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. 4 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_ 6 #define CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_ 7 8 #include <atlbase.h> 9 #include <atlwin.h> 10 #include <atlcrack.h> 11 #include <oleacc.h> 12 13 #include "base/basictypes.h" 14 #include "base/win/scoped_comptr.h" 15 #include "content/common/content_export.h" 16 #include "ui/gfx/rect.h" 17 18 namespace ui { 19 class WindowEventTarget; 20 } 21 22 namespace content { 23 class RenderWidgetHostViewAura; 24 25 // Reasons for the existence of this class outlined below:- 26 // 1. Some screen readers expect every tab / every unique web content container 27 // to be in its own HWND with class name Chrome_RenderWidgetHostHWND. 28 // With Aura there is one main HWND which comprises the whole browser window 29 // or the whole desktop. So, we need a fake HWND with the window class as 30 // Chrome_RenderWidgetHostHWND as the root of the accessibility tree for 31 // each tab. 32 // 2. There are legacy drivers for trackpads/trackpoints which have special 33 // code for sending mouse wheel and scroll events to the 34 // Chrome_RenderWidgetHostHWND window. 35 // 3. Windowless NPAPI plugins like Flash and Silverlight which expect the 36 // container window to have the same bounds as the web page. In Aura, the 37 // default container window is the whole window which includes the web page 38 // WebContents, etc. This causes the plugin mouse event calculations to 39 // fail. 40 // We should look to get rid of this code when all of the above are fixed. 41 42 // This class implements a child HWND with the same size as the content area, 43 // that delegates its accessibility implementation to the root of the 44 // BrowserAccessibilityManager tree. This HWND is hooked up as the parent of 45 // the root object in the BrowserAccessibilityManager tree, so when any 46 // accessibility client calls ::WindowFromAccessibleObject, they get this 47 // HWND instead of the DesktopWindowTreeHostWin. 48 class CONTENT_EXPORT LegacyRenderWidgetHostHWND 49 : public ATL::CWindowImpl<LegacyRenderWidgetHostHWND, 50 NON_EXPORTED_BASE(ATL::CWindow), 51 ATL::CWinTraits<WS_CHILD> > { 52 public: 53 DECLARE_WND_CLASS_EX(L"Chrome_RenderWidgetHostHWND", CS_DBLCLKS, 0); 54 55 typedef ATL::CWindowImpl<LegacyRenderWidgetHostHWND, 56 NON_EXPORTED_BASE(ATL::CWindow), 57 ATL::CWinTraits<WS_CHILD> > Base; 58 59 // Creates and returns an instance of the LegacyRenderWidgetHostHWND class on 60 // successful creation of a child window parented to the parent window passed 61 // in. 62 static LegacyRenderWidgetHostHWND* Create(HWND parent); 63 64 // Destroys the HWND managed by this class. 65 void Destroy(); 66 67 BEGIN_MSG_MAP_EX(LegacyRenderWidgetHostHWND) 68 MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject) 69 MESSAGE_RANGE_HANDLER(WM_KEYFIRST, WM_KEYLAST, OnKeyboardRange) 70 MESSAGE_HANDLER_EX(WM_PAINT, OnPaint) 71 MESSAGE_HANDLER_EX(WM_NCPAINT, OnNCPaint) 72 MESSAGE_HANDLER_EX(WM_ERASEBKGND, OnEraseBkGnd) 73 MESSAGE_RANGE_HANDLER(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseRange) 74 MESSAGE_HANDLER_EX(WM_MOUSELEAVE, OnMouseLeave) 75 MESSAGE_HANDLER_EX(WM_MOUSEACTIVATE, OnMouseActivate) 76 MESSAGE_HANDLER_EX(WM_SETCURSOR, OnSetCursor) 77 MESSAGE_HANDLER_EX(WM_TOUCH, OnTouch) 78 MESSAGE_HANDLER_EX(WM_HSCROLL, OnScroll) 79 MESSAGE_HANDLER_EX(WM_VSCROLL, OnScroll) 80 MESSAGE_HANDLER_EX(WM_NCHITTEST, OnNCHitTest) 81 MESSAGE_RANGE_HANDLER(WM_NCMOUSEMOVE, WM_NCXBUTTONDBLCLK, 82 OnMouseRange) 83 MESSAGE_HANDLER_EX(WM_NCCALCSIZE, OnNCCalcSize) 84 MESSAGE_HANDLER_EX(WM_SIZE, OnSize) 85 END_MSG_MAP() 86 87 HWND hwnd() { return m_hWnd; } 88 89 // Called when the child window is to be reparented to a new window. 90 // The |parent| parameter contains the new parent window. 91 void UpdateParent(HWND parent); 92 HWND GetParent(); 93 94 IAccessible* window_accessible() { return window_accessible_; } 95 96 // Functions to show and hide the window. 97 void Show(); 98 void Hide(); 99 100 // Resizes the window to the bounds passed in. 101 void SetBounds(const gfx::Rect& bounds); 102 103 // The pointer to the containing RenderWidgetHostViewAura instance is passed 104 // here. 105 void set_host(RenderWidgetHostViewAura* host) { 106 host_ = host; 107 } 108 109 protected: 110 virtual void OnFinalMessage(HWND hwnd) OVERRIDE; 111 112 private: 113 LegacyRenderWidgetHostHWND(HWND parent); 114 ~LegacyRenderWidgetHostHWND(); 115 116 bool Init(); 117 118 // Returns the target to which the windows input events are forwarded. 119 static ui::WindowEventTarget* GetWindowEventTarget(HWND parent); 120 121 LRESULT OnEraseBkGnd(UINT message, WPARAM w_param, LPARAM l_param); 122 LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param); 123 LRESULT OnKeyboardRange(UINT message, WPARAM w_param, LPARAM l_param, 124 BOOL& handled); 125 LRESULT OnMouseLeave(UINT message, WPARAM w_param, LPARAM l_param); 126 LRESULT OnMouseRange(UINT message, WPARAM w_param, LPARAM l_param, 127 BOOL& handled); 128 LRESULT OnMouseActivate(UINT message, WPARAM w_param, LPARAM l_param); 129 LRESULT OnTouch(UINT message, WPARAM w_param, LPARAM l_param); 130 LRESULT OnScroll(UINT message, WPARAM w_param, LPARAM l_param); 131 LRESULT OnNCHitTest(UINT message, WPARAM w_param, LPARAM l_param); 132 133 LRESULT OnNCPaint(UINT message, WPARAM w_param, LPARAM l_param); 134 LRESULT OnPaint(UINT message, WPARAM w_param, LPARAM l_param); 135 LRESULT OnSetCursor(UINT message, WPARAM w_param, LPARAM l_param); 136 LRESULT OnNCCalcSize(UINT message, WPARAM w_param, LPARAM l_param); 137 LRESULT OnSize(UINT message, WPARAM w_param, LPARAM l_param); 138 139 base::win::ScopedComPtr<IAccessible> window_accessible_; 140 141 // Set to true if we turned on mouse tracking. 142 bool mouse_tracking_enabled_; 143 144 RenderWidgetHostViewAura* host_; 145 146 DISALLOW_COPY_AND_ASSIGN(LegacyRenderWidgetHostHWND); 147 }; 148 149 } // namespace content 150 151 #endif // CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_ 152 153