409 lines
9 KiB
C
409 lines
9 KiB
C
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#include "ctlspriv.h"
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#define DF_ACTUALLYDRAG 0x0001
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#define DF_DEFERRED 0x0002
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#define INITLINESPERSECOND 6
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#define VERTCHANGENUMLINES 25
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#define TIMERID 238
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#define TIMERLEN 50
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#define DX_INSERT 16
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#define DY_INSERT 16
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typedef struct {
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HWND hwndDrag;
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UINT uFlags;
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} DRAGPROP, *PDRAGPROP;
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UINT uDragListMsg = 0;
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#ifndef WINNT
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#pragma data_seg(DATASEG_READONLY)
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#endif
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const TCHAR szDragListMsgString[] = DRAGLISTMSGSTRING;
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#ifndef WINNT
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#pragma data_seg()
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#endif
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BOOL PtInLBItem(HWND hLB, int nItem, POINT pt, int xInflate, int yInflate)
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{
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RECT rc;
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if (nItem < 0)
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nItem = (int)SendMessage(hLB, LB_GETCURSEL, 0, 0L);
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if (SendMessage(hLB, LB_GETITEMRECT, nItem, (LPARAM)(LPRECT)&rc) == LB_ERR)
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return(FALSE);
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InflateRect(&rc, xInflate, yInflate);
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return(PtInRect(&rc, pt));
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}
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/*
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* DragListSubclassProc
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* --------------------
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*
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* Window procedure for subclassed list boxes
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*/
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LRESULT CALLBACK DragListSubclassProc(HWND hLB, UINT uMsg, WPARAM wParam,
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LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
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{
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PDRAGPROP pDragProp;
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DRAGLISTINFO sNotify;
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BOOL bDragging;
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POINT pt;
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pDragProp = (PDRAGPROP)dwRefData;
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bDragging = pDragProp->hwndDrag == hLB;
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switch (uMsg)
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{
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case WM_NCDESTROY:
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if (bDragging)
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SendMessage(hLB, WM_RBUTTONDOWN, 0, 0L); /* cancel drag */
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RemoveWindowSubclass(hLB, DragListSubclassProc, 0);
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if (pDragProp)
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LocalFree((HLOCAL)pDragProp);
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break;
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case WM_LBUTTONDOWN:
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{
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int nItem;
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if (bDragging) /* nested button-down */
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SendMessage(hLB, WM_RBUTTONDOWN, 0, 0L); /* cancel drag */
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SetFocus(hLB);
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pt.x = GET_X_LPARAM(lParam);
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pt.y = GET_Y_LPARAM(lParam);
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ClientToScreen(hLB, &pt);
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nItem = LBItemFromPt(hLB, pt, FALSE);
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if (nItem >= 0)
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{
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SendMessage(hLB, LB_SETCURSEL, nItem, 0L);
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if (GetWindowLong(hLB, GWL_STYLE) & LBS_NOTIFY)
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SendMessage(GetParent(hLB), WM_COMMAND,
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GET_WM_COMMAND_MPS(GetDlgCtrlID(hLB), hLB, LBN_SELCHANGE));
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sNotify.uNotification = DL_BEGINDRAG;
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goto QueryParent;
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}
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else
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goto FakeDrag;
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}
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case WM_TIMER:
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if (wParam != TIMERID)
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break;
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lParam = GetMessagePosClient(hLB, &pt);
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// fall through
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case WM_MOUSEMOVE:
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if (bDragging)
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{
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HWND hwndParent;
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LRESULT lResult;
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/* We may be just simulating a drag, but not actually doing
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* anything.
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*/
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if (!(pDragProp->uFlags&DF_ACTUALLYDRAG))
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return(0L);
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/* We don't want to do any dragging until the user has dragged
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* outside of the current selection.
