// 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.

#include "chrome/browser/ui/views/detachable_toolbar_view.h"

#include "chrome/browser/themes/theme_properties.h"
#include "grit/theme_resources.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/theme_provider.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/skia_util.h"
#include "ui/views/window/non_client_view.h"

// How round the 'new tab' style bookmarks bar is.
static const int kNewtabBarRoundness = 5;

const SkColor DetachableToolbarView::kEdgeDividerColor =
    SkColorSetRGB(222, 234, 248);
const SkColor DetachableToolbarView::kMiddleDividerColor =
    SkColorSetRGB(194, 205, 212);

// static
void DetachableToolbarView::PaintBackgroundAttachedMode(
    gfx::Canvas* canvas,
    ui::ThemeProvider* theme_provider,
    const gfx::Rect& bounds,
    const gfx::Point& background_origin,
    chrome::HostDesktopType host_desktop_type) {
  canvas->FillRect(bounds,
                   theme_provider->GetColor(ThemeProperties::COLOR_TOOLBAR));
  canvas->TileImageInt(*theme_provider->GetImageSkiaNamed(IDR_THEME_TOOLBAR),
                       background_origin.x(), background_origin.y(), bounds.x(),
                       bounds.y(), bounds.width(), bounds.height());

  if (host_desktop_type == chrome::HOST_DESKTOP_TYPE_ASH) {
    // Ash provides additional lightening at the edges of the toolbar.
    gfx::ImageSkia* toolbar_left =
        theme_provider->GetImageSkiaNamed(IDR_TOOLBAR_SHADE_LEFT);
    canvas->TileImageInt(*toolbar_left,
                         bounds.x(), bounds.y(),
                         toolbar_left->width(), bounds.height());
    gfx::ImageSkia* toolbar_right =
        theme_provider->GetImageSkiaNamed(IDR_TOOLBAR_SHADE_RIGHT);
    canvas->TileImageInt(*toolbar_right,
                         bounds.right() - toolbar_right->width(), bounds.y(),
                         toolbar_right->width(), bounds.height());
  }
}

// static
void DetachableToolbarView::CalculateContentArea(
    double animation_state, double horizontal_padding,
    double vertical_padding, SkRect* rect,
    double* roundness, views::View* view) {
  // The 0.5 is to correct for Skia's "draw on pixel boundaries"ness.
  rect->set(SkDoubleToScalar(horizontal_padding - 0.5),
           SkDoubleToScalar(vertical_padding - 0.5),
           SkDoubleToScalar(view->width() - horizontal_padding - 0.5),
           SkDoubleToScalar(view->height() - vertical_padding - 0.5));

  *roundness = static_cast<double>(kNewtabBarRoundness) * animation_state;
}

// static
void DetachableToolbarView::PaintHorizontalBorder(
    gfx::Canvas* canvas,
    DetachableToolbarView* view,
    bool at_top,
    SkColor color) {
  int thickness = views::NonClientFrameView::kClientEdgeThickness;
  int y = at_top ? 0 : (view->height() - thickness);
  canvas->FillRect(gfx::Rect(0, y, view->width(), thickness), color);
}

// static
void DetachableToolbarView::PaintContentAreaBackground(
    gfx::Canvas* canvas,
    ui::ThemeProvider* theme_provider,
    const SkRect& rect,
    double roundness) {
  SkPaint paint;
  paint.setAntiAlias(true);
  paint.setColor(theme_provider->GetColor(ThemeProperties::COLOR_TOOLBAR));

  canvas->sk_canvas()->drawRoundRect(
      rect, SkDoubleToScalar(roundness), SkDoubleToScalar(roundness), paint);
}

// static
void DetachableToolbarView::PaintContentAreaBorder(
    gfx::Canvas* canvas, ui::ThemeProvider* theme_provider,
    const SkRect& rect, double roundness) {
  SkPaint border_paint;
  border_paint.setColor(
      theme_provider->GetColor(ThemeProperties::COLOR_NTP_HEADER));
  border_paint.setStyle(SkPaint::kStroke_Style);
  border_paint.setAlpha(96);
  border_paint.setAntiAlias(true);

  canvas->sk_canvas()->drawRoundRect(
      rect, SkDoubleToScalar(roundness), SkDoubleToScalar(roundness),
      border_paint);
}

// static
void DetachableToolbarView::PaintVerticalDivider(gfx::Canvas* canvas,
                                                 int x,
                                                 int height,
                                                 int vertical_padding,
                                                 SkColor top_color,
                                                 SkColor middle_color,
                                                 SkColor bottom_color) {
  // Draw the upper half of the divider.
  SkPaint paint;
  skia::RefPtr<SkShader> shader = gfx::CreateGradientShader(
      vertical_padding + 1, height / 2, top_color, middle_color);
  paint.setShader(shader.get());
  SkRect rc = { SkIntToScalar(x),
                SkIntToScalar(vertical_padding + 1),
                SkIntToScalar(x + 1),
                SkIntToScalar(height / 2) };
  canvas->sk_canvas()->drawRect(rc, paint);

  // Draw the lower half of the divider.
  SkPaint paint_down;
  shader = gfx::CreateGradientShader(
      height / 2, height - vertical_padding, middle_color, bottom_color);
  paint_down.setShader(shader.get());
  SkRect rc_down = { SkIntToScalar(x),
                     SkIntToScalar(height / 2),
                     SkIntToScalar(x + 1),
                     SkIntToScalar(height - vertical_padding) };
  canvas->sk_canvas()->drawRect(rc_down, paint_down);
}