kicad/include/class_sch_screen.h

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
 * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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
 */

/**
 * @file class_sch_screen.h
 * @brief Definitions for the Eeschema program SCH_SCREEN class.
 */

#ifndef CLASS_SCREEN_H
#define CLASS_SCREEN_H

#include "macros.h"
#include "sch_item_struct.h"
#include "class_base_screen.h"

#include "../eeschema/general.h"


class LIB_PIN;
class SCH_COMPONENT;
class SCH_SHEET_PATH;
class SCH_SHEET_PIN;
class SCH_LINE;
class SCH_TEXT;
class PLOTTER;


enum SCH_LINE_TEST_T
{
    ENTIRE_LENGTH_T,
    END_POINTS_ONLY_T,
    EXCLUDE_END_POINTS_T
};


/* Max number of sheets in a hierarchy project: */
#define NB_MAX_SHEET 500


class SCH_SCREEN : public BASE_SCREEN
{
    int       m_refCount;     ///< Number of sheets referencing this screen.
                              ///< Delete when it goes to zero.

    /**
     * Function addConnectedItemsToBlock
     * add items connected at \a aPosition to the block pick list.
     * <p>
     * This method tests all connectible unselected items in the screen that are connected to
     * \a aPosition and adds them to the block selection pick list.  This is used when a block
     * drag is being performed to ensure connections to items in the block are not lost.
     *</p>
     * @param aPosition = The connection point to test.
     */
    void addConnectedItemsToBlock( const wxPoint& aPosition );

public:
    SCH_SCREEN( KICAD_T aType = SCH_SCREEN_T );
    ~SCH_SCREEN();

    virtual wxString GetClass() const
    {
        return wxT( "SCH_SCREEN" );
    }

    void DecRefCount();

    void IncRefCount();

    int GetRefCount() const { return m_refCount; }

    /**
     * Function GetDrawItems().
     *
     * @return - A pointer to the first item in the linked list of draw items.
     */
    virtual SCH_ITEM* GetDrawItems() const { return (SCH_ITEM*) BASE_SCREEN::GetDrawItems(); }

    virtual void SetDrawItems( SCH_ITEM* aItem ) { BASE_SCREEN::SetDrawItems( aItem ); }

    /**
     * Function GetCurItem
     * returns the currently selected SCH_ITEM, overriding BASE_SCREEN::GetCurItem().
     * @return SCH_ITEM* - the one selected, or NULL.
     */
    SCH_ITEM* GetCurItem() const { return (SCH_ITEM*) BASE_SCREEN::GetCurItem(); }

    /**
     * Function SetCurItem
     * sets the currently selected object, m_CurrentItem.
     * @param aItem Any object derived from SCH_ITEM
     */
    void SetCurItem( SCH_ITEM* aItem ) { BASE_SCREEN::SetCurItem( (EDA_ITEM*) aItem ); }

    /**
     * Function Clear
     * deletes all draw items and clears the project settings.
     */
    void Clear();

    /**
     * Free all the items from the schematic associated with the screen.
     *
     * This does not delete any sub hierarchies.
     */
    void FreeDrawList();

    /**
     * Function GetItem
     * checks \a aPosition within a distance of \a aAccuracy for items of type \a aFilter.
     * @param aPosition Position in drawing units.
     * @param aAccuracy The maximum distance within \a Position to check for an item.
     * @param aType The type of item to find or #NOT_USED to find any item type.
     * @return The item found that meets the search criteria or NULL if none found.
     */
    SCH_ITEM* GetItem( const wxPoint& aPosition, int aAccuracy = 0,
                       KICAD_T aType = NOT_USED ) const;

    void Place( SCH_EDIT_FRAME* frame, wxDC* DC ) { };

    /**
     * Function Draw
     * draws all the items in the screen to \a aCanvas.
     * @param aCanvas The canvas item to draw on.
     * @param aDC The device context to draw on.
     * @param aDrawMode The drawing mode.
     * @param aColor The drawing color.
     */
    void Draw( EDA_DRAW_PANEL* aCanvas, wxDC* aDC, int aDrawMode, int aColor = -1 );

    /**
     * Function Plot
     * plots all the schematic objects to \a aPlotter.
     *
     * @param aPlotter The plotter object to plot to.
     */
    void Plot( PLOTTER* aPlotter );

    /**
     * Remove \a aItem from the schematic associated with this screen.
     *
     * @param aItem - Item to be removed from schematic.
     */
    void RemoveFromDrawList( SCH_ITEM* aItem );

