made wxFFile a bit more safe: don't crash when Tell() and Length() are called on...

[wxWidgets.git] / src / stc / scintilla / include / Platform.h

// Scintilla source code edit control
/** @file Platform.h
 ** Interface to platform facilities. Also includes some basic utilities.
 ** Implemented in PlatGTK.cxx for GTK+/Linux, PlatWin.cxx for Windows, and PlatWX.cxx for wxWindows.
 **/
// Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef PLATFORM_H
#define PLATFORM_H

// PLAT_GTK = GTK+ on Linux or Win32
// PLAT_GTK_WIN32 is defined additionally when running PLAT_GTK under Win32
// PLAT_WIN = Win32 API on Win32 OS
// PLAT_WX is wxWindows on any supported platform

#define PLAT_GTK 0
#define PLAT_GTK_WIN32 0
#define PLAT_WIN 0
#define PLAT_WX  0
#define PLAT_FOX 0

#if defined(FOX)
#undef PLAT_FOX
#define PLAT_FOX 1

#elif defined(__WX__)
#undef PLAT_WX
#define PLAT_WX  1

#elif defined(GTK)
#undef PLAT_GTK
#define PLAT_GTK 1

#ifdef _MSC_VER
#undef PLAT_GTK_WIN32
#define PLAT_GTK_WIN32 1
#endif

#else
#undef PLAT_WIN
#define PLAT_WIN 1

#endif


#if PLAT_WX
#include <wx/object.h>  // For the global memory operators, if needed.
#endif


// Underlying the implementation of the platform classes are platform specific types.
// Sometimes these need to be passed around by client code so they are defined here

typedef void *FontID;
typedef void *SurfaceID;
typedef void *WindowID;
typedef void *MenuID;
typedef void *TickerID;
typedef void *Function;
typedef void *IdlerID;

/**
 * A geometric point class.
 * Point is exactly the same as the Win32 POINT and GTK+ GdkPoint so can be used interchangeably.
 */
class Point {
public:
	int x;
	int y;

	Point(int x_=0, int y_=0) : x(x_), y(y_) {
	}

	// Other automatically defined methods (assignment, copy constructor, destructor) are fine

	static Point FromLong(long lpoint);
};

/**
 * A geometric rectangle class.
 * PRectangle is exactly the same as the Win32 RECT so can be used interchangeably.
 * PRectangles contain their top and left sides, but not their right and bottom sides.
 */
class PRectangle {
public:
	int left;
	int top;
	int right;
	int bottom;

	PRectangle(int left_=0, int top_=0, int right_=0, int bottom_ = 0) :
		left(left_), top(top_), right(right_), bottom(bottom_) {
	}

	// Other automatically defined methods (assignment, copy constructor, destructor) are fine

	bool operator==(PRectangle &rc) {
		return (rc.left == left) && (rc.right == right) &&
			(rc.top == top) && (rc.bottom == bottom);
	}
	bool Contains(Point pt) {
		return (pt.x >= left) && (pt.x <= right) &&
			(pt.y >= top) && (pt.y <= bottom);
	}
	bool Contains(PRectangle rc) {
		return (rc.left >= left) && (rc.right <= right) &&
			(rc.top >= top) && (rc.bottom <= bottom);
	}
	bool Intersects(PRectangle other) {
		return (right > other.left) && (left < other.right) &&
			(bottom > other.top) && (top < other.bottom);
	}
	void Move(int xDelta, int yDelta) {
		left += xDelta;
		top += yDelta;
		right += xDelta;
		bottom += yDelta;
	}
	int Width() { return right - left; }
	int Height() { return bottom - top; }
};

/**
 * In some circumstances, including Win32 in paletted mode and GTK+, each colour
 * must be allocated before use. The desired colours are held in the ColourDesired class,
 * and after allocation the allocation entry is stored in the ColourAllocated class. In other
 * circumstances, such as Win32 in true colour mode, the allocation process just copies
 * the RGB values from the desired to the allocated class.
 * As each desired colour requires allocation before it can be used, the ColourPair class
 * holds both a ColourDesired and a ColourAllocated
 * The Palette class is responsible for managing the palette of colours which contains a
 * list of ColourPair objects and performs the allocation.
 */

