我想實(shí)現(xiàn)一個(gè)帶有靈活軌道的自定義滾動(dòng)條，該軌道可以使用 CSS 圍繞拇指展開。我嘗試實(shí)現(xiàn)類似引力透鏡效果的效果，就好像拇指（紅點(diǎn)）扭曲了它周圍的空間（見下圖）。重力透鏡應(yīng)隨拇指移動(dòng)。我怎樣才能做到這一點(diǎn)？
1 回答
偶然的你
TA貢獻(xiàn)1841條經(jīng)驗(yàn) 獲得超3個(gè)贊
首先：可以僅使用 HTML 和 CSS 構(gòu)建滾動(dòng)條，但需要使用 Javascript。
簡(jiǎn)單的滾動(dòng)條
您可以使用 position、border 和 border-radius 實(shí)現(xiàn)此外觀。軌道獲取左側(cè)和右側(cè)的邊框，拇指通過 border-radius: 50% 獲取所有側(cè)面的邊框，另外還有一個(gè)白色遮罩（軌道的寬度減去其邊框）用于隱藏軌道軌道內(nèi)的拇指邊框。當(dāng)然你還需要紅點(diǎn)。所有五個(gè)元素都會(huì)得到 position: absolute。
<div id="scrollbar">
<div id="track"></div>
<div id="thumb">
<div class="white_mask"></div>
<div id="red_dot"></div>
</div>
</div>
基本 CSS（無尺寸）
#scrollbar {
position: absolute;
}
#track {
position: absolute;
border-right: 3px solid #000;
border-left: 3px solid #000;
}
#thumb {
position: absolute;
border: 1px solid #000;
border-radius: 50%;
background-color: white;
}
.white_mask {
position: absolute;
background-color: white;
}
#red_dot {
position: absolute;
border-radius: 50%;
background-color: #9c0000;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
#container {
position: relative;
width: 100vw;
height: 100vh;
overflow: hidden;
}
#scrollbar {
position: absolute;
right: 100px;
top: 0;
width: 120px;
height: 100%;
z-index: 10;
}
#track {
position: absolute;
top: 0;
right: 20px;
width: 80px;
height: 100%;
border-right: 12px solid #000;
border-left: 12px solid #000;
}
#thumb {
position: absolute;
top: 0;
right: 0;
width: 120px;
height: 128px;
border: 4px solid #000;
border-top: 8px solid #000;
border-bottom: 8px solid #000;
border-radius: 50%;
background-color: white;
}
.white_mask {
position: absolute;
top: -8px;
right: 28px;
width: 56px;
height: 128px;
background-color: white;
}
.white_mask.big {
top: -16px;
right: 12px;
width: 88px;
height: 144px;
}
#thumb_mask {
position: absolute;
top: -16px;
left: 8px;
width: 96px;
height: 144px;
overflow: hidden;
}
.quarter_border {
position: absolute;
width: 80px;
height: 100px;
border-right: 12px solid #000;
border-left: 12px solid #000;
border-radius: 50%;
background-color: white;
}
.quarter_border.top {
top: -52px;
}
.quarter_border.right {
right: -60px;
}
.quarter_border.bottom {
bottom: -52px;
}
.quarter_border.left {
left: -60px;
}
#red_dot {
position: absolute;
top: 0;
left: 0;
width: 112px;
height: 112px;
border: 8px solid white;
border-radius: 50%;
background-color: #9c0000;
}
<div id="container">
<div id="scrollbar">
<div id="track"></div>
<div id="thumb">
<div class="white_mask"></div>
<div id="red_dot"></div>
</div>
</div>
</div>
高級(jí)滾動(dòng)條
由于拇指和軌道相互交匯處存在小角，因此您可以使用 overflow: hidden 在遮罩 div 中添加四個(gè)具有圓形邊框的附加 div，這樣四個(gè) div 中的四分之一即可可見的。您還需要在四個(gè) div 下使用第二個(gè)白色蒙版來隱藏角落。
要增加和減少border-width，您需要為上/下邊框和左/右邊框定義不同的值。此外，紅點(diǎn)需要一個(gè)白色邊框來平滑拇指邊框的內(nèi)部。
<div id="scrollbar">
<div id="track"></div>
<div id="thumb">
<div class="white_mask"></div>
<div class="white_mask small"></div>
<div id="thumb_mask">
<div class="quarter_border top right"></div>
<div class="quarter_border bottom right"></div>
<div class="quarter_border top left"></div>
<div class="quarter_border bottom left"></div>
</div>
<div id="red_dot"></div>
</div>
</div>
附加 CSS（無尺寸）
#thumb {
...
