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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 <string>
#include <utility>
#include "base/callback.h"
#include "base/macros.h"
#include "base/optional.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/color_palette.h"
#include "ui/views/controls/label.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 {
public:
METADATA_HEADER(Link);
// A callback to be called when the link is clicked. Closures are also
// accepted; see below.
using ClickedCallback =
base::RepeatingCallback<void(Link* source, int event_flags)>;
// The padding for the focus ring border when rendering a focused Link with
// FocusStyle::kRing.
static constexpr gfx::Insets kFocusBorderPadding = gfx::Insets(1);
// How the Link is styled when focused.
enum class FocusStyle {
kUnderline, // An underline style is added to the text only when focused.
kRing, // A focus ring is drawn around the View.
};
explicit Link(const base::string16& title,
int text_context = style::CONTEXT_LABEL,
int text_style = style::STYLE_LINK);
~Link() override;
// Returns the current FocusStyle of this Link.
FocusStyle GetFocusStyle() const;
// Allow providing callbacks that expect either zero or two args, since many
// callers don't care about the arguments and can avoid adapter functions this
// way.
void set_callback(base::RepeatingClosure callback) {
// Adapt this closure to a ClickedCallback by discarding the extra args.
callback_ = base::BindRepeating(
[](base::RepeatingClosure closure, Link*, int) { closure.Run(); },
std::move(callback));
}
void set_callback(ClickedCallback callback) {
callback_ = std::move(callback);
}
SkColor GetColor() const;
// Label:
void PaintFocusRing(gfx::Canvas* canvas) const override;
gfx::Insets GetInsets() const override;
gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
bool CanProcessEventsWithinSubtree() const 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 GetAccessibleNodeData(ui::AXNodeData* node_data) override;
void OnFocus() override;
void OnBlur() override;
void SetFontList(const gfx::FontList& font_list) override;
void SetText(const base::string16& text) override;
void OnThemeChanged() override;
void SetEnabledColor(SkColor color) override;
bool IsSelectionSupported() const override;
bool GetUnderline() const;
// TODO(estade): almost all the places that call this pass false. With
// Harmony, false is already the default so those callsites can be removed.
// TODO(tapted): Then remove all callsites when client code sets a correct
// typography style and derives this from style::GetFont(STYLE_LINK).
void SetUnderline(bool underline);
private:
void SetPressed(bool pressed);
void RecalculateFont();
void ConfigureFocus();
ClickedCallback callback_;
// Whether the link should be underlined when enabled.
bool underline_ = false;
// Whether the link is currently pressed.
bool pressed_ = false;
// The color when the link is neither pressed nor disabled.
base::Optional<SkColor> requested_enabled_color_;
PropertyChangedSubscription enabled_changed_subscription_;
DISALLOW_COPY_AND_ASSIGN(Link);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_LINK_H_
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