Avoid potential negative array index access to cached text.

[LibreOffice.git] / include / editeng / unoedsrc.hxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_EDITENG_UNOEDSRC_HXX
#define INCLUDED_EDITENG_UNOEDSRC_HXX

#include <i18nlangtag/lang.h>
#include <rtl/ustring.hxx>
#include <tools/gen.hxx>
#include <tools/fontenum.hxx>
#include <vcl/mapmod.hxx>
#include <svl/poolitem.hxx>
#include <editeng/editengdllapi.h>
#include <editeng/editeng.hxx>

#include <vector>

struct ESelection;
struct EFieldInfo;
struct EBulletInfo;
class Color;
class OutputDevice;
class SfxItemSet;
class SvxTextForwarder;
class SvxViewForwarder;
class SvxEditViewForwarder;
class SvxFieldItem;
class SfxBroadcaster;
class SvxUnoTextRangeBase;

typedef std::vector< SvxUnoTextRangeBase* > SvxUnoTextRangeBaseVec;

/** Wrapper class for unified EditEngine/Outliner access

    This class wraps a textual object, which might or might not
    contain an EditEngine/Outliner. Is used e.g. for filling an
    EditEngine with the content of a cell, note page or page template.
*/
class EDITENG_DLLPUBLIC SvxEditSource
{
public:
    SvxEditSource() = default;
    SvxEditSource(SvxEditSource const &) = default;
    SvxEditSource(SvxEditSource &&) = default;
    SvxEditSource & operator =(SvxEditSource const &) = default;
    SvxEditSource & operator =(SvxEditSource &&) = default;

    virtual                 ~SvxEditSource();

    /// Returns a new reference to the same object. This is a shallow copy
    virtual std::unique_ptr<SvxEditSource> Clone() const = 0;

    /** Query the text forwarder

        @return the text forwarder, or NULL if the underlying object is dead
     */
    virtual SvxTextForwarder*   GetTextForwarder() = 0;

    /** Query the view forwarder

        @return the view forwarder, or NULL if the underlying object
        is dead, or if no view is available

        @derive default implementation provided, overriding is optional
     */
     virtual SvxViewForwarder*  GetViewForwarder();

    /** Query the edit view forwarder

        @param bCreate
        Determines whether an EditView should be created, if there is
        none active. If set to sal_True, and the underlying object is
        not in EditMode, the text forwarder changes and the object is
        set to EditMode.

        @return the edit view forwarder, or NULL if the underlying
        object is dead, or if no view is available (if bCreate is
        sal_False, NULL is also returned if the object is not in
        EditMode)

        @derive default implementation provided, overriding is optional

        @attention If this method is called with bCreate equal to
        sal_True, all previously returned text forwarder can become
        invalid
     */
    virtual SvxEditViewForwarder*  GetEditViewForwarder( bool bCreate = false );

    /// Write back data to model
    virtual void                UpdateData() = 0;

    /** Returns broadcaster the underlying edit engine's events are sent from

        @derive default implementation provided, overriding is optional
     */
    virtual SfxBroadcaster&     GetBroadcaster() const;

    /** adds the given SvxUnoTextRangeBase to the text object
        capsulated by this SvxEditSource. This allows the text
        object to inform all created text ranges about changes
        and also allows to re use already created instances.
        All SvxUnoTextRangeBase must remove itself with
        removeRange() before they are deleted. */
    virtual void addRange( SvxUnoTextRangeBase* pNewRange );

    /** removes the given SvxUnoTextRangeBase from the text
        object capsulated by this SvxEditSource. This text range
        will not be informed any longer of changes on the underlying
        text and will also not re used anymore. */
    virtual void removeRange( SvxUnoTextRangeBase* pOldRange );

    /** returns a const list of all text ranges that are registered
        for the underlying text object. */
    virtual const SvxUnoTextRangeBaseVec& getRanges() const;
};


/** Contains an EditEngine or an Outliner and unifies access to them.

