Replace installation types Dropdown list by radio

问题:

I recently added different installation types (Install, Update, Repair) to my InnoSetup. It all workes pretty fine.

[Types]
Name: Install; Description: "Install OLP"; 
Name: Update; Description: "Update an existing version of OLP"; 
Name: Repair; Description: "Repair OLP"; 

The only thing I do not like so much is the dropdown list, that appears when installation runs, to select one of the installation types.

Is there a way to replace the dropdown list by a radio group?

Thanks

回答1:

You can use radio buttons (since there's no radio group component available in Inno Setup):

[Code]
procedure OnTypeChange(Sender: TObject);
begin
  { set the item index in hidden TypesCombo }
  WizardForm.TypesCombo.ItemIndex := TNewRadioButton(Sender).Tag;
  { notify TypesCombo about the selection change }
  WizardForm.TypesCombo.OnChange(nil);
end;

procedure InitializeWizard;
var
  I: Integer;
  RadioButton: TNewRadioButton;
begin
  for I := 0 to WizardForm.TypesCombo.Items.Count - 1 do
  begin
    { create radio button and set the basic properties }
    RadioButton := TNewRadioButton.Create(WizardForm);
    RadioButton.Parent := WizardForm.SelectComponentsPage;
    RadioButton.Left := WizardForm.TypesCombo.Left;
    RadioButton.Top := WizardForm.TypesCombo.Top + I * RadioButton.Height;
    RadioButton.Width := WizardForm.TypesCombo.Width;
    { check just the first item }
    RadioButton.Checked := I = 0;
    RadioButton.Caption := WizardForm.TypesCombo.Items[I];
    { the Tag property substitutes the index property }
    RadioButton.Tag := I;
    RadioButton.TabOrder := I;     
    RadioButton.OnClick := @OnTypeChange;
  end;
  { hide the TypesCombo combo box }
  WizardForm.TypesCombo.Visible := False;

  { if you're not using the "iscustom" flag in any type entry, you can remove }
  { the following lines, because they resize and reposition the check list box }
  { for component selection, which is hidden, if you don't use "iscustom" flag }
  I := WizardForm.ComponentsList.Top - 
    (RadioButton.Top + RadioButton.Height + 8);
  WizardForm.ComponentsList.Top := RadioButton.Top + RadioButton.Height + 8;
  WizardForm.ComponentsList.Height := WizardForm.ComponentsList.Height + I;
end;

And the result (includes the iscustom component list):

Or you can use e.g. check list box, which is able to contain radio buttons in Inno Setup:

[Code]
procedure OnTypeChange(Sender: TObject);
begin
  { set the item index in hidden TypesCombo }
  WizardForm.TypesCombo.ItemIndex := TNewCheckListBox(Sender).ItemIndex;
  { notify TypesCombo about the selection change }
  WizardForm.TypesCombo.OnChange(nil);
end;

procedure InitializeWizard;
var
  I: Integer;
  CheckListBox: TNewCheckListBox;
begin
  { create the TNewCheckListBox object and set the basic properties }
  CheckListBox := TNewCheckListBox.Create(WizardForm);
  CheckListBox.Parent := WizardForm.SelectComponentsPage;
  CheckListBox.Left := WizardForm.TypesCombo.Left;
  CheckListBox.Top := WizardForm.TypesCombo.Top;
  CheckListBox.Width := WizardForm.TypesCombo.Width;
  CheckListBox.Height := CheckListBox.MinItemHeight * 
    WizardForm.TypesCombo.Items.Count + 4;
  CheckListBox.TabOrder := 0;
  { assign the selection change event }
  CheckListBox.OnClickCheck := @OnTypeChange;
  { add radio buttons from all TypesCombo items, select the first item }
  for I := 0 to WizardForm.TypesCombo.Items.Count - 1 do
    CheckListBox.AddRadioButton(WizardForm.TypesCombo.Items[I], 
      '', 0, I = 0, True, nil);
  { hide the TypesCombo combo box }
  WizardForm.TypesCombo.Visible := False;

  { if you're not using the "iscustom" flag in any type entry, you can remove }
  { the following lines, because they resize and reposition the check list box }
  { for component selection, which is hidden, if you don't use "iscustom" flag }
  I := WizardForm.ComponentsList.Top - 
    (CheckListBox.Top + CheckListBox.Height + 8);
  WizardForm.ComponentsList.Top := CheckListBox.Top + 
    CheckListBox.Height + 8;
  WizardForm.ComponentsList.Height := WizardForm.ComponentsList.Height + I;
end;

And the result (includes the iscustom component list):

回答2:

A tidy solution for this would be to use CreateInputOptionPage to create a separate page with radiobuttons prior to the component selection page. (There's an example for this in the CodeDlg.iss script.)

An even tidier option is to not ask at all, since it's entirely unnecessary. You can automatically detect the version that's already installed -- if it's not installed, it's an Install, if it's installed but older, it's an Upgrade, if it's installed and the same version, then it's a Repair, and finally if it's installed but newer then it's a Downgrade -- which you may want to either disallow (safer) or permit but display a warning (more convenient, if it's likely that people might want to downgrade).