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onUiLoaded(function () {
let imageContainer = document.getElementById("lightboxModal");
imageContainer.style.width = "100%";
imageContainer.style.height = "100%";
imageContainer.style.overflow = "hidden";
function disableClose(e) {
e.stopPropagation();
}
let modalControls = imageContainer.getElementsByClassName("modalControls")[0];
if (modalControls) {
modalControls.style.position = "relative";
modalControls.style.zIndex = 1;
}
let img = imageContainer.querySelector("img");
img.style.width = "auto";
img.style.maxWidth = "100%";
img.style.height = "auto";
img.style.maxHeight = "100%";
let scale = 1;
let lastX = 0;
let lastY = 0;
let lastLen = 1;
let offsetX = 0;
let offsetY = 0;
let isDragging = false;
let touchStore = {};
let moveFunTimer = setTimeout(() => {}, 0);
let moveFunLastExecTime = Date.now();
let event = {
wheel: function (event) {
event.stopPropagation();
event.preventDefault();
img.style.transition = "transform 0.3s ease";
let delta = Math.max(-1, Math.min(1, event.wheelDelta || -event.detail));
let zoomStep = 0.1;
let zoom = 1 + delta * zoomStep;
let lastScale = scale;
scale *= zoom;
scale = Math.max(0.1, scale);
// 图片中心坐标
let centerX = imageContainer.offsetWidth / 2;
let centerY = imageContainer.offsetHeight / 2;
// 图片中心坐标
let imgCenterX = offsetX + centerX;
let imgCenterY = offsetY + centerY;
// 缩放后坐标偏移 = 缩放后图片中心坐标 - 页面中心坐标
// 缩放后图片中心坐标 = 缩放中心坐标 - 缩放后距离
// 缩放后距离 = (缩放前距离 / 之前的缩放比) *之后的缩放比
// 缩放前距离 = 缩放中心坐标 - 之前的图片中心坐标
// 之前的图片中心坐标 = 页面中心坐标 + 坐标偏移
offsetX =
event.clientX -
((event.clientX - imgCenterX) / lastScale) * scale -
centerX;
offsetY =
event.clientY -
((event.clientY - imgCenterY) / lastScale) * scale -
centerY;
img.style.transform =
"translate(" + offsetX + "px, " + offsetY + "px) scale(" + scale + ")";
},
mousedown: function (event) {
event.stopPropagation();
isDragging = true;
lastX = event.clientX - offsetX;
lastY = event.clientY - offsetY;
img.style.cursor = "grabbing";
},
mousemove: function (event) {
if (isDragging) {
img.style.transition = "";
event.stopPropagation();
event.preventDefault();
img.onclick = disableClose;
let deltaX = event.clientX - lastX;
let deltaY = event.clientY - lastY;
offsetX = deltaX;
offsetY = deltaY;
img.style.transform =
"translate(" + deltaX + "px, " + deltaY + "px) scale(" + scale + ")";
}
},
mouseup: function (event) {
event.stopPropagation();
isDragging = false;
img.style.cursor = "grab";
},
mouseleave: function (event) {
event.stopPropagation();
isDragging = false;
img.style.cursor = "grab";
},
reset() {
scale = 1;
lastX = 0;
lastY = 0;
last2X = 0;
last2Y = 0;
offsetX = 0;
offsetY = 0;
touchStore = {};
img.style.transform = "none";
img.onclick = undefined;
},
touchcancel: function (event) {
event.stopPropagation();
event.preventDefault();
img.onclick = undefined;
img.style.transition = "";
// 获取手势缩放比例
let newScale = scale * event.scale;
// 设置img标签的样式，实现缩放效果
img.style.transform =
"translate(" + offsetX + "px, " + offsetY + "px) scale(" + scale + ")";
},
touchend: function (event) {
// 更新缩放比例
event.stopPropagation();
img.onclick = undefined;
if (!event.targetTouches.length) {
touchStore.tpuchScale = false;
}
},
touchstart: function (event) {
event.stopPropagation();
if (!touchStore.tpuchScale) {
lastX = event.targetTouches[0].clientX - offsetX;
lastY = event.targetTouches[0].clientY - offsetY;
}
if (event.targetTouches[1]) {
touchStore.tpuchScale = true;
touchStore.last1X = event.targetTouches[0].clientX;
