pointer event

https://github.com/kyorohiro/hello_skyengine/tree/master/dartui_event

// following code is checked in 2016/01/13
import 'dart:ui' as ui;
import 'package:vector_math/vector_math_64.dart';
import 'dart:typed_data';
import 'package:mojo/bindings.dart' as bindings;
import 'package:mojo/core.dart' as core;
import 'package:sky_services/pointer/pointer.mojom.dart';
// ex 3:4 game screen
double stageWidth = 800.0;
double stageHeight = 600.0;
ui.Rect stageSize = new ui.Rect.fromLTWH(0.0, 0.0, stageWidth, stageHeight);
//
//
double widthPaddingless = 0.0;
double heightPaddingless = 0.0;
double stageRatio = 0.0;
double stageTop = ui.window.padding.top;
double stageLeft = ui.window.padding.left + (widthPaddingless - stageWidth * stageRatio) / 2.0;
//
//
Map<int, PointerInfo> pointerInfos = {};
void onPaint(Duration timeStamp) {
ui.PictureRecorder recorder = new ui.PictureRecorder();
ui.Canvas canvas = new ui.Canvas(recorder, stageSize);
//
for (PointerInfo i in pointerInfos.values) {
ui.Paint paint = new ui.Paint();
paint.color = new ui.Color.fromARGB(0xff, 0xff, 0xaa, 0x77);
double size = i.pressure * 100;
ui.Rect drawRectSize = new ui.Rect.fromLTWH(i.x - size / 2.0, i.y - size / 2.0, size, size);
canvas.drawRect(drawRectSize, paint);
}
ui.Picture picture = recorder.endRecording();
ui.window.render(createScene(picture));
}
/*
void onEvent(ui.Event event) {
if (event is ui.PointerEvent) {
onPointerEvent(event);
}
if (event is ui.KeyboardEvent) {
onKeyboardEvent(event);
}
if (event is ui.WheelEvent) {
onWheelEvent(event);
}
ui.window.scheduleFrame();
}
*/
void handlePointerPacket(ByteData serializedPacket) {
bindings.Message message = new bindings.Message(
serializedPacket, <core.MojoHandle>[], serializedPacket.lengthInBytes, 0);
PointerPacket packet = PointerPacket.deserialize(message);
for (Pointer pointer in packet.pointers) {
onPointerEvent(pointer);
}
ui.window.scheduleFrame();
}
void onPointerEvent(Pointer event) {
if (!pointerInfos.containsKey(event.pointer)) {
pointerInfos[event.pointer] = new PointerInfo()
..x = event.x - stageLeft
..y = event.y - stageTop;
}
pointerInfos[event.pointer].x = (event.x / stageRatio) - stageLeft;
pointerInfos[event.pointer].y = (event.y / stageRatio) - stageTop;
pointerInfos[event.pointer].pressure = event.pressure / event.pressureMax;
switch (event.type) {
case PointerType.UP:
pointerInfos.remove(event.pointer);
break;
case PointerType.CANCEL:
pointerInfos.clear();
break;
}
}
/*
void onKeyboardEvent(ui.KeyboardEvent event) {}
void onWheelEvent(ui.WheelEvent event) {}
*/
void main() {
update();
ui.window.onBeginFrame = onPaint;
ui.window.onMetricsChanged = () {
update();
ui.window.scheduleFrame();
};
ui.window.onPointerPacket = handlePointerPacket;
// ui.window.onEvent = onEvent;
ui.window.scheduleFrame();
}
class PointerInfo {
double x = 0.0;
double y = 0.0;
double pressure = 0.0;
}
void update() {
widthPaddingless =
ui.window.size.width - ui.window.padding.left - ui.window.padding.right;
heightPaddingless =
ui.window.size.height - ui.window.padding.top - ui.window.padding.bottom;
double rw = widthPaddingless / stageWidth;
double rh = heightPaddingless / stageHeight;
stageRatio = (rw < rh ? rw : rh);
stageTop = ui.window.padding.top;
stageLeft = ui.window.padding.left +
(widthPaddingless - stageWidth * stageRatio) / 2.0;
}
ui.Scene createScene(ui.Picture picture) {
ui.Rect sceneBounds = new ui.Rect.fromLTWH(
0.0,
0.0,
ui.window.size.width * ui.window.devicePixelRatio,
ui.window.size.height * ui.window.devicePixelRatio);
Matrix4 mat = new Matrix4.identity();
mat.translate(stageLeft * ui.window.devicePixelRatio, stageTop * ui.window.devicePixelRatio);
mat.scale(stageRatio * ui.window.devicePixelRatio, stageRatio * ui.window.devicePixelRatio, 1.0);
ui.SceneBuilder sceneBuilder = new ui.SceneBuilder(sceneBounds);
sceneBuilder.pushTransform(mat.storage);
sceneBuilder.pushClipRect(stageSize);
sceneBuilder.addPicture(ui.Offset.zero, picture, stageSize);
sceneBuilder.pop();
sceneBuilder.pop();
return sceneBuilder.build();
}