/**
 * Holds a desired RGB colour.
 */
class ColourDesired {
	long co;
public:
	ColourDesired(long lcol=0) {
		co = lcol;
	}

	ColourDesired(unsigned int red, unsigned int green, unsigned int blue) {
		Set(red, green, blue);
	}

	bool operator==(const ColourDesired &other) const {
		return co == other.co;
	}

	void Set(long lcol) {
		co = lcol;
	}

	void Set(unsigned int red, unsigned int green, unsigned int blue) {
		co = red | (green << 8) | (blue << 16);
	}

	static inline unsigned int ValueOfHex(const char ch) {
		if (ch >= '0' && ch <= '9')
			return ch - '0';
		else if (ch >= 'A' && ch <= 'F')
			return ch - 'A' + 10;
		else if (ch >= 'a' && ch <= 'f')
			return ch - 'a' + 10;
		else
			return 0;
	}

	void Set(const char *val) {
		if (*val == '#') {
			val++;
		}
		unsigned int r = ValueOfHex(val[0]) * 16 + ValueOfHex(val[1]);
		unsigned int g = ValueOfHex(val[2]) * 16 + ValueOfHex(val[3]);
		unsigned int b = ValueOfHex(val[4]) * 16 + ValueOfHex(val[5]);
		Set(r, g, b);
	}

	long AsLong() const {
		return co;
	}

	unsigned int GetRed() {
		return co & 0xff;
	}

	unsigned int GetGreen() {
		return (co >> 8) & 0xff;
	}

	unsigned int GetBlue() {
		return (co >> 16) & 0xff;
	}
};

/**
 * Holds an allocated RGB colour which may be an approximation to the desired colour.
 */
class ColourAllocated {
	long coAllocated;

public:

	ColourAllocated(long lcol=0) {
		coAllocated = lcol;
	}

	void Set(long lcol) {
		coAllocated = lcol;
	}

	long AsLong() const {
		return coAllocated;
	}
};

/**
 * Colour pairs hold a desired colour and an allocated colour.
 */
struct ColourPair {
	ColourDesired desired;
	ColourAllocated allocated;

	ColourPair(ColourDesired desired_=ColourDesired(0,0,0)) {
		desired = desired_;
		allocated.Set(desired.AsLong());
	}
	void Copy() {
		allocated.Set(desired.AsLong());
	}
};

class Window;	// Forward declaration for Palette

/**
 * Colour palette management.
 */
class Palette {
	int used;
	enum {numEntries = 100};
	ColourPair entries[numEntries];
#if PLAT_GTK
	void *allocatedPalette; // GdkColor *
	int allocatedLen;
#endif
public:
#if PLAT_WIN
	void *hpal;
#endif
	bool allowRealization;

	Palette();
	~Palette();

	void Release();

	/**
	 * This method either adds a colour to the list of wanted colours (want==true)
	 * or retrieves the allocated colour back to the ColourPair.
	 * This is one method to make it easier to keep the code for wanting and retrieving in sync.
	 */
	void WantFind(ColourPair &cp, bool want);

	void Allocate(Window &w);
};

/**
 * Font management.
 */
class Font {
protected:
	FontID id;
#if PLAT_WX
	int ascent;
#endif
	// Private so Font objects can not be copied
	Font(const Font &) {}
	Font &operator=(const Font &) { id=0; return *this; }
public:
	Font();
	virtual ~Font();

	virtual void Create(const char *faceName, int characterSet, int size, bool bold, bool italic);
	virtual void Release();

	FontID GetID() { return id; }
	// Alias another font - caller guarantees not to Release
	void SetID(FontID id_) { id = id_; }
	friend class Surface;
        friend class SurfaceImpl;
};

