Language/OS - Multiplatform Resource Library/LANGUAGE OS.iso/et/et3_0-a1.lha/et3/src/TextView.h

C/C++ Source or Header | 1992-06-10 | 6KB | 203 lines

#ifndef TextView_First
#ifdef __GNUG__
//pragma once
#pragma interface
#endif
#define TextView_First

#include "StaticTView.h"

class FindDialog;
class TypingCommand;

const int cMaxBatchedIns = 80; // maximum number of batched inserts

struct SelPoint {
    int ch;         // char number of a selection point
    int line;       // line number of a selection
    Point viewp;    // position in view coordinates
    bool IsEqual(const SelPoint &s2);
};

void SwapSelPoints(SelPoint &p1, SelPoint &p2);

//---- TextView -------------------------------------------------------------

class TextView: public StaticTextView {
friend class RangeSelector;
friend class ExtendRangeSelector;
public:
    MetaDef(TextView);

    TextView(
    EvtHandler *eh, Rectangle r, Text *t,
    bool wrap= cWordWrap,
    TextViewFlags= eTextViewDefault,
    Point border= gBorder,
    TViewAlign ta= eTViewLeft,
    int id= cIdNone
    );  // if contentRect.extent.y is set to cVariableSize
    // extent.y is adapted to extent of largest text line

    ~TextView();
    void InitNew();

    void Draw(Rectangle);
    void Invert(int from, Point fp, int to, Point tp);
    void HighlightSelection(HighlightState hs);
    void RepairAll();

    //---- controller methods
    bool KbdFocus(bool in);
    void SetKeyMap(int *map);
    Command *DoLeftButtonDownCommand(Point, Token, int);
    Command *DoKeyCommand(int, Token);
    Command *DoCursorKeyCommand(EvtCursorDir, Token);

    //---- menu handling
    static Menu *MakeMenu(int menuId);
    void DoSetupMenu(class Menu *);
    void SetupEditMenu(Menu *m);
    void SetupSizeMenu(Menu *m);
    void SetupFontMenu(Menu *m);
    void SetupViewMenu(Menu *m);
    void SetupCharStyleMenu(Menu *m);
    void SetupFormatMenu(Menu *m);
    Command *DoMenuCommand(int);

    void SetStopChars(char *stopChars);
    // define in a string a list of characters that should not be
    // batched in DoKeyCommand. Has to be used when DoKeyCommand
    // is overridden to intercept carriage returns for instance
    const char *GetStopChars();

    Command *InsertText(Text *insert);
    Command *InsertString(byte *insert, int len= -1);

    void Enable(bool b= TRUE, bool redraw= TRUE);
    GrCursor GetCursor(Point);

    //---- selection ----
    void InvalidateSelection();
    void SetSelection(int s= 0, int e= cMaxInt, bool redraw= TRUE);
    void ClearSelection(bool redraw= TRUE);
    void SetDragAndDrop(bool on);
    void GetSelection(int *s, int *e);
    void SelectionAsString(byte *, int max);
    Text *SelectionAsText();
    Rectangle SelectionRect();
    Rectangle BoundingRect(int from, int to);
    void RevealSelection();
    bool InTextSelector()
    { return inTextSelector; }
    virtual void Home();
    virtual void Bottom();
    bool Caret();
    bool AnySelection();
    virtual void SelectAll(bool redraw= TRUE);
    virtual void DrawCaret(Point p, int line, HighlightState);

    void ShowSelection(bool redraw= TRUE, bool show= TRUE);
    bool CanShowSelection();

    //---- clipboard --------------------
    bool HasSelection();
    Command *PasteData(class Data*);
    bool CanPaste(Data *data);

    //---- editing and screen update
    virtual void Cut();
    virtual void DelChar(int n=1);
    virtual bool DeleteRequest(int from, int to);
    // called before deleting the text in the range from, to
    // a return value of FALSE indicates a veto, and the text will not be
    // deleted
    virtual void Copy(Text *save);
    virtual void Paste(Text *insert);
    Text *SetText(Text *, bool scroll= cRevealTop);     // returns old text
    void SetString(byte *str, int len= -1);
    CharStyle *GetCharStyle();

    void SetReadOnly(bool);
    bool GetReadOnly();

    //---- searching
    // virtual FindDialog *MakeFindDialog();
    virtual bool SelectRegExpr(class RegularExp *rex, bool forward= TRUE);

    //----- Command Notification
    void DoneTyping();  // notify typeing command
    void TypingDeleted(TypingCommand *typing);
    virtual TypingCommand *MakeTypingCommand(int cmdNo, char *name);

    //----- change notification from the text object
    void DoObserve(int, int part, void*, Object *op);
    bool PrintOnWhenObserving(Object *from);

    //---- activation passivation ----------------------------------------------
    IStream& ReadFrom(IStream&);

protected:
    class Text *scratchText;
    bool updateSelection;

    //---- selection
    SelPoint start, end;            // selection range

    void NormSelection();
    // normalize selection, establisch start < end
    void PrivSetSelection(int s, int e, bool redraw= TRUE);
    void PrivSetSelection(SelPoint s, SelPoint e, bool redraw= TRUE);
    void Init();
    bool Writeable();
    virtual int CursorPos(int ch, int line, EvtCursorDir d, Point);

private:
    bool inTextSelector;
    bool enabled, active;
    char *stopChars; // these characters wont be batched during DoKeyCommand              // if DoKeyCommand is overriden
    TypingCommand *typing; // current typeing command object
    FindDialog *findChange;

};

//---- inlines -----------------------------------------------------------------

inline bool SelPoint::IsEqual(const SelPoint &s2)
{
    return (bool) (ch == s2.ch);
}

inline bool TextView::Caret()
{
    return (bool) (start.ch == end.ch);
}

inline bool TextView::AnySelection()
{
    return (bool) (start.ch != -1);
}

inline bool TextView::CanShowSelection()
{
    return enabled && !gPrinting;
}

inline void TextView::GetSelection(int *s, int *e)
{
    *s = start.ch;
    *e = end.ch;
}

inline const char *TextView::GetStopChars()
{
    return stopChars;
}

inline bool TextView::Writeable()
{
    return (bool) (!TestFlag(eTextViewReadOnly) && Enabled());
}

#endif