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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/accessibility/drag_event_rewriter.h"
namespace ash {
void DragEventRewriter::SetEnabled(bool enabled) {
enabled_ = enabled;
}
bool DragEventRewriter::IsEnabled() const {
return enabled_;
}
ui::EventDispatchDetails DragEventRewriter::RewriteEvent(
const ui::Event& event,
const Continuation continuation) {
// Only rewrite mouse moved events to drag events when enabled.
if (!enabled_) {
return SendEvent(continuation, &event);
}
// On touchpads, a SCROLL_FLING_CANCEL can also indicate the start of a drag.
// If this rewriter is enabled, a SCROLL_FLING_CANCEL should simply be
// ignored.
if (event.type() == ui::EventType::kScrollFlingCancel) {
return DiscardEvent(continuation);
}
// Only rewrite move events, but any other type should still go through.
if (event.type() != ui::EventType::kMouseMoved) {
return SendEvent(continuation, &event);
}
const ui::MouseEvent* mouse_event = event.AsMouseEvent();
// "Press" the left mouse button to make it seem like the user is holding it
// down.
int flags = mouse_event->flags() | ui::EF_LEFT_MOUSE_BUTTON;
ui::MouseEvent rewritten_event(
ui::EventType::kMouseDragged, mouse_event->location(),
mouse_event->root_location(), mouse_event->time_stamp(), flags,
mouse_event->changed_button_flags(), mouse_event->pointer_details());
SetEventTarget(rewritten_event, event.target());
// SetNativeEvent must be called explicitly as native events are not copied on
// ChromeOS by default. This is because `PlatformEvent` is a pointer by
// default, so its lifetime can not be guaranteed in general. In this case,
// the lifetime of `rewritten_event` is guaranteed to be less than the
// original `mouse_event`.
SetNativeEvent(rewritten_event, mouse_event->native_event());
return SendEventFinally(continuation, &rewritten_event);
}
bool DragEventRewriter::SupportsNonRootLocation() const {
return true;
}
} // namespace ash
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