Angular Material - 在组件级别覆盖覆盖 css [英] Angular Material - Override the overlay css at the component level

问题描述

我试图在 Angular 组件级别覆盖一些 cdk-overlay css，但它不起作用 - 即使我使用 :host ::ng-deep

这里的材料 select 下拉列表 (mat-select-content) 是 cdk-overlay-pane 的子项:

<div id="cdk-overlay-0" class="cdk-overlay-pane" style="..."><div class="ng-trigger ng-trigger-transformPanel ng-tns-c19-5 mat-select-panel ng-star-inserted mat-select-panel-done-animating" ng-reflect-klass="mat-选择面板" style="transform-origin: 50% 6.66667px 0px; font-size: 12px; opacity: 1; min-width: calc(100% + 32px); transform: scaleY(1);"><div class="mat-select-content ng-trigger ng-trigger-fadeInContent" style="opacity: 1;"><mat-option _ngcontent-c15="" class="mat-option mat-selected mat-active" role="option" value="Basic" ng-reflect-value="Basic" tabindex="0" id=mat-option-0"><span class="mat-option-text">基本</span><div class="mat-option-ripple mat-ripple"></div></mat-option><mat-option _ngcontent-c15="" class="mat-option" role="option" value="Advanced" ng-reflect-value="Advanced" id="mat-option-1"><span class="mat-option-text">高级</span><div class="mat-option-ripple mat-ripple"></div></mat-option>

我想将这个 css 从我的 main.scss 文件移动到组件级别，这样它就不会影响任何其他页面:

.cdk-overlay-container.dark-theme{.cdk-overlay-pane, .mat-select-content {//搜索面板背景:黑色；边框:.5px 实心 #323030；}}

但是当我将它移动到 my.component.scss 中时，它不起作用:

::ng-deep .cdk-overlay-pane, .mat-select-content {//搜索面板背景:黑色；边框:.5px 实心 #323030；} 

我还需要将此样式添加到我的组件 scss 中的 cdk-overlay-pane 类:

element.style {最小宽度:222.333px；指针事件:自动；字体大小:12px；顶部:115px；左:313px；变换:translateX(-16px);}

解决方案

覆盖容器内的内容不能从组件内设置样式，因为覆盖内容不是组件的子级.覆盖容器是页面 body 元素的子元素，因此其内容的样式需要驻留在您的全局样式中.但是，您可以使用 MatSelect 的 panelClass 属性有选择地将样式应用于覆盖容器内的特定选择面板:

....my-panel-class .mat-select-content {背景:黑色；边框:.5px 实心 #323030；}

I am trying to override some cdk-overlay css at the Angular component level, but it doesn't work - even if I use :host ::ng-deep

The material select dropdown here (mat-select-content) is a child of cdk-overlay-pane:

<div id="cdk-overlay-0" class="cdk-overlay-pane" style="...">
<div class="ng-trigger ng-trigger-transformPanel ng-tns-c19-5 mat-select-panel ng-star-inserted mat-select-panel-done-animating" ng-reflect-klass="mat-select-panel " style="transform-origin: 50% 6.66667px 0px; font-size: 12px; opacity: 1; min-width: calc(100% + 32px); transform: scaleY(1);">
<div class="mat-select-content ng-trigger ng-trigger-fadeInContent" style="opacity: 1;">
	<mat-option _ngcontent-c15="" class="mat-option mat-selected mat-active" role="option" value="Basic" ng-reflect-value="Basic" tabindex="0" id="mat-option-0">
		<span class="mat-option-text">Basic</span>
			<div class="mat-option-ripple mat-ripple"></div>
	</mat-option>
	<mat-option _ngcontent-c15="" class="mat-option" role="option" value="Advanced" ng-reflect-value="Advanced" id="mat-option-1">
		<span class="mat-option-text">Advanced</span><div class="mat-option-ripple mat-ripple"></div>
	</mat-option>
</div>
</div>
</div>

I want to move this css from my main.scss file into the component level, so it doesn't affect any other pages:

.cdk-overlay-container.dark-theme{

    .cdk-overlay-pane, .mat-select-content {    //  search panel
        background: black;
        border: .5px solid #323030;        
    } 
}

But when I move it into my.component.scss, IT DOESN'T WORK:

::ng-deep .cdk-overlay-pane, .mat-select-content {    // search panel
        background: black;
        border: .5px solid #323030;        
    } 

I also need to add this style to class cdk-overlay-pane in my component scss:

element.style {
    min-width: 222.333px;
    pointer-events: auto;
    font-size: 12px;
    top: 115px;
    left: 313px;
    transform: translateX(-16px);
}

解决方案

Content within the overlay container cannot be styled from within a component because the overlay content is not a child of the component. The overlay container is a child of the page's body element, so style for its content needs to reside in your global style. However, you can selectively apply style to a specific select panel inside the overlay container using the panelClass property of MatSelect:

<mat-select panelClass="my-panel-class">...

.my-panel-class .mat-select-content {
    background: black;
    border: .5px solid #323030;        
} 

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