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版本
本例使用 Angular 7.x 版本，Material 7.x 版本。
新建 Angular 指令
新建指令命令：
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| ng generate directive dialog-draggable
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指令中拖拽功能代码实现：
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| import { Directive, HostListener, OnInit } from '@angular/core';
import { MatDialogContainer, MatDialogRef } from '@angular/material';
import { Subscription, fromEvent } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
export interface Position {
x: number;
y: number;
}
@Directive({
selector: '[dialog-draggable]'
})
export class DialogDraggableDirective implements OnInit {
private _subscription: Subscription;
mouseStart: Position;
mouseDelta: Position;
offset: Position;
constructor(
private matDialogRef: MatDialogRef<any>,
private container: MatDialogContainer
) {
}
ngOnInit() {
this.offset = this._getOffset();
this._updatePosition(this.offset.y, this.offset.x);
}
@HostListener('mousedown', ['$event'])
onMouseDown(event: MouseEvent) {
this.mouseStart = { x: event.pageX, y: event.pageY };
const mouseup$ = fromEvent(document, 'mouseup');
this._subscription = mouseup$.subscribe(() => this.onMouseup());
const mousemove$ = fromEvent(document, 'mousemove')
.pipe(takeUntil(mouseup$))
.subscribe((e: MouseEvent) => this.onMouseMove(e));
this._subscription.add(mousemove$);
}
onMouseMove(event: MouseEvent) {
this.mouseDelta = { x: (event.pageX - this.mouseStart.x), y: (event.pageY - this.mouseStart.y) };
this._updatePosition(this.offset.y + this.mouseDelta.y, this.offset.x + this.mouseDelta.x);
}
onMouseup() {
if (this._subscription) {
this._subscription.unsubscribe();
this._subscription = undefined;
}
if (this.mouseDelta) {
this.offset.x += this.mouseDelta.x;
this.offset.y += this.mouseDelta.y;
}
}
private _updatePosition(top: number, left: number) {
this.matDialogRef.updatePosition({
top: top + 'px',
left: left + 'px'
});
}
private _getOffset(): Position {
const box = this.container['_elementRef'].nativeElement.getBoundingClientRect();
return {
x: box.left + pageXOffset,
y: box.top + pageYOffset
};
}
}
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在全局的 CSS 样式文件添加 CSS：
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| [dialog-draggable] {
margin: -24px -24px 20px -24px !important;
padding: 10px 24px;
background: #283593 !important;
color: #fff;
cursor: move;
}
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如何使用
在 Dialog 组件中使用 dialog-draggable 指令即可实现窗口拖拽，如下：
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| <h2 mat-dialog-title dialog-draggable>
Angular Material Dialog Draggable
</h2>
|
