toolbar.c

winNT技术操作系统,国外开放的原代码和LIUX一样

    if (dwBaseCustDraw & CDRF_NOTIFYPOSTPAINT)
    {
	ZeroMemory (&tbcd, sizeof(NMTBCUSTOMDRAW));
	tbcd.nmcd.dwDrawStage = CDDS_POSTPAINT;
	tbcd.nmcd.hdc = hdc;
	tbcd.nmcd.rc = ps->rcPaint;
	ntfret = TOOLBAR_SendNotify(&tbcd.nmcd.hdr, infoPtr, NM_CUSTOMDRAW);
    }
}

/***********************************************************************
* 		TOOLBAR_MeasureString
*
* This function gets the width and height of a string in pixels. This
* is done first by using GetTextExtentPoint to get the basic width
* and height. The DrawText is called with DT_CALCRECT to get the exact
* width. The reason is because the text may have more than one "&" (or
* prefix characters as M$ likes to call them). The prefix character
* indicates where the underline goes, except for the string "&&" which
* is reduced to a single "&". GetTextExtentPoint does not process these
* only DrawText does. Note that the BTNS_NOPREFIX is handled here.
*/
static void
TOOLBAR_MeasureString(TOOLBAR_INFO *infoPtr, TBUTTON_INFO *btnPtr,
		      HDC hdc, LPSIZE lpSize)
{
    RECT myrect;

    lpSize->cx = 0;
    lpSize->cy = 0;

    if (infoPtr->nMaxTextRows > 0 &&
        !(btnPtr->fsState & TBSTATE_HIDDEN) &&
        (!(infoPtr->dwExStyle & TBSTYLE_EX_MIXEDBUTTONS) ||
        (btnPtr->fsStyle & BTNS_SHOWTEXT)) )
    {
        LPWSTR lpText = TOOLBAR_GetText(infoPtr, btnPtr);

	if(lpText != NULL) {
	    /* first get size of all the text */
	    GetTextExtentPoint32W (hdc, lpText, strlenW (lpText), lpSize);

	    /* feed above size into the rectangle for DrawText */
	    myrect.left = myrect.top = 0;
	    myrect.right = lpSize->cx;
	    myrect.bottom = lpSize->cy;

	    /* Use DrawText to get true size as drawn (less pesky "&") */
	    DrawTextW (hdc, lpText, -1, &myrect, DT_VCENTER | DT_SINGLELINE |
	    	   DT_CALCRECT | ((btnPtr->fsStyle & BTNS_NOPREFIX) ?
				  DT_NOPREFIX : 0));

	    /* feed back to caller  */
	    lpSize->cx = myrect.right;
	    lpSize->cy = myrect.bottom;
	}
    }

    TRACE("string size %d x %d!\n", lpSize->cx, lpSize->cy);
}

/***********************************************************************
* 		TOOLBAR_CalcStrings
*
* This function walks through each string and measures it and returns
* the largest height and width to caller.
*/
static void
TOOLBAR_CalcStrings (HWND hwnd, LPSIZE lpSize)
{
    TOOLBAR_INFO *infoPtr = TOOLBAR_GetInfoPtr (hwnd);
    TBUTTON_INFO *btnPtr;
    INT i;
    SIZE sz;
    HDC hdc;
    HFONT hOldFont;

    lpSize->cx = 0;
    lpSize->cy = 0;

    if (infoPtr->nMaxTextRows == 0)
        return;

    hdc = GetDC (hwnd);
    hOldFont = SelectObject (hdc, infoPtr->hFont);

    if (infoPtr->nNumButtons == 0 && infoPtr->nNumStrings > 0)
    {
        TEXTMETRICW tm;

        GetTextMetricsW(hdc, &tm);
        lpSize->cy = tm.tmHeight;
    }

    btnPtr = infoPtr->buttons;
    for (i = 0; i < infoPtr->nNumButtons; i++, btnPtr++) {
        if(TOOLBAR_HasText(infoPtr, btnPtr))
        {
            TOOLBAR_MeasureString(infoPtr, btnPtr, hdc, &sz);
            if (sz.cx > lpSize->cx)
                lpSize->cx = sz.cx;
            if (sz.cy > lpSize->cy)
                lpSize->cy = sz.cy;
        }
    }

    SelectObject (hdc, hOldFont);
    ReleaseDC (hwnd, hdc);

    TRACE("max string size %d x %d!\n", lpSize->cx, lpSize->cy);
}

/***********************************************************************
* 		TOOLBAR_WrapToolbar
*
* This function walks through the buttons and separators in the
* toolbar, and sets the TBSTATE_WRAP flag only on those items where
* wrapping should occur based on the width of the toolbar window.
* It does *not* calculate button placement itself.  That task
* takes place in TOOLBAR_CalcToolbar. If the program wants to manage
* the toolbar wrapping on its own, it can use the TBSTYLE_WRAPABLE
* flag, and set the TBSTATE_WRAP flags manually on the appropriate items.
*
* Note: TBSTYLE_WRAPABLE or TBSTYLE_EX_UNDOC1 can be used also to allow
* vertical toolbar lists.
*/

static void
TOOLBAR_WrapToolbar( HWND hwnd, DWORD dwStyle )
{
    TOOLBAR_INFO *infoPtr = TOOLBAR_GetInfoPtr (hwnd);
    TBUTTON_INFO *btnPtr;
    INT x, cx, i, j;
    RECT rc;
    BOOL bWrap, bButtonWrap;