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*/
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if (pDragProp->uFlags & DF_DEFERRED)
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{
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pt.x = GET_X_LPARAM(lParam);
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pt.y = GET_Y_LPARAM(lParam);
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if (PtInLBItem(hLB, -1, pt, 0, 4))
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return 0;
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pDragProp->uFlags &= ~DF_DEFERRED;
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}
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sNotify.uNotification = DL_DRAGGING;
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QueryParent:
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hwndParent = GetParent(hLB);
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sNotify.hWnd = hLB;
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sNotify.ptCursor.x = GET_X_LPARAM(lParam);
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sNotify.ptCursor.y = GET_Y_LPARAM(lParam);
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ClientToScreen(hLB, &sNotify.ptCursor);
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lResult = SendMessage(hwndParent, uDragListMsg, GetDlgCtrlID(hLB),
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(LPARAM)(LPDRAGLISTINFO)&sNotify);
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if (uMsg == WM_LBUTTONDOWN)
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{
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/* Some things may not be draggable
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*/
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if (lResult)
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{
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SetTimer(hLB, TIMERID, TIMERLEN, NULL);
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pDragProp->uFlags = DF_DEFERRED | DF_ACTUALLYDRAG;
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}
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else
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{
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FakeDrag:
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pDragProp->uFlags = 0;
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}
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/* Set capture and change mouse cursor
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*/
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pDragProp->hwndDrag = hLB;
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SetCapture(hLB);
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}
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else
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{
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switch (lResult)
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{
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case DL_STOPCURSOR:
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SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_NO)));
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break;
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case DL_COPYCURSOR:
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SetCursor(LoadCursor(HINST_THISDLL, MAKEINTRESOURCE(IDC_COPY)));
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break;
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case DL_MOVECURSOR:
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SetCursor(LoadCursor(HINST_THISDLL, MAKEINTRESOURCE(IDC_MOVE)));
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break;
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default:
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break;
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}
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}
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/* Don't call the def proc, since it may try to change the
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* selection or set timers or things like that.
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*/
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return(0L);
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}
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break;
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case WM_RBUTTONDOWN:
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case WM_LBUTTONUP:
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/* if we are capturing mouse - release it and check for acceptable place
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* where mouse is now to decide drop or not
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*/
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if (bDragging)
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{
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HWND hwndParent;
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pDragProp->hwndDrag = NULL;
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KillTimer(hLB, TIMERID);
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ReleaseCapture();
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SetCursor(LoadCursor(NULL, IDC_ARROW));
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hwndParent = GetParent(hLB);
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sNotify.uNotification = uMsg==WM_LBUTTONUP ? DL_DROPPED : DL_CANCELDRAG;
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sNotify.hWnd = hLB;
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sNotify.ptCursor.x = GET_X_LPARAM(lParam);
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sNotify.ptCursor.y = GET_Y_LPARAM(lParam);
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ClientToScreen(hLB, &sNotify.ptCursor);
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SendMessage(hwndParent, uDragListMsg, GetDlgCtrlID(hLB),
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(LPARAM)(LPDRAGLISTINFO)&sNotify);
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/* We need to make sure to return 0 in case this is from a
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* keyboard message.
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*/
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return(0L);
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}
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break;
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case WM_GETDLGCODE:
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if (bDragging)
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{
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return (DefSubclassProc(hLB, uMsg, wParam, lParam) |
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DLGC_WANTMESSAGE);
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}
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break;
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case WM_KEYDOWN:
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if (wParam == VK_ESCAPE)
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{
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SendMessage(hLB, WM_RBUTTONDOWN, 0, 0L);
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}
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// fall through
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case WM_CHAR:
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case WM_KEYUP:
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/* We don't want the listbox processing this if we are dragging.
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*/
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if (bDragging)
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return(0L);
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break;
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default:
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break;
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}
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return(DefSubclassProc(hLB, uMsg, wParam, lParam));
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}
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BOOL WINAPI MakeDragList(HWND hLB)
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{
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PDRAGPROP pDragProp;
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if (!uDragListMsg)
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uDragListMsg = RegisterWindowMessage(szDragListMsgString);
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/* Check that we have not already subclassed this window.
