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// Copyright 2017 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_NEW_TAB_BUTTON_H_
#define CHROME_BROWSER_UI_VIEWS_TABS_NEW_TAB_BUTTON_H_
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "build/build_config.h"
#include "chrome/browser/ui/views/tabs/tab_strip.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/views/controls/button/image_button.h"
#include "ui/views/view.h"
namespace views {
class InkDropContainerView;
}
///////////////////////////////////////////////////////////////////////////////
// NewTabButton
//
// A subclass of ImageButton that hit-tests to the shape of the new tab button
// and does custom drawing.
//
///////////////////////////////////////////////////////////////////////////////
class NewTabButton : public views::ImageButton,
public views::MaskedTargeterDelegate {
METADATA_HEADER(NewTabButton, views::ImageButton)
public:
static const gfx::Size kButtonSize;
static const int kIconSize;
NewTabButton(TabStrip* tab_strip, PressedCallback callback);
NewTabButton(const NewTabButton&) = delete;
NewTabButton& operator=(const NewTabButton&) = delete;
~NewTabButton() override;
// Called when the tab strip transitions to/from single tab mode, the frame
// state changes or the accent color changes. Updates the glyph colors for
// the best contrast on the background.
void FrameColorsChanged();
void AnimateToStateForTesting(views::InkDropState state);
// views::ImageButton:
void AddLayerToRegion(ui::Layer* new_layer,
views::LayerRegion region) override;
void RemoveLayerFromRegions(ui::Layer* old_layer) override;
protected:
virtual void PaintIcon(gfx::Canvas* canvas);
TabStrip* tab_strip() { return tab_strip_; }
SkColor GetForegroundColor() const;
// Returns the radius to use for the button corners.
virtual int GetCornerRadius() const;
// Returns the path for the given `origin`. If `extend_to_top` is
// true, the path is extended vertically to y = 0.
virtual SkPath GetBorderPath(const gfx::Point& origin,
bool extend_to_top) const;
// views::ImageButton:
void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
void AddedToWidget() override;
void RemovedFromWidget() override;
void OnThemeChanged() override;
private:
class HighlightPathGenerator;
// views::ImageButton:
#if BUILDFLAG(IS_WIN)
void OnMouseReleased(const ui::MouseEvent& event) override;
#endif
void OnGestureEvent(ui::GestureEvent* event) override;
void NotifyClick(const ui::Event& event) override;
void PaintButtonContents(gfx::Canvas* canvas) override;
gfx::Size CalculatePreferredSize(
const views::SizeBounds& available_size) const override;
// views::MaskedTargeterDelegate:
bool GetHitTestMask(SkPath* mask) const override;
// The NewTabButton consists of a foreground image on top of a background
// texture. First we paint the background with PaintFill. This is clipped to a
// circle to make the button appear circular. Then we paint the
// foreground image with PaintIcon.
//
// Paints the fill region of the button into `canvas`.
void PaintFill(gfx::Canvas* canvas) const;
// Tab strip that contains this button.
raw_ptr<TabStrip, AcrossTasksDanglingUntriaged> tab_strip_;
// Contains our ink drop layer so it can paint above our background.
raw_ptr<views::InkDropContainerView, DanglingUntriaged> ink_drop_container_;
base::CallbackListSubscription paint_as_active_subscription_;
// Stored ColorId values to differentiate for ChromeRefresh.
ui::ColorId foreground_frame_active_color_id_;
ui::ColorId foreground_frame_inactive_color_id_;
ui::ColorId background_frame_active_color_id_;
ui::ColorId background_frame_inactive_color_id_;
// For tracking whether this object has been destroyed. Must be last.
base::WeakPtrFactory<NewTabButton> weak_factory_{this};
};
#endif // CHROME_BROWSER_UI_VIEWS_TABS_NEW_TAB_BUTTON_H_
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