    /* 	When the toolbar window style is not TBSTYLE_WRAPABLE,	*/
    /*	no layout is necessary. Applications may use this style */
    /*	to perform their own layout on the toolbar. 		*/
    if( !(dwStyle & TBSTYLE_WRAPABLE) &&
	!(infoPtr->dwExStyle & TBSTYLE_EX_UNDOC1) )  return;

    btnPtr = infoPtr->buttons;
    x  = infoPtr->nIndent;

    if (GetParent(hwnd))
    {
        /* this can get the parents width, to know how far we can extend
         * this toolbar.  We cannot use its height, as there may be multiple
         * toolbars in a rebar control
         */
        GetClientRect( GetParent(hwnd), &rc );
        infoPtr->nWidth = rc.right - rc.left;
    }
    else
    {
        GetWindowRect( hwnd, &rc );
        infoPtr->nWidth = rc.right - rc.left;
    }

    bButtonWrap = FALSE;

    TRACE("start ButtonWidth=%d, BitmapWidth=%d, nWidth=%d, nIndent=%d\n",
	  infoPtr->nButtonWidth, infoPtr->nBitmapWidth, infoPtr->nWidth,
	  infoPtr->nIndent);

    for (i = 0; i < infoPtr->nNumButtons; i++ )
    {
	bWrap = FALSE;
	btnPtr[i].fsState &= ~TBSTATE_WRAP;

	if (btnPtr[i].fsState & TBSTATE_HIDDEN)
	    continue;

	/* UNDOCUMENTED: If a separator has a non zero bitmap index, */
	/* it is the actual width of the separator. This is used for */
	/* custom controls in toolbars.                              */
	/*                                                           */
	/* BTNS_DROPDOWN separators are treated as buttons for    */
	/* width.  - GA 8/01                                         */
	if ((btnPtr[i].fsStyle & BTNS_SEP) &&
	    !(btnPtr[i].fsStyle & BTNS_DROPDOWN))
	    cx = (btnPtr[i].iBitmap > 0) ?
			btnPtr[i].iBitmap : SEPARATOR_WIDTH;
	else
	    cx = infoPtr->nButtonWidth;

	/* Two or more adjacent separators form a separator group.   */
	/* The first separator in a group should be wrapped to the   */
	/* next row if the previous wrapping is on a button.	     */
	if( bButtonWrap &&
		(btnPtr[i].fsStyle & BTNS_SEP) &&
		(i + 1 < infoPtr->nNumButtons ) &&
		(btnPtr[i + 1].fsStyle & BTNS_SEP) )
	{
	    TRACE("wrap point 1 btn %d style %02x\n", i, btnPtr[i].fsStyle);
	    btnPtr[i].fsState |= TBSTATE_WRAP;
	    x = infoPtr->nIndent;
	    i++;
	    bButtonWrap = FALSE;
	    continue;
	}

	/* The layout makes sure the bitmap is visible, but not the button. */
	/* Test added to also wrap after a button that starts a row but     */
	/* is bigger than the area.  - GA  8/01                             */
	if (( x + cx - (infoPtr->nButtonWidth - infoPtr->nBitmapWidth) / 2
	   > infoPtr->nWidth ) ||
	    ((x == infoPtr->nIndent) && (cx > infoPtr->nWidth)))
	{
	    BOOL bFound = FALSE;

	    /* 	If the current button is a separator and not hidden,  */
	    /*	go to the next until it reaches a non separator.      */
	    /*	Wrap the last separator if it is before a button.     */
	    while( ( ((btnPtr[i].fsStyle & BTNS_SEP) &&
		      !(btnPtr[i].fsStyle & BTNS_DROPDOWN)) ||
		     (btnPtr[i].fsState & TBSTATE_HIDDEN) ) &&
			i < infoPtr->nNumButtons )
	    {
		i++;
		bFound = TRUE;
	    }

	    if( bFound && i < infoPtr->nNumButtons )
	    {
		i--;
		TRACE("wrap point 2 btn %d style %02x, x=%d, cx=%d\n",
		      i, btnPtr[i].fsStyle, x, cx);
		btnPtr[i].fsState |= TBSTATE_WRAP;
		x = infoPtr->nIndent;
		bButtonWrap = FALSE;
		continue;
	    }
	    else if ( i >= infoPtr->nNumButtons)
		break;

