// Copyright 2012 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/window/non_client_view.h"

#include <memory>
#include <utility>
#include <vector>

#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/base/hit_test.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/views/layout/fill_layout.h"
#include "ui/views/rect_based_targeting_utils.h"
#include "ui/views/view_targeter.h"
#include "ui/views/widget/root_view.h"
#include "ui/views/widget/widget.h"
#include "ui/views/window/client_view.h"
#include "ui/views/window/frame_view.h"

namespace views {

NonClientView::NonClientView(views::ClientView* client_view)
    : client_view_(client_view) {
  SetEventTargeter(std::make_unique<views::ViewTargeter>(this));

  // TODO(crbug.com/40866857): Should this be pruned from the accessibility
  // tree?
  GetViewAccessibility().SetRole(ax::mojom::Role::kClient);
}

NonClientView::~NonClientView() {
  // This value may have been reset before the window hierarchy shuts down,
  // so we need to manually remove it.
  RemoveChildView(frame_view_.get());
}

void NonClientView::SetFrameView(std::unique_ptr<FrameView> frame_view) {
  // If there is an existing frame view, ensure that the ClientView remains
  // attached to the Widget by moving the ClientView to the new frame before
  // removing the old frame from the view hierarchy.
  std::unique_ptr<FrameView> old_frame_view = std::move(frame_view_);
  frame_view_ = std::move(frame_view);
  if (parent()) {
    AddChildViewAt(frame_view_.get(), 0);
    frame_view_->InsertClientView(client_view_);
  }

  if (old_frame_view) {
    RemoveChildView(old_frame_view.get());
  }
}

void NonClientView::SetOverlayView(View* view) {
  if (overlay_view_) {
    RemoveChildView(overlay_view_);
  }

  if (!view) {
    return;
  }

  overlay_view_ = view;
  if (parent()) {
    AddChildViewRaw(overlay_view_.get());
  }
}

CloseRequestResult NonClientView::OnWindowCloseRequested() {
  return client_view_->OnWindowCloseRequested();
}

void NonClientView::WindowClosing() {
  client_view_->WidgetClosing();
}

void NonClientView::UpdateFrame() {
  Widget* widget = GetWidget();
  SetFrameView(widget->CreateFrameView());
  widget->ThemeChanged();
  InvalidateLayout();
  SchedulePaint();
}

gfx::Rect NonClientView::GetWindowBoundsForClientBounds(
    const gfx::Rect client_bounds) const {
  return frame_view_->GetWindowBoundsForClientBounds(client_bounds);
}

int NonClientView::NonClientHitTest(const gfx::Point& point) {
  // The FrameView is responsible for also asking the ClientView.
  return frame_view_->NonClientHitTest(point);
}

void NonClientView::GetWindowMask(const gfx::Size& size, SkPath* window_mask) {
  frame_view_->GetWindowMask(size, window_mask);
}

void NonClientView::ResetWindowControls() {
  frame_view_->ResetWindowControls();
}

void NonClientView::UpdateWindowIcon() {
  frame_view_->UpdateWindowIcon();
}

void NonClientView::UpdateWindowTitle() {
  frame_view_->UpdateWindowTitle();
}

void NonClientView::SizeConstraintsChanged() {
  frame_view_->SizeConstraintsChanged();
}

bool NonClientView::HasWindowTitle() const {
  return frame_view_->HasWindowTitle();
}

bool NonClientView::IsWindowTitleVisible() const {
  return frame_view_->IsWindowTitleVisible();
}

gfx::Size NonClientView::CalculatePreferredSize(
    const SizeBounds& available_size) const {
  // TODO(pkasting): This should probably be made to look similar to
  // GetMinimumSize() below.  This will require implementing GetPreferredSize()
  // better in the various frame views.
  gfx::Rect client_bounds(gfx::Point(),
                          client_view_->GetPreferredSize(available_size));
  return GetWindowBoundsForClientBounds(client_bounds).size();
}

gfx::Size NonClientView::GetMinimumSize() const {
  return frame_view_->GetMinimumSize();
}

gfx::Size NonClientView::GetMaximumSize() const {
  return frame_view_->GetMaximumSize();
}

void NonClientView::Layout(PassKey) {
  // TODO(pkasting): The frame view should have the client view as a child and
  // lay it out directly + set its clip path.  Done correctly, this should let
  // us use a FillLayout on this class that holds |frame_view_| and
  // |overlay_view_|, and eliminate CalculatePreferredSize()/GetMinimumSize()/
  // GetMaximumSize()/Layout().  The frame view and client view were originally
  // siblings because "many Views make the assumption they are only inserted
  // into a View hierarchy once" ( http://codereview.chromium.org/27317 ), but
  // where that is still the case it should simply be fixed.
  frame_view_->SetBoundsRect(GetLocalBounds());

  if (overlay_view_) {
    overlay_view_->SetBoundsRect(GetLocalBounds());
  }
}

View* NonClientView::GetTooltipHandlerForPoint(const gfx::Point& point) {
  // The same logic as for TargetForRect() applies here.
  if (frame_view_->parent() == this) {
    // During the reset of the frame_view_ it's possible to be in this code
    // after it's been removed from the view hierarchy but before it's been
    // removed from the NonClientView.
    gfx::Point point_in_child_coords(point);
    View::ConvertPointToTarget(this, frame_view_.get(), &point_in_child_coords);
    View* handler =
        frame_view_->GetTooltipHandlerForPoint(point_in_child_coords);
    if (handler) {
      return handler;
    }
  }

  return View::GetTooltipHandlerForPoint(point);
}

void NonClientView::ViewHierarchyChanged(
    const ViewHierarchyChangedDetails& details) {
  // Add our child views here as we are added to the Widget so that if we are
  // subsequently resized all the parent-child relationships are established.
  // TODO(pkasting): The above comment makes no sense to me.  Try to eliminate
  // the various setters, and create and add children directly in the
  // constructor.
  if (details.is_add && GetWidget() && details.child == this) {
    AddChildViewAt(frame_view_.get(), 0);
    frame_view_->InsertClientView(client_view_);
    if (overlay_view_) {
      AddChildViewRaw(overlay_view_.get());
    }
  }
}

View* NonClientView::TargetForRect(View* root, const gfx::Rect& rect) {
  CHECK_EQ(root, this);

  if (!UsePointBasedTargeting(rect)) {
    return ViewTargeterDelegate::TargetForRect(root, rect);
  }

  // Because of the z-ordering of our child views (the client view is positioned
  // over the frame view, if the client view ever overlaps the frame view
  // visually (as it does for the browser window), then it will eat events for
  // the window controls. We override this method here so that we can detect
  // this condition and re-route the events to the frame view. The assumption is
  // that the frame view's implementation of HitTest will only return true for
  // area not occupied by the client view.
  if (frame_view_->parent() == this) {
    // During the reset of the frame_view_ it's possible to be in this code
    // after it's been removed from the view hierarchy but before it's been
    // removed from the NonClientView.
    gfx::RectF rect_in_child_coords_f(rect);
    View::ConvertRectToTarget(this, frame_view_.get(), &rect_in_child_coords_f);
    gfx::Rect rect_in_child_coords =
        gfx::ToEnclosingRect(rect_in_child_coords_f);
    if (frame_view_->HitTestRect(rect_in_child_coords)) {
      return frame_view_->GetEventHandlerForRect(rect_in_child_coords);
    }
  }

  return ViewTargeterDelegate::TargetForRect(root, rect);
}

BEGIN_METADATA(NonClientView)
END_METADATA

}  // namespace views