    The EditEngine-UNO objects use this class only. To reflect changes
    not only in the EditEngine, but also in the model data, call
    SvxEditSource::UpdateData(). This copies back the data to the model's
    EditTextObject/OutlinerParaObject.
 */
class EDITENG_DLLPUBLIC SvxTextForwarder
{
public:
    virtual             ~SvxTextForwarder() COVERITY_NOEXCEPT_FALSE;

    virtual sal_Int32   GetParagraphCount() const = 0;
    virtual sal_Int32   GetTextLen( sal_Int32 nParagraph ) const = 0;
    virtual OUString    GetText( const ESelection& rSel ) const = 0;
    virtual SfxItemSet  GetAttribs( const ESelection& rSel, EditEngineAttribs nOnlyHardAttrib = EditEngineAttribs::All ) const = 0;
    virtual SfxItemSet  GetParaAttribs( sal_Int32 nPara ) const = 0;
    virtual void        SetParaAttribs( sal_Int32 nPara, const SfxItemSet& rSet ) = 0;
    virtual void        RemoveAttribs( const ESelection& rSelection ) = 0;
    virtual void        GetPortions( sal_Int32 nPara, std::vector<sal_Int32>& rList ) const = 0;

    virtual OUString    GetStyleSheet(sal_Int32 nPara) const = 0;
    virtual void        SetStyleSheet(sal_Int32 nPara, const OUString& rStyleName) = 0;

    virtual SfxItemState    GetItemState( const ESelection& rSel, sal_uInt16 nWhich ) const = 0;
    virtual SfxItemState    GetItemState( sal_Int32 nPara, sal_uInt16 nWhich ) const = 0;

    virtual void        QuickInsertText( const OUString& rText, const ESelection& rSel ) = 0;
    virtual void        QuickInsertField( const SvxFieldItem& rFld, const ESelection& rSel ) = 0;
    virtual void        QuickSetAttribs( const SfxItemSet& rSet, const ESelection& rSel ) = 0;
    virtual void        QuickInsertLineBreak( const ESelection& rSel ) = 0;

    virtual OUString    CalcFieldValue( const SvxFieldItem& rField, sal_Int32 nPara, sal_Int32 nPos, std::optional<Color>& rpTxtColor, std::optional<Color>& rpFldColor, std::optional<FontLineStyle>& rpFldLineStyle ) = 0;
    virtual void        FieldClicked( const SvxFieldItem& rField ) = 0;

    virtual SfxItemPool* GetPool() const = 0;

    virtual const SfxItemSet*   GetEmptyItemSetPtr() = 0;

    // implementation functions for XParagraphAppend and XTextPortionAppend
    virtual void        AppendParagraph() = 0;
    virtual sal_Int32   AppendTextPortion( sal_Int32 nPara, const OUString &rText, const SfxItemSet &rSet ) = 0;

    // XTextCopy
    virtual void        CopyText(const SvxTextForwarder& rSource) = 0;

    /** Query state of forwarder

        @return false, if no longer valid
     */
    virtual bool       IsValid() const = 0;

    /** Query language of character at given position on the underlying edit engine

        @param nPara[0 .. n-1]
        Index of paragraph to query language in

        @param nIndex[0 .. m-1]
        Index of character to query language of
     */
    virtual LanguageType    GetLanguage( sal_Int32 nPara, sal_Int32 nIndex ) const = 0;

    /** Query number of fields in the underlying edit engine

        @param nPara[0 .. n-1]
        Index of paragraph to query field number in
     */
    virtual sal_Int32          GetFieldCount( sal_Int32 nPara ) const = 0;

    /** Query information for given field number in the underlying edit engine

        @param nPara[0 .. n-1]
        Index of paragraph to query field info in

        @param nField[0 .. m-1]
        Index of field to query information of
     */
    virtual EFieldInfo      GetFieldInfo( sal_Int32 nPara, sal_uInt16 nField ) const = 0;

    /** Query information regarding bullets for given paragraph on the underlying edit engine

        @param nPara[0 .. n-1]
        Index of paragraph to query bullet info on
     */
    virtual EBulletInfo     GetBulletInfo( sal_Int32 nPara ) const = 0;

    /** Query the bounding rectangle of the given character

        @param nPara[0 .. n]
        Index of paragraph to query the bounds in.  <p>The virtual
        character after the last character of the represented text,
        i.e. the one at position n is a special case.  Because it does
        not represent an existing character its bounding box is
        defined in relation to preceding characters.  It should be
        roughly equivalent to the bounding box of some character when
        inserted at the end of the text.  Its height typically being
        the maximal height of all the characters in the text or the
        height of the preceding character, its width being at least
        one pixel so that the bounding box is not degenerate.<br>

        @param nIndex[0 .. m-1]
        Index of character to query the bounds of

        @return rectangle in logical coordinates, relative to upper
        left corner of text. The coordinates returned here are to be
        interpreted in the map mode given by GetMapMode().
    */
    virtual tools::Rectangle       GetCharBounds( sal_Int32 nPara, sal_Int32 nIndex ) const = 0;