touchStore.last1Y = event.targetTouches[0].clientY;
touchStore.last2X = event.targetTouches[1].clientX;
touchStore.last2Y = event.targetTouches[1].clientY;
touchStore.scale = scale;
lastLen = Math.sqrt(
Math.pow(touchStore.last2X - touchStore.last1X, 2) +
Math.pow(touchStore.last2Y - touchStore.last1Y, 2)
);
}
},
touchmove: function (event) {
event.stopPropagation();
event.preventDefault();
img.onclick = disableClose;
if (event.targetTouches[1]) {
touchStore.delta1X = event.targetTouches[0].clientX;
touchStore.delta1Y = event.targetTouches[0].clientY;
touchStore.delta2X = event.targetTouches[1].clientX;
touchStore.delta2Y = event.targetTouches[1].clientY;
let centerX = imageContainer.offsetWidth / 2;
let centerY = imageContainer.offsetHeight / 2;
let deltaLen = Math.sqrt(
Math.pow(touchStore.delta2X - touchStore.delta1X, 2) +
Math.pow(touchStore.delta2Y - touchStore.delta1Y, 2)
);
let zoom = deltaLen / lastLen;
let lastScale = scale;
scale = touchStore.scale * zoom;
scale = Math.max(0.1, scale);
// 当前缩放中心坐标
let deltaCenterX =
touchStore.delta1X + (touchStore.delta2X - touchStore.delta1X) / 2;
let deltaCenterY =
touchStore.delta1Y + (touchStore.delta2Y - touchStore.delta1Y) / 2;
// 图片中心坐标
let imgCenterX = offsetX + centerX;
let imgCenterY = offsetY + centerY;
// 计算缩放后的图片中心偏移
offsetX =
deltaCenterX -
((deltaCenterX - imgCenterX) / lastScale) * scale -
centerX;
offsetY =
deltaCenterY -
((deltaCenterY - imgCenterY) / lastScale) * scale -
centerY;
function moveFun() {
if (Date.now() - moveFunLastExecTime < 5) return;
img.style.transition = "transform 0.3s ease";
img.style.transform =
"translate(" +
offsetX +
"px, " +
offsetY +
"px) scale(" +
scale +
")";
}
if (Date.now() - moveFunLastExecTime >= 50) {
moveFun();
moveFunLastExecTime = Date.now();
} else {
clearTimeout(moveFunTimer);
moveFunTimer = setTimeout(() => {
moveFun();
}, 50);
}
} else if (!touchStore.tpuchScale) {
img.style.transition = "";
offsetX = event.targetTouches[0].clientX - lastX;
offsetY = event.targetTouches[0].clientY - lastY;
img.style.transform =
"translate(" +
offsetX +
"px, " +
offsetY +
"px) scale(" +
scale +
")";
}
},
};
function reloadZoomEvent(new_event) {
if (!new_event) return;
imageContainer.removeEventListener("click", event.reset);
imageContainer.removeEventListener("wheel", event.wheel);
img.removeEventListener("mousedown", event.mousedown);
img.removeEventListener("mousemove", event.mousemove);
img.removeEventListener("mouseup", event.mouseup);
img.removeEventListener("mouseleave", event.mouseleave);
// 移动端
imageContainer.removeEventListener("touchend", event.touchend);
imageContainer.removeEventListener("touchstart", event.touchstart);
imageContainer.removeEventListener("touchmove", event.touchmove);
event = new_event;
imageContainer.addEventListener("click", event.reset);
imageContainer.addEventListener("wheel", event.wheel);
img.addEventListener("mousedown", event.mousedown);
img.addEventListener("mousemove", event.mousemove);
img.addEventListener("mouseup", event.mouseup);
img.addEventListener("mouseleave", event.mouseleave);
img.ondrag =
img.ondragend =
img.ondragstart =
function (e) {
e.stopPropagation();
e.preventDefault();
};
// 移动端
imageContainer.addEventListener("touchend", event.touchend);
imageContainer.addEventListener("touchstart", event.touchstart);
imageContainer.addEventListener("touchmove", event.touchmove);
}
reloadZoomEvent(event);
});
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