/** DGui project file.

Copyright: Trogu Antonio Davide 2011-2013

License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).

Authors: Trogu Antonio Davide
*/
module dguihub.canvas;

import std.conv : to;
import std.path;
import std..string;
import core.memory;
import dguihub.core.interfaces.idisposable;
import dguihub.core.charset;
import dguihub.core.winapi;
import dguihub.core.exception;
import dguihub.core.handle;
import dguihub.core.utils;
public import dguihub.core.geometry;

/**
  Enum that contain the font style of a Font Object.
  */
enum FontStyle : ubyte {
   normal = 0, /// Normal Font Style
   bold = 1, /// Bold Font Style
   italic = 2, /// Italic Font Style
   underline = 4, /// Underline Font Style
   strikeout = 8, /// Strikeout Font Style
}

/**
  Enum that contain the image type (useful in order to identify a Image object).
  */

enum ImageType {
   bitmap = 0, /// Bitmap Image
   iconOrCursor = 1, /// Icon or Cursor
}

/**
  Enum that specify the fill mode of a gradient.
  */
enum GradientFillRectMode {
   horizontal = 0, /// Horizontal Fill
   vertical = 1, /// Vertical Fill
}

/**
  Enum that specify the border type (used in a Canvas.drawEdge() call).
  */
enum EdgeType : uint {
   raisedOuter = BDR_RAISEDOUTER, /// Raised Outer Edge
   raisedInner = BDR_RAISEDINNER, /// Raised Innter Edge

   sunkenOuter = BDR_SUNKENOUTER, /// Sunken Outer Edge
   sunkenInner = BDR_SUNKENINNER, /// Sunken Inner Edge

   bump = EDGE_BUMP, /// Bump Edge
   etched = EDGE_ETCHED, /// Etched Edge
   raised = EDGE_RAISED, /// Edge Raised Edge
   sunken = EDGE_SUNKEN, /// Sunken Edge
}

enum FrameType : uint {
   button = DFC_BUTTON,
   caption = DFC_CAPTION,
   menu = DFC_MENU,
   popupMenu = DFC_POPUPMENU,
   scroll = DFC_SCROLL,
}

enum FrameMode : uint {
   button3state = DFCS_BUTTON3STATE,
   buttonCheck = DFCS_BUTTONCHECK,
   buttonPush = DFCS_BUTTONPUSH,
   buttonRadio = DFCS_BUTTONRADIO,
   buttonRadioImage = DFCS_BUTTONRADIOIMAGE,
   buttonRadioMask = DFCS_BUTTONRADIOMASK,

   captionClose = DFCS_CAPTIONCLOSE,
   captionHelp = DFCS_CAPTIONHELP,
   captionMax = DFCS_CAPTIONMAX,
   captionMin = DFCS_CAPTIONMIN,
   captionRestore = DFCS_CAPTIONRESTORE,

   menuArrow = DFCS_MENUARROW,
   menuArrowRight = DFCS_MENUARROWRIGHT,
   menuBullet = DFCS_MENUBULLET,
   menuCheck = DFCS_MENUCHECK,

   scrollComboBox = DFCS_SCROLLCOMBOBOX,
   scrollDown = DFCS_SCROLLDOWN,
   scrollLeft = DFCS_SCROLLLEFT,
   scrollRight = DFCS_SCROLLRIGHT,
   scrollSizeGrip = DFCS_SCROLLSIZEGRIP,
   scrollSizeGripRight = DFCS_SCROLLSIZEGRIPRIGHT,
   scrollUp = DFCS_SCROLLUP,

   checked = DFCS_CHECKED,
   flat = DFCS_FLAT,
   hot = DFCS_HOT,
   inactive = DFCS_INACTIVE,
   mono = DFCS_MONO,
   pushed = DFCS_PUSHED,
   transparent = DFCS_TRANSPARENT,
}

/**
  Enum that specify the draw border mode  (used in a Canvas.drawEdge() call).
  */
enum EdgeMode : uint {
   adjust = BF_ADJUST, /// Shrink the rectangle in order to exlude the edges that were drawn.
   diagonal = BF_DIAGONAL, /// Diagonal Border.
   flat = BF_FLAT, /// Flat Border.
   left = BF_LEFT, /// Left Border Only.
   top = BF_TOP, /// Top Border Only.
   right = BF_RIGHT, /// Right Border Only.
   bottom = BF_BOTTOM, /// Bottom Border Only.
   internal = BF_MIDDLE, /// Internal Border will be filled.
   mono = BF_MONO, /// One Dimensional Border.
   rect = BF_RECT, /// Fills the entire border of the rectangle.
   //SOFT 	 = BF_SOFT,
}

/**
  Enum that specify the style of a Hatch Brush object
  */
enum HatchStyle : int {
   horizontal = HS_HORIZONTAL, /// The brush has horizontal stripes.
   vertical = HS_VERTICAL, /// The brush has vertical stripes.
   degree45Upward = HS_BDIAGONAL, /// The brush has 45° degree rising stripes.
   degree45Downward = HS_FDIAGONAL, /// The brush has 45° degree falling stripes.
   cross = HS_CROSS, /// The brush has crossed stripes.
   diagonalCross = HS_DIAGCROSS, /// The brush has diagonal crossed stripes.
}

/**
  Enum that specify the style of a Pen object.
  */
enum PenStyle : uint {
   solid = PS_SOLID, /// Solid Pen (Standard).
   dash = PS_DASH, /// Dashed Pen.
   dot = PS_DOT, /// Dotted Pen.
   dashDot = PS_DASHDOT, /// Dash-Dotted Pen.
   dashDotDot = PS_DASHDOTDOT, /// Dashed-Dotted-Dotted Pen.
   null_ = PS_NULL, /// Invisible Pen.
   insideFrame = PS_INSIDEFRAME, /// Solid Pen (line are drown inside the border of a closed shape).
}

/**
  Enum that specify the style of a text in a drawText() call
  */
enum TextFormatFlags : uint {
   noPrefix = DT_NOPREFIX, /// Turn of processing of prefix characters (like '&', character that it will be not displayed underline).
   wordBreak = DT_WORDBREAK, /// Break the line if a carriage return is found or the selected rectangle is too small.
   singleLine = DT_SINGLELINE, /// The text is draw in one single line.
   lineLimit = DT_EDITCONTROL, /// Duplicate the text displaying of a multiline control.
   noClip = DT_NOCLIP, /// The text is not clipped.
   //DIRECTION_RIGHT_TO_LEFT = DT_RTLREADING,
}

/**
  Enum that specify the style of a text alignment in a drawText() call
  */
enum TextAlignment : uint {
   left = DT_LEFT, /// Text is left aligned.
   right = DT_RIGHT, /// Text is right aligned.
   center = DT_CENTER, /// Text is centred horizontally.

   top = DT_TOP, /// Text is top aligned.
   bottom = DT_BOTTOM, /// Text is bottom aligned.
   middle = DT_VCENTER, /// Text is centred vertically.
}

/**
  Enum that specify the trimming of a text alignment in a drawText() call
  */
enum TextTrimming : uint {
   none = 0, /// No Trimming.
   ellipsis = DT_END_ELLIPSIS, /// If the text is too long, it will be replaced with end ellipsis (like: ellips...).
   ellipsisPath = DT_PATH_ELLIPSIS, /// If the text is too long, it will be replaces with middle ellipsis (like: texttr...ing).
}

