frontend: handle tablet and touch events

fixes #654 and #548

src/frontend/qt_sdl/main.cpp

@@ -764,17 +764,70 @@ void ScreenHandler::screenOnMouseMove(QMouseEvent* event)
     int x = event->pos().x();
     int y = event->pos().y();
 
-    Frontend::GetTouchCoords(x, y);
+    if (Frontend::GetTouchCoords(x, y))
-
-    // clamp to screen range
-    if (x < 0) x = 0;
-    else if (x > 255) x = 255;
-    if (y < 0) y = 0;
-    else if (y > 191) y = 191;
-
         NDS::TouchScreen(x, y);
 }
 
+void ScreenHandler::screenHandleTablet(QTabletEvent* event)
+{
+    event->accept();
+
+    switch(event->type())
+    {
+    case QEvent::TabletPress:
+    case QEvent::TabletMove:
+        {
+            int x = event->x();
+            int y = event->y();
+
+            if (Frontend::GetTouchCoords(x, y))
+            {
+                touching = true;
+                NDS::TouchScreen(x, y);
+            }
+        }
+        break;
+    case QEvent::TabletRelease:
+        if (touching)
+        {
+            NDS::ReleaseScreen();
+            touching = false;
+        }
+        break;
+    }
+}
+
+void ScreenHandler::screenHandleTouch(QTouchEvent* event)
+{
+    event->accept();
+
+    switch(event->type())
+    {
+    case QEvent::TouchBegin:
+    case QEvent::TouchUpdate:
+        if (event->touchPoints().length() > 0)
+        {
+            QPointF lastPosition = event->touchPoints().first().lastPos();
+            int x = (int)lastPosition.x();
+            int y = (int)lastPosition.y();
+
+            if (Frontend::GetTouchCoords(x, y))
+            {
+                touching = true;
+                NDS::TouchScreen(x, y);
+            }
+        }
+        break;
+    case QEvent::TouchEnd:
+        if (touching)
+        {
+            NDS::ReleaseScreen();
+            touching = false;
+        }
+        break;
+    }
+}
+
 void ScreenHandler::showCursor()
 {
     mainWindow->panel->setCursor(Qt::ArrowCursor);
@@ -801,6 +854,8 @@ ScreenPanelNative::ScreenPanelNative(QWidget* parent) : QWidget(parent)
 
     touching = false;
 
+    setAttribute(Qt::WA_AcceptTouchEvents);
+
     OSD::Init(nullptr);
 }
 
@@ -879,6 +934,23 @@ void ScreenPanelNative::mouseMoveEvent(QMouseEvent* event)
     screenOnMouseMove(event);
 }
 
+void ScreenPanelNative::tabletEvent(QTabletEvent* event)
+{
+    screenHandleTablet(event);
+}
+
+bool ScreenPanelNative::event(QEvent* event)
+{
+    if (event->type() == QEvent::TouchBegin
+        || event->type() == QEvent::TouchEnd
+        || event->type() == QEvent::TouchUpdate)
+    {
+        screenHandleTouch((QTouchEvent*)event);
+        return true;
+    }
+    return QWidget::event(event);
+}
+
 void ScreenPanelNative::onScreenLayoutChanged()
 {
     setMinimumSize(screenGetMinSize());
@@ -890,6 +962,7 @@ ScreenPanelGL::ScreenPanelGL(QWidget* parent) : QOpenGLWidget(parent)
 {
     touching = false;
 
+    setAttribute(Qt::WA_AcceptTouchEvents);
 }
 
 ScreenPanelGL::~ScreenPanelGL()
@@ -1090,6 +1163,23 @@ void ScreenPanelGL::mouseMoveEvent(QMouseEvent* event)
     screenOnMouseMove(event);
 }
 
+void ScreenPanelGL::tabletEvent(QTabletEvent* event)
+{
+    screenHandleTablet(event);
+}
+
+bool ScreenPanelGL::event(QEvent* event)
+{
+    if (event->type() == QEvent::TouchBegin
+        || event->type() == QEvent::TouchEnd
+        || event->type() == QEvent::TouchUpdate)
+    {
+        screenHandleTouch((QTouchEvent*)event);
+        return true;
+    }
+    return QWidget::event(event);
+}
+
 void ScreenPanelGL::onScreenLayoutChanged()
 {
     setMinimumSize(screenGetMinSize());

src/frontend/qt_sdl/main.h

@@ -110,6 +110,9 @@ protected:
     void screenOnMouseRelease(QMouseEvent* event);
     void screenOnMouseMove(QMouseEvent* event);
 
+    void screenHandleTablet(QTabletEvent* event);
+    void screenHandleTouch(QTouchEvent* event);
+
     float screenMatrix[Frontend::MaxScreenTransforms][6];
     int screenKind[Frontend::MaxScreenTransforms];
     int numScreens;
@@ -137,6 +140,8 @@ protected:
     void mouseReleaseEvent(QMouseEvent* event) override;
     void mouseMoveEvent(QMouseEvent* event) override;
 
+    void tabletEvent(QTabletEvent* event) override;
+    bool event(QEvent* event) override;
 private slots:
     void onScreenLayoutChanged();
 
@@ -168,6 +173,8 @@ protected:
     void mouseReleaseEvent(QMouseEvent* event) override;
     void mouseMoveEvent(QMouseEvent* event) override;
 
+    void tabletEvent(QTabletEvent* event) override;
+    bool event(QEvent* event) override;
 private slots:
     void onScreenLayoutChanged();