Keep track of keys pressed, synthesize release events when focus is lost.

Closes #2375.

interface/interface_en.ts

@@ -4,22 +4,22 @@
 <context>
     <name>Application</name>
     <message>
-        <location filename="src/Application.cpp" line="1354"/>
+        <location filename="src/Application.cpp" line="1364"/>
         <source>Export Voxels</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Application.cpp" line="1355"/>
+        <location filename="src/Application.cpp" line="1365"/>
         <source>Sparse Voxel Octree Files (*.svo)</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Application.cpp" line="3565"/>
+        <location filename="src/Application.cpp" line="3575"/>
         <source>Open Script</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Application.cpp" line="3566"/>
+        <location filename="src/Application.cpp" line="3576"/>
         <source>JavaScript Files (*.js)</source>
         <translation type="unfinished"></translation>
     </message>

interface/src/Application.cpp

@@ -692,6 +692,8 @@ bool Application::event(QEvent* event) {
 
 void Application::keyPressEvent(QKeyEvent* event) {
 
+    _keysPressed.insert(event->key());
+
     _controllerScriptingInterface.emitKeyPressEvent(event); // send events to any registered scripts
     
     // if one of our scripts have asked to capture this event, then stop processing it
@@ -914,6 +916,8 @@ void Application::keyPressEvent(QKeyEvent* event) {
 
 void Application::keyReleaseEvent(QKeyEvent* event) {
 
+    _keysPressed.remove(event->key());
+
     _controllerScriptingInterface.emitKeyReleaseEvent(event); // send events to any registered scripts
 
     // if one of our scripts have asked to capture this event, then stop processing it
@@ -921,8 +925,6 @@ void Application::keyReleaseEvent(QKeyEvent* event) {
         return;
     }
 
-
-    if (activeWindow() == _window) {
     switch (event->key()) {
         case Qt::Key_E:
             _myAvatar->setDriveKeys(UP, 0.f);
@@ -972,7 +974,15 @@ void Application::keyReleaseEvent(QKeyEvent* event) {
             event->ignore();
             break;
     }
+}
+
+void Application::focusOutEvent(QFocusEvent* event) {
+    // synthesize events for keys currently pressed, since we may not get their release events
+    foreach (int key, _keysPressed) {
+        QKeyEvent event(QEvent::KeyRelease, key, Qt::NoModifier);
+        keyReleaseEvent(&event);
     }
+    _keysPressed.clear();
 }
 
 void Application::mouseMoveEvent(QMouseEvent* event) {

interface/src/Application.h

@@ -18,6 +18,7 @@
 #include <QSettings>
 #include <QTouchEvent>
 #include <QList>
+#include <QSet>
 #include <QStringList>
 #include <QPointer>
 
@@ -122,6 +123,8 @@ public:
     void keyPressEvent(QKeyEvent* event);
     void keyReleaseEvent(QKeyEvent* event);
 
+    void focusOutEvent(QFocusEvent* event);
+
     void mouseMoveEvent(QMouseEvent* event);
     void mousePressEvent(QMouseEvent* event);
     void mouseReleaseEvent(QMouseEvent* event);
@@ -432,6 +435,8 @@ private:
 
     bool _mousePressed; //  true if mouse has been pressed (clear when finished)
 
+    QSet<int> _keysPressed;
+
     GeometryCache _geometryCache;
     TextureCache _textureCache;
 

interface/src/GLCanvas.cpp

@@ -55,6 +55,10 @@ void GLCanvas::keyReleaseEvent(QKeyEvent* event) {
     Application::getInstance()->keyReleaseEvent(event);
 }
 
+void GLCanvas::focusOutEvent(QFocusEvent* event) {
+    Application::getInstance()->focusOutEvent(event);
+}
+
 void GLCanvas::mouseMoveEvent(QMouseEvent* event) {
     Application::getInstance()->mouseMoveEvent(event);
 }

interface/src/GLCanvas.h

@@ -31,6 +31,8 @@ protected:
     virtual void keyPressEvent(QKeyEvent* event);
     virtual void keyReleaseEvent(QKeyEvent* event);
     
+    virtual void focusOutEvent(QFocusEvent* event);
+    
     virtual void mouseMoveEvent(QMouseEvent* event);
     virtual void mousePressEvent(QMouseEvent* event);
     virtual void mouseReleaseEvent(QMouseEvent* event);