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// Copyright (c) 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_
#define CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_
#include <atlbase.h>
#include <atlwin.h>
#include <atlcrack.h>
#include <oleacc.h>
#include "base/basictypes.h"
#include "base/win/scoped_comptr.h"
#include "content/common/content_export.h"
#include "ui/gfx/geometry/rect.h"
namespace ui {
class WindowEventTarget;
}
namespace content {
class RenderWidgetHostViewAura;
// Reasons for the existence of this class outlined below:-
// 1. Some screen readers expect every tab / every unique web content container
// to be in its own HWND with class name Chrome_RenderWidgetHostHWND.
// With Aura there is one main HWND which comprises the whole browser window
// or the whole desktop. So, we need a fake HWND with the window class as
// Chrome_RenderWidgetHostHWND as the root of the accessibility tree for
// each tab.
// 2. There are legacy drivers for trackpads/trackpoints which have special
// code for sending mouse wheel and scroll events to the
// Chrome_RenderWidgetHostHWND window.
// 3. Windowless NPAPI plugins like Flash and Silverlight which expect the
// container window to have the same bounds as the web page. In Aura, the
// default container window is the whole window which includes the web page
// WebContents, etc. This causes the plugin mouse event calculations to
// fail.
// We should look to get rid of this code when all of the above are fixed.
// This class implements a child HWND with the same size as the content area,
// that delegates its accessibility implementation to the root of the
// BrowserAccessibilityManager tree. This HWND is hooked up as the parent of
// the root object in the BrowserAccessibilityManager tree, so when any
// accessibility client calls ::WindowFromAccessibleObject, they get this
// HWND instead of the DesktopWindowTreeHostWin.
class CONTENT_EXPORT LegacyRenderWidgetHostHWND
: public ATL::CWindowImpl<LegacyRenderWidgetHostHWND,
NON_EXPORTED_BASE(ATL::CWindow),
ATL::CWinTraits<WS_CHILD> > {
public:
DECLARE_WND_CLASS_EX(L"Chrome_RenderWidgetHostHWND", CS_DBLCLKS, 0);
typedef ATL::CWindowImpl<LegacyRenderWidgetHostHWND,
NON_EXPORTED_BASE(ATL::CWindow),
ATL::CWinTraits<WS_CHILD> > Base;
// Creates and returns an instance of the LegacyRenderWidgetHostHWND class on
// successful creation of a child window parented to the parent window passed
// in.
static LegacyRenderWidgetHostHWND* Create(HWND parent);
// Destroys the HWND managed by this class.
void Destroy();
BEGIN_MSG_MAP_EX(LegacyRenderWidgetHostHWND)
MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject)
MESSAGE_RANGE_HANDLER(WM_KEYFIRST, WM_KEYLAST, OnKeyboardRange)
MESSAGE_HANDLER_EX(WM_PAINT, OnPaint)
MESSAGE_HANDLER_EX(WM_NCPAINT, OnNCPaint)
MESSAGE_HANDLER_EX(WM_ERASEBKGND, OnEraseBkGnd)
MESSAGE_RANGE_HANDLER(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseRange)
MESSAGE_HANDLER_EX(WM_MOUSELEAVE, OnMouseLeave)
MESSAGE_HANDLER_EX(WM_MOUSEACTIVATE, OnMouseActivate)
MESSAGE_HANDLER_EX(WM_SETCURSOR, OnSetCursor)
MESSAGE_HANDLER_EX(WM_TOUCH, OnTouch)
MESSAGE_HANDLER_EX(WM_HSCROLL, OnScroll)
MESSAGE_HANDLER_EX(WM_VSCROLL, OnScroll)
MESSAGE_HANDLER_EX(WM_NCHITTEST, OnNCHitTest)
MESSAGE_RANGE_HANDLER(WM_NCMOUSEMOVE, WM_NCXBUTTONDBLCLK,
OnMouseRange)
MESSAGE_HANDLER_EX(WM_NCCALCSIZE, OnNCCalcSize)
MESSAGE_HANDLER_EX(WM_SIZE, OnSize)
END_MSG_MAP()
HWND hwnd() { return m_hWnd; }
// Called when the child window is to be reparented to a new window.
// The |parent| parameter contains the new parent window.
void UpdateParent(HWND parent);
HWND GetParent();
IAccessible* window_accessible() { return window_accessible_.get(); }
// Functions to show and hide the window.
void Show();
void Hide();
// Resizes the window to the bounds passed in.
void SetBounds(const gfx::Rect& bounds);
// The pointer to the containing RenderWidgetHostViewAura instance is passed
// here.
void set_host(RenderWidgetHostViewAura* host) {
host_ = host;
}
protected:
void OnFinalMessage(HWND hwnd) override;
private:
LegacyRenderWidgetHostHWND(HWND parent);
~LegacyRenderWidgetHostHWND() override;
bool Init();
// Returns the target to which the windows input events are forwarded.
static ui::WindowEventTarget* GetWindowEventTarget(HWND parent);
LRESULT OnEraseBkGnd(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnKeyboardRange(UINT message, WPARAM w_param, LPARAM l_param,
BOOL& handled);
LRESULT OnMouseLeave(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnMouseRange(UINT message, WPARAM w_param, LPARAM l_param,
BOOL& handled);
LRESULT OnMouseActivate(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnTouch(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnScroll(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnNCHitTest(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnNCPaint(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnPaint(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnSetCursor(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnNCCalcSize(UINT message, WPARAM w_param, LPARAM l_param);
LRESULT OnSize(UINT message, WPARAM w_param, LPARAM l_param);
base::win::ScopedComPtr<IAccessible> window_accessible_;
// Set to true if we turned on mouse tracking.
bool mouse_tracking_enabled_;
RenderWidgetHostViewAura* host_;
DISALLOW_COPY_AND_ASSIGN(LegacyRenderWidgetHostHWND);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_LEGACY_RENDER_WIDGET_HOST_WIN_H_
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