/**
  Specify the copy mode of a Bitmap
  */
enum BitmapCopyMode {
   normal = SRCCOPY, /// Standard Copy.
   invert = SRCINVERT, /// Copy Inverted.
   and = SRCAND, /// Copy using _AND operator (Source _AND Destination).
   or = SRCPAINT, /// Copy using _OR operator (Source _OR Destination).
}

/**
  It rappresentes a color of a bitmap.
  */
struct BitmapBit {
   union {
      ubyte rgbBlue;
      ubyte blue; /// Blue color.
   }

   union {
      ubyte rgbGreen;
      ubyte green; /// Green color.
   }

   union {
      ubyte rgbRed;
      ubyte red; /// Red color.
   }

   union {
      ubyte rgbReserved;
      ubyte alpha; /// Alpha channel (if available).
   }
}

/**
  This structure allows direct modification of a bitmap
  */
struct BitmapData {
   BITMAPINFO* info; /// BITMAPINFO structure (usually, it is used internally).
   uint imageSize; /// The size of the _Bitmap.
   uint bitsCount; /// Number of BitmapBits structure of the _Bitmap (is the _Bits field length).
   BitmapBit* bits; /// Pointer to the _Bitmap's bits (it allows direct modification of the colors)
}

/**
  A _Color in ARGB format (compatible with COLORREF win32 type)
  */
struct Color {
   private bool _valid = false; // Check if it was assigned a value

   public union {
      align(1) struct {
         ubyte red = 0x00;
         ubyte green = 0x00;
         ubyte blue = 0x00;
         ubyte alpha = 0x00; //0x00: Transparent (or Don't Care), 0xFF: Opaque
      }

      COLORREF colorref; /// Compatibility with COLORREF type
   }

   /// Checks if the color information is _valid.
   @property public final bool valid() {
      return this._valid;
   }

   public static Color opCall(ubyte r, ubyte g, ubyte b) {
      return Color(0x00, r, g, b);
   }

   public static Color opCall(ubyte a, ubyte r, ubyte g, ubyte b) {
      Color color = void; //Inializzata sotto;

      color._valid = true;

      color.alpha = a;
      color.red = r;
      color.green = g;
      color.blue = b;

      return color;
   }

   /// Returns an invalid color
   public static Color invalid() {
      static Color color;
      //color._valid = false; //Set valid to false (false = default value)
      return color;
   }

   /// Given a COLORREF, it returns a _Color object
   public static Color fromCOLORREF(COLORREF cref) {
      Color color = void;

      color._valid = true;
      color.colorref = cref;
      return color;
   }
}

struct FontMetrics {
   int height;
   int ascent;
   int descent;
   int internalLeading;
   int externalLeading;
   int averageCharWidth;
   int maxCharWidth;
}

/**
 The _Canvas object is the DGui's rappresentation of a Device Context (Screen DC, Memory DC and Printer DC)
 $(DDOC_BLANKLINE)
 $(B Note): Printer DC is not implemented
 */
class Canvas : Handle!(HDC), IDisposable {
   private alias extern (Windows) BOOL function(HDC, int, int, int, int, HDC,
         int, int, int, int, UINT) GdiTransparentBltProc;
   private alias extern (Windows) BOOL function(HDC, int, int, int, int, HDC,
         int, int, int, int, BLENDFUNCTION) GdiAlphaBlendProc;
   private alias extern (Windows) BOOL function(HDC, TRIVERTEX*, ULONG, void*, ULONG, ULONG) GdiGradientFillProc;

   private static GdiTransparentBltProc _gdiTransparentBlt = null;
   private static GdiAlphaBlendProc _gdiAlphaBlend = null;
   private static GdiGradientFillProc _gdiGradientFill = null;

   private enum CanvasType : ubyte {
      normal = 0,
      fromControl = 1,
      inMemory = 2,
   }

   private CanvasType _canvasType = CanvasType.normal;
   private HBITMAP _hBitmap;
   private bool _owned;

   protected this(HDC hdc, bool owned, CanvasType type) {
      this._handle = hdc;
      this._owned = owned;
      this._canvasType = type;
   }

   public ~this() {
      this.dispose();
   }

   public void copyTo(Canvas c, BitmapCopyMode bcm, Rect destRect, Point posSrc) {
      BITMAP bmp;

      if (!destRect.width && destRect.height) {
         GetObjectW(GetCurrentObject(this._handle, OBJ_BITMAP), BITMAP.sizeof, &bmp);
      }

      BitBlt(c.handle, destRect.x, destRect.y, destRect.width ? destRect.width
            : bmp.bmWidth, destRect.height ? destRect.height : bmp.bmHeight,
            this._handle, posSrc.x, posSrc.y, bcm);
   }

   public void copyTo(Canvas c, Rect destRect, Point posSrc) {
      this.copyTo(c, BitmapCopyMode.normal, destRect, posSrc);
   }

   public void copyTo(Canvas c, BitmapCopyMode bcm, Rect destRect) {
      this.copyTo(c, bcm, destRect, nullPoint);
   }

   public void copyTo(Canvas c, BitmapCopyMode bcm) {
      this.copyTo(c, bcm, nullRect, nullPoint);
   }

   public void copyTo(Canvas c) {
      this.copyTo(c, BitmapCopyMode.normal);
   }

   public void copyTransparent(Canvas c, Color transpColor) {
      this.copyTransparent(c, transpColor, nullRect);
   }

   public void copyTransparent(Canvas c, Color transpColor, Rect r) {
      if (!_gdiTransparentBlt) {
         _gdiTransparentBlt = cast(GdiTransparentBltProc)GetProcAddress(
               getModuleHandle("gdi32.dll"), toStringz("GdiTransparentBlt"));
      }

      BITMAP bmp;
      HBITMAP hBitmap = GetCurrentObject(this._handle, OBJ_BITMAP);
      GetObjectW(hBitmap, BITMAP.sizeof, &bmp);

      if (r.empty) {
         r = Rect(0, 0, bmp.bmWidth, bmp.bmHeight);
      }

      _gdiTransparentBlt(c.handle, r.x, r.y, r.width, r.height, this._handle,
            0, 0, bmp.bmWidth, bmp.bmHeight, transpColor.colorref);
   }

   public void dispose() {
      if (this._handle && this._owned) {
         switch (this._canvasType) {
         case CanvasType.fromControl:
            ReleaseDC(WindowFromDC(this._handle), this._handle);
            break;

         case CanvasType.inMemory:
            DeleteObject(this._hBitmap);
            DeleteDC(this._handle);
            break;

         default:
            break;
         }

         this._handle = null;
      }
   }

   public static Size measureString(string s, Canvas c, Font f) {
      Size sz;

      HFONT hOldFont = f ? SelectObject(c.handle, f.handle) : null;
      GetTextExtentPoint32W(c.handle, toUTFz!(wchar*)(s), s.length, &sz.size);

      if (f) {
         SelectObject(c.handle, hOldFont);
      }

      return sz;
   }

   public static Size measureString(string s, Canvas c) {
      return Canvas.measureString(s, c, null);
   }

   public static Size measureString(string s, Font f) {
      scope Canvas c = Screen.canvas;
      return Canvas.measureString(s, c, f);
   }

   public static Size measureString(string s) {
      scope Canvas c = Screen.canvas;
      return Canvas.measureString(s, c, SystemFonts.windowsFont);
   }

   public final void fillRectGradient(Rect r, Color startColor, Color endColor,
         GradientFillRectMode gfrm) {
      if (!_gdiGradientFill) {
         _gdiGradientFill = cast(GdiGradientFillProc)GetProcAddress(getModuleHandle("gdi32.dll"),
               toStringz("GdiGradientFill"));
      }

