unit VTSCompat;
{$IF CompilerVersion >= 25.0}
{$LEGACYIFEND ON}
{$IFEND}
interface
uses
Dialogs, Windows, Controls, Graphics, SysUtils, CommDlg, Classes;
function AddTransparentIconToImageList(ImageList: TImageList; Icon: TIcon; DoGreyscale: boolean=False): integer;
function CompatOpenDialogExecute(OpenDialog: TOpenDialog): boolean;
function CompatSaveDialogExecute(SaveDialog: TSaveDialog): boolean;
function ToGray(PixelColor: Longint): Longint;
implementation
uses
PatchU, ShlObj, ShellAPI;
var
pp: TPatchMethod;
// --- CompatOpenDialogExecute
type
TExtOpenDialogAccessor = class(TOpenDialog);
TExtOpenDialog = class(TOpenDialog)
protected
function TaskModalDialog(DialogFunc: Pointer; var DialogData): Bool; override;
end;
function TExtOpenDialog.TaskModalDialog(DialogFunc: Pointer; var DialogData): Bool;
begin
TOpenFileName(DialogData).Flags :=
TOpenFileName(DialogData).Flags and not OFN_ENABLETEMPLATE;
TOpenFileName(DialogData).Flags :=
TOpenFileName(DialogData).Flags and not OFN_ENABLEHOOK;
if pp.IsPatched then pp.Restore;
result := inherited TaskModalDialog(DialogFunc, DialogData);
end;
function CompatOpenDialogExecute(OpenDialog: TOpenDialog): boolean;
{$IF CompilerVersion < 18.5} // prior to Delphi 2007
var
x: TExtOpenDialog;
MethodPtr, MethodPtr2: function(DialogFunc: Pointer; var DialogData): Bool of object;
begin
MethodPtr := TExtOpenDialogAccessor(OpenDialog).TaskModalDialog;
x := TExtOpenDialog.Create(nil);
try
MethodPtr2 := x.TaskModalDialog;
pp := TPatchMethod.Create(@MethodPtr, @MethodPtr2);
try
result := OpenDialog.Execute;
if pp.IsPatched then pp.Restore;
finally
pp.Free;
end;
finally
x.Free;
end;
{$ELSE}
begin
result := OpenDialog.Execute;
{$IFEND}
end;
// --- CompatSaveDialogExecute
type
TExtSaveDialogAccessor = class(TSaveDialog);
TExtSaveDialog = class(TSaveDialog)
protected
function TaskModalDialog(DialogFunc: Pointer; var DialogData): Bool; override;
end;
function TExtSaveDialog.TaskModalDialog(DialogFunc: Pointer; var DialogData): Bool;
begin
// Remove the two flags which let the File Dialog GUI fall back to the old design.
TOpenFileName(DialogData).Flags :=
TOpenFileName(DialogData).Flags and not OFN_ENABLETEMPLATE;
TOpenFileName(DialogData).Flags :=
TOpenFileName(DialogData).Flags and not OFN_ENABLEHOOK;
// It is important to restore TaskModalDialog, so we don't get a stack
// overflow when calling the inherited method.
if pp.IsPatched then pp.Restore;
result := inherited TaskModalDialog(DialogFunc, DialogData);
end;
function CompatSaveDialogExecute(SaveDialog: TSaveDialog): boolean;
{$IF CompilerVersion < 18.5} // prior to Delphi 2007
var
x: TExtSaveDialog;
MethodPtr, MethodPtr2: function(DialogFunc: Pointer; var DialogData): Bool of object;
begin
MethodPtr := TExtSaveDialogAccessor(SaveDialog).TaskModalDialog;
x := TExtSaveDialog.Create(nil);
try
MethodPtr2 := x.TaskModalDialog;
pp := TPatchMethod.Create(@MethodPtr, @MethodPtr2);
try
result := SaveDialog.Execute;
finally
pp.Free;
end;
finally
x.Free;
end;
{$ELSE}
begin
result := SaveDialog.Execute;
{$IFEND}
end;
// --- AddTransparentIconToImageList
function RealIconSize(H: HIcon): TPoint;
// http://www.delphipages.com/forum/showthread.php?t=183999
var
IconInfo: TIconInfo;
bmpmask: TBitmap;
begin
result := Point(0, 0);
if H <> 0 then
begin
bmpmask := TBitmap.Create;
try
IconInfo.fIcon := true;
try
GetIconInfo(H, IconInfo);
bmpmask.Handle := IconInfo.hbmMask;
bmpmask.Dormant; //lets us free the resource without 'losing' the bitmap
finally
DeleteObject(IconInfo.hbmMask);
DeleteObject(IconInfo.hbmColor)
end;
result := Point(bmpmask.Width, bmpmask.Height);
finally
bmpmask.Free;
end;
end;
end;
function ToGray(PixelColor: Longint): Longint;
var
Red, Green, Blue, Gray: Byte;
begin
Red := PixelColor;
Green := PixelColor shr 8;
Blue := PixelColor shr 16;
Gray := Round(0.299 * Red + 0.587 * Green + 0.114 * Blue);
result := Gray + Gray shl 8 + Gray shl 16;
end;
function AddTransparentIconToImageList(ImageList: TImageList; Icon: TIcon; DoGreyscale: boolean=False): integer;
// http://www.delphipages.com/forum/showthread.php?t=183999
var
buffer, mask: TBitmap;
p: TPoint;
x, y: integer;
begin
// result := ImageList.AddIcon(ico);
// --> In Delphi 6, Icons with half-transparency have a black border (e.g. in ListView)
p := RealIconSize(icon.handle);
buffer := TBitmap.Create;
mask := TBitmap.Create;
try
buffer.PixelFormat := pf24bit;
mask.PixelFormat := pf24bit;
buffer.Width := p.X;
buffer.Height := p.Y;
buffer.Canvas.Draw(0, 0, icon);
buffer.Transparent := true;
buffer.TransparentColor := buffer.Canvas.Pixels[0,0];
if (ImageList.Width <> p.X) or (ImageList.Height <> p.Y) then
begin
ImageList.Width := p.X;
ImageList.Height := p.Y;
end;
// create a mask for the icon.
mask.Assign(buffer);
mask.Canvas.Brush.Color := buffer.Canvas.Pixels[0, buffer.Height -1];
mask.Monochrome := true;
if DoGreyscale then
begin
for x := 0 to buffer.Width - 1 do
begin
for y := 0 to buffer.Height - 1 do
begin
buffer.Canvas.Pixels[x, y] := ToGray(buffer.Canvas.Pixels[x, y]);
end;
end;
end;
result := ImageList.Add(buffer, mask);
finally
mask.Free;
buffer.Free;
end;
end;
end.