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// Copyright (c) 2006-2008 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 CHROME_VIEWS_HWND_VIEW_H__
#define CHROME_VIEWS_HWND_VIEW_H__
#include <string>
#include "chrome/views/view.h"
namespace views {
/////////////////////////////////////////////////////////////////////////////
//
// HWNDView class
//
// The HWNDView class hosts a native window handle (HWND) sizing it
// according to the bounds of the view. This is useful whenever you need to
// show a UI control that has a HWND (e.g. a native windows Edit control)
// within thew View hierarchy and benefit from the sizing/layout.
//
/////////////////////////////////////////////////////////////////////////////
class HWNDView : public View {
public:
HWNDView();
virtual ~HWNDView();
virtual gfx::Size GetPreferredSize();
void set_preferred_size(const gfx::Size& size) { preferred_size_ = size; }
// Attach a window handle to this View, making the window it represents
// subject to sizing according to this View's parent container's Layout
// Manager's sizing heuristics.
void Attach(HWND hwnd);
// Detach the attached window handle. It will no longer be updated
void Detach();
virtual void DidChangeBounds(const gfx::Rect& previous,
const gfx::Rect& current);
virtual void VisibilityChanged(View* starting_from, bool is_visible);
HWND GetHWND() const;
// Resize the hosted HWND to the bounds of this View.
void UpdateHWNDBounds();
virtual void Paint(ChromeCanvas* canvas);
// Overridden from View.
virtual std::string GetClassName() const;
// A HWNDView has an associated focus View so that the focus of the native
// control and of the View are kept in sync. In simple cases where the
// HWNDView directly wraps a native window as is, the associated view is this
// View. In other cases where the HWNDView is part of another view (such as
// TextField), the actual View is not the HWNDView and this method must be
// called to set that.
// This method must be called before Attach().
void SetAssociatedFocusView(View* view);
void set_fast_resize(bool fast_resize) { fast_resize_ = fast_resize; }
protected:
virtual void ViewHierarchyChanged(bool is_add, View *parent, View *child);
// Notification that our visible bounds relative to the root has changed.
// This updates the bounds of the HWND.
virtual void VisibleBoundsInRootChanged();
virtual void Focus();
private:
// The hosted window handle.
HWND hwnd_;
// The preferred size of this View
gfx::Size preferred_size_;
// Have we installed a region on the HWND used to clip to only the visible
// portion of the HWND?
bool installed_clip_;
// Fast resizing will move the hwnd and clip its window region, this will
// result in white areas and will not resize the content (so scrollbars
// will be all wrong and content will flow offscreen). Only use this
// when you're doing extremely quick, high-framerate vertical resizes
// and don't care about accuracy. Make sure you do a real resize at the
// end. USE WITH CAUTION.
bool fast_resize_;
// The view that should be given focus when this HWNDView is focused.
View* focus_view_;
};
} // namespace views
#endif // CHROME_VIEWS_HWND_VIEW_H__
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