Remove unused code in qwasmcompositor

Some dead code was left after transferring event support to QWasmWindow.
Remove it now.

Change-Id: I40e15bc62bcbb6fff071f53c45223c8a2d12e348
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

src/plugins/platforms/wasm/qwasmcompositor.cpp

@@ -3,19 +3,10 @@
 
 #include "qwasmcompositor.h"
 #include "qwasmwindow.h"
-#include "qwasmeventdispatcher.h"
-#include "qwasmclipboard.h"
-#include "qwasmevent.h"
-
-#include <QtGui/private/qwindow_p.h>
-
-#include <private/qguiapplication_p.h>
 
 #include <qpa/qwindowsysteminterface.h>
-#include <QtCore/qcoreapplication.h>
-#include <QtGui/qguiapplication.h>
 
-#include <emscripten/bind.h>
+#include <emscripten/html5.h>
 
 namespace {
 QWasmWindow *asWasmWindow(QWindow *window)
@@ -32,11 +23,7 @@ QWasmWindowStack::PositionPreference positionPreferenceFromWindowFlags(Qt::Windo
     return QWasmWindowStack::PositionPreference::Regular;
 }
 
-}  // namespace
-
-using namespace emscripten;
-
-Q_GUI_EXPORT int qt_defaultDpiX();
+} // namespace
 
 QWasmCompositor::QWasmCompositor(QWasmScreen *screen)
     : QObject(screen), m_windowStack(std::bind(&QWasmCompositor::onTopWindowChanged, this))
@@ -49,27 +36,6 @@ QWasmCompositor::~QWasmCompositor()
     if (m_requestAnimationFrameId != -1)
         emscripten_cancel_animation_frame(m_requestAnimationFrameId);
 
-    destroy();
-}
-
-void QWasmCompositor::onScreenDeleting()
-{
-    deregisterEventHandlers();
-}
-
-void QWasmCompositor::deregisterEventHandlers()
-{
-    QByteArray screenElementSelector = screen()->eventTargetId().toUtf8();
-
-    emscripten_set_touchstart_callback(screenElementSelector.constData(), 0, 0, NULL);
-    emscripten_set_touchend_callback(screenElementSelector.constData(), 0, 0, NULL);
-    emscripten_set_touchmove_callback(screenElementSelector.constData(), 0, 0, NULL);
-
-    emscripten_set_touchcancel_callback(screenElementSelector.constData(), 0, 0, NULL);
-}
-
-void QWasmCompositor::destroy()
-{
     // TODO(mikolaj.boc): Investigate if m_isEnabled is needed at all. It seems like a frame should
     // not be generated after this instead.
     m_isEnabled = false; // prevent frame() from creating a new m_context
@@ -228,11 +194,6 @@ void QWasmCompositor::handleBackingStoreFlush(QWindow *window)
         requestUpdateWindow(asWasmWindow(window));
 }
 
-int dpiScaled(qreal value)
-{
-    return value * (qreal(qt_defaultDpiX()) / 96.0);
-}
-
 void QWasmCompositor::frame(const QList<QWasmWindow *> &windows)
 {
     if (!m_isEnabled || !screen())

src/plugins/platforms/wasm/qwasmcompositor.h

@@ -7,21 +7,13 @@
 #include "qwasmwindowstack.h"
 
 #include <qpa/qplatformwindow.h>
+
 #include <QMap>
 
-#include <QtGui/qinputdevice.h>
-#include <QtCore/private/qstdweb_p.h>
-
-#include <emscripten/html5.h>
-#include <emscripten/emscripten.h>
-#include <emscripten/bind.h>
-
 QT_BEGIN_NAMESPACE
 
 class QWasmWindow;
 class QWasmScreen;
-class QOpenGLContext;
-class QOpenGLTexture;
 
 class QWasmCompositor final : public QObject
 {
@@ -39,8 +31,6 @@ public:
     void lower(QWasmWindow *window);
     void windowPositionPreferenceChanged(QWasmWindow *window, Qt::WindowFlags flags);
 
-    void onScreenDeleting();
-
     QWindow *windowAt(QPoint globalPoint, int padding = 0) const;
     QWindow *keyWindow() const;
 
@@ -58,16 +48,11 @@ private:
     void onTopWindowChanged();
 
     void deregisterEventHandlers();
-    void destroy();
 
     void requestUpdate();
     void deliverUpdateRequests();
     void deliverUpdateRequest(QWasmWindow *window, UpdateRequestDeliveryType updateType);
 
-    static int touchCallback(int eventType, const EmscriptenTouchEvent *ev, void *userData);
-
-    bool processTouch(int eventType, const EmscriptenTouchEvent *touchEvent);
-
     void updateEnabledState();
 
     QWasmWindowStack m_windowStack;

src/plugins/platforms/wasm/qwasmscreen.cpp

@@ -95,7 +95,6 @@ QWasmScreen::~QWasmScreen()
 
 void QWasmScreen::deleteScreen()
 {
-    m_compositor->onScreenDeleting();
     // Deletes |this|!
     QWindowSystemInterface::handleScreenRemoved(this);
 }