    /**
     * Function DeleteItem
     * removes \a aItem from the linked list and deletes the object.  If \a aItem is
     * is a schematic sheet label, it is removed from the screen associated with the
     * sheet that contains the label to be deleted.
     * @param aItem The schematic object to be deleted from the screen.
     */
    void DeleteItem( SCH_ITEM* aItem );

    bool CheckIfOnDrawList( SCH_ITEM* st );

    void AddToDrawList( SCH_ITEM* st );

    /**
     * Function SchematicCleanUp
     * performs routine schematic cleaning including breaking wire and buses and
     * deleting identical objects superimposed on top of each other.
     *
     * @param aCanvas The window to draw on.
     * @param aDC The device context used for drawing to \a aCanvas.
     * @return True if any schematic clean up was performed.
     */
    bool SchematicCleanUp( EDA_DRAW_PANEL* aCanvas = NULL, wxDC* aDC = NULL );

    /**
     * Function TestDanglingEnds
     * tests all of the connectible objects in the schematic for unused connection points.
     * @param aDC - The device context to draw the dangling status indicators.
     * @param aCanvas - The window to draw on.
     * @return True if any dangling ends were found.
     */
    bool TestDanglingEnds( EDA_DRAW_PANEL* aCanvas = NULL, wxDC* aDC = NULL );

    /**
     * Function ExtractWires
     * extracts the old wires, junctions and buses.  If \a aCreateCopy is true, replace
     * them with a copy.  Old item must be put in undo list, and the new ones can be
     * modified by clean up safely.  If an abort command is made, old wires must be put
     * in GetDrawItems(), and copies must be deleted.  This is because previously stored
     * undo commands can handle pointers on wires or buses, and we do not delete wires or
     * buss-es, we must put they in undo list.
     *
     * Because cleanup delete and/or modify bus and wires, the it is easier is to put
     * all wires in undo list and use a new copy of wires for cleanup.
     */
    SCH_ITEM* ExtractWires( bool aCreateCopy );

    /**
     * Function ReplaceWires
     * replaces all of the wires and junction in the screen with \a aWireList.
     * @param aWireList List of wire to replace the existing wires with.
     */
    void ReplaceWires( SCH_ITEM* aWireList );

    /**
     * Function MarkConnections
     * add all wires and junctions connected to \a aSegment which are not connected any
     * component pin to \a aItemList.
     * @param aSegment The segment to test for connections.
     */
    void MarkConnections( SCH_LINE* aSegment );

    /**
     * Functions GetConnection
     * adds all of the wires and junctions to \a aList that make up a connection to the
     * object at \a aPosition.
     * @param aPosition The position of the first connection object in drawing units.
     * @param aList The pick list to add the connect item to.
     * @param aFullConnection If true all the objects that make up this connection are
     *                        add to \a aList.  Otherwise, only the objects up to the first
     *                        node are added.
     * @return The number of items added to \a aList.
     */
    int GetConnection( const wxPoint& aPosition, PICKED_ITEMS_LIST& aList, bool aFullConnection );

    /**
     * Function BreakSegment
     * checks every wire and bus for a intersection at \a aPoint and break into two segments
     * at \a aPoint if an intersection is found.
     * @param aPoint Test this point for an intersection.
     * @return True if any wires or buses were broken.
     */
    bool BreakSegment( const wxPoint& aPoint );

    /**
     * Function BreakSegmentsOnJunctions
     * tests all junctions and bus entries in the schematic for intersections with wires and
     * buses and breaks any intersections into multiple segments.
     * @return True if any wires or buses were broken.
     */
    bool BreakSegmentsOnJunctions();

    /* full undo redo management : */
    // use BASE_SCREEN::PushCommandToUndoList( PICKED_ITEMS_LIST* aItem )
    // use BASE_SCREEN::PushCommandToRedoList( PICKED_ITEMS_LIST* aItem )

    /**
     * Function ClearUndoORRedoList
     * free the undo or redo list from List element
     *  Wrappers are deleted.
     *  data pointed by wrappers are deleted if not in use in schematic
     *  i.e. when they are copy of a schematic item or they are no more in use (DELETED)
     * @param aList = the UNDO_REDO_CONTAINER to clear
     * @param aItemCount = the count of items to remove. < 0 for all items
     * items are removed from the beginning of the list.
     * So this function can be called to remove old commands
     */
    virtual void ClearUndoORRedoList( UNDO_REDO_CONTAINER& aList, int aItemCount = -1 );

