TypeScript ArrayExt.findFirstIndex方法代碼示例

      it('should remove a group from the menu', () => {
        const group1 = [ { command: 'run1'}, { command: 'run2' }];
        const group2 = [ { command: 'run3'}, { command: 'run4' }];
        menu.addGroup(group1);
        menu.addGroup(group2);
        menu.removeGroup(group1);

        let idx1 = ArrayExt.findFirstIndex(menu.menu.items,
                                           m => m.command === 'run1');
        let idx2 = ArrayExt.findFirstIndex(menu.menu.items,
                                           m => m.command === 'run2');
        let idx3 = ArrayExt.findFirstIndex(menu.menu.items,
                                           m => m.command === 'run3');
        let idx4 = ArrayExt.findFirstIndex(menu.menu.items,
                                           m => m.command === 'run4');

        expect(idx1).to.be(-1);
        expect(idx2).to.be(-1);
        expect(idx3 === -1).to.be(false);
        expect(idx4 === -1).to.be(false);
      });

 /**
  * Handle the `'p-dragenter'` event for the widget.
  */
 private _evtDragEnter(event: IDragEvent): void {
   if (event.mimeData.hasData(CONTENTS_MIME)) {
     let index = ArrayExt.findFirstIndex(this._crumbs, node => ElementExt.hitTest(node, event.clientX, event.clientY));
     if (index !== -1) {
       if (index !== Private.Crumb.Current) {
         this._crumbs[index].classList.add(DROP_TARGET_CLASS);
         event.preventDefault();
         event.stopPropagation();
       }
     }
   }
 }

 /**
  * Handle the `'p-dragover'` event for the widget.
  */
 private _evtDragOver(event: IDragEvent): void {
   event.preventDefault();
   event.stopPropagation();
   event.dropAction = event.proposedAction;
   let dropTarget = DOMUtils.findElement(this.node, DROP_TARGET_CLASS);
   if (dropTarget) {
     dropTarget.classList.remove(DROP_TARGET_CLASS);
   }
   let index = ArrayExt.findFirstIndex(this._crumbs, node => ElementExt.hitTest(node, event.clientX, event.clientY));
   if (index !== -1) {
     this._crumbs[index].classList.add(DROP_TARGET_CLASS);
   }
 }

      it('should take a rank as an option', () => {
        menu.addGroup([{ command: 'run1' }, { command: 'run2' }], 2);
        menu.addGroup([{ command: 'run3' }, { command: 'run4' }], 1);

        const idx1 = ArrayExt.findFirstIndex(
          menu.menu.items,
          m => m.command === 'run1'
        );
        const idx2 = ArrayExt.findFirstIndex(
          menu.menu.items,
          m => m.command === 'run2'
        );
        const idx3 = ArrayExt.findFirstIndex(
          menu.menu.items,
          m => m.command === 'run3'
        );
        const idx4 = ArrayExt.findFirstIndex(
          menu.menu.items,
          m => m.command === 'run4'
        );
        expect(idx3 < idx4).to.equal(true);
        expect(idx4 < idx1).to.equal(true);
        expect(idx1 < idx2).to.equal(true);
      });

  /**
   * Handle the `'p-drop'` event for the widget.
   */
  private _evtDrop(event: IDragEvent): void {
    event.preventDefault();
    event.stopPropagation();
    if (event.proposedAction === 'none') {
      event.dropAction = 'none';
      return;
    }
    if (!event.mimeData.hasData(CONTENTS_MIME)) {
      return;
    }
    event.dropAction = event.proposedAction;

    let target = event.target as HTMLElement;
    while (target && target.parentElement) {
      if (target.classList.contains(DROP_TARGET_CLASS)) {
        target.classList.remove(DROP_TARGET_CLASS);
        break;
      }
      target = target.parentElement;
    }

    // Get the path based on the target node.
    let index = ArrayExt.findFirstIndex(this._crumbs, node => node === target);
    if (index === -1) {
      return;
    }

    const model = this._model;
    const path = PathExt.resolve(model.path, BREAD_CRUMB_PATHS[index]);
    const manager = model.manager;

    // Move all of the items.
    let promises: Promise<any>[] = [];
    let oldPaths = event.mimeData.getData(CONTENTS_MIME) as string[];
    for (let oldPath of oldPaths) {
      let localOldPath = manager.services.contents.localPath(oldPath);
      let name = PathExt.basename(localOldPath);
      let newPath = PathExt.join(path, name);
      promises.push(renameFile(manager, oldPath, newPath));
    }
    Promise.all(promises).catch(err => {
      showErrorMessage('Move Error', err);
    });
  }

  /**
   * Handle the `'click'` event for the widget.
   */
  private _evtClick(event: MouseEvent): void {
    // Do nothing if it's not a left mouse press.
    if (event.button !== 0) {
      return;
    }

    // Find a valid click target.
    let node = event.target as HTMLElement;
    while (node && node !== this.node) {
      if (node.classList.contains(BREADCRUMB_ITEM_CLASS)) {
        let index = ArrayExt.findFirstIndex(this._crumbs, value => value === node);
        this._model.cd(BREAD_CRUMB_PATHS[index]).catch(error =>
          utils.showErrorMessage('Open Error', error)
        );

        // Stop the event propagation.
        event.preventDefault();
        event.stopPropagation();
        return;
      }
      node = node.parentElement as HTMLElement;
    }
  }

 it('should wrap around if stop < start', () => {
   let data = [1, 2, 3, 4, 5];
   let i = ArrayExt.findFirstIndex(data, v => v % 2 === 0, 4, 2);
   expect(i).to.equal(1);
 });