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Add hover event support to the engine (flutter/engine#6961)

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This adds support for passing ACTION_HOVER_MOVE events to the framework, in preparation for supporting mouse hover events on Android and ChromeOS.
This commit is contained in:
Greg Spencer 2019-01-14 16:15:20 -08:00 committed by GitHub
parent a4bf143f24
commit da656186ed
1 changed files with 33 additions and 7 deletions
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40
engine/src/flutter/shell/platform/android/io/flutter/view/FlutterView.java
View File

@ -338,7 +338,6 @@ public class FlutterView extends SurfaceView
Locale locale = config.locale;
// getScript() is gated because it is added in API 21.
mFlutterLocalizationChannel.invokeMethod("setLocale", Arrays.asList(locale.getLanguage(), locale.getCountry(), Build.VERSION.SDK_INT >= 21 ? locale.getScript() : "", locale.getVariant()));
}
@Override
@ -400,6 +399,10 @@ public class FlutterView extends SurfaceView
private static final int kPointerDeviceKindInvertedStylus = 3;
private static final int kPointerDeviceKindUnknown = 4;
// These values must match the unpacking code in hooks.dart.
private static final int kPointerDataFieldCount = 21;
private static final int kPointerBytesPerField = 8;
private int getPointerChangeForAction(int maskedAction) {
// Primary pointer:
if (maskedAction == MotionEvent.ACTION_DOWN) {
@ -419,6 +422,9 @@ public class FlutterView extends SurfaceView
if (maskedAction == MotionEvent.ACTION_MOVE) {
return kPointerChangeMove;
}
if (maskedAction == MotionEvent.ACTION_HOVER_MOVE) {
return kPointerChangeHover;
}
if (maskedAction == MotionEvent.ACTION_CANCEL) {
return kPointerChangeCancel;
}
@ -516,17 +522,13 @@ public class FlutterView extends SurfaceView
requestUnbufferedDispatch(event);
}
// These values must match the unpacking code in hooks.dart.
final int kPointerDataFieldCount = 21;
final int kBytePerField = 8;
// This value must match the value in framework's platform_view.dart.
// This flag indicates whether the original Android pointer events were batched together.
final int kPointerDataFlagBatched = 1;
int pointerCount = event.getPointerCount();
ByteBuffer packet = ByteBuffer.allocateDirect(pointerCount * kPointerDataFieldCount * kBytePerField);
ByteBuffer packet = ByteBuffer.allocateDirect(pointerCount * kPointerDataFieldCount * kPointerBytesPerField);
packet.order(ByteOrder.LITTLE_ENDIAN);
int maskedAction = event.getActionMasked();
@ -558,7 +560,9 @@ public class FlutterView extends SurfaceView
}
}
assert packet.position() % (kPointerDataFieldCount * kBytePerField) == 0;
if (packet.position() % (kPointerDataFieldCount * kPointerBytesPerField) != 0) {
throw new AssertionError("Packet position is not on field boundary");
}
mNativeView.getFlutterJNI().dispatchPointerDataPacket(packet, packet.position());
return true;
}
@ -577,6 +581,28 @@ public class FlutterView extends SurfaceView
return handled;
}
@Override
public boolean onGenericMotionEvent(MotionEvent event) {
if (!event.isFromSource(InputDevice.SOURCE_CLASS_POINTER) ||
event.getActionMasked() != MotionEvent.ACTION_HOVER_MOVE ||
!isAttached()) {
return super.onGenericMotionEvent(event);
}
int pointerChange = getPointerChangeForAction(event.getActionMasked());
ByteBuffer packet = ByteBuffer.allocateDirect(
event.getPointerCount() * kPointerDataFieldCount * kPointerBytesPerField);
packet.order(ByteOrder.LITTLE_ENDIAN);
// ACTION_HOVER_MOVE always applies to a single pointer only.
addPointerForIndex(event, event.getActionIndex(), pointerChange, 0, packet);
if (packet.position() % (kPointerDataFieldCount * kPointerBytesPerField) != 0) {
throw new AssertionError("Packet position is not on field boundary");
}
mNativeView.getFlutterJNI().dispatchPointerDataPacket(packet, packet.position());
return true;
}
@Override
protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {
mMetrics.physicalWidth = width;