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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_CONTROLS_LINK_H_
#define UI_VIEWS_CONTROLS_LINK_H_
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include "base/functional/callback.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/color/color_variant.h"
#include "ui/gfx/color_palette.h"
#include "ui/views/controls/label.h"
#include "ui/views/metadata/view_factory.h"
#include "ui/views/style/typography.h"
namespace views {
////////////////////////////////////////////////////////////////////////////////
//
// Link class
//
// A Link is a label subclass that looks like an HTML link. It has a
// controller which is notified when a click occurs.
//
////////////////////////////////////////////////////////////////////////////////
class VIEWS_EXPORT Link : public Label {
METADATA_HEADER(Link, Label)
public:
// A callback to be called when the link is clicked. Closures are also
// accepted; see below.
using ClickedCallback = base::RepeatingCallback<void(const ui::Event& event)>;
explicit Link(const std::u16string& title = std::u16string(),
int text_context = style::CONTEXT_LABEL,
int text_style = style::STYLE_LINK);
Link(const Link&) = delete;
Link& operator=(const Link&) = delete;
~Link() override;
// Allow providing callbacks that expect either zero or one args, since many
// callers don't care about the argument and can avoid adapter functions this
// way.
void SetCallback(base::RepeatingClosure callback) {
// Adapt this closure to a ClickedCallback by discarding the extra arg.
callback_ =
base::BindRepeating([](base::RepeatingClosure closure,
const ui::Event& event) { closure.Run(); },
std::move(callback));
}
void SetCallback(ClickedCallback callback) {
callback_ = std::move(callback);
}
SkColor GetColor() const;
void SetForceUnderline(bool force_underline);
bool GetForceUnderline() const;
// Label:
ui::Cursor GetCursor(const ui::MouseEvent& event) override;
bool GetCanProcessEventsWithinSubtree() const override;
void OnMouseEntered(const ui::MouseEvent& event) override;
void OnMouseExited(const ui::MouseEvent& event) override;
bool OnMousePressed(const ui::MouseEvent& event) override;
bool OnMouseDragged(const ui::MouseEvent& event) override;
void OnMouseReleased(const ui::MouseEvent& event) override;
void OnMouseCaptureLost() override;
bool OnKeyPressed(const ui::KeyEvent& event) override;
void OnGestureEvent(ui::GestureEvent* event) override;
bool SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) override;
void OnFocus() override;
void OnBlur() override;
void SetFontList(const gfx::FontList& font_list) override;
void SetText(std::u16string_view text) override;
void OnThemeChanged() override;
void SetEnabledColor(ui::ColorVariant color) override;
bool IsSelectionSupported() const override;
private:
virtual void RecalculateFont();
void SetPressed(bool pressed);
void OnClick(const ui::Event& event);
void ConfigureFocus();
ClickedCallback callback_;
// Whether the link is currently pressed.
bool pressed_ = false;
// The color when the link is neither pressed nor disabled.
std::optional<SkColor> requested_enabled_color_;
base::CallbackListSubscription enabled_changed_subscription_;
// Whether the link text should use underline style regardless of enabled or
// focused state.
bool force_underline_ = true;
};
BEGIN_VIEW_BUILDER(VIEWS_EXPORT, Link, Label)
VIEW_BUILDER_OVERLOAD_METHOD(SetCallback, base::RepeatingClosure)
VIEW_BUILDER_OVERLOAD_METHOD(SetCallback, Link::ClickedCallback)
VIEW_BUILDER_PROPERTY(bool, ForceUnderline)
END_VIEW_BUILDER
} // namespace views
DEFINE_VIEW_BUILDER(VIEWS_EXPORT, Link)
#endif // UI_VIEWS_CONTROLS_LINK_H_
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