Android: generate QTabletEvents for stylus devices such as the S Pen

For example the Galaxy Note series of devices.  This makes possible
drawing applications which handle stylus events differently from touch
or mouse.  As on any other platform, if the application does not accept
the QTabletEvent, a QMouseEvent will be synthesized.
Also fix the tablet manual test to show larger circles on hidpi devices.

[ChangeLog][Android] stylus devices such as the S Pen generate
QTabletEvents

Task-number: QTBUG-38379
Change-Id: Ib594f453b8403cc06aa4e440a76f07afa3bac38c
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>

1 files changed, 43 insertions, 21 deletions

diff --git a/src/android/jar/src/org/qtproject/qt5/android/QtNative.java b/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
index b2480618f8..80f7fb5c85 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
@@ -43,6 +43,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.text.ClipboardManager;
+import android.os.Build;
 import android.util.Log;
 import android.view.ContextMenu;
 import android.view.Menu;
@@ -301,32 +302,49 @@ public class QtNative
 
     static public void sendTouchEvent(MotionEvent event, int id)
     {
-        //@ANDROID-5
-        touchBegin(id);
-        for (int i=0;i<event.getPointerCount();i++) {
-                touchAdd(id,
-                         event.getPointerId(i),
-                         getAction(i, event),
-                         i == 0,
-                         (int)event.getX(i),
-                         (int)event.getY(i),
-                         event.getSize(i),
-                         event.getPressure(i));
-        }
+        int pointerType = 0;
 
-        switch (event.getAction()) {
-            case MotionEvent.ACTION_DOWN:
-                touchEnd(id,0);
+        if (Build.VERSION.SDK_INT >= 14) {
+            switch (event.getToolType(0)) {
+            case MotionEvent.TOOL_TYPE_STYLUS:
+                pointerType = 1; // QTabletEvent::Pen
                 break;
-
-            case MotionEvent.ACTION_UP:
-                touchEnd(id,2);
+            case MotionEvent.TOOL_TYPE_ERASER:
+                pointerType = 3; // QTabletEvent::Eraser
                 break;
+            // TODO TOOL_TYPE_MOUSE
+            }
+        }
 
-            default:
-                touchEnd(id,1);
+        if (pointerType != 0) {
+            tabletEvent(id, event.getDeviceId(), event.getEventTime(), event.getAction(), pointerType,
+                event.getButtonState(), event.getX(), event.getY(), event.getPressure());
+        } else {
+            touchBegin(id);
+            for (int i = 0; i < event.getPointerCount(); ++i) {
+                    touchAdd(id,
+                             event.getPointerId(i),
+                             getAction(i, event),
+                             i == 0,
+                             (int)event.getX(i),
+                             (int)event.getY(i),
+                             event.getSize(i),
+                             event.getPressure(i));
+            }
+
+            switch (event.getAction()) {
+                case MotionEvent.ACTION_DOWN:
+                    touchEnd(id, 0);
+                    break;
+
+                case MotionEvent.ACTION_UP:
+                    touchEnd(id, 2);
+                    break;
+
+                default:
+                    touchEnd(id, 1);
+            }
         }
-        //@ANDROID-5
     }
 
     static public void sendTrackballEvent(MotionEvent event, int id)
@@ -592,6 +610,10 @@ public class QtNative
     public static native void longPress(int winId, int x, int y);
     // pointer methods
 
+    // tablet methods
+    public static native void tabletEvent(int winId, int deviceId, long time, int action, int pointerType, int buttonState, float x, float y, float pressure);
+    // tablet methods
+
     // keyboard methods
     public static native void keyDown(int key, int unicode, int modifier, boolean autoRepeat);
     public static native void keyUp(int key, int unicode, int modifier, boolean autoRepeat);