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px4-firmware/NxWidgets/libnxwidgets/include/crectcache.hxx

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/****************************************************************************
* NxWidgets/libnxwidgets/include/crectcache.hxx
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX, NxWidgets, nor the names of its contributors
* me 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.
*
****************************************************************************
*
* Portions of this package derive from Woopsi (http://woopsi.org/) and
* portions are original efforts. It is difficult to determine at this
* point what parts are original efforts and which parts derive from Woopsi.
* However, in any event, the work of Antony Dzeryn will be acknowledged
* in most NxWidget files. Thanks Antony!
*
* Copyright (c) 2007-2011, Antony Dzeryn
* 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 names "Woopsi", "Simian Zombie" 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 Antony Dzeryn ``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 Antony Dzeryn 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 __INCLUDE_CRECTCACHE_HXX
#define __INCLUDE_CRECTCACHE_HXX
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <nuttx/nx/nxglib.h>
#include "cnxwidget.hxx"
#include "cwidgetstyle.hxx"
#include "tnxarray.hxx"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Implementation Classes
****************************************************************************/
#if defined(__cplusplus)
namespace NXWidgets
{
/**
* Maintains a list of foreground (ie. above children) and background (with
* child overlapped-rects removed) rectangles representing the visible portions
* of a widget.
*/
class CRectCache
{
private:
TNxArray<CRect> m_foregroundRegions; /**< List of the widget's visible regions */
TNxArray<CRect> m_backgroundRegions; /**< List of the widget's visible regions with child rects removed */
const CNxWidget *m_widget; /**< Owning widget */
bool m_foregroundInvalid; /**< True if the foreground cache needs refreshing */
bool m_backgroundInvalid; /**< True if the background cache needs refreshing */
/**
* Cache the foreground regions.
*/
void cacheForegroundRegions(void);
/**
* Cache the background regions.
*/
void cacheBackgroundRegions(void);
public:
/**
* Constructor.
*
* @param widget Widget that contains the rect cache.
*/
CRectCache(const CNxWidget *widget);
/**
* Destructor.
*/
inline ~CRectCache() { }
/**
* Rebuild the cache if it is invalid.
*/
void cache(void);
/**
* Invalidates the cache.
*/
inline void invalidate(void)
{
m_foregroundInvalid = true;
m_backgroundInvalid = true;
};
/**
* Return the list of background regions. These are regions that are not overlapped by
* child widgets.
*
* @return The list of background regions.
*/
inline TNxArray<CRect> *getBackgroundRegions(void)
{
return &m_backgroundRegions;
}
/**
* Return the list of foreground regions. These are regions that represent the entire
* visible surface of the widget - that is, any regions not overlapped by ancestors or
* sublings of the widget - including any regions that are actually overlapped by
* child widgets.
*
* @return The list of foreground regions.
*/
inline TNxArray<CRect> *getForegroundRegions(void)
{
return &m_foregroundRegions;
}
/**
* Works out which rectangles in the invalidRects list overlap this
* widget, then cuts the rectangles into smaller pieces. The overlapping
* pieces are pushed into validRects, and the non-overlapping pieces are
* pushed back into the invalidRects vector.
*
* @param invalidRects A vector of regions that need to be tested
* for collisions against this widget; they represent regions that need
* to be redrawn.
* @param validRects A vector of regions that represents areas of the
* display that do not need to be redrawn.
* @param sender Pointer to the widget that initiated the split.
*/
void splitRectangles(TNxArray<CRect> *invalidRects,
TNxArray<CRect> *validRects,
FAR const CNxWidget *sender) const;
/**
* Move any rectangles from the visibleRects list that overlap this widget
* into the invisibleRects list. Used during visible region calculations.
*
* @param visibleRects A vector of regions that are not overlapped.
* @param invisibleRects A vector of regions that are overlapped.
* @param widget The widget that requested the lists.
* @see splitRectangles()
*/
void removeOverlappedRects(TNxArray<CRect> *visibleRects,
TNxArray<CRect> *invisibleRects,
FAR const CNxWidget* widget) const;
};
}
#endif // __cplusplus
#endif // __INCLUDE_CRECTCACHE_HXX
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