      TRIVERTEX[2] tv;
      static GRADIENT_RECT gr = {UpperLeft:
      0, LowerRight : 1};

      tv[0].x = r.left;
      tv[0].y = r.top;
      tv[0].Red = startColor.red << 8;
      tv[0].Green = startColor.green << 8;
      tv[0].Blue = startColor.blue << 8;
      tv[0].Alpha = startColor.alpha << 8;

      tv[1].x = r.right;
      tv[1].y = r.bottom;
      tv[1].Red = endColor.red << 8;
      tv[1].Green = endColor.green << 8;
      tv[1].Blue = endColor.blue << 8;
      tv[1].Alpha = endColor.alpha << 8;

      _gdiGradientFill(this._handle, tv.ptr, 2, &gr, 1, gfrm);
   }

   public final void fillTriangleGradient(int x1, int y1, int x2, int y2, int x3,
         int y3, Color color1, Color color2, Color color3) {
      this.fillTriangleGradient(Point(x1, y1), Point(x2, y2), Point(x3, y3),
            color1, color2, color3);
   }

   public final void fillTriangleGradient(Point pt1, Point pt2, Point pt3,
         Color color1, Color color2, Color color3) {
      if (!_gdiGradientFill) {
         _gdiGradientFill = cast(GdiGradientFillProc)GetProcAddress(getModuleHandle("gdi32.dll"),
               toStringz("GdiGradientFill"));
      }

      TRIVERTEX[3] tv;
      static GRADIENT_TRIANGLE gt = {Vertex1:
      0, Vertex2 : 1, Vertex3 : 2};

      tv[0].x = pt1.x;
      tv[0].y = pt1.y;
      tv[0].Red = color1.red << 8;
      tv[0].Green = color1.green << 8;
      tv[0].Blue = color1.blue << 8;
      tv[0].Alpha = color1.alpha << 8;

      tv[1].x = pt2.x;
      tv[1].y = pt2.y;
      tv[1].Red = color2.red << 8;
      tv[1].Green = color2.green << 8;
      tv[1].Blue = color2.blue << 8;
      tv[1].Alpha = color2.alpha << 8;

      tv[2].x = pt3.x;
      tv[2].y = pt3.y;
      tv[2].Red = color3.red << 8;
      tv[2].Green = color3.green << 8;
      tv[2].Blue = color3.blue << 8;
      tv[2].Alpha = color3.alpha << 8;

      _gdiGradientFill(this._handle, tv.ptr, 3, &gt, 1, 2 /* GRADIENT_FILL_TRIANGLE */ );
   }

   public final void drawImage(Image img, Point upLeft, Point upRight, Point lowLeft) {
      this.drawImage(img, 0, 0, upLeft, upRight, lowLeft);
   }

   public final void drawImage(Image img, int x, int y, Point upLeft, Point upRight, Point lowLeft) {
      POINT[3] pts;

      pts[0] = upLeft.point;
      pts[1] = upRight.point;
      pts[2] = lowLeft.point;

      Size sz = img.size;
      HDC hdc = CreateCompatibleDC(this._handle);
      HBITMAP hOldBitmap = SelectObject(hdc, img.handle);

      PlgBlt(this._handle, pts.ptr, hdc, x, y, sz.width, sz.height, null, 0, 0);

      SelectObject(hdc, hOldBitmap);
      DeleteDC(hdc);
   }

   public final void drawImage(Image img, int x, int y) {
      Size sz = img.size;

      switch (img.type) {
      case ImageType.bitmap:
         HDC hdc = CreateCompatibleDC(this._handle);
         HBITMAP hOldBitmap = SelectObject(hdc, img.handle);
         BitBlt(this._handle, x, y, sz.width, sz.height, hdc, 0, 0, SRCCOPY);
         SelectObject(hdc, hOldBitmap);
         DeleteDC(hdc);
         break;

      case ImageType.iconOrCursor:
         DrawIconEx(this._handle, x, y, img.handle,
               sz.width, sz.height, 0, null, DI_NORMAL);
         break;

      default:
         break;
      }
   }

   public final void drawImage(Image img, Rect r) {
      Size sz = img.size;

      switch (img.type) {
      case ImageType.bitmap:
         HDC hdc = CreateCompatibleDC(this._handle);
         HBITMAP hOldBitmap = SelectObject(hdc, img.handle);
         StretchBlt(this._handle, r.x, r.y, r.width, r.height, hdc, 0, 0,
               sz.width, sz.height, SRCCOPY);
         SelectObject(hdc, hOldBitmap);
         DeleteDC(hdc);
         break;

      case ImageType.iconOrCursor:
         DrawIconEx(this._handle, r.x, r.y,
               img.handle, r.width, r.height, 0, null, DI_NORMAL);
         break;

      default:
         break;
      }
   }

   public final void drawFrameControl(Rect r, FrameType frameType, FrameMode frameMode) {
      DrawFrameControl(this._handle, &r.rect, frameType, frameMode);
   }

   public final void drawEdge(Rect r, EdgeType edgeType, EdgeMode edgeMode) {
      DrawEdge(this._handle, &r.rect, edgeType, edgeMode);
   }

   public final void drawText(string text, Rect r, Color foreColor, Font font,
         TextFormat textFormat) {
      DRAWTEXTPARAMS dtp;

      dtp.cbSize = DRAWTEXTPARAMS.sizeof;
      dtp.iLeftMargin = textFormat.leftMargin;
      dtp.iRightMargin = textFormat.rightMargin;
      dtp.iTabLength = textFormat.tabLength;

      HFONT hOldFont = SelectObject(this._handle, font.handle);
      COLORREF oldColorRef = SetTextColor(this._handle, foreColor.colorref);
      int oldBkMode = SetBkMode(this._handle, TRANSPARENT);

      drawTextEx(this._handle, text, &r.rect,
            DT_EXPANDTABS | DT_TABSTOP | textFormat.formatFlags | textFormat.alignment | textFormat.trimming,
            &dtp);

      SetBkMode(this._handle, oldBkMode);
      SetTextColor(this._handle, oldColorRef);
      SelectObject(this._handle, hOldFont);
   }

   public final void drawText(string text, Rect r, Color foreColor, Font font) {
      scope TextFormat tf = new TextFormat(
            TextFormatFlags.noPrefix | TextFormatFlags.wordBreak
            | TextFormatFlags.noClip | TextFormatFlags.lineLimit);

      tf.trimming = TextTrimming.none;

      this.drawText(text, r, foreColor, font, tf);
   }

   public final void drawText(string text, Rect r, Color foreColor) {
      scope Font f = Font.fromHFONT(GetCurrentObject(this._handle, OBJ_FONT), false);
      this.drawText(text, r, foreColor, f);
   }

   public final void drawText(string text, Rect r, Font f, TextFormat tf) {
      this.drawText(text, r, Color.fromCOLORREF(GetTextColor(this._handle)), f, tf);
   }

   public final void drawText(string text, Rect r, TextFormat tf) {
      scope Font f = Font.fromHFONT(GetCurrentObject(this._handle, OBJ_FONT), false);
      this.drawText(text, r, Color.fromCOLORREF(GetTextColor(this._handle)), f, tf);
   }

   public final void drawText(string text, Rect r, Font f) {
      this.drawText(text, r, Color.fromCOLORREF(GetTextColor(this._handle)), f);
   }

   public final void drawText(string text, Rect r) {
      scope Font f = Font.fromHFONT(GetCurrentObject(this._handle, OBJ_FONT), false);
      this.drawText(text, r, Color.fromCOLORREF(GetTextColor(this._handle)), f);
   }

   public final void drawLine(Pen p, int x1, int y1, int x2, int y2) {
      HPEN hOldPen = SelectObject(this._handle, p.handle);

