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 #ifndef CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_
6 #define CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_
13 #include "base/basictypes.h"
14 #include "base/win/scoped_comptr.h"
15 #include "content/common/content_export.h"
16 #include "ui/gfx/native_widget_types.h"
17 #include "ui/gfx/rect.h"
20 class WindowEventTarget;
24 // Reasons for the existence of this class outlined below:-
25 // 1. Some screen readers expect every tab / every unique web content container
26 // to be in its own HWND with class name Chrome_RenderWidgetHostHWND.
27 // With Aura there is one main HWND which comprises the whole browser window
28 // or the whole desktop. So, we need a fake HWND with the window class as
29 // Chrome_RenderWidgetHostHWND as the root of the accessibility tree for
31 // 2. There are legacy drivers for trackpads/trackpoints which have special
32 // code for sending mouse wheel and scroll events to the
33 // Chrome_RenderWidgetHostHWND window.
34 // 3. Windowless NPAPI plugins like Flash and Silverlight which expect the
35 // container window to have the same bounds as the web page. In Aura, the
36 // default container window is the whole window which includes the web page
37 // WebContents, etc. This causes the plugin mouse event calculations to
39 // We should look to get rid of this code when all of the above are fixed.
41 class LegacyRenderWidgetHostHWNDDelegate;
43 // This class implements a child HWND with the same size as the content area,
44 // and delegates its accessibility implementation to the
45 // gfx::NativeViewAccessible provided by the owner class.
46 class CONTENT_EXPORT LegacyRenderWidgetHostHWND
47 : public ATL::CWindowImpl<LegacyRenderWidgetHostHWND,
48 NON_EXPORTED_BASE(ATL::CWindow),
49 ATL::CWinTraits<WS_CHILD> > {
51 DECLARE_WND_CLASS_EX(L"Chrome_RenderWidgetHostHWND", CS_DBLCLKS, 0);
53 typedef ATL::CWindowImpl<LegacyRenderWidgetHostHWND,
54 NON_EXPORTED_BASE(ATL::CWindow),
55 ATL::CWinTraits<WS_CHILD> > Base;
57 virtual ~LegacyRenderWidgetHostHWND();
59 // Creates and returns an instance of the LegacyRenderWidgetHostHWND class on
60 // successful creation of a child window parented to the parent window passed
62 static LegacyRenderWidgetHostHWND* Create(
64 LegacyRenderWidgetHostHWNDDelegate* delegate);
66 BEGIN_MSG_MAP_EX(LegacyRenderWidgetHostHWND)
67 MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject)
68 MESSAGE_RANGE_HANDLER(WM_KEYFIRST, WM_KEYLAST, OnKeyboardRange)
69 MESSAGE_HANDLER_EX(WM_PAINT, OnPaint)
70 MESSAGE_HANDLER_EX(WM_NCPAINT, OnNCPaint)
71 MESSAGE_HANDLER_EX(WM_ERASEBKGND, OnEraseBkGnd)
72 MESSAGE_RANGE_HANDLER(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseRange)
73 MESSAGE_HANDLER_EX(WM_MOUSELEAVE, OnMouseLeave)
74 MESSAGE_HANDLER_EX(WM_MOUSEACTIVATE, OnMouseActivate)
75 MESSAGE_HANDLER_EX(WM_SETCURSOR, OnSetCursor)
76 MESSAGE_HANDLER_EX(WM_TOUCH, OnTouch)
77 MESSAGE_HANDLER_EX(WM_HSCROLL, OnScroll)
78 MESSAGE_HANDLER_EX(WM_VSCROLL, OnScroll)
79 MESSAGE_HANDLER_EX(WM_NCHITTEST, OnNCHitTest)
80 MESSAGE_RANGE_HANDLER(WM_NCMOUSEMOVE, WM_NCXBUTTONDBLCLK,
82 MESSAGE_HANDLER_EX(WM_NCCALCSIZE, OnNCCalcSize)
83 MESSAGE_HANDLER_EX(WM_SIZE, OnSize)
86 // May be deleted at any time by Windows! Other classes should never store
88 HWND hwnd() { return m_hWnd; }
90 // Called when the child window is to be reparented to a new window.
91 // The |parent| parameter contains the new parent window.
92 void UpdateParent(HWND parent);
95 IAccessible* window_accessible() { return window_accessible_; }
97 // Functions to show and hide the window.
101 // Resizes the window to the bounds passed in.
102 void SetBounds(const gfx::Rect& bounds);
105 LegacyRenderWidgetHostHWND(HWND parent,
106 LegacyRenderWidgetHostHWNDDelegate* delegate);
110 // Returns the target to which the windows input events are forwarded.
111 static ui::WindowEventTarget* GetWindowEventTarget(HWND parent);
113 LRESULT OnEraseBkGnd(UINT message, WPARAM w_param, LPARAM l_param);
114 LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param);
115 LRESULT OnKeyboardRange(UINT message, WPARAM w_param, LPARAM l_param,
117 LRESULT OnMouseLeave(UINT message, WPARAM w_param, LPARAM l_param);
118 LRESULT OnMouseRange(UINT message, WPARAM w_param, LPARAM l_param,
120 LRESULT OnMouseActivate(UINT message, WPARAM w_param, LPARAM l_param);
121 LRESULT OnTouch(UINT message, WPARAM w_param, LPARAM l_param);
122 LRESULT OnScroll(UINT message, WPARAM w_param, LPARAM l_param);
123 LRESULT OnNCHitTest(UINT message, WPARAM w_param, LPARAM l_param);
125 LRESULT OnNCPaint(UINT message, WPARAM w_param, LPARAM l_param);
126 LRESULT OnPaint(UINT message, WPARAM w_param, LPARAM l_param);
127 LRESULT OnSetCursor(UINT message, WPARAM w_param, LPARAM l_param);
128 LRESULT OnNCCalcSize(UINT message, WPARAM w_param, LPARAM l_param);
129 LRESULT OnSize(UINT message, WPARAM w_param, LPARAM l_param);
131 LegacyRenderWidgetHostHWNDDelegate* delegate_;
133 base::win::ScopedComPtr<IAccessible> window_accessible_;
135 // Set to true if we turned on mouse tracking.
136 bool mouse_tracking_enabled_;
138 DISALLOW_COPY_AND_ASSIGN(LegacyRenderWidgetHostHWND);
141 } // namespace content
143 #endif // CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_