00cb676e11
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2936 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
//
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// "$Id: fl_scroll_area.cxx,v 1.4.2.3.2.4 2003/01/30 21:44:12 easysw Exp $"
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//
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// Scrolling routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2003 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems to "fltk-bugs@fltk.org".
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//
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// Drawing function to move the contents of a rectangle. This is passed
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// a "callback" which is called to draw rectangular areas that are moved
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// into the drawing area.
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#include <FL/x.H>
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// scroll a rectangle and redraw the newly exposed portions:
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void fl_scroll(int X, int Y, int W, int H, int dx, int dy,
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void (*draw_area)(void*, int,int,int,int), void* data)
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{
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if (!dx && !dy) return;
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if (dx <= -W || dx >= W || dy <= -H || dy >= H) {
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// no intersection of old an new scroll
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draw_area(data,X,Y,W,H);
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return;
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}
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int src_x, src_w, dest_x, clip_x, clip_w;
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if (dx > 0) {
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src_x = X;
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dest_x = X+dx;
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src_w = W-dx;
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clip_x = X;
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clip_w = dx;
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} else {
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src_x = X-dx;
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dest_x = X;
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src_w = W+dx;
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clip_x = X+src_w;
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clip_w = W-src_w;
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}
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int src_y, src_h, dest_y, clip_y, clip_h;
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if (dy > 0) {
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src_y = Y;
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dest_y = Y+dy;
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src_h = H-dy;
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clip_y = Y;
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clip_h = dy;
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} else {
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src_y = Y-dy;
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dest_y = Y;
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src_h = H+dy;
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clip_y = Y+src_h;
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clip_h = H-src_h;
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}
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#ifdef WIN32
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BitBlt(fl_gc, dest_x, dest_y, src_w, src_h, fl_gc, src_x, src_y,SRCCOPY);
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// NYI: need to redraw areas that the source of BitBlt was bad due to
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// overlapped windows, probably similar to X version:
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#elif defined(__APPLE__)
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Rect src = { src_y, src_x, src_y+src_h, src_x+src_w };
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Rect dst = { dest_y, dest_x, dest_y+src_h, dest_x+src_w };
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static RGBColor bg = { 0xffff, 0xffff, 0xffff }; RGBBackColor( &bg );
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static RGBColor fg = { 0x0000, 0x0000, 0x0000 }; RGBForeColor( &fg );
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CopyBits( GetPortBitMapForCopyBits( GetWindowPort(fl_window) ),
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GetPortBitMapForCopyBits( GetWindowPort(fl_window) ), &src, &dst, srcCopy, 0L);
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#else
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XCopyArea(fl_display, fl_window, fl_window, fl_gc,
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src_x, src_y, src_w, src_h, dest_x, dest_y);
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// we have to sync the display and get the GraphicsExpose events! (sigh)
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for (;;) {
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XEvent e; XWindowEvent(fl_display, fl_window, ExposureMask, &e);
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if (e.type == NoExpose) break;
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// otherwise assumme it is a GraphicsExpose event:
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draw_area(data, e.xexpose.x, e.xexpose.y,
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e.xexpose.width, e.xexpose.height);
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if (!e.xgraphicsexpose.count) break;
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}
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#endif
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if (dx) draw_area(data, clip_x, dest_y, clip_w, src_h);
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if (dy) draw_area(data, X, clip_y, W, clip_h);
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}
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//
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// End of "$Id: fl_scroll_area.cxx,v 1.4.2.3.2.4 2003/01/30 21:44:12 easysw Exp $".
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//
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