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/*
* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd. All rights reserved.
* Copyright (C) 2013 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 Widget_h
#define Widget_h
#include "platform/PlatformExport.h"
#include "platform/geometry/IntRect.h"
#include "wtf/Forward.h"
#include "wtf/RefCounted.h"
namespace WebCore {
class Event;
class GraphicsContext;
class HostWindow;
// The Widget class serves as a base class for three kinds of objects:
// (1) Scrollable areas (ScrollView)
// (2) Scrollbars (Scrollbar)
// (3) Plugins (PluginView)
//
// Widgets are connected in a hierarchy, with the restriction that plugins and
// scrollbars are always leaves of the tree. Only ScrollViews can have children
// (and therefore the Widget class has no concept of children).
class PLATFORM_EXPORT Widget : public RefCounted<Widget> {
public:
Widget();
virtual ~Widget();
int x() const { return frameRect().x(); }
int y() const { return frameRect().y(); }
int width() const { return frameRect().width(); }
int height() const { return frameRect().height(); }
IntSize size() const { return frameRect().size(); }
IntPoint location() const { return frameRect().location(); }
virtual void setFrameRect(const IntRect& frame) { m_frame = frame; }
const IntRect& frameRect() const { return m_frame; }
IntRect boundsRect() const { return IntRect(0, 0, width(), height()); }
void resize(int w, int h) { setFrameRect(IntRect(x(), y(), w, h)); }
void resize(const IntSize& s) { setFrameRect(IntRect(location(), s)); }
void move(int x, int y) { setFrameRect(IntRect(x, y, width(), height())); }
void move(const IntPoint& p) { setFrameRect(IntRect(p, size())); }
virtual void paint(GraphicsContext*, const IntRect&) { }
void invalidate() { invalidateRect(boundsRect()); }
virtual void invalidateRect(const IntRect&) = 0;
virtual void setFocus(bool) { }
virtual void show() { }
virtual void hide() { }
bool isSelfVisible() const { return m_selfVisible; } // Whether or not we have been explicitly marked as visible or not.
bool isParentVisible() const { return m_parentVisible; } // Whether or not our parent is visible.
bool isVisible() const { return m_selfVisible && m_parentVisible; } // Whether or not we are actually visible.
virtual void setParentVisible(bool visible) { m_parentVisible = visible; }
void setSelfVisible(bool v) { m_selfVisible = v; }
virtual bool isFrameView() const { return false; }
virtual bool isPluginView() const { return false; }
virtual bool isPluginContainer() const { return false; }
virtual bool isScrollbar() const { return false; }
virtual bool isScrollView() const { return false; }
virtual HostWindow* hostWindow() const { ASSERT_NOT_REACHED(); return 0; }
virtual void setParent(Widget*);
Widget* parent() const { return m_parent; }
Widget* root() const;
virtual void handleEvent(Event*) { }
IntRect convertToRootView(const IntRect&) const;
IntRect convertFromRootView(const IntRect&) const;
IntPoint convertToRootView(const IntPoint&) const;
IntPoint convertFromRootView(const IntPoint&) const;
// It is important for cross-platform code to realize that Mac has flipped coordinates. Therefore any code
// that tries to convert the location of a rect using the point-based convertFromContainingWindow will end
// up with an inaccurate rect. Always make sure to use the rect-based convertFromContainingWindow method
// when converting window rects.
IntRect convertToContainingWindow(const IntRect&) const;
IntRect convertFromContainingWindow(const IntRect&) const;
IntPoint convertToContainingWindow(const IntPoint&) const;
IntPoint convertFromContainingWindow(const IntPoint&) const;
virtual void frameRectsChanged() { }
// Notifies this widget that other widgets on the page have been repositioned.
virtual void widgetPositionsUpdated() { }
// Notifies this widget that its clip rect changed.
virtual void clipRectChanged() { }
// Virtual methods to convert points to/from the containing ScrollView
virtual IntRect convertToContainingView(const IntRect&) const;
virtual IntRect convertFromContainingView(const IntRect&) const;
virtual IntPoint convertToContainingView(const IntPoint&) const;
virtual IntPoint convertFromContainingView(const IntPoint&) const;
// Virtual methods to convert points to/from child widgets
virtual IntPoint convertChildToSelf(const Widget*, const IntPoint&) const;
virtual IntPoint convertSelfToChild(const Widget*, const IntPoint&) const;
// Notifies this widget that it will no longer be receiving events.
virtual void eventListenersRemoved() { }
private:
Widget* m_parent;
IntRect m_frame;
bool m_selfVisible;
bool m_parentVisible;
};
} // namespace WebCore
#endif // Widget_h
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