Battery Status API: add UMA logging for Linux.
[chromium-blink-merge.git] / content / browser / renderer_host / legacy_render_widget_host_win.cc
blob327e0b9b43e73df9a7280366ecd5d05eed899ba2
1 // Copyright (c) 2014 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.
5 #include "content/browser/renderer_host/legacy_render_widget_host_win.h"
7 #include "base/command_line.h"
8 #include "base/memory/scoped_ptr.h"
9 #include "base/win/windows_version.h"
10 #include "content/browser/accessibility/browser_accessibility_manager_win.h"
11 #include "content/browser/accessibility/browser_accessibility_win.h"
12 #include "content/browser/renderer_host/render_widget_host_impl.h"
13 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
14 #include "content/public/browser/browser_accessibility_state.h"
15 #include "content/public/common/content_switches.h"
16 #include "ui/base/touch/touch_enabled.h"
17 #include "ui/base/view_prop.h"
18 #include "ui/base/win/internal_constants.h"
19 #include "ui/base/win/window_event_target.h"
20 #include "ui/gfx/geometry/rect.h"
21 #include "ui/gfx/win/dpi.h"
23 namespace content {
25 // A custom MSAA object id used to determine if a screen reader or some
26 // other client is listening on MSAA events - if so, we enable full web
27 // accessibility support.
28 const int kIdScreenReaderHoneyPot = 1;
30 // static
31 LegacyRenderWidgetHostHWND* LegacyRenderWidgetHostHWND::Create(
32 HWND parent) {
33 // content_unittests passes in the desktop window as the parent. We allow
34 // the LegacyRenderWidgetHostHWND instance to be created in this case for
35 // these tests to pass.
36 if (CommandLine::ForCurrentProcess()->HasSwitch(
37 switches::kDisableLegacyIntermediateWindow) ||
38 (!GetWindowEventTarget(parent) && parent != ::GetDesktopWindow()))
39 return NULL;
41 LegacyRenderWidgetHostHWND* legacy_window_instance =
42 new LegacyRenderWidgetHostHWND(parent);
43 // If we failed to create the child, or if the switch to disable the legacy
44 // window is passed in, then return NULL.
45 if (!::IsWindow(legacy_window_instance->hwnd())) {
46 delete legacy_window_instance;
47 return NULL;
49 legacy_window_instance->Init();
50 return legacy_window_instance;
53 void LegacyRenderWidgetHostHWND::Destroy() {
54 if (::IsWindow(hwnd()))
55 ::DestroyWindow(hwnd());
58 void LegacyRenderWidgetHostHWND::UpdateParent(HWND parent) {
59 ::SetParent(hwnd(), parent);
60 // If the new parent is the desktop Window, then we disable the child window
61 // to ensure that it does not receive any input events. It should not because
62 // of WS_EX_TRANSPARENT. This is only for safety.
