// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/controls/image_view_base.h"

#include <utility>

#include "base/i18n/rtl.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/views/accessibility/view_accessibility.h"

namespace views {

ImageViewBase::ImageViewBase() {
  GetViewAccessibility().SetRole(ax::mojom::Role::kImage);

  // The role of an object should not change over its lifetime. Therefore,
  // rather than changing the role to `kNone` when there is no presentable
  // information, set it to ignored. This will result in the same tree
  // inclusion/exclusion behavior without unexpected platform-specific
  // side effects related to the role changing.
  if (GetViewAccessibility().GetCachedName().empty() &&
      GetTooltipText().empty()) {
    GetViewAccessibility().SetIsIgnored(true);
  }
}

ImageViewBase::~ImageViewBase() = default;

void ImageViewBase::SetImageSize(const gfx::Size& image_size) {
  image_size_ = image_size;
  PreferredSizeChanged();
}

gfx::Rect ImageViewBase::GetImageBounds() const {
  return gfx::Rect(image_origin_, GetImageSize());
}

void ImageViewBase::ResetImageSize() {
  image_size_.reset();
  PreferredSizeChanged();
}

void ImageViewBase::SetHorizontalAlignment(Alignment alignment) {
  if (alignment != horizontal_alignment_) {
    horizontal_alignment_ = alignment;
    UpdateImageOrigin();
    OnPropertyChanged(&horizontal_alignment_, PropertyEffects::kPaint);
  }
}

ImageViewBase::Alignment ImageViewBase::GetHorizontalAlignment() const {
  return horizontal_alignment_;
}

void ImageViewBase::SetVerticalAlignment(Alignment alignment) {
  if (alignment != vertical_alignment_) {
    vertical_alignment_ = alignment;
    UpdateImageOrigin();
    OnPropertyChanged(&horizontal_alignment_, PropertyEffects::kPaint);
  }
}

ImageViewBase::Alignment ImageViewBase::GetVerticalAlignment() const {
  return vertical_alignment_;
}

void ImageViewBase::OnTooltipTextChanged(
    const std::u16string& old_tooltip_text) {
  View::OnTooltipTextChanged(old_tooltip_text);
  if (GetViewAccessibility().GetCachedName().empty() ||
      GetViewAccessibility().GetCachedName() == old_tooltip_text) {
    GetViewAccessibility().SetName(GetTooltipText());
  }
}

void ImageViewBase::AdjustAccessibleName(std::u16string& new_name,
                                         ax::mojom::NameFrom& name_from) {
  if (new_name.empty()) {
    new_name = GetTooltipText();
  }

  GetViewAccessibility().SetIsIgnored(new_name.empty());
}

gfx::Size ImageViewBase::CalculatePreferredSize(
    const SizeBounds& /*available_size*/) const {
  gfx::Size size = GetImageSize();
  size.Enlarge(GetInsets().width(), GetInsets().height());
  return size;
}

views::PaintInfo::ScaleType ImageViewBase::GetPaintScaleType() const {
  // ImageViewBase contains an image which is rastered at the device scale
  // factor. By default, the paint commands are recorded at a scale factor
  // slightly different from the device scale factor. Re-rastering the image at
  // this paint recording scale will result in a distorted image. Paint
  // recording scale might also not be uniform along the x & y axis, thus
  // resulting in further distortion in the aspect ratio of the final image.
  // |kUniformScaling| ensures that the paint recording scale is uniform along
  // the x & y axis and keeps the scale equal to the device scale factor.
  // See http://crbug.com/754010 for more details.
  return views::PaintInfo::ScaleType::kUniformScaling;
}

void ImageViewBase::OnBoundsChanged(const gfx::Rect& previous_bounds) {
  UpdateImageOrigin();
}

void ImageViewBase::UpdateImageOrigin() {
  gfx::Size image_size = GetImageSize();
  gfx::Insets insets = GetInsets();

  int x = 0;
  // In order to properly handle alignment of images in RTL locales, we need
  // to flip the meaning of trailing and leading. For example, if the
  // horizontal alignment is set to trailing, then we'll use left alignment for
  // the image instead of right alignment if the UI layout is RTL.
  Alignment actual_horizontal_alignment = horizontal_alignment_;
  if (base::i18n::IsRTL() && (horizontal_alignment_ != Alignment::kCenter)) {
    actual_horizontal_alignment = (horizontal_alignment_ == Alignment::kLeading)
                                      ? Alignment::kTrailing
                                      : Alignment::kLeading;
  }
  switch (actual_horizontal_alignment) {
    case Alignment::kLeading:
      x = insets.left();
      break;
    case Alignment::kTrailing:
      x = width() - insets.right() - image_size.width();
      break;
    case Alignment::kCenter:
      x = (width() - insets.width() - image_size.width()) / 2 + insets.left();
      break;
  }

  int y = 0;
  switch (vertical_alignment_) {
    case Alignment::kLeading:
      y = insets.top();
      break;
    case Alignment::kTrailing:
      y = height() - insets.bottom() - image_size.height();
      break;
    case Alignment::kCenter:
      y = (height() - insets.height() - image_size.height()) / 2 + insets.top();
      break;
  }

  image_origin_ = gfx::Point(x, y);
}

void ImageViewBase::PreferredSizeChanged() {
  View::PreferredSizeChanged();
  UpdateImageOrigin();
}

BEGIN_METADATA(ImageViewBase)
ADD_PROPERTY_METADATA(Alignment, HorizontalAlignment)
ADD_PROPERTY_METADATA(Alignment, VerticalAlignment)
END_METADATA

}  // namespace views

DEFINE_ENUM_CONVERTERS(views::ImageViewBase::Alignment,
                       {views::ImageViewBase::Alignment::kLeading, u"kLeading"},
                       {views::ImageViewBase::Alignment::kCenter, u"kCenter"},
                       {views::ImageViewBase::Alignment::kTrailing,
                        u"kTrailing"})