      MoveToEx(this._handle, x1, y1, null);
      LineTo(this._handle, x2, y2);

      SelectObject(this._handle, hOldPen);
   }

   public final void drawEllipse(Pen pen, Brush fill, Rect r) {
      HPEN hOldPen;
      HBRUSH hOldBrush;

      if (pen) {
         hOldPen = SelectObject(this._handle, pen.handle);
      }

      if (fill) {
         hOldBrush = SelectObject(this._handle, fill.handle);
      }

      Ellipse(this._handle, r.left, r.top, r.right, r.bottom);

      if (hOldBrush) {
         SelectObject(this._handle, hOldBrush);
      }

      if (hOldPen) {
         SelectObject(this._handle, hOldPen);
      }
   }

   public final void drawEllipse(Pen pen, Rect r) {
      this.drawEllipse(pen, SystemBrushes.nullBrush, r);
   }

   public final void drawRectangle(Pen pen, Brush fill, Rect r) {
      HPEN hOldPen;
      HBRUSH hOldBrush;

      if (pen) {
         hOldPen = SelectObject(this._handle, pen.handle);
      }

      if (fill) {
         hOldBrush = SelectObject(this._handle, fill.handle);
      }

      Rectangle(this._handle, r.left, r.top, r.right, r.bottom);

      if (hOldBrush) {
         SelectObject(this._handle, hOldBrush);
      }

      if (hOldPen) {
         SelectObject(this._handle, hOldPen);
      }
   }

   public final void drawRectangle(Pen pen, Rect r) {
      this.drawRectangle(pen, SystemBrushes.nullBrush, r);
   }

   public final void fillRectangle(Brush b, Rect r) {
      FillRect(this._handle, &r.rect, b.handle);
   }

   public final void fillEllipse(Brush b, Rect r) {
      this.drawEllipse(SystemPens.nullPen, b, r);
   }

   public final Canvas createInMemory(Bitmap b) {
      HDC hdc = CreateCompatibleDC(this._handle);
      Canvas c = new Canvas(hdc, true, CanvasType.inMemory);

      if (!b) {
         Rect r;
         HWND hWnd = WindowFromDC(this._handle);

         if (hWnd) {
            GetClientRect(hWnd, &r.rect);
         } else // Try with bitmap's size
         {
            BITMAP bmp;
            HBITMAP hOrgBitmap = GetCurrentObject(this._handle, OBJ_BITMAP);
            GetObjectW(hOrgBitmap, BITMAP.sizeof, &bmp);

            assert(bmp.bmWidth > 0 && bmp.bmHeight > 0, "Bitmap zero size");
            r = Rect(0, 0, bmp.bmWidth, bmp.bmHeight);
         }

         HBITMAP hBitmap = CreateCompatibleBitmap(this._handle, r.width, r.height);
         c._hBitmap = hBitmap;
         SelectObject(hdc, hBitmap); // Destroyed by Mem Canvas Object
      } else {
         SelectObject(hdc, b.handle); // This bitmap is not destroyed because the Bitmap object own his HBITMAP
      }

      return c;
   }

   public final Canvas createInMemory() {
      return this.createInMemory(null);
   }

   public static Canvas fromHDC(HDC hdc, bool owned = true) {
      return new Canvas(hdc, owned, CanvasType.fromControl);
   }
}

abstract class GraphicObject : Handle!(HGDIOBJ), IDisposable {
   protected bool _owned;

   protected this() {

   }

   protected this(HGDIOBJ hGdiObj, bool owned) {
      this._handle = hGdiObj;
      this._owned = owned;
   }

   public ~this() {
      this.dispose();
   }

   protected static int getInfo(T)(HGDIOBJ hGdiObj, ref T t) {
      return GetObjectW(hGdiObj, T.sizeof, &t);
   }

   public void dispose() {
      if (this._handle && this._owned) {
         DeleteObject(this._handle);
         this._handle = null;
      }
   }
}

abstract class Image : GraphicObject {
   protected this() {

   }

   @property public abstract Size size();
   @property public abstract ImageType type();

   protected this(HGDIOBJ hGdiObj, bool owned) {
      super(hGdiObj, owned);
   }
}

class Bitmap : Image {
   public this(Size sz) {
      HBITMAP hBitmap = this.createBitmap(sz.width, sz.height, RGB(0xFF, 0xFF, 0xFF));
      super(hBitmap, true);
   }

   public this(Size sz, Color bc) {
      HBITMAP hBitmap = this.createBitmap(sz.width, sz.height, bc.colorref);
      super(hBitmap, true);
   }

   public this(int w, int h) {
      HBITMAP hBitmap = this.createBitmap(w, h, RGB(0xFF, 0xFF, 0xFF));
      super(hBitmap, true);
   }

   public this(int w, int h, Color bc) {
      HBITMAP hBitmap = this.createBitmap(w, h, bc.colorref);
      super(hBitmap, true);
   }

   protected this(HBITMAP hBitmap, bool owned) {
      super(hBitmap, owned);
   }

   protected this(string fileName) {
      HBITMAP hBitmap = loadImage(null, fileName, IMAGE_BITMAP, 0, 0,
            LR_DEFAULTCOLOR | LR_DEFAULTSIZE | LR_LOADFROMFILE);

      if (!hBitmap) {
         throwException!(Win32Exception)("Cannot load Bitmap From File: '%s'", fileName);
      }

      super(hBitmap, true);
   }

   private static HBITMAP createBitmap(int w, int h, COLORREF backColor) {
      Rect r = Rect(0, 0, w, h);

      HDC hdc = GetWindowDC(null);
      HDC hcdc = CreateCompatibleDC(hdc);
      HBITMAP hBitmap = CreateCompatibleBitmap(hdc, w, h);
      HBITMAP hOldBitmap = SelectObject(hcdc, hBitmap);

      HBRUSH hBrush = CreateSolidBrush(backColor);
      FillRect(hcdc, &r.rect, hBrush);
      DeleteObject(hBrush);

      SelectObject(hcdc, hOldBitmap);
      DeleteDC(hcdc);
      ReleaseDC(null, hdc);

      return hBitmap;
   }

   /*
	 *  !!! Is this procedure useful? !!!
	 *
	public Bitmap alphaBlend(ubyte alpha)
	{
		if(!_gdiAlphaBlend)
		{
			_gdiAlphaBlend = cast(GdiAlphaBlendProc)GetProcAddress(getModuleHandle("gdi32.dll"), toStringz("GdiAlphaBlend"));
		}

		BITMAP b;
		getInfo!(BITMAP)(this._handle, b);

		HDC hdc = GetWindowDC(null);
		HDC hdc1 = CreateCompatibleDC(hdc);
		HDC hdc2 = CreateCompatibleDC(hdc);
		HBITMAP hBitmap = CreateCompatibleBitmap(hdc, b.bmWidth, b.bmHeight);
		HBITMAP hOldBitmap1 = SelectObject(hdc1, hBitmap);
		HBITMAP hOldBitmap2 = SelectObject(hdc2, this._handle);

