basic scrolling renderer

lib/epubjs/layout.js

@@ -0,0 +1,95 @@
+/**
+* Reconciles the current chapters layout properies with
+* the global layout properities.
+* Takes: global layout settings object, chapter properties string
+* Returns: Object with layout properties
+*/
+EPUBJS.Renderer.prototype.reconcileLayoutSettings = function(global, chapter){
+  var settings = {};
+
+  //-- Get the global defaults
+  for (var attr in global) {
+    if (global.hasOwnProperty(attr)){
+      settings[attr] = global[attr];
+    }
+  }
+  //-- Get the chapter's display type
+  chapter.forEach(function(prop){
+    var rendition = prop.replace("rendition:", '');
+    var split = rendition.indexOf("-");
+    var property, value;
+
+    if(split != -1){
+      property = rendition.slice(0, split);
+      value = rendition.slice(split+1);
+
+      settings[property] = value;
+    }
+  });
+ return settings;
+};
+
+/**
+* Uses the settings to determine which Layout Method is needed
+* Triggers events based on the method choosen
+* Takes: Layout settings object
+* Returns: String of appropriate for EPUBJS.Layout function
+*/
+EPUBJS.Renderer.prototype.determineLayout = function(settings){
+  // Default is layout: reflowable & spread: auto
+  var spreads = this.determineSpreads(this.minSpreadWidth);
+  var layoutMethod = spreads ? "ReflowableSpreads" : "Reflowable";
+  var scroll = false;
+
+  if(settings.layout === "pre-paginated") {
+    layoutMethod = "Fixed";
+    scroll = true;
+    spreads = false;
+  }
+
+  if(settings.layout === "reflowable" && settings.spread === "none") {
+    layoutMethod = "Reflowable";
+    scroll = false;
+    spreads = false;
+  }
+
+  if(settings.layout === "reflowable" && settings.spread === "both") {
+    layoutMethod = "ReflowableSpreads";
+    scroll = false;
+    spreads = true;
+  }
+
+  this.spreads = spreads;
+  this.render.scroll(scroll);
+  this.trigger("renderer:spreads", spreads);
+  return layoutMethod;
+};
+
+//-- STYLES
+
+EPUBJS.Renderer.prototype.applyStyles = function(styles) {
+  for (var style in styles) {
+    for (var view in this.views) {
+      view.setStyle(style, styles[style]);
+    }
+  }
+};
+
+EPUBJS.Renderer.prototype.setStyle = function(style, val, prefixed){
+  for (var view in this.views) {
+    view.setStyle(style, val, prefixed);
+  }
+};
+
+EPUBJS.Renderer.prototype.removeStyle = function(style){
+  for (var view in this.views) {
+    view.removeStyle(style);
+  }
+};
+
+//-- HEAD TAGS
+EPUBJS.Renderer.prototype.applyHeadTags = function(headTags) {
+  for ( var headTag in headTags ) {
+    this.render.addHeadTag(headTag, headTags[headTag]);
+  }
+};