/* * 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); extern HWND CARET_GetHwnd(); 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 = CreateRectRgnIndirect16(&wndScroll->rectWindow); else { RECT32 rect; GetClientRect32(hScroll,&rect); hRgnWnd = CreateRectRgnIndirect32(&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); HRGN hUpdateRgn; BOOL b = 0; if( !wndPtr || ( !dx && !dy )) return 0; dprintf_scroll(stddeb,"SCROLL_ScrollChildren: hwnd %04x 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 */ for (wndPtr = wndPtr->child; wndPtr; wndPtr = wndPtr->next) { /* we can check if window intersects with clipRect parameter * and do not move it if not - just a thought. - AK */ SetWindowPos(wndPtr->hwndSelf, 0, wndPtr->rectWindow.left + dx, wndPtr->rectWindow.top + dy, 0,0, SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOREDRAW | SWP_DEFERERASE ); } /* invalidate uncovered region and paint frames */ b = RedrawWindow32( 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, LPRECT16 rect, LPRECT16 clipRect) { HDC hdc; HRGN hrgnUpdate,hrgnClip; RECT16 rc, cliprc; HWND hCaretWnd = CARET_GetHwnd(); 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 ) { GetClientRect16(hwnd, &rc); hrgnClip = CreateRectRgnIndirect16( &rc ); if ((hCaretWnd == hwnd) || IsChild(hwnd,hCaretWnd)) HideCaret(hCaretWnd); else hCaretWnd = 0; /* children will be Blt'ed too */ hdc = GetDCEx(hwnd, hrgnClip, DCX_CACHE | DCX_CLIPSIBLINGS); DeleteObject(hrgnClip); } else { GetClientRect16(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); if (hCaretWnd == hwnd) HideCaret(hCaretWnd); else hCaretWnd = 0; CopyRect16(&rc, rect); hdc = GetDC(hwnd); } if (clipRect == NULL) GetClientRect16(hwnd, &cliprc); else CopyRect16(&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 ) { CombineRgn(hrgnUpdate,hrgnInv,hrgnUpdate,RGN_OR); DeleteObject(hrgnInv); } RedrawWindow32( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE | RDW_ERASENOW); } DeleteObject(hrgnUpdate); if( hCaretWnd ) ShowCaret(hCaretWnd); } /************************************************************************* * ScrollDC (USER.221) * * FIXME: half-broken */ BOOL ScrollDC(HDC hdc, short dx, short dy, LPRECT16 rc, LPRECT16 cliprc, HRGN hrgnUpdate, LPRECT16 rcUpdate) { HRGN hrgnClip; POINT16 src, dest; short width, height; DC *dc = (DC *)GDI_GetObjPtr(hdc, DC_MAGIC); dprintf_scroll(stddeb,"ScrollDC: dx=%d dy=%d, hrgnUpdate=%04x rcUpdate = %p cliprc = %p, rc=%d %d %d %d\n", dx, dy, hrgnUpdate, rcUpdate, cliprc, rc ? rc->left : 0, rc ? rc->top : 0, rc ? rc->right : 0, rc ? rc->bottom : 0 ); if (rc == NULL) return FALSE; if (!dc) { fprintf(stdnimp,"ScrollDC: Invalid HDC\n"); return FALSE; } if (cliprc) { hrgnClip = CreateRectRgnIndirect16(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) { HRGN hrgn1,hrgn2; 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) GetRgnBox16( hrgnUpdate, rcUpdate ); } else if (rcUpdate) { RECT16 rx,ry; rx = ry = *rc; if( dx > 0 ) rx.right = rc->left+dx; else if (dx < 0) rx.left = rc->right+dx; else SetRectEmpty16( &rx ); if( dy > 0 ) ry.bottom = rc->top+dy; else if (dy < 0) ry.top = rc->bottom+dy; else SetRectEmpty16( &ry ); UnionRect16( rcUpdate, &rx, &ry ); } return TRUE; } /************************************************************************* * ScrollWindowEx (USER.319) * * FIXME: broken * * SCROLL_TraceChildren can help */ int ScrollWindowEx(HWND hwnd, short dx, short dy, LPRECT16 rect, LPRECT16 clipRect, HRGN hrgnUpdate, LPRECT16 rcUpdate, WORD flags) { HDC hdc; RECT16 rc, cliprc; dprintf_scroll(stddeb,"ScrollWindowEx: dx=%d, dy=%d, wFlags=%04x\n",dx, dy, flags); hdc = GetDC(hwnd); if (rect == NULL) GetClientRect16(hwnd, &rc); else CopyRect16(&rc, rect); if (clipRect == NULL) GetClientRect16(hwnd, &cliprc); else CopyRect16(&cliprc, clipRect); ScrollDC(hdc, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate); if (flags | SW_INVALIDATE) { RedrawWindow32( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE | ((flags & SW_ERASE) ? RDW_ERASENOW : 0)); } ReleaseDC(hwnd, hdc); return RgnType; }