border-top: 2px solid #000;
border-bottom: 2px solid #000;
}
#thumb_mask {
position: absolute;
overflow: hidden;
}
.quarter_border {
position: absolute;
border-right: 3px solid #000;
border-left: 3px solid #000;
border-radius: 50%;
background-color: white;
}
#red_dot{
...
border: 2px solid white;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
#container {
position: relative;
width: 100vw;
height: 100vh;
overflow: hidden;
}
#scrollbar {
position: absolute;
right: 100px;
top: 0;
width: 120px;
height: 100%;
z-index: 10;
}
#track {
position: absolute;
top: 0;
right: 20px;
width: 80px;
height: 100%;
border-right: 12px solid #000;
border-left: 12px solid #000;
}
#thumb {
position: absolute;
top: 0;
right: 0;
width: 120px;
height: 128px;
border: 4px solid #000;
border-top: 8px solid #000;
border-bottom: 8px solid #000;
border-radius: 50%;
background-color: white;
}
.white_mask {
position: absolute;
top: -4px;
right: 28px;
width: 56px;
height: 128px;
background-color: white;
}
.white_mask.big {
top: -16px;
right: 12px;
width: 88px;
height: 144px;
}
#thumb_mask {
position: absolute;
top: -16px;
left: 8px;
width: 96px;
height: 144px;
overflow: hidden;
}
.quarter_border {
position: absolute;
width: 80px;
height: 100px;
border-right: 12px solid #000;
border-left: 12px solid #000;
border-radius: 50%;
background-color: white;
}
.quarter_border.top {
top: -52px;
}
.quarter_border.right {
right: -60px;
}
.quarter_border.bottom {
bottom: -52px;
}
.quarter_border.left {
left: -60px;
}
#red_dot {
position: absolute;
top: 0;
left: 0;
width: 112px;
height: 112px;
border: 8px solid white;
border-radius: 50%;
background-color: #9c0000;
}
<div id="container">
<div id="scrollbar">
<div id="track"></div>
<div id="thumb">
<div class="white_mask"></div>
<div class="white_mask big"></div>
<div id="thumb_mask">
<div class="quarter_border top right"></div>
<div class="quarter_border bottom right"></div>
<div class="quarter_border top left"></div>
<div class="quarter_border bottom left"></div>
</div>
<div id="red_dot"></div>
</div>
</div>
</div>
不幸的是，這些硬幣并不完全適合拇指和軌道。因此，將滾動(dòng)條構(gòu)建為 SVG 并操作其組件可能是更好的方法。
基礎(chǔ) JavaScript
有多種可能性和功能可以通過不同的屬性來操作滾動(dòng)條，例如top、scrollTop 或transform。我在這里僅用于演示top和一些基本功能（例如我省略了resize上滾動(dòng)位置的調(diào)整）。
基本常數(shù)
為了讓滾動(dòng)條首先工作，您需要三個(gè)常量thumb_height（包括其邊框）、scroll_range（最大拇指位置）和 diff_height（隱藏內(nèi)容）。
const thumb_height = thumb.getBoundingClientRect().height;
const scroll_range = window.innerHeight - thumb_height;
const diff_height = content.scrollHeight - window.innerHeight
滾動(dòng)功能
然后，您需要滾動(dòng)函數(shù)，在其中計(jì)算新的拇指位置和內(nèi)容滾動(dòng)，并設(shè)置兩個(gè)元素的樣式（如果拇指位于滾動(dòng)范圍內(nèi)）。
內(nèi)容滾動(dòng)是初始隱藏內(nèi)容的可見百分比。百分比的計(jì)算方式為：拇指位置除以其最大值（滾動(dòng)范圍）。
拖動(dòng)拇指：
