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First part of refactoring constellation to support iframe navigation.

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The history is now recorded per frame, but needs to be exposed in a followup PR.

Also fixes a race condition that occurs loading iframes under heavy CPU load.

This ensures that iframes never do a reflow / layout until they have a valid
window size set from their parent frame.
This commit is contained in:
Glenn Watson 2015-03-13 15:08:02 +10:00
parent 0888a3a16d
commit 939a89568e
11 changed files with 587 additions and 921 deletions
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66
components/script/script_task.rs
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@ -33,6 +33,7 @@ use dom::bindings::utils::{wrap_for_same_compartment, pre_wrap};
use dom::document::{Document, IsHTMLDocument, DocumentHelpers, DocumentProgressHandler, DocumentProgressTask, DocumentSource};
use dom::element::{Element, AttributeHandlers};
use dom::event::{Event, EventHelpers, EventBubbles, EventCancelable};
use dom::htmliframeelement::HTMLIFrameElementHelpers;
use dom::uievent::UIEvent;
use dom::eventtarget::EventTarget;
use dom::node::{self, Node, NodeHelpers, NodeDamage, window_from_node};
@ -116,7 +117,7 @@ struct InProgressLoad {
/// The parent pipeline and child subpage associated with this load, if any.
subpage_id: Option<(PipelineId, SubpageId)>,
/// The current window size associated with this pipeline.
window_size: WindowSizeData,
window_size: Option<WindowSizeData>,
/// Channel to the layout task associated with this pipeline.
layout_chan: LayoutChan,
/// The current viewport clipping rectangle applying to this pipelie, if any.
@ -130,7 +131,7 @@ impl InProgressLoad {
fn new(id: PipelineId,
subpage_id: Option<(PipelineId, SubpageId)>,
layout_chan: LayoutChan,
window_size: WindowSizeData,
window_size: Option<WindowSizeData>,
url: Url) -> InProgressLoad {
InProgressLoad {
pipeline_id: id,
@ -161,7 +162,7 @@ pub enum ScriptMsg {
TriggerFragment(PipelineId, String),
/// Begins a content-initiated load on the specified pipeline (only
/// dispatched to ScriptTask).
TriggerLoad(PipelineId, LoadData),
Navigate(PipelineId, LoadData),
/// Fires a JavaScript timeout
/// TimerSource must be FromWindow when dispatched to ScriptTask and
/// must be FromWorker when dispatched to a DedicatedGlobalWorkerScope
@ -340,7 +341,7 @@ impl ScriptTaskFactory for ScriptTask {
storage_task: StorageTask,
image_cache_task: ImageCacheTask,
devtools_chan: Option<DevtoolsControlChan>,
window_size: WindowSizeData,
window_size: Option<WindowSizeData>,
load_data: LoadData)
where C: ScriptListener + Send + 'static {
let ConstellationChan(const_chan) = constellation_chan.clone();
@ -620,8 +621,8 @@ impl ScriptTask {
match msg {
ConstellationControlMsg::AttachLayout(_) =>
panic!("should have handled AttachLayout already"),
ConstellationControlMsg::Activate(id) =>
self.handle_activate(id),
ConstellationControlMsg::Navigate(pipeline_id, subpage_id, load_data) =>
self.handle_navigate(pipeline_id, Some(subpage_id), load_data),
ConstellationControlMsg::SendEvent(id, event) =>
self.handle_event(id, event),
ConstellationControlMsg::ReflowComplete(id, reflow_id) =>
@ -645,8 +646,8 @@ impl ScriptTask {
fn handle_msg_from_script(&self, msg: ScriptMsg) {
match msg {
ScriptMsg::TriggerLoad(id, load_data) =>
self.trigger_load(id, load_data),
ScriptMsg::Navigate(id, load_data) =>
self.handle_navigate(id, None, load_data),
ScriptMsg::TriggerFragment(id, fragment) =>
self.trigger_fragment(id, fragment),
ScriptMsg::FireTimer(TimerSource::FromWindow(id), timer_id) =>
@ -697,7 +698,7 @@ impl ScriptTask {
}
