add default quarter files

src/Gui/Quarter/InteractionMode.cpp

@@ -0,0 +1,130 @@
+#include "InteractionMode.h"
+#include <QtCore/QCoreApplication>
+#include <QtGui/QKeyEvent>
+#include <QtGui/QFocusEvent>
+#include <Quarter/QuarterWidget.h>
+
+/*
+  Adjust how QuarterWidget reacts to alt key events
+ */
+
+using namespace SIM::Coin3D::Quarter;
+
+InteractionMode::InteractionMode(QuarterWidget * quarterwidget)
+  : QObject(quarterwidget)
+{
+  this->quarterwidget = quarterwidget;
+  this->altkeydown = false;
+  this->prevcursor = QCursor();
+  this->prevnavstate =
+    this->quarterwidget->getSoEventManager()->getNavigationState();
+
+  this->isenabled = true;
+}
+
+InteractionMode::~InteractionMode()
+{
+
+}
+
+void
+InteractionMode::setEnabled(bool yes)
+{
+  this->isenabled = yes;
+}
+
+bool
+InteractionMode::enabled(void) const
+{
+  return this->isenabled;
+}
+
+void
+InteractionMode::setOn(bool on)
+{
+  if (!this->isenabled) {
+    return;
+  }
+
+  SoEventManager * eventmanager = this->quarterwidget->getSoEventManager();
+
+  if (on) {
+    this->altkeydown = true;
+    this->prevnavstate = eventmanager->getNavigationState();
+    this->prevcursor = this->quarterwidget->cursor();
+    this->quarterwidget->setCursor(this->quarterwidget->stateCursor("interact"));
+    eventmanager->setNavigationState(SoEventManager::NO_NAVIGATION);
+  } else {
+    this->altkeydown = false;
+    this->quarterwidget->setCursor(this->prevcursor);
+    eventmanager->setNavigationState(this->prevnavstate);
+  }
+}
+
+bool
+InteractionMode::on(void) const
+{
+  return this->altkeydown;
+}
+
+bool
+InteractionMode::eventFilter(QObject * obj, QEvent * event)
+{
+  if (!this->isenabled) {
+    return false;
+  }
+
+  assert(obj == this->quarterwidget);
+
+  switch (event->type()) {
+  case QEvent::KeyPress:
+    return this->keyPressEvent(dynamic_cast<QKeyEvent *>(event));
+  case QEvent::KeyRelease:
+    return this->keyReleaseEvent(dynamic_cast<QKeyEvent *>(event));
+  case QEvent::FocusOut:
+    return this->focusOutEvent(dynamic_cast<QFocusEvent *>(event));
+  default:
+    return QObject::eventFilter(obj, event);
+  }
+}
+
+/*
+  when alt is pressed, override navigation and allow scenegraph to
+  process events so draggers and manipulators works
+ */
+bool
+InteractionMode::keyPressEvent(QKeyEvent * event)
+{
+  if (!event ||
+      !(event->key() == Qt::Key_Alt) ||
+      !(event->modifiers() & Qt::AltModifier)) {
+    return false;
+  }
+
+  this->setOn(true);
+  return true;
+}
+
+bool
+InteractionMode::keyReleaseEvent(QKeyEvent * event)
+{
+  if (!event || !(event->key() == Qt::Key_Alt)) {
+    return false;
+  }
+
+  this->setOn(false);
+  return true;
+}
+
+/*
+  if we lose focus while alt is down, send an alt-release event
+ */
+bool
+InteractionMode::focusOutEvent(QFocusEvent * event)
+{
+  if (this->altkeydown) {
+    QKeyEvent keyevent(QEvent::KeyRelease, Qt::Key_Alt, Qt::NoModifier);
+    return QCoreApplication::sendEvent(this->quarterwidget, &keyevent);
+  }
+  return false;
+}