/**
 * A surface abstracts a place to draw.
 */
class Surface {
private:
	// Private so Surface objects can not be copied
	Surface(const Surface &) {}
	Surface &operator=(const Surface &) { return *this; }
public:
	Surface() {};
	virtual ~Surface() {};
	static Surface *Allocate();

	virtual void Init(WindowID wid)=0;
	virtual void Init(SurfaceID sid, WindowID wid)=0;
	virtual void InitPixMap(int width, int height, Surface *surface_, WindowID wid)=0;

	virtual void Release()=0;
	virtual bool Initialised()=0;
	virtual void PenColour(ColourAllocated fore)=0;
	virtual int LogPixelsY()=0;
	virtual int DeviceHeightFont(int points)=0;
	virtual void MoveTo(int x_, int y_)=0;
	virtual void LineTo(int x_, int y_)=0;
	virtual void Polygon(Point *pts, int npts, ColourAllocated fore, ColourAllocated back)=0;
	virtual void RectangleDraw(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
	virtual void FillRectangle(PRectangle rc, ColourAllocated back)=0;
	virtual void FillRectangle(PRectangle rc, Surface &surfacePattern)=0;
	virtual void RoundedRectangle(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
	virtual void Ellipse(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
	virtual void Copy(PRectangle rc, Point from, Surface &surfaceSource)=0;

	virtual void DrawTextNoClip(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore, ColourAllocated back)=0;
	virtual void DrawTextClipped(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore, ColourAllocated back)=0;
	virtual void DrawTextTransparent(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore)=0;
	virtual void MeasureWidths(Font &font_, const char *s, int len, int *positions)=0;
	virtual int WidthText(Font &font_, const char *s, int len)=0;
	virtual int WidthChar(Font &font_, char ch)=0;
	virtual int Ascent(Font &font_)=0;
	virtual int Descent(Font &font_)=0;
	virtual int InternalLeading(Font &font_)=0;
	virtual int ExternalLeading(Font &font_)=0;
	virtual int Height(Font &font_)=0;
	virtual int AverageCharWidth(Font &font_)=0;

	virtual int SetPalette(Palette *pal, bool inBackGround)=0;
	virtual void SetClip(PRectangle rc)=0;
	virtual void FlushCachedState()=0;

	virtual void SetUnicodeMode(bool unicodeMode_)=0;
	virtual void SetDBCSMode(int codePage)=0;
};

/**
 * A simple callback action passing one piece of untyped user data.
 */
typedef void (*CallBackAction)(void*);

/**
 * Class to hide the details of window manipulation.
 * Does not own the window which will normally have a longer life than this object.
 */
class Window {
protected:
	WindowID id;
public:
	Window() : id(0), cursorLast(cursorInvalid) {}
	Window(const Window &source) : id(source.id), cursorLast(cursorInvalid) {}
	virtual ~Window();
	Window &operator=(WindowID id_) {
		id = id_;
		return *this;
	}
	WindowID GetID() const { return id; }
	bool Created() const { return id != 0; }
	void Destroy();
	bool HasFocus();
	PRectangle GetPosition();
	void SetPosition(PRectangle rc);
	void SetPositionRelative(PRectangle rc, Window relativeTo);
	PRectangle GetClientPosition();
	void Show(bool show=true);
	void InvalidateAll();
	void InvalidateRectangle(PRectangle rc);
	virtual void SetFont(Font &font);
	enum Cursor { cursorInvalid, cursorText, cursorArrow, cursorUp, cursorWait, cursorHoriz, cursorVert, cursorReverseArrow, cursorHand };
	void SetCursor(Cursor curs);
	void SetTitle(const char *s);
private:
	Cursor cursorLast;
};

