widget-csr.js

var blessed = require('../')
  , screen;

screen = blessed.screen({
  dump: __dirname + '/logs/csr.log',
  smartCSR: true,
  warnings: true
});

var lorem = require('fs').readFileSync(__dirname + '/git.diff', 'utf8');

var cleanSides = screen.cleanSides;
function expectClean(value) {
  screen.cleanSides = function(el) {
    var ret = cleanSides.apply(this, arguments);
    if (ret !== value) {
      throw new Error('Failed. Expected '
        + value + ' from cleanSides. Got '
        + ret + '.');
    }
    return ret;
  };
}

/*
blessed.box({
  parent: screen,
  left: 0,
  top: 'center',
  width: '50%',
  height: 2,
  style: {
    bg: 'green'
  },
  content: 'This will disallow CSR.'
});
expectClean(false);
*/

var btext = blessed.box({
  parent: screen,
  left: 'center',
  top: 'center',
  width: '80%',
  height: '80%',
  style: {
    bg: 'green'
  },
  border: 'line',
  content: 'CSR should still work.'
});
btext._oscroll = btext.scroll;
btext.scroll = function(offset, always) {
  expectClean(true);
  return btext._oscroll(offset, always);
};

var text = blessed.scrollabletext({
  parent: screen,
  content: lorem,
  border: 'line',
  left: 'center',
  top: 'center',
  draggable: true,
  width: '50%',
  height: '50%',
  mouse: true,
  keys: true,
  vi: true
});

text._oscroll = text.scroll;
text.scroll = function(offset, always) {
  var el = this;
  var value = true;
  if (el.left < 0) value = true;
  if (el.top < 0) value = false;
  if (el.left + el.width > screen.width) value = true;
  if (el.top + el.height > screen.height) value = false;
  expectClean(value);
  return text._oscroll(offset, always);
};

text.focus();

screen.key('q', function() {
  return screen.destroy();
});

screen.render();