		BLENDFUNCTION bf;
		bf.BlendOp = 0; // AC_SRC_OVER
		bf.SourceConstantAlpha = alpha;

		if(b.bmBitsPixel == 32) // Premultiply bits if Bitmap's bpp = 32bpp
		{
			BitmapData bd;
			Bitmap.getData(hBitmap, bd);

			for(int i = 0; i < bd.bitsCount; i++)
			{
				bd.bits[i].red = cast(ubyte)(bd.bits[i].red * (alpha / 0xFF));
				bd.bits[i].green = cast(ubyte)(bd.bits[i].green * (alpha / 0xFF));
				bd.bits[i].blue = cast(ubyte)(bd.bits[i].blue * (alpha / 0xFF));
			}

			Bitmap.setData(hBitmap, bd);

			bf.AlphaFormat = 1; // AC_SRC_ALPHA
		}

		_gdiAlphaBlend(hdc1, 0, 0, b.bmWidth, b.bmHeight, hdc2, 0, 0, b.bmWidth, b.bmHeight, bf);

		SelectObject(hdc2, hOldBitmap2);
		SelectObject(hdc1, hOldBitmap1);
		DeleteDC(hdc2);
		DeleteDC(hdc1);
		ReleaseDC(null, hdc);

		return Bitmap.fromHBITMAP(hBitmap);
	}
	*/

   public Bitmap clone() {
      BITMAP b;
      getInfo!(BITMAP)(this._handle, b);

      HDC hdc = GetDC(null);
      HDC hcdc1 = CreateCompatibleDC(hdc); // Contains this bitmap
      HDC hcdc2 = CreateCompatibleDC(hdc); // The Bitmap will be copied here
      HBITMAP hBitmap = CreateCompatibleBitmap(hdc, b.bmWidth, b.bmHeight); //Don't delete it, it will be deleted by the class Bitmap

      HBITMAP hOldBitmap1 = SelectObject(hcdc1, this._handle);
      HBITMAP hOldBitmap2 = SelectObject(hcdc2, hBitmap);

      BitBlt(hcdc2, 0, 0, b.bmWidth, b.bmHeight, hcdc1, 0, 0, SRCCOPY);
      SelectObject(hcdc2, hOldBitmap2);
      SelectObject(hcdc1, hOldBitmap1);

      DeleteDC(hcdc2);
      DeleteDC(hcdc1);
      ReleaseDC(null, hdc);

      Bitmap bmp = new Bitmap(hBitmap, true);
      return bmp;
   }

   public static void getData(HBITMAP hBitmap, ref BitmapData bd) {
      BITMAPINFO bi;
      bi.bmiHeader.biSize = BITMAPINFOHEADER.sizeof;
      bi.bmiHeader.biBitCount = 0;

      HDC hdc = GetWindowDC(null);
      GetDIBits(hdc, hBitmap, 0, 0, null, &bi, DIB_RGB_COLORS); // Get Bitmap Info

      bd.imageSize = bi.bmiHeader.biSizeImage;
      bd.bitsCount = bi.bmiHeader.biSizeImage / RGBQUAD.sizeof;
      bd.bits = cast(BitmapBit*)GC.malloc(bi.bmiHeader.biSizeImage);

      switch (bi.bmiHeader.biBitCount) // Calculate color table size (if needed)
      {
      case 24:
         bd.info = cast(BITMAPINFO*)GC.malloc(bi.bmiHeader.biSize);
         break;

      case 16, 32:
         bd.info = cast(BITMAPINFO*)GC.malloc(bi.bmiHeader.biSize + uint.sizeof * 3); // Needs Investigation
         break;

      default:
         bd.info = cast(BITMAPINFO*)GC.malloc(
               bi.bmiHeader.biSize + RGBQUAD.sizeof * (1 << bi.bmiHeader.biBitCount));
         break;
      }

      bd.info.bmiHeader = bi.bmiHeader;
      GetDIBits(hdc, hBitmap, 0, bd.info.bmiHeader.biHeight,
            cast(RGBQUAD*)bd.bits, bd.info, DIB_RGB_COLORS);
      ReleaseDC(null, hdc);
   }

   public void getData(ref BitmapData bd) {
      return Bitmap.getData(this._handle, bd);
   }

   private static void setData(HBITMAP hBitmap, ref BitmapData bd) {
      HDC hdc = GetWindowDC(null);
      SetDIBits(hdc, hBitmap, 0, bd.info.bmiHeader.biHeight,
            cast(RGBQUAD*)bd.bits, bd.info, DIB_RGB_COLORS);

      ReleaseDC(null, hdc);
      Bitmap.freeData(bd);
   }

   public void setData(ref BitmapData bd) {
      Bitmap.setData(this._handle, bd);
   }

   public static void freeData(ref BitmapData bd) {
      GC.free(bd.bits);
      GC.free(bd.info);
   }

   @property public override Size size() {
      BITMAP bmp = void; //Inizializzata da getInfo()

      getInfo!(BITMAP)(this._handle, bmp);
      return Size(bmp.bmWidth, bmp.bmHeight);
   }

   @property public override ImageType type() {
      return ImageType.bitmap;
   }

   public static Bitmap fromHBITMAP(HBITMAP hBitmap, bool owned = true) {
      return new Bitmap(hBitmap, owned);
   }

   public static Bitmap fromFile(string fileName) {
      return new Bitmap(fileName);
   }
}

class Icon : Image {
   protected this(HICON hIcon, bool owned) {
      super(hIcon, owned);
   }

   protected this(string fileName) {
      HICON hIcon;

      if (!icmp(std.path.extension(fileName), ".ico")) {
         hIcon = loadImage(null, fileName, IMAGE_ICON, 0, 0,
               LR_DEFAULTCOLOR | LR_DEFAULTSIZE | LR_LOADFROMFILE);
      } else {
         ushort dummy = 0;
         hIcon = extractAssociatedIcon(fileName, &dummy);
      }

      if (!hIcon) {
         throwException!(Win32Exception)("Cannot load Icon From File: '%s'", fileName);
      }

      super(hIcon, true);
   }

   public override void dispose() {
      if (this._handle && this._owned) {
         DestroyIcon(this._handle); // Use DestroyIcon() not DestroyObject()
      }
   }

   @property public override Size size() {
      ICONINFO ii = void; //Inizializzata da GetIconInfo()
      BITMAP bmp = void; //Inizializzata da getInfo()
      Size sz = void; //Inizializzata sotto.

      if (!GetIconInfo(this._handle, &ii)) {
         throwException!(Win32Exception)("Unable to get information from Icon");
      }

      if (ii.hbmColor) //Exists: Icon Color Bitmap
      {
         if (!getInfo!(BITMAP)(ii.hbmColor, bmp)) {
            throwException!(Win32Exception)("Unable to get Icon Color Bitmap");
         }

         sz.width = bmp.bmWidth;
         sz.height = bmp.bmHeight;
         DeleteObject(ii.hbmColor);
      } else {
         if (!getInfo!(BITMAP)(ii.hbmMask, bmp)) {
            throwException!(Win32Exception)("Unable to get Icon Mask");
         }

         sz.width = bmp.bmWidth;
         sz.height = bmp.bmHeight / 2;
      }

      DeleteObject(ii.hbmMask);
      return sz;
   }

   @property public override ImageType type() {
      return ImageType.iconOrCursor;
   }

   public Bitmap toBitmap(Size sz) {
      HDC hwdc = GetWindowDC(null);
      HDC hdc1 = CreateCompatibleDC(hwdc);

