templates: Add option to extract to Windows installer

Adds back the removed portable installation method, but in a different way that shouldn't be possible to mess up. The original method had to be removed due to an excessive amount of poor video guides on how to install StreamFX, many of which went out of their way to ignore the Installation Guide.

Fixes #542

templates/installer.iss.in

@@ -37,13 +37,18 @@ VersionInfoDescription={#MyAppName} Setup
 ArchitecturesInstallIn64BitMode=x64 arm64 ia64
 ArchitecturesAllowed=@ARCH@
 
+; Installation Modes
+PrivilegesRequired=lowest
+PrivilegesRequiredOverridesAllowed=dialog commandline
+
 ; Wizard Information
 WizardStyle=modern
 WizardResizable=yes
 SetupIconFile="@PROJECT_SOURCE_DIR@/media/icon.ico"
 
 ; Other Information
-UsePreviousAppDir=yes
+UsePreviousAppDir=no
+Uninstallable=not IsPortablePagePortableChoiceChecked()
 DefaultDirName={code:GetDefaultDirectory}
 DefaultGroupName={#MyAppName}
 AllowNoIcons=yes
@@ -67,6 +72,24 @@ Name: "{group}\{cm:ProgramOnTheWeb,{#MyAppName}}"; Filename: "{#MyAppURL}"
 Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
 
 [Code]
+// ------------------------------------------------------------------------------------------------------------------ //
+var
+  oPortablePageStaticChoice: TNewRadioButton;
+  oPortablePagePortableChoice: TNewRadioButton;
+
+function FindRegistryKey(): String; forward;
+function GetDefaultDirectory(Value: String): String; forward;
+function GetUninstallerPath(): String; forward;
+function IsUpgrade(): Boolean; forward;
+function IsPortablePagePortableChoiceChecked(): Boolean; forward;
+function UninstallOldVersion(): Integer; forward;
+procedure OnPortablePagePortableChoiceClick(Sender: TObject); forward;
+procedure OnPortablePageStaticChoiceClick(Sender: TObject); forward;
+function CreatePortablePage: TWizardPage; forward;
+procedure InitializeWizard; forward;
+function ShouldSkipPage(PageID: Integer): Boolean; forward;
+function PrepareToInstall(var NeedsRestart: Boolean): String; forward;
+
 // ------------------------------------------------------------------------------------------------------------------ //
 function FindRegistryKey(): String;
 begin
@@ -133,7 +156,7 @@ end;
 // ------------------------------------------------------------------------------------------------------------------ //
 function IsUpgrade(): Boolean;
 begin
-	Result := (GetUninstallerPath() <> '');
+	Result := (not IsPortablePagePortableChoiceChecked()) and (GetUninstallerPath() <> '');
 end;
 
 // ------------------------------------------------------------------------------------------------------------------ //
@@ -154,6 +177,168 @@ begin
 	end;
 end;
 
