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necessary adaptations to the Tile.IFrame mixin - back buffering is disabled when using POST and iframe tiles

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This commit is contained in:
Éric Lemoine
2011-10-19 23:19:29 +02:00
parent a37202ac09
commit 853bfeaee1
1 changed files with 59 additions and 31 deletions
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62
lib/OpenLayers/Tile/Image/IFrame.js
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@@ -29,38 +29,50 @@ OpenLayers.Tile.Image.IFrame = {
useIFrame: null,
/**
* Method: updateBackBuffer
* Update the <backBufferData>, and return a new or reposition the
* backBuffer. When a backbuffer is returned, the tile's markup is not
* available any more.
* Method: draw
* Set useIFrame in the instance, and operate the to/from image from/to
* iframe switch, if necessary. Then call the parent function.
*
* Returns:
* {HTMLDivElement} the tile's markup in a cloned element, or undefined if
* no backbuffer is currently available or needed
* {Boolean}
*/
updateBackBuffer: function() {
this.url = this.layer.getURL(this.bounds);
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 &&
this.url.length > this.maxGetUrlLength;
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) {
// switch between get (image) and post (iframe)
this.clear();
// 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 createImage.
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) {
// remove eventPane
this.frame.removeChild(this.frame.firstChild);
this.resetBackBuffer();
}
}
if (!this.useIFrame) {
OpenLayers.Tile.Image.prototype.updateBackBuffer.apply(this, arguments);
}
return OpenLayers.Tile.Image.prototype.draw.apply(this, arguments);
},
/**
@@ -183,6 +195,22 @@ OpenLayers.Tile.Image.IFrame = {
} else {
OpenLayers.Tile.Image.prototype.setImgSrc.apply(this, arguments);
}
}
},
/**
* Method: cloneMarkup
* Override cloneMarkup to not attempt cloning 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}
*/
cloneMarkup: function() {
var clone;
if(!this.useIFrame) {
clone = OpenLayers.Tile.Image.prototype.cloneMarkup.call(this);
}
return clone;
}
};