63 if (parent == ::GetDesktopWindow()) {
64 ::EnableWindow(hwnd(), FALSE);
65 } else {
66 ::EnableWindow(hwnd(), TRUE);
70 HWND LegacyRenderWidgetHostHWND::GetParent() {
71 return ::GetParent(hwnd());
74 void LegacyRenderWidgetHostHWND::Show() {
75 ::ShowWindow(hwnd(), SW_SHOW);
78 void LegacyRenderWidgetHostHWND::Hide() {
79 ::ShowWindow(hwnd(), SW_HIDE);
82 void LegacyRenderWidgetHostHWND::SetBounds(const gfx::Rect& bounds) {
83 gfx::Rect bounds_in_pixel = gfx::win::DIPToScreenRect(bounds);
84 ::SetWindowPos(hwnd(), NULL, bounds_in_pixel.x(), bounds_in_pixel.y(),
85 bounds_in_pixel.width(), bounds_in_pixel.height(),
86 SWP_NOREDRAW);
89 void LegacyRenderWidgetHostHWND::OnFinalMessage(HWND hwnd) {
90 if (host_) {
91 host_->OnLegacyWindowDestroyed();
92 host_ = NULL;
94 delete this;
97 LegacyRenderWidgetHostHWND::LegacyRenderWidgetHostHWND(HWND parent)
98 : mouse_tracking_enabled_(false),
99 host_(NULL) {
100 RECT rect = {0};
101 Base::Create(parent, rect, L"Chrome Legacy Window",
102 WS_CHILDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
103 WS_EX_TRANSPARENT);
106 LegacyRenderWidgetHostHWND::~LegacyRenderWidgetHostHWND() {
107 DCHECK(!::IsWindow(hwnd()));
110 bool LegacyRenderWidgetHostHWND::Init() {
111 if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
112 ui::AreTouchEventsEnabled())
113 RegisterTouchWindow(hwnd(), TWF_WANTPALM);
115 HRESULT hr = ::CreateStdAccessibleObject(
116 hwnd(), OBJID_WINDOW, IID_IAccessible,
117 reinterpret_cast<void **>(window_accessible_.Receive()));
118 DCHECK(SUCCEEDED(hr));
120 if (!BrowserAccessibilityState::GetInstance()->IsAccessibleBrowser()) {
121 // Attempt to detect screen readers or other clients who want full
122 // accessibility support, by seeing if they respond to this event.
123 NotifyWinEvent(EVENT_SYSTEM_ALERT, hwnd(), kIdScreenReaderHoneyPot,
124 CHILDID_SELF);
127 return !!SUCCEEDED(hr);
130 // static
131 ui::WindowEventTarget* LegacyRenderWidgetHostHWND::GetWindowEventTarget(
132 HWND parent) {
133 return reinterpret_cast<ui::WindowEventTarget*>(ui::ViewProp::GetValue(
134 parent, ui::WindowEventTarget::kWin32InputEventTarget));
137 LRESULT LegacyRenderWidgetHostHWND::OnEraseBkGnd(UINT message,
138 WPARAM w_param,
139 LPARAM l_param) {
140 return 1;
143 LRESULT LegacyRenderWidgetHostHWND::OnGetObject(UINT message,
144 WPARAM w_param,
145 LPARAM l_param) {
146 // Only the lower 32 bits of l_param are valid when checking the object id
147 // because it sometimes gets sign-extended incorrectly (but not always).
148 DWORD obj_id = static_cast<DWORD>(static_cast<DWORD_PTR>(l_param));
150 if (kIdScreenReaderHoneyPot == obj_id) {
151 // When an MSAA client has responded to our fake event on this id,
152 // enable screen reader support.
153 BrowserAccessibilityState::GetInstance()->OnScreenReaderDetected();
154 return static_cast<LRESULT>(0L);
157 if (OBJID_CLIENT != obj_id || !host_)
158 return static_cast<LRESULT>(0L);
160 RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(
161 host_->GetRenderWidgetHost());
162 if (!rwhi)
163 return static_cast<LRESULT>(0L);
165 BrowserAccessibilityManagerWin* manager =
166 static_cast<BrowserAccessibilityManagerWin*>(
167 rwhi->GetRootBrowserAccessibilityManager());
168 if (!manager)
169 return static_cast<LRESULT>(0L);
171 base::win::ScopedComPtr<IAccessible> root(
172 manager->GetRoot()->ToBrowserAccessibilityWin());
173 return LresultFromObject(IID_IAccessible, w_param,
174 static_cast<IAccessible*>(root.Detach()));
177 // We send keyboard/mouse/touch messages to the parent window via SendMessage.
178 // While this works, this has the side effect of converting input messages into
179 // sent messages which changes their priority and could technically result
180 // in these messages starving other messages in the queue. Additionally
181 // keyboard/mouse hooks would not see these messages. The alternative approach
182 // is to set and release capture as needed on the parent to ensure that it
183 // receives all mouse events. However that was shelved due to possible issues
184 // with capture changes.