+// ------------------------------------------------------------------------------------------------------------------ //
+procedure OnPortablePagePortableChoiceClick(Sender: TObject);
+begin
+  oPortablePageStaticChoice.Checked := False;
+  oPortablePagePortableChoice.Checked := True;
+end;
+
+procedure OnPortablePageStaticChoiceClick(Sender: TObject);
+begin
+  if (not oPortablePageStaticChoice.Enabled) then begin
+    OnPortablePagePortableChoiceClick(Sender);
+  end else begin
+    oPortablePageStaticChoice.Checked := True;
+    oPortablePagePortableChoice.Checked := False;
+  end;
+end;
+
+function IsPortablePagePortableChoiceChecked(): Boolean;
+begin
+	Result := oPortablePagePortableChoice.Checked;
+end;
+
+function CreatePortablePage: TWizardPage;
+var
+  oPage: TWizardPage;
+  oStaticPanel: TPanel;
+  oStaticChoice: TNewRadioButton;
+  oStaticText: TLabel;
+  oStaticWarningText: TLabel;
+  oPortablePanel: TPanel;
+  oPortableChoice: TNewRadioButton;
+  oPortableText: TLabel;
+begin
+  // Build a page that asks a user if they want to use Movable or Static installation.
+  oPage := CreateCustomPage(wpLicense,
+    'Installation Type',
+    'Select how to install StreamFX on your System');
+
+  oStaticPanel := TPanel.Create(oPage);
+  oStaticPanel.Parent := oPage.Surface;
+  oStaticPanel.ParentBackground := False;
+  oStaticPanel.Left := ScaleX(5);
+  oStaticPanel.Top := ScaleY(5);
+  oStaticPanel.Width := oPage.SurfaceWidth - ScaleX(10);
+  oStaticPanel.Height := ScaleY(100);
+  oStaticPanel.Anchors := [akLeft, akTop, akRight];
+  oStaticPanel.Color := clWindow;
+  oStaticPanel.BevelKind := bkTile;
+  oStaticPanel.BevelInner := bvNone;
+  oStaticPanel.BevelOuter := bvRaised;
+  oStaticPanel.BevelWidth := 1;
+  oStaticPanel.OnClick := @OnPortablePageStaticChoiceClick;
+
+  oStaticChoice := TNewRadioButton.Create(oStaticPanel);
+  oPortablePageStaticChoice := oStaticChoice;
+  oStaticChoice.Parent := oStaticPanel;
+  oStaticChoice.ParentBackground := False;
+  oStaticChoice.Left := ScaleX(5);
+  oStaticChoice.Top := ScaleY(5);
+  oStaticChoice.Width := oStaticPanel.Width - ScaleX(10);
+  oStaticChoice.Height := ScaleY(20);
+  oStaticChoice.Anchors := [akLeft, akTop, akRight];
+  oStaticChoice.Caption := 'Static';
+  oStaticChoice.Font.Style := [fsBold];
+  oStaticChoice.OnClick := @OnPortablePageStaticChoiceClick;
+
+  oStaticText := TLabel.Create(oStaticPanel);
+  oStaticText.Parent := oStaticPanel;
+  oStaticText.AutoSize := False;
+  oStaticText.Left := ScaleX(5);
+  oStaticText.Top := ScaleY(5) + oStaticChoice.Top + oStaticChoice.Height;
+  oStaticText.Width := oStaticPanel.Width - ScaleX(10);
+  oStaticText.Height := oStaticPanel.Height - ScaleX(5) - oStaticText.Top;
+  oStaticText.Anchors := [akLeft, akTop, akRight];
+  oStaticText.WordWrap := True
+  oStaticText.Caption := 'Install for use in a static version of OBS Studio, with all necessary features to support it.';
+  oStaticText.OnClick := @OnPortablePageStaticChoiceClick;
+
+  oPortablePanel := TPanel.Create(oPage);
+  oPortablePanel.Parent := oPage.Surface;
+  oPortablePanel.ParentBackground := False;
+  oPortablePanel.Left := ScaleX(5);
+  oPortablePanel.Top := ScaleY(5) + oStaticPanel.Top + oStaticPanel.Height;
+  oPortablePanel.Width := oPage.SurfaceWidth - ScaleX(10);
+  oPortablePanel.Height := ScaleY(100);
+  oPortablePanel.Anchors := [akLeft, akTop, akRight];
+  oPortablePanel.Color := clWindow;
+  oPortablePanel.BevelKind := bkTile;
+  oPortablePanel.BevelInner := bvNone;
+  oPortablePanel.BevelOuter := bvRaised;
+  oPortablePanel.BevelWidth := 1;
+  oPortablePanel.OnClick := @OnPortablePagePortableChoiceClick;
+
+  oPortableChoice := TNewRadioButton.Create(oPortablePanel);
+  oPortablePagePortableChoice := oPortableChoice;
+  oPortableChoice.Parent := oPortablePanel;
+  oPortableChoice.ParentBackground := False;
+  oPortableChoice.Left := ScaleX(5);
+  oPortableChoice.Top := ScaleY(5);
+  oPortableChoice.Width := oPortablePanel.Width - ScaleX(10);
+  oPortableChoice.Height := ScaleY(20);
+  oPortableChoice.Anchors := [akLeft, akTop, akRight];
+  oPortableChoice.Caption := 'Portable';
+  oPortableChoice.Font.Style := [fsBold];
+  oPortableChoice.OnClick := @OnPortablePagePortableChoiceClick;
+
+  oPortableText := TLabel.Create(oPortablePanel);
+  oPortableText.Parent := oPortablePanel;
+  oPortableText.AutoSize := False;
+  oPortableText.Left := ScaleX(5);
+  oPortableText.Top := ScaleY(5) + oPortableChoice.Top + oPortableChoice.Height;
+  oPortableText.Width := oPortablePanel.Width - ScaleX(10);
+  oPortableText.Height := oPortablePanel.Height - ScaleX(5) - oPortableText.Top;
+  oPortableText.Anchors := [akLeft, akTop, akRight];
+  oPortableText.WordWrap := True
+  oPortableText.Caption := 'Install for use in portable or multi-environment scenarios, which require StreamFX to not be tied to the System itself. The uninstaller, automatic updates and other system-dependent features will be unavailable.';
+  oPortableText.OnClick := @OnPortablePagePortableChoiceClick;
+
+  if (not IsAdmin()) then begin
+    oStaticWarningText := TLabel.Create(oStaticPanel);
+    oStaticWarningText.Parent := oStaticPanel;
+    oStaticWarningText.AutoSize := False;
+    oStaticWarningText.Left := ScaleX(5);
+    oStaticWarningText.Top := oPortablePanel.Height - ScaleY(5) - ScaleY(15);
+    oStaticWarningText.Width := oPortablePanel.Width - ScaleX(10);
+    oStaticWarningText.Height := ScaleY(15);
+    oStaticWarningText.Anchors := [akLeft, akBottom, akRight];
+    oStaticWarningText.WordWrap := True
+    oStaticWarningText.Font.Color := clRed;
+    oStaticWarningText.Font.Style := [fsBold];
+    oStaticWarningText.Caption := 'Please launch the Installer as Administrator for static installations.';
+
+    oStaticPanel.Enabled := False;
+    oStaticChoice.Enabled := False;
+    oStaticText.Enabled := False;
+
+    oStaticChoice.Checked := False;
+    oPortableChoice.Checked := True;
+  end else begin
+    oStaticChoice.Checked := True;
+    oPortableChoice.Checked := False;
+  end;
+
+  Result := oPage;
+end;
+
+procedure InitializeWizard;
+var
+  oPortablePage: TWizardPage;
+begin
+  oPortablePage := CreatePortablePage();
+end;
+
+// ------------------------------------------------------------------------------------------------------------------ //
+function ShouldSkipPage(PageID: Integer): Boolean;
+begin
+	Result := False;
+	if ((not IsPortablePagePortableChoiceChecked()) and (PageID = wpSelectDir)) then begin
+		Result := True;
+	end
+end;
+
 // ------------------------------------------------------------------------------------------------------------------ //
 function PrepareToInstall(var NeedsRestart: Boolean): String;
 var