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 "content/renderer/pepper/ppb_scrollbar_impl.h"
6
7#include "base/bind.h"
8#include "base/logging.h"
9#include "base/message_loop/message_loop.h"
10#include "content/renderer/pepper/event_conversion.h"
11#include "content/renderer/pepper/host_globals.h"
12#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
13#include "content/renderer/pepper/plugin_module.h"
14#include "content/renderer/pepper/ppb_image_data_impl.h"
15#include "ppapi/c/dev/ppp_scrollbar_dev.h"
16#include "ppapi/c/pp_bool.h"
17#include "ppapi/thunk/thunk.h"
18#include "skia/ext/platform_canvas.h"
19#include "third_party/WebKit/public/platform/WebCanvas.h"
20#include "third_party/WebKit/public/platform/WebRect.h"
21#include "third_party/WebKit/public/platform/WebVector.h"
22#include "third_party/WebKit/public/web/WebInputEvent.h"
23#include "third_party/WebKit/public/web/WebPluginScrollbar.h"
24
25#if defined(OS_WIN)
26#include "base/win/windows_version.h"
27#endif
28
29using ppapi::thunk::PPB_Scrollbar_API;
30using blink::WebInputEvent;
31using blink::WebRect;
32using blink::WebScrollbar;
33using blink::WebPluginScrollbar;
34
35namespace content {
36
37// static
38PP_Resource PPB_Scrollbar_Impl::Create(PP_Instance instance, bool vertical) {
39  scoped_refptr<PPB_Scrollbar_Impl> scrollbar(new PPB_Scrollbar_Impl(instance));
40  scrollbar->Init(vertical);
41  return scrollbar->GetReference();
42}
43
44PPB_Scrollbar_Impl::PPB_Scrollbar_Impl(PP_Instance instance)
45    : PPB_Widget_Impl(instance), weak_ptr_factory_(this) {}
46
47PPB_Scrollbar_Impl::~PPB_Scrollbar_Impl() {}
48
49void PPB_Scrollbar_Impl::Init(bool vertical) {
50  PepperPluginInstanceImpl* plugin_instance =
51      HostGlobals::Get()->GetInstance(pp_instance());
52  if (!plugin_instance)
53    return;
54  scrollbar_.reset(WebPluginScrollbar::createForPlugin(
55      vertical ? WebScrollbar::Vertical : WebScrollbar::Horizontal,
56      plugin_instance->container(),
57      static_cast<blink::WebPluginScrollbarClient*>(this)));
58}
59
60PPB_Scrollbar_API* PPB_Scrollbar_Impl::AsPPB_Scrollbar_API() { return this; }
61
62void PPB_Scrollbar_Impl::InstanceWasDeleted() { scrollbar_.reset(); }
63
64uint32_t PPB_Scrollbar_Impl::GetThickness() {
65  return WebPluginScrollbar::defaultThickness();
66}
67
68bool PPB_Scrollbar_Impl::IsOverlay() { return scrollbar_->isOverlay(); }
69
70uint32_t PPB_Scrollbar_Impl::GetValue() { return scrollbar_->value(); }
71
72void PPB_Scrollbar_Impl::SetValue(uint32_t value) {
73  if (scrollbar_)
74    scrollbar_->setValue(value);
75}
76
77void PPB_Scrollbar_Impl::SetDocumentSize(uint32_t size) {
78  if (scrollbar_)
79    scrollbar_->setDocumentSize(size);
80}
81
82void PPB_Scrollbar_Impl::SetTickMarks(const PP_Rect* tick_marks,
83                                      uint32_t count) {
84  if (!scrollbar_)
85    return;
86  tickmarks_.resize(count);
87  for (uint32 i = 0; i < count; ++i) {
88    tickmarks_[i] = WebRect(tick_marks[i].point.x,
89                            tick_marks[i].point.y,
90                            tick_marks[i].size.width,
91                            tick_marks[i].size.height);
92    ;
93  }
94  PP_Rect rect = location();
95  Invalidate(&rect);
96}
97
98void PPB_Scrollbar_Impl::ScrollBy(PP_ScrollBy_Dev unit, int32_t multiplier) {
99  if (!scrollbar_)
100    return;
101
102  WebScrollbar::ScrollDirection direction = multiplier >= 0
103                                                ? WebScrollbar::ScrollForward
104                                                : WebScrollbar::ScrollBackward;
105  float fmultiplier = 1.0;
106
107  WebScrollbar::ScrollGranularity granularity;
108  if (unit == PP_SCROLLBY_LINE) {
109    granularity = WebScrollbar::ScrollByLine;
110  } else if (unit == PP_SCROLLBY_PAGE) {
111    granularity = WebScrollbar::ScrollByPage;
112  } else if (unit == PP_SCROLLBY_DOCUMENT) {
113    granularity = WebScrollbar::ScrollByDocument;
114  } else {
115    granularity = WebScrollbar::ScrollByPixel;
116    fmultiplier = static_cast<float>(multiplier);
117    if (fmultiplier < 0)
118      fmultiplier *= -1;
119  }
120  scrollbar_->scroll(direction, granularity, fmultiplier);
121}
122
123PP_Bool PPB_Scrollbar_Impl::PaintInternal(const gfx::Rect& rect,
