1 files changed, 121 insertions, 0 deletions
diff --git a/chrome/browser/resources/print_preview/margin_settings.js b/chrome/browser/resources/print_preview/margin_settings.js
new file mode 100644
index 0000000..f9d81a3
--- /dev/null
+++ b/chrome/browser/resources/print_preview/margin_settings.js
@@ -0,0 +1,121 @@
+// Copyright (c) 2011 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.
+
+cr.define('print_preview', function() {
+  'use strict';
+
+  /**
+   * Creates a MarginSettings object. This object encapsulates all settings and
+   * logic related to the margins mode.
+   * @constructor
+   */
+  function MarginSettings() {
+    this.marginsOption_ = $('margins-option');
+    this.marginList_ = $('margin-list');
+    // Holds the custom left margin value (if set).
+    this.customMarginLeft_ = -1;
+    // Holds the custom right margin value (if set).
+    this.customMarginRight_ = -1;
+    // Holds the custom top margin value (if set).
+    this.customMarginTop_ = -1;
+    // Holds the custom bottom margin value (if set).
+    this.customMarginBottom_ = -1;
+    // Margin list values.
+    this.customMarginsValue_ = 2;
+    this.defaultMarginsValue_ = 0;
+    this.noMarginsValue_ = 1;
+    // Default Margins option index.
+    this.defaultMarginsIndex_ = 0;
+  }
+
+  cr.addSingletonGetter(MarginSettings);
+
+  MarginSettings.prototype = {
+    /**
+     * The selection list corresponding to the margins option.
+     * @return {HTMLInputElement}
+     */
+    get marginList() {
+      return this.marginList_;
+    },
+
+    /**
+     * Returns a dictionary of the four custom margin values.
+     * @return {object}
+     */
+    get customMargins() {
+      return {'marginLeft': this.customMarginLeft_,
+              'marginTop': this.customMarginTop_,
+              'marginRight': this.customMarginRight_,
+              'marginBottom': this.customMarginBottom_};
+    },
+
+    /**
+     * Gets the value of the selected margin option.
+     * @private
+     * @return {number}
+     */
+    get selectedMarginsValue_() {
+      return this.marginList_.options[this.marginList_.selectedIndex].value;
+    },
+
+    /**
+     * Checks whether user has selected the Default Margins option or not.
+     *
+     * @return {boolean} true if default margins are selected.
+     */
+    isDefaultMarginsSelected: function() {
+      return this.selectedMarginsValue_ == this.defaultMarginsValue_;
+    },
+
+    /**
+     * Adds listeners to all margin related controls. The listeners take care
+     * of altering their behavior depending on |hasPendingPreviewRequest|.
+     */
+    addEventListeners: function() {
+      this.marginList_.onchange = this.onMarginsChanged_.bind(this);
+      document.addEventListener('PDFLoaded', this.onPDFLoaded_.bind(this));
+    },
+
+    /**
+     * Listener executing when user selects a different margin option, ie,
+     * |this.marginList_| is changed.
+     * @private
+     */
+    onMarginsChanged_: function() {
+      if (this.selectedMarginsValue_ == this.defaultMarginsValue_) {
+        setDefaultValuesAndRegeneratePreview(false);
+      } else if (this.selectedMarginsValue_ == this.noMarginsValue_) {
+        this.customMarginLeft_ = 0;
+        this.customMarginTop_ = 0;
+        this.customMarginRight_ = 0;
+        this.customMarginBottom_ = 0;
+        setDefaultValuesAndRegeneratePreview(false);
+      }
+      // TODO(aayushkumar): Add handler for custom margins
+    },
+
+    /**
+     * If custom margins is the currently selected option then change to the
+     * default margins option.
+     */
+    resetMarginsIfNeeded: function() {
+      if (this.selectedMarginsValue_ == this.customMarginsValue_)
+        this.marginList_.options[this.defaultMarginsIndex_].selected = true;
+    },
+
+    /**
+     * Listener executing when a PDFLoaded event occurs.
+     * @private
+     */
+    onPDFLoaded_: function() {
+      if (!previewModifiable)
+        fadeOutElement(this.marginsOption_);
+    }
+  };
+
+  return {
+    MarginSettings: MarginSettings,
+  };
+});