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Приложение для просмотра изображений JPEG и BMP
unit
mainUnit;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtDlgs, StdCtrls, ComCtrls, ExtCtrls, Buttons, ToolWin, ImgList;
type
TForm1 = class
(TForm) SavePictureDialog1: TSavePictureDialog; OpenPictureDialog1: TOpenPictureDialog; ScrollBox1: TScrollBox; Image1: TImage; ToolBar1: TToolBar; OpenBtn: TToolButton; SaveBtn: TToolButton; Panel2: TPanel; ProgressBar1: TProgressBar; ImageList1: TImageList; procedure
SavePictureDialog1TypeChange(Sender: TObject); procedure
Image1Progress(Sender: TObject; Stage:
TProgressStage;
PercentDone: Byte; RedrawNow: Boolean; const
R: TRect;
const
Msg: string
); procedure
SavePictureDialog1Close(Sender: TObject); procedure
FormCreate(Sender: TObject); procedure
OpenBitBtnClick(Sender: TObject); procedure
SaveBitBtnClick(Sender: TObject); procedure
ToolBar1Resize(Sender: TObject); private
{ Private declarations }
public
{ Public declarations }
end
;
var
Form1: TForm1;
implementation
{$R *.DFM}
uses
jpeg;
const
DeltaH: Integer = 80; var
Quality: TJpegQualityRange;
ProgressiveEnc: Boolean;
procedure
TForm1.FormCreate(Sender: TObject); var
s: string
; begin
s := GraphicFilter(TBitmap) + '|' + GraphicFilter(TJpegImage);
OpenPictureDialog1.Filter := s;
SavePictureDialog1.Filter := s;
end
;
procedure
TForm1.OpenBitBtnClick(Sender: TObject); begin
if
OpenPictureDialog1.Execute then
begin
Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);
SaveBtn.Enabled := True;
end
;
end
;
procedure
TForm1.SaveBitBtnClick(Sender: TObject); var
ji: TJpegImage; begin
with
SavePictureDialog1 do
begin
FilterIndex := 1;
FileName := '';
if
not
Execute then
Exit;
if
Pos('.', FileName) = 0 then
if
(FilterIndex = 1) then
FileName := FileName + '.bmp' else
FileName := FileName + '.jpg';
if
(FilterIndex = 1) then
Image1.Picture.Bitmap.SaveToFile(FileName) else
begin
ji := TJpegImage.Create; ji.CompressionQuality := Quality; ji.ProgressiveEncoding := ProgressiveEnc; ji.OnProgress := Image1Progress; ji.Assign(Image1.Picture.Bitmap); ji.SaveToFile(FileName); ji.Free; end
; end
;
end
;
procedure
TForm1.SavePictureDialog1TypeChange(Sender: TObject); var
ParentHandle: THandle; wRect: TRect; PicPanel, PaintPanel: TPanel; QEdit: TEdit; begin
with
Sender as
TSavePictureDialog do
begin
//родительская панель
PicPanel := (FindComponent('PicturePanel') as
TPanel); if
not
Assigned(PicPanel) then
Exit;
ParentHandle := GetParent(Handle);
//панель-сосед сверху
PaintPanel := (FindComponent('PaintPanel') as
TPanel); PaintPanel.Align := alNone; if
FilterIndex > 1 then
begin
GetWindowRect(ParentHandle, WRect);
SetWindowPos(ParentHandle, 0, 0, 0, WRect.Right -
WRect.Left,
WRect.Bottom - WRect.Top + DeltaH,
SWP_NOMOVE + SWP_NOZORDER);
GetWindowRect(Handle, WRect);
SetWindowPos(handle, 0, 0, 0, WRect.Right -
WRect.Left,
WRect.Bottom - WRect.Top + DeltaH,
SWP_NOMOVE + SWP_NOZORDER);
PicPanel.Height := PicPanel.Height + DeltaH;
if
FindComponent('JLabel') = nil
then
with
TLabel.Create(Sender as
TSavePictureDialog) do
begin
Parent := PicPanel;
Name := 'JLabel';
Caption := 'Quality';
Left := 5;
//Width := PicPanel.Width - 10;
Height := 25;
Top := PaintPanel.Top +
PaintPanel.Height + 5;
end
;
if
FindComponent('JEdit') = nil
then
begin
QEdit := TEdit.Create(Sender as
TSavePictureDialog);
with
QEdit do
begin
Parent := PicPanel;
Name := 'JEdit';
Text := '75';
Left := 50; Width := 50;
Height := 25;
Top := PaintPanel.Top +
PaintPanel.Height + 5;
end
; end
;
if
FindComponent('JUpDown') = nil
then
with
TUpDown.Create(Sender as
TSavePictureDialog) do
begin
Parent := PicPanel; Name := 'JUpDown'; Associate := QEdit; Increment := 5; Min := 1; Max := 100; Position := 75; end
;
if
FindComponent('JCheck') = nil
then
with
TCheckBox.Create(Sender as
TSavePictureDialog) do
begin
Name := 'JCheck';
Caption := 'Progressive
Encoding';
Parent := PicPanel;
Left := 5; Width :=
PicPanel.Width - 10;
Height := 25;
Top := PaintPanel.Top +
PaintPanel.Height + 35;
end
; end
else
SavePictureDialog1Close(Sender); end
;
end
;
procedure
TForm1.Image1Progress(Sender: TObject; Stage: TProgressStage; PercentDone: Byte; RedrawNow: Boolean; const
R: TRect; const
Msg: string
); begin
case
Stage of
psStarting: begin
Progressbar1.Position := 0; Progressbar1.Max := 100; end
; psEnding: begin
Progressbar1.Position := 0; end
; psRunning: begin
Progressbar1.Position := PercentDone; end
; end
;
end
;
procedure
TForm1.SavePictureDialog1Close(Sender: TObject); var
PicPanel: TPanel; ParentHandle: THandle; WRect: TRect; begin
with
Sender as
TSavePictureDialog do
begin
PicPanel := (FindComponent('PicturePanel') as
TPanel); if
not
Assigned(PicPanel) then
Exit; ParentHandle := GetParent(Handle); if
ParentHandle = 0 then
Exit; if
FindComponent('JLabel') <> nil
then
try
FindComponent('JLabel').Free; FindComponent('JEdit').Free; ProgressiveEnc := (FindComponent('JCheck') as
TCheckBox).Checked;
FindComponent('JCheck').Free;
Quality := (FindComponent('JUpDown') as
TUpDown).Position;
FindComponent('JUpDown').Free;
PicPanel.Height := PicPanel.Height - DeltaH;
GetWindowRect(Handle, WRect);
SetWindowPos(Handle, 0, 0, 0, WRect.Right -
WRect.Left,
WRect.Bottom - WRect.Top - DeltaH,
SWP_NOMOVE + SWP_NOZORDER);
GetWindowRect(ParentHandle, WRect);
SetWindowPos(ParentHandle, 0, 0, 0, WRect.Right -
WRect.Left,
WRect.Bottom - WRect.Top - DeltaH,
SWP_NOMOVE + SWP_NOZORDER);
FilterIndex := 1;
except
ShowMessage('Dialog resizing error'); end
; end
;
end
;
procedure
TForm1.ToolBar1Resize(Sender: TObject); begin
Panel2.Width := ToolBar1.Width - Panel2.Left;
end
;
end
.