您可以從 mousedown 事件中的鼠標(biāo)光標(biāo)位置獲取拇指位置：e.clientY（按拇指高度的一半進(jìn)行校正）。
您還必須確保當(dāng)拇指位置變得太小或太大時(shí)，例如離開容器（此處為窗口）時(shí)，拇指不會(huì)消失。因此，您必須檢查位置是否低于 0 或高于滾動(dòng)范圍，只有在沒有的情況下才對(duì)元素設(shè)置樣式。
function dragThumb(e) {
const thumb_pos = e.clientY - (thumb_height / 2);
const content_scroll = -diff_height * thumb_pos / scroll_range;
if (thumb_pos >= 0 && thumb_pos <= scroll_range) {
thumb.style.top = thumb_pos + 'px';
content.style.top = content_scroll + 'px';
}
}
對(duì)于鼠標(biāo)滾輪：
您可以從拇指增加或減少的實(shí)際 top 屬性獲取拇指位置（取決于 wheel 事件中的鼠標(biāo)滾輪方向：e.deltaY）固定量100（您可以修改該值以更快或更慢地滾動(dòng)）。
對(duì)于樣式，您還必須處理兩種極端條件，因?yàn)橹負(fù)粑恢茫ㄒ怨潭坑?jì)算）有時(shí)不會(huì)“落地”。正好在 0 或滾動(dòng)范圍上。您可以使用 if 塊來完成此操作，如 dragThumb() （您需要 3 個(gè)），或者您可以使用三元運(yùn)算符 ? :，如以下代碼片段。
function scrollContent(e) {
const thumb_pos = parseInt(thumb.style.top) + (e.deltaY < 0 ? -100 : 100);
const content_scroll = -diff_height * thumb_pos / scroll_range;
thumb.style.top = thumb_pos < 0 ? 0 : (thumb_pos > scroll_range ? scroll_range : thumb_pos) + 'px';
content.style.top = thumb_pos < 0 ? 0 : (thumb_pos > scroll_range ? -diff_height : content_scroll) + 'px';
}
事件監(jiān)聽器
最后，您需要一個(gè)事件監(jiān)聽器，您可以在其中調(diào)用滾動(dòng)函數(shù)。
對(duì)于鼠標(biāo)滾輪：
document.addEventListener('wheel', scrollContent);
拖動(dòng)拇指：
您需要兩個(gè)額外的事件偵聽器，一個(gè)僅在最初單擊拇指時(shí)偵聽鼠標(biāo)移動(dòng)，另一個(gè)用于在釋放鼠標(biāo)按鈕時(shí)刪除該鼠標(biāo)移動(dòng)偵聽器。
thumb.addEventListener('mousedown', function(e) {
e.preventDefault(); // fixed a bug with 'mouseup'
document.addEventListener('mousemove', dragThumb);
});
document.addEventListener('mouseup', function() {
document.removeEventListener('mousemove', dragThumb);
});
工作示例：
兩個(gè)滾動(dòng)函數(shù)都合并到函數(shù)scrollContent()中。拇指位置是在兩個(gè)事件處理程序（調(diào)用 scrollContent()）中計(jì)算的：dragThumb() 和 wheel 事件的匿名函數(shù)。
這三個(gè)常量是在頁面加載和窗口調(diào)整大小時(shí)調(diào)用的重置函數(shù)resetScroll()（因此定義為普通變量let）中計(jì)算的。該函數(shù)還使用實(shí)際的拇指位置調(diào)用滾動(dòng)函數(shù)scrollContent()。
因?yàn)?mouseup 的事件偵聽器“聾”如果事件發(fā)生在堆棧片段之外，我將其匿名函數(shù)轉(zhuǎn)換為函數(shù) stopDrag() ，該函數(shù)被稱為 mouseup 和 mouseleave
document.addEventListener('DOMContentLoaded', function() {
const thumb = document.getElementById('thumb');
const content = document.getElementById('content');
let thumb_height, scroll_range, diff_height;
function resetScroll() {
thumb_height = thumb.getBoundingClientRect().height;
scroll_range = window.innerHeight - thumb_height;
diff_height = content.scrollHeight - window.innerHeight;
scrollContent(parseInt(thumb.style.top));
}
function scrollContent(thumbPos) {
const newScroll = -diff_height * thumbPos / scroll_range;
thumb.style.top = thumbPos < 0 ? 0 : (thumbPos > scroll_range ? scroll_range : thumbPos) + 'px';
