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|
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, StdCtrls, shellapi, Jpeg, Menus, Buttons, ComCtrls;
type
TForm1 = class(TForm)
BTest: TButton;
procedure FormCreate(Sender: TObject);
private
{ Déclarations privées }
public
{ Déclarations publiques }
end;
TMyHintWindow = class(THintWindow)
private
JPG : TJPegImage;
Bmp,bmpbis: Tbitmap;
BMPLoaded : boolean;
NewW, NewH, OldSBM: Integer;
protected
procedure Paint; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure JPEGToBMP(JPG : TJPegImage; BMP : TBitmap);
begin
BMP.Width := JPG.Width;
BMP.Height:= JPG.Height;
BMP.PixelFormat := pf24bit;
BMP.Canvas.Draw(0,0,JPG);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
HintWindowClass := TMyHintWindow;
ShowHint := true;
BTest.Hint := ' ' ;
end;
constructor TMyHintWindow.Create(AOwner: TComponent);
begin
inherited;
BMPLoaded := false;
{ creation du Jpg temporaire }
jpg:= TJPEGImage.Create;
{ creation du bitmap temporaire }
bmp:=Tbitmap.Create;
{ creation du bitmap bis temporaire }
bmpbis:=Tbitmap.Create;
try
{ Chargement de l'image jpg }
jpg.loadFromFile('C:\Hint640x480.jpg');
{ convertion JPG > BMP }
JPEGToBMP(JPG,BMP);
{ BMP est prét }
BMPLoaded := true;
{ si BMP est prét }
if BMPLoaded then
begin
NewW := 160; //Dimensions width du Hint
NewH := 130; //Dimensions height du Hint
end;
{ enfin on va injecter Bmp dans le bitmap de bmpbis}
with bmpbis do
begin
{ on definit les nouvelles dimensions }
width := NewW ;
height := NewH;
{ on travail en couleurs 24bpc }
pixelformat := pf24bit;
{ on sauvegarde l'ancien mode de redimension du canvas }
OldSBM := GetStretchBltMode(Canvas.Handle);
{ et on le definit en mode HALFTONE }
SetStretchBltMode(Canvas.Handle, HALFTONE);
{ on dessine l'image }
StretchBlt( Canvas.Handle, 0, 0, NewW, NewH,
bmp.Canvas.Handle, 0, 0, bmp.Width, bmp.Height,
SRCCOPY);
{ on restaure le mode de redimensionnement du canvas }
SetStretchBltMode(Canvas.Handle, OldSBM);
{ on assigne }
jpg.Assign(bmpbis);
end;
except
FreeAndNil(jpg);
FreeAndNil(bmp);
FreeAndNil(bmpbis);
end;
end;
destructor TMyHintWindow.Destroy;
begin
bmp.Free;
bmpbis.free;
jpg.Free;
inherited;
end;
procedure TMyHintWindow.Paint;
var DC: HDC;
R: TRect;
begin
if Assigned(jpg) then
Canvas.Draw(1, 2, jpg);
inherited;
DC := GetWindowDC(Handle);
try
Height:=jpg.Height;
width:=jpg.width;
R := Rect(0, 0, Width, Height);
DrawEdge(DC, R, EDGE_ETCHED , BF_RECT + BF_MONO);
finally
ReleaseDC(Handle, DC);
end;
end;
end. |
Pb sur une image dans un Hint
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