1 files changed, 577 insertions, 0 deletions
diff --git a/ksirc/kstextview.h b/ksirc/kstextview.h
new file mode 100644
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--- /dev/null
+++ b/ksirc/kstextview.h
@@ -0,0 +1,577 @@
+/* This file is part of the KDE project
+   Copyright (C) 2001 Simon Hausmann <hausmann@kde.org>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+#ifndef __kstextview_h__
+#define __kstextview_h__
+
+#include <qscrollview.h>
+#include <qpen.h>
+#include <qptrlist.h>
+#include <qvaluelist.h>
+#include <qmap.h>
+#include <qpixmap.h>
+
+class QTimer;
+class QDragObject;
+
+namespace KSirc
+{
+
+class TextView;
+
+struct StringPtr
+{
+    StringPtr() : ptr( 0 ), len( 0 ) {}
+    StringPtr( const QChar *_ptr, uint _len )
+        : ptr( _ptr ), len( _len ) {}
+    explicit StringPtr( const QString &s ) // use with care!
+        : ptr( s.unicode() ), len( s.length() ) {}
+
+    inline bool isNull() const { return ptr == 0; }
+
+    // makes deep copy
+    inline QString toQString() const 
+    { return ( ptr && len > 0 ) ? QString( ptr, len ) : QString::null; }
+
+    const QChar *ptr;
+    uint len;
+};
+
+#define CONSTSTRING( substr ) QConstString( substr.ptr, substr.len ).string()
+
+inline bool operator<( const StringPtr &s1, const StringPtr &s2 )
+{
+    return CONSTSTRING( s1 ) < CONSTSTRING( s2 );
+}
+
+inline bool operator==( const StringPtr &s1, const StringPtr &s2 )
+{
+    return CONSTSTRING( s1 ) == CONSTSTRING( s2 );
+}
+
+inline bool operator==( const StringPtr &s1, const char *s2 )
+{
+    return CONSTSTRING( s1 ) == s2;
+}
+
+class AttributeMap : public QMap<StringPtr, StringPtr>
+{
+public:
+    AttributeMap() {}
+    AttributeMap( const AttributeMap &rhs ) : QMap<StringPtr, StringPtr>( rhs ) {}
+    AttributeMap &operator=( const AttributeMap &rhs )
+    { QMap<StringPtr, StringPtr>::operator=( rhs ); return *this; }
+
+    // helper for 'const char *' key...
+    ConstIterator findAttribute( const char *key ) const
+    {
+        QString qkey( key );
+        return find( StringPtr( qkey ) );
+    }
+    Iterator findAttribute( const char *key ) 
+    {
+        QString qkey( key );
+        return find( StringPtr( qkey ) );
+    }
+
+    StringPtr operator[]( const char *key ) const
+    {
+        ConstIterator it = findAttribute( key );
+        if ( it == end() )
+            return StringPtr();
+        return it.data();
+    }
+    StringPtr &operator[]( const StringPtr &key )
+    {
+        return QMap<StringPtr, StringPtr>::operator[]( key );
+    }
+};
+
+struct Token
+{
+    Token() : id( -1 ) {}
+
+    enum Id { TagOpen, Text, TagClose };
+    int id;
+    StringPtr value;
+    AttributeMap attributes;
+};
+
+struct ItemProperties
+{
+    ItemProperties();
+    ItemProperties( const QFont &defaultFont );
+    ItemProperties( const ItemProperties &other,
+                    const Token &token,
+		    TextView *textView );
+    ItemProperties( const ItemProperties &rhs );
+    ItemProperties &operator=( const ItemProperties &rhs );
+
+    void updateFont( const QFont &newFont );
+
+    // these three are inherited/merged
+    QFont font;
+    QColor color;
+    QColor selColor;
+    QColor bgColor;
+    QColor bgSelColor;
+    bool reversed;
+    // ### todo: inherit these, too
+    AttributeMap attributes;
+};
+
+class TextParag;
+class TextLine;
+class SelectionPoint;
+
+class Item
+{
+public:
+    enum LayoutResetStatus { DeleteItem, KeepItem };
+    enum SelectionStatus { SelectionStart = 0, InSelection, SelectionEnd, SelectionBoth, 
+                           NoSelection };
+    enum SelectionAccuracy { SelectExact, SelectFuzzy };
+
+    Item( TextParag *parag, const ItemProperties &props = ItemProperties() );
+
+    virtual ~Item();
+
+    virtual const char *type() { return "Item"; }
+
+    virtual void paint( QPainter &painter ) = 0;
+
+    int width() const;
+
+    int minWidth() const;
