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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_VIEWS_HWND_VIEW_H__
#define CHROME_VIEWS_HWND_VIEW_H__
#include <string>
#include "chrome/views/view.h"
namespace ChromeViews {
/////////////////////////////////////////////////////////////////////////////
//
// 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 void GetPreferredSize(CSize *out);
void SetPreferredSize(const CSize& 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 CRect& previous, const CRect& 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();
private:
// The hosted window handle.
HWND hwnd_;
// The preferred size of this View
CSize 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_;
};
}
#endif // CHROME_VIEWS_HWND_VIEW_H__
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