActive) {
+            startZoom(event->pos());
+            event->accept();
+            return;     //don't zoom on first movement
+        }
+    } else {
+        if (panningActive == true) {
+            stopPan();
+        }
+        zoomingActive = false;
+    }
+
+    if (panningActive) {
+        pan(event->pos());
+        event->accept();
+    }
+
+    if (zoomingActive) {
+//        setAnchor();
+        zoom(mouseZoomFactor(event->pos()));
+        event->accept();
+    }
+}
+
+void QGVNavStyleTouchpad::setAnchor()
+{
+    //this navigation style can not anchor under mouse since mouse is moving as part of zoom action
+    if (m_viewer != nullptr) {
+        m_viewer->setResizeAnchor(QGraphicsView::AnchorViewCenter);
+        m_viewer->setTransformationAnchor(QGraphicsView::AnchorViewCenter);
+    }
+}
+
+
+}  //namespace TechDrawGui