import {createTransform, createBoundingRect} from './utils/parser';

class TransformHandle {
    constructor(painter) {
        this.$painter = painter;

        this.parentLevel = painter.getParentLevel();

        this.rect = { x: 0, y: 0, width: 0, height: 0 };

        this.transform = createTransform({ scaleRate: 1, offsetX: 0, offsetY: 0 });
    }

    checkVisible(view) {
        if (view._type != 'Link') {
            return createBoundingRect(view).intersect(this.rect);
        } else {
            return true;
        }
    }

    revisibleView(view) {
        if (this.checkVisible(view)) {
            view.show();
        } else {
            view.hide();
        }

        view.dirty();
    }

    // 视图进行缩放/平移
    transformView(view) {
        if (view) {
            view.transform = this.transform;
            view.decomposeTransform();
            this.revisibleView(view);
        }
    }

    // 处理所有视图缩放/平移
    transformAll() {
        this.traverse(this.transformView, this);
    }

    // 重新计算显示图形
    revisibleAll() {
        this.traverse(this.revisibleView, this);
    }

    // 更新偏移量
    updateTransform(opts) {
        this.transform = createTransform(opts);
        this.transformAll();
    }

    // 更新画布尺寸
    updateZrSize(opts) {
        this.rect = { x: 0, y: 0, width: opts.width, height: opts.height };
        this.revisibleAll();
    }

    // 遍历group执行回调
    traverse(cb, context) {
        this.parentLevel.eachChild(level => {
            level.eachChild((view) => {
                cb.call(context, view);
            }, context);
        }, context);
    }
}

export default TransformHandle;