Ticket/InsdepUI/plugin/cropper-2.3.4/src/js/handlers.js

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    resize: function () {
      var restore = this.options.restore;
      var $container = this.$container;
      var container = this.container;
      var canvasData;
      var cropBoxData;
      var ratio;

      // Check `container` is necessary for IE8
      if (this.isDisabled || !container) {
        return;
      }

      ratio = $container.width() / container.width;

      // Resize when width changed or height changed
      if (ratio !== 1 || $container.height() !== container.height) {
        if (restore) {
          canvasData = this.getCanvasData();
          cropBoxData = this.getCropBoxData();
        }

        this.render();

        if (restore) {
          this.setCanvasData($.each(canvasData, function (i, n) {
            canvasData[i] = n * ratio;
          }));
          this.setCropBoxData($.each(cropBoxData, function (i, n) {
            cropBoxData[i] = n * ratio;
          }));
        }
      }
    },

    dblclick: function () {
      if (this.isDisabled) {
        return;
      }

      if (this.$dragBox.hasClass(CLASS_CROP)) {
        this.setDragMode(ACTION_MOVE);
      } else {
        this.setDragMode(ACTION_CROP);
      }
    },

    wheel: function (event) {
      var e = event.originalEvent || event;
      var ratio = num(this.options.wheelZoomRatio) || 0.1;
      var delta = 1;

      if (this.isDisabled) {
        return;
      }

      event.preventDefault();

      // Limit wheel speed to prevent zoom too fast
      if (this.wheeling) {