wasm: deregister event handlers

Pick-to: 5.15
Change-Id: I453b87497c7ed93b92bf9f4c59ab1c8bd1d7712e
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

2 files changed, 22 insertions, 0 deletions

diff --git a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
index 8c0d2e21e0..82dd00bb65 100644
--- a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
+++ b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
@@ -337,6 +337,27 @@ QWasmEventTranslator::QWasmEventTranslator(QWasmScreen *screen)
     initEventHandlers();
 }
 
+QWasmEventTranslator::~QWasmEventTranslator()
+{
+    // deregister event handlers
+    QByteArray canvasSelector = "#" + screen()->canvasId().toUtf8();
+    emscripten_set_keydown_callback(canvasSelector.constData(), 0, 0, NULL);
+    emscripten_set_keyup_callback(canvasSelector.constData(),  0, 0, NULL);
+
+    emscripten_set_mousedown_callback(canvasSelector.constData(), 0, 0, NULL);
+    emscripten_set_mouseup_callback(canvasSelector.constData(),  0, 0, NULL);
+    emscripten_set_mousemove_callback(canvasSelector.constData(),  0, 0, NULL);
+
+    emscripten_set_focus_callback(canvasSelector.constData(),  0, 0, NULL);
+
+    emscripten_set_wheel_callback(canvasSelector.constData(),  0, 0, NULL);
+
+    emscripten_set_touchstart_callback(canvasSelector.constData(),  0, 0, NULL);
+    emscripten_set_touchend_callback(canvasSelector.constData(),  0, 0, NULL);
+    emscripten_set_touchmove_callback(canvasSelector.constData(),  0, 0, NULL);
+    emscripten_set_touchcancel_callback(canvasSelector.constData(),  0, 0, NULL);
+}
+
 void QWasmEventTranslator::initEventHandlers()
 {
     QByteArray canvasSelector = "#" + screen()->canvasId().toUtf8();
diff --git a/src/plugins/platforms/wasm/qwasmeventtranslator.h b/src/plugins/platforms/wasm/qwasmeventtranslator.h
index f6c95770e9..b02685bedd 100644
--- a/src/plugins/platforms/wasm/qwasmeventtranslator.h
+++ b/src/plugins/platforms/wasm/qwasmeventtranslator.h
@@ -49,6 +49,7 @@ class QWasmEventTranslator : public QObject
 public:
 
     explicit QWasmEventTranslator(QWasmScreen *screen);
+    ~QWasmEventTranslator();
 
     static int keyboard_cb(int eventType, const EmscriptenKeyboardEvent *keyEvent, void *userData);
     static int mouse_cb(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);