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Mousewheel support.

This commit is contained in:
Stephane Lussier 2000-04-19 16:45:30 +00:00 committed by Alexandre Julliard
parent 180a088beb
commit 30316dd5f6
1 changed files with 32 additions and 0 deletions
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32
dlls/comctl32/treeview.c
View File

@ -3479,6 +3479,33 @@ TREEVIEW_HScroll (HWND hwnd, WPARAM wParam, LPARAM lParam)
return TRUE;
}
static LRESULT TREEVIEW_MouseWheel (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
TREEVIEW_INFO *infoPtr = TREEVIEW_GetInfoPtr(hwnd);
short gcWheelDelta = 0;
UINT pulScrollLines = 3;
SystemParametersInfoW(SPI_GETWHEELSCROLLLINES,0, &pulScrollLines, 0);
gcWheelDelta -= (short) HIWORD(wParam);
pulScrollLines *= (gcWheelDelta / WHEEL_DELTA);
if (abs(gcWheelDelta) >= WHEEL_DELTA && pulScrollLines)
{
int wheelDy = pulScrollLines * infoPtr->uRealItemHeight;
int newDy = infoPtr->cy + wheelDy;
int maxDy = infoPtr->uTotalHeight - infoPtr->uVisibleHeight;
if (newDy > maxDy) newDy = maxDy;
if (newDy < 0) newDy = 0;
if (newDy == infoPtr->cy) return TRUE;
TREEVIEW_VScroll(hwnd, MAKEWPARAM(SB_THUMBTRACK,newDy),0);
}
return TRUE;
}
static LRESULT
TREEVIEW_KeyDown (HWND hwnd, WPARAM wParam, LPARAM lParam)
@ -3908,6 +3935,11 @@ TREEVIEW_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
case WM_VSCROLL:
return TREEVIEW_VScroll (hwnd, wParam, lParam);
case WM_MOUSEWHEEL:
if (wParam & (MK_SHIFT | MK_CONTROL))
return DefWindowProcA( hwnd, uMsg, wParam, lParam );
return TREEVIEW_MouseWheel (hwnd, wParam, lParam);
case WM_DRAWITEM:
TRACE ("drawItem\n");
return DefWindowProcA (hwnd, uMsg, wParam, lParam);