1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ash/keyboard_overlay/keyboard_overlay_delegate.h"
6
7#include <algorithm>
8
9#include "ash/shell.h"
10#include "base/bind.h"
11#include "base/memory/weak_ptr.h"
12#include "base/strings/utf_string_conversions.h"
13#include "base/values.h"
14#include "content/public/browser/web_ui.h"
15#include "content/public/browser/web_ui_message_handler.h"
16#include "ui/aura/window_event_dispatcher.h"
17#include "ui/gfx/screen.h"
18#include "ui/views/controls/webview/web_dialog_view.h"
19#include "ui/views/widget/widget.h"
20
21using content::WebContents;
22using content::WebUIMessageHandler;
23
24namespace {
25
26const int kBaseWidth = 1252;
27const int kBaseHeight = 516;
28const int kHorizontalMargin = 28;
29
30// A message handler for detecting the timing when the web contents is painted.
31class PaintMessageHandler
32    : public WebUIMessageHandler,
33      public base::SupportsWeakPtr<PaintMessageHandler> {
34 public:
35  explicit PaintMessageHandler(views::Widget* widget) : widget_(widget) {}
36  virtual ~PaintMessageHandler() {}
37
38  // WebUIMessageHandler implementation.
39  virtual void RegisterMessages() OVERRIDE;
40
41 private:
42  void DidPaint(const base::ListValue* args);
43
44  views::Widget* widget_;
45
46  DISALLOW_COPY_AND_ASSIGN(PaintMessageHandler);
47};
48
49void PaintMessageHandler::RegisterMessages() {
50  web_ui()->RegisterMessageCallback(
51      "didPaint",
52      base::Bind(&PaintMessageHandler::DidPaint, AsWeakPtr()));
53}
54
55void PaintMessageHandler::DidPaint(const base::ListValue* args) {
56  // Show the widget after the web content has been painted.
57  widget_->Show();
58}
59
60}  // namespace
61
62namespace ash {
63
64KeyboardOverlayDelegate::KeyboardOverlayDelegate(const base::string16& title,
65                                                 const GURL& url)
66    : title_(title),
67      url_(url),
68      widget_(NULL) {
69}
70
71KeyboardOverlayDelegate::~KeyboardOverlayDelegate() {
72}
73
74views::Widget* KeyboardOverlayDelegate::Show(views::WebDialogView* view) {
75  widget_ = new views::Widget;
76  views::Widget::InitParams params(
77      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
78  params.context = Shell::GetPrimaryRootWindow();
79  params.delegate = view;
80  widget_->Init(params);
81
82  // Show the widget at the bottom of the work area.
83  gfx::Size size;
84  GetDialogSize(&size);
85  const gfx::Rect& rect = Shell::GetScreen()->GetDisplayNearestWindow(
86      widget_->GetNativeView()).work_area();
87  gfx::Rect bounds(rect.x() + (rect.width() - size.width()) / 2,
88                   rect.bottom() - size.height(),
89                   size.width(),
90                   size.height());
91  widget_->SetBounds(bounds);
92
93  // The widget will be shown when the web contents gets ready to display.
94  return widget_;
95}
96
97ui::ModalType KeyboardOverlayDelegate::GetDialogModalType() const {
98  return ui::MODAL_TYPE_SYSTEM;
99}
100
101base::string16 KeyboardOverlayDelegate::GetDialogTitle() const {
102  return title_;
103}
104
105GURL KeyboardOverlayDelegate::GetDialogContentURL() const {
106  return url_;
107}
108
109void KeyboardOverlayDelegate::GetWebUIMessageHandlers(
110    std::vector<WebUIMessageHandler*>* handlers) const {
111  handlers->push_back(new PaintMessageHandler(widget_));
112}
113
114void KeyboardOverlayDelegate::GetDialogSize(
115    gfx::Size* size) const {
116  using std::min;
117  DCHECK(widget_);
118  gfx::Rect rect = ash::Shell::GetScreen()->GetDisplayNearestWindow(
119      widget_->GetNativeView()).work_area();
120  const int width = min(kBaseWidth, rect.width() - kHorizontalMargin);
121  const int height = width * kBaseHeight / kBaseWidth;
122  size->SetSize(width, height);
123}
124
125std::string KeyboardOverlayDelegate::GetDialogArgs() const {
126  return "[]";
127}
128
129void KeyboardOverlayDelegate::OnDialogClosed(
130    const std::string& json_retval) {
131  delete this;
132  return;
133}
134
135void KeyboardOverlayDelegate::OnCloseContents(WebContents* source,
136                                              bool* out_close_dialog) {
137}
138
139bool KeyboardOverlayDelegate::ShouldShowDialogTitle() const {
140  return false;
141}
142
143bool KeyboardOverlayDelegate::HandleContextMenu(
144    const content::ContextMenuParams& params) {
145  return true;
146}
147
148}  // namespace ash
149