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*/
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if (GetWindowSubclass(hLB, DragListSubclassProc, 0, NULL))
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return(TRUE);
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pDragProp = (PDRAGPROP)LocalAlloc(LPTR, sizeof(DRAGPROP));
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if (!pDragProp)
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return(FALSE);
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if (!SetWindowSubclass(hLB, DragListSubclassProc, 0, (DWORD_PTR)pDragProp))
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{
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LocalFree((HLOCAL)pDragProp);
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return(FALSE);
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}
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return(TRUE);
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}
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int WINAPI LBItemFromPt(HWND hLB, POINT pt, BOOL bAutoScroll)
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{
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static LONG dwLastScroll = 0;
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RECT rc;
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DWORD dwNow;
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int nItem;
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WORD wScrollDelay, wActualDelay;
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ScreenToClient(hLB, &pt);
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GetClientRect(hLB, &rc);
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nItem = (int)SendMessage(hLB, LB_GETTOPINDEX, 0, 0L);
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/* Is the point in the LB client area?
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*/
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if (PtInRect(&rc, pt))
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{
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/* Check each visible item in turn.
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*/
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for ( ; ; ++nItem)
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{
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if (SendMessage(hLB, LB_GETITEMRECT, nItem, (LPARAM)(LPRECT)&rc)
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== LB_ERR)
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break;
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if (PtInRect(&rc, pt))
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return(nItem);
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}
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}
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else
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{
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/* If we want autoscroll and the point is directly above or below the
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* LB, determine the direction and if it is time to scroll yet.
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*/
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if (bAutoScroll && (UINT)pt.x<(UINT)rc.right)
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{
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if (pt.y <= 0)
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{
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--nItem;
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}
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else
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{
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++nItem;
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pt.y = rc.bottom - pt.y;
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}
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wScrollDelay = (WORD)(1000 /
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(INITLINESPERSECOND - pt.y/VERTCHANGENUMLINES));
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dwNow = GetTickCount();
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wActualDelay = (WORD)(dwNow - dwLastScroll);
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if (wActualDelay > wScrollDelay)
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{
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/* This will the actual number of scrolls per second to be
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* much closer to the required number.
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*/
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if (wActualDelay > wScrollDelay * 2)
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dwLastScroll = dwNow;
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else
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dwLastScroll += wScrollDelay;
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SendMessage(hLB, LB_SETTOPINDEX, nItem, 0L);
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}
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}
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}
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return(-1);
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}
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void WINAPI DrawInsert(HWND hwndParent, HWND hLB, int nItem)
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{
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static POINT ptLastInsert;
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static int nLastInsert = -1;
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RECT rc;
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/* Erase the old mark if necessary
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*/
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if (nLastInsert>=0 && nItem!=nLastInsert)
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{
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rc.left = ptLastInsert.x;
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rc.top = ptLastInsert.y;
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rc.right = rc.left + DX_INSERT;
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rc.bottom = rc.top + DY_INSERT;
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/* Need to update immediately in case the insert rects overlap.
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*/
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InvalidateRect(hwndParent, &rc, TRUE);
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UpdateWindow(hwndParent);
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nLastInsert = -1;
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}
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/* Draw a new mark if necessary
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*/
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if (nItem!=nLastInsert && nItem>=0)
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{
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HICON hInsert = NULL;
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if (!hInsert)
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hInsert = LoadIcon(HINST_THISDLL, MAKEINTRESOURCE(IDI_INSERT));
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if (hInsert)
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{
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HDC hDC;
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GetWindowRect(hLB, &rc);
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ScreenToClient(hLB, (LPPOINT)&rc);
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ptLastInsert.x = rc.left - DX_INSERT;
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SendMessage(hLB, LB_GETITEMRECT, nItem, (LPARAM)(LPRECT)&rc);
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ptLastInsert.y = rc.top - DY_INSERT/2;
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nLastInsert = nItem;
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ClientToScreen(hLB, &ptLastInsert);
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ScreenToClient(hwndParent, &ptLastInsert);
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hDC = GetDC(hwndParent);
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DrawIcon(hDC, ptLastInsert.x, ptLastInsert.y, hInsert);
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ReleaseDC(hwndParent, hDC);
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}
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|
|
}
|
||
|
|
}
|