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[0.4.14][COMCTL32] combo: Fix regression CORE-18769

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Grab a tiny piece of 0.4.15-dev-8612-g 0707475f69 [COMCTL32] 'Sync comctl32 to wine 5.0' from PR6789
(the unmerged PR6970 is a subset of that and shows the diff more clearly)
This shall fix/improve on CORE-18769 '[COMCTL32] Comboboxes v6 with many elements do auto-close erroneously with low vertical resolution when clicking on the text'
The result is not entirely perfect yet, there is still a case left that is hard to trigger which will lead the down-arrow remaining in pressed state,
which is very hard to trigger intentionally. The updated state is definitely a big improvement though.
The regression was introduced by 0.4.12-dev-882-g e3e173ffaa
which is the reason why I won't port this back further than releases/0.4.12

The size of comctl32 does shrink slightly:
comctl32.dll master    RosBEWin2.2.2 GCC8.4.0dbg x86               2.028.544 (0.4.16-dev-122-g325d74c)
comctl32.dll 0.4.15rls RosBEWin2.2.2 GCC8.4.0dbg x86               2.028.544 (0.4.15-5-g7791a36)
comctl32.dll 0.4.14rls RosBEWin2.2.2 GCC8.4.0dbg x86  1.979.904 -> 1.978.880
comctl32.dll 0.4.14rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.791.488 -> 1.790.464
comctl32.dll 0.4.13rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.783.808 -> 1.783.808
comctl32.dll 0.4.12rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.796.608 -> 1.796.096
Here are for comparison the sizes of even older branches (that I didn't touch today):
comctl32.dll 0.4.11rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.789.440
comctl32.dll 0.4.10rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.786.880
comctl32.dll 0.4. 9rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.785.344
comctl32.dll 0.4. 8rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.611.264
comctl32.dll 0.4. 7rls RosBEWin2.1.6 GCC4.7.2dbg x86  1.583.616
This commit is contained in:
Joachim Henze 2024-10-13 13:11:16 +02:00
parent ece383c929
commit 5b02d3862a
2 changed files with 153 additions and 210 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

359
dll/win32/comctl32/combo.c
View File

@ -32,7 +32,6 @@
#include "uxtheme.h"
#include "vssym32.h"
#include "commctrl.h"
#include "wine/unicode.h"
#include "wine/debug.h"
#include "wine/heap.h"
@ -79,6 +78,9 @@ static UINT CBitHeight, CBitWidth;
#define ID_CB_LISTBOX 1000
#define ID_CB_EDIT 1001
static void CBCalcPlacement(HEADCOMBO *combo);
static void CBResetPos(HEADCOMBO *combo);
/***********************************************************************
* COMBO_Init
*
@ -170,6 +172,25 @@ static LRESULT COMBO_NCDestroy( HEADCOMBO *lphc )
return 0;
}
static INT combo_get_text_height(const HEADCOMBO *combo)
{
HDC hdc = GetDC(combo->self);
HFONT prev_font = 0;
TEXTMETRICW tm;
if (combo->hFont)
prev_font = SelectObject(hdc, combo->hFont);
GetTextMetricsW(hdc, &tm);
if (prev_font)
SelectObject(hdc, prev_font);
ReleaseDC(combo->self, hdc);
return tm.tmHeight + 4;
}
/***********************************************************************
* CBGetTextAreaHeight
*
@ -182,37 +203,18 @@ static LRESULT COMBO_NCDestroy( HEADCOMBO *lphc )
* This height was determined through experimentation.
