向Inno设置页面添加上下文菜单

问题描述

如何向Inno Setup的特定页面添加一些上下文菜单？

例如，在安装页面中，如果用户右键单击页面，他可以看到“取消”或“暂停”菜单项，它们可以执行某些操作。

解决方法

Inno Setup没有提供API上下文菜单，甚至不用于处理鼠标单击。因此，您需要实现自定义Windows消息处理程序并处理WM_CONTEXTMENU。

[Code]

const
  GWL_WNDPROC = -4;
  WM_CONTEXTMENU = $007B;
  WM_COMMAND = $0111;

type
  WPARAM = UINT_PTR;
  LPARAM = LongInt;
  LRESULT = LongInt;

const
  MF_BYPOSITION = $0400;
  MF_STRING = $0000;

const
  ID_MUTE = 0;
  ID_STOP = 1;

function CallWindowProc(
  lpPrevWndFunc: LongInt; hWnd: HWND; Msg: UINT; wParam: WPARAM;
  lParam: LPARAM): LRESULT; external '[e-mail] stdcall';  
function SetWindowLong(hWnd: HWND; nIndex: Integer; dwNewLong: LongInt): LongInt;
  external '[e-mail] stdcall';    
function CreatePopupMenu: THandle; external '[e-mail] stdcall';
function InsertMenu(
  hMenu: THandle; uPosition: Cardinal; uFlags: Cardinal; uIDNewItem: Cardinal;
  lpNewItem: string): Boolean;
  external '[e-mail] stdcall';
function TrackPopupMenu(
  hMenu: THandle; uFlags: Cardinal; x: Integer; y: Integer; nReserved: Integer;
  hWnd: THandle; Rect: Integer): Boolean; 
  external '[e-mail] stdcall';
function ClientToScreen(hWnd: HWND; var lpPoint: TPoint): Boolean;
  external '[e-mail] stdcall';
  
var
  OldPageWndProc: LongInt;
  Page: TWizardPage;

function GET_X_LPARAM(dw: DWORD): WORD; // aka LOWORD
begin
  Result := WORD(dw);
end;

function GET_Y_LPARAM(dw: DWORD): WORD; // aka HIWORD
begin
  Result := WORD((dw shr 16) and $FFFF);
end;

function PageWndProc(hwnd: HWND; uMsg: UINT; wParam: WPARAM; lParam: LPARAM): LRESULT;
var
  PopupMenu: THandle;
  X,Y: Integer;
begin
  if uMsg = WM_CONTEXTMENU then
  begin
    X := GET_X_LPARAM(lParam); 
    Y := GET_Y_LPARAM(lParam); 

    PopupMenu := CreatePopupMenu();
    InsertMenu(PopupMenu,-1,MF_BYPOSITION or MF_STRING,ID_MUTE,'Mute');
    InsertMenu(PopupMenu,ID_STOP,'Stop');
    TrackPopupMenu(PopupMenu,X,Y,Page.Surface.Handle,0);
  end
    else
  if uMsg = WM_COMMAND then
  begin
    if wParam = ID_MUTE then
    begin
      MsgBox('Muting',mbInformation,MB_OK);
      Result := 0;
    end
      else
    if wParam = ID_STOP then
    begin
      MsgBox('Stopping',MB_OK);
      Result := 0;
    end;
  end
    else
  begin
    Result := CallWindowProc(OldPageWndProc,hwnd,uMsg,wParam,lParam);
  end;
end;

procedure InitializeWizard();
begin
  Page := CreateCustomPage(wpWelcome,'Page with context menu','');

  OldPageWndProc :=
    SetWindowLong(Page.Surface.Handle,GWL_WNDPROC,CreateCallback(@PageWndProc));
end;

procedure DeinitializeSetup;
begin
  SetWindowLong(Page.Surface.Handle,OldPageWndProc);
end;

GWL_WNDPROC代码基于Inno Setup - How to edit the "About Setup" dialog text box 。

如果要添加图标，请参见Adding an icon image to context menu in Inno Setup 。

对于CreateCallback function，您需要Inno Setup6。如果使用Inno Setup 5，则可以使用InnoTools InnoCallback库中的WrapCallback函数。