const currentNodeIndex = node.index;

const parent = node.parent;

if (!parent) return [];

let layout = parent.getPropValue('layout');

if (!layout) return [];

layout = layout.split(':').map((item) => parseInt(item, 10));

// 最后一个节点不允许拖拽

if (currentNodeIndex >= layout.length - 1) {

return [];

}

return ['e'];

const { trigger } = e;

let nodeIndex = currentNode.index;

let startLayout = currentNode.parent.getPropValue('layout');

startLayout = startLayout.split(':').map((item) => parseInt(item, 10));

let eachWidth = currentNode.getRect().width / startLayout[nodeIndex];

// 暴露到currentNode节点上供onResize回调使用

currentNode.nodeIndex = nodeIndex;

currentNode.startLayout = startLayout;

currentNode.eachWidth = eachWidth;

const { trigger, deltaX, deltaY } = e;

const { nodeIndex, startLayout, eachWidth } = currentNode;

let moveColumn = Math.round(deltaX / eachWidth);

const layout = [...startLayout]; // 浅拷贝

if (moveColumn > 0) {

moveColumn = Math.min(moveColumn, layout[nodeIndex + 1] - 1);

} else {

moveColumn = -Math.min(-moveColumn, layout[nodeIndex] - 1);

}

layout[nodeIndex] += moveColumn;

layout[nodeIndex + 1] -= moveColumn;

// 获取下一个节点实例

let nextNode = currentNode.parent.children.filter((c, index) => {

return index === nodeIndex + 1;

});

// 为当前节点设置colSpan属性

currentNode.setPropValue('colSpan', layout[nodeIndex]);

// 为nextChild节点设置colSpan属性

if (nextNode && nextNode[0]) {

nextNode[0].setPropValue('colSpan', layout[nodeIndex + 1]);

}

// 为父容器设置layout属性

currentNode.parent.setPropValue('layout', layout.join(':'));