如果在Inno Setup中未选择任何组件，如何禁用“下一步"按钮? [英] How to disable Next button if no component is selected in Inno Setup?

问题描述

我有三个组件，如果用户选择任何组件，它将进行安装.现在，如果用户未选择任何组件，我想禁用下一步"按钮.

I have three components and if the user select any component it will do installations. Now I want to disable the Next button if the user don't select any components.

我正在尝试if not IsComponentSelected('xxx')，但是它不起作用.谁能帮我吗?

I am trying if not IsComponentSelected('xxx'), but it is not working. Can anyone please help me??

推荐答案

没有简单的方法可以在组件选择更改时更新 Next 按钮状态.

There's no easy way to update the Next button state on component selection change.

一种更简单的方法是单击 Next 按钮时显示一条消息:

A way easier is to display a message when the Next button is clicked:

function NextButtonClick(CurPageID: Integer): Boolean;
begin
  Result := True;

  if CurPageID = wpSelectComponents then
  begin
    if WizardSelectedComponents(False) = '' then
    begin
      MsgBox('No component selected', mbInformation, MB_OK);
      Result := False;
    end;
  end;
end;

---

如果您坚持禁用 Next 按钮，请使用以下命令:

---

If you insist on disabling the Next button, use this:

var
  TypesComboOnChangePrev: TNotifyEvent;

procedure ComponentsListCheckChanges;
begin
  WizardForm.NextButton.Enabled := (WizardSelectedComponents(False) <> '');
end;

procedure ComponentsListClickCheck(Sender: TObject);
begin
  ComponentsListCheckChanges;
end;

procedure TypesComboOnChange(Sender: TObject);
begin
  { First let Inno Setup update the components selection }
  TypesComboOnChangePrev(Sender);
  { And then check for changes }
  ComponentsListCheckChanges;
end;

procedure InitializeWizard();
begin
  WizardForm.ComponentsList.OnClickCheck := @ComponentsListClickCheck;

  { The Inno Setup itself relies on the WizardForm.TypesCombo.OnChange, }
  { so we have to preserve its handler. }
  TypesComboOnChangePrev := WizardForm.TypesCombo.OnChange;
  WizardForm.TypesCombo.OnChange := @TypesComboOnChange;
end;

procedure CurPageChanged(CurPageID: Integer);
begin
  if CurPageID = wpSelectComponents then
  begin
    ComponentsListCheckChanges;
  end;
end;

要了解为什么您需要这么多的代码来完成这么小的任务，请参见 Inno Setup ComponentsList OnClick事件

To understand why you need so much code for such a little task, see Inno Setup ComponentsList OnClick event

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