gecko-dev/lib/xlate/tblprint.c
1998-03-28 02:44:41 +00:00

215 lines
5.4 KiB
C

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
** This file contains a couple of routines which might be useful
** in a cross platform way for dealing with the calculations
** involved in table printing.
*/
#include "xlate_i.h"
PRIVATE XP_Bool
too_big(MWContext* cx, int size)
{
return size >= (cx->prInfo->page_height/8)*7;
}
/*
** Called by the FE_Display* functions with the Y span of the item to be
** displayed. Used to find page breaks and to reject items which are
** not on the current page.
**
** Returns:
** TRUE means display the item
** FALSE means do not display the item
**
** Requires:
** cx->prInfo to point to a record which contains the following
** information:
**
** page_topy: DOC Y coord of top of this page.
** page_break: During layout, initialize this to
** page_topy+page_height;
** page_height: The physical height of a piece of paper,
** minus top and bottom margins.
** phase: XL_<mumble>_PHASE
**
** If invoked with XP_LayoutForPrint and XP_DrawForPrint, this
** will be done automatically.
*/
PUBLIC XP_Bool
XP_CheckElementSpan(MWContext*cx, int top, int height)
{
int bottom;
/*
** During load phase, or if this doesn't appear to be a print
** related call, we do nothing.
*/
if (cx->prInfo == NULL || cx->prInfo->phase == 0)
return TRUE;
if (cx->prInfo->phase == XL_LOADING_PHASE)
return FALSE;
bottom = top + height - 1;
/*
** Layout phase is used purely to compute the page breaks for each page.
** we always return FALSE, but look carefully at items which span the
** page boundry and pick for the actual page break the y minimum of
** "acceptable" items which span the physical page boundry.
*/
if (cx->prInfo->phase == XL_LAYOUT_PHASE)
{
if (!too_big(cx, height)
&& top >= cx->prInfo->page_topy
&& top < cx->prInfo->page_topy + cx->prInfo->page_height
&& bottom >= cx->prInfo->page_topy + cx->prInfo->page_height)
{
/*
** This item won't fit on this page, and is small enough to consider
** breaking a page for.
*/
if (top < cx->prInfo->page_break) {
cx->prInfo->page_break = top;
}
}
return FALSE;
}
/*
** Which leaves only the actual generation phase.
*/
/*
** Trivial reject of items which aren't on the page at all
*/
if (bottom < cx->prInfo->page_topy || top > cx->prInfo->page_break) {
return FALSE;
}
/*
** Complete acceptance of items which fall entirely on the current page
*/
if (top >= cx->prInfo->page_topy && bottom <= cx->prInfo->page_break) {
return TRUE;
}
/*
** Also print items which overhang the soft boundry, but not the hard
** page boundry.
*/
if (bottom < cx->prInfo->page_topy + cx->prInfo->page_height)
{
return TRUE;
}
/*
** It straddles the page break. If it's big, then print it, and let it
** get chopped off. If it is small, it will display on the next page.
*/
return too_big(cx, height);
}
/*
** Call to set up the page counting fields in the printinfo structure
*/
PUBLIC void
XP_InitializePrintInfo(MWContext *cx)
{
if (cx->prInfo == NULL) {
PrintInfo *p;
p = XP_NEW_ZAP(PrintInfo);
if (!p) return;
cx->prInfo = p;
}
cx->prInfo->n_pages = 0;
cx->prInfo->phase = XL_DRAW_PHASE;
}
PUBLIC void
XP_CleanupPrintInfo(MWContext *cx)
{
PrintInfo *p = cx->prInfo;
if (p) {
if (p->pages) {
free(p->pages);
p->pages = NULL;
}
free(p);
cx->prInfo = NULL;
}
}
PUBLIC void
XP_LayoutForPrint(MWContext *cx, int32 doc_height)
{
int32 y;
int saveit;
saveit = cx->prInfo->phase;
cx->prInfo->phase = XL_LAYOUT_PHASE;
y = 0;
while (y < doc_height) {
cx->prInfo->page_topy = y;
cx->prInfo->page_break = y + cx->prInfo->page_height;
LO_RefreshArea(cx, 0, y,
cx->prInfo->page_width, cx->prInfo->page_height);
if (cx->prInfo->n_pages >= cx->prInfo->pt_size) {
cx->prInfo->pt_size += 100;
cx->prInfo->pages = (PageBreaks*)realloc(
cx->prInfo->pages,
cx->prInfo->pt_size * sizeof (PageBreaks));
if ( !cx->prInfo->pages )
{
extern int MK_OUT_OF_MEMORY;
cx->prInfo->n_pages = MK_OUT_OF_MEMORY;
return;
}
}
cx->prInfo->pages[cx->prInfo->n_pages].y_top = y;
cx->prInfo->pages[cx->prInfo->n_pages].y_break = cx->prInfo->page_break-1;
cx->prInfo->n_pages++;
y = cx->prInfo->page_break;
}
cx->prInfo->phase = saveit;
}
PUBLIC void
XP_DrawForPrint(MWContext *cx, int page)
{
int32 t;
int saveit;
saveit = cx->prInfo->phase;
cx->prInfo->phase = XL_DRAW_PHASE;
t = cx->prInfo->pages[page].y_top;
cx->prInfo->page_topy = t;
cx->prInfo->page_break = cx->prInfo->pages[page].y_break;
LO_RefreshArea(cx,
0, t,
cx->prInfo->page_width, cx->prInfo->page_height);
cx->prInfo->phase = saveit;
}