blob: d3752be88ba5e763fdcb687bb82453f1f9b8b312 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/events/event_rewriter.h"
#include <utility>
#include "ui/events/event_rewriter_continuation.h"
#include "ui/events/event_source.h"
namespace ui {
namespace {
ui::EventDispatchDetails DispatcherDestroyed() {
ui::EventDispatchDetails details;
details.dispatcher_destroyed = true;
return details;
}
} // anonymous namespace
// Temporary fallback implementation, in terms of the old API,
// factored out of EventSource::SendEventToSinkFromRewriter().
// TODO(kpschoedel): Remove along with old API.
EventDispatchDetails EventRewriter::RewriteEvent(
const Event& event,
const Continuation continuation) {
std::unique_ptr<Event> rewritten_event;
EventRewriteStatus status = RewriteEvent(event, &rewritten_event);
if (status == EVENT_REWRITE_DISCARD) {
CHECK(!rewritten_event);
return continuation->DiscardEvent();
}
if (status == EVENT_REWRITE_CONTINUE) {
CHECK(!rewritten_event);
return continuation->SendEvent(&event);
}
CHECK(rewritten_event);
EventDispatchDetails details =
continuation->SendEventFinally(rewritten_event.get());
while (status == EVENT_REWRITE_DISPATCH_ANOTHER) {
if (details.dispatcher_destroyed)
return details;
std::unique_ptr<Event> new_event;
status = NextDispatchEvent(*rewritten_event, &new_event);
if (status == EVENT_REWRITE_DISCARD)
return continuation->DiscardEvent();
CHECK_NE(EVENT_REWRITE_CONTINUE, status);
CHECK(new_event);
details = continuation->SendEventFinally(new_event.get());
rewritten_event = std::move(new_event);
}
return details;
}
// Temporary default implementation of the old API, so that subclasses'
// implementations can be removed.
// TODO(kpschoedel): Remove old API.
EventRewriteStatus EventRewriter::RewriteEvent(
const Event& event,
std::unique_ptr<Event>* rewritten_event) {
NOTREACHED();
return EVENT_REWRITE_DISCARD;
}
// Temporary default implementation of the old API, so that subclasses'
// implementations can be removed.
// TODO(kpschoedel): Remove old API.
EventRewriteStatus EventRewriter::NextDispatchEvent(
const Event& last_event,
std::unique_ptr<Event>* new_event) {
NOTREACHED();
return EVENT_REWRITE_DISCARD;
}
// TODO(kpschoedel): Remove old API.
EventDispatchDetails EventRewriter::SendEventToEventSource(EventSource* source,
Event* event) const {
return source->SendEventToSinkFromRewriter(event, this);
}
EventDispatchDetails EventRewriter::SendEvent(const Continuation continuation,
const Event* event) {
return continuation ? continuation->SendEvent(event) : DispatcherDestroyed();
}
EventDispatchDetails EventRewriter::SendEventFinally(
const Continuation continuation,
const Event* event) {
return continuation ? continuation->SendEventFinally(event)
: DispatcherDestroyed();
}
EventDispatchDetails EventRewriter::DiscardEvent(
const Continuation continuation) {
return continuation ? continuation->DiscardEvent()
: DispatcherDestroyed();
}
} // namespace ui