📄 gwt.js
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// Copyright 2006 Google Inc.// // 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// // http://www.apache.org/licenses/LICENSE-2.0// // Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the// License for the specific language governing permissions and limitations under// the License.// // This startup script should be included in host pages either just after// <body> or inside the <head> after module <meta> tags.////////////////////////////////////////////////////////////////////////////////// DynamicResources//function DynamicResources() { this.pendingElemsBySrc_ = {}; this.pendingScriptElems_ = new Array();}DynamicResources.prototype = {};// The array is set up such that, pairwise, the entries are (src, readyFnStr).// Called once for each module that is attached to the host page.// It is theoretically possible that addScripts() could be called reentrantly// if the browser event loop is pumped during this function and an iframe loads; // we may want to enhance this method in the future to support that case.DynamicResources.prototype.addScripts = function(scriptArray, insertBeforeElem) { var wasEmpty = (this.pendingScriptElems_.length == 0); var anyAdded = false; for (var i = 0, n = scriptArray.length; i < n; i += 2) { var src = scriptArray[i]; if (this.pendingElemsBySrc_[src]) { // Don't load the same script twice. continue; } // Set up the element but don't add it to the DOM until its turn. anyAdded = true; var e = document.createElement("script"); this.pendingElemsBySrc_[src] = e; var readyFn; eval("readyFn = " + scriptArray[i+1]); e.__readyFn = readyFn; e.type = "text/javascript"; e.src = src; e.__insertBeforeElem = insertBeforeElem; this.pendingScriptElems_ = this.pendingScriptElems_.concat(e); } if (wasEmpty && anyAdded) { // Kickstart. this.injectScript(this.pendingScriptElems_[0]); }}DynamicResources.prototype.injectScript = function(scriptElem) { var parentElem = scriptElem.__insertBeforeElem.parentNode; parentElem.insertBefore(scriptElem, scriptElem.__insertBeforeElem);}DynamicResources.prototype.addStyles = function(styleSrcArray, insertBeforeElem) { var parent = insertBeforeElem.parentNode; for (var i = 0, n = styleSrcArray.length; i < n; ++i) { var src = styleSrcArray[i]; if (this.pendingElemsBySrc_[src]) continue; var e = document.createElement("link"); this.pendingElemsBySrc_[src] = e; e.type = "text/css"; e.rel = "stylesheet"; e.href = src; parent.insertBefore(e, insertBeforeElem); }}DynamicResources.prototype.isReady = function() { var elems = this.pendingScriptElems_; if (elems.length > 0) { var e = elems[0]; if (!e.__readyFn()) { // The pending script isn't ready yet. return false; } // The pending script has now finished loading. Enqueue the next, if any. e.__readyFn = null; elems.shift(); if (elems.length > 0) { // There is another script. this.injectScript(elems[0]); return false; } } // There are no more pending scripts. return true;}//////////////////////////////////////////////////////////////////////////////// ModuleControlBlock//function ModuleControlBlock(metaElem, rawName) { var parts = ["", rawName]; var i = rawName.lastIndexOf("="); if (i != -1) { parts[0] = rawName.substring(0, i) + '/'; parts[1] = rawName.substring(i+1); } this.metaElem_ = metaElem; this.baseUrl_ = parts[0]; this.name_ = parts[1]; this.compilationLoaded_ = false; this.frameWnd_ = null;}ModuleControlBlock.prototype = {};/** * Determines whether this module is fully loaded and ready to run. */ModuleControlBlock.prototype.isReady = function() { return this.compilationLoaded_;};/** * Called when the compilation for this module is loaded. */ModuleControlBlock.prototype.compilationLoaded = function(frameWnd) { this.frameWnd_ = frameWnd; this.compilationLoaded_ = true;}/** * Gets the logical module name, not including a base url prefix if one was * specified. */ModuleControlBlock.prototype.getName = function() { return this.name_;}/** * Gets the base