Table支持拖拽改变列宽

[chenling1983]

What problem does this feature solve?

由于多语言化需求，对于英文字符较长，列宽无法有效的设置，设置太长则页页不美观，太短，又无法显示完整，所以希望列宽可以支持拖拽改变。

What does the proposed API look like?

列宽可以支持拖拽改变

[deepthan]

也正好也需要这个，不知是否可以提供解决办法。

[CarterLi]

我们的方案

import { AfterViewInit, Directive, ElementRef, Input } from '@angular/core';

import './index.scss';

@Directive({
  selector: '[tableResizable]',
})
export class TableResizableDirective implements AfterViewInit {
  @Input('tableResizable') columnWidths: string[];
  @Input() usePixel = false;

  constructor(private $element: ElementRef<HTMLTableElement>) {}

  ngAfterViewInit() {
    const el = (() => {
      let result = this.$element.nativeElement;
      if (result.tagName === 'NZ-TABLE') {
        result = result.querySelector('table');
      }
      if (result.tagName !== 'TABLE') throw new TypeError('Must be a TABLE element');
      if (!result.tHead) throw new TypeError('Must have a THEAD element');
      return result;
    })();
    el.classList.add('table-resizable');
    const tr = el.tHead.rows[0];
    if (!tr) throw new TypeError('Must have at least one TR element inside THEAD element');

    setTimeout(() => {
      const ths = Array.from(tr.cells) as HTMLTableHeaderCellElement[];
      if (ths.length <= 1) return;
      --ths.length; // 最后一个方格总是自动列宽的（用于占满整行）

      if (!Array.isArray(this.columnWidths)) {
        this.columnWidths = new Array(ths.length).fill('');
      } else {
        this.columnWidths.length = ths.length;
        this.columnWidths.forEach((x, i, arr) => {
          if (!x) arr[i] = '';
        });
      }

      ths.forEach(th => {
        if (th.classList.contains('no-resize')) return;
        if (this.columnWidths[th.cellIndex]) {
          th.width = this.columnWidths[th.cellIndex];
        }

        const i = document.createElement('i');
        i.classList.add('resize-indicator');
        th.appendChild(i);

        i.addEventListener('mousedown', e => {
          if (e.button === 1) { // 鼠标中键
            th.width = '';
            return;
          }
          if (e.button !== 0) return;
          const startX = e.pageX;
          const startThWidth = th.clientWidth;
          document.body.classList.add('table-resizing');

          let mousemoveHandler;

          document.body.addEventListener('mousemove', mousemoveHandler = e => {
            if (e.button !== 0) return;
            const pixel = e.pageX - startX + startThWidth;
            if (this.usePixel) {
              th.width = pixel + '';
            } else {
              th.width = pixel / tr.offsetWidth * 100 + '%';
            }
            this.columnWidths[th.cellIndex] = th.width;
          });

          document.body.addEventListener('mouseup', e => {
            if (e.button !== 0) return;
            document.body.removeEventListener('mousemove', mousemoveHandler);
            document.body.classList.remove('table-resizing');
          }, { once: true });
        });
      });
    });
  }
}

// index.scss
.table-resizable th {
  position: relative;
}

body.table-resizing {
  cursor: col-resize !important;
  user-select: none;
}

.resize-indicator {
  display: block;
  position: absolute;
  top: 0;
  right: -5px;
  width: 9px;
  height: 100%;
  cursor: col-resize;
}

用法：

<nz-table
  [tableResizable]></nz-table>

效果：

[luver225]

@CarterLi 你好 ，这个Directive我放到我的nz-table没有反应，有什么注意事项吗？那两个input需要怎么设置？

[CarterLi]

先确定directive的代码有没有执行，i标签有没有生成，自己调试一下，代码总共也没几行
那两个input没有特殊需求不用设置

[luver225]

@CarterLi 谢谢回答，因为CSS没加载对，谢谢

[DeepnetSecurity]

I know the same feature was rejected in #946 (#946).

However, ant design now supports it (column resizable)
https://ant.design/components/table/#components-table-demo-resizable-column

@vthinkxie I wish NG-ZORRO can support it soon, although there is a workaround.

[chanchaw]

@CarterLi 你好 ，这个Directive我放到我的nz-table没有反应，有什么注意事项吗？那两个input需要怎么设置？

我试了也没反应，到console 中查看在 th内没有生成 。你是如何解决的？有必要的话：QQ = 409223171

[luver225]

@chanchaw 看看样式路径是否加载对

[chanchaw]

我的项目放到 stackblitz 上了：https://stackblitz.com/github/chanchaw/zorroFormLayout 你看左侧导航栏对的第三个：表格组件换行问题

…

------------------ 原始邮件 ------------------ 发件人: "luver225"<notifications@github.com>; 发送时间: 2019年7月16日(星期二) 下午4:02 收件人: "NG-ZORRO/ng-zorro-antd"<ng-zorro-antd@noreply.github.com>; 抄送: "葬天尘"<409223171@qq.com>; "Mention"<mention@noreply.github.com>; 主题: Re: [NG-ZORRO/ng-zorro-antd] Table支持拖拽改变列宽 (#2776) @chanchaw 看看样式路径是否加载对 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[chanchaw]

@chanchaw 看看样式路径是否加载对

我的项目放到 stackblitz 上了：https://stackblitz.com/github/chanchaw/zorroFormLayout
你看左侧导航栏对的第三个：表格组件换行问题

[CarterLi]

@chanchaw 看看样式路径是否加载对

我的项目放到 stackblitz 上了：stackblitz.com/github/chanchaw/zorroFormLayout
你看左侧导航栏对的第三个：表格组件换行问题

tableResizable 换 [tableResizable]，然后自己慢慢调吧

[chanchaw]

