1 files changed, 98 insertions, 0 deletions
diff --git a/src/android/jar/src/org/qtproject/qt/android/QtRootLayout.java b/src/android/jar/src/org/qtproject/qt/android/QtRootLayout.java
new file mode 100644
index 0000000000..3dae587a71
--- /dev/null
+++ b/src/android/jar/src/org/qtproject/qt/android/QtRootLayout.java
@@ -0,0 +1,98 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2012 BogDan Vatra <bogdan@kde.org>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+package org.qtproject.qt.android;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.Build;
+import android.util.DisplayMetrics;
+import android.view.Display;
+import android.content.res.Configuration;
+import android.view.Surface;
+
+/**
+    A layout which corresponds to one Activity, i.e. is the root layout where the top level window
+    and handles orientation changes.
+*/
+public class QtRootLayout extends QtLayout
+{
+    private int m_activityDisplayRotation = -1;
+    private int m_ownDisplayRotation = -1;
+    private int m_nativeOrientation = -1;
+    private int m_previousRotation = -1;
+
+    public QtRootLayout(Context context)
+    {
+        super(context);
+    }
+
+    public void setActivityDisplayRotation(int rotation)
+    {
+        m_activityDisplayRotation = rotation;
+    }
+
+    public void setNativeOrientation(int orientation)
+    {
+        m_nativeOrientation = orientation;
+    }
+
+    public int displayRotation()
+    {
+        return m_ownDisplayRotation;
+    }
+
+    @Override
+    protected void onSizeChanged (int w, int h, int oldw, int oldh)
+    {
+        Activity activity = (Activity)getContext();
+        if (activity == null)
+            return;
+
+        DisplayMetrics realMetrics = new DisplayMetrics();
+        Display display = (Build.VERSION.SDK_INT < Build.VERSION_CODES.R)
+                ? activity.getWindowManager().getDefaultDisplay()
+                : activity.getDisplay();
+
+        if (display == null)
+            return;
+
+        display.getRealMetrics(realMetrics);
+        if ((realMetrics.widthPixels > realMetrics.heightPixels) != (w > h)) {
+            // This is an intermediate state during display rotation.
+            // The new size is still reported for old orientation, while
+            // realMetrics contain sizes for new orientation. Setting
+            // such parameters will produce inconsistent results, so
+            // we just skip them.
+            // We will have another onSizeChanged() with normal values
+            // a bit later.
+            return;
+        }
+        QtDisplayManager.setApplicationDisplayMetrics(activity, w, h);
+        QtDisplayManager.handleOrientationChanges(activity);
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration configuration)
+    {
+        Context context = getContext();
+        if (context instanceof Activity) {
+            Activity activity = (Activity)context;
+            //if orientation change is betwen invertedPortrait and portrait or
+            //invertedLandscape and landscape, we do not get sizeChanged callback.
+            int rotation = QtDisplayManager.getDisplayRotation(activity);
+            if (isSameSizeForOrientations(rotation, m_previousRotation))
+                QtDisplayManager.handleOrientationChanges(activity);
+            m_previousRotation = rotation;
+        }
+    }
+
+    public boolean isSameSizeForOrientations(int r1, int r2) {
+        return (r1 == r2) ||
+                (r1 == Surface.ROTATION_0 && r2 == Surface.ROTATION_180)
+                || (r1 == Surface.ROTATION_180 && r2 == Surface.ROTATION_0)
+                || (r1 == Surface.ROTATION_90 && r2 == Surface.ROTATION_270)
+                || (r1 == Surface.ROTATION_270 && r2 == Surface.ROTATION_90);
+    }
+}