* CBCalcPlacement will add 2*COMBO_YBORDERSIZE pixels for the border
*/
static INT CBGetTextAreaHeight(
HWND hwnd,
LPHEADCOMBO lphc)
static INT CBGetTextAreaHeight(HEADCOMBO *lphc, BOOL clip_item_height)
{
INT iTextItemHeight;
INT item_height, text_height;
if( lphc->editHeight ) /* explicitly set height */
if (clip_item_height && !CB_OWNERDRAWN(lphc))
{
iTextItemHeight = lphc->editHeight;
text_height = combo_get_text_height(lphc);
if (lphc->item_height < text_height)
lphc->item_height = text_height;
}
else
{
TEXTMETRICW tm;
HDC hDC = GetDC(hwnd);
HFONT hPrevFont = 0;
INT baseUnitY;
item_height = lphc->item_height;
if (lphc->hFont)
hPrevFont = SelectObject( hDC, lphc->hFont );
GetTextMetricsW(hDC, &tm);
baseUnitY = tm.tmHeight;
if( hPrevFont )
SelectObject( hDC, hPrevFont );
ReleaseDC(hwnd, hDC);
iTextItemHeight = baseUnitY + 4;
}
/*
* Check the ownerdraw case if we haven't asked the parent the size
@ -223,13 +225,13 @@ static INT CBGetTextAreaHeight(
{
MEASUREITEMSTRUCT measureItem;
RECT clientRect;
INT originalItemHeight = iTextItemHeight;
INT originalItemHeight = item_height;
UINT id = (UINT)GetWindowLongPtrW( lphc->self, GWLP_ID );
/*
* We use the client rect for the width of the item.
*/
GetClientRect(hwnd, &clientRect);
GetClientRect(lphc->self, &clientRect);
lphc->wState &= ~CBF_MEASUREITEM;
@ -240,10 +242,10 @@ static INT CBGetTextAreaHeight(
measureItem.CtlID = id;
measureItem.itemID = -1;
measureItem.itemWidth = clientRect.right;
measureItem.itemHeight = iTextItemHeight - 6; /* ownerdrawn cb is taller */
measureItem.itemHeight = item_height - 6; /* ownerdrawn cb is taller */
measureItem.itemData = 0;
SendMessageW(lphc->owner, WM_MEASUREITEM, id, (LPARAM)&measureItem);
iTextItemHeight = 6 + measureItem.itemHeight;
item_height = 6 + measureItem.itemHeight;
/*
* Send a second one in the case of a fixed ownerdraw list to calculate the
@ -264,10 +266,10 @@ static INT CBGetTextAreaHeight(
/*
* Keep the size for the next time
*/
lphc->editHeight = iTextItemHeight;
lphc->item_height = item_height;
}
return iTextItemHeight;
return item_height;
}
/***********************************************************************
@ -277,13 +279,12 @@ static INT CBGetTextAreaHeight(
* a re-arranging of the contents of the combobox and the recalculation
* of the size of the "real" control window.
*/
static void CBForceDummyResize(
LPHEADCOMBO lphc)
static void CBForceDummyResize(LPHEADCOMBO lphc)
{
RECT windowRect;
int newComboHeight;
newComboHeight = CBGetTextAreaHeight(lphc->self,lphc) + 2*COMBO_YBORDERSIZE();
newComboHeight = CBGetTextAreaHeight(lphc, FALSE) + 2*COMBO_YBORDERSIZE();
GetWindowRect(lphc->self, &windowRect);
@ -295,12 +296,17 @@ static void CBForceDummyResize(
* this will cancel-out in the processing of the WM_WINDOWPOSCHANGING
* message.
*/
lphc->wState |= CBF_NORESIZE;
SetWindowPos( lphc->self,
NULL,
0, 0,
windowRect.right - windowRect.left,
newComboHeight,
SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE );
lphc->wState &= ~CBF_NORESIZE;
CBCalcPlacement(lphc);
CBResetPos(lphc);
}
/***********************************************************************
@ -308,111 +314,67 @@ static void CBForceDummyResize(
*
* Set up component coordinates given valid lphc->RectCombo.
*/
static void CBCalcPlacement(
HWND hwnd,
LPHEADCOMBO lphc,
LPRECT lprEdit,
LPRECT lprButton,
LPRECT lprLB)
static void CBCalcPlacement(HEADCOMBO *combo)
{
/*
* Again, start with the client rectangle.
*/
GetClientRect(hwnd, lprEdit);
/* Start with the client rectangle. */
GetClientRect(combo->self, &combo->textRect);
/*
* Remove the borders
*/
InflateRect(lprEdit, -COMBO_XBORDERSIZE(), -COMBO_YBORDERSIZE());
/* Remove the borders */
InflateRect(&combo->textRect, -COMBO_XBORDERSIZE(), -COMBO_YBORDERSIZE());
/*
* Chop off the bottom part to fit with the height of the text area.
