Inno Setup: Enlarge component page only with preview and description - inno-setup

Question

I need help from you to merge two scripts found here to have preview image on a maximized components windows:
Add image into the components list - component description
Long descriptions on Inno Setup components
Edit: Thanks to Martin Prikryl. With his patience and his help, I successfully merge these two scripts.
Your preview image should have a resolution of 208x165 in .bmp
[Files]
...
Source: "1.bmp"; Flags: dontcopy
Source: "2.bmp"; Flags: dontcopy
Source: "3.bmp"; Flags: dontcopy
Source: "InnoCallback.dll"; Flags: dontcopy
[Code]
var
LastMouse: TPoint;
type
TTimerProc = procedure(H: LongWord; Msg: LongWord; IdEvent: LongWord; Time: LongWord);
function GetCursorPos(var lpPoint: TPoint): BOOL; external 'GetCursorPos#user32.dll stdcall';
function SetTimer(hWnd: longword; nIDEvent, uElapse: LongWord; lpTimerFunc: LongWord): LongWord; external 'SetTimer#user32.dll stdcall';
function ScreenToClient(hWnd: HWND; var lpPoint: TPoint): BOOL; external 'ScreenToClient#user32.dll stdcall';
function ClientToScreen(hWnd: HWND; var lpPoint: TPoint): BOOL; external 'ClientToScreen#user32.dll stdcall';
function ListBox_GetItemRect(const hWnd: HWND; const Msg: Integer; Index: LongInt; var Rect: TRect): LongInt; external 'SendMessageW#user32.dll stdcall';
const
LB_GETITEMRECT = $0198;
LB_GETTOPINDEX = $018E;
function WrapTimerProc(Callback: TTimerProc; ParamCount: Integer): LongWord; external 'wrapcallback#files:InnoCallback.dll stdcall';
function FindControl(Parent: TWinControl; P: TPoint): TControl;
var
Control: TControl;
WinControl: TWinControl;
I: Integer;
P2: TPoint;
begin
for I := 0 to Parent.ControlCount - 1 do
begin
Control := Parent.Controls[I];
if Control.Visible and
(Control.Left <= P.X) and (P.X < Control.Left + Control.Width) and
(Control.Top <= P.Y) and (P.Y < Control.Top + Control.Height) then
begin
if Control is TWinControl then
begin
P2 := P;
ClientToScreen(Parent.Handle, P2);
WinControl := TWinControl(Control);
ScreenToClient(WinControl.Handle, P2);
Result := FindControl(WinControl, P2);
if Result <> nil then Exit;
end;
Result := Control;
Exit;
end;
end;
Result := nil;
end;
function PointInRect(const Rect: TRect; const Point: TPoint): Boolean;
begin
Result := (Point.X >= Rect.Left) and (Point.X <= Rect.Right) and
(Point.Y >= Rect.Top) and (Point.Y <= Rect.Bottom);
end;
function ListBoxItemAtPos(ListBox: TCustomListBox; Pos: TPoint): Integer;
var
Count: Integer;
ItemRect: TRect;
begin
Result := SendMessage(ListBox.Handle, LB_GETTOPINDEX, 0, 0);
Count := ListBox.Items.Count;
while Result < Count do
begin
ListBox_GetItemRect(ListBox.Handle, LB_GETITEMRECT, Result, ItemRect);
if PointInRect(ItemRect, Pos) then Exit;
Inc(Result);
end;
Result := -1;
end;
var
CompLabel: TLabel;
CompImage: TBitmapImage;
LoadingImage: Boolean;
procedure HoverComponentChanged(Index: Integer);
var
Description: string;
Image: string;
ImagePath: string;
begin
case Index of
0: begin Description := 'Component 1'; Image := '1.bmp'; end;
1: begin Description := 'Component 2'; Image := '2.bmp'; end;
2: begin Description := 'Component 3'; Image := '3.bmp'; end;
else
Description := 'Move your mouse over a component to see its description.';
end;
CompLabel.Caption := Description;
if Image <> '' then
begin
// The ExtractTemporaryFile pumps the message queue, prevent recursion
if not LoadingImage then
begin
LoadingImage := True;
try
ImagePath := ExpandConstant('{tmp}\' + Image);
if not FileExists(ImagePath) then
begin
ExtractTemporaryFile(Image);
end;
CompImage.Bitmap.LoadFromFile(ImagePath);
finally
LoadingImage := False;
end;
end;
CompImage.Visible := True;
end
else
begin
CompImage.Visible := False;
end;
end;
procedure HoverTimerProc(H: LongWord; Msg: LongWord; IdEvent: LongWord; Time: LongWord);
var
P: TPoint;
Control: TControl;
Index: Integer;
begin
