combo.c

winNT技术操作系统,国外开放的原代码和LIUX一样

    if (lprEdit->right < lprEdit->left)
        lprEdit->right = lprEdit->left;
        
  TRACE("\ttext\t= (%ld,%ld-%ld,%ld)\n",
	lprEdit->left, lprEdit->top, lprEdit->right, lprEdit->bottom);

  TRACE("\tbutton\t= (%ld,%ld-%ld,%ld)\n",
	lprButton->left, lprButton->top, lprButton->right, lprButton->bottom);

  TRACE("\tlbox\t= (%ld,%ld-%ld,%ld)\n",
	lprLB->left, lprLB->top, lprLB->right, lprLB->bottom );
}

/***********************************************************************
 *           CBGetDroppedControlRect
 */
static void CBGetDroppedControlRect( LPHEADCOMBO lphc, LPRECT lpRect)
{
    /* In windows, CB_GETDROPPEDCONTROLRECT returns the upper left corner
     of the combo box and the lower right corner of the listbox */

    GetWindowRect(lphc->self, lpRect);

    lpRect->right =  lpRect->left + lphc->droppedRect.right - lphc->droppedRect.left;
    lpRect->bottom = lpRect->top + lphc->droppedRect.bottom - lphc->droppedRect.top;

}

/***********************************************************************
 *           COMBO_WindowPosChanging
 */
static LRESULT COMBO_WindowPosChanging(
  HWND        hwnd,
  LPHEADCOMBO lphc,
  WINDOWPOS*  posChanging)
{
  /*
   * We need to override the WM_WINDOWPOSCHANGING method to handle all
   * the non-simple comboboxes. The problem is that those controls are
   * always the same height. We have to make sure they are not resized
   * to another value.
   */
  if ( ( CB_GETTYPE(lphc) != CBS_SIMPLE ) &&
       ((posChanging->flags & SWP_NOSIZE) == 0) )
  {
    int newComboHeight;

    newComboHeight = CBGetTextAreaHeight(hwnd,lphc) +
                      2*COMBO_YBORDERSIZE();

    /*
     * Resizing a combobox has another side effect, it resizes the dropped
     * rectangle as well. However, it does it only if the new height for the
     * combobox is different from the height it should have. In other words,
     * if the application resizing the combobox only had the intention to resize
     * the actual control, for example, to do the layout of a dialog that is
     * resized, the height of the dropdown is not changed.
     */
    if (posChanging->cy != newComboHeight)
    {
	TRACE("posChanging->cy=%d, newComboHeight=%d, oldbot=%ld, oldtop=%ld\n",
	      posChanging->cy, newComboHeight, lphc->droppedRect.bottom,
	      lphc->droppedRect.top);
      lphc->droppedRect.bottom = lphc->droppedRect.top + posChanging->cy - newComboHeight;

      posChanging->cy = newComboHeight;
    }
  }

  return 0;
}

/***********************************************************************
 *           COMBO_Create
 */
static LRESULT COMBO_Create( HWND hwnd, LPHEADCOMBO lphc, HWND hwndParent, LONG style,
                             BOOL unicode )
{
  static const WCHAR clbName[] = {'C','o','m','b','o','L','B','o','x',0};
  static const WCHAR editName[] = {'E','d','i','t',0};

  if( !CB_GETTYPE(lphc) ) lphc->dwStyle |= CBS_SIMPLE;
  if( CB_GETTYPE(lphc) != CBS_DROPDOWNLIST ) lphc->wState |= CBF_EDIT;

  lphc->owner = hwndParent;

  /*
   * The item height and dropped width are not set when the control
   * is created.
   */
  lphc->droppedWidth = lphc->editHeight = 0;

  /*
   * The first time we go through, we want to measure the ownerdraw item
   */
  lphc->wState |= CBF_MEASUREITEM;

  /* M$ IE 3.01 actually creates (and rapidly destroys) an ownerless combobox */

  if( lphc->owner || !(style & WS_VISIBLE) )
  {
      UINT lbeStyle   = 0;
      UINT lbeExStyle = 0;

      /*
       * Initialize the dropped rect to the size of the client area of the
       * control and then, force all the areas of the combobox to be
       * recalculated.
       */
      GetClientRect( hwnd, &lphc->droppedRect );
      CBCalcPlacement(hwnd, lphc, &lphc->textRect, &lphc->buttonRect, &lphc->droppedRect );

