// Copyright 2014 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.

#include "content/child/webthemeengine_impl_default.h"

#include "build/build_config.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "ui/native_theme/native_theme.h"

using blink::WebCanvas;
using blink::WebColor;
using blink::WebRect;
using blink::WebThemeEngine;

namespace content {
namespace {

#if defined(OS_WIN)
// The scrollbar metrics default to 17 dips which is the default value on
// Windows in most cases.
int32_t g_vertical_scroll_bar_width = 17;

// The height of a horizontal scroll bar in dips.
int32_t g_horizontal_scroll_bar_height = 17;

// The height of the arrow bitmap on a vertical scroll bar in dips.
int32_t g_vertical_arrow_bitmap_height = 17;

// The width of the arrow bitmap on a horizontal scroll bar in dips.
int32_t g_horizontal_arrow_bitmap_width = 17;
#endif

}  // namespace

static ui::NativeTheme::Part NativeThemePart(
    WebThemeEngine::Part part) {
  switch (part) {
    case WebThemeEngine::PartScrollbarDownArrow:
      return ui::NativeTheme::kScrollbarDownArrow;
    case WebThemeEngine::PartScrollbarLeftArrow:
      return ui::NativeTheme::kScrollbarLeftArrow;
    case WebThemeEngine::PartScrollbarRightArrow:
      return ui::NativeTheme::kScrollbarRightArrow;
    case WebThemeEngine::PartScrollbarUpArrow:
      return ui::NativeTheme::kScrollbarUpArrow;
    case WebThemeEngine::PartScrollbarHorizontalThumb:
      return ui::NativeTheme::kScrollbarHorizontalThumb;
    case WebThemeEngine::PartScrollbarVerticalThumb:
      return ui::NativeTheme::kScrollbarVerticalThumb;
    case WebThemeEngine::PartScrollbarHorizontalTrack:
      return ui::NativeTheme::kScrollbarHorizontalTrack;
    case WebThemeEngine::PartScrollbarVerticalTrack:
      return ui::NativeTheme::kScrollbarVerticalTrack;
    case WebThemeEngine::PartScrollbarCorner:
      return ui::NativeTheme::kScrollbarCorner;
    case WebThemeEngine::PartCheckbox:
      return ui::NativeTheme::kCheckbox;
    case WebThemeEngine::PartRadio:
      return ui::NativeTheme::kRadio;
    case WebThemeEngine::PartButton:
      return ui::NativeTheme::kPushButton;
    case WebThemeEngine::PartTextField:
      return ui::NativeTheme::kTextField;
    case WebThemeEngine::PartMenuList:
      return ui::NativeTheme::kMenuList;
    case WebThemeEngine::PartSliderTrack:
      return ui::NativeTheme::kSliderTrack;
    case WebThemeEngine::PartSliderThumb:
      return ui::NativeTheme::kSliderThumb;
    case WebThemeEngine::PartInnerSpinButton:
      return ui::NativeTheme::kInnerSpinButton;
    case WebThemeEngine::PartProgressBar:
      return ui::NativeTheme::kProgressBar;
    default:
      return ui::NativeTheme::kScrollbarDownArrow;
  }
}

static ui::NativeTheme::State NativeThemeState(
    WebThemeEngine::State state) {
  switch (state) {
    case WebThemeEngine::StateDisabled:
      return ui::NativeTheme::kDisabled;
    case WebThemeEngine::StateHover:
      return ui::NativeTheme::kHovered;
    case WebThemeEngine::StateNormal:
      return ui::NativeTheme::kNormal;
    case WebThemeEngine::StatePressed:
      return ui::NativeTheme::kPressed;
    default:
      return ui::NativeTheme::kDisabled;
  }
}

