grid programme

node_modules/flickity/test/unit/position-cells.js

@@ -0,0 +1,51 @@
+( function() {
+
+'use strict';
+
+// position values can be off by 0.1% or 1px
+function isPositionApprox( value, expected ) {
+  var isPercent = value.indexOf('%') != -1;
+  value = parseFloat( value );
+  var diff = Math.abs( expected - value );
+  return isPercent ? diff < 0.1 : diff <= 1;
+}
+
+// loop through cells and check position values against expecteds
+function checkCellPositions( flkty, expecteds ) {
+  var isOK;
+  for ( var i=0, len = expecteds.length; i < len; i++ ) {
+    var expected = expecteds[i];
+    var cell = flkty.cells[i];
+    var position = cell.element.style.left;
+    isOK = isPositionApprox( position, expected );
+    if ( !isOK ) {
+      console.error( 'wrong cell position, index: ' + i + '. ' +
+        'expected: ' + expected + '. position: ' + position );
+      break;
+    }
+  }
+  return isOK;
+}
+
+QUnit.test( 'position cells', function( assert ) {
+
+  var flkty = new Flickity('#position-cells');
+
+  assert.ok( checkCellPositions( flkty, [ 0, 40, 65, 125, 165, 225 ] ), 'percent cell position' );
+  // .cell { margin: 0 2%; }
+  flkty.element.classList.add('percent-margin');
+  flkty.positionCells();
+  assert.ok( checkCellPositions( flkty, [ 0, 44, 73, 137, 181, 245 ] ), 'percent cell position with margin' );
+  flkty.element.classList.remove('percent-margin');
+  // pixel-based position
+  flkty.options.percentPosition = false;
+  flkty.positionCells();
+  assert.ok( checkCellPositions( flkty, [ 0, 160, 260, 500, 660, 900 ] ), 'pixel cell position' );
+  // pixel margin, { margin: 0 10px; }
+  flkty.element.classList.add('pixel-margin');
+  flkty.positionCells();
+  assert.ok( checkCellPositions( flkty, [ 0, 180, 300, 560, 740, 1000 ] ), 'pixel cell position with margin' );
+
+});
+
+})();