@chanchaw 看看样式路径是否加载对

我的项目放到 stackblitz 上了：stackblitz.com/github/chanchaw/zorroFormLayout
你看左侧导航栏对的第三个：表格组件换行问题

tableResizable 换 [tableResizable]，然后自己慢慢调吧

调整好了，没有报错，但是打开还是没有效果。能再帮忙看看么？我重新 commit 了，你 stackblitz 那个要重新打开了

[luver225]

@chanchaw 缺少在app.module.ts中import TableResizableDirective组件

[chanchaw]

@luver225 我在组件临近的 module 中 import 了，这做不行的？
我又试验了把临近的 module 中的 import 去掉，然后到 app.module.ts 中import
就报错 Error: Template parse errors:
Can't bind to 'tableResizable' since it isn't a known property of 'nz-table'.

[luver225]

调不出来...

[chanchaw]

@luver225 你能把你的成功项目放到 stackblitz 上么？

[wzhudev]

Ref: #3771.

@chanchaw @luver225 Please discuss in private for private problems.

[vthinkxie]

https://ng.ant.design/experimental/resizable/zh

[2hao]

版本9 的拖拽改进解决方案

import { AfterViewInit, Directive, ElementRef, Input, Renderer2, Output, EventEmitter, ChangeDetectorRef } from '@angular/core';
import { Subject, forkJoin, combineLatest } from 'rxjs';
import { NzTableComponent } from 'ng-zorro-antd';

@Directive({
  selector: '[appThWidthChanger2]',
})
export class ThWidthChanger2Directive implements AfterViewInit {
  private _widthConfig: number[] = [];
  nzTableEl: any;
  private get nzWidthConfig(): string[] {
    return [...this._widthConfig.map(u => u + 'px')];
  }
  @Input('appThWidthChanger2') set widthConfig(value: number[]) {
    this._widthConfig = value.map(u => u ? u : 136);
  }
  @Output() appThResizeComplete = new EventEmitter<number[]>();

  @Input() set appThDataInit(value: number) {
      console.log('table data init');
      if (value) {
        this.dataInitSubject.next(true);
      }
  }

// 自身业务要求，可以去掉。
  viewInitSubject = new Subject<boolean>();
  dataInitSubject = new Subject<boolean>();


  constructor(private $element: ElementRef<any>, private host: NzTableComponent, private cdr: ChangeDetectorRef) {
      this.nzTableEl = this.$element.nativeElement;
      combineLatest([this.viewInitSubject, this.dataInitSubject])
      .subscribe(data => {
        if (!this.nzWidthConfig || this.nzWidthConfig.length === 0) {
          throw new Error('必须有列宽数据');
        }
        if (this.nzTableEl.tagName !== 'NZ-TABLE') {
            throw new TypeError('必须绑定再nz-table元素上');
        }
        const thTableEl = this.nzTableEl.querySelector('.ant-table-header table');
        if (!thTableEl) {
            throw new Error('必须有头部Table元素');
        }
        thTableEl.classList.add('table-resizable');
        const tr = thTableEl.tHead.rows[0];
        if (!tr) {
            throw new TypeError('必须有列数据');
        }
        const ths = Array.from(tr.cells) as HTMLTableHeaderCellElement[];
        if (ths.length <= 1) {
            console.log(this.nzWidthConfig);
            return;
        }
        this.host.nzWidthConfig = this.nzWidthConfig;
        this.host.ngOnChanges({nzWidthConfig: {previousValue: null, currentValue: this.nzWidthConfig, isFirstChange: () => false, firstChange: false}});
        ths.forEach((th, index) => {
          if (th.classList.contains('no-resize')) {
            return 1;
          }
          const previousI = th.querySelector('i.resize-indicator');
          if (previousI) {
            th.removeChild(previousI);
          }
          const i = document.createElement('i');
          i.classList.add('resize-indicator');
          th.appendChild(i);

          i.addEventListener('mousedown', e => {
            const tempWidthConfig = [...this._widthConfig];
            if (e.button === 1) { // 鼠标中键
                return;
            }
            if (e.button !== 0) {return; }
            const startX = e.pageX;
            const startThWidth = th.clientWidth;
            console.log(this.nzWidthConfig);
            document.body.classList.add('table-resizing');
            let mousemoveHandler;
            document.body.addEventListener('mousemove', mousemoveHandler = e2 => {
                if (e2.button !== 0) { return; }
                const pixel = e2.pageX - startX + startThWidth;
                this._widthConfig[index - 1] = pixel;
                tempWidthConfig[index - 1] = pixel;
                this.host.nzWidthConfig = this.nzWidthConfig;
                this.host.ngOnChanges({nzWidthConfig: {previousValue: null, currentValue: this.nzWidthConfig, isFirstChange: () => false, firstChange: false}});
            });

            document.body.addEventListener('mouseup', e => {
                if (e.button !== 0) { return; }
                document.body.removeEventListener('mousemove', mousemoveHandler);
                document.body.classList.remove('table-resizing');
                this.appThResizeComplete.emit(tempWidthConfig);
            }, { once: true });
          });
        });
      });
  }

  ngAfterViewInit() {
      this.viewInitSubject.next(true);
  }
}

样式和上面的一样，但是在需要额外加一行<th></th>,如下:

<thead>
          <tr>
            <ng-container *ngFor="let th of thNames">
              <th></th>
            </ng-container>
            <th></th> <!--额外添加的一列-->
          </tr>
  </thead>