      /*
       * Adjust the position of the popup listbox if it's necessary
       */
      if ( CB_GETTYPE(lphc) != CBS_SIMPLE )
      {
	lphc->droppedRect.top   = lphc->textRect.bottom + COMBO_YBORDERSIZE();

	/*
	 * If it's a dropdown, the listbox is offset
	 */
	if( CB_GETTYPE(lphc) == CBS_DROPDOWN )
	  lphc->droppedRect.left += COMBO_EDITBUTTONSPACE();

        if (lphc->droppedRect.bottom < lphc->droppedRect.top)
            lphc->droppedRect.bottom = lphc->droppedRect.top;
        if (lphc->droppedRect.right < lphc->droppedRect.left)
            lphc->droppedRect.right = lphc->droppedRect.left;
        MapWindowPoints( hwnd, 0, (LPPOINT)&lphc->droppedRect, 2 );
      }

      /* create listbox popup */

      lbeStyle = (LBS_NOTIFY | LBS_COMBOBOX | WS_BORDER | WS_CLIPSIBLINGS | WS_CHILD) |
                 (style & (WS_VSCROLL | CBS_OWNERDRAWFIXED | CBS_OWNERDRAWVARIABLE));

      if( lphc->dwStyle & CBS_SORT )
	lbeStyle |= LBS_SORT;
      if( lphc->dwStyle & CBS_HASSTRINGS )
	lbeStyle |= LBS_HASSTRINGS;
      if( lphc->dwStyle & CBS_NOINTEGRALHEIGHT )
	lbeStyle |= LBS_NOINTEGRALHEIGHT;
      if( lphc->dwStyle & CBS_DISABLENOSCROLL )
	lbeStyle |= LBS_DISABLENOSCROLL;

      if( CB_GETTYPE(lphc) == CBS_SIMPLE ) 	/* child listbox */
      {
	lbeStyle |= WS_VISIBLE;

	/*
	 * In win 95 look n feel, the listbox in the simple combobox has
	 * the WS_EXCLIENTEDGE style instead of the WS_BORDER style.
	 */
	lbeStyle   &= ~WS_BORDER;
	lbeExStyle |= WS_EX_CLIENTEDGE;
      }
      else
      {
        lbeExStyle |= (WS_EX_TOPMOST | WS_EX_TOOLWINDOW);
      }

      if (unicode)
          lphc->hWndLBox = CreateWindowExW(lbeExStyle, clbName, NULL, lbeStyle,
                                           lphc->droppedRect.left,
                                           lphc->droppedRect.top,
                                           lphc->droppedRect.right - lphc->droppedRect.left,
                                           lphc->droppedRect.bottom - lphc->droppedRect.top,
                                           hwnd, (HMENU)ID_CB_LISTBOX,
                                           (HINSTANCE)GetWindowLongPtrW( hwnd, GWLP_HINSTANCE ), lphc );
      else
          lphc->hWndLBox = CreateWindowExA(lbeExStyle, "ComboLBox", NULL, lbeStyle,
                                           lphc->droppedRect.left,
                                           lphc->droppedRect.top,
                                           lphc->droppedRect.right - lphc->droppedRect.left,
                                           lphc->droppedRect.bottom - lphc->droppedRect.top,
                                           hwnd, (HMENU)ID_CB_LISTBOX,
                                           (HINSTANCE)GetWindowLongPtrW( hwnd, GWLP_HINSTANCE ), lphc );

      if( lphc->hWndLBox )
      {
	  BOOL	bEdit = TRUE;
	  lbeStyle = WS_CHILD | WS_VISIBLE | ES_NOHIDESEL | ES_LEFT | ES_COMBO;

	  if( lphc->wState & CBF_EDIT )
	  {
	      if( lphc->dwStyle & CBS_OEMCONVERT )
		  lbeStyle |= ES_OEMCONVERT;
	      if( lphc->dwStyle & CBS_AUTOHSCROLL )
		  lbeStyle |= ES_AUTOHSCROLL;
	      if( lphc->dwStyle & CBS_LOWERCASE )
		  lbeStyle |= ES_LOWERCASE;
	      else if( lphc->dwStyle & CBS_UPPERCASE )
		  lbeStyle |= ES_UPPERCASE;

              if (!IsWindowEnabled(hwnd)) lbeStyle |= WS_DISABLED;