*/
lprEdit->bottom = lprEdit->top + CBGetTextAreaHeight(hwnd, lphc);
/* Chop off the bottom part to fit with the height of the text area. */
combo->textRect.bottom = combo->textRect.top + CBGetTextAreaHeight(combo, FALSE);
/*
* The button starts the same vertical position as the text area.
*/
CopyRect(lprButton, lprEdit);
/* The button starts the same vertical position as the text area. */
combo->buttonRect = combo->textRect;
/*
* If the combobox is "simple" there is no button.
*/
if( CB_GETTYPE(lphc) == CBS_SIMPLE )
lprButton->left = lprButton->right = lprButton->bottom = 0;
else
{
/*
* Let's assume the combobox button is the same width as the
* scrollbar button.
* size the button horizontally and cut-off the text area.
*/
lprButton->left = lprButton->right - GetSystemMetrics(SM_CXVSCROLL);
lprEdit->right = lprButton->left;
}
/*
* In the case of a dropdown, there is an additional spacing between the
* text area and the button.
*/
if( CB_GETTYPE(lphc) == CBS_DROPDOWN )
{
lprEdit->right -= COMBO_EDITBUTTONSPACE();
}
/*
* If we have an edit control, we space it away from the borders slightly.
*/
if (CB_GETTYPE(lphc) != CBS_DROPDOWNLIST)
{
InflateRect(lprEdit, -EDIT_CONTROL_PADDING(), -EDIT_CONTROL_PADDING());
}
/*
* Adjust the size of the listbox popup.
*/
if( CB_GETTYPE(lphc) == CBS_SIMPLE )
{
/*
* Use the client rectangle to initialize the listbox rectangle
*/
GetClientRect(hwnd, lprLB);
/*
* Then, chop-off the top part.
*/
lprLB->top = lprEdit->bottom + COMBO_YBORDERSIZE();
}
else
{
/*
* Make sure the dropped width is as large as the combobox itself.
*/
if (lphc->droppedWidth < (lprButton->right + COMBO_XBORDERSIZE()))
/* If the combobox is "simple" there is no button. */
if (CB_GETTYPE(combo) == CBS_SIMPLE)
combo->buttonRect.left = combo->buttonRect.right = combo->buttonRect.bottom = 0;
else
{
lprLB->right = lprLB->left + (lprButton->right + COMBO_XBORDERSIZE());
/*
* Let's assume the combobox button is the same width as the
* scrollbar button.
* size the button horizontally and cut-off the text area.
*/
combo->buttonRect.left = combo->buttonRect.right - GetSystemMetrics(SM_CXVSCROLL);
combo->textRect.right = combo->buttonRect.left;
}
/*
* In the case of a dropdown, the popup listbox is offset to the right.
* so, we want to make sure it's flush with the right side of the
* combobox
*/
if( CB_GETTYPE(lphc) == CBS_DROPDOWN )
lprLB->right -= COMBO_EDITBUTTONSPACE();
/* In the case of a dropdown, there is an additional spacing between the text area and the button. */
if (CB_GETTYPE(combo) == CBS_DROPDOWN)
combo->textRect.right -= COMBO_EDITBUTTONSPACE();
/* If we have an edit control, we space it away from the borders slightly. */
if (CB_GETTYPE(combo) != CBS_DROPDOWNLIST)
InflateRect(&combo->textRect, -EDIT_CONTROL_PADDING(), -EDIT_CONTROL_PADDING());
/* Adjust the size of the listbox popup. */
if (CB_GETTYPE(combo) == CBS_SIMPLE)
{
GetClientRect(combo->self, &combo->droppedRect);
combo->droppedRect.top = combo->textRect.bottom + COMBO_YBORDERSIZE();
}
else
lprLB->right = lprLB->left + lphc->droppedWidth;
}
{
/* Make sure the dropped width is as large as the combobox itself. */
if (combo->droppedWidth < (combo->buttonRect.right + COMBO_XBORDERSIZE()))
{
combo->droppedRect.right = combo->droppedRect.left + (combo->buttonRect.right + COMBO_XBORDERSIZE());
/* don't allow negative window width */
if (lprEdit->right < lprEdit->left)
lprEdit->right = lprEdit->left;
/* In the case of a dropdown, the popup listbox is offset to the right. We want to make sure it's flush
with the right side of the combobox */
if (CB_GETTYPE(combo) == CBS_DROPDOWN)
combo->droppedRect.right -= COMBO_EDITBUTTONSPACE();
}
else
combo->droppedRect.right = combo->droppedRect.left + combo->droppedWidth;
}
TRACE("\ttext\t= (%s)\n", wine_dbgstr_rect(lprEdit));
TRACE("\tbutton\t= (%s)\n", wine_dbgstr_rect(lprButton));
TRACE("\tlbox\t= (%s)\n", wine_dbgstr_rect(lprLB));
/* Disallow negative window width */
if (combo->textRect.right < combo->textRect.left)
combo->textRect.right = combo->textRect.left;
}
/***********************************************************************
@ -444,11 +406,9 @@ static LRESULT COMBO_Create( HWND hwnd, LPHEADCOMBO lphc, HWND hwndParent, LONG
lphc->owner = hwndParent;
/*
* The item height and dropped width are not set when the control
* is created.
