Delphi的Hint(2)

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Delphi的Hint(2)

来源: 作者: 时间:2016-02-05 11:47 【

上一篇介绍了Hint的简单应用,这一篇将给出一个定制Hint窗口的例子。这个自定义Hint窗口的效果不错,以玻璃为边框,并且有阴影的效果。不过这之前,我们必须介绍一个如何定制,
上一篇介绍了Hint的简单应用,这一篇将给出一个定制Hint窗口的例子。这个自定义Hint窗口的效果不错,以玻璃为边框,并且有阴影的效果。

不过这之前,我们必须介绍一个如何定制,Hint的父类为THintWindow,在Controls单元中定义。我们看看几个虚拟方法,CreateParams设定窗口的风格,我们要覆盖掉它,使其没有边框。NCPaint画窗口的边框,我们也要覆盖它,因为我们不需要边框吗。Paint比较重要,为画Hint窗口客户区内容,当然要覆盖。不过最重要的当属ActivateHint,它会设定好窗口的大小,并显示它,我们就在这里定制一个类玻璃的窗口效果。下面给出该类的实现:

unit wdHintWnd;

 

interface

uses

  Windows, Classes, Controls, Graphics, Forms, SysUtils, ExtCtrls;

 

 

type

  TwdHintWnd = class(THintWindow)

  private

    FWndBmp: TBitmap;   //窗口位图

    FHintBmp: TBitmap;  //提示信息位图

  protected

    procedure CreateParams(var Params: TCreateParams); override;

    procedure Paint; override;

    procedure NCPaint(DC: HDC); override;

    {画提示的图象}

    procedure DrawHintImg(Bmp:TBitmap; AHint: string);

    {取得提示窗口对应的桌面区域的图象}

    procedure GetDesktopImg(Bmp: TBitmap; R: TRect);

    {对桌面区域图象作处理,使其看起来像一块玻璃且带有一点阴影}

    procedure EffectHandle(WndBmp, HintBmp: TBitmap);

  public

    constructor Create(Aowner: TComponent); override;

    destructor Destroy; override;

    procedure ActivateHint(Rect: TRect; const AHint: string); override;

  end;

 

 

implementation

 

 

{ TwdHintWnd }

 

 

procedure TwdHintWnd.ActivateHint(Rect: TRect; const AHint: string);

var

  P: TPoint;

begin

  //在这里取得一个适当的尺寸显示文字

  FHintBmp.Width := Rect.Right - Rect.Left;

  FHintBmp.Height := Rect.Bottom - Rect.Top + 4;

  DrawHintImg(FHintBmp, AHint);

  FWndBmp.Width := Rect.Right - Rect.Left + 23;

  FWndBmp.Height := Rect.Bottom - Rect.Top + 27;

  Inc(Rect.Right, 23);

  Inc(Rect.Bottom, 27);

  BoundsRect := Rect;

  if Left < Screen.DesktopLeft then

     Left := Screen.DesktopLeft;

  if Top < Screen.DesktopTop then

    Top := Screen.DesktopTop;

  if Left + Width > Screen.DesktopWidth then

    Left := Screen.DesktopWidth - Width;

  if Top + Height > Screen.DesktopHeight then

    Top := Screen.DesktopHeight - Height;

  GetDesktopImg(FWndBmp, BoundsRect);

  EffectHandle(FWndBmp, FHintBmp);

  P := ClientToScreen(Point(0, 0));

  SetWindowPos(Handle, HWND_TOPMOST, P.X, P.Y, 0, 0,

    S_SHOWWINDOW or SWP_NOACTIVATE or SWP_NOSIZE);

end;

 

 

constructor TwdHintWnd.Create(Aowner: TComponent);

begin

  inherited;

  FWndBmp := TBitmap.Create;

  FWndBmp.PixelFormat := pf24bit;

  FHintBmp := TBitmap.Create;

end;

 

 

procedure TwdHintWnd.CreateParams(var Params: TCreateParams);

begin

  inherited;

  //去掉窗口边框

  Params.Style := Params.Style and not WS_BORDER;

end;

 

 

destructor TwdHintWnd.Destroy;

begin

  FWndBmp.Free;

  FHintBmp.Free;

  inherited;

end;

 

 

procedure TwdHintWnd.GetDesktopImg(Bmp: TBitmap; R: TRect);

var

  C: TCanvas;

begin

  C:= TCanvas.Create;

  try

    C.Handle := GetDC(0);

    Bmp.Canvas.CopyRect(Rect(0, 0, Bmp.Width, Bmp.Height), C, R);

  finally

    C.Free;

  end;

end;

 

 

procedure TwdHintWnd.EffectHandle(WndBmp, HintBmp: TBitmap);

var

  R: TRect;

  i, j: Integer;

  P: PByteArray;

  Transt, TranstAngle: Integer;

begin

  R := Rect(0, 0, WndBmp.Width - 4, WndBmp.Height - 4);

  Frame3D(WndBmp.Canvas, R, clMedGray, clBtnShadow, 1);

  //作窗口底下的阴影效果

  Transt := 60;

  for j:= WndBmp.Height - 4 to WndBmp.Height - 1 do

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