let mut loads = self.incomplete_loads.borrow_mut();
if let Some(ref mut load) = loads.iter_mut().find(|load| load.pipeline_id == id) {
load.window_size = size;
load.window_size = Some(size);
return;
}
panic!("resize sent to nonexistent pipeline");
@ -726,7 +727,7 @@ impl ScriptTask {
/// Handle a request to load a page in a new child frame of an existing page.
fn handle_new_layout(&self, new_layout_info: NewLayoutInfo) {
let NewLayoutInfo {
old_pipeline_id,
containing_pipeline_id,
new_pipeline_id,
subpage_id,
layout_chan,
@ -734,7 +735,7 @@ impl ScriptTask {
} = new_layout_info;
let page = self.root_page();
let parent_page = page.find(old_pipeline_id).expect("ScriptTask: received a layout
let parent_page = page.find(containing_pipeline_id).expect("ScriptTask: received a layout
whose parent has a PipelineId which does not correspond to a pipeline in the script
task's page tree. This is a bug.");
@ -742,7 +743,7 @@ impl ScriptTask {
let chan = layout_chan.downcast_ref::<Sender<layout_interface::Msg>>().unwrap();
let layout_chan = LayoutChan(chan.clone());
// Kick off the fetch for the new resource.
let new_load = InProgressLoad::new(new_pipeline_id, Some((old_pipeline_id, subpage_id)),
let new_load = InProgressLoad::new(new_pipeline_id, Some((containing_pipeline_id, subpage_id)),
layout_chan, parent_window.r().window_size(),
load_data.url.clone());
self.start_page_load(new_load, load_data);
@ -768,24 +769,17 @@ impl ScriptTask {
/// Handles thaw message
fn handle_thaw_msg(&self, id: PipelineId) {
let page = self.root_page();
let page = page.find(id).expect("ScriptTask: received thaw msg for a
pipeline ID not associated with this script task. This is a bug.");
let window = page.window().root();
window.r().thaw();
}
/// Handle a request to make a previously-created pipeline active.
//TODO: unsuspend JS and timers, etc. when we support such things.
fn handle_activate(&self, pipeline_id: PipelineId) {
// We should only get this message when moving in history, so all pages requested
// should exist.
let page = self.root_page().find(pipeline_id).unwrap();
let page = self.root_page().find(id).unwrap();
let needed_reflow = page.set_reflow_status(false);
if needed_reflow {
self.force_reflow(&*page, ReflowReason::CachedPageNeededReflow);
}
let window = page.window().root();
window.r().thaw();
}
/// Handles a notification that reflow completed.
@ -1138,11 +1132,29 @@ impl ScriptTask {
}
}
/// https://html.spec.whatwg.org/multipage/browsers.html#navigating-across-documents
/// The entry point for content to notify that a new load has been requested
/// for the given pipeline.
fn trigger_load(&self, pipeline_id: PipelineId, load_data: LoadData) {
let ConstellationChan(ref const_chan) = self.constellation_chan;
const_chan.send(ConstellationMsg::LoadUrl(pipeline_id, load_data)).unwrap();
/// for the given pipeline (specifically the "navigate" algorithm).
fn handle_navigate(&self, pipeline_id: PipelineId, subpage_id: Option<SubpageId>, load_data: LoadData) {
match subpage_id {
Some(subpage_id) => {
let borrowed_page = self.root_page();
let iframe = borrowed_page.find(pipeline_id).and_then(|page| {
let doc = page.document().root();
let doc: JSRef<Node> = NodeCast::from_ref(doc.r());
doc.traverse_preorder()
.filter_map(HTMLIFrameElementCast::to_ref)
.find(|node| node.subpage_id() == Some(subpage_id))
.map(Temporary::from_rooted)
}).root();
iframe.r().unwrap().navigate_child_browsing_context(load_data.url);
}
None => {
let ConstellationChan(ref const_chan) = self.constellation_chan;
const_chan.send(ConstellationMsg::LoadUrl(pipeline_id, load_data)).unwrap();
}
}
}
/// The entry point for content to notify that a fragment url has been requested