+
+    int height() const;
+
+    virtual Item *breakLine( int width );
+
+    virtual LayoutResetStatus resetLayout() = 0;
+
+    virtual int calcSelectionOffset( int x );
+
+    void setSelectionStatus( SelectionStatus status ) { m_selection = status; }
+
+    SelectionStatus selectionStatus() const { return m_selection; }
+
+    void selectionOffsets( int &startOffset, int &endOffset );
+
+    int maxSelectionOffset() const;
+
+    void setLine(TextLine *line);
+
+    // ###
+    virtual StringPtr text() const;
+
+    virtual void setProps( const ItemProperties &props );
+    ItemProperties &props() { return m_props; }
+
+    static Item *create( TextParag *parag, const Token &tok, 
+                         const ItemProperties &props = ItemProperties() );
+
+protected:
+    mutable bool m_extendsDirty;
+    mutable int m_minWidth;
+    mutable int m_width;
+    mutable int m_height;
+
+    virtual void calcExtends() const = 0;
+
+    SelectionStatus m_selection;
+    TextLine  *m_line;
+    TextParag *m_parag;
+    ItemProperties m_props;
+};
+
+class TextChunk : public Item
+{
+public:
+    TextChunk( TextParag *parag, const StringPtr &text, const ItemProperties &props );
+
+    virtual const char *type() { return "TextChunk"; }
+
+    virtual void paint( QPainter &painter );
+
+    virtual Item *breakLine( int width );
+
+    virtual LayoutResetStatus resetLayout();
+
+    virtual int calcSelectionOffset( int x );
+
+    virtual StringPtr text() const;
+
+    virtual void setProps( const ItemProperties &props );
+
+protected:
+    virtual void calcExtends() const;
+
+private:
+    StringPtr breakInTheMiddle( int width );
+    Item *hardBreak( const StringPtr &rightHandSide );
+
+    void paintSelection( QPainter &p );
+    int paintSelection( QPainter &p, int x, const StringPtr &text );
+    int paintText( QPainter &p, int x, const StringPtr &text );
+
+    void mergeSelection( TextChunk *child, SelectionPoint *selection );
+
+    StringPtr m_text;
+    uint m_originalTextLength;
+    QFontMetrics m_metrics;
+    class TextChunk *m_parent;
+};
+
+class ImageItem : public Item
+{
+public:
+    ImageItem( TextParag *parag, const QPixmap &pixmap );
+
+    virtual const char *type() { return "Image"; }
+
+    virtual void paint( QPainter &painter );
+
+    virtual LayoutResetStatus resetLayout();
+
+protected:
+    virtual void calcExtends() const;
+
+private:
+    QPixmap m_pixmap;
+};
+
+class Tokenizer
+{
+public:
+    struct TagIndex
+    {
+        enum Type { Open, Close };
+        TagIndex() : index( 0 ), type( -1 ) {}
+        TagIndex( int _index, int _type )
+            : index( _index ), type( _type ) {}
+        uint index;
+        int type;
+    };
+    typedef QValueList<TagIndex> TagIndexList;
+ 
+    // preprocessed string
+    struct PString
+    {
+        QString data;
+        TagIndexList tags;
+    };
+    
+    Tokenizer( PString &text );
+
+    static PString preprocess( const QString &richText );
+
+    static QString convertToRichText( const PString &ptext );
+
+    bool parseNextToken( Token &tok );
+
+private:
+    void parseTag( const StringPtr &text,
+                   StringPtr &tag,
+                   AttributeMap &attributes );
+
+    static TagIndexList scanTagIndices( const QString &text );
+    static void resolveEntities( QString &text, TagIndexList &tags );
+
+    enum TagParsingState { ScanForName, ScanForEqual, ScanForValue };
+    
+    QString &m_text;
+    TagIndexList m_tags;
+    TagIndexList::ConstIterator m_lastTag;
+    bool m_textBeforeFirstTagProcessed;
+    bool m_done;
+
+    Tokenizer( const Tokenizer & );
+    Tokenizer &operator=( const Tokenizer & );
+};
+
+class SelectionPoint;
+
+class TextLine
+{
+public:
+    enum LayoutPolicy { NoUpdate, UpdateMaxHeight };
+
+    TextLine();
+    // tranfers ownership of items! make sure that 'items' does not
+    // have autodeletion enabled!