    /**
     * Function Save
     * writes the data structures for this object out to \a aFile in "*.sch" format.
     *
     * @param aFile The FILE to write to.
     * @return bool - true if success writing else false.
     */
    bool Save( FILE* aFile ) const;

    /**
     * Clear the state flags of all the items in the screen.
     */
    void ClearDrawingState();

    int CountConnectedItems( const wxPoint& aPos, bool aTestJunctions ) const;

    /**
     * Function IsJunctionNeeded
     * tests if a junction is required for the items at \a aPosition on the screen.
     * <p>
     * A junction is required at \a aPosition if the following criteria are satisfied:
     * <ul>
     * <li>one wire midpoint, one or more wire endpoints and no junction.</li>
     * <li>three or more wire endpoints and no junction.</li>
     * <li>two wire midpoints and no junction</li>
     * <li>one wire midpoint, a component pin, and no junction.</li>
     * <li>three wire endpoints, a component pin, and no junction.</li>
     * </ul>
     * </p>
     * @param aPosition The position to test.
     * @return True if a junction is required at \a aPosition.
     */
    bool IsJunctionNeeded( const wxPoint& aPosition );

    /**
     * Function IsTerminalPoint
     * tests if \a aPosition is a connection point on \a aLayer.
     *
     * @param aPosition Position to test.
     * @param aLayer The layer type to test against.  Valid layer types are #LAYER_NOTES,
     *               #LAYER_BUS, and #LAYER_WIRE.
     * @return True if \a Position is a connection point on \a aLayer.
     */
    bool IsTerminalPoint( const wxPoint& aPosition, int aLayer );

    /**
     * Function GetPin
     * test the screen for a component pin item at \a aPosition.
     * @param aPosition Position to test.
     * @param aComponent The component if a pin was found, otherwise NULL.
     * @param aEndPointOnly Set to true to test if \a aPosition is the connection
     *                      point of the pin.
     * @return The pin item if found, otherwise NULL.
     */
    LIB_PIN* GetPin( const wxPoint& aPosition, SCH_COMPONENT** aComponent = NULL,
                     bool aEndPointOnly = false ) const;

    /**
     * Function GetSheet
     * returns a sheet object pointer that is named \a aName.
     *
     * @note The screen hierarchy is not descened.
     * @param aName is the case insensitive name of the sheet.
     * @return A pointer to the SCH_SHEET object found or NULL.
     */
    SCH_SHEET* GetSheet( const wxString& aName );

    /**
     * Function GetSheetLabel
     * test the screen if \a aPosition is a sheet label object.
     * @param aPosition The position to test.
     * @return The sheet label object if found otherwise NULL.
     */
    SCH_SHEET_PIN* GetSheetLabel( const wxPoint& aPosition );

    /**
     * Function ClearAnnotation
     * clears the annotation for the components in \a aSheetPath on the screen.
     * @param aSheetPath The sheet path of the component annotation to clear.  If NULL then
     *                   the entire hierarchy is cleared.
     */
    void ClearAnnotation( SCH_SHEET_PATH* aSheetPath );

    /**
     * Function GetHierarchicalItems
     * adds all schematic sheet and component object in the screen to \a aItems.
     * @param aItems Hierarchical item list to fill.
     */
    void GetHierarchicalItems( EDA_ITEMS& aItems );

    /**
     * Function GetNode
     * returns all the items at \a aPosition that form a node.
     *
     * @param aPosition The wxPoint to test for node items.
     * @param aList A #EDA_ITEMS container to place the items found.
     * @return The number of node items found at \a aPosition.
     */
    int GetNode( const wxPoint& aPosition, EDA_ITEMS& aList );

    /**
     * Function GetWireOrBus
     * returns a wire or bus item located at \a aPosition.
     *
     * @param aPosition The wxPoint to test for node items.
     * @return The SCH_LINE* of the wire or bus item found at \a aPosition or NULL if item not
     *         found.
     */
    SCH_LINE* GetWireOrBus( const wxPoint& aPosition );

    /**
     * Function GetLine
     * returns a line item located at \a aPosition.
     *
     * @param aPosition The wxPoint to test for a line item.
     * @param aAccuracy Amount to inflate the item hit test bounding box.
     * @param aLayer The layer the line is drawn upon.
     * @param aSearchType Additional line test criteria.
     * @return The SCH_LINE* of the wire item found at \a aPosition or NULL if item not
     *         found.
     */
    SCH_LINE* GetLine( const wxPoint& aPosition, int aAccuracy = 0, int aLayer = LAYER_NOTES,
                       SCH_LINE_TEST_T aSearchType = ENTIRE_LENGTH_T );