*/
lphc->droppedWidth = lphc->editHeight = 0;
lphc->droppedWidth = 0;
lphc->item_height = combo_get_text_height(lphc);
/*
* The first time we go through, we want to measure the ownerdraw item
@ -473,7 +433,7 @@ static LRESULT COMBO_Create( HWND hwnd, LPHEADCOMBO lphc, HWND hwndParent, LONG
* recalculated.
*/
GetClientRect( hwnd, &lphc->droppedRect );
CBCalcPlacement(hwnd, lphc, &lphc->textRect, &lphc->buttonRect, &lphc->droppedRect );
CBCalcPlacement(lphc);
/*
* Adjust the position of the popup listbox if it's necessary
@ -589,10 +549,13 @@ static LRESULT COMBO_Create( HWND hwnd, LPHEADCOMBO lphc, HWND hwndParent, LONG
*
* Paint combo button (normal, pressed, and disabled states).
*/
static void CBPaintButton( LPHEADCOMBO lphc, HDC hdc, RECT rectButton)
static void CBPaintButton(HEADCOMBO *lphc, HDC hdc)
{
UINT buttonState = DFCS_SCROLLCOMBOBOX;
if (IsRectEmpty(&lphc->buttonRect))
return;
if( lphc->wState & CBF_NOREDRAW )
return;
@ -603,7 +566,7 @@ static void CBPaintButton( LPHEADCOMBO lphc, HDC hdc, RECT rectButton)
if (CB_DISABLED(lphc))
buttonState |= DFCS_INACTIVE;
DrawFrameControl(hdc, &rectButton, DFC_SCROLL, buttonState);
DrawFrameControl(hdc, &lphc->buttonRect, DFC_SCROLL, buttonState);
}
/***********************************************************************
@ -777,16 +740,13 @@ static void CBPaintText(HEADCOMBO *lphc, HDC hdc_paint)
/***********************************************************************
* CBPaintBorder
*/
static void CBPaintBorder(
HWND hwnd,
const HEADCOMBO *lphc,
HDC hdc)
static void CBPaintBorder(const HEADCOMBO *lphc, HDC hdc)
{
RECT clientRect;
if (CB_GETTYPE(lphc) != CBS_SIMPLE)
{
GetClientRect(hwnd, &clientRect);
GetClientRect(lphc->self, &clientRect);
}
else
{
@ -857,10 +817,9 @@ static LRESULT COMBO_Paint(HEADCOMBO *lphc, HDC hdc)
/*
* In non 3.1 look, there is a sunken border on the combobox
*/
CBPaintBorder(lphc->self, lphc, hdc);
CBPaintBorder(lphc, hdc);
if (!IsRectEmpty(&lphc->buttonRect))
CBPaintButton(lphc, hdc, lphc->buttonRect);
CBPaintButton(lphc, hdc);
/* paint the edit control padding area */
if (CB_GETTYPE(lphc) != CBS_DROPDOWNLIST)
@ -1391,50 +1350,45 @@ static LRESULT COMBO_GetText( HEADCOMBO *lphc, INT count, LPWSTR buf )
* This function sets window positions according to the updated
* component placement struct.
