// Copyright (c) 2010 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 "views/box_layout.h"

namespace views {

BoxLayout::BoxLayout(BoxLayout::Orientation orientation,
                     int inside_border_horizontal_spacing,
                     int inside_border_vertical_spacing,
                     int between_child_spacing)
    : orientation_(orientation),
      inside_border_horizontal_spacing_(inside_border_horizontal_spacing),
      inside_border_vertical_spacing_(inside_border_vertical_spacing),
      between_child_spacing_(between_child_spacing) {
}

void BoxLayout::Layout(View* host) {
  gfx::Rect childArea(gfx::Rect(host->size()));
  childArea.Inset(host->GetInsets());
  childArea.Inset(inside_border_horizontal_spacing_,
                  inside_border_vertical_spacing_);
  int x = childArea.x();
  int y = childArea.y();
  for (int i = 0; i < host->GetChildViewCount(); ++i) {
    View* child = host->GetChildViewAt(i);
    if (child->IsVisible()) {
      gfx::Rect bounds(x, y, childArea.width(), childArea.height());
      gfx::Size size(child->GetPreferredSize());
      if (orientation_ == kHorizontal) {
        bounds.set_width(size.width());
        x += size.width() + between_child_spacing_;
      } else {
        bounds.set_height(size.height());
        y += size.height() + between_child_spacing_;
      }
      // Clamp child view bounds to |childArea|.
      child->SetBounds(bounds.Intersect(childArea));
    }
  }
}

gfx::Size BoxLayout::GetPreferredSize(View* host) {
  gfx::Rect bounds;
  int position = 0;
  for (int i = 0; i < host->GetChildViewCount(); ++i) {
    View* child = host->GetChildViewAt(i);
    if (child->IsVisible()) {
      gfx::Size size(child->GetPreferredSize());
      if (orientation_ == kHorizontal) {
        gfx::Rect child_bounds(position, 0, size.width(), size.height());
        bounds = bounds.Union(child_bounds);
        position += size.width();
      } else {
        gfx::Rect child_bounds(0, position, size.width(), size.height());
        bounds = bounds.Union(child_bounds);
        position += size.height();
      }
      position += between_child_spacing_;
    }
  }
  gfx::Insets insets(host->GetInsets());
  return gfx::Size(
      bounds.width() + insets.width() + 2 * inside_border_horizontal_spacing_,
      bounds.height() + insets.height() + 2 * inside_border_vertical_spacing_);
}

} // namespace views