      HBITMAP hBitmap = CreateCompatibleBitmap(hwdc, sz.width, sz.height);
      HBITMAP hOldBitmap = SelectObject(hdc1, hBitmap);

      Rect r = Rect(nullPoint, sz);
      HBRUSH hBrush = CreateSolidBrush(RGB(255, 255, 255));
      FillRect(hdc1, &r.rect, hBrush);
      DeleteObject(hBrush);

      DrawIconEx(hdc1, 0, 0, this._handle, sz.width, sz.height, 0, null, DI_NORMAL);
      SelectObject(hdc1, hOldBitmap);
      DeleteDC(hdc1);
      ReleaseDC(null, hwdc);

      return Bitmap.fromHBITMAP(hBitmap);
   }

   public Bitmap toBitmap() {
      Size sz = this.size;
      return this.toBitmap(sz);
   }

   public static Icon fromHICON(HICON hIcon, bool owned = true) {
      return new Icon(hIcon, owned);
   }

   public static Icon fromFile(string fileName) {
      return new Icon(fileName);
   }
}

final class Cursor : Icon {
   protected this(HCURSOR hCursor, bool owned) {
      super(hCursor, owned);
   }

   public override void dispose() {
      if (this._handle && this._owned) {
         DestroyCursor(this._handle); // Use DestroyCursor() not DestroyObject()
      }
   }

   @property public static Point position() {
      Point pt;

      GetCursorPos(&pt.point);
      return pt;
   }

   public static Cursor fromHCURSOR(HCURSOR hCursor, bool owned = true) {
      return new Cursor(hCursor, owned);
   }
}

final class Font : GraphicObject {
   private static int _logPixelSY = 0;

   private bool _metricsDone = false;
   private FontMetrics _metrics;

   private this(HFONT hFont, bool owned) {
      super(hFont, owned);
   }

   private static void initLogPixelSY() {
      if (!_logPixelSY) {
         HDC hdc = GetWindowDC(null);
         _logPixelSY = GetDeviceCaps(hdc, LOGPIXELSY);
         ReleaseDC(null, hdc);
      }
   }

   public this(string name, int h, FontStyle style = FontStyle.normal) {
      Font.initLogPixelSY();

      LOGFONTW lf;
      lf.lfHeight = -MulDiv(h, _logPixelSY, 72);

      doStyle(style, lf);
      this._handle = createFontIndirect(name, &lf);
   }

   public this(Font f, FontStyle fs) {
      LOGFONTW lf;

      getInfo!(LOGFONTW)(f.handle, lf);
      doStyle(fs, lf);
      this._handle = createFontIndirect(&lf);
   }

   @property public string name() {
      LOGFONTW lf;

      getInfo!(LOGFONTW)(this._handle, lf);
      int idx = indexOf(lf.lfFaceName, '\0');
      return to!(string)(lf.lfFaceName[0 .. idx]);
   }

   @property public int height() {
      LOGFONTW lf;

      Font.initLogPixelSY();

      getInfo!(LOGFONTW)(this._handle, lf);
      return -MulDiv(72, lf.lfHeight, _logPixelSY);
   }

   @property public FontMetrics metrics() {
      if (!this._metricsDone) {
         TEXTMETRICW tm;

         HDC hdc = CreateCompatibleDC(null);
         HFONT hOldFont = SelectObject(hdc, this._handle);
         GetTextMetricsW(hdc, &tm);
         SelectObject(hdc, hOldFont);
         DeleteDC(hdc);

         this._metrics.height = tm.tmHeight;
         this._metrics.ascent = tm.tmAscent;
         this._metrics.descent = tm.tmDescent;
         this._metrics.internalLeading = tm.tmInternalLeading;
         this._metrics.externalLeading = tm.tmExternalLeading;
         this._metrics.averageCharWidth = tm.tmAveCharWidth;
         this._metrics.maxCharWidth = tm.tmMaxCharWidth;

         this._metricsDone = true;
      }

      return this._metrics;
   }

   private static void doStyle(FontStyle style, ref LOGFONTW lf) {
      lf.lfCharSet = DEFAULT_CHARSET;
      lf.lfWeight = FW_NORMAL;
      //lf.lfItalic = FALSE;    Inizializzata dal compilatore
      //lf.lfStrikeOut = FALSE; Inizializzata dal compilatore
      //lf.lfUnderline = FALSE; Inizializzata dal compilatore

      if (style & FontStyle.bold) {
         lf.lfWeight = FW_BOLD;
      }

      if (style & FontStyle.italic) {
         lf.lfItalic = 1;
      }

      if (style & FontStyle.strikeout) {
         lf.lfStrikeOut = 1;
      }

      if (style & FontStyle.underline) {
         lf.lfUnderline = 1;
      }
   }

   public static Font fromHFONT(HFONT hFont, bool owned = true) {
      return new Font(hFont, owned);
   }
}

abstract class Brush : GraphicObject {
   protected this(HBRUSH hBrush, bool owned) {
      super(hBrush, owned);
   }
}

class SolidBrush : Brush {
   private Color _color;

   protected this(HBRUSH hBrush, bool owned) {
      super(hBrush, owned);
   }

   public this(Color color) {
      this._color = color;
      super(CreateSolidBrush(color.colorref), true);
   }

   @property public final Color color() {
      return this._color;
   }

   public static SolidBrush fromHBRUSH(HBRUSH hBrush, bool owned = true) {
      return new SolidBrush(hBrush, owned);
   }
}

class HatchBrush : Brush {
   private Color _color;
   private HatchStyle _style;

   protected this(HBRUSH hBrush, bool owned) {
      super(hBrush, owned);
   }

   public this(Color color, HatchStyle style) {
      this._color = color;
      this._style = style;

      super(CreateHatchBrush(style, color.colorref), true);
   }

   @property public final Color color() {
      return this._color;
   }

   @property public final HatchStyle style() {
      return this._style;
   }

   public static HatchBrush fromHBRUSH(HBRUSH hBrush, bool owned = true) {
      return new HatchBrush(hBrush, owned);
   }
}

class PatternBrush : Brush {
   private Bitmap _bmp;

   protected this(HBRUSH hBrush, bool owned) {
      super(hBrush, owned);
   }

   public this(Bitmap bmp) {
      this._bmp = bmp;
      super(CreatePatternBrush(bmp.handle), true);
   }

   @property public final Bitmap bitmap() {
      return this._bmp;
   }

   public static PatternBrush fromHBRUSH(HBRUSH hBrush, bool owned = true) {
      return new PatternBrush(hBrush, owned);
   }
}

final class Pen : GraphicObject {
   private PenStyle _style;
   private Color _color;
   private int _width;

   protected this(HPEN hPen, bool owned) {
      super(hPen, owned);
   }

   public this(Color color, int width = 1, PenStyle style = PenStyle.solid) {
      this._color = color;
      this._width = width;
      this._style = style;

      this._handle = CreatePen(style, width, color.colorref);

      super(this._handle, true);
   }

   @property public PenStyle style() {
      return this._style;
   }

   @property public int width() {
      return this._width;
   }

   @property public Color color() {
      return this._color;
   }

   public static Pen fromHPEN(HPEN hPen, bool owned = true) {
      return new Pen(hPen, owned);
   }
}

final class SystemPens {
   @property public static Pen nullPen() {
      return Pen.fromHPEN(GetStockObject(NULL_PEN), false);
   }

   @property public static Pen blackPen() {
      return Pen.fromHPEN(GetStockObject(BLACK_PEN), false);
   }