static void GetNativeThemeExtraParams(
    WebThemeEngine::Part part,
    WebThemeEngine::State state,
    const WebThemeEngine::ExtraParams* extra_params,
    ui::NativeTheme::ExtraParams* native_theme_extra_params) {
  switch (part) {
    case WebThemeEngine::PartScrollbarHorizontalTrack:
    case WebThemeEngine::PartScrollbarVerticalTrack:
      native_theme_extra_params->scrollbar_track.track_x =
          extra_params->scrollbarTrack.trackX;
      native_theme_extra_params->scrollbar_track.track_y =
          extra_params->scrollbarTrack.trackY;
      native_theme_extra_params->scrollbar_track.track_width =
          extra_params->scrollbarTrack.trackWidth;
      native_theme_extra_params->scrollbar_track.track_height =
          extra_params->scrollbarTrack.trackHeight;
      break;
    case WebThemeEngine::PartCheckbox:
      native_theme_extra_params->button.checked = extra_params->button.checked;
      native_theme_extra_params->button.indeterminate =
          extra_params->button.indeterminate;
      break;
    case WebThemeEngine::PartRadio:
      native_theme_extra_params->button.checked = extra_params->button.checked;
      break;
    case WebThemeEngine::PartButton:
      native_theme_extra_params->button.is_default =
          extra_params->button.isDefault;
      native_theme_extra_params->button.has_border =
          extra_params->button.hasBorder;
      // Native buttons have a different focus style.
      native_theme_extra_params->button.is_focused = false;
      native_theme_extra_params->button.background_color =
          extra_params->button.backgroundColor;
      break;
    case WebThemeEngine::PartTextField:
      native_theme_extra_params->text_field.is_text_area =
          extra_params->textField.isTextArea;
      native_theme_extra_params->text_field.is_listbox =
          extra_params->textField.isListbox;
      native_theme_extra_params->text_field.background_color =
          extra_params->textField.backgroundColor;
      break;
    case WebThemeEngine::PartMenuList:
      native_theme_extra_params->menu_list.has_border =
          extra_params->menuList.hasBorder;
      native_theme_extra_params->menu_list.has_border_radius =
          extra_params->menuList.hasBorderRadius;
      native_theme_extra_params->menu_list.arrow_x =
          extra_params->menuList.arrowX;
      native_theme_extra_params->menu_list.arrow_y =
          extra_params->menuList.arrowY;
      native_theme_extra_params->menu_list.arrow_size =
          extra_params->menuList.arrowSize;
      native_theme_extra_params->menu_list.arrow_color =
          extra_params->menuList.arrowColor;
      native_theme_extra_params->menu_list.background_color =
          extra_params->menuList.backgroundColor;
      break;
    case WebThemeEngine::PartSliderTrack:
    case WebThemeEngine::PartSliderThumb:
      native_theme_extra_params->slider.vertical =
          extra_params->slider.vertical;
      native_theme_extra_params->slider.in_drag = extra_params->slider.inDrag;
      break;
    case WebThemeEngine::PartInnerSpinButton:
      native_theme_extra_params->inner_spin.spin_up =
          extra_params->innerSpin.spinUp;
      native_theme_extra_params->inner_spin.read_only =
          extra_params->innerSpin.readOnly;
      break;
    case WebThemeEngine::PartProgressBar:
      native_theme_extra_params->progress_bar.determinate =
          extra_params->progressBar.determinate;
      native_theme_extra_params->progress_bar.value_rect_x =
          extra_params->progressBar.valueRectX;
      native_theme_extra_params->progress_bar.value_rect_y =
          extra_params->progressBar.valueRectY;
      native_theme_extra_params->progress_bar.value_rect_width =
          extra_params->progressBar.valueRectWidth;
      native_theme_extra_params->progress_bar.value_rect_height =
          extra_params->progressBar.valueRectHeight;
      break;
    default:
      break;  // Parts that have no extra params get here.
  }
}

blink::WebSize WebThemeEngineImpl::getSize(WebThemeEngine::Part part) {
  ui::NativeTheme::ExtraParams extra;
  ui::NativeTheme::Part native_theme_part = NativeThemePart(part);
#if defined(OS_WIN)
  switch (native_theme_part) {
    case ui::NativeTheme::kScrollbarDownArrow:
    case ui::NativeTheme::kScrollbarLeftArrow:
    case ui::NativeTheme::kScrollbarRightArrow:
    case ui::NativeTheme::kScrollbarUpArrow:
    case ui::NativeTheme::kScrollbarHorizontalThumb:
    case ui::NativeTheme::kScrollbarVerticalThumb:
    case ui::NativeTheme::kScrollbarHorizontalTrack:
    case ui::NativeTheme::kScrollbarVerticalTrack: {
      return gfx::Size(g_vertical_scroll_bar_width,
                       g_vertical_scroll_bar_width);
    }

    default:
      break;
  }
#endif
  return ui::NativeTheme::GetInstanceForWeb()->GetPartSize(
      native_theme_part, ui::NativeTheme::kNormal, extra);
}

void WebThemeEngineImpl::paint(
    blink::WebCanvas* canvas,
    WebThemeEngine::Part part,
    WebThemeEngine::State state,
    const blink::WebRect& rect,
    const WebThemeEngine::ExtraParams* extra_params) {
  ui::NativeTheme::ExtraParams native_theme_extra_params;
  GetNativeThemeExtraParams(
      part, state, extra_params, &native_theme_extra_params);
  ui::NativeTheme::GetInstanceForWeb()->Paint(
      canvas, NativeThemePart(part), NativeThemeState(state), gfx::Rect(rect),
      native_theme_extra_params);
}

void WebThemeEngineImpl::paintStateTransition(blink::WebCanvas* canvas,
                                              WebThemeEngine::Part part,
                                              WebThemeEngine::State startState,
                                              WebThemeEngine::State endState,
                                              double progress,
                                              const blink::WebRect& rect) {
  ui::NativeTheme::GetInstanceForWeb()->PaintStateTransition(
      canvas, NativeThemePart(part), NativeThemeState(startState),
      NativeThemeState(endState), progress, gfx::Rect(rect));
}

#if defined(OS_WIN)
// static
void WebThemeEngineImpl::cacheScrollBarMetrics(
    int32_t vertical_scroll_bar_width,
    int32_t horizontal_scroll_bar_height,
    int32_t vertical_arrow_bitmap_height,
    int32_t horizontal_arrow_bitmap_width) {
  g_vertical_scroll_bar_width = vertical_scroll_bar_width;
  g_horizontal_scroll_bar_height = horizontal_scroll_bar_height;
  g_vertical_arrow_bitmap_height = vertical_arrow_bitmap_height;
  g_horizontal_arrow_bitmap_width = horizontal_arrow_bitmap_width;
}
#endif

}  // namespace content