cef/libcef/browser/views/button_impl.h

// Copyright 2016 The Chromium Embedded Framework 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 CEF_LIBCEF_BROWSER_VIEWS_BUTTON_IMPL_H_
#define CEF_LIBCEF_BROWSER_VIEWS_BUTTON_IMPL_H_
#pragma once

#include "base/logging.h"
#include "cef/include/views/cef_button.h"
#include "cef/include/views/cef_label_button.h"
#include "cef/libcef/browser/views/view_impl.h"
#include "ui/gfx/color_utils.h"
#include "ui/views/animation/ink_drop.h"
#include "ui/views/controls/button/button.h"

// Helpers for template boiler-plate.
#define CEF_BUTTON_IMPL_T CEF_VIEW_IMPL_T
#define CEF_BUTTON_IMPL_A CEF_VIEW_IMPL_A
#define CEF_BUTTON_IMPL_D CefButtonImpl<CEF_BUTTON_IMPL_A>

// Template for implementing CefButton-derived classes. See comments in
// view_impl.h for a usage overview.
CEF_BUTTON_IMPL_T class CefButtonImpl : public CEF_VIEW_IMPL_D {
 public:
  using ParentClass = CEF_VIEW_IMPL_D;

  // CefButton methods. When adding new As*() methods make sure to update
  // CefViewAdapter::GetFor() in view_adapter.cc.
  CefRefPtr<CefLabelButton> AsLabelButton() override { return nullptr; }
  void SetState(cef_button_state_t state) override;
  cef_button_state_t GetState() override;
  void SetInkDropEnabled(bool enabled) override;
  void SetTooltipText(const CefString& tooltip_text) override;
  void SetAccessibleName(const CefString& name) override;

  // CefView methods:
  CefRefPtr<CefButton> AsButton() override { return this; }
  void SetFocusable(bool focusable) override;

 protected:
  // Create a new implementation object.
  // Always call Initialize() after creation.
  // |delegate| may be nullptr.
  explicit CefButtonImpl(CefRefPtr<CefViewDelegateClass> delegate)
      : ParentClass(delegate) {}
};

CEF_BUTTON_IMPL_T void CEF_BUTTON_IMPL_D::SetState(cef_button_state_t state) {
  CEF_REQUIRE_VALID_RETURN_VOID();
  views::Button::ButtonState old_state = ParentClass::root_view()->GetState();
  views::Button::ButtonState new_state =
      static_cast<views::Button::ButtonState>(state);

  if (views::InkDrop::Get(ParentClass::root_view())->ink_drop_mode() !=
          views::InkDropHost::InkDropMode::OFF &&
      !ParentClass::root_view()->IsFocusable()) {
    // Ink drop state does not get set properly on state change when the button
    // is non-focusable.
    views::InkDropState ink_state = views::InkDropState::HIDDEN;
    if (new_state == views::Button::STATE_PRESSED) {
      ink_state = views::InkDropState::ACTIVATED;
    } else if (old_state == views::Button::STATE_PRESSED) {
      ink_state = views::InkDropState::DEACTIVATED;
    }
    views::InkDrop::Get(ParentClass::root_view())
        ->AnimateToState(ink_state, nullptr);
  }

  ParentClass::root_view()->SetState(new_state);
}

CEF_BUTTON_IMPL_T cef_button_state_t CEF_BUTTON_IMPL_D::GetState() {
  CEF_REQUIRE_VALID_RETURN(CEF_BUTTON_STATE_NORMAL);
  return static_cast<cef_button_state_t>(ParentClass::root_view()->GetState());
}

CEF_BUTTON_IMPL_T void CEF_BUTTON_IMPL_D::SetInkDropEnabled(bool enabled) {
  CEF_REQUIRE_VALID_RETURN_VOID();
  auto* inkdrop = views::InkDrop::Get(ParentClass::root_view());
  inkdrop->SetMode(enabled ? views::InkDropHost::InkDropMode::ON
                           : views::InkDropHost::InkDropMode::OFF);
  if (enabled) {
    // Never returns an empty value.
    const auto& color = view_util::GetBackgroundColor(
        ParentClass::root_view(), /*allow_transparent=*/false);
    inkdrop->SetBaseColor(color_utils::BlendTowardMaxContrast(*color, 0x61));
  }
}

CEF_BUTTON_IMPL_T void CEF_BUTTON_IMPL_D::SetTooltipText(
    const CefString& tooltip_text) {
  CEF_REQUIRE_VALID_RETURN_VOID();
  ParentClass::root_view()->SetTooltipText(tooltip_text);
}

CEF_BUTTON_IMPL_T void CEF_BUTTON_IMPL_D::SetAccessibleName(
    const CefString& name) {
  CEF_REQUIRE_VALID_RETURN_VOID();
  ParentClass::root_view()->SetAccessibleName(name);
}

CEF_BUTTON_IMPL_T void CEF_BUTTON_IMPL_D::SetFocusable(bool focusable) {
  CEF_REQUIRE_VALID_RETURN_VOID();
  ParentClass::root_view()->SetRequestFocusOnPress(focusable);
  ParentClass::SetFocusable(focusable);
}

#endif  // CEF_LIBCEF_BROWSER_VIEWS_BUTTON_IMPL_H_