   @property public static Pen whitePen() {
      return Pen.fromHPEN(GetStockObject(WHITE_PEN), false);
   }
}

final class SystemIcons {
   @property public static Icon application() {
      static Icon ico;

      if (!ico) {
         HICON hIco = loadImage(null, cast(wchar*)IDI_APPLICATION, IMAGE_ICON,
               0, 0, LR_SHARED | LR_DEFAULTCOLOR | LR_DEFAULTSIZE);
         ico = Icon.fromHICON(hIco);
      }

      return ico;
   }

   @property public static Icon asterisk() {
      static Icon ico;

      if (!ico) {
         HICON hIco = loadImage(null, IDI_ASTERISK, IMAGE_ICON, 0, 0,
               LR_SHARED | LR_DEFAULTCOLOR | LR_DEFAULTSIZE);
         ico = Icon.fromHICON(hIco);
      }

      return ico;
   }

   @property public static Icon error() {
      static Icon ico;

      if (!ico) {
         HICON hIco = loadImage(null, IDI_ERROR, IMAGE_ICON, 0, 0,
               LR_SHARED | LR_DEFAULTCOLOR | LR_DEFAULTSIZE);
         ico = Icon.fromHICON(hIco);
      }

      return ico;
   }

   @property public static Icon question() {
      static Icon ico;

      if (!ico) {
         HICON hIco = loadImage(null, IDI_QUESTION, IMAGE_ICON, 0, 0,
               LR_SHARED | LR_DEFAULTCOLOR | LR_DEFAULTSIZE);
         ico = Icon.fromHICON(hIco);
      }

      return ico;
   }

   @property public static Icon warning() {
      static Icon ico;

      if (!ico) {
         HICON hIco = loadImage(null, IDI_WARNING, IMAGE_ICON, 0, 0,
               LR_SHARED | LR_DEFAULTCOLOR | LR_DEFAULTSIZE);
         ico = Icon.fromHICON(hIco);
      }

      return ico;
   }
}

final class SystemBrushes {
   @property public static SolidBrush blackBrush() {
      return SolidBrush.fromHBRUSH(GetStockObject(BLACK_BRUSH), false);
   }

   @property public static SolidBrush darkGrayBrush() {
      return SolidBrush.fromHBRUSH(GetStockObject(DKGRAY_BRUSH), false);
   }

   @property public static SolidBrush grayBrush() {
      return SolidBrush.fromHBRUSH(GetStockObject(GRAY_BRUSH), false);
   }

   @property public static SolidBrush lightGrayBrush() {
      return SolidBrush.fromHBRUSH(GetStockObject(LTGRAY_BRUSH), false);
   }

   @property public static SolidBrush nullBrush() {
      return SolidBrush.fromHBRUSH(GetStockObject(NULL_BRUSH), false);
   }

   @property public static SolidBrush whiteBrush() {
      return SolidBrush.fromHBRUSH(GetStockObject(WHITE_BRUSH), false);
   }

   @property public static SolidBrush brush3DDarkShadow() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_3DDKSHADOW), false);
   }

   @property public static SolidBrush brush3DFace() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_3DFACE), false);
   }

   @property public static SolidBrush brushButtonFace() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_BTNFACE), false);
   }

   @property public static SolidBrush brush3DLight() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_3DLIGHT), false);
   }

   @property public static SolidBrush brush3DShadow() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_3DSHADOW), false);
   }

   @property public static SolidBrush brushActiveBorder() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_ACTIVEBORDER), false);
   }

   @property public static SolidBrush brushActiveCaption() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_3DLIGHT), false);
   }

   @property public static SolidBrush brushAppWorkspace() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_APPWORKSPACE), false);
   }

   @property public static SolidBrush brushBackground() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_BACKGROUND), false);
   }

   @property public static SolidBrush brushButtonText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_BTNTEXT), false);
   }

   @property public static SolidBrush brushCaptionText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_CAPTIONTEXT), false);
   }

   @property public static SolidBrush brushGrayText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_GRAYTEXT), false);
   }

   @property public static SolidBrush brushHighlight() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_HIGHLIGHT), false);
   }

   @property public static SolidBrush brushHighlightText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_HIGHLIGHTTEXT), false);
   }

   @property public static SolidBrush brushInactiveBorder() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_INACTIVEBORDER), false);
   }

   @property public static SolidBrush brushInactiveCaption() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_INACTIVECAPTION), false);
   }

   @property public static SolidBrush brushInactiveCaptionText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_INACTIVECAPTIONTEXT), false);
   }

   @property public static SolidBrush brushInfo() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_INFOBK), false);
   }

   @property public static SolidBrush brushInfoText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_INFOTEXT), false);
   }

   @property public static SolidBrush brushMenu() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_MENU), false);
   }

   @property public static SolidBrush brushMenuText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_MENUTEXT), false);
   }

   @property public static SolidBrush brushScrollBar() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_SCROLLBAR), false);
   }

   @property public static SolidBrush brushWindow() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_WINDOW), false);
   }

   @property public static SolidBrush brushWindowFrame() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_WINDOW), false);
   }

   @property public static SolidBrush brushWindowText() {
      return SolidBrush.fromHBRUSH(GetSysColorBrush(COLOR_WINDOWTEXT), false);
   }
}

final class SystemFonts {
   @property public static Font windowsFont() {
      static Font f;

      if (!f) {
         NONCLIENTMETRICSW ncm = void; //La inizializza sotto.
         ncm.cbSize = NONCLIENTMETRICSW.sizeof;

         if (SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, NONCLIENTMETRICSW.sizeof, &ncm, 0)) {
            f = Font.fromHFONT(createFontIndirect(&ncm.lfMessageFont), false);
         } else {
            f = SystemFonts.ansiVarFont;
         }
      }

      return f;
   }

   @property public static Font ansiFixedFont() {
      static Font f;

      if (!f) {
         f = Font.fromHFONT(GetStockObject(ANSI_FIXED_FONT), false);
      }

      return f;
   }

   @property public static Font ansiVarFont() {
      static Font f;

      if (!f) {
         f = Font.fromHFONT(GetStockObject(ANSI_VAR_FONT), false);
      }

      return f;
   }

   @property public static Font deviceDefaultFont() {
      static Font f;

      if (!f) {
         f = Font.fromHFONT(GetStockObject(DEVICE_DEFAULT_FONT), false);
      }

      return f;
   }

   @property public static Font oemFixedFont() {
      static Font f;

      if (!f) {
         f = Font.fromHFONT(GetStockObject(OEM_FIXED_FONT), false);
      }

      return f;
   }

   @property public static Font systemFont() {
      static Font f;

      if (!f) {
         f = Font.fromHFONT(GetStockObject(SYSTEM_FONT), false);
      }

      return f;
   }

   @property public static Font systemFixedFont() {
      static Font f;

      if (!f) {
         f = Font.fromHFONT(GetStockObject(SYSTEM_FIXED_FONT), false);
      }

      return f;
   }
}

final class SystemCursors {
   @property public static Cursor appStarting() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(getHInstance(), IDC_APPSTARTING,
               IMAGE_CURSOR, 0, 0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor arrow() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_ARROW, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor cross() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, cast(wchar*)IDC_CROSS,
               IMAGE_CURSOR, 0, 0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor iBeam() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_IBEAM, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor icon() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_ICON, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor no() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_NO, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor sizeAll() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_SIZEALL, IMAGE_CURSOR, 0,
               0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor sizeNESW() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_SIZENESW, IMAGE_CURSOR, 0,
               0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor sizeNS() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_SIZENS, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor sizeNWSE() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_SIZENWSE, IMAGE_CURSOR, 0,
               0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor sizeWE() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_SIZEWE, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor upArrow() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_UPARROW, IMAGE_CURSOR, 0,
               0, LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }

