// Copyright 2018 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

class ViewPainter {

private pendingViews: View[] = [];

draw(view: View) {

if (this.pendingViews.length == 0) {

window.requestAnimationFrame(() => {

for (let view of this.pendingViews) {

view.drawImpl();

}

this.pendingViews = [];

});

}

if (this.pendingViews.indexOf(view) == -1) {

this.pendingViews.push(view);

}

}

}

let painter = new ViewPainter();

abstract class View {

draw() { painter.draw(this); }

abstract drawImpl(): void;

}

export {View}