Do you think the original scroll bars that come with the browser are very unsightly? At the same time, you have also seen that the customized scroll bars of many websites look high-end. Even the chrome32.0 development board has abandoned the original scroll bars and is much more beautiful. . So how does the webkit browser customize the scroll bar?

Preface

Webkit supports areas with overflow attributes, list boxes, drop-down menus, and textarea scroll bar custom styles, so it is quite useful. Of course, there is currently no scroll bar style that is compatible with all browsers.

Demo

Let’s take a look at these two scroll bar demos: demo1 (picture version), demo2 (pure CSS3 version)

Scroll bar composition

• ::-webkit-scrollbar The whole part of the scroll bar

• ::-webkit-scrollbar-thumb The small square inside the scroll bar can Move up and down (or left and right, depending on whether it is a vertical scroll bar or a horizontal scroll bar)

• ::-webkit-scrollbar-track The track of the scroll bar (which contains Thumb)

• ::-webkit-scrollbar-button Buttons at both ends of the scroll bar's track allow fine-tuning the position of the small square by clicking on it.

• ::-webkit-scrollbar-track-piece The inner track, the middle part of the scroll bar (removed)

• ::-webkit- scrollbar-corner corner, that is, the intersection of two scroll bars

• ::-webkit-resizer The small corner at the intersection of two scroll bars that is used to adjust the size of the element by dragging Control

Concise version

The detailed code will not be posted here. You can find the specific style settings by viewing the source code in the demo. Let’s take a look at the style of the second scroll bar in demo2

/*定義滾動(dòng)條高寬及背景 高寬分別對(duì)應(yīng)橫豎滾動(dòng)條的尺寸*/
::-webkit-scrollbar
{
	width: 16px;
	height: 16px;
	background-color: #F5F5F5;
}

/*定義滾動(dòng)條軌道 內(nèi)陰影+圓角*/
::-webkit-scrollbar-track
{
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
	border-radius: 10px;
	background-color: #F5F5F5;
}

/*定義滑塊 內(nèi)陰影+圓角*/
::-webkit-scrollbar-thumb
{
	border-radius: 10px;
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
	background-color: #555;
}

Detailed settings

To define scroll bars is to use pseudo elements and pseudo classes. So what are pseudo elements and pseudo classes?

Everyone should be familiar with pseudo-classes: link, :focus, :hover. In addition, many pseudo- class selectors have been added to CSS3, such as :nth-child, :last-child, :nth-last-of-type() etc.

You have seen the pseudo elements in CSS before: :first-line,:first-letter,:before,:after. Then in CSS3, the pseudo-element has been adjusted, and a ":" has been added to the previous one, which is now "::first-letter,::first-line,::before,::after", In addition, CSS3 also adds a "::selection". Two "::" and one ":" are mainly used to distinguish pseudo-classes and pseudo-elements in CSS3.

Webkit’s implementation of pseudo-classes and pseudo-elements is very strong. You can define the scroll bar as a page element, and then combine it with some advanced CSS3 attributes, such as gradients, rounded corners, RGBa, etc. Then if you need to use images in some places, you can also convert the images to Base64, otherwise you have to load multiple images every time and increase the number of requests.

Any object can be set: borders, shadows, background images, etc. The created scroll bar will still complete its interactive behavior according to the settings of the operating system itself. The following pseudo-classes can be applied to the above pseudo-elements. It's a bit complicated. For details on how to write it, you can see the first demo. There are also comments there.

:horizontal
//horizontal偽類(lèi)適用于任何水平方向上的滾動(dòng)條

:vertical
//vertical偽類(lèi)適用于任何垂直方向的滾動(dòng)條

:decrement
//decrement偽類(lèi)適用于按鈕和軌道碎片。表示遞減的按鈕或軌道碎片，例如可以使區(qū)域向上或者向右移動(dòng)的區(qū)域和按鈕

:increment
//increment偽類(lèi)適用于按鈕和軌道碎片。表示遞增的按鈕或軌道碎片，例如可以使區(qū)域向下或者向左移動(dòng)的區(qū)域和按鈕

:start
//start偽類(lèi)適用于按鈕和軌道碎片。表示對(duì)象（按鈕 軌道碎片）是否放在滑塊的前面

:end
//end偽類(lèi)適用于按鈕和軌道碎片。表示對(duì)象（按鈕 軌道碎片）是否放在滑塊的后面

:double-button
//double-button偽類(lèi)適用于按鈕和軌道碎片。判斷軌道結(jié)束的位置是否是一對(duì)按鈕。也就是軌道碎片緊挨著一對(duì)在一起的按鈕。

:single-button
//single-button偽類(lèi)適用于按鈕和軌道碎片。判斷軌道結(jié)束的位置是否是一個(gè)按鈕。也就是軌道碎片緊挨著一個(gè)單獨(dú)的按鈕。

:no-button
no-button偽類(lèi)表示軌道結(jié)束的位置沒(méi)有按鈕。

:corner-present
//corner-present偽類(lèi)表示滾動(dòng)條的角落是否存在。

:window-inactive
//適用于所有滾動(dòng)條，表示包含滾動(dòng)條的區(qū)域，焦點(diǎn)不在該窗口的時(shí)候。

::-webkit-scrollbar-track-piece:start {
/*滾動(dòng)條上半邊或左半邊*/
}

::-webkit-scrollbar-thumb:window-inactive {
/*當(dāng)焦點(diǎn)不在當(dāng)前區(qū)域滑塊的狀態(tài)*/
}

::-webkit-scrollbar-button:horizontal:decrement:hover {
/*當(dāng)鼠標(biāo)在水平滾動(dòng)條下面的按鈕上的狀態(tài)*/
}

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