    SCH_LINE* GetWire( const wxPoint& aPosition, int aAccuracy = 0,
                       SCH_LINE_TEST_T aSearchType = ENTIRE_LENGTH_T )
    {
        return GetLine( aPosition, aAccuracy, LAYER_WIRE, aSearchType );
    }

    SCH_LINE* GetBus( const wxPoint& aPosition, int aAccuracy = 0,
                      SCH_LINE_TEST_T aSearchType = ENTIRE_LENGTH_T )
    {
        return GetLine( aPosition, aAccuracy, LAYER_BUS, aSearchType );
    }

    /**
     * Function GetLabel
     * returns a label item located at \a aPosition.
     *
     * @param aPosition The wxPoint to test for label items.
     * @param aAccuracy Amount to inflate the item hit test bounding box.
     * @return The SCH_TEXT* of the label item found at \a aPosition or NULL if item not
     *         found.
     */
    SCH_TEXT* GetLabel( const wxPoint& aPosition, int aAccuracy = 0 );

    /**
     * Function SetFootprintField
     * searches screen for a component with \a aReference and set the footprint field to
     * \a aFootPrint if found.
     *
     * @param aSheetPath The sheet path used to look up the reference designator.
     * @param aReference The reference designator of the component.
     * @param aFootPrint The value to set the footprint field.
     * @param aSetVisible The value to set the field visibility flag.
     * @return True if \a aReference was found otherwise false.
     */
    bool SetComponentFootprint( SCH_SHEET_PATH* aSheetPath, const wxString& aReference,
                                const wxString& aFootPrint, bool aSetVisible );

    /**
     * Function SelectBlockItems
     * creates a list of items found when a block command is initiated.  The items selected
     * depend on the block command.  If the drag block command is issued, than any items
     * connected to items in the block are also selected.
     */
    void SelectBlockItems();

    /**
     * Function UpdatePickList
     * adds all the items in the screen within the block selection rectangle to the pick list.
     * @return The number of items in the pick list.
     */
    int UpdatePickList();

    virtual void AddItem( SCH_ITEM* aItem ) { BASE_SCREEN::AddItem( (EDA_ITEM*) aItem ); }

    virtual void InsertItem(  EDA_ITEMS::iterator aIter, SCH_ITEM* aItem )
    {
        BASE_SCREEN::InsertItem( aIter, (EDA_ITEM*) aItem );
    }
};


/**
 * Class SCH_SCREENS
 * is a class to handle the list of *screens* in a hierarchy.
 */

// screens are unique, and correspond to .sch files.
class SCH_SCREENS
{
private:
    std::vector< SCH_SCREEN* > m_screens;
    unsigned int               m_index;

public:
    SCH_SCREENS();
    ~SCH_SCREENS();
    int GetCount() const { return m_screens.size(); }
    SCH_SCREEN* GetFirst();
    SCH_SCREEN* GetNext();
    SCH_SCREEN* GetScreen( unsigned int aIndex );

    /**
     * Function ClearAnnotation
     * clears the annotation for all components in the hierarchy.
     */
    void ClearAnnotation();

    /**
     * Function SchematicCleanUp
     * merges and breaks wire segments in the entire schematic hierarchy.
     */
    void SchematicCleanUp();

    /**
     * Function ReplaceDuplicateTimeStamps
     * test all sheet and component objects in the schematic for duplicate time stamps
     * an replaces them as necessary.  Time stamps must be unique in order for complex
     * hierarchies know which components go to which sheets.
     * @return The number of duplicate time stamps replaced.
     */
    int ReplaceDuplicateTimeStamps();

    /**
     * Function SetDate
     * sets the date string for every screen to \a aDate.
     * @see GetDate()
     * @param aDate The date string to set for each screen.
     */
    void SetDate( const wxString& aDate );

    /**
     * Function DeleteAllMarkers
     * deletes all electronic rules check markers of \a aMarkerType from all the screens in
     * the list.
     * @param aMarkerType Type of markers to be deleted.
     */
    void DeleteAllMarkers( int aMarkerType );

    /**
     * Function GetMarkerCount
     * returns the number of ERC markers of \a aMarkerType from all of the screens in the list.
     *
     * @param aMarkerType Indicates the type of marker to count.  A value less then zero
     *                    indicates all markers are counted.
     * @return int count of the markers found.
     */
    int GetMarkerCount( int aMarkerType = -1 );

private:
    void AddScreenToList( SCH_SCREEN* aScreen );
    void BuildScreenList( EDA_ITEM* aItem );
};

#endif /* CLASS_SCREEN_H */