我该使用哪些XPCOM接口在Firefox扩展中检测标签页的打开、关闭和切换,以及获取它们关联的URL?我看过一些用JS管理标签页的代码实例,但是在C++中怎么做呢?
我该使用哪些XPCOM接口在Firefox扩展中检测标签页的打开、关闭和切换,以及获取它们关联的URL?我看过一些用JS管理标签页的代码实例,但是在C++中怎么做呢?
NS_IMETHODIMP MyCppComponent::Observe(nsISupports *aSubject,
const char *aTopic,
const PRUnichar *aData)
{
if( !strcmp( aTopic, "xpcom-startup" ) )
{
nsCOMPtr<nsIObserverService> observerService =
do_GetService( "@mozilla.org/observer-service;1" );
observerService->AddObserver( this, "my-tab-open", false );
observerService->AddObserver( this, "my-tab-close", false );
observerService->AddObserver( this, "my-tab-select", false );
}
else if( !strcmp( aTopic, "my-tab-open" ) )
{
/* . . . */
}
else if( !strcmp( aTopic, "my-tab-close" ) )
{
/* . . . */
}
else if( !strcmp( aTopic, "my-tab-select" ) )
{
/* . . . */
}
/* . . . */
}
function tabOpened(event) {
var obsSvc = CC["@mozilla.org/observer-service;1"].
getService(CI.nsIObserverService);
obsSvc.notifyObservers(event.target.linkedBrowser.contentWindow,
"my-tab-open", "some data");
}
function tabClosed(event) {
var obsSvc = CC["@mozilla.org/observer-service;1"].
getService(CI.nsIObserverService);
obsSvc.notifyObservers(event.target.linkedBrowser.contentWindow,
"my-tab-close", "some data");
}
function tabSelected(event) {
var obsSvc = CC["@mozilla.org/observer-service;1"].
getService(CI.nsIObserverService);
obsSvc.notifyObservers(event.target.linkedBrowser.contentWindow,
"my-tab-select", "some data");
}
function contentWndLoad(event) {
var obsSvc = CC["@mozilla.org/observer-service;1"].
getService(CI.nsIObserverService);
var browser = getMostRecentBrowserWindow().getBrowser();
browser.tabContainer.addEventListener("TabOpen", tabOpened, false);
browser.tabContainer.addEventListener("TabClose", tabClosed, false);
browser.tabContainer.addEventListener("TabSelect", tabSelected, false);
}
MyJsComponent.prototype = {
/* . . . */
observe: function(aSubject, aTopic, aData) {
switch(aTopic) {
case "xpcom-startup":
var obsSvc = CC["@mozilla.org/observer-service;1"].
getService(CI.nsIObserverService);
obsSvc.addObserver(this, "toplevel-window-ready", false);
break;
case "toplevel-window-ready":
aSubject.addEventListener("load", contentWndLoad, false);
break;
}
}
/* . . . */
}
此外,还有一些额外的代码需要添加以处理特定情况。例如,当用户关闭浏览器窗口时,您将无法接收到该窗口中打开的选项卡的TabClose事件...而且不要忘记在不再需要观察者时注销它们。