185 LRESULT LegacyRenderWidgetHostHWND::OnKeyboardRange(UINT message,
186 WPARAM w_param,
187 LPARAM l_param,
188 BOOL& handled) {
189 LRESULT ret = 0;
190 if (GetWindowEventTarget(GetParent())) {
191 bool msg_handled = false;
192 ret = GetWindowEventTarget(GetParent())->HandleKeyboardMessage(
193 message, w_param, l_param, &msg_handled);
194 handled = msg_handled;
196 return ret;
199 LRESULT LegacyRenderWidgetHostHWND::OnMouseRange(UINT message,
200 WPARAM w_param,
201 LPARAM l_param,
202 BOOL& handled) {
203 if (message == WM_MOUSEMOVE) {
204 if (!mouse_tracking_enabled_) {
205 mouse_tracking_enabled_ = true;
206 TRACKMOUSEEVENT tme;
207 tme.cbSize = sizeof(tme);
208 tme.dwFlags = TME_LEAVE;
209 tme.hwndTrack = hwnd();
210 tme.dwHoverTime = 0;
211 TrackMouseEvent(&tme);
214 // The offsets for WM_NCXXX and WM_MOUSEWHEEL and WM_MOUSEHWHEEL messages are
215 // in screen coordinates. We should not be converting them to parent
216 // coordinates.
217 if ((message >= WM_MOUSEFIRST && message <= WM_MOUSELAST) &&
218 (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL)) {
219 POINT mouse_coords;
220 mouse_coords.x = GET_X_LPARAM(l_param);
221 mouse_coords.y = GET_Y_LPARAM(l_param);
222 ::MapWindowPoints(hwnd(), GetParent(), &mouse_coords, 1);
223 l_param = MAKELPARAM(mouse_coords.x, mouse_coords.y);
226 LRESULT ret = 0;
228 if (GetWindowEventTarget(GetParent())) {
229 bool msg_handled = false;
230 ret = GetWindowEventTarget(GetParent())->HandleMouseMessage(
231 message, w_param, l_param, &msg_handled);
232 handled = msg_handled;
233 // If the parent did not handle non client mouse messages, we call
234 // DefWindowProc on the message with the parent window handle. This
235 // ensures that WM_SYSCOMMAND is generated for the parent and we are
236 // out of the picture.
237 if (!handled &&
238 (message >= WM_NCMOUSEMOVE && message <= WM_NCXBUTTONDBLCLK)) {
239 ret = ::DefWindowProc(GetParent(), message, w_param, l_param);
240 handled = TRUE;
243 return ret;
246 LRESULT LegacyRenderWidgetHostHWND::OnMouseLeave(UINT message,
247 WPARAM w_param,
248 LPARAM l_param) {
249 mouse_tracking_enabled_ = false;
250 LRESULT ret = 0;
251 if ((::GetCapture() != GetParent()) && GetWindowEventTarget(GetParent())) {
252 // We should send a WM_MOUSELEAVE to the parent window only if the mouse
253 // has moved outside the bounds of the parent.
254 POINT cursor_pos;
255 ::GetCursorPos(&cursor_pos);
256 if (::WindowFromPoint(cursor_pos) != GetParent()) {
257 bool msg_handled = false;
258 ret = GetWindowEventTarget(GetParent())->HandleMouseMessage(
259 message, w_param, l_param, &msg_handled);
260 SetMsgHandled(msg_handled);
263 return ret;
266 LRESULT LegacyRenderWidgetHostHWND::OnMouseActivate(UINT message,
267 WPARAM w_param,
268 LPARAM l_param) {
269 // Don't pass this to DefWindowProc. That results in the WM_MOUSEACTIVATE
270 // message going all the way to the parent which then messes up state
271 // related to focused views, etc. This is because it treats this as if
272 // it lost activation.
273 // Our dummy window should not interfere with focus and activation in
274 // the parent. Return MA_ACTIVATE here ensures that focus state in the parent
275 // is preserved. The only exception is if the parent was created with the
276 // WS_EX_NOACTIVATE style.
