[Local NTP] Adding NtpDesign class to parametrizing NTP design specs

This refactoring CL makes it easier to change NTP designs. The key
variable to control this switch is configData.ntpDesignName, which was
added in
https://chromiumcodereview.appspot.com/447033002/

We also added titleTextAlign and titleTextFade properties. The support
for these fields in Most Visited <iframes> were are added in
https://chromiumcodereview.appspot.com/448793003/

BUG=400346
TBR=jhawkins

Review URL: https://codereview.chromium.org/447243003

Cr-Commit-Position: refs/heads/master@{#288269}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288269 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 125 insertions, 69 deletions

diff --git a/chrome/browser/browser_resources.grd b/chrome/browser/browser_resources.grd
index 540d069..3d40483 100644
--- a/chrome/browser/browser_resources.grd
+++ b/chrome/browser/browser_resources.grd
@@ -206,6 +206,7 @@
       <include name="IDR_LOCAL_NTP_CSS" file="resources\local_ntp\local_ntp.css" type="BINDATA" />
       <include name="IDR_LOCAL_NTP_JS" file="resources\local_ntp\local_ntp.js" flattenhtml="true" type="BINDATA" />
       <include name="IDR_LOCAL_NTP_UTIL_JS" file="resources\local_ntp\local_ntp_util.js" flattenhtml="true" type="BINDATA" />
+      <include name="IDR_LOCAL_NTP_DESIGN_JS" file="resources\local_ntp\local_ntp_design.js" flattenhtml="true" type="BINDATA" />
       <include name="IDR_MOST_VISITED_IFRAME_CSS" file="resources\local_ntp\most_visited_iframe.css" type="BINDATA" />
       <include name="IDR_MOST_VISITED_TITLE_HTML" file="resources\local_ntp\most_visited_title.html" type="BINDATA" />
       <include name="IDR_MOST_VISITED_TITLE_CSS" file="resources\local_ntp\most_visited_title.css" type="BINDATA" />
diff --git a/chrome/browser/resources/local_ntp/local_ntp.js b/chrome/browser/resources/local_ntp/local_ntp.js
index d775540..9aaa9a8 100644
--- a/chrome/browser/resources/local_ntp/local_ntp.js
+++ b/chrome/browser/resources/local_ntp/local_ntp.js
@@ -14,6 +14,7 @@
  */
 function LocalNTP() {
 <include src="../../../../ui/webui/resources/js/assert.js">
+<include src="local_ntp_design.js">
 <include src="local_ntp_util.js">
 <include src="window_disposition_util.js">
 
@@ -102,6 +103,13 @@ var MIDDLE_MOUSE_BUTTON = 1;
 
 
 /**
+ * Specifications for the NTP design.
+ * @const {NtpDesign}
+ */
+var NTP_DESIGN = getNtpDesign(configData.ntpDesignName);
+
+
+/**
  * The container for the tile elements.
  * @type {Element}
  */
@@ -204,22 +212,6 @@ var omniboxInputBehavior = NTP_DISPOSE_STATE.NONE;
 var fakeboxInputBehavior = NTP_DISPOSE_STATE.HIDE_FAKEBOX_AND_LOGO;
 
 
-/**
- * Total tile width. Should be equal to mv-tile's width + 2 * border-width.
- * @private {number}
- * @const
- */
-var TILE_WIDTH = 140;
-
-
-/**
- * Margin between tiles. Should be equal to mv-tile's total horizontal margin.
- * @private {number}
- * @const
- */
-var TILE_MARGIN = 20;
-
-
 /** @type {number} @const */
 var MAX_NUM_TILES_TO_SHOW = 8;
 
@@ -262,30 +254,6 @@ var MOST_VISITED_THUMBNAIL_IFRAME = 'thumbnail.html';
 