/**
 * Listbox management.
 */

class ListBox : public Window {
public:
	ListBox();
	virtual ~ListBox();
	static ListBox *Allocate();

	virtual void SetFont(Font &font)=0;
	virtual void Create(Window &parent, int ctrlID, int lineHeight_, bool unicodeMode_)=0;
	virtual void SetAverageCharWidth(int width)=0;
	virtual void SetVisibleRows(int rows)=0;
	virtual PRectangle GetDesiredRect()=0;
	virtual int CaretFromEdge()=0;
	virtual void Clear()=0;
	virtual void Append(char *s, int type = -1)=0;
	virtual int Length()=0;
	virtual void Select(int n)=0;
	virtual int GetSelection()=0;
	virtual int Find(const char *prefix)=0;
	virtual void GetValue(int n, char *value, int len)=0;
	virtual void RegisterImage(int type, const char *xpm_data)=0;
	virtual void ClearRegisteredImages()=0;
	virtual void SetDoubleClickAction(CallBackAction, void *)=0;
};

/**
 * Menu management.
 */
class Menu {
	MenuID id;
public:
	Menu();
	MenuID GetID() { return id; }
	void CreatePopUp();
	void Destroy();
	void Show(Point pt, Window &w);
};

class ElapsedTime {
	long bigBit;
	long littleBit;
public:
	ElapsedTime();
	double Duration(bool reset=false);
};

/**
 * Dynamic Library (DLL/SO/...) loading
 */
class DynamicLibrary {
public:
	virtual ~DynamicLibrary() {};

	/// @return Pointer to function "name", or NULL on failure.
	virtual Function FindFunction(const char *name) = 0;

	/// @return true if the library was loaded successfully.
	virtual bool IsValid() = 0;

	/// @return An instance of a DynamicLibrary subclass with "modulePath" loaded.
	static DynamicLibrary *Load(const char *modulePath);
};

/**
 * Platform class used to retrieve system wide parameters such as double click speed
 * and chrome colour. Not a creatable object, more of a module with several functions.
 */
class Platform {
	// Private so Platform objects can not be copied
	Platform(const Platform &) {}
	Platform &operator=(const Platform &) { return *this; }
public:
	// Should be private because no new Platforms are ever created
	// but gcc warns about this
	Platform() {}
	~Platform() {}
	static ColourDesired Chrome();
	static ColourDesired ChromeHighlight();
	static const char *DefaultFont();
	static int DefaultFontSize();
	static unsigned int DoubleClickTime();
	static bool MouseButtonBounce();
	static void DebugDisplay(const char *s);
	static bool IsKeyDown(int key);
	static long SendScintilla(
		WindowID w, unsigned int msg, unsigned long wParam=0, long lParam=0);
	static long SendScintillaPointer(
		WindowID w, unsigned int msg, unsigned long wParam=0, void *lParam=0);
	static bool IsDBCSLeadByte(int codePage, char ch);
	static int DBCSCharLength(int codePage, const char *s);
	static int DBCSCharMaxLength();

	// These are utility functions not really tied to a platform
	static int Minimum(int a, int b);
	static int Maximum(int a, int b);
	// Next three assume 16 bit shorts and 32 bit longs
	static long LongFromTwoShorts(short a,short b) {
		return (a) | ((b) << 16);
	}
	static short HighShortFromLong(long x) {
		return static_cast<short>(x >> 16);
	}
	static short LowShortFromLong(long x) {
		return static_cast<short>(x & 0xffff);
	}
	static void DebugPrintf(const char *format, ...);
	static bool ShowAssertionPopUps(bool assertionPopUps_);
	static void Assert(const char *c, const char *file, int line);
	static int Clamp(int val, int minVal, int maxVal);
};

#ifdef  NDEBUG
#define PLATFORM_ASSERT(c) ((void)0)
#else
#define PLATFORM_ASSERT(c) ((c) ? (void)(0) : Platform::Assert(#c, __FILE__, __LINE__))
#endif

// Shut up annoying Visual C++ warnings:
#ifdef _MSC_VER
#pragma warning(disable: 4244 4309 4514 4710)
#endif

#endif