wxWidgets/src/msw/dialog.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        dialog.cpp
// Purpose:     wxDialog class
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "dialog.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/dialog.h"
#include "wx/utils.h"
#include "wx/frame.h"
#include "wx/app.h"
#include "wx/settings.h"
#include "wx/intl.h"
#include "wx/log.h"
#endif

#include "wx/msw/private.h"
#include "wx/log.h"

#if wxUSE_COMMON_DIALOGS
#include <commdlg.h>
#endif

#define wxDIALOG_DEFAULT_X 300
#define wxDIALOG_DEFAULT_Y 300

// Lists to keep track of windows, so we can disable/enable them
// for modal dialogs
wxWindowList wxModalDialogs;
wxWindowList wxModelessWindows;  // Frames and modeless dialogs
extern wxList WXDLLEXPORT wxPendingDelete;

#if !USE_SHARED_LIBRARY
    IMPLEMENT_DYNAMIC_CLASS(wxDialog, wxPanel)

    BEGIN_EVENT_TABLE(wxDialog, wxPanel)
        EVT_SIZE(wxDialog::OnSize)
        EVT_BUTTON(wxID_OK, wxDialog::OnOK)
        EVT_BUTTON(wxID_APPLY, wxDialog::OnApply)
        EVT_BUTTON(wxID_CANCEL, wxDialog::OnCancel)
        EVT_CHAR_HOOK(wxDialog::OnCharHook)
        EVT_SYS_COLOUR_CHANGED(wxDialog::OnSysColourChanged)
        EVT_CLOSE(wxDialog::OnCloseWindow)
    END_EVENT_TABLE()
#endif

wxDialog::wxDialog()
{
  m_isShown = FALSE;
  m_modalShowing = FALSE;

  SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
}

bool wxDialog::Create(wxWindow *parent, wxWindowID id,
                      const wxString& title,
                      const wxPoint& pos,
                      const wxSize& size,
                      long style,
                      const wxString& name)
{
#if wxUSE_TOOLTIPS
    m_hwndToolTip = 0;
#endif

    SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
    SetName(name);

    if (!parent)
        wxTopLevelWindows.Append(this);

    //  windowFont = wxTheFontList->FindOrCreateFont(11, wxSWISS, wxNORMAL, wxNORMAL);

    if (parent) parent->AddChild(this);

    if ( id == -1 )
        m_windowId = (int)NewControlId();
    else
        m_windowId = id;

    int x = pos.x;
    int y = pos.y;
    int width = size.x;
    int height = size.y;

    if (x < 0) x = wxDIALOG_DEFAULT_X;
    if (y < 0) y = wxDIALOG_DEFAULT_Y;

    m_windowStyle = style;

    m_isShown = FALSE;
    m_modalShowing = FALSE;

    if (width < 0)
        width = 500;
    if (height < 0)
        height = 500;

    // All dialogs should really have this style
    m_windowStyle |= wxTAB_TRAVERSAL;

    WXDWORD extendedStyle = MakeExtendedStyle(m_windowStyle);
    if (m_windowStyle & wxSTAY_ON_TOP)
        extendedStyle |= WS_EX_TOPMOST;

    // Allows creation of dialogs with & without captions under MSWindows,
    // resizeable or not (but a resizeable dialog always has caption -
    // otherwise it would look too strange)
    const wxChar *dlg;
    if ( style & wxRESIZE_BORDER )
        dlg = _T("wxResizeableDialog");
    else if ( style & wxCAPTION )
        dlg = _T("wxCaptionDialog");
    else
        dlg = _T("wxNoCaptionDialog");
    MSWCreate(m_windowId, parent, NULL, this, NULL,
              x, y, width, height,
              0, // style is not used if we have dlg template
              dlg,
              extendedStyle);

    HWND hwnd = (HWND)GetHWND();

    if ( !hwnd )
    {
        wxLogError(_("Failed to create dialog."));

        return FALSE;
    }

    SubclassWin(GetHWND());

    SetWindowText(hwnd, title);
    SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));

    return TRUE;
}

void wxDialog::SetModal(bool flag)
{
  if ( flag )
    m_windowStyle |= wxDIALOG_MODAL ;
  else
    if ( m_windowStyle & wxDIALOG_MODAL )
        m_windowStyle -= wxDIALOG_MODAL ;

  wxModelessWindows.DeleteObject(this);
  if (!flag)
    wxModelessWindows.Append(this);
}

wxDialog::~wxDialog()
{
  m_isBeingDeleted = TRUE;

  wxTopLevelWindows.DeleteObject(this);

