src/Dialog.hpp

#pragma once

#include "window.hpp"

/// <summary>
/// Generic dialog class
/// </summary>
class Dialog : public Window
{
public:
    typedef INT_PTR( Dialog::*fnDlgProc )(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);

    typedef std::map<UINT, fnDlgProc> mapMsgProc;
    typedef std::map<WORD, fnDlgProc> mapCtrlProc;

public:
    Dialog( int dialogID )
        : _dialogID( dialogID )
    { 
        _messages[WM_INITDIALOG] = &Dialog::OnInit;
        _messages[WM_COMMAND]    = &Dialog::OnCommand;
        _messages[WM_CLOSE]      = &Dialog::OnClose;
    }

    /// <summary>
    /// Run dialog as modal window
    /// </summary>
    /// <param name="parent">Parent window.</param>
    /// <returns>TRUE on success, FALSE otherwise</returns>
    virtual INT_PTR RunModal( HWND parent = NULL )
    {
        // Stupid std::function and std::bind don't support __stdcall
        // Had to do this idiotic workaround
        Win32Thunk<DLGPROC, Dialog> dlgProc( &Dialog::DlgProc, this );
        return DialogBoxW( NULL, MAKEINTRESOURCEW( _dialogID ), parent, dlgProc.GetThunk() );
    }

    /// <summary>
    /// Run dialog as modeless window
    /// </summary>
    /// <param name="parent">Parent window</param>
    /// <param name="accelID">Accelerator ID to use</param>
    /// <returns>TRUE on success, FALSE otherwise</returns>
    virtual INT_PTR RunModeless( HWND parent = NULL, int accelID = 0 )
    {
        MSG msg = { 0 };
        BOOL bRet = FALSE;
        HACCEL hAccel = LoadAcceleratorsW( NULL, MAKEINTRESOURCEW( accelID ) );
        _modeless = true;

        Win32Thunk<DLGPROC, Dialog> dlgProc( &Dialog::DlgProc, this );
        _hwnd = CreateDialogW( NULL, MAKEINTRESOURCE( _dialogID ), parent, dlgProc.GetThunk() );
        ShowWindow( _hwnd, SW_SHOW );

        while (IsWindow( _hwnd ) && GetMessageW( &msg, NULL, 0, 0 ) > 0)
        {
            if (TranslateAccelerator( _hwnd, hAccel, &msg ))
                continue;

            if (!IsDialogMessage( _hwnd, &msg ))
            {
                TranslateMessage( &msg );
                DispatchMessage( &msg );
            } 
        }

        return TRUE;
    }

protected:

    /// <summary>
    /// Close dialog properly
    /// </summary>
    /// <returns>status</returns>
    INT_PTR CloseDialog()
    {
        if (_modeless)
        {
            DestroyWindow( _hwnd );
            _hwnd = NULL;
        }
        else
            EndDialog( _hwnd, 0 );

        return TRUE;
    }

    /// <summary>
    /// Dialog message proc
    /// </summary>
    INT_PTR DlgProc( HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam )
    {
        if (_messages.count( message ))
            return (this->*_messages[message])(hDlg, message, wParam, lParam);

        return FALSE;
    }

    /// <summary>
    /// WM_INITDIALOG handler
    /// </summary>
    virtual INT_PTR OnInit( HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam )
    {
        _hwnd = hDlg;
        return TRUE;
    }

    /// <summary>
    /// WM_COMMAND handler
    /// </summary>
    virtual INT_PTR OnCommand( HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam )
    {
        if (_events.count( LOWORD( wParam ) ))
            return (this->*_events[LOWORD( wParam )])(hDlg, message, wParam, lParam);

        if (_events.count( HIWORD( wParam ) ))
            return (this->*_events[HIWORD( wParam )])(hDlg, message, wParam, lParam);

        return FALSE;
    }

    /// <summary>
    /// WM_CLOSE handler
    /// </summary>
    virtual INT_PTR OnClose( HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam )
    {
        return CloseDialog();
    }

protected:
    mapMsgProc _messages;       // Message handlers
    mapCtrlProc _events;        // Event handlers
    int _dialogID;              // Dialog resource ID
    bool _modeless = false;     // Modeless dialog
};