*/
static void CBResetPos(
LPHEADCOMBO lphc,
const RECT *rectEdit,
const RECT *rectLB,
BOOL bRedraw)
static void CBResetPos(HEADCOMBO *combo)
{
BOOL bDrop = (CB_GETTYPE(lphc) != CBS_SIMPLE);
BOOL drop = CB_GETTYPE(combo) != CBS_SIMPLE;
/* NOTE: logs sometimes have WM_LBUTTONUP before a cascade of
* sizing messages */
/* NOTE: logs sometimes have WM_LBUTTONUP before a cascade of
* sizing messages */
if (combo->wState & CBF_EDIT)
SetWindowPos(combo->hWndEdit, 0, combo->textRect.left, combo->textRect.top,
combo->textRect.right - combo->textRect.left,
combo->textRect.bottom - combo->textRect.top,
SWP_NOZORDER | SWP_NOACTIVATE | (drop ? SWP_NOREDRAW : 0));
if( lphc->wState & CBF_EDIT )
SetWindowPos( lphc->hWndEdit, 0,
rectEdit->left, rectEdit->top,
rectEdit->right - rectEdit->left,
rectEdit->bottom - rectEdit->top,
SWP_NOZORDER | SWP_NOACTIVATE | ((bDrop) ? SWP_NOREDRAW : 0) );
SetWindowPos(combo->hWndLBox, 0, combo->droppedRect.left, combo->droppedRect.top,
combo->droppedRect.right - combo->droppedRect.left,
combo->droppedRect.bottom - combo->droppedRect.top,
SWP_NOACTIVATE | SWP_NOZORDER | (drop ? SWP_NOREDRAW : 0));
SetWindowPos( lphc->hWndLBox, 0,
rectLB->left, rectLB->top,
rectLB->right - rectLB->left,
rectLB->bottom - rectLB->top,
SWP_NOACTIVATE | SWP_NOZORDER | ((bDrop) ? SWP_NOREDRAW : 0) );
if (drop)
{
if (combo->wState & CBF_DROPPED)
{
combo->wState &= ~CBF_DROPPED;
ShowWindow(combo->hWndLBox, SW_HIDE);
}
if( bDrop )
{
if( lphc->wState & CBF_DROPPED )
{
lphc->wState &= ~CBF_DROPPED;
ShowWindow( lphc->hWndLBox, SW_HIDE );
}
if( bRedraw && !(lphc->wState & CBF_NOREDRAW) )
RedrawWindow( lphc->self, NULL, 0,
RDW_INVALIDATE | RDW_ERASE | RDW_UPDATENOW );
}
if (!(combo->wState & CBF_NOREDRAW))
RedrawWindow(combo->self, NULL, 0, RDW_INVALIDATE | RDW_ERASE | RDW_UPDATENOW);
}
}
/***********************************************************************
* COMBO_Size
*/
static void COMBO_Size( LPHEADCOMBO lphc )
static void COMBO_Size( HEADCOMBO *lphc )
{
if (!lphc->hWndLBox || (lphc->wState & CBF_NORESIZE))
return;
/*
* Those controls are always the same height. So we have to make sure
* they are not resized to another value.
@ -1447,7 +1401,7 @@ static void COMBO_Size( LPHEADCOMBO lphc )
GetWindowRect(lphc->self, &rc);
curComboHeight = rc.bottom - rc.top;
curComboWidth = rc.right - rc.left;
newComboHeight = CBGetTextAreaHeight(lphc->self, lphc) + 2*COMBO_YBORDERSIZE();
newComboHeight = CBGetTextAreaHeight(lphc, TRUE) + 2*COMBO_YBORDERSIZE();
/*
* Resizing a combobox has another side effect, it resizes the dropped
@ -1467,18 +1421,18 @@ static void COMBO_Size( LPHEADCOMBO lphc )
/*
* Restore original height
*/
if( curComboHeight != newComboHeight )
SetWindowPos(lphc->self, 0, 0, 0, curComboWidth, newComboHeight,
SWP_NOZORDER|SWP_NOMOVE|SWP_NOACTIVATE|SWP_NOREDRAW);
if (curComboHeight != newComboHeight)
{
lphc->wState |= CBF_NORESIZE;
SetWindowPos(lphc->self, 0, 0, 0, curComboWidth, newComboHeight,
SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE | SWP_NOREDRAW);
lphc->wState &= ~CBF_NORESIZE;
}
}
CBCalcPlacement(lphc->self,
lphc,
&lphc->textRect,
&lphc->buttonRect,
&lphc->droppedRect);
CBCalcPlacement(lphc);
CBResetPos( lphc, &lphc->textRect, &lphc->droppedRect, TRUE );
CBResetPos(lphc);
}
@ -1487,10 +1441,8 @@ static void COMBO_Size( LPHEADCOMBO lphc )
*/
static void COMBO_Font( LPHEADCOMBO lphc, HFONT hFont, BOOL bRedraw )
{
/*
* Set the font
*/
lphc->hFont = hFont;
lphc->item_height = combo_get_text_height(lphc);
/*
* Propagate to owned windows.
