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| unit Frm_SLTImageScrolling;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ComCtrls, Vcl.StdCtrls, Vcl.Buttons,
Vcl.ExtCtrls, Vcl.FileCtrl, System.IOUtils, System.Types, PngImage, Jpeg;
type
TSLTImageScrollingForm = class(TForm)
PaintBoxScrolling: TPaintBox;
pnlTop: TPanel;
TimerScrolling: TTimer;
btnStart: TBitBtn;
btnStop: TBitBtn;
TrackBarTimerInterval: TTrackBar;
TrackBarScrollingStep: TTrackBar;
procedure TrackBarTimerIntervalChange(Sender: TObject);
procedure btnStartClick(Sender: TObject);
procedure btnStopClick(Sender: TObject);
procedure PaintBoxScrollingDblClick(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure TimerScrollingTimer(Sender: TObject);
private
{ Déclarations privées }
FDirectory: string;
FFileNames: TStringList;
FImageIndex: Integer;
FImageLeft: Integer;
procedure FillFileNames();
public
{ Déclarations publiques }
end;
var
SLTImageScrollingForm: TSLTImageScrollingForm;
implementation
{$R *.dfm}
procedure TSLTImageScrollingForm.btnStartClick(Sender: TObject);
begin
TimerScrolling.Interval := TrackBarTimerInterval.Position;
TimerScrolling.Enabled := True;
end;
procedure TSLTImageScrollingForm.btnStopClick(Sender: TObject);
begin
TimerScrolling.Enabled := False;
end;
procedure TSLTImageScrollingForm.FillFileNames();
var
FileNameArray: System.Types.TStringDynArray;
I: Integer;
begin
FileNameArray := System.IOUtils.TDirectory.GetFiles(FDirectory, '*.*', TSearchOption.soTopDirectoryOnly);
if not Assigned(FFileNames) then
FFileNames := TStringList.Create(True) // OwnsObjects dans la TStringList comme si c'était une TObjectList
else
FFileNames.Clear();
for I := Low(FileNameArray) to High(FileNameArray) do
FFileNames.Add(FileNameArray[I]);
end;
procedure TSLTImageScrollingForm.FormDestroy(Sender: TObject);
begin
FreeAndNil(FFileNames);
end;
procedure TSLTImageScrollingForm.PaintBoxScrollingDblClick(Sender: TObject);
begin
if Vcl.FileCtrl.SelectDirectory('Dossier des Images', '', FDirectory, [sdNewUI, sdShowFiles]) then
begin
TimerScrolling.Enabled := False;
FillFileNames();
TimerScrolling.Interval := TrackBarTimerInterval.Position;
TimerScrolling.Enabled := True;
end;
end;
procedure TSLTImageScrollingForm.TimerScrollingTimer(Sender: TObject);
procedure DrawImage(const AIndex, ALeft: Integer; out AWidth: Integer);
var
Picture: TPicture;
Bitmap: TBitmap;
NextIndex: Integer;
Dummy: Integer;
begin
AWidth := -1;
if AIndex < FFileNames.Count then
begin
Bitmap := FFileNames.Objects[AIndex] as TBitmap;
if Assigned(Bitmap) then
begin
PaintBoxScrolling.Canvas.Draw(ALeft, 0, Bitmap);
AWidth := Bitmap.Width;
NextIndex := AIndex + 1;
end
else
begin
Picture := TPicture.Create();
try
try
Picture.LoadFromFile(FFileNames[AIndex]);
AWidth := Picture.Width;
Bitmap := TBitmap.Create();
try
Bitmap.Assign(Picture.Graphic);
PaintBoxScrolling.Canvas.Draw(ALeft, 0, Bitmap);
NextIndex := AIndex + 1;
FFileNames.Objects[AIndex] := Bitmap;
finally
if FFileNames.Objects[AIndex] <> Bitmap then
Bitmap.Free();
end;
except
FFileNames.Delete(AIndex);
NextIndex := AIndex;
AWidth := 0;
end;
finally
Picture.Free();
end;
end;
// Image suivante
if ALeft + AWidth < PaintBoxScrolling.Width then
begin
if NextIndex >= FFileNames.Count then
NextIndex := 0;
DrawImage(NextIndex, ALeft + AWidth, Dummy);
if AWidth = 0 then
AWidth := Dummy;
end;
end;
end;
var
Picture: TPicture;
Bitmap: TBitmap;
DrawWidth: Integer;
begin
if Assigned(FFileNames) then
begin
if FImageIndex >= FFileNames.Count then
begin
FImageIndex := 0;
FImageLeft := 0;
end;
DrawWidth := 0;
DrawImage(FImageIndex, FImageLeft, DrawWidth);
Dec(FImageLeft, TrackBarScrollingStep.Position);
if (DrawWidth > 0) and (-FImageLeft >= DrawWidth) then
begin
Inc(FImageIndex);
FImageLeft := 0;
end;
end;
end;
procedure TSLTImageScrollingForm.TrackBarTimerIntervalChange(Sender: TObject);
begin
TimerScrolling.Enabled := False;
TimerScrolling.Interval := TrackBarTimerInterval.Position;
TimerScrolling.Enabled := True;
end;
end. |
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