Android: Resize QWindow when its QtView is resized

If the Android View is resized, the QWindow instantiated by it
should be resized accordingly.

Task-number: QTBUG-122626
Change-Id: I7bfbca149f927718d1e28cdabfa8759afbd06039
Reviewed-by: Tinja Paavoseppä <tinja.paavoseppa@qt.io>

3 files changed, 26 insertions, 1 deletions

diff --git a/src/android/jar/src/org/qtproject/qt/android/QtView.java b/src/android/jar/src/org/qtproject/qt/android/QtView.java
index 9a43b8aa74..d7c2ad5bcf 100644
--- a/src/android/jar/src/org/qtproject/qt/android/QtView.java
+++ b/src/android/jar/src/org/qtproject/qt/android/QtView.java
@@ -40,6 +40,7 @@ abstract class QtView extends QtLayout {
     abstract protected void createWindow(long parentWindowRef);
 
     private static native void setWindowVisible(long windowReference, boolean visible);
+    private static native void resizeWindow(long windowReference, int width, int height);
 
     /**
      * Create QtView for embedding a QWindow. Instantiating a QtView will load the Qt libraries
@@ -59,6 +60,20 @@ abstract class QtView extends QtLayout {
         QtEmbeddedLoader loader = new QtEmbeddedLoader(context);
         m_delegate = QtEmbeddedDelegateFactory.create((Activity)context);
         loader.setMainLibraryName(appLibName);
+        addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
+            @Override
+            public void onLayoutChange(View v, int left, int top, int right, int bottom,
+                                       int oldLeft, int oldTop, int oldRight, int oldBottom)  {
+                if (m_windowReference != 0L) {
+                    final int oldWidth = oldRight - oldLeft;
+                    final int oldHeight = oldBottom - oldTop;
+                    final int newWidth = right - left;
+                    final int newHeight = bottom - top;
+                    if (oldWidth != newWidth || oldHeight != newHeight)
+                        resizeWindow(m_windowReference, right - left, bottom - top);
+                }
+            }
+        });
         loader.loadQtLibraries();
         // Start Native Qt application
         m_delegate.startNativeApplication(loader.getApplicationParameters(),
diff --git a/src/plugins/platforms/android/androidwindowembedding.cpp b/src/plugins/platforms/android/androidwindowembedding.cpp
index 7d82ac6d87..e72bb326cc 100644
--- a/src/plugins/platforms/android/androidwindowembedding.cpp
+++ b/src/plugins/platforms/android/androidwindowembedding.cpp
@@ -45,6 +45,13 @@ namespace QtAndroidWindowEmbedding {
         });
     }
 
+    void resizeWindow(JNIEnv *, jclass, jlong windowRef, jint width, jint height)
+    {
+        QWindow *window = reinterpret_cast<QWindow*>(windowRef);
+        window->setWidth(width);
+        window->setHeight(height);
+    }
+
     bool registerNatives(QJniEnvironment& env) {
         using namespace QtJniTypes;
         bool success = env.registerNativeMethods(Traits<QtEmbeddedDelegate>::className(),
@@ -52,7 +59,8 @@ namespace QtAndroidWindowEmbedding {
                              Q_JNI_NATIVE_SCOPED_METHOD(deleteWindow, QtAndroidWindowEmbedding)});
 
         success &= env.registerNativeMethods(Traits<QtView>::className(),
-                            {Q_JNI_NATIVE_SCOPED_METHOD(setWindowVisible, QtAndroidWindowEmbedding)});
+                            {Q_JNI_NATIVE_SCOPED_METHOD(setWindowVisible, QtAndroidWindowEmbedding),
+                             Q_JNI_NATIVE_SCOPED_METHOD(resizeWindow, QtAndroidWindowEmbedding)});
         return success;
 
     }
diff --git a/src/plugins/platforms/android/androidwindowembedding.h b/src/plugins/platforms/android/androidwindowembedding.h
index f9d92d4afc..4f3261a30b 100644
--- a/src/plugins/platforms/android/androidwindowembedding.h
+++ b/src/plugins/platforms/android/androidwindowembedding.h
@@ -31,6 +31,8 @@ namespace QtAndroidWindowEmbedding
     Q_DECLARE_JNI_NATIVE_METHOD_IN_CURRENT_SCOPE(deleteWindow)
     void setWindowVisible(JNIEnv *, jclass, jlong window, jboolean visible);
     Q_DECLARE_JNI_NATIVE_METHOD_IN_CURRENT_SCOPE(setWindowVisible)
+    void resizeWindow(JNIEnv *, jclass, jlong windowRef, jint width, jint height);
+    Q_DECLARE_JNI_NATIVE_METHOD_IN_CURRENT_SCOPE(resizeWindow)
 };
 
 QT_END_NAMESPACE