Disable controls based on components selection in Inno Setup

Question

I\'d like to disable controls on my custom page (VST2DirPage) based on selected components. I have tried the condition:

Answer 1

InitializeWizard event function happens even before the installer is shown. At that point, you do not know yet, what components a user will select.

You have to update a controls' state only when you know what components are selected:

• Either when leaving the "Select Components" page.
• Or when entering your custom page.

This shows the later approach (implemented using CurPageChanged event function):

procedure CurPageChanged(CurPageID: Integer);
begin
  if CurPageID = VST2DirPage.ID then
  begin
    VST2DirPage.Buttons[0].Enabled := not WizardIsComponentSelected('VST64');
    VST2DirPage.PromptLabels[0].Enabled := VST2DirPage.Buttons[0].Enabled;
    VST2DirPage.Edits[0].Enabled := VST2DirPage.Buttons[0].Enabled;
  end;
end;

Note that the above code not only disables the controls, when the component is selected. It also re-enables them, if user returns back to "Select Components" page and unselects the component.

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See also a similar question:
Inno Setup - Change a task description label's color and have a line break.