glassutils.pas

delphi 实现的玻璃效果

{**********************************************************}
{ 摘要： 玻璃效果的绘制                                        }
{                                                          }
{ 作者： LinZhenqun                                         }
{ 日期： 2007-10-5                                          }
{ 邮件： [e-mail]                               }
{**********************************************************}

unit GlassUtils;

interface
uses
  Graphics, Windows, Classes;

type
  { 渐变API的声明 }
  PTriVertex = ^TTriVertex;
  TTriVertex = packed record
    x: Longint;
    y: Longint;
    Red: WORD;
    Green: WORD;
    Blue: WORD;
    Alpha: WORD;
  end;
function GradientFill(DC: HDC; Vertex: PTriVertex; NumVertex: ULONG;
  Mesh: Pointer; NumMesh, Mode: ULONG): BOOL; stdcall;

type
  {渐变方向: 从左到右，从上到下}
  TGradDirection = (gdLeftRight, gdTopBottom);
    
  { 玻璃效果的颜色配置 }
  TGlassColorCfg = record
    OutBorder,        //外框，如果为clNone将不绘制
    InBorder,         //内框，如果为clNone将不绘制
    Grad1Start,       //上半部分渐变的开始颜色
    Grad1End,         //上半部分渐变的结束颜色
    Grad2Start,       //下半部分渐变的开始颜色
    Grad2End: TColor  //下半部分渐变的结束颜色
  end;
  
var
  { 默认颜色配置，蓝色玻璃 }
  DefGlassColorCfg: TGlassColorCfg = (OutBorder: clBlack; 

InBorder: $00E1D0AA;

Grad1Start: $00D1AE7A; 

Grad1End: $00B98835; 

Grad2Start: $00975F00; 

Grad2End: $00C6A46A);

{ 颜色值转RGB }
procedure GetRGB(C: TColor; out R, G, B: Integer);

{ 渐变函数 }
procedure FillGradient(const Canvas: TCanvas; const ARect: TRect;
  const StartColor, EndColor: TColor; const Direction: TGradDirection);

{ 玻璃效果绘制函数 }
procedure DrawGlassFace(Canvas: TCanvas; ARect: TRect;
  const GlassColorCfg: TGlassColorCfg);

implementation

function GradientFill; external msimg32;

procedure GetRGB(C: TColor; out R, G, B: Integer);
begin
  if Integer(C) < 0 then C := GetSysColor(C and $000000FF);
  R := C and $FF;
  G := C shr 8 and $FF;
  B := C shr 16 and $FF;
end;

procedure FillGradient(const Canvas: TCanvas; const ARect: TRect;
  const StartColor, EndColor: TColor; const Direction: TGradDirection);
var
  Vert: array[0..1] of TTriVertex;
  gRect: TGradientRect;
  nMode: Cardinal;
  R, G, B: Integer;
begin
  vert[0].x := ARect.Left;
  vert[0].y := ARect.Top;
  GetRGB(StartColor, R, G, B);
  Vert[0].Red := R shl 8;
  Vert[0].Green := G shl 8;
  Vert[0].Blue := B shl 8;
  vert[0].Alpha := 0;

  vert[1].x := ARect.Right;
  vert[1].y := ARect.Bottom;
  GetRGB(EndColor, R, G, B);
  Vert[1].Red := R shl 8;
  Vert[1].Green := G shl 8;
  Vert[1].Blue := B shl 8;
  vert[1].Alpha := 0;

  gRect.UpperLeft := 0;
  gRect.LowerRight := 1;
  if Direction = gdLeftRight then
    nMode := GRADIENT_FILL_RECT_H
  else
    nMode := GRADIENT_FILL_RECT_V;

  GradientFill(Canvas.Handle, @vert, 2, @gRect, 1, nMode);
end;

procedure DrawGlassFace(Canvas: TCanvas; ARect: TRect;
  const GlassColorCfg: TGlassColorCfg);
var
  R: TRect;
begin
  Canvas.Brush.Style := bsClear;
  with GlassColorCfg do
  begin
    if OutBorder <> clNone then
    begin
      //外框
      Canvas.Pen.Color := OutBorder;
      Canvas.Rectangle(ARect);
    end;
    if InBorder <> clNone then
    begin
      //内框
      InflateRect(ARect, -1, -1);
      Canvas.Pen.Color := InBorder;
      Canvas.Rectangle(ARect);
    end;
    //上下渐变效果
    InflateRect(ARect, -1, -1);
    with ARect do
      R := Rect(Left, Top, Right, Top + (Bottom - Top) div 2);
    FillGradient(Canvas, R, Grad1Start, Grad1End, gdTopBottom);
      R := Rect(R.Left, R.Bottom, R.Right, ARect.Bottom);
    FillGradient(Canvas, R, Grad2Start, Grad2End, gdTopBottom);
  end;
end;

end.