我想在取消选择复选框后停止DragControls
功能。我尝试使用removeEventListener
,但它似乎不起作用。你知道吗 如何停用DragControls
?
let dragControls;
function dragControlsStart() {
dragControls.addEventListener('dragstart', function (event) {
controls.enabled = false;
});
dragControls.addEventListener('dragend', function (event) {
controls.enabled = true;
});
}
function dragControlsStop() {
dragControls.removeEventListener('dragstart', function (event) {
controls.enabled = false;
});
dragControls.removeEventListener('dragend', function (event) {
controls.enabled = true;
});
}
function dragAndDropActivate() {
let checkBox = document.getElementById("dragAndDropCheckbox");
dragControls = new THREE.DragControls(meshes, camera, renderer.domElement);
if (checkBox.checked == true) {
dragControlsStart();
}
else if (checkBox.checked == false) {
dragControlsStop();
}
}
看起来控件上有一个activate
和deactivate
功能,可以添加和删除所有事件,这听起来像您要查找的内容:
// create drag controls once and activate or deactivate
const dragControls = new THREE.DragControls(meshes, camera, renderer.domElement);
function dragAndDropActivate() {
let checkBox = document.getElementById("dragAndDropCheckbox");
if (checkBox.checked == true) {
dragControls.activate();
}
else if (checkBox.checked == false) {
dragControls.deactivate();
}
}
代码中需要注意的另一件事是,添加和删除事件的方式在Javascript
不起作用,因为每次调用这些函数时都会创建新的函数句柄。相反,您希望创建一个函数一次,并在添加或删除侦听器时使用相同的引用。
function dragEndCallback(event) {
// ...
}
dragControls.addEventListener('dragEnd', dragEndCallback);
dragControls.removeEventListener('dragEnd', dragEndCallback);
希望对您有所帮助!
解决方案:
let dragControls = new THREE.DragControls(ArrayOfMesh, camera, renderer.domElement);
dragControls.addEventListener('dragstart', function (event) {
controls.enabled = false;
});
dragControls.addEventListener('dragend', function (event) {
controls.enabled = true;
});
dragControls.deactivate();
function dragAndDropActivate() {
let checkBox = document.getElementById("dragAndDropCheckbox");
if (checkBox.checked == true) {
dragControls.activate();
}
else if (checkBox.checked == false) {
dragControls.deactivate();
}
}