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Bug 799078. Part 1: Expose nsContentUtils::FindPresShellForDocument. r=matspal

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--HG--
extra : rebase_source : f7e6410637ea70fe2d68fdcc24bcb409816d5bd7
This commit is contained in:
Robert O'Callahan 2012-10-09 00:23:11 +13:00
parent dd6953881f
commit 12170091be
2 changed files with 31 additions and 10 deletions
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13
content/base/public/nsContentUtils.h
View File

@ -1822,12 +1822,23 @@ public:
const nsAString& aClasses,
nsIDOMNodeList** aReturn);
/**
* Returns a presshell for this document, if there is one. This will be
* aDoc's direct presshell if there is one, otherwise we'll look at all
* ancestor documents to try to find a presshell, so for example this can
* still find a presshell for documents in display:none frames that have
* no presentation. So you have to be careful how you use this presshell ---
* getting generic data like a device context or widget from it is OK, but it
* might not be this document's actual presentation.
*/
static nsIPresShell* FindPresShellForDocument(nsIDocument* aDoc);
/**
* Returns the widget for this document if there is one. Looks at all ancestor
* documents to try to find a widget, so for example this can still find a
* widget for documents in display:none frames that have no presentation.
*/
static nsIWidget *WidgetForDocument(nsIDocument *aDoc);
static nsIWidget* WidgetForDocument(nsIDocument* aDoc);
/**
* Returns a layer manager to use for the given document. Basically we

28
content/base/src/nsContentUtils.cpp
View File

@ -6524,8 +6524,8 @@ nsContentUtils::PlatformToDOMLineBreaks(nsString &aString)
}
}
nsIWidget *
nsContentUtils::WidgetForDocument(nsIDocument *aDoc)
nsIPresShell*
nsContentUtils::FindPresShellForDocument(nsIDocument* aDoc)
{
nsIDocument* doc = aDoc;
nsIDocument* displayDoc = doc->GetDisplayDocument();
@ -6534,25 +6534,35 @@ nsContentUtils::WidgetForDocument(nsIDocument *aDoc)
}
nsIPresShell* shell = doc->GetShell();
if (shell) {
return shell;
}
nsCOMPtr<nsISupports> container = doc->GetContainer();
nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = do_QueryInterface(container);
while (!shell && docShellTreeItem) {
while (docShellTreeItem) {
// We may be in a display:none subdocument, or we may not have a presshell
// created yet.
// Walk the docshell tree to find the nearest container that has a presshell,
// and find the root widget from that.
// and return that.
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(docShellTreeItem);
nsCOMPtr<nsIPresShell> presShell;
docShell->GetPresShell(getter_AddRefs(presShell));
if (presShell) {
shell = presShell;
} else {
nsCOMPtr<nsIDocShellTreeItem> parent;
docShellTreeItem->GetParent(getter_AddRefs(parent));
docShellTreeItem = parent;
return presShell;
}
nsCOMPtr<nsIDocShellTreeItem> parent;
docShellTreeItem->GetParent(getter_AddRefs(parent));
docShellTreeItem = parent;
}
return nullptr;
}
nsIWidget*
nsContentUtils::WidgetForDocument(nsIDocument* aDoc)
{
nsIPresShell* shell = FindPresShellForDocument(aDoc);
if (shell) {
nsIViewManager* VM = shell->GetViewManager();
if (VM) {