              if (unicode)
                  lphc->hWndEdit = CreateWindowExW(0, editName, NULL, lbeStyle,
                                                   lphc->textRect.left, lphc->textRect.top,
                                                   lphc->textRect.right - lphc->textRect.left,
                                                   lphc->textRect.bottom - lphc->textRect.top,
                                                   hwnd, (HMENU)ID_CB_EDIT,
                                                   (HINSTANCE)GetWindowLongPtrW( hwnd, GWLP_HINSTANCE ), NULL );
              else
                  lphc->hWndEdit = CreateWindowExA(0, "Edit", NULL, lbeStyle,
                                                   lphc->textRect.left, lphc->textRect.top,
                                                   lphc->textRect.right - lphc->textRect.left,
                                                   lphc->textRect.bottom - lphc->textRect.top,
                                                   hwnd, (HMENU)ID_CB_EDIT,
                                                   (HINSTANCE)GetWindowLongPtrW( hwnd, GWLP_HINSTANCE ), NULL );

	      if( !lphc->hWndEdit )
		bEdit = FALSE;
	  }

          if( bEdit )
	  {
	    if( CB_GETTYPE(lphc) != CBS_SIMPLE )
	    {
              /* Now do the trick with parent */
	      SetParent(lphc->hWndLBox, HWND_DESKTOP);
              /*
               * If the combo is a dropdown, we must resize the control
	       * to fit only the text area and button. To do this,
	       * we send a dummy resize and the WM_WINDOWPOSCHANGING message
	       * will take care of setting the height for us.
               */
	      CBForceDummyResize(lphc);
	    }

	    TRACE("init done\n");
	    return 0;
	  }
	  ERR("edit control failure.\n");
      } else ERR("listbox failure.\n");
  } else ERR("no owner for visible combo.\n");

  /* CreateWindow() will send WM_NCDESTROY to cleanup */

  return -1;
}

/***********************************************************************
 *           CBPaintButton
 *
 * Paint combo button (normal, pressed, and disabled states).
 */
static void CBPaintButton( LPHEADCOMBO lphc, HDC hdc, RECT rectButton)
{
    UINT buttonState = DFCS_SCROLLCOMBOBOX;

    if( lphc->wState & CBF_NOREDRAW )
      return;


    if (lphc->wState & CBF_BUTTONDOWN)
	buttonState |= DFCS_PUSHED;

    if (CB_DISABLED(lphc))
	buttonState |= DFCS_INACTIVE;

    DrawFrameControl(hdc, &rectButton, DFC_SCROLL, buttonState);
}

/***********************************************************************
 *           CBPaintText
 *
 * Paint CBS_DROPDOWNLIST text field / update edit control contents.
 */
static void CBPaintText(
  LPHEADCOMBO lphc,
  HDC         hdc,
  RECT        rectEdit)
{
   INT	id, size = 0;
   LPWSTR pText = NULL;

   if( lphc->wState & CBF_NOREDRAW ) return;

   TRACE("\n");

   /* follow Windows combobox that sends a bunch of text
    * inquiries to its listbox while processing WM_PAINT. */

   if( (id = SendMessageW(lphc->hWndLBox, LB_GETCURSEL, 0, 0) ) != LB_ERR )
   {
        size = SendMessageW(lphc->hWndLBox, LB_GETTEXTLEN, id, 0);
	if (size == LB_ERR)
	  FIXME("LB_ERR probably not handled yet\n");
        if( (pText = HeapAlloc( GetProcessHeap(), 0, (size + 1) * sizeof(WCHAR))) )
	{
            /* size from LB_GETTEXTLEN may be too large, from LB_GETTEXT is accurate */
	    size=SendMessageW(lphc->hWndLBox, LB_GETTEXT, (WPARAM)id, (LPARAM)pText);
	    pText[size] = '\0';	/* just in case */
	} else return;
   }
   else
       if( !CB_OWNERDRAWN(lphc) )
	   return;

   if( lphc->wState & CBF_EDIT )
   {
        static const WCHAR empty_stringW[] = { 0 };
	if( CB_HASSTRINGS(lphc) ) SetWindowTextW( lphc->hWndEdit, pText ? pText : empty_stringW );
	if( lphc->wState & CBF_FOCUSED )
	    SendMessageW(lphc->hWndEdit, EM_SETSEL, 0, (LPARAM)(-1));
   }
   else /* paint text field ourselves */
   {
     UINT	itemState = ODS_COMBOBOXEDIT;
     HFONT	hPrevFont = (lphc->hFont) ? SelectObject(hdc, lphc->hFont) : 0;

