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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/actor/scroll_tool.h"
#include <optional>
#include "base/notimplemented.h"
#include "base/strings/to_string.h"
#include "base/time/time.h"
#include "chrome/common/actor/action_result.h"
#include "chrome/common/actor/actor_logging.h"
#include "chrome/renderer/actor/tool_utils.h"
#include "content/public/renderer/render_frame.h"
#include "third_party/abseil-cpp/absl/strings/str_format.h"
#include "third_party/blink/public/web/web_element.h"
#include "third_party/blink/public/web/web_frame_widget.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/public/web/web_node.h"
#include "ui/events/base_event_utils.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace actor {
using ::blink::WebElement;
using ::blink::WebLocalFrame;
using ::blink::WebNode;
ScrollTool::ScrollTool(mojom::ScrollActionPtr action,
content::RenderFrame& frame)
: frame_(frame), action_(std::move(action)) {}
ScrollTool::~ScrollTool() = default;
void ScrollTool::Execute(ToolFinishedCallback callback) {
ValidatedResult validated_result = Validate();
if (!validated_result.has_value()) {
std::move(callback).Run(std::move(validated_result.error()));
return;
}
WebElement scrolling_element = validated_result->scroller;
gfx::Vector2dF offset_physical = validated_result->scroll_by_offset;
float physical_to_css = 1 / scrolling_element.GetEffectiveZoom();
gfx::Vector2dF offset_css =
gfx::ScaleVector2d(offset_physical, physical_to_css, physical_to_css);
gfx::Vector2dF start_offset_css = scrolling_element.GetScrollOffset();
scrolling_element.SetScrollOffset(start_offset_css + offset_css);
bool did_scroll = scrolling_element.GetScrollOffset() != start_offset_css;
std::move(callback).Run(
did_scroll
? MakeOkResult()
: MakeResult(mojom::ActionResultCode::kScrollOffsetDidNotChange));
}
std::string ScrollTool::DebugString() const {
return absl::StrFormat("ScrollTool[%s;direction(%s);distance(%f)]",
ToDebugString(action_->target),
base::ToString(action_->direction), action_->distance);
}
ScrollTool::ValidatedResult ScrollTool::Validate() const {
// The scroll distance should always be positive.
if (action_->distance <= 0.0) {
return base::unexpected(MakeResult(
mojom::ActionResultCode::kArgumentsInvalid, "Negative Distance"));
}
WebLocalFrame* web_frame = frame_->GetWebFrame();
if (!web_frame || !web_frame->FrameWidget()) {
return base::unexpected(
MakeResult(mojom::ActionResultCode::kFrameWentAway));
}
WebElement scrolling_element;
if (!action_->target) {
scrolling_element = web_frame->GetDocument().ScrollingElement();
if (scrolling_element.IsNull()) {
return base::unexpected(
MakeResult(mojom::ActionResultCode::kScrollNoScrollingElement));
}
} else {
if (action_->target->is_coordinate()) {
NOTIMPLEMENTED() << "Coordinate-based target not yet supported.";
return base::unexpected(MakeErrorResult());
}
int32_t dom_node_id = action_->target->get_dom_node_id();
scrolling_element =
GetNodeFromId(frame_.get(), dom_node_id).DynamicTo<WebElement>();
if (scrolling_element.IsNull()) {
return base::unexpected(
MakeResult(mojom::ActionResultCode::kInvalidDomNodeId));
}
}
gfx::Vector2dF offset_physical;
switch (action_->direction) {
case mojom::ScrollAction::ScrollDirection::kLeft: {
offset_physical.set_x(-action_->distance);
break;
}
case mojom::ScrollAction::ScrollDirection::kRight: {
offset_physical.set_x(action_->distance);
break;
}
case mojom::ScrollAction::ScrollDirection::kUp: {
offset_physical.set_y(-action_->distance);
break;
}
case mojom::ScrollAction::ScrollDirection::kDown: {
offset_physical.set_y(action_->distance);
break;
}
}
if ((offset_physical.x() && !scrolling_element.IsUserScrollableX()) ||
(offset_physical.y() && !scrolling_element.IsUserScrollableY())) {
return base::unexpected(
MakeResult(mojom::ActionResultCode::kScrollTargetNotUserScrollable,
absl::StrFormat("ScrollingElement [%s]",
base::ToString(scrolling_element))));
}
return ScrollerAndDistance{scrolling_element, offset_physical};
}
} // namespace actor
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