跳过基于 Inno Setup 中可选组件的自定义页面

Question

在之前的问题中，我询问了如何拥有三个可选组件，用户还可以分别指定每个组件的位置（例如，一个代码部分和两个 HTML Web 应用程序）。 @Miral 给了我一个很好的答案，我现在已经实现了：
three components in three user defined locations

我还有一个小的审美问题。我总是在向导中创建并询问用户CreateInputDirPage。问题出现在wpSelectComponents 之后。

问题：如果未选择组件，我如何跳过页面。也就是说，如何跳过我的自定义页面？

我感觉它与ShouldSkipPage() 有关。但我不知道我的自定义页面的 PageID 是什么，以及如何测试以查看选择了哪些组件。

function ShouldSkipPage(PageID: Integer): Boolean;

向导调用此事件函数来确定是否应该显示特定页面（由 PageID 指定）。如果返回True，则页面将被跳过；如果返回 False，可能会显示页面。

我的脚本附在下面：

[Components]
Name: "Watson"; Description: "Watson Component"; Types: onlywatson full
Name: "Toby"; Description: "Toby Component"; Types: onlytoby full
Name: "Sherlock"; Description: "Sherlock Component"; Types: onlysherlock full

[Code]
var 
    TobyDirPage: TInputDirWizardPage;
    SherlockDirPage: TInputDirWizardPage;

procedure InitializeWizard;
begin
  TobyDirPage := CreateInputDirPage(wpSelectComponents,
    'Select Location for Toby Web Pages', 'Where should we store the sample Toby application files?',
    'The sample Toby stand-alone map application will be saved in the following folder.'#13#10#13#10 +
    'To continue, click Next. If you would like to select a different folder, click Browse.',
    False, 'New Folder');
  { Add item (with an empty caption) }
  TobyDirPage.Add('');
  { Set initial value (optional) }
  TobyDirPage.Values[0] := ExpandConstant('c:\wwwroot\Toby');
  
  SherlockDirPage := CreateInputDirPage(wpSelectComponents,
    'Select Location for Sherlock Web Pages', 'Where should we store the Sherlock Catalog Search Tool?',
    'Sherlock.html and it'#39 + 's associated files will be saved in the following folder.'#13#10#13#10 +
    'To continue, click Next. If you would like to select a different folder, click Browse.',
    False, 'New Folder');
  { Add item (with an empty caption) }
  SherlockDirPage.Add('');
  { Set initial value (optional) }
  SherlockDirPage.Values[0] := ExpandConstant('c:\wwwroot\Sherlock');
end;

function GetTobyDir(Param: String): String;
begin
  { Return the selected TobyDir }
  Result := TobyDirPage.Values[0];
end;

function GetSherlockDir(Param: String): String;
begin
  { Return the selected TobyDir }
  Result := SherlockDirPage.Values[0];
end;

Answer 1

正如您的正确预感，您需要使用ShouldSkipPage 事件处理程序来有条件地跳过页面。要检查是否选择了某个组件，请使用 IsComponentSelected 函数，最后，要获取自定义页面的 ID，您需要存储其 ID。将所有内容放在一起可能会为您提供以下示例脚本：

[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;

Answer 2

我的看法是使用 TWizardPageShouldSkipEvent，我只制作了一个案例和点脚本：

[Code]
var 
    TobyDirPage: TInputDirWizardPage;

function SkipEvent (Sender: TWizardPage): Boolean;
begin
    Result := not IsComponentSelected('Toby');
end; 

procedure InitializeWizard;
begin
    TobyDirPage := CreateInputDirPage(wpSelectComponents, yadda yadda yadda
    TobyDirPage.OnShouldSkipPage := @SkipEvent;
end;

现在，OnShouldSkipPage 在按下 wpSelectComponents 上的 Next 之后以及在绘制 TobyDirPage 之前立即触发，由于您可以将该事件附加到页面本身，因此您无需摆弄 PageID。