command-manager/static/js/terminal/lib/resize.js

/**
 * Created by nuintun on 2015/11/25.
 */

'use strict';

module.exports = function (Terminal){
  /**
   * resize
   * @param x
   * @param y
   */
  Terminal.prototype.resize = function (x, y){
    var line, element, i, j, ch;

    if (x < 1) x = 1;

    if (y < 1) y = 1;

    // resize cols
    j = this.cols;

    if (j < x) {
      // does xterm use the default attr
      ch = [this.defAttr, ' '];
      i = this.lines.length;

      while (i--) {
        while (this.lines[i].length < x) {
          this.lines[i].push(ch);
        }
      }
    } else if (j > x) {
      i = this.lines.length;

      while (i--) {
        while (this.lines[i].length > x) {
          this.lines[i].pop();
        }
      }
    }

    this.setupStops(j);

    this.cols = x;

    // resize rows
    j = this.rows;

    if (j < y) {
      element = this.element;
      while (j++ < y) {
        if (this.lines.length < y + this.ybase) {
          this.lines.push(this.blankLine());
        }

        if (this.children.length < y) {
          line = this.document.createElement('div');

          element.appendChild(line);

          this.children.push(line);
        }
      }
    } else if (j > y) {
      while (j-- > y) {
        if (this.lines.length > y + this.ybase) {
          this.lines.pop();
        }

        if (this.children.length > y) {
          element = this.children.pop();

          if (!element) continue;

          element.parentNode.removeChild(element);
        }
      }
    }

    this.rows = y;

    // make sure the cursor stays on screen
    if (this.y >= y) this.y = y - 1;

    if (this.x >= x) this.x = x - 1;

    this.scrollTop = 0;
    this.scrollBottom = y - 1;

    this.refresh(0, this.rows - 1);

    // it's a real nightmare trying
    // to resize the original
    // screen buffer. just set it
    // to null for now.
    this.normal = null;
  };
};