gerrit/polygerrit-ui/app/elements/gr-change-list.html

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Copyright (C) 2015 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

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distributed under the License is distributed on an "AS IS" BASIS,
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<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="../styles/gr-change-list-styles.html">
<link rel="import" href="gr-change-list-item.html">

<dom-module id="gr-change-list">
  <template>
    <style>
      :host {
        display: flex;
        flex-direction: column;
      }
      .headerRow {
        display: flex;
      }
      .topHeader,
      .groupHeader {
        border-bottom: 1px solid #eee;
        font-weight: bold;
        padding: .3em .5em;
      }
      .topHeader {
        background-color: #ddd;
        flex-shrink: 0;
      }
    </style>
    <style include="gr-change-list-styles"></style>
    <div class="headerRow">
      <span class="topHeader keyboard"></span> <!-- keyboard position indicator -->
      <span class="topHeader star" hidden$="[[!showStar]]"></span>
      <span class="topHeader subject">Subject</span>
      <span class="topHeader status">Status</span>
      <span class="topHeader owner">Owner</span>
      <span class="topHeader project">Project</span>
      <span class="topHeader branch">Branch</span>
      <span class="topHeader updated">Updated</span>
      <span class="topHeader size">Size</span>
      <template is="dom-repeat" items="[[labelNames]]" as="labelName">
        <span class="topHeader label" title$="[[labelName]]">
          [[_computeLabelShortcut(labelName)]]
        </span>
      </template>
    </div>
    <template is="dom-repeat" items="{{groups}}" as="changeGroup" index-as="groupIndex">
      <template is="dom-if" if="[[_groupTitle(groupIndex)]]">
        <div class="groupHeader">[[_groupTitle(groupIndex)]]</div>
      </template>
      <template is="dom-repeat" items="[[changeGroup]]" as="change">
        <gr-change-list-item
            selected$="[[_computeItemSelected(index, groupIndex, selectedIndex)]]"
            change="[[change]]"
            show-star="[[showStar]]"
            label-names="[[labelNames]]"></gr-change-list-item>
      </template>
    </template>
  </template>

  <script>
  (function() {
    'use strict';

    Polymer({
      is: 'gr-change-list',

      hostAttributes: {
        tabindex: 0,
      },

      properties: {
        /**
         * An array of ChangeInfo objects to render.
         * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#change-info
         */
        changes: {
          type: Array,
          observer: '_changesChanged',
        },
        /**
         * ChangeInfo objects grouped into arrays. The groups and changes
         * properties should not be used together.
         */
        groups: {
          type: Array,
          value: function() { return []; },
        },
        groupTitles: {
          type: Array,
          value: function() { return []; },
        },
        labelNames: {
          type: Array,
          computed: '_computeLabelNames(groups)',
        },
        selectedIndex: {
          type: Number,
          notify: true,
        },
        showStar: {
          type: Boolean,
          value: false,
        },
        _boundKeyHandler: {
          type: Function,
          value: function() { return this._handleKey.bind(this); },
        }
      },

      attached: function() {
        document.body.addEventListener('keydown', this._boundKeyHandler);
      },

      detached: function() {
        document.body.removeEventListener('keydown', this._boundKeyHandler);
      },

      _computeLabelNames: function(groups) {
        var labels = [];
        var nonExistingLabel = function(item) {
          return labels.indexOf(item) < 0;
        };
        for (var i = 0; i < groups.length; i++) {
          var group = groups[i];
          for (var j = 0; j < group.length; j++) {
            var change = group[j];
            if (!change.labels) { continue; }
            var currentLabels = Object.keys(change.labels);
            labels = labels.concat(currentLabels.filter(nonExistingLabel));
          }
        }
        return labels.sort();
      },

      _computeLabelShortcut: function(labelName) {
        return labelName.replace(/[a-z-]/g, '');
      },

      _changesChanged: function(changes) {
        this.groups = [changes];
      },

      _groupTitle: function(groupIndex) {
        if (groupIndex > this.groupTitles.length - 1) { return null; }
        return this.groupTitles[groupIndex];
      },

      _computeItemSelected: function(index, groupIndex, selectedIndex) {
        var idx = 0;
        for (var i = 0; i < groupIndex; i++) {
          idx += this.groups[i].length;
        }
        idx += index;
        return idx == selectedIndex;
      },

      _handleKey: function(e) {
        if (util.shouldSupressKeyboardShortcut(e)) { return; }

        if (this.groups == null) { return; }
        var len = 0;
        this.groups.forEach(function(group) {
          len += group.length;
        });
        switch(e.keyCode) {
          case 74:  // 'j'
            e.preventDefault();
            if (this.selectedIndex == len - 1) { return; }
            this.selectedIndex += 1;
            break;
          case 75:  // 'k'
            e.preventDefault();
            if (this.selectedIndex == 0) { return; }
            this.selectedIndex -= 1;
            break;
          case 79:  // 'o'
          case 13:  // 'enter'
            e.preventDefault();
            page.show(this._changeURLForIndex(this.selectedIndex));
            break;
        }
      },

      _changeURLForIndex: function(index) {
        var changeEls = this._getListItems();
        if (index < changeEls.length && changeEls[index]) {
          return changeEls[index].changeURL;
        }
        return '';
      },

      _getListItems: function() {
        return Polymer.dom(this.root).querySelectorAll('gr-change-list-item');
      },

    });
  })();
  </script>
</dom-module>