content.style.top = thumbPos < 0 ? 0 : (thumbPos > scroll_range ? -diff_height : newScroll) + 'px';
}
function dragThumb(e) {
scrollContent(e.clientY - (thumb_height / 2));
}
function stopDrag(e) {
document.removeEventListener('mousemove', dragThumb);
}
thumb.addEventListener('mousedown', function(e) {
e.preventDefault();
document.addEventListener('mousemove', dragThumb);
});
document.addEventListener('mouseup', stopDrag);
document.addEventListener("mouseleave", stopDrag);
document.addEventListener('wheel', function(e) {
if (!e.ctrlKey) {
scrollContent(parseInt(thumb.style.top) + (e.deltaY < 0 ? -100 : 100));
}
});
window.addEventListener('resize', resetScroll);
//initial reset
document.scrollTop = 0;
thumb.style.top = 0;
resetScroll();
});
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
#container {
position: relative;
overflow: hidden;
}
#content {
position: relative;
top: 0;
right: 0;
width: 100vw;
height: 100vh;
padding-right: 40px;
}
#scrollbar {
position: absolute;
right: 5px;
top: 0;
width: 30px;
height: 100%;
z-index: 10;
}
#track {
position: absolute;
top: 0;
right: 5px;
width: 20px;
height: 100%;
border-right: 3px solid #000;
border-left: 3px solid #000;
}
#thumb {
position: absolute;
top: 0;
right: 0;
width: 30px;
height: 32px;
border: 1px solid #000;
border-top: 2px solid #000;
border-bottom: 2px solid #000;
border-radius: 50%;
background-color: white;
}
.white_mask {
position: absolute;
top: -3px;
right: 6px;
width: 14px;
height: 30px;
background-color: white;
}
.white_mask.big {
top: -4px;
right: 3px;
width: 22px;
height: 36px;
}
#thumb_mask {
position: absolute;
top: -4px;
left: 2px;
width: 24px;
height: 36px;
overflow: hidden;
}
.quarter_border {
position: absolute;
width: 20px;
height: 25px;
border-right: 3px solid #000;
border-left: 3px solid #000;
border-radius: 50%;
background-color: white;
}
.quarter_border.top {
top: -13px;
}
.quarter_border.right {
right: -15px;
}
.quarter_border.bottom {
bottom: -13px;
}
.quarter_border.left {
left: -15px;
}
#red_dot {
position: absolute;
top: 0;
left: 0;
width: 28px;
height: 28px;
border: 2px solid white;
border-radius: 50%;
background-color: #9c0000;
}
<div id="container">
<div id="scrollbar">
<div id="track"></div>
<div id="thumb">
<div class="white_mask"></div>
<div class="white_mask big"></div>
<div id="thumb_mask">
<div class="quarter_border top right"></div>
<div class="quarter_border bottom right"></div>
<div class="quarter_border top left"></div>
<div class="quarter_border bottom left"></div>
</div>
<div id="red_dot"></div>
</div>
</div>
<div id="content">
<p>first</p>
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<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>last</p>
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