editor.h

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// Scintilla source code edit control
/** @file Editor.h
 ** Defines the main editor class.
 **/
// Copyright 1998-2003 by Neil Hodgson <[e-mail]>
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef EDITOR_H
#define EDITOR_H

/**
 */
class Caret {
public:
	bool active;
	bool on;
	int period;

	Caret();
};

/**
 */
class Timer {
public:
	bool ticking;
	int ticksToWait;
	enum {tickSize = 100};
	TickerID tickerID;

	Timer();
};

/**
 */
class Idler {
public:
	bool state;
	IdlerID idlerID;

	Idler();
};

/**
 */
class LineLayout {
private:
	friend class LineLayoutCache;
	int *lineStarts;
	int lenLineStarts;
	/// Drawing is only performed for @a maxLineLength characters on each line.
	int lineNumber;
	bool inCache;
public:
	enum { wrapWidthInfinite = 0x7ffffff };
	int maxLineLength;
	int numCharsInLine;
	enum validLevel { llInvalid, llCheckTextAndStyle, llPositions, llLines } validity;
	int xHighlightGuide;
	bool highlightColumn;
	int selStart;
	int selEnd;
	bool containsCaret;
	int edgeColumn;
	char *chars;
	unsigned char *styles;
	int styleBitsSet;
	char *indicators;
	int *positions;
	char bracePreviousStyles[2];

	// Hotspot support
	int hsStart;
	int hsEnd;

	// Wrapped line support
	int widthLine;
	int lines;

	LineLayout(int maxLineLength_);
	virtual ~LineLayout();
	void Resize(int maxLineLength_);
	void Free();
	void Invalidate(validLevel validity_);
	int LineStart(int line) {
		if (line <= 0) {
			return 0;
		} else if ((line >= lines) || !lineStarts) {
			return numCharsInLine;
		} else {
			return lineStarts[line];
		}
	}
	void SetLineStart(int line, int start);
	void SetBracesHighlight(Range rangeLine, Position braces[],
		char bracesMatchStyle, int xHighlight);
	void RestoreBracesHighlight(Range rangeLine, Position braces[]);
};

/**
 */
class LineLayoutCache {
	int level;
	int length;
	int size;
	LineLayout **cache;
	bool allInvalidated;
	int styleClock;
	int useCount;
	void Allocate(int length_);
	void AllocateForLevel(int linesOnScreen, int linesInDoc);
public:
	LineLayoutCache();
	virtual ~LineLayoutCache();
	void Deallocate();
	enum {
		llcNone=SC_CACHE_NONE,
		llcCaret=SC_CACHE_CARET,
		llcPage=SC_CACHE_PAGE,
		llcDocument=SC_CACHE_DOCUMENT
	};
	void Invalidate(LineLayout::validLevel validity_);
	void SetLevel(int level_);
	int GetLevel() { return level; }
	LineLayout *Retrieve(int lineNumber, int lineCaret, int maxChars, int styleClock_,
		int linesOnScreen, int linesInDoc);
	void Dispose(LineLayout *ll);
};

/**
 * Hold a piece of text selected for copying or dragging.
 * The text is expected to hold a terminating '\0' and this is counted in len.
 */
class SelectionText {
public:
	char *s;
	int len;
	bool rectangular;
	int codePage;
	int characterSet;
	SelectionText() : s(0), len(0), rectangular(false), codePage(0), characterSet(0) {}
	~SelectionText() {
		Free();
	}
	void Free() {
		Set(0, 0, 0, 0, false);
	}
	void Set(char *s_, int len_, int codePage_, int characterSet_, bool rectangular_) {
		delete []s;
		s = s_;
		if (s)
			len = len_;
		else
			len = 0;
		codePage = codePage_;
		characterSet = characterSet_;
		rectangular = rectangular_;
	}
	void Copy(const char *s_, int len_, int codePage_, int characterSet_, bool rectangular_) {
		delete []s;
		s = new char[len_];
		if (s) {
			len = len_;
			for (int i = 0; i < len_; i++) {
				s[i] = s_[i];
			}
		} else {
			len = 0;
		}
		codePage = codePage_;
		characterSet = characterSet_;
		rectangular = rectangular_;
	}
	void Copy(const SelectionText &other) {
		Copy(other.s, other.len, other.codePage, other.characterSet, other.rectangular);
	}
};

/**
 */
class Editor : public DocWatcher {
	// Private so Editor objects can not be copied
	Editor(const Editor &) : DocWatcher() {}
	Editor &operator=(const Editor &) { return *this; }

protected:	// ScintillaBase subclass needs access to much of Editor

	/** On GTK+, Scintilla is a container widget holding two scroll bars
	 * whereas on Windows there is just one window with both scroll bars turned on. */
	Window wMain;	///< The Scintilla parent window

	/** Style resources may be expensive to allocate so are cached between uses.
	 * When a style attribute is changed, this cache is flushed. */
	bool stylesValid;
	ViewStyle vs;
	Palette palette;

	int printMagnification;
	int printColourMode;
	int printWrapState;
	int cursorMode;
	int controlCharSymbol;

	bool hasFocus;
	bool hideSelection;
	bool inOverstrike;
	int errorStatus;
	bool mouseDownCaptures;

	/** In bufferedDraw mode, graphics operations are drawn to a pixmap and then copied to
	 * the screen. This avoids flashing but is about 30% slower. */
	bool bufferedDraw;
	/** In twoPhaseDraw mode, drawing is performed in two phases, first the background
	* and then the foreground. This avoids chopping off characters that overlap the next run. */
	bool twoPhaseDraw;

	int xOffset;		///< Horizontal scrolled amount in pixels
	int xCaretMargin;	///< Ensure this many pixels visible on both sides of caret
	bool horizontalScrollBarVisible;
	int scrollWidth;
	bool verticalScrollBarVisible;
	bool endAtLastLine;
	bool caretSticky;

	Surface *pixmapLine;
	Surface *pixmapSelMargin;
	Surface *pixmapSelPattern;
	Surface *pixmapIndentGuide;
	Surface *pixmapIndentGuideHighlight;

	LineLayoutCache llc;

	KeyMap kmap;

	Caret caret;
	Timer timer;
	Timer autoScrollTimer;
	enum { autoScrollDelay = 200 };

	Idler idler;

	Point lastClick;
	unsigned int lastClickTime;
	int dwellDelay;
	int ticksToDwell;
	bool dwelling;
	enum { selChar, selWord, selLine } selectionType;
	Point ptMouseLast;
	bool inDragDrop;
	bool dropWentOutside;
	int posDrag;
	int posDrop;
	int lastXChosen;
	int lineAnchor;
	int originalAnchorPos;
	int currentPos;
	int anchor;
	int targetStart;
	int targetEnd;
	int searchFlags;
	int topLine;
	int posTopLine;
	int lengthForEncode;

	bool needUpdateUI;
	Position braces[2];
	int bracesMatchStyle;
	int highlightGuideColumn;

	int theEdge;

	enum { notPainting, painting, paintAbandoned } paintState;
	PRectangle rcPaint;
	bool paintingAllText;

	int modEventMask;

	SelectionText drag;
	enum selTypes { noSel, selStream, selRectangle, selLines };
	selTypes selType;
	bool moveExtendsSelection;
	int xStartSelect;	///< x position of start of rectangular selection
	int xEndSelect;		///< x position of end of rectangular selection
	bool primarySelection;

	int caretXPolicy;
	int caretXSlop;	///< Ensure this many pixels visible on both sides of caret

	int caretYPolicy;
	int caretYSlop;	///< Ensure this many lines visible on both sides of caret