+    TextLine( const QPtrList<Item> &items );
+
+    int maxHeight() const { return m_maxHeight; }
+
+    QString updateSelection( const SelectionPoint &start, const SelectionPoint &end );
+    void clearSelection();
+
+    // transfers ownership
+    void appendItem( Item *i, int layoutUpdatePolicy = NoUpdate );
+
+    bool isEmpty() const { return m_items.isEmpty(); }
+
+    Item *resetLayout( QPtrList<Item> &remainingItems);
+
+    void paint( QPainter &p, int y );
+
+    Item *itemAt( int px, SelectionPoint *selectionInfo, 
+                  Item::SelectionAccuracy accuracy = Item::SelectExact );
+
+    QPtrListIterator<Item> iterator() const { return QPtrListIterator<Item>( m_items ); }
+
+    QString plainText() const;
+
+    void fontChange( const QFont &newFont );
+
+private:
+    QPtrList<Item> m_items;
+    int m_maxHeight;
+};
+
+class SelectionPoint;
+
+class TextParag
+{
+public:
+    TextParag( TextView *textView, const QString &richText );
+    
+    ~TextParag();
+
+    void layout( int width );
+
+    void paint( QPainter &p, int y, int maxY );
+
+    inline void setLayouted( bool l ) { m_layouted = l; }
+    inline bool isLayouted() const { return m_layouted; }
+
+    inline int minWidth() const { return m_minWidth; }
+    inline int height() const { return m_height; }
+
+    Item *itemAt( int px, int py, SelectionPoint *selectionInfo,
+                  Item::SelectionAccuracy accuracy = Item::SelectExact );
+
+    TextView *textView() const { return m_textView; }
+
+    QString updateSelection( const SelectionPoint &start, const SelectionPoint &end );
+
+    void clearSelection();
+
+    void setRichText( const QString &richText );
+
+    Tokenizer::PString processedRichText() const { return m_processedRichText; }
+
+    QString plainText() const;
+
+    void fontChange( const QFont &newFont );
+
+private:
+    Tokenizer::PString m_processedRichText;
+    QPtrList<TextLine> m_lines;
+    bool m_layouted;
+    int m_height;
+    int m_minWidth;
+    TextView *m_textView;
+
+    struct Tag
+    {
+        Tag() {}
+        Tag( const StringPtr &_name, const ItemProperties &_props )
+            : name( _name ), props( _props ) {}
+
+        StringPtr name;
+        ItemProperties props;
+    };
+
+    TextParag( const TextParag & );
+    TextParag &operator=( const TextParag & );
+};
+
+struct SelectionPoint
+{
+    SelectionPoint() : item( 0 ), line( 0 ), parag( 0 ), offset( 0 ) {}
+    Item *item;
+    TextLine *line;
+    TextParag *parag;
+    uint offset;
+    QPoint pos;
+};
+
+class TextParagIterator
+{
+    friend class TextView;
+public:
+    TextParagIterator( const TextParagIterator &rhs )
+        : m_paragIt( rhs.m_paragIt ) {}
+    TextParagIterator &operator=( const TextParagIterator &rhs )
+    { m_paragIt = rhs.m_paragIt; return *this; }
+
+    QString richText() const;
+    void setRichText( const QString &richText );
+
+    QString plainText() const;
+
+    bool atEnd() const { return m_paragIt.current() == 0; }
+
+    TextParagIterator &operator++() { ++m_paragIt; return *this; }
+    TextParagIterator &operator++( int steps ) { m_paragIt += steps; return *this; }
+    TextParagIterator &operator--() { --m_paragIt; return *this; }
+    TextParagIterator &operator--( int steps ) { m_paragIt -= steps; return *this; }
+
+protected:
+    TextParagIterator( const QPtrListIterator<TextParag> &paragIt )
+        : m_paragIt( paragIt ) {}
+
+private:
+    QPtrListIterator<TextParag> m_paragIt;
+};
+
