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Angular CDK Drag & Drop: Don't move source item

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I am trying to implement an editor where one can drag an item to add it to the main content, the problem is that the source item is always destroyed when I'm dragging out of the source item container.

Is there a way to force the source item to stay where it is while it's still possible to drag and drop the item? Basically, I want a copy-behaviour of that instead of a move-behaviour.

I've already seen other questions that correspond to what I want to achieve basically, but none of them really helped me as the questions were more about how to get it technically done to copy an item while I want to know how I implement this behaviour in the UI as its very confusing to see if the item just disappears.

like image 665
Yassine Zeriouh Avatar asked May 13 '19 13:05

Yassine Zeriouh


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3 Answers

replace

drop(event: CdkDragDrop<string[]>) {
  if (event.previousContainer === event.container) {
    moveItemInArray(event.container.data, event.previousIndex, event.currentIndex);
  } else {
    transferArrayItem(
      event.previousContainer.data,
      event.container.data,
      event.previousIndex,
      event.currentIndex
    );
  }
}

with

drop(event: any) {
  if (event.previousContainer === event.container) {
    moveItemInArray(event.container.data, event.previousIndex, event.currentIndex);
  } else {
    copyArrayItem(
      event.previousContainer.data,
      event.container.data,
      event.previousIndex,
      event.currentIndex
    );
  }
}
like image 83
arpit tayal Avatar answered Sep 28 '22 05:09

arpit tayal


Import import {copyArrayItem} from '@angular/cdk/drag-drop';

AND

Replace transferArrayItem with copyArrayItem

like image 24
TRIKONINFOSYSTEMS Avatar answered Sep 28 '22 06:09

TRIKONINFOSYSTEMS


All solutions above are great however there is one problem cloning happens after element is dropped so I went through git conversion and found the solution below

STYLES

.drag-container {
    width: 400px;
    max-width: 100%;
    margin: 0 25px 25px 0;
    display: inline-block;
    vertical-align: top;
}

.drag-list {
    border: solid 1px #ccc;
    min-height: 60px;
    background: white;
    border-radius: 4px;
    overflow: hidden;
    display: block;
}

.drag-box {
    padding: 20px 10px;
    border-bottom: solid 1px #ccc;
    color: rgba(0, 0, 0, 0.87);
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
    cursor: move;
    background: white;
    font-size: 14px;
}

.cdk-drag-preview {
    box-sizing: border-box;
    border-radius: 4px;
    box-shadow: 0 5px 5px -3px rgba(0, 0, 0, 0.2),
        0 8px 10px 1px rgba(0, 0, 0, 0.14),
        0 3px 14px 2px rgba(0, 0, 0, 0.12);
}

.cdk-drag-placeholder {
    opacity: 0;
}

.cdk-drag-animating {
    transition: transform 250ms cubic-bezier(0, 0, 0.2, 1);
}

.drag-box:last-child {
    border: none;
}

.drag-list.cdk-drop-list-dragging .drag-box:not(.cdk-drag-placeholder) {
    transition: transform 250ms cubic-bezier(0, 0, 0.2, 1);
}

TYPESCRIPT

menu: any = [
    { title: 'pork', price: 12, id: 1 },
    { title: 'duck', price: 12, id: 2 },
    { title: 'chicken', price: 12, id: 3 },
    { title: 'beef', price: 12, id: 4 },
    { title: 'soup', price: 12, id: 5 },
  ];

  table: any = [];



  drop(event: any) {
    if (event.previousContainer !== event.container) {
      copyArrayItem(
        event.previousContainer.data,
        event.container.data,
        event.previousIndex,
        event.currentIndex
      );
    } else {
      moveItemInArray(
        event.container.data,
        event.previousIndex,
        event.currentIndex
      );
    }
    if (event.previousContainer.data) {
      this.menu = this.menu.filter((f: any) => !f.temp);
    }
  }



  exited(event: any) {
    const currentIdx = event.container.data.findIndex(
      (f: any) => f.id === event.item.data.id
    );
    this.menu.splice(currentIdx + 1, 0, {
      ...event.item.data,
      temp: true,
    });
  }
  entered() {
    this.menu = this.menu.filter((f: any) => !f.temp);
  }

HTML

<div cdkDropListGroup>
            <div class="drag-container">
                <h2>To do</h2>
                <div class="drag-list" cdkDropList #menuList="cdkDropList" [cdkDropListData]="menu" cdkDropListSortingDisabled [cdkDropListConnectedTo]="[tableList]" (cdkDropListDropped)="drop($event)" (cdkDropListExited)="exited($event)" (cdkDropListEntered)="entered()">
                    <div class="drag-box" *ngFor="let item of menu" cdkDrag [cdkDragData]="item">{{item.title}}</div>
                </div>
            </div>
            <div class="drag-container">
                <h2>Done</h2>
                <div class="drag-list" cdkDropList #tableList="cdkDropList" [cdkDropListData]="table" (cdkDropListDropped)="drop($event)">
                    <div class="drag-box" *ngFor="let item of table; let idx = index" cdkDrag>{{item.title}}</div>
                </div>
            </div>
</div>

Source 1 : stackblitz

Source 2 : github

like image 42
Vikas Kandari Avatar answered Sep 28 '22 06:09

Vikas Kandari