  Show(FALSE);

  if (m_modalShowing)
  {
    // For some reason, wxWindows can activate another task altogether
    // when a frame is destroyed after a modal dialog has been invoked.
    // Try to bring the parent to the top.
    // dfgg: I moved this following line from end of function -
    //       must not call if another window is on top!!
    //       This can often happen with Close() and delayed deleting
    if (GetParent() && GetParent()->GetHWND())
      ::BringWindowToTop((HWND) GetParent()->GetHWND());
  }

  m_modalShowing = FALSE;

  if ( (GetWindowStyleFlag() & wxDIALOG_MODAL) != wxDIALOG_MODAL )
    wxModelessWindows.DeleteObject(this);

  // If this is the last top-level window, exit.
  if (wxTheApp && (wxTopLevelWindows.Number() == 0))
  {
    wxTheApp->SetTopWindow(NULL);

    if (wxTheApp->GetExitOnFrameDelete())
    {
       PostQuitMessage(0);
    }
  }
}

// By default, pressing escape cancels the dialog
void wxDialog::OnCharHook(wxKeyEvent& event)
{
  if (GetHWND())
  {
    if (event.m_keyCode == WXK_ESCAPE)
    {
        // Behaviour changed in 2.0: we'll send a Cancel message
        // to the dialog instead of Close.
        wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
        cancelEvent.SetEventObject( this );
        GetEventHandler()->ProcessEvent(cancelEvent);

        return;
    }
  }
  // We didn't process this event.
  event.Skip();
}

void wxDialog::OnPaint(wxPaintEvent& event)
{
  // No: if you call the default procedure, it makes
  // the following painting code not work.
//  wxWindow::OnPaint(event);
}

void wxDialog::Fit()
{
  wxWindow::Fit();
}

void wxDialog::Iconize(bool WXUNUSED(iconize))
{
  // Windows dialog boxes can't be iconized
}

bool wxDialog::IsIconized() const
{
  return FALSE;
}

void wxDialog::DoSetClientSize(int width, int height)
{
  HWND hWnd = (HWND) GetHWND();
  RECT rect;
  ::GetClientRect(hWnd, &rect);

  RECT rect2;
  GetWindowRect(hWnd, &rect2);

  // Find the difference between the entire window (title bar and all)
  // and the client area; add this to the new client size to move the
  // window
  int actual_width = rect2.right - rect2.left - rect.right + width;
  int actual_height = rect2.bottom - rect2.top - rect.bottom + height;

  MoveWindow(hWnd, rect2.left, rect2.top, actual_width, actual_height, TRUE);

  wxSizeEvent event(wxSize(actual_width, actual_height), m_windowId);
  event.SetEventObject( this );
  GetEventHandler()->ProcessEvent(event);
}

void wxDialog::GetPosition(int *x, int *y) const
{
  HWND hWnd = (HWND) GetHWND();
  RECT rect;
  GetWindowRect(hWnd, &rect);

  *x = rect.left;
  *y = rect.top;
}

bool wxDialog::IsShown() const
{
  return m_isShown;
}

bool wxDialog::Show(bool show)
{
  m_isShown = show;

  if (show)
    InitDialog();

  bool modal =  ((GetWindowStyleFlag() & wxDIALOG_MODAL) == wxDIALOG_MODAL) ;

#if WXGARBAGE_COLLECTION_ON /* MATTHEW: GC */
  if (!modal) {
    if (show) {
      if (!wxModelessWindows.Find(this))
        wxModelessWindows.Append(this);
    } else
      wxModelessWindows.DeleteObject(this);
  }
  if (show) {
    if (!wxTopLevelWindows.Find(this))
      wxTopLevelWindows.Append(this);
  } else
    wxTopLevelWindows.DeleteObject(this);
#endif

  if (modal)
  {
    if (show)
    {
      // find the top level window which had focus before - we will restore
      // focus to it later
      m_hwndOldFocus = 0;
      for ( HWND hwnd = ::GetFocus(); hwnd; hwnd = ::GetParent(hwnd) )
      {
        m_hwndOldFocus = (WXHWND)hwnd;
      }

      if (m_modalShowing)
      {
        BringWindowToTop((HWND) GetHWND());
        return TRUE;
      }

      m_modalShowing = TRUE;
      wxNode *node = wxModalDialogs.First();
      while (node)
      {
        wxDialog *box = (wxDialog *)node->Data();
        if (box != this)
          ::EnableWindow((HWND) box->GetHWND(), FALSE);
        node = node->Next();
      }

