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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_SCROLL_CONTAINER_H_
#define CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_SCROLL_CONTAINER_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/scoped_observation.h"
#include "chrome/browser/ui/views/tabs/overflow_view.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/views/view.h"
#include "ui/views/view_observer.h"
namespace views {
class ImageButton;
}
class TabStrip;
class TabStripScrollingOverflowIndicatorStrategy;
// Allows the TabStrip to be scrolled back and forth when there are more tabs
// than can be displayed at one time. When the TabStrip is scrollable, displays
// buttons that control the scrolling.
class TabStripScrollContainer : public views::View, views::ViewObserver {
METADATA_HEADER(TabStripScrollContainer, views::View)
public:
explicit TabStripScrollContainer(std::unique_ptr<TabStrip> tab_strip);
TabStripScrollContainer(const TabStripScrollContainer&) = delete;
TabStripScrollContainer& operator=(const TabStripScrollContainer&) = delete;
~TabStripScrollContainer() override;
// views::ViewObserver:
void OnViewPreferredSizeChanged(View* view) override;
bool IsRectInWindowCaption(const gfx::Rect& rect);
void OnContentsScrolledCallback();
views::ImageButton* GetLeadingScrollButtonForTesting() {
return leading_scroll_button_;
}
views::ImageButton* GetTrailingScrollButtonForTesting() {
return trailing_scroll_button_;
}
// Update the background colors when frame active state changes.
void FrameColorsChanged();
private:
int GetTabStripAvailableWidth() const;
// Scrolls the tabstrip towards the first tab in the tabstrip.
void ScrollTowardsLeadingTab();
// Scrolls the tabstrip towards the last tab in the tabstrip.
void ScrollTowardsTrailingTab();
// enable or disable the scroll buttons based on the scroll position
void MaybeUpdateScrollButtonState();
TabStrip* tab_strip() { return tab_strip_observation_.GetSource(); }
// Subscription for scrolling of content view
base::CallbackListSubscription on_contents_scrolled_subscription_;
// views::View
void OnThemeChanged() override;
void AddedToWidget() override;
void RemovedFromWidget() override;
// Manages the visibility of the scroll buttons based on whether `tab_strip_`
// is currently overflowing.
raw_ptr<OverflowView> overflow_view_;
// Actually scrolls `tab_strip_`.
raw_ptr<views::ScrollView> scroll_view_;
base::ScopedObservation<TabStrip, views::ViewObserver> tab_strip_observation_{
this};
// The buttons that allow users to manually scroll `tab_strip_`.
raw_ptr<views::ImageButton> leading_scroll_button_;
raw_ptr<views::ImageButton> trailing_scroll_button_;
// The class handling the overflow indiciators for the scroll view.
std::unique_ptr<TabStripScrollingOverflowIndicatorStrategy>
overflow_indicator_strategy_;
base::CallbackListSubscription paint_as_active_subscription_;
};
#endif // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_SCROLL_CONTAINER_H_
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