    /** Query the bounding rectangle of the given paragraph

        @param nPara[0 .. n-1]
        Index of paragraph to query the bounds of

        @return rectangle in logical coordinates, relative to upper
        left corner of text. The coordinates returned here are to be
        interpreted in the map mode given by GetMapMode().
     */
    virtual tools::Rectangle       GetParaBounds( sal_Int32 nPara ) const = 0;

    /** Query the map mode of the underlying EditEngine/Outliner

        @return the map mode used on the EditEngine/Outliner. The
        values returned by GetParaBounds() and GetCharBounds() are to
        be interpreted in this map mode, the point given to
        GetIndexAtPoint() is interpreted in this map mode.
     */
    virtual MapMode         GetMapMode() const = 0;

    /** Query the reference output device of the underlying EditEngine/Outliner

        @return the OutputDevice used from the EditEngine/Outliner to
        format the text. It should be used when performing e.g. font
        calculations, since this is usually a printer with fonts and
        resolution different from the screen.
     */
    virtual OutputDevice*   GetRefDevice() const = 0;

    /** Query paragraph and character index of the character at the
        given point. Returns sal_True on success, sal_False otherwise

        @param rPoint
        Point to query text position of. Is interpreted in logical
        coordinates, relative to the upper left corner of the text, and
        in the map mode given by GetMapMode()

        @param rPara[0 .. n-1]
        Index of paragraph the point is within

        @param rIndex[0 .. m-1]
        Index of character the point is over

        @return true, if the point is over any text and both rPara and rIndex are valid

     */
    virtual bool            GetIndexAtPoint( const Point& rPoint, sal_Int32& rPara, sal_Int32& rIndex ) const = 0;

    /** Get the start and the end index of the word at the given index

        An index value on a word leads from the first character of
        that word up to and including the last space before the next
        word. The index values returned do not contain any leading or
        trailing white-space. If the input indices are invalid,
        sal_False is returned.

        @param nPara[0 .. n-1]
        Index of paragraph to start the search in

        @param nIndex[0 .. m-1]
        Index of character to query the search on

        @param rStart
        Start index (in the same paragraph)

        @param rEnd
        End index (in the same paragraph), this point to the last
        character still contained in the query

        @return true, if the result is non-empty
     */
    virtual bool             GetWordIndices( sal_Int32 nPara, sal_Int32 nIndex, sal_Int32& rStart, sal_Int32& rEnd ) const = 0;

    /** Query range of similar attributes

        Please note that the range returned is half-open: [nStartIndex,nEndIndex)

        @param nStartIndex
        Herein, the start index of the range of similar attributes is returned

        @param nEndIndex
        Herein, the end index (exclusive) of the range of similar attributes is returned

        @param nIndex
        The character index from which the range of similar attributed characters is requested

        @return true, if the range has been successfully determined
     */
    virtual bool               GetAttributeRun( sal_Int32& nStartIndex, sal_Int32& nEndIndex, sal_Int32 nPara, sal_Int32 nIndex, bool bInCell = false ) const = 0;

    /** Query number of lines in the formatted paragraph

        @param nPara[0 .. n-1]
        Index of paragraph to query number of lines in

        @return number of lines in given paragraph

     */
    virtual sal_Int32          GetLineCount( sal_Int32 nPara ) const = 0;

    /** Query line length

        @param nPara[0 .. n-1]
        Index of paragraph to query line length in

        @param nLine[0 .. m-1]
        Index of line in paragraph to query line length of

     */
    virtual sal_Int32         GetLineLen( sal_Int32 nPara, sal_Int32 nLine ) const = 0;

    /** Query bounds of line in paragraph

        @param rStart [output param; 0 .. text_len]
        The index in the paragraph text that belongs to the chara at the start of the line

        @param rEnd [output param; 0 .. text_len]
        The index in the paragraph text that follows the last chara in the line

        @param nParagraph[0 .. n-1]
        Index of paragraph to query line length in

        @param nLine[0 .. m-1]
        Index of line in paragraph to query line length of

     */
    virtual void            GetLineBoundaries( /*out*/sal_Int32 &rStart, /*out*/sal_Int32 &rEnd, sal_Int32 nParagraph, sal_Int32 nLine ) const = 0;