      // if we don't do it, some window might be deleted while we have pointers
      // to them in our disabledWindows list and the program will crash when it
      // will try to reenable them after the modal dialog end
      wxTheApp->DeletePendingObjects();
      wxList disabledWindows;

      node = wxModelessWindows.First();
      while (node)
      {
        wxWindow *win = (wxWindow *)node->Data();
        if (::IsWindowEnabled((HWND) win->GetHWND()))
        {
          ::EnableWindow((HWND) win->GetHWND(), FALSE);
          disabledWindows.Append(win);
        }
        node = node->Next();
      }

      ShowWindow((HWND) GetHWND(), SW_SHOW);
      EnableWindow((HWND) GetHWND(), TRUE);
      BringWindowToTop((HWND) GetHWND());

      if ( !wxModalDialogs.Find(this) )
        wxModalDialogs.Append(this);

      MSG msg;
      // Must test whether this dialog still exists: we may not process
      // a message before the deletion.
      while (wxModalDialogs.Find(this) && m_modalShowing && GetMessage(&msg, NULL, 0, 0))
      {
        if ( m_acceleratorTable.Ok() &&
             ::TranslateAccelerator((HWND)GetHWND(),
                                     (HACCEL)m_acceleratorTable.GetHACCEL(),
                                     &msg) )
        {
            // Have processed the message
        }
        else if ( !wxTheApp->ProcessMessage((WXMSG *)&msg) )
        {
          TranslateMessage(&msg);
          DispatchMessage(&msg);
        }

        // If we get crashes (as per George Tasker's message) with nested modal dialogs,
        // we should try removing the m_modalShowing test

        if (m_modalShowing && !::PeekMessage(&msg, 0, 0, 0, PM_NOREMOVE))
        // dfgg: NB MUST test m_modalShowing again as the message loop could have triggered
        //       a Show(FALSE) in the mean time!!!
        // Without the test, we might delete the dialog before the end of modal showing.
        {
                while (wxTheApp->ProcessIdle() && m_modalShowing)
                {
                    // Keep going until we decide we've done enough
                }
         }
      }
      // dfgg: now must specifically re-enable all other app windows that we disabled earlier
      node=disabledWindows.First();
      while(node) {
        wxWindow* win = (wxWindow*) node->Data();
        if (wxModalDialogs.Find(win) || wxModelessWindows.Find(win))
        {
          HWND hWnd = (HWND) win->GetHWND();
          if (::IsWindow(hWnd))
            ::EnableWindow(hWnd,TRUE);
        }
        node=node->Next();
      }
    }
    else // !show
    {
      ::SetFocus((HWND)m_hwndOldFocus);

      wxModalDialogs.DeleteObject(this);

      wxNode *last = wxModalDialogs.Last();

      // If there's still a modal dialog active, we
      // enable it, else we enable all modeless windows
      if (last)
      {
          // VZ: I don't understand what this is supposed to do, so I'll leave
          //     it out for now and look for horrible consequences
        wxDialog *box = (wxDialog *)last->Data();
        HWND hwnd = (HWND) box->GetHWND();
#if 0
        if (box->IsUserEnabled())
#endif // 0
          EnableWindow(hwnd, TRUE);
        BringWindowToTop(hwnd);
      }
      else
      {
        wxNode *node = wxModelessWindows.First();
        while (node)
        {
          wxWindow *win = (wxWindow *)node->Data();
          HWND hwnd = (HWND) win->GetHWND();
          // Only enable again if not user-disabled.
#if 0
          if (win->IsUserEnabled())
#endif // 0
            EnableWindow(hwnd, TRUE);
          node = node->Next();
        }
      }
      // Try to highlight the correct window (the parent)
      HWND hWndParent = 0;
      if (GetParent())
      {
        hWndParent = (HWND) GetParent()->GetHWND();
        if (hWndParent)
          ::BringWindowToTop(hWndParent);
      }
      ShowWindow((HWND) GetHWND(), SW_HIDE);
      m_modalShowing = FALSE;
    }
  }
  else // !modal
  {
    if (show)
    {
      ShowWindow((HWND) GetHWND(), SW_SHOW);
      BringWindowToTop((HWND) GetHWND());
    }
    else
    {
      // Try to highlight the correct window (the parent)
      HWND hWndParent = 0;
      if (GetParent())
      {
        hWndParent = (HWND) GetParent()->GetHWND();
        if (hWndParent)
          ::BringWindowToTop(hWndParent);
      }
      ShowWindow((HWND) GetHWND(), SW_HIDE);
    }
  }
  return TRUE;
}

