我正在尝试使用 mat-menu 构建上下文菜单,我觉得我已经很接近了。我希望菜单在用户右键单击的位置弹出。问题是它是在用户上次右击的地方弹出的,而不是他们当前右击的地方。我该如何解决这个问题?
HTML:
<span #contextMenuTrigger [matMenuTriggerFor]="contextMenu" class="context-menu-trigger" [style.left.px]="menuLeft" [style.top.px]="menuTop"></span>
<div (contextmenu)="openContextMenu($event)> stuff that I want right-click available to goes here</div>
<mat-menu #contextMenu="matMenu">
<button mat-menu-item>Item 1</button>
<button mat-menu-item>Item 2</button>
</mat-menu>
CSS:
.context-menu-trigger { position: absolute }
TS:
...
@Component( ... )
export class AppComponent {
@ViewChild(MatMenuTrigger) public menuTrigger : MatMenuTrigger;
public menuLeft = 0;
public menuTop = 0;
...
openContextMenu(event) {
event.preventDefault();
this.menuLeft = event.x;
this.menuTop = event.y;
this.menuTrigger.openMenu();
}
}
我们目前使用@angular 4.4 和@angular/material 2.0.0-beta.12。
最佳答案
依赖超时是不安全的。 为您的跨度触发器设置直接样式以获取即时位置更新:
<span style="position:fixed;" #spanTrigger class="context-menu-trigger" #matTrigger="matMenuTrigger" [matMenuTriggerFor]="contextMenu"></span>
<div (contextmenu)="openContextMenu($event, matTrigger, spanTrigger)> stuff that I want right-click available to goes here</div>
<mat-menu #contextMenu="matMenu">
<button mat-menu-item>Item 1</button>
<button mat-menu-item>Item 2</button>
</mat-menu>
处理程序:
openContextMenu(
event: MouseEvent,
trigger: MatMenuTrigger,
triggerElement: HTMLElement
) {
triggerElement.style.left = event.clientX + 5 + "px";
triggerElement.style.top = event.clientY + 5 + "px";
if (trigger.menuOpen) {
trigger.closeMenu();
trigger.openMenu();
} else {
trigger.openMenu();
}
event.preventDefault();
}
关于angular - 使用 mat-menu 作为上下文菜单 : getting the positioning right,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48412085/