ionic-framework/js/angular/directive/headerFooterBar.js

IonicModule
.directive('ionNavBar', tapScrollToTopDirective())
.directive('ionHeaderBar', tapScrollToTopDirective())

/**
 * @ngdoc directive
 * @name ionHeaderBar
 * @module ionic
 * @restrict E
 *
 * @description
 * Adds a fixed header bar above some content.
 *
 * Can also be a subheader (lower down) if the 'bar-subheader' class is applied.
 * See [the header CSS docs](/docs/components/#subheader).
 *
 * @param {string=} align-title Where to align the title.
 * Avaialble: 'left', 'right', or 'center'.  Defaults to 'center'.
 *
 * @usage
 * ```html
 * <ion-header-bar align-title="left" class="bar-positive">
 *   <div class="buttons">
 *     <button class="button" ng-click="doSomething()">Left Button</button>
 *   </div>
 *   <h1 class="title">Title!</h1>
 *   <div class="buttons">
 *     <button class="button">Right Button</button>
 *   </div>
 * </ion-header-bar>
 * <ion-content>
 *   Some content!
 * </ion-content>
 * ```
 */
.directive('ionHeaderBar', headerFooterBarDirective(true))

/**
 * @ngdoc directive
 * @name ionFooterBar
 * @module ionic
 * @restrict E
 *
 * @description
 * Adds a fixed footer bar below some content.
 *
 * Can also be a subfooter (higher up) if the 'bar-subfooter' class is applied.
 * See [the footer CSS docs](/docs/components/#footer).
 *
 * @param {string=} align-title Where to align the title.
 * Avaialble: 'left', 'right', or 'center'.  Defaults to 'center'.
 *
 * @usage
 * ```html
 * <ion-content>
 *   Some content!
 * </ion-content>
 * <ion-footer-bar align-title="left" class="bar-assertive">
 *   <div class="buttons">
 *     <button class="button">Left Button</button>
 *   </div>
 *   <h1 class="title">Title!</h1>
 *   <div class="buttons" ng-click="doSomething()">
 *     <button class="button">Right Button</button>
 *   </div>
 * </ion-footer-bar>
 * ```
 */
.directive('ionFooterBar', headerFooterBarDirective(false));

function tapScrollToTopDirective() {
  return ['$ionicScrollDelegate', function($ionicScrollDelegate) {
    return {
      restrict: 'E',
      link: function($scope, $element, $attr) {
        ionic.on('tap', onTap, $element[0]);
        $scope.$on('$destroy', function() {
          ionic.off('tap', onTap, $element[0]);
        });

        function onTap(e) {
          var depth = 3;
          var current = e.target;
          //Don't scroll to top in certain cases
          while (depth-- && current) {
            if (current.classList.contains('button') ||
                current.tagName.match(/input|textarea|select/i) ||
                current.isContentEditable) {
              return;
            } 
            current = current.parentNode;
          }
          var touch = e.gesture && e.gesture.touches[0] || e.detail.touches[0];
          var bounds = $element[0].getBoundingClientRect();
          if (ionic.DomUtil.rectContains(
            touch.pageX, touch.pageY,
            bounds.left, bounds.top - 20,
            bounds.left + bounds.width, bounds.top + bounds.height
          )) {
            $ionicScrollDelegate.scrollTop(true);
          }
        }
      }
    };
  }];
}

function headerFooterBarDirective(isHeader) {
  return [function() {
    return {
      restrict: 'E',
      compile: function($element, $attr) {
        $element.addClass(isHeader ? 'bar bar-header' : 'bar bar-footer');

        return { pre: prelink };
        function prelink($scope, $element, $attr) {
          var hb = new ionic.views.HeaderBar({
            el: $element[0],
            alignTitle: $attr.alignTitle || 'center'
          });

          var el = $element[0];
          //just incase header is on rootscope
          var parentScope = $scope.$parent || $scope;

          if (isHeader) {
            $scope.$watch(function() { return el.className; }, function(value) {
              var isSubheader = value.indexOf('bar-subheader') !== -1;
              parentScope.$hasHeader = !isSubheader;
              parentScope.$hasSubheader = isSubheader;
            });
            $scope.$on('$destroy', function() {
              parentScope.$hasHeader = parentScope.$hasSubheader = null;
            });
          } else {
            $scope.$watch(function() { return el.className; }, function(value) {
              var isSubfooter = value.indexOf('bar-subfooter') !== -1;
              parentScope.$hasFooter = !isSubfooter;
              parentScope.$hasSubfooter = isSubfooter;
            });
            $scope.$on('$destroy', function() {
              parentScope.$hasFooter = parentScope.$hasSubfooter = null;
            });
            $scope.$watch('$hasTabs', function(val) {
              $element.toggleClass('has-tabs', !!val);
            });
          }
        }
      }
    };
  }];
}