 
 /**
- * The hex color for most visited tile elements.
- * @type {string}
- * @const
- */
-var MOST_VISITED_COLOR = '777777';
-
-
-/**
- * The font family for most visited tile elements.
- * @type {string}
- * @const
- */
-var MOST_VISITED_FONT_FAMILY = 'arial, sans-serif';
-
-
-/**
- * The font size for most visited tile elements.
- * @type {number}
- * @const
- */
-var MOST_VISITED_FONT_SIZE = 11;
-
-
-/**
  * Hide most visited tiles for at most this many milliseconds while painting.
  * @type {number}
  * @const
@@ -370,7 +338,7 @@ function setCustomThemeStyle(opt_themeInfo) {
       '}' +
       '.mv-page-ready {' +
       '  border: 1px solid ' +
-        convertToRGBAColor(opt_themeInfo.sectionBorderColorRgba) + ';' +
+          convertToRGBAColor(opt_themeInfo.sectionBorderColorRgba) + ';' +
       '}' +
       '.mv-page-ready:hover, .mv-page-ready:focus {' +
       '  border-color: ' +
@@ -560,23 +528,44 @@ function renderAndShowTiles() {
 
 
 /**
- * Builds a URL to display a most visited tile component in an iframe.
- * @param {string} filename The desired most visited component filename.
+ * Builds a URL to display a most visited tile title in an iframe.
  * @param {number} rid The restricted ID.
- * @param {string} color The text color for text in the iframe.
- * @param {string} fontFamily The font family for text in the iframe.
- * @param {number} fontSize The font size for text in the iframe.
  * @param {number} position The position of the iframe in the UI.
- * @return {string} An URL to display the most visited component in an iframe.
- */
-function getMostVisitedIframeUrl(filename, rid, color, fontFamily, fontSize,
-    position) {
-  return 'chrome-search://most-visited/' + encodeURIComponent(filename) + '?' +
-      ['rid=' + encodeURIComponent(rid),
-       'c=' + encodeURIComponent(color),
-       'f=' + encodeURIComponent(fontFamily),
-       'fs=' + encodeURIComponent(fontSize),
-       'pos=' + encodeURIComponent(position)].join('&');
+ * @return {string} An URL to display the most visited title in an iframe.
+ */
+function getMostVisitedTitleIframeUrl(rid, position) {
+  var url = 'chrome-search://most-visited/' +
+      encodeURIComponent(MOST_VISITED_TITLE_IFRAME);
+  var params = [
+      'rid=' + encodeURIComponent(rid),
+      'f=' + encodeURIComponent(NTP_DESIGN.fontFamily),
+      'fs=' + encodeURIComponent(NTP_DESIGN.fontSize),
+      'c=' + encodeURIComponent(NTP_DESIGN.titleColor),
+      'pos=' + encodeURIComponent(position)];
+  if (NTP_DESIGN.titleTextAlign)
+    params.push('ta=' + encodeURIComponent(NTP_DESIGN.titleTextAlign));
+  if (NTP_DESIGN.titleTextFade)
+    params.push('tf=' + encodeURIComponent(NTP_DESIGN.titleTextFade));
+  return url + '?' + params.join('&');
+}
+
+
+/**
+ * Builds a URL to display a most visited tile thumbnail in an iframe.
+ * @param {number} rid The restricted ID.
+ * @param {number} position The position of the iframe in the UI.
+ * @return {string} An URL to display the most visited thumbnail in an iframe.
+ */
+function getMostVisitedThumbnailIframeUrl(rid, position) {
+  var url = 'chrome-search://most-visited/' +
+      encodeURIComponent(MOST_VISITED_THUMBNAIL_IFRAME);
+  var params = [
+      'rid=' + encodeURIComponent(rid),
+      'f=' + encodeURIComponent(NTP_DESIGN.fontFamily),
+      'fs=' + encodeURIComponent(NTP_DESIGN.fontSize),
+      'c=' + encodeURIComponent(NTP_DESIGN.thumbnailTextColor),
+      'pos=' + encodeURIComponent(position)];
+  return url + '?' + params.join('&');
 }
 