   @property public static Cursor wait() {
      static Cursor c;

      if (!c) {
         c = Cursor.fromHCURSOR(loadImage(null, IDC_WAIT, IMAGE_CURSOR, 0, 0,
               LR_DEFAULTSIZE | LR_DEFAULTCOLOR | LR_SHARED), false);
      }

      return c;
   }
}

final class SystemColors {
   @property public static Color red() {
      return Color(0xFF, 0x00, 0x00);
   }

   @property public static Color green() {
      return Color(0x00, 0xFF, 0x00);
   }

   @property public static Color blue() {
      return Color(0x00, 0x00, 0xFF);
   }

   @property public static Color black() {
      return Color(0x00, 0x00, 0x00);
   }

   @property public static Color white() {
      return Color(0xFF, 0xFF, 0xFF);
   }

   @property public static Color yellow() {
      return Color(0xFF, 0xFF, 0x00);
   }

   @property public static Color magenta() {
      return Color(0xFF, 0x00, 0xFF);
   }

   @property public static Color magicPink() {
      return SystemColors.magenta; //Is 'Magic Pink'
   }

   @property public static Color cyan() {
      return Color(0x00, 0xFF, 0xFF);
   }

   @property public static Color darkGray() {
      return Color(0xA9, 0xA9, 0xA9);
   }

   @property public static Color lightGray() {
      return Color(0xD3, 0xD3, 0xD3);
   }

   @property public static Color darkRed() {
      return Color(0x8B, 0x00, 0x00);
   }

   @property public static Color darkGreen() {
      return Color(0x00, 0x64, 0x00);
   }

   @property public static Color darkBlue() {
      return Color(0x00, 0x00, 0x8B);
   }

   @property public static Color darkYellow() {
      return Color(0x00, 0x80, 0x80);
   }

   @property public static Color darkMagenta() {
      return Color(0x80, 0x00, 0x80);
   }

   @property public static Color darkCyan() {
      return Color(0x80, 0x80, 0x00);
   }

   @property public static Color transparent() {
      return Color(0x00, 0x00, 0x00, 0x00);
   }

   @property public static Color color3DDarkShadow() {
      return Color.fromCOLORREF(GetSysColor(COLOR_3DDKSHADOW));
   }

   @property public static Color color3DFace() {
      return Color.fromCOLORREF(GetSysColor(COLOR_3DFACE));
   }

   @property public static Color colorButtonFace() {
      return Color.fromCOLORREF(GetSysColor(COLOR_BTNFACE));
   }

   @property public static Color color3DLight() {
      return Color.fromCOLORREF(GetSysColor(COLOR_3DLIGHT));
   }

   @property public static Color color3DShadow() {
      return Color.fromCOLORREF(GetSysColor(COLOR_3DSHADOW));
   }

   @property public static Color colorActiveBorder() {
      return Color.fromCOLORREF(GetSysColor(COLOR_ACTIVEBORDER));
   }

   @property public static Color colorActiveCaption() {
      return Color.fromCOLORREF(GetSysColor(COLOR_3DLIGHT));
   }

   @property public static Color colorAppWorkspace() {
      return Color.fromCOLORREF(GetSysColor(COLOR_APPWORKSPACE));
   }

   @property public static Color colorBackground() {
      return Color.fromCOLORREF(GetSysColor(COLOR_BACKGROUND));
   }

   @property public static Color colorButtonText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_BTNTEXT));
   }

   @property public static Color colorCaptionText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_CAPTIONTEXT));
   }

   @property public static Color colorGrayText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_GRAYTEXT));
   }

   @property public static Color colorHighlight() {
      return Color.fromCOLORREF(GetSysColor(COLOR_HIGHLIGHT));
   }

   @property public static Color colorHighlightText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_HIGHLIGHTTEXT));
   }

   @property public static Color colorInactiveBorder() {
      return Color.fromCOLORREF(GetSysColor(COLOR_INACTIVEBORDER));
   }

   @property public static Color colorInactiveCaption() {
      return Color.fromCOLORREF(GetSysColor(COLOR_INACTIVECAPTION));
   }

   @property public static Color colorInactiveCaptionText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_INACTIVECAPTIONTEXT));
   }

   @property public static Color colorInfo() {
      return Color.fromCOLORREF(GetSysColor(COLOR_INFOBK));
   }

   @property public static Color colorInfoText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_INFOTEXT));
   }

   @property public static Color colorMenu() {
      return Color.fromCOLORREF(GetSysColor(COLOR_MENU));
   }

   @property public static Color colorMenuText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_MENUTEXT));
   }

   @property public static Color colorScrollBar() {
      return Color.fromCOLORREF(GetSysColor(COLOR_SCROLLBAR));
   }

   @property public static Color colorWindow() {
      return Color.fromCOLORREF(GetSysColor(COLOR_WINDOW));
   }

   @property public static Color colorWindowFrame() {
      return Color.fromCOLORREF(GetSysColor(COLOR_WINDOW));
   }

   @property public static Color colorWindowText() {
      return Color.fromCOLORREF(GetSysColor(COLOR_WINDOWTEXT));
   }
}

final class TextFormat {
   private TextTrimming _trim = TextTrimming.none; // TextTrimming.CHARACTER.
   private TextFormatFlags _flags = TextFormatFlags.noPrefix | TextFormatFlags.wordBreak;
   private TextAlignment _align = TextAlignment.left;
   private DRAWTEXTPARAMS _params = {DRAWTEXTPARAMS.sizeof, 8, 0, 0};

   public this() {

   }

   public this(TextFormat tf) {
      this._trim = tf._trim;
      this._flags = tf._flags;
      this._align = tf._align;
      this._params = tf._params;
   }

   public this(TextFormatFlags tff) {
      this._flags = tff;
   }

   @property public TextAlignment alignment() {
      return this._align;
   }

   @property public void alignment(TextAlignment ta) {
      this._align = ta;
   }

   @property public void formatFlags(TextFormatFlags tff) {
      this._flags = tff;
   }

   @property public TextFormatFlags formatFlags() {
      return this._flags;
   }

   @property public void trimming(TextTrimming tt) {
      this._trim = tt;
   }

   @property public TextTrimming trimming() {
      return this._trim;
   }

   @property public int tabLength() {
      return _params.iTabLength;
   }

   @property public void tabLength(int tablen) {
      this._params.iTabLength = tablen;
   }

   @property public int leftMargin() {
      return this._params.iLeftMargin;
   }

   @property public void leftMargin(int sz) {
      this._params.iLeftMargin = sz;
   }

   @property public int rightMargin() {
      return this._params.iRightMargin;
   }

   @property public void rightMargin(int sz) {
      this._params.iRightMargin = sz;
   }
}

final class Screen {
   @property public static Size size() {
      Size sz = void; //Inizializzata sotto

      sz.width = GetSystemMetrics(SM_CXSCREEN);
      sz.height = GetSystemMetrics(SM_CYSCREEN);

      return sz;
   }

   @property public static Rect workArea() {
      Rect r = void; //Inizializzata sotto

      SystemParametersInfoW(SPI_GETWORKAREA, 0, &r.rect, 0);
      return r;
   }

   @property public static Canvas canvas() {
      return Canvas.fromHDC(GetWindowDC(null));
   }
}