	    /* 	If the current button is not a separator, find the last  */
	    /*	separator and wrap it.   				 */
	    for ( j = i - 1; j >= 0  &&  !(btnPtr[j].fsState & TBSTATE_WRAP); j--)
	    {
		if ((btnPtr[j].fsStyle & BTNS_SEP) &&
			!(btnPtr[j].fsState & TBSTATE_HIDDEN))
		{
		    bFound = TRUE;
		    i = j;
		    TRACE("wrap point 3 btn %d style %02x, x=%d, cx=%d\n",
			  i, btnPtr[i].fsStyle, x, cx);
		    x = infoPtr->nIndent;
		    btnPtr[j].fsState |= TBSTATE_WRAP;
		    bButtonWrap = FALSE;
		    break;
		}
	    }

	    /* 	If no separator available for wrapping, wrap one of 	*/
	    /*  non-hidden previous button.  			     	*/
	    if (!bFound)
	    {
		for ( j = i - 1;
			j >= 0 && !(btnPtr[j].fsState & TBSTATE_WRAP); j--)
		{
		    if (btnPtr[j].fsState & TBSTATE_HIDDEN)
			continue;

		    bFound = TRUE;
		    i = j;
		    TRACE("wrap point 4 btn %d style %02x, x=%d, cx=%d\n",
			  i, btnPtr[i].fsStyle, x, cx);
		    x = infoPtr->nIndent;
		    btnPtr[j].fsState |= TBSTATE_WRAP;
		    bButtonWrap = TRUE;
		    break;
		}
	    }

	    /* If all above failed, wrap the current button. */
	    if (!bFound)
	    {
		TRACE("wrap point 5 btn %d style %02x, x=%d, cx=%d\n",
		      i, btnPtr[i].fsStyle, x, cx);
		btnPtr[i].fsState |= TBSTATE_WRAP;
		bFound = TRUE;
		x = infoPtr->nIndent;
		if (btnPtr[i].fsStyle & BTNS_SEP )
		    bButtonWrap = FALSE;
		else
		    bButtonWrap = TRUE;
	    }
	}
	else {
	    TRACE("wrap point 6 btn %d style %02x, x=%d, cx=%d\n",
		  i, btnPtr[i].fsStyle, x, cx);
	    x += cx;
	}
    }
}


/***********************************************************************
* 		TOOLBAR_MeasureButton
*
* Calculates the width and height required for a button. Used in
* TOOLBAR_CalcToolbar to set the all-button width and height and also for
* the width of buttons that are autosized.
*
* Note that it would have been rather elegant to use one piece of code for
* both the laying out of the toolbar and for controlling where button parts
* are drawn, but the native control has inconsistencies between the two that
* prevent this from being effectively. These inconsistencies can be seen as
* artefacts where parts of the button appear outside of the bounding button
* rectangle.
*
* There are several cases for the calculation of the button dimensions and
* button part positioning:
*
* List
* ====
*
* With Bitmap:
*
* +--------------------------------------------------------+ ^
* |                    ^                     ^             | |
* |                    | pad.cy / 2          | centred     | |
* | pad.cx/2 + cxedge +--------------+     +------------+  | | DEFPAD_CY +
* |<----------------->| nBitmapWidth |     | Text       |  | | max(nBitmapHeight, szText.cy)
* |                   |<------------>|     |            |  | |
* |                   +--------------+     +------------+  | |
* |<-------------------------------------->|               | |
* |  cxedge + iListGap + nBitmapWidth + 2  |<----------->  | |
* |                                           szText.cx    | |
* +--------------------------------------------------------+ -
* <-------------------------------------------------------->
*  2*cxedge + nBitmapWidth + iListGap + szText.cx + pad.cx
*
* Without Bitmap (I_IMAGENONE):
*
* +-----------------------------------+ ^
* |                     ^             | |
* |                     | centred     | | LISTPAD_CY +
* |                   +------------+  | | szText.cy
* |                   | Text       |  | |
* |                   |            |  | |
* |                   +------------+  | |
* |<----------------->|               | |
* |      cxedge       |<----------->  | |
* |                      szText.cx    | |
* +-----------------------------------+ -
* <----------------------------------->
*          szText.cx + pad.cx
*
* Without text:
*
* +--------------------------------------+ ^
* |                       ^              | |
* |                       | padding.cy/2 | | DEFPAD_CY +
* |                     +------------+   | | nBitmapHeight
* |                     | Bitmap     |   | |
* |                     |            |   | |
* |                     +------------+   | |
* |<------------------->|                | |
* | cxedge + iListGap/2 |<----------->   | |
* |                       nBitmapWidth   | |
* +--------------------------------------+ -
* <-------------------------------------->
*     2*cxedge + nBitmapWidth + iListGap
*
* Non-List
* ========
*
* With bitmap:
*
* +-----------------------------------+ ^
* |                     ^             | |
* |                     | pad.cy / 2  | | nBitmapHeight +
* |                     -             | | szText.cy +
* |                   +------------+  | | DEFPAD_CY + 1
* |    centred        |   Bitmap   |  | |
* |<----------------->|            |  | |
* |                   +------------+  | |
* |                         ^         | |
* |                       1 |         | |
* |                         -         | |