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DOS/V Power Report 1998 April
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NETCAST.Z
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ncjs10.jar
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layermgr.js
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1997-09-03
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/* layermgr.js
Copyright (c) 1997 Netscape Comunications Corporation,
All Rights Reserved
Handles layer management in an efficient way
*/
function LayerLoadObject(layerObj, url, container, notifier, parameter, external)
{
this.layerObj = layerObj;
this.layerURL = url;
this.container = container;
this.notifier = notifier;
this.parameter = parameter
this.nextLoad = null;
this.external = external;
}
function LayerMgr_NewLayerAndLoad(layerObj, layerLoadObject) {
layerLoadObject.layerObj = layerObj;
window.layerManager.layerLoad(layerLoadObject);
return;
}
function LayerMgr_LayerLoad(layerLoadObject)
{
if (this.mgrBusy == true) {
setTimeout(this.layerLoad, 100, layerLoadObject);
}
this.mgrBusy = true;
if ((!this.lastLoad) || (this.lastLoad == null)) {
this.loading = layerLoadObject;
this.lastLoad = layerLoadObject;
this.mgrBusy = false;
this.startLoad();
} else {
this.lastLoad.nextLoad = layerLoadObject;
this.lastLoad = layerLoadObject;
this.mgrBusy = false;
}
return;
}
function LayerMgr_StartNextLoad()
{
var loadObject = this.loading;
if (loadObject && (loadObject != null)) {
if (this.isLoading == true) {
java.lang.System.out.println("Warning: another layer is already loading");
}
this.isLoading = true;
if (loadObject.layerObj == null) {
var newLayer = this.layerNew(200, loadObject.container);
if (loadObject.layerURL != null) {
window.layerManager.loading.layerObj = newLayer;;
newLayer.visibility = "show";
newLayer.src = loadObject.layerURL;
if(loadObject.external == true) {
newLayer.__parent__ = null;
newLayer.initStandardObjects();
newLayer.Event = Event;
}
}
} else {
loadObject.visibility = "show";
loadObject.layerObj.src = loadObject.layerURL;
if(loadObject.external == true) {
loadObject.layerObj.__parent__ = null;
loadObject.layerObj.initStandardObjects();
loadObject.layerObj.Event = Event;
}
}
this.isLoading = false;
}
}
function LayerMgr_CaptureLoad(e)
{
var currentLoad = window.layerManager.loading;
if (currentLoad && (currentLoad != null)) {
if (currentLoad.layerObj != e.target) {
if (e.target != window) {
window.routeEvent(e);
} else {
if (window.onLoadHandler && (window.onLoadHandler != null)) {
window.onLoadHandler(e);
}
}
return;
}
if (currentLoad.notifier != null && currentLoad.notifier.layerLoaded) {
currentLoad.notifier.layerLoaded(e.target, currentLoad.parameter);
}
window.layerManager.loading = window.layerManager.loading.nextLoad;
if (window.layerManager.loading == null) {
window.layerManager.lastLoad = null;
}
}
if (e.target != window) {
window.routeEvent(e);
} else {
if (window.onLoadHandler && (window.onLoadHandler != null)) {
window.onLoadHandler(e);
}
}
window.layerManager.startLoad();
}
function LayerMgr_NewLayer(width, parent)
{
var returnLayer;
var count;
count = this.layerCount--;
if (count > 0) {
returnLayer = this.layerArray[count];
} else {
this.layerCount++;
returnLayer = new Layer(width, parent);
}
return returnLayer;
}
function LayerMgr_DeleteLayer(thisLayer)
{
if (thisLayer && thisLayer != null) {
thisLayer.src="about:blank";
var count = this.layerCount++;
this.layerArray[count] = thisLayer;
}
return;
}
function LayerManager() {
this.layerCount = 0;
this.layerArray = new Array(5);
this.layerDelete = LayerMgr_DeleteLayer;
this.layerNew = LayerMgr_NewLayer;
this.loading = null;
this.lastLoad = null;
this.layerLoad = LayerMgr_LayerLoad;
this.startLoad = LayerMgr_StartNextLoad;
this.mgrBusy = false;
this.isLoading = false;
netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserWrite");
window.enableExternalCapture();
document.captureEvents(Event.LOAD);
document.onload = LayerMgr_CaptureLoad;
window.layerManager = this;
}
void(0);