Block Delete Permission

[ziqiangai]

1. Describe a problem. I cannot prevent the ToolBar Tunnel button delete blocks, or the backspace key from deleting blocks.
2. Describe the solution you'd like. Mockups are welcome.

why not add if statement in:

https://github.com/codex-team/editor.js/blob/f7368edee3fd5af32a6a9e9903bb9a00a94cff68/src/components/block-tunes/block-tune-delete.ts#L90-L119

It will be:

public handleClick(event: MouseEvent): void {
    if (!this.api.blocks.canDelete()) {
      return;
    }
    
    /**
     * if block is not waiting the confirmation, subscribe on block-settings-closing event to reset
     * otherwise delete block
     */
    if (!this.needConfirmation) {
      this.setConfirmation(true);

      /**
       * Subscribe on event.
       * When toolbar block settings is closed but block deletion is not confirmed,
       * then reset confirmation state
       */
      this.api.events.on('block-settings-closed', this.resetConfirmation);
    } else {
      /**
       * Unsubscribe from block-settings closing event
       */
      this.api.events.off('block-settings-closed', this.resetConfirmation);

      this.api.blocks.delete();
      this.api.toolbar.close();
      this.api.tooltip.hide();

      /**
       * Prevent firing ui~documentClicked that can drop currentBlock pointer
       */
      event.stopPropagation();
    }
  }

3. Are there any alternatives? In some scenarios that require permission control, some blocks may not be deleted, or only the specified person is allowed to delete.

[ziqiangai]

It may affect the re deletion of Ctrl + AA （Select All）