/* * Scroll windows and DCs * * Copyright David W. Metcalfe, 1993 * Alex Korobka 1995 * * */ #include #include "wintypes.h" #include "class.h" #include "win.h" #include "gdi.h" #include "sysmetrics.h" #include "stddebug.h" /* #define DEBUG_SCROLL */ #include "debug.h" extern HRGN DCE_GetVisRgn(HWND, WORD); static int RgnType; /* ----------------------------------------------------------------------- * SCROLL_TraceChildren * * Returns a region invalidated by children, siblings, and/or ansectors * in the window rectangle or client rectangle * * dcx can have DCX_WINDOW, DCX_CLIPCHILDREN, DCX_CLIPSIBLINGS set */ HRGN SCROLL_TraceChildren( HWND hScroll, short dx, short dy, WORD dcx) { WND *wndScroll = WIN_FindWndPtr( hScroll ); HRGN hRgnWnd; HRGN hUpdateRgn,hCombineRgn; if( !wndScroll || ( !dx && !dy) ) return 0; if( dcx & DCX_WINDOW ) hRgnWnd = CreateRectRgnIndirect(&wndScroll->rectWindow); else { RECT rect; GetClientRect(hScroll,&rect); hRgnWnd = CreateRectRgnIndirect(&rect); } hUpdateRgn = DCE_GetVisRgn( hScroll, dcx ); hCombineRgn = CreateRectRgn(0,0,0,0); if( !hUpdateRgn || !hCombineRgn ) { DeleteObject( hUpdateRgn? hUpdateRgn : hCombineRgn); DeleteObject(hRgnWnd); return 0; } OffsetRgn( hUpdateRgn, dx, dy); CombineRgn(hCombineRgn, hRgnWnd, hUpdateRgn, RGN_DIFF); DeleteObject(hRgnWnd); DeleteObject(hUpdateRgn); return hCombineRgn; } /* ---------------------------------------------------------------------- * SCROLL_ScrollChildren */ BOOL SCROLL_ScrollChildren( HWND hScroll, short dx, short dy) { WND *wndPtr = WIN_FindWndPtr(hScroll); HWND hWnd = wndPtr->hwndChild; HRGN hUpdateRgn; BOOL b = 0; if( !wndPtr || ( !dx && !dy )) return 0; dprintf_scroll(stddeb,"SCROLL_ScrollChildren: hwnd "NPFMT" dx=%i dy=%i\n",hScroll,dx,dy); /* get a region in client rect invalidated by siblings and ansectors */ hUpdateRgn = SCROLL_TraceChildren(hScroll, dx , dy, DCX_CLIPSIBLINGS); /* update children coordinates */ while( hWnd ) { wndPtr = WIN_FindWndPtr( hWnd ); /* we can check if window intersects with clipRect parameter * and do not move it if not - just a thought. - AK */ SetWindowPos(hWnd,0,wndPtr->rectWindow.left + dx, wndPtr->rectWindow.top + dy, 0,0, SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOREDRAW | SWP_DEFERERASE ); hWnd = wndPtr->hwndNext; } /* invalidate uncovered region and paint frames */ b = RedrawWindow( hScroll, NULL, hUpdateRgn, RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW | RDW_ALLCHILDREN ); DeleteObject( hUpdateRgn); return b; } /************************************************************************* * ScrollWindow (USER.61) * * FIXME: a bit broken */ void ScrollWindow(HWND hwnd, short dx, short dy, LPRECT rect, LPRECT clipRect) { HDC hdc; HRGN hrgnUpdate,hrgnClip; RECT rc, cliprc; dprintf_scroll(stddeb,"ScrollWindow: dx=%d, dy=%d, lpRect =%08lx clipRect=%i,%i,%i,%i\n", dx, dy, (LONG)rect, (int)((clipRect)?clipRect->left:0), (int)((clipRect)?clipRect->top:0), (int)((clipRect)?clipRect->right:0), (int)((clipRect)?clipRect->bottom:0)); /* if rect is NULL children have to be moved */ if ( !rect ) { GetClientRect(hwnd, &rc); hrgnClip = CreateRectRgnIndirect( &rc ); /* children will be Blt'ed too */ hdc = GetDCEx(hwnd, hrgnClip, DCX_CACHE | DCX_CLIPSIBLINGS); DeleteObject(hrgnClip); } else { GetClientRect(hwnd,&rc); dprintf_scroll(stddeb,"\trect=%i %i %i %i client=%i %i %i %i\n", (int)rect->left,(int)rect->top,(int)rect->right, (int)rect->bottom,(int)rc.left,(int)rc.top, (int)rc.right,(int)rc.bottom); CopyRect(&rc, rect); hdc = GetDC(hwnd); } if (clipRect == NULL) GetClientRect(hwnd, &cliprc); else CopyRect(&cliprc, clipRect); hrgnUpdate = CreateRectRgn(0, 0, 0, 0); ScrollDC(hdc, dx, dy, &rc, &cliprc, hrgnUpdate, NULL); ReleaseDC(hwnd, hdc); if( !rect ) { /* FIXME: this doesn't take into account hrgnUpdate */ if( !SCROLL_ScrollChildren(hwnd,dx,dy) ) InvalidateRgn(hwnd, hrgnUpdate, TRUE); } else { HRGN hrgnInv = SCROLL_TraceChildren(hwnd,dx,dy,DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS ); if( hrgnInv ) { HRGN hrgnCombine = CreateRectRgn(0,0,0,0); CombineRgn(hrgnCombine,hrgnInv,hrgnUpdate,RGN_OR); dprintf_scroll(stddeb,"ScrollWindow: hrgnComb="NPFMT" hrgnInv="NPFMT" hrgnUpd="NPFMT"\n", hrgnCombine,hrgnInv,hrgnUpdate); DeleteObject(hrgnUpdate); DeleteObject(hrgnInv); hrgnUpdate = hrgnCombine; } RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE | RDW_ERASENOW); } DeleteObject(hrgnUpdate); } /************************************************************************* * ScrollDC (USER.221) * * FIXME: half-broken */ BOOL ScrollDC(HDC hdc, short dx, short dy, LPRECT rc, LPRECT cliprc, HRGN hrgnUpdate, LPRECT rcUpdate) { HRGN hrgnClip, hrgn1, hrgn2; POINT src, dest; short width, height; DC *dc = (DC *)GDI_GetObjPtr(hdc, DC_MAGIC); dprintf_scroll(stddeb,"ScrollDC: dx=%d dy=%d, hrgnUpdate="NPFMT" rc=%i %i %i %i\n", dx,dy,hrgnUpdate,(int)((rc)?rc->left:0), (int)((rc)?rc->top:0), (int)((rc)?rc->right:0), (int)((rc)?rc->bottom:0)); if (rc == NULL) return FALSE; if (cliprc) { hrgnClip = CreateRectRgnIndirect(cliprc); SelectClipRgn(hdc, hrgnClip); } if (dx > 0) { src.x = XDPTOLP(dc, rc->left); dest.x = XDPTOLP(dc, rc->left + abs(dx)); } else { src.x = XDPTOLP(dc, rc->left + abs(dx)); dest.x = XDPTOLP(dc, rc->left); } if (dy > 0) { src.y = YDPTOLP(dc, rc->top); dest.y = YDPTOLP(dc, rc->top + abs(dy)); } else { src.y = YDPTOLP(dc, rc->top + abs(dy)); dest.y = YDPTOLP(dc, rc->top); } width = rc->right - rc->left - abs(dx); height = rc->bottom - rc->top - abs(dy); if (!BitBlt(hdc, dest.x, dest.y, width, height, hdc, src.x, src.y, SRCCOPY)) return FALSE; if (hrgnUpdate) { if (dx > 0) hrgn1 = CreateRectRgn(rc->left, rc->top, rc->left+dx, rc->bottom); else if (dx < 0) hrgn1 = CreateRectRgn(rc->right+dx, rc->top, rc->right, rc->bottom); else hrgn1 = CreateRectRgn(0, 0, 0, 0); if (dy > 0) hrgn2 = CreateRectRgn(rc->left, rc->top, rc->right, rc->top+dy); else if (dy < 0) hrgn2 = CreateRectRgn(rc->left, rc->bottom+dy, rc->right, rc->bottom); else hrgn2 = CreateRectRgn(0, 0, 0, 0); RgnType = CombineRgn(hrgnUpdate, hrgn1, hrgn2, RGN_OR); DeleteObject(hrgn1); DeleteObject(hrgn2); } if (rcUpdate) GetRgnBox( hrgnUpdate, rcUpdate ); return TRUE; } /************************************************************************* * ScrollWindowEx (USER.319) * * FIXME: broken * * SCROLL_TraceChildren can help */ int ScrollWindowEx(HWND hwnd, short dx, short dy, LPRECT rect, LPRECT clipRect, HRGN hrgnUpdate, LPRECT rcUpdate, WORD flags) { HDC hdc; RECT rc, cliprc; dprintf_scroll(stddeb,"ScrollWindowEx: dx=%d, dy=%d, wFlags=%04x\n",dx, dy, flags); hdc = GetDC(hwnd); if (rect == NULL) GetClientRect(hwnd, &rc); else CopyRect(&rc, rect); if (clipRect == NULL) GetClientRect(hwnd, &cliprc); else CopyRect(&cliprc, clipRect); ScrollDC(hdc, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate); if (flags | SW_INVALIDATE) { RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE | ((flags & SW_ERASE) ? RDW_ERASENOW : 0)); } ReleaseDC(hwnd, hdc); return RgnType; }