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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/browser/ui/views/frame/multi_contents_view_drop_target_controller.h"
#include "base/check_deref.h"
#include "base/functional/callback_forward.h"
#include "base/i18n/rtl.h"
#include "base/memory/raw_ref.h"
#include "base/task/single_thread_task_runner.h"
#include "chrome/browser/ui/ui_features.h"
#include "chrome/browser/ui/views/frame/multi_contents_drop_target_view.h"
#include "content/public/common/drop_data.h"
#include "ui/views/view_class_properties.h"
MultiContentsViewDropTargetController::MultiContentsViewDropTargetController(
MultiContentsDropTargetView& drop_target_view)
: drop_target_view_(drop_target_view),
drop_target_parent_view_(CHECK_DEREF(drop_target_view.parent())) {}
MultiContentsViewDropTargetController::
~MultiContentsViewDropTargetController() = default;
MultiContentsViewDropTargetController::DropTargetShowTimer::DropTargetShowTimer(
MultiContentsDropTargetView::DropSide drop_side)
: drop_side(drop_side) {}
void MultiContentsViewDropTargetController::OnWebContentsDragUpdate(
const content::DropData& data,
const gfx::PointF& point,
bool is_in_split_view) {
CHECK_LE(point.x(), drop_target_parent_view_->width());
if (!data.url.is_valid() || is_in_split_view) {
ResetDropTargetTimer();
return;
}
const int drop_entry_point_width =
drop_target_view_->GetPreferredSize().width();
const bool is_rtl = base::i18n::IsRTL();
if (point.x() >= drop_target_parent_view_->width() - drop_entry_point_width) {
StartOrUpdateDropTargetTimer(
is_rtl ? MultiContentsDropTargetView::DropSide::START
: MultiContentsDropTargetView::DropSide::END);
} else if (point.x() <= drop_entry_point_width) {
StartOrUpdateDropTargetTimer(
is_rtl ? MultiContentsDropTargetView::DropSide::END
: MultiContentsDropTargetView::DropSide::START);
} else {
ResetDropTargetTimer();
}
}
void MultiContentsViewDropTargetController::OnWebContentsDragExit() {
ResetDropTargetTimer();
}
void MultiContentsViewDropTargetController::StartOrUpdateDropTargetTimer(
MultiContentsDropTargetView::DropSide drop_side) {
if (drop_target_view_->GetVisible()) {
return;
}
if (show_drop_target_timer_.has_value()) {
CHECK(show_drop_target_timer_->timer.IsRunning());
show_drop_target_timer_->drop_side = drop_side;
return;
}
show_drop_target_timer_.emplace(drop_side);
show_drop_target_timer_->timer.Start(
FROM_HERE, features::kSideBySideShowDropTargetDelay.Get(), this,
&MultiContentsViewDropTargetController::ShowTimerDelayedDropTarget);
}
void MultiContentsViewDropTargetController::ResetDropTargetTimer() {
show_drop_target_timer_.reset();
}
void MultiContentsViewDropTargetController::ShowTimerDelayedDropTarget() {
CHECK(show_drop_target_timer_.has_value());
CHECK(!drop_target_view_->GetVisible());
drop_target_view_->Show(show_drop_target_timer_->drop_side);
show_drop_target_timer_.reset();
}
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