void wxDialog::SetTitle(const wxString& title)
{
  SetWindowText((HWND) GetHWND(), title.c_str());
}

wxString wxDialog::GetTitle() const
{
  GetWindowText((HWND) GetHWND(), wxBuffer, 1000);
  return wxString(wxBuffer);
}

void wxDialog::Centre(int direction)
{
  int x_offset,y_offset ;
  int display_width, display_height;
  int  width, height, x, y;
  wxWindow *parent = GetParent();
  if ((direction & wxCENTER_FRAME) && parent)
  {
      parent->GetPosition(&x_offset,&y_offset) ;
      parent->GetSize(&display_width,&display_height) ;
  }
  else
  {
    wxDisplaySize(&display_width, &display_height);
    x_offset = 0 ;
    y_offset = 0 ;
  }

  GetSize(&width, &height);
  GetPosition(&x, &y);

  if (direction & wxHORIZONTAL)
    x = (int)((display_width - width)/2);
  if (direction & wxVERTICAL)
    y = (int)((display_height - height)/2);

  SetSize(x+x_offset, y+y_offset, width, height);
}

// Replacement for Show(TRUE) for modal dialogs - returns return code
int wxDialog::ShowModal()
{
  m_windowStyle |= wxDIALOG_MODAL;
  Show(TRUE);
  return GetReturnCode();
}

void wxDialog::EndModal(int retCode)
{
  SetReturnCode(retCode);
  Show(FALSE);
}

// Define for each class of dialog and control
WXHBRUSH wxDialog::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
      WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
{
#if wxUSE_CTL3D
  HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
  return (WXHBRUSH) hbrush;
#else
  return 0;
#endif
}

// Standard buttons
void wxDialog::OnOK(wxCommandEvent& event)
{
  if ( Validate() && TransferDataFromWindow() )
  {
        if ( IsModal() )
            EndModal(wxID_OK);
        else
        {
            SetReturnCode(wxID_OK);
            this->Show(FALSE);
        }
  }
}

void wxDialog::OnApply(wxCommandEvent& event)
{
  if (Validate())
    TransferDataFromWindow();
  // TODO probably need to disable the Apply button until things change again
}

void wxDialog::OnCancel(wxCommandEvent& event)
{
    if ( IsModal() )
        EndModal(wxID_CANCEL);
    else
    {
        SetReturnCode(wxID_CANCEL);
        this->Show(FALSE);
    }
}

void wxDialog::OnCloseWindow(wxCloseEvent& event)
{
    // We'll send a Cancel message by default,
    // which may close the dialog.
    // Check for looping if the Cancel event handler calls Close().

    // Note that if a cancel button and handler aren't present in the dialog,
    // nothing will happen when you close the dialog via the window manager, or
    // via Close().
    // We wouldn't want to destroy the dialog by default, since the dialog may have been
    // created on the stack.
    // However, this does mean that calling dialog->Close() won't delete the dialog
    // unless the handler for wxID_CANCEL does so. So use Destroy() if you want to be
    // sure to destroy the dialog.
    // The default OnCancel (above) simply ends a modal dialog, and hides a modeless dialog.

    static wxList closing;

    if ( closing.Member(this) )
        return;

    closing.Append(this);

    wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
    cancelEvent.SetEventObject( this );
    GetEventHandler()->ProcessEvent(cancelEvent); // This may close the dialog

    closing.DeleteObject(this);
}

// Destroy the window (delayed, if a managed window)
bool wxDialog::Destroy()
{
  if (!wxPendingDelete.Member(this))
    wxPendingDelete.Append(this);
  return TRUE;
}

void wxDialog::OnSize(wxSizeEvent& WXUNUSED(event))
{
  // if we're using constraints - do use them
  #if wxUSE_CONSTRAINTS
    if ( GetAutoLayout() )
    {
      Layout();
    }
  #endif
}

void wxDialog::OnSysColourChanged(wxSysColourChangedEvent& event)
{
#if wxUSE_CTL3D
  Ctl3dColorChange();
#else
  SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
  Refresh();
#endif
}

// ---------------------------------------------------------------------------
// dialog window proc
// ---------------------------------------------------------------------------

long wxDialog::MSWWindowProc(WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
{
    long rc = 0;
    bool processed = FALSE;

    switch ( message )
    {
        case WM_CLOSE:
            // if we can't close, tell the system that we processed the
            // message - otherwise it would close us
            processed = !Close();
            break;
    }

    if ( !processed )
        rc = wxWindow::MSWWindowProc(message, wParam, lParam);

    return rc;
}