    /** Query the line number for an index in the paragraphs text

        @param nPara[0 .. n-1]
        Index of paragraph to query line length in

        @param nIndex[0 .. m-1]
        Index of the char in the paragraph text

        @returns [0 .. k-1]
        The line number of the char in the paragraph
     */
    virtual sal_Int32          GetLineNumberAtIndex( sal_Int32 nPara, sal_Int32 nIndex ) const = 0;

    /** Delete given text range and reformat text

        @param rSelection
        The text range to be deleted

        @return true if text has been successfully deleted
     */
    virtual bool            Delete( const ESelection& rSelection ) = 0;

     /** Insert/Replace given text in given range and reformat text

          @param rText
         Text to insert/replace

         @param rSel
         Selection where text should be replaced. The empty selection inserts

         @return true if text has been successfully inserted
      */
    virtual bool            InsertText( const OUString& rText, const ESelection& rSel ) = 0;

     /** Updates the formatting

          @see EditEngine::QuickFormatDoc() for details

         @return true if text have been successfully reformatted
      */
    virtual bool            QuickFormatDoc( bool bFull = false ) = 0;

    /** Get the outline depth of given paragraph

        @param nPara
        Index of the paragraph to query the depth of

        @return the outline level of the given paragraph. The range is
        [0,n), where n is the maximal outline level.
     */
    virtual sal_Int16       GetDepth( sal_Int32 nPara ) const = 0;

    /** Set the outline depth of given paragraph

        @param nPara
        Index of the paragraph to set the depth of

        @param nNewDepth
        The depth to set on the given paragraph. The range is
        [0,n), where n is the maximal outline level.

        @return true, if depth could be successfully set. Reasons for
        failure are e.g. the text does not support outline level
        (EditEngine), or the depth range is exceeded.
     */
    virtual bool            SetDepth( sal_Int32 nPara, sal_Int16 nNewDepth ) = 0;

    virtual sal_Int32 GetNumberingStartValue( sal_Int32 nPara );
    virtual void SetNumberingStartValue( sal_Int32 nPara, sal_Int32 nNumberingStartValue );

    virtual bool IsParaIsNumberingRestart( sal_Int32 nPara );
    virtual void SetParaIsNumberingRestart( sal_Int32 nPara, bool bParaIsNumberingRestart );
};

/** Encapsulates the document view for the purpose of unified
    EditEngine/Outliner access.

    This one has to be different from the SvxEditViewForwarder, since
    the latter is only valid in edit mode.
 */
class EDITENG_DLLPUBLIC SvxViewForwarder
{
public:
    virtual             ~SvxViewForwarder();

    /** Query state of forwarder

        @return sal_False, if no longer valid
     */
    virtual bool        IsValid() const = 0;

    /** Convert from logical, EditEngine-relative coordinates to screen coordinates

        @param rPoint
        Point in logical, EditEngine-relative coordinates.

        @param rMapMode
        The map mode to interpret the coordinates in.

        @return the point in screen coordinates
     */
    virtual Point       LogicToPixel( const Point& rPoint, const MapMode& rMapMode ) const = 0;

    /** Convert from screen to logical, EditEngine-relative coordinates

        @param rPoint
        Point in screen coordinates

        @param rMapMode
        The map mode to interpret the coordinates in.

        @return the point in logical coordinates.
     */
    virtual Point       PixelToLogic( const Point& rPoint, const MapMode& rMapMode ) const = 0;

};


/** Encapsulates EditView and OutlinerView for the purpose of unified
    EditEngine/Outliner access
 */
class SvxEditViewForwarder : public SvxViewForwarder
{
public:

    /** Query current selection.

        @param rSelection
        Contains the current selection after method call

        @return false, if there is no view or no selection (the empty selection _is_ a selection)

     */
    virtual bool GetSelection( ESelection& rSelection ) const = 0;

    /** Set selection in view.

        @param rSelection
        The selection to set

        @return false, if there is no view or selection is invalid
     */
    virtual bool SetSelection( const ESelection& rSelection ) = 0;

    /** Copy current selection to clipboard.

        @return false if no selection or no view (the empty selection _is_ a selection)
     */
    virtual bool Copy() = 0;

    /** Cut current selection to clipboard.

        @return false if no selection or no view (the empty selection _is_ a selection)
     */
    virtual bool Cut() = 0;

    /** Paste clipboard into current selection.

        @return false if no view or no selection (the empty selection _is_ a selection)
     */
    virtual bool Paste() = 0;

};

#endif

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