277 if (::GetWindowLong(GetParent(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)
278 return MA_NOACTIVATE;
279 // On Windows, if we select the menu item by touch and if the window at the
280 // location is another window on the same thread, that window gets a
281 // WM_MOUSEACTIVATE message and ends up activating itself, which is not
282 // correct. We workaround this by setting a property on the window at the
283 // current cursor location. We check for this property in our
284 // WM_MOUSEACTIVATE handler and don't activate the window if the property is
285 // set.
286 if (::GetProp(hwnd(), ui::kIgnoreTouchMouseActivateForWindow)) {
287 ::RemoveProp(hwnd(), ui::kIgnoreTouchMouseActivateForWindow);
288 return MA_NOACTIVATE;
290 return MA_ACTIVATE;
293 LRESULT LegacyRenderWidgetHostHWND::OnTouch(UINT message,
294 WPARAM w_param,
295 LPARAM l_param) {
296 LRESULT ret = 0;
297 if (GetWindowEventTarget(GetParent())) {
298 bool msg_handled = false;
299 ret = GetWindowEventTarget(GetParent())->HandleTouchMessage(
300 message, w_param, l_param, &msg_handled);
301 SetMsgHandled(msg_handled);
303 return ret;
306 LRESULT LegacyRenderWidgetHostHWND::OnScroll(UINT message,
307 WPARAM w_param,
308 LPARAM l_param) {
309 LRESULT ret = 0;
310 if (GetWindowEventTarget(GetParent())) {
311 bool msg_handled = false;
312 ret = GetWindowEventTarget(GetParent())->HandleScrollMessage(
313 message, w_param, l_param, &msg_handled);
314 SetMsgHandled(msg_handled);
316 return ret;
319 LRESULT LegacyRenderWidgetHostHWND::OnNCHitTest(UINT message,
320 WPARAM w_param,
321 LPARAM l_param) {
322 if (GetWindowEventTarget(GetParent())) {
323 bool msg_handled = false;
324 LRESULT hit_test = GetWindowEventTarget(
325 GetParent())->HandleNcHitTestMessage(message, w_param, l_param,
326 &msg_handled);
327 // If the parent returns HTNOWHERE which can happen for popup windows, etc
328 // we return HTCLIENT.
329 if (hit_test == HTNOWHERE)
330 hit_test = HTCLIENT;
331 return hit_test;
333 return HTNOWHERE;
336 LRESULT LegacyRenderWidgetHostHWND::OnNCPaint(UINT message,
337 WPARAM w_param,
338 LPARAM l_param) {
339 return 0;
342 LRESULT LegacyRenderWidgetHostHWND::OnPaint(UINT message,
343 WPARAM w_param,
344 LPARAM l_param) {
345 PAINTSTRUCT ps = {0};
346 ::BeginPaint(hwnd(), &ps);
347 ::EndPaint(hwnd(), &ps);
348 return 0;
351 LRESULT LegacyRenderWidgetHostHWND::OnSetCursor(UINT message,
352 WPARAM w_param,
353 LPARAM l_param) {
354 return 0;
357 LRESULT LegacyRenderWidgetHostHWND::OnNCCalcSize(UINT message,
358 WPARAM w_param,
359 LPARAM l_param) {
360 // Prevent scrollbars, etc from drawing.
361 return 0;
364 LRESULT LegacyRenderWidgetHostHWND::OnSize(UINT message,
365 WPARAM w_param,
366 LPARAM l_param) {
367 // Certain trackpad drivers on Windows have bugs where in they don't generate
368 // WM_MOUSEWHEEL messages for the trackpoint and trackpad scrolling gestures
369 // unless there is an entry for Chrome with the class name of the Window.
370 // Additionally others check if the window WS_VSCROLL/WS_HSCROLL styles and
371 // generate the legacy WM_VSCROLL/WM_HSCROLL messages.
372 // We add these styles to ensure that trackpad/trackpoint scrolling
373 // work.
374 long current_style = ::GetWindowLong(hwnd(), GWL_STYLE);
375 ::SetWindowLong(hwnd(), GWL_STYLE,
376 current_style | WS_VSCROLL | WS_HSCROLL);
377 return 0;
380 } // namespace content