     /*
      * Give ourselves some space.
      */
     InflateRect( &rectEdit, -1, -1 );

     if( CB_OWNERDRAWN(lphc) )
     {
       DRAWITEMSTRUCT dis;
       HRGN           clipRegion;
       UINT ctlid = (UINT)GetWindowLongPtrW( lphc->self, GWLP_ID );

       /* setup state for DRAWITEM message. Owner will highlight */
       if ( (lphc->wState & CBF_FOCUSED) &&
	    !(lphc->wState & CBF_DROPPED) )
	   itemState |= ODS_SELECTED | ODS_FOCUS;

       /*
	* Save the current clip region.
	* To retrieve the clip region, we need to create one "dummy"
	* clip region.
	*/
       clipRegion = CreateRectRgnIndirect(&rectEdit);

       if (GetClipRgn(hdc, clipRegion)!=1)
       {
	 DeleteObject(clipRegion);
	 clipRegion=NULL;
       }

       if (!IsWindowEnabled(lphc->self) & WS_DISABLED) itemState |= ODS_DISABLED;

       dis.CtlType	= ODT_COMBOBOX;
       dis.CtlID	= ctlid;
       dis.hwndItem	= lphc->self;
       dis.itemAction	= ODA_DRAWENTIRE;
       dis.itemID	= id;
       dis.itemState	= itemState;
       dis.hDC		= hdc;
       dis.rcItem	= rectEdit;
       dis.itemData	= SendMessageW(lphc->hWndLBox, LB_GETITEMDATA,
					(WPARAM)id, 0 );

       /*
	* Clip the DC and have the parent draw the item.
	*/
       IntersectClipRect(hdc,
			 rectEdit.left,  rectEdit.top,
			 rectEdit.right, rectEdit.bottom);

       SendMessageW(lphc->owner, WM_DRAWITEM, ctlid, (LPARAM)&dis );

       /*
	* Reset the clipping region.
	*/
       SelectClipRgn(hdc, clipRegion);
     }
     else
     {
       static const WCHAR empty_stringW[] = { 0 };

       if ( (lphc->wState & CBF_FOCUSED) &&
	    !(lphc->wState & CBF_DROPPED) ) {

	   /* highlight */
	   FillRect( hdc, &rectEdit, GetSysColorBrush(COLOR_HIGHLIGHT) );
	   SetBkColor( hdc, GetSysColor( COLOR_HIGHLIGHT ) );
	   SetTextColor( hdc, GetSysColor( COLOR_HIGHLIGHTTEXT ) );
       }

       ExtTextOutW( hdc,
		    rectEdit.left + 1,
		    rectEdit.top + 1,
		    ETO_OPAQUE | ETO_CLIPPED,
		    &rectEdit,
		    pText ? pText : empty_stringW , size, NULL );

       if(lphc->wState & CBF_FOCUSED && !(lphc->wState & CBF_DROPPED))
	 DrawFocusRect( hdc, &rectEdit );
     }

     if( hPrevFont )
       SelectObject(hdc, hPrevFont );
   }
   if (pText)
	HeapFree( GetProcessHeap(), 0, pText );
}

/***********************************************************************
 *           CBPaintBorder
 */
static void CBPaintBorder(
  HWND        hwnd,
  LPHEADCOMBO lphc,
  HDC         hdc)
{
  RECT clientRect;

  if (CB_GETTYPE(lphc) != CBS_SIMPLE)
  {
    GetClientRect(hwnd, &clientRect);
  }
  else
  {
    CopyRect(&clientRect, &lphc->textRect);

    InflateRect(&clientRect, EDIT_CONTROL_PADDING(), EDIT_CONTROL_PADDING());
    InflateRect(&clientRect, COMBO_XBORDERSIZE(), COMBO_YBORDERSIZE());
  }

  DrawEdge(hdc, &clientRect, EDGE_SUNKEN, BF_RECT);
}

/***********************************************************************
 *           COMBO_PrepareColors
 *
 * This method will sent the appropriate WM_CTLCOLOR message to
 * prepare and setup the colors for the combo's DC.
 *
 * It also returns the brush to use for the background.
 */
static HBRUSH COMBO_PrepareColors(