GetCursorPos(P);
if P <> LastMouse then // just optimization
begin
LastMouse := P;
ScreenToClient(WizardForm.Handle, P);
if (P.X < 0) or (P.Y < 0) or
(P.X > WizardForm.ClientWidth) or (P.Y > WizardForm.ClientHeight) then
begin
Control := nil;
end
else
begin
Control := FindControl(WizardForm, P);
end;
Index := -1;
if Control = WizardForm.ComponentsList then
begin
P := LastMouse;
ScreenToClient(WizardForm.ComponentsList.Handle, P);
Index := ListBoxItemAtPos(WizardForm.ComponentsList, P);
end;
HoverComponentChanged(Index);
end;
end;
type
TPositionStorage = array of Integer;
var
CompPageModified: Boolean;
CompPagePositions: TPositionStorage;
procedure SaveComponentsPage(out Storage: TPositionStorage);
begin
SetArrayLength(Storage, 10);
Storage[0] := WizardForm.Height;
Storage[1] := WizardForm.NextButton.Top;
Storage[2] := WizardForm.BackButton.Top;
Storage[3] := WizardForm.CancelButton.Top;
Storage[4] := WizardForm.ComponentsList.Height;
Storage[5] := WizardForm.OuterNotebook.Height;
Storage[6] := WizardForm.InnerNotebook.Height;
Storage[7] := WizardForm.Bevel.Top;
Storage[8] := WizardForm.BeveledLabel.Top;
Storage[9] := WizardForm.ComponentsDiskSpaceLabel.Top;
end;
procedure LoadComponentsPage(const Storage: TPositionStorage;
HeightOffset: Integer);
begin
if GetArrayLength(Storage) <> 10 then
RaiseException('Invalid storage array length.');
WizardForm.Height := Storage[0] + HeightOffset;
WizardForm.NextButton.Top := Storage[1] + HeightOffset;
WizardForm.BackButton.Top := Storage[2] + HeightOffset;
WizardForm.CancelButton.Top := Storage[3] + HeightOffset;
WizardForm.ComponentsList.Height := Storage[4] + ScaleY(150);
WizardForm.OuterNotebook.Height := Storage[5] + HeightOffset;
WizardForm.InnerNotebook.Height := Storage[6] + HeightOffset;
WizardForm.Bevel.Top := Storage[7] + HeightOffset;
WizardForm.BeveledLabel.Top := Storage[8] + HeightOffset;
WizardForm.ComponentsDiskSpaceLabel.Top := Storage[9] + HeightOffset;
end;
procedure InitializeWizard1();
var
HoverTimerCallback: LongWord;
begin
HoverTimerCallback := WrapTimerProc(#HoverTimerProc, 4);
SetTimer(0, 0, 50, HoverTimerCallback);
CompLabel := TLabel.Create(WizardForm);
CompLabel.Parent := WizardForm.SelectComponentsPage;
CompLabel.Left := WizardForm.ComponentsList.Left;
CompLabel.Width := WizardForm.ComponentsList.Width div 2;
CompLabel.Height := ScaleY(64);
CompLabel.Top := WizardForm.ComponentsList.Top + WizardForm.ComponentsList.Height - CompLabel.Height + ScaleY(150);
CompLabel.AutoSize := false;
CompLabel.WordWrap := True;
CompImage := TBitmapImage.Create(WizardForm);
CompImage.Parent := WizardForm.SelectComponentsPage;
CompImage.Top := CompLabel.Top;
CompImage.Width := CompImage.Width + ScaleX(128);
CompImage.Height := CompLabel.Height + ScaleX(128);
CompImage.Left := WizardForm.ComponentsList.Left + WizardForm.ComponentsList.Width - CompLabel.Width;
WizardForm.ComponentsList.Height := WizardForm.ComponentsList.Height - CompLabel.Height - ScaleY(8);
end;
procedure InitializeWizard2();
begin
CompPageModified := False;
end;
procedure CurPageChanged(CurPageID: Integer);
begin
if CurpageID = wpSelectComponents then
begin
SaveComponentsPage(CompPagePositions);
LoadComponentsPage(CompPagePositions, ScaleY(250));
CompPageModified := True;
end
else
if CompPageModified then
begin
LoadComponentsPage(CompPagePositions, 0);
CompPageModified := False;
end;
end;
procedure InitializeWizard();
begin
InitializeWizard1();
InitializeWizard2();
end;

Answer 1

Just copy both codes and merge the InitializeWizard implementations according to this guide:
Merging event function (InitializeWizard) implementations from different sources.
Though, actually, the InitializeWizard in the Larger “Select Components” page in Inno Setup is noop. You can skip that. And you do not need to merge anything.
The only other change you need to do, is not to enlarge the ComponentsList in the LoadComponentsPage.