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我正在使用 Konvajs，我有一组文本，并且我希望不允许在画布之外拖动组，我尝试使用 dragBoundFunc 解决了这个问题，但这对我没有帮助，现在我只是尝试更改组位置在 dragmove 期间，但是 setPosition、setAbslutePosition，没有任何东西可以让我更改组位置

stage.on('dragmove', (e) => stageOnDragMove(e, layer));
const stageOnDragMove = (e: Konva.KonvaEventObject<any>, layer: Konva.Layer) => {

    const selectionGroup = layer.findOne('#selection-group');
    const transformer = layer.findOne<Konva.Transformer>('Transformer');

    if (selectionGroup?.hasName('text-group')) {
        const pos = selectionGroup.getClientRect({});

        if (pos.x <= 0 || pos.y <= 0) {
            selectionGroup.setAbsolutePosition({
                x: 0,
                y: 0
            });
            layer.draw();
        }
    }

    transformer.attachTo(selectionGroup);
};
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1 回答 1

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您可以使用此功能来限制拖放和调整功能以限制其边界：

shape.on('dragmove transform', () => {
  const box = shape.getClientRect();
  const absPos = shape.getAbsolutePosition();
  const offsetX = box.x - absPos.x;
  const offsetY = box.y - absPos.y;

  const newAbsPos = {...absPos}
  if (box.x < 0) {
    newAbsPos.x = -offsetX;
  }
  if (box.y < 0) {
    newAbsPos.y = -offsetY;
  }
  if (box.x + box.width > stage.width()) {
    newAbsPos.x = stage.width() - box.width - offsetX;
  }
  if (box.y + box.height > stage.height()) {
    newAbsPos.y = stage.height() - box.height - offsetY;
  }
  shape.setAbsolutePosition(newAbsPos)
})

演示：https ://jsbin.com/rofupicupu/edit?html,js,output

于 2020-04-02T15:40:25.260 回答