Android: Implement QInputMethod::keyboardRectangle

We can use getWindowVisibleDisplayFrame to know the height on the
keyboard, and we can use getLocationOnScreen to find out how much
the view is scrolled. Since onPreDraw is always called when the
view is scrolled or when the keyboard appears or disapear, we can
call the native functions from there.

This is not working for floating keyboards.

[ChangeLog][Android] Implemented QInputMethod::keyboardRectangle

Task-number: QTBUG-40731
Change-Id: I7848eb34fece410b29a06bf0bbb2313112fffa68
Reviewed-by: Samuel Nevala <samuel.nevala@intopalo.com>
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java b/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java
index 445896622a..4575d8a1d3 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java
@@ -66,6 +66,8 @@ import android.view.ViewConfiguration;
 import android.view.ViewGroup;
 import android.view.WindowManager;
 import android.view.inputmethod.InputMethodManager;
+import android.view.ViewTreeObserver;
+import android.graphics.Rect;
 
 import java.io.BufferedReader;
 import java.io.DataOutputStream;
@@ -859,6 +861,25 @@ public class QtActivityDelegate
 
         QtNative.handleOrientationChanged(rotation, m_nativeOrientation);
         m_currentRotation = rotation;
+
+        m_layout.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
+            @Override
+            public boolean onPreDraw() {
+                if (!m_keyboardIsVisible)
+                    return true;
+
+                Rect r = new Rect();
+                m_activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(r);
+                DisplayMetrics metrics = new DisplayMetrics();
+                m_activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
+                final int kbHeight = metrics.heightPixels - r.bottom;
+                final int[] location = new int[2];
+                m_layout.getLocationOnScreen(location);
+                QtNative.keyboardGeometryChanged(location[0], r.bottom - location[1],
+                                                 r.width(), kbHeight);
+                return true;
+            }
+        });
     }
 
     public void initializeAccessibility()