124                                          PPB_ImageData_Impl* image) {
125  ImageDataAutoMapper mapper(image);
126  skia::PlatformCanvas* canvas = image->GetPlatformCanvas();
127  if (!canvas || !scrollbar_)
128    return PP_FALSE;
129  canvas->save();
130  canvas->scale(scale(), scale());
131  scrollbar_->paint(canvas, rect);
132  canvas->restore();
133
134#if defined(OS_WIN)
135  if (base::win::GetVersion() == base::win::VERSION_XP)
136    skia::MakeOpaque(canvas, rect.x(), rect.y(), rect.width(), rect.height());
137#endif
138
139  return PP_TRUE;
140}
141
142PP_Bool PPB_Scrollbar_Impl::HandleEventInternal(
143    const ppapi::InputEventData& data) {
144  scoped_ptr<WebInputEvent> web_input_event(CreateWebInputEvent(data));
145  if (!web_input_event.get() || !scrollbar_)
146    return PP_FALSE;
147
148  return PP_FromBool(scrollbar_->handleInputEvent(*web_input_event.get()));
149}
150
151void PPB_Scrollbar_Impl::SetLocationInternal(const PP_Rect* location) {
152  if (!scrollbar_)
153    return;
154  scrollbar_->setLocation(WebRect(location->point.x,
155                                  location->point.y,
156                                  location->size.width,
157                                  location->size.height));
158}
159
160void PPB_Scrollbar_Impl::valueChanged(blink::WebPluginScrollbar* scrollbar) {
161  PluginModule* plugin_module =
162      HostGlobals::Get()->GetInstance(pp_instance())->module();
163  if (!plugin_module)
164    return;
165
166  const PPP_Scrollbar_Dev* ppp_scrollbar =
167      static_cast<const PPP_Scrollbar_Dev*>(
168          plugin_module->GetPluginInterface(PPP_SCROLLBAR_DEV_INTERFACE));
169  if (!ppp_scrollbar) {
170    // Try the old version. This is ok because the old interface is a subset of
171    // the new one, and ValueChanged didn't change.
172    ppp_scrollbar = static_cast<const PPP_Scrollbar_Dev*>(
173        plugin_module->GetPluginInterface(PPP_SCROLLBAR_DEV_INTERFACE_0_2));
174    if (!ppp_scrollbar)
175      return;
176  }
177  ppp_scrollbar->ValueChanged(
178      pp_instance(), pp_resource(), scrollbar_->value());
179}
180
181void PPB_Scrollbar_Impl::overlayChanged(WebPluginScrollbar* scrollbar) {
182  PluginModule* plugin_module =
183      HostGlobals::Get()->GetInstance(pp_instance())->module();
184  if (!plugin_module)
185    return;
186
187  const PPP_Scrollbar_Dev* ppp_scrollbar =
188      static_cast<const PPP_Scrollbar_Dev*>(
189          plugin_module->GetPluginInterface(PPP_SCROLLBAR_DEV_INTERFACE));
190  if (!ppp_scrollbar)
191    return;
192  ppp_scrollbar->OverlayChanged(
193      pp_instance(), pp_resource(), PP_FromBool(IsOverlay()));
194}
195
196void PPB_Scrollbar_Impl::invalidateScrollbarRect(
197    blink::WebPluginScrollbar* scrollbar,
198    const blink::WebRect& rect) {
199  gfx::Rect gfx_rect(rect.x, rect.y, rect.width, rect.height);
200  dirty_.Union(gfx_rect);
201  // Can't call into the client to tell them about the invalidate right away,
202  // since the PPB_Scrollbar_Impl code is still in the middle of updating its
203  // internal state.
204  // Note: we use a WeakPtrFactory here so that a lingering callback can not
205  // modify the lifetime of this object. Otherwise, blink::WebPluginScrollbar
206  // could outlive blink::WebPluginContainer, which is against its contract.
207  base::MessageLoop::current()->PostTask(
208      FROM_HERE,
209      base::Bind(&PPB_Scrollbar_Impl::NotifyInvalidate,
210                 weak_ptr_factory_.GetWeakPtr()));
211}
212
213void PPB_Scrollbar_Impl::getTickmarks(
214    blink::WebPluginScrollbar* scrollbar,
215    blink::WebVector<blink::WebRect>* tick_marks) const {
216  if (tickmarks_.empty()) {
217    WebRect* rects = NULL;
218    tick_marks->assign(rects, 0);
219  } else {
220    tick_marks->assign(&tickmarks_[0], tickmarks_.size());
221  }
222}
223
224void PPB_Scrollbar_Impl::NotifyInvalidate() {
225  if (dirty_.IsEmpty())
226    return;
227  PP_Rect pp_rect;
228  pp_rect.point.x = dirty_.x();
229  pp_rect.point.y = dirty_.y();
230  pp_rect.size.width = dirty_.width();
231  pp_rect.size.height = dirty_.height();
232  dirty_ = gfx::Rect();
233  Invalidate(&pp_rect);
234}
235
236}  // namespace content
237