kicad/include/view/view_item.h

153 lines
5.1 KiB
C++

/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2013-2016 CERN
* Copyright (C) 2020-2021 KiCad Developers, see AUTHORS.txt for contributors.
*
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __VIEW_ITEM_H
#define __VIEW_ITEM_H
#include <vector>
#include <bitset>
#include <math/box2.h>
#include <inspectable.h>
namespace KIGFX
{
// Forward declarations
class VIEW;
class VIEW_ITEM_DATA;
/**
* Define the how severely the appearance of the item has been changed.
*/
enum VIEW_UPDATE_FLAGS {
NONE = 0x00, ///< No updates are required.
APPEARANCE = 0x01, ///< Visibility flag has changed.
COLOR = 0x02, ///< Color has changed.
GEOMETRY = 0x04, ///< Position or shape has changed.
LAYERS = 0x08, ///< Layers have changed.
INITIAL_ADD = 0x10, ///< Item is being added to the view.
REPAINT = 0x20, ///< Item needs to be redrawn.
ALL = 0xef ///< All except INITIAL_ADD.
};
/**
* Define the visibility of the item (temporarily hidden, invisible, etc).
*/
enum VIEW_VISIBILITY_FLAGS {
VISIBLE = 0x01, ///< Item is visible (in general)
HIDDEN = 0x02 ///< Item is temporarily hidden (e.g. being used by a tool).
///< Overrides VISIBLE flag.
};
/**
* An abstract base class for deriving all objects that can be added to a VIEW.
*
* Its role is to:
* - communicate geometry, appearance and visibility updates to the associated dynamic VIEW,
* - provide a bounding box for redraw area calculation,
* - (optional) draw the object using the #GAL API functions for #PAINTER-less implementations.
*
* VIEW_ITEM objects are never owned by a #VIEW. A single VIEW_ITEM can belong to any number of
* static VIEWs, but only one dynamic VIEW due to storage of only one VIEW reference.
*/
class VIEW_ITEM : public INSPECTABLE
{
public:
VIEW_ITEM() :
m_viewPrivData( nullptr )
{
}
virtual ~VIEW_ITEM();
VIEW_ITEM( const VIEW_ITEM& aOther ) = delete;
VIEW_ITEM& operator=( const VIEW_ITEM& aOther ) = delete;
/**
* Return the bounding box of the item covering all its layers.
*
* @return the current bounding box.
*/
virtual const BOX2I ViewBBox() const = 0;
/**
* Draw the parts of the object belonging to layer aLayer.
*
* An alternative way for drawing objects if there is no #PAINTER assigned for the view
* or if the PAINTER doesn't know how to paint this particular implementation of VIEW_ITEM.
* The preferred way of drawing is to design an appropriate PAINTER object, the method
* below is intended only for quick hacks and debugging purposes.
*
* @param aLayer is the current drawing layer.
* @param aView is a pointer to the #VIEW device we are drawing on.
*/
virtual void ViewDraw( int aLayer, VIEW* aView ) const
{}
/**
* Return the all the layers within the VIEW the object is painted on.
*
* For instance, a #PAD spans zero or more copper layers and a few technical layers.
* ViewDraw() or PAINTER::Draw() is repeatedly called for each of the layers returned
* by ViewGetLayers(), depending on the rendering order.
*
* @param aLayers[] is the output layer index array.
* @param aCount is the number of layer indices in aLayers[].
*/
virtual void ViewGetLayers( int aLayers[], int& aCount ) const = 0;
/**
* Return the level of detail (LOD) of the item.
*
* A level of detail is the minimal #VIEW scale that is sufficient for an item to be shown
* on a given layer.
*
* @param aLayer is the current drawing layer.
* @param aView is a pointer to the #VIEW device we are drawing on.
* @return the level of detail. 0 always show the item, because the actual zoom level
* (or VIEW scale) is always > 0
*/
virtual double ViewGetLOD( int aLayer, VIEW* aView ) const
{
// By default always show the item
return 0.0;
}
VIEW_ITEM_DATA* viewPrivData() const
{
return m_viewPrivData;
}
private:
friend class VIEW;
VIEW_ITEM_DATA* m_viewPrivData;
};
} // namespace KIGFX
#endif