+class ContentsPaintAlgorithm
+{
+public:
+    ContentsPaintAlgorithm( const QPtrListIterator<TextParag> &paragIt,
+                            QWidget *viewport, QPixmap &paintBuffer,
+                            QPainter &painter, int clipX, int clipY, int clipHeight );
+
+    void paint();
+
+private:
+    int goToFirstVisibleParagraph();
+    int paint( QPainter &bufferedPainter, int currentY );
+    int adjustYAndIterator( int startY, int currentY, int nextY );
+
+    QPtrListIterator<TextParag> m_paragIt;
+    QWidget *m_viewport;
+    QPixmap &m_paintBuffer;
+    QPainter &m_painter;
+    int m_clipX, m_clipY, m_clipHeight;
+    int m_overshoot;
+};
+
+class TextView : public QScrollView
+{
+    Q_OBJECT
+    friend class Item;
+    friend class TextChunk;
+    friend class TextParag;
+    friend class TextParagIterator;
+public:
+    TextView( QWidget *parent, const char *name  = 0 );
+    virtual ~TextView();
+
+    virtual void clear();
+
+    TextParagIterator appendParag( const QString &richText );
+    
+    bool removeParag( const TextParagIterator &parag );
+
+    void clearSelection( bool repaint = false ); // ### re-consider the repaint arg...
+
+    QString selectedText() const { return m_selectedText; }
+
+    TextParagIterator firstParag() const;
+
+    QString plainText() const;
+
+    QColor linkColor() const;
+    void setLinkColor( const QColor &linkColor );
+
+    void scrollToBottom( bool force = false );
+
+signals:
+    void selectionChanged();
+    void pasteReq(const QString&);
+    void linkClicked( const QMouseEvent *ev, const QString &url );
+
+public slots:
+    void copy();
+
+protected slots:
+    void scrolling(int value);
+
+protected:
+    virtual void viewportResizeEvent( QResizeEvent *ev );
+    virtual void drawContents( QPainter *p, int cx, int cy, int cw, int ch );
+    virtual void contentsMousePressEvent( QMouseEvent *ev );
+    virtual void contentsMouseMoveEvent( QMouseEvent *ev );
+    virtual void contentsMouseReleaseEvent( QMouseEvent *ev );
+    virtual void fontChange( const QFont & );
+
+    virtual void startDrag();
+
+    virtual QDragObject *dragObject( const QString &dragURL );
+
+private slots:
+    void autoScroll();
+
+private:
+    void emitLinkClickedForMouseEvent( QMouseEvent *ev );
+
+    void startAutoScroll();
+
+    void stopAutoScroll();
+
+    void selectionOffsets( int &startOffset, int &endOffset );
+
+    void updateSelectionOrder();
+
+    QString updateSelection( const SelectionPoint &start, const SelectionPoint &end );
+
+    SelectionPoint *selectionStart();
+    SelectionPoint *selectionEnd();
+
+    void layout( bool force = true );
+
+    Item *itemAt( const QPoint &pos, SelectionPoint *selectionInfo = 0,
+                  Item::SelectionAccuracy accuracy = Item::SelectExact );
+
+    void clearSelectionInternal();
+
+    void contentsChange(int heightChange, bool force = false);
+
+    QPtrList<TextParag> m_parags;
+    QPixmap m_paintBuffer;
+
+    SelectionPoint m_selectionMaybeStart;
+    SelectionPoint m_selectionStart;
+    SelectionPoint m_selectionEnd;
+    bool m_selectionEndBeforeStart;
+
+    QTimer *m_autoScrollTimer;
+
+    QString m_selectedText;
+
+    QPoint m_dragStartPos;
+    QString m_dragURL;
+    bool m_mousePressed : 1;
+    bool m_mmbPressed : 1;
+    QColor m_linkColor;
+    QColor m_selectionBackgroundColor;
+
+    int m_height;
+    bool m_inScroll;
+    int m_lastScroll;
+};
+
+} // namespace KSirc
+
+#endif
+/*
+ * vim: et sw=4
+ */