@ -1504,13 +1456,9 @@ static void COMBO_Font( LPHEADCOMBO lphc, HFONT hFont, BOOL bRedraw )
*/
if ( CB_GETTYPE(lphc) == CBS_SIMPLE)
{
CBCalcPlacement(lphc->self,
lphc,
&lphc->textRect,
&lphc->buttonRect,
&lphc->droppedRect);
CBCalcPlacement(lphc);
CBResetPos( lphc, &lphc->textRect, &lphc->droppedRect, TRUE );
CBResetPos(lphc);
}
else
{
@ -1530,20 +1478,16 @@ static LRESULT COMBO_SetItemHeight( LPHEADCOMBO lphc, INT index, INT height )
{
if( height < 32768 )
{
lphc->editHeight = height + 2; /* Is the 2 for 2*EDIT_CONTROL_PADDING? */
lphc->item_height = height + 2; /* Is the 2 for 2*EDIT_CONTROL_PADDING? */
/*
* Redo the layout of the control.
*/
if ( CB_GETTYPE(lphc) == CBS_SIMPLE)
{
CBCalcPlacement(lphc->self,
lphc,
&lphc->textRect,
&lphc->buttonRect,
&lphc->droppedRect);
CBCalcPlacement(lphc);
CBResetPos( lphc, &lphc->textRect, &lphc->droppedRect, TRUE );
CBResetPos(lphc);
}
else
{
@ -1794,8 +1738,7 @@ static LRESULT CALLBACK COMBO_WindowProc( HWND hwnd, UINT message, WPARAM wParam
}
case WM_SIZE:
if (lphc->hWndLBox && !(lphc->wState & CBF_NORESIZE))
COMBO_Size( lphc );
COMBO_Size( lphc );
return TRUE;
case WM_SETFONT:
@ -2006,7 +1949,7 @@ static LRESULT CALLBACK COMBO_WindowProc( HWND hwnd, UINT message, WPARAM wParam
case CB_GETITEMHEIGHT:
if ((INT)wParam >= 0) /* listbox item */
return SendMessageW(lphc->hWndLBox, LB_GETITEMHEIGHT, wParam, 0);
return CBGetTextAreaHeight(hwnd, lphc);
return CBGetTextAreaHeight(lphc, FALSE);
case CB_RESETCONTENT:
SendMessageW(lphc->hWndLBox, LB_RESETCONTENT, 0, 0);
@ -2049,7 +1992,7 @@ static LRESULT CALLBACK COMBO_WindowProc( HWND hwnd, UINT message, WPARAM wParam
lphc->droppedWidth = 0;
/* recalculate the combobox area */
CBCalcPlacement(hwnd, lphc, &lphc->textRect, &lphc->buttonRect, &lphc->droppedRect );
CBCalcPlacement(lphc);
/* fall through */
case CB_GETDROPPEDWIDTH:

4
dll/win32/comctl32/comctl32.h
View File

@ -153,8 +153,8 @@ typedef struct
RECT droppedRect;
INT droppedIndex;
INT fixedOwnerDrawHeight;
INT droppedWidth; /* last two are not used unless set */
INT editHeight; /* explicitly */
INT droppedWidth; /* not used unless set explicitly */
INT item_height;
INT visibleItems;
} HEADCOMBO, *LPHEADCOMBO;