Skipping custom pages based on optional components in Inno Setup

Question

In a prior question I asked how to have three optional components, where the user could also specify the locations for each component separately (e.g. a code part and two HT

Answer 1

As you correctly forefelt, you need to use the ShouldSkipPage event handler to conditionally skip the page. To check if a certain component is selected use the IsComponentSelected function and finally, to get ID of your custom page you need to store its ID. Putting all together might give you the following example script:

[Setup]
AppName=My Program
AppVersion=1.5
DefaultDirName={pf}\My Program
OutputDir=userdocs:Inno Setup Examples Output

[Components]
Name: "help"; Description: "Help File";

[Code]
var
  CustomPageID: Integer;

procedure InitializeWizard;
var
  CustomPage: TInputDirWizardPage;
begin
  CustomPage := CreateInputDirPage(wpSelectComponents, 'Caption', 
    'Description', 'SubCaption', False, 'NewFolderName');
  CustomPage.Add('Input');
  { store your custom page ID to further use in the ShouldSkipPage event }
  CustomPageID := CustomPage.ID;
end;

function ShouldSkipPage(PageID: Integer): Boolean;
begin
  { initialize result to not skip any page (not necessary, but safer) }
  Result := False;
  { if the page that is asked to be skipped is your custom page, then... }
  if PageID = CustomPageID then
    { if the component is not selected, skip the page }
    Result := not IsComponentSelected('help');
end;