 
@@ -629,9 +618,7 @@ function createTile(page, position) {
     titleElement.id = 'title-' + rid;
     titleElement.className = CLASSES.TITLE;
     titleElement.hidden = true;
-    titleElement.src = getMostVisitedIframeUrl(
-        MOST_VISITED_TITLE_IFRAME, rid, MOST_VISITED_COLOR,
-        MOST_VISITED_FONT_FAMILY, MOST_VISITED_FONT_SIZE, position);
+    titleElement.src = getMostVisitedTitleIframeUrl(rid, position);
     tileElement.appendChild(titleElement);
 
     // The iframe which renders either a thumbnail or domain element.
@@ -641,9 +628,7 @@ function createTile(page, position) {
     thumbnailElement.id = 'thumb-' + rid;
     thumbnailElement.className = CLASSES.THUMBNAIL;
     thumbnailElement.hidden = true;
-    thumbnailElement.src = getMostVisitedIframeUrl(
-        MOST_VISITED_THUMBNAIL_IFRAME, rid, MOST_VISITED_COLOR,
-        MOST_VISITED_FONT_FAMILY, MOST_VISITED_FONT_SIZE, position);
+    thumbnailElement.src = getMostVisitedThumbnailIframeUrl(rid, position);
     tileElement.appendChild(thumbnailElement);
 
     // A mask to darken the thumbnail on focus.
@@ -743,11 +728,14 @@ function onRestoreAll() {
  * new width of the page.
  */
 function onResize() {
+  var tileRequiredWidth = NTP_DESIGN.tileWidth + NTP_DESIGN.tileMargin;
   // If innerWidth is zero, then use the maximum snap size.
-  var innerWidth = window.innerWidth || 820;
-  // Each tile has left and right margins that sum to TILE_MARGIN.
-  var tileRequiredWidth = TILE_WIDTH + TILE_MARGIN;
-  var availableWidth = innerWidth + TILE_MARGIN - MIN_TOTAL_HORIZONTAL_PADDING;
+  var maxSnapSize = MAX_NUM_COLUMNS * tileRequiredWidth -
+      NTP_DESIGN.tileMargin + MIN_TOTAL_HORIZONTAL_PADDING;
+  var innerWidth = window.innerWidth || maxSnapSize;
+  // Each tile has left and right margins that sum to NTP_DESIGN.tileMargin.
+  var availableWidth = innerWidth + NTP_DESIGN.tileMargin -
+      MIN_TOTAL_HORIZONTAL_PADDING;
   var newNumColumns = Math.floor(availableWidth / tileRequiredWidth);
   if (newNumColumns < MIN_NUM_COLUMNS)
     newNumColumns = MIN_NUM_COLUMNS;
@@ -758,8 +746,11 @@ function onResize() {
     numColumnsShown = newNumColumns;
     var tilesContainerWidth = numColumnsShown * tileRequiredWidth;
     tilesContainer.style.width = tilesContainerWidth + 'px';
-    if (fakebox)  // -2 to account for border.
-      fakebox.style.width = (tilesContainerWidth - TILE_MARGIN - 2) + 'px';
+    if (fakebox) {
+      // -2 to account for border.
+      fakebox.style.width =
+          (tilesContainerWidth - NTP_DESIGN.tileMargin - 2) + 'px';
+    }
     // Render without clearing tiles.
     renderAndShowTiles();
   }
@@ -959,15 +950,18 @@ function init() {
   var notificationMessage = $(IDS.NOTIFICATION_MESSAGE);
   notificationMessage.textContent =
       configData.translatedStrings.thumbnailRemovedNotification;
+
   var undoLink = $(IDS.UNDO_LINK);
   undoLink.addEventListener('click', onUndo);
   registerKeyHandler(undoLink, KEYCODE.ENTER, onUndo);
   undoLink.textContent = configData.translatedStrings.undoThumbnailRemove;
+
   var restoreAllLink = $(IDS.RESTORE_ALL_LINK);
   restoreAllLink.addEventListener('click', onRestoreAll);
   registerKeyHandler(restoreAllLink, KEYCODE.ENTER, onUndo);
   restoreAllLink.textContent =
       configData.translatedStrings.restoreThumbnailsShort;
+
   $(IDS.ATTRIBUTION_TEXT).textContent =
       configData.translatedStrings.attributionIntro;
 
