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-rw-r--r--misc/openlayers/lib/OpenLayers/Tile/Image/IFrame.js233
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diff --git a/misc/openlayers/lib/OpenLayers/Tile/Image/IFrame.js b/misc/openlayers/lib/OpenLayers/Tile/Image/IFrame.js
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--- a/misc/openlayers/lib/OpenLayers/Tile/Image/IFrame.js
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-/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
- * full list of contributors). Published under the 2-clause BSD license.
- * See license.txt in the OpenLayers distribution or repository for the
- * full text of the license. */
-
-
-/**
- * @requires OpenLayers/Tile/Image.js
- */
-
-/**
- * Constant: OpenLayers.Tile.Image.IFrame
- * Mixin for tiles that use form-encoded POST requests to get images from
- * remote services. Images will be loaded using HTTP-POST into an IFrame.
- *
- * This mixin will be applied to <OpenLayers.Tile.Image> instances
- * configured with <OpenLayers.Tile.Image.maxGetUrlLength> set.
- */
-OpenLayers.Tile.Image.IFrame = {
-
- /**
- * Property: useIFrame
- * {Boolean} true if we are currently using an IFrame to render POST
- * responses, false if we are using an img element to render GET responses.
- */
- useIFrame: null,
-
- /**
- * Property: blankImageUrl
- * {String} Using a data scheme url is not supported by all browsers, but
- * we don't care because we either set it as css backgroundImage, or the
- * image's display style is set to "none" when we use it.
- */
- blankImageUrl: "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAQAIBRAA7",
-
- /**
- * Method: draw
- * Set useIFrame in the instance, and operate the image/iframe switch.
- * Then call Tile.Image.draw.
- *
- * Returns:
- * {Boolean}
- */
- draw: function() {
- var draw = OpenLayers.Tile.Image.prototype.shouldDraw.call(this);
- if(draw) {
-
- // this.url isn't set to the currect value yet, so we call getURL
- // on the layer and store the result in a local variable
- var url = this.layer.getURL(this.bounds);
-
- var usedIFrame = this.useIFrame;
- this.useIFrame = this.maxGetUrlLength !== null &&
- !this.layer.async &&
- url.length > this.maxGetUrlLength;
-
- var fromIFrame = usedIFrame && !this.useIFrame;
- var toIFrame = !usedIFrame && this.useIFrame;
-
- if(fromIFrame || toIFrame) {
-
- // Switching between GET (image) and POST (iframe).
-
- // We remove the imgDiv (really either an image or an iframe)
- // from the frame and set it to null to make sure initImage
- // will call getImage.
-
- if(this.imgDiv && this.imgDiv.parentNode === this.frame) {
- this.frame.removeChild(this.imgDiv);
- }
- this.imgDiv = null;
-
- // And if we had an iframe we also remove the event pane.
-
- if(fromIFrame) {
- this.frame.removeChild(this.frame.firstChild);
- }
- }
- }
- return OpenLayers.Tile.Image.prototype.draw.apply(this, arguments);
- },
-
- /**
- * Method: getImage
- * Creates the content for the frame on the tile.
- */
- getImage: function() {
- if (this.useIFrame === true) {
- if (!this.frame.childNodes.length) {
- var eventPane = document.createElement("div"),
- style = eventPane.style;
- style.position = "absolute";
- style.width = "100%";
- style.height = "100%";
- style.zIndex = 1;
- style.backgroundImage = "url(" + this.blankImageUrl + ")";
- this.frame.appendChild(eventPane);
- }
-
- var id = this.id + '_iFrame', iframe;
- if (parseFloat(navigator.appVersion.split("MSIE")[1]) < 9) {
- // Older IE versions do not set the name attribute of an iFrame
- // properly via DOM manipulation, so we need to do it on our own with
- // this hack.
- iframe = document.createElement('<iframe name="'+id+'">');
-
- // IFrames in older IE versions are not transparent, if you set
- // the backgroundColor transparent. This is a workaround to get
- // transparent iframes.
- iframe.style.backgroundColor = '#FFFFFF';
- iframe.style.filter = 'chroma(color=#FFFFFF)';
- }
- else {
- iframe = document.createElement('iframe');
- iframe.style.backgroundColor = 'transparent';
-
- // iframe.name needs to be an unique id, otherwise it
- // could happen that other iframes are overwritten.
- iframe.name = id;
- }
-
- // some special properties to avoid scaling the images and scrollbars
- // in the iframe
- iframe.scrolling = 'no';
- iframe.marginWidth = '0px';
- iframe.marginHeight = '0px';
- iframe.frameBorder = '0';
-
- iframe.style.position = "absolute";
- iframe.style.width = "100%";
- iframe.style.height = "100%";
-
- if (this.layer.opacity < 1) {
- OpenLayers.Util.modifyDOMElement(iframe, null, null, null,
- null, null, null, this.layer.opacity);
- }
- this.frame.appendChild(iframe);
- this.imgDiv = iframe;
- return iframe;
- } else {
- return OpenLayers.Tile.Image.prototype.getImage.apply(this, arguments);
- }
- },
-
- /**
- * Method: createRequestForm
- * Create the html <form> element with width, height, bbox and all
- * parameters specified in the layer params.
- *
- * Returns:
- * {DOMElement} The form element which sends the HTTP-POST request to the
- * WMS.
- */
- createRequestForm: function() {
- // creation of the form element
- var form = document.createElement('form');
- form.method = 'POST';
- var cacheId = this.layer.params["_OLSALT"];
- cacheId = (cacheId ? cacheId + "_" : "") + this.bounds.toBBOX();
- form.action = OpenLayers.Util.urlAppend(this.layer.url, cacheId);
- form.target = this.id + '_iFrame';
-
- // adding all parameters in layer params as hidden fields to the html
- // form element
- var imageSize = this.layer.getImageSize(),
- params = OpenLayers.Util.getParameters(this.url),
- field;
-
- for(var par in params) {
- field = document.createElement('input');
- field.type = 'hidden';
- field.name = par;
- field.value = params[par];
- form.appendChild(field);
- }
-
- return form;
- },
-
- /**
- * Method: setImgSrc
- * Sets the source for the tile image
- *
- * Parameters:
- * url - {String}
- */
- setImgSrc: function(url) {
- if (this.useIFrame === true) {
- if (url) {
- var form = this.createRequestForm();
- this.frame.appendChild(form);
- form.submit();
- this.frame.removeChild(form);
- } else if (this.imgDiv.parentNode === this.frame) {
- // we don't reuse iframes to avoid caching issues
- this.frame.removeChild(this.imgDiv);
- this.imgDiv = null;
- }
- } else {
- OpenLayers.Tile.Image.prototype.setImgSrc.apply(this, arguments);
- }
- },
-
- /**
- * Method: onImageLoad
- * Handler for the image onload event
- */
- onImageLoad: function() {
- //TODO de-uglify opacity handling
- OpenLayers.Tile.Image.prototype.onImageLoad.apply(this, arguments);
- if (this.useIFrame === true) {
- this.imgDiv.style.opacity = 1;
- this.frame.style.opacity = this.layer.opacity;
- }
- },
-
- /**
- * Method: createBackBuffer
- * Override createBackBuffer to do nothing when we use an iframe. Moving an
- * iframe from one element to another makes it necessary to reload the iframe
- * because its content is lost. So we just give up.
- *
- * Returns:
- * {DOMElement}
- */
- createBackBuffer: function() {
- var backBuffer;
- if(this.useIFrame === false) {
- backBuffer = OpenLayers.Tile.Image.prototype.createBackBuffer.call(this);
- }
- return backBuffer;
- }
-};
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