URL of the module, guaranteed to end with a slash. */ModuleControlBlock.prototype.getBaseURL = function() { return this.baseUrl_;}/** * Gets the window of the module's frame. */ModuleControlBlock.prototype.getModuleFrameWindow = function() { return this.frameWnd_;}/** * Injects a set of dynamic scripts. * The array is set up such that, pairwise, the entries are (src, readyFnStr). */ModuleControlBlock.prototype.addScripts = function(scriptSrcArray) { return ModuleControlBlocks.dynamicResources_.addScripts(scriptSrcArray, this.metaElem_);}/** * Injects a set of dynamic styles. */ModuleControlBlock.prototype.addStyles = function(styleSrcArray) { return ModuleControlBlocks.dynamicResources_.addStyles(styleSrcArray, this.metaElem_);} //////////////////////////////////////////////////////////////////////////////// ModuleControlBlocks//function ModuleControlBlocks() { this.blocks_ = [];}ModuleControlBlocks.dynamicResources_ = new DynamicResources(); // "static"ModuleControlBlocks.prototype = {};/** * Adds a module control control block for the named module. * @param metaElem the meta element that caused the module to be added * @param name the name of the module being added, optionally preceded by * an alternate base url of the form "_path_=_module_". */ModuleControlBlocks.prototype.add = function(metaElem, name) { var mcb = new ModuleControlBlock(metaElem, name); this.blocks_ = this.blocks_.concat(mcb);};/** * Determines whether all the modules are loaded and ready to run. */ModuleControlBlocks.prototype.isReady = function() { for (var i = 0, n = this.blocks_.length; i < n; ++i) { var mcb = this.blocks_[i]; if (!mcb.isReady()) { return false; } } // Are there any pending dynamic resources (e.g. styles, scripts)? if (!ModuleControlBlocks.dynamicResources_.isReady()) { // No, we're still waiting on one or more dynamic resources. return false; } return true;}/** * Determines whether there are any module control blocks. */ModuleControlBlocks.prototype.isEmpty = function() { return this.blocks_.length == 0;}/** * Gets the module control block at the specified index. */ModuleControlBlocks.prototype.get = function(index) { return this.blocks_[index];}/** * Injects an iframe for each module. */ModuleControlBlocks.prototype.injectFrames = function() { for (var i = 0, n = this.blocks_.length; i < n; ++i) { var mcb = this.blocks_[i]; // Insert an iframe for the module var iframe = document.createElement("iframe"); var selectorUrl = mcb.getBaseURL() + mcb.getName() + ".nocache.html"; selectorUrl += "?" + (__gwt_isHosted() ? "h&" : "" ) + i; var unique = new Date().getTime(); selectorUrl += "&" + unique; iframe.style.border = '0px'; iframe.style.width = '0px'; iframe.style.height = '0px'; // Fragile browser-specific ordering issues below /*@cc_on // prevent extra clicky noises on IE iframe.src = selectorUrl;@*/ if (document.body.firstChild) { document.body.insertBefore(iframe, document.body.firstChild); } else { document.body.appendChild(iframe); } /*@cc_on // prevent extra clicky noises on IE return;@*/ if (iframe.contentWindow) { // Older Mozilla has a caching bug for the iframe and won't reload the nocache. iframe.contentWindow.location.replace(selectorUrl); } else { // Older Safari doesn't have a contentWindow. iframe.src = selectorUrl; } }}/** * Runs the entry point for each module. */ModuleControlBlocks.prototype.run = function() { for (var i = 0, n = this.blocks_.length; i < n; ++i) { var mcb = this.blocks_[i]; var name = mcb.getName(); var frameWnd = mcb.getModuleFrameWindow(); if (__gwt_isHosted()) { if (!window.external.gwtOnLoad(frameWnd, name)) { // Module failed to load. if (__gwt_onLoadError) { __gwt_onLoadError(name); } else { window.alert("Failed to load module '" + name + "'.\nPlease see the log in the development shell for details."); } } } else { // The compilation itself handles calling the error function. frameWnd.gwtOnLoad(__gwt_onLoadError, name); }⌨️ 快捷键说明
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