@@ -1032,6 +1026,7 @@ function init() {
 
   if (searchboxApiHandle.rtl) {
     $(IDS.NOTIFICATION).dir = 'rtl';
+    document.body.setAttribute('dir', 'rtl');
     // Add class for setting alignments based on language directionality.
     document.body.classList.add(CLASSES.RTL);
     $(IDS.TILES).dir = 'rtl';
diff --git a/chrome/browser/resources/local_ntp/local_ntp_design.js b/chrome/browser/resources/local_ntp/local_ntp_design.js
new file mode 100644
index 0000000..59ed11f
--- /dev/null
+++ b/chrome/browser/resources/local_ntp/local_ntp_design.js
@@ -0,0 +1,61 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileoverview Specifications for the NTP design, and an accessor to presets.
+ */
+
+
+/**
+ * Specifications for an NTP design (not comprehensive).
+ *
+ * name: A unique identifier for the style.
+ *   appropriate CSS will take effect.
+ * fontFamily: Font family to use for title and thumbnail <iframe>s.
+ * fontSize: Font size to use for the <iframe>s, in px.
+ * tileWidth: The width of each suggestion tile, in px.
+ * tileMargin: Spacing between successive tiles, in px.
+ * titleColor: The RRGGBB color of title text.
+ * titleTextAlign: (Optional) The alignment of title text. If unspecified, the
+ *   default value is 'center'.
+ * titleTextFade: (Optional) The number of pixels beyond which title
+ *   text begins to fade. This overrides the default ellipsis style.
+ * thumbnailTextColor: The RRGGBB color that thumbnail <iframe> may use to
+ *   display text message in place of missing thumbnail.
+ *
+ * @typedef {{
+ *   name: string,
+ *   fontFamily: string,
+ *   fontSize: number,
+ *   tileWidth: number,
+ *   tileMargin: number,
+ *   titleColor: string,
+ *   titleTextAlign: string|null|undefined,
+ *   titleTextFade: string|null|undefined,
+ *   thumbnailTextColor: string
+ * }}
+ */
+var NtpDesign;
+
+/**
+ * Returns an NTP design corresponding to the given name.
+ * @param {string|undefined} opt_name The name of the design. If undefined, then
+ *   the default design is specified.
+ * @return {NtpDesign} The NTP design corresponding to name.
+ */
+function getNtpDesign(opt_name) {
+  // TODO(huangs): Add new style.
+  return {
+    name: 'classical',
+    fontFamily: 'arial, sans-serif',
+    fontSize: 11,
+    tileWidth: 140,
+    tileMargin: 20,
+    titleColor: '777777',
+    // No titleTextAlign: defaults to 'center'.
+    // No titleTextFade: by default we have ellipsis.
+    thumbnailTextColor: '777777'
+  };
+}
diff --git a/chrome/browser/search/local_ntp_source.cc b/chrome/browser/search/local_ntp_source.cc
index f9fefbe..a669e29 100644
--- a/chrome/browser/search/local_ntp_source.cc
+++ b/chrome/browser/search/local_ntp_source.cc
@@ -51,7 +51,6 @@ const struct Resource{
 } kResources[] = {
   { kLocalNTPFilename, IDR_LOCAL_NTP_HTML, "text/html" },
   { "local-ntp.js", IDR_LOCAL_NTP_JS, "application/javascript" },
-  { "local-ntp-util.js", IDR_LOCAL_NTP_UTIL_JS, "application/javascript" },
   { kConfigDataFilename, kLocalResource, "application/javascript" },
   { "local-ntp.css", IDR_LOCAL_NTP_CSS, "text/css" },
   { "images/close_2.png", IDR_CLOSE_2, "image/png" },