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PDFCore.cc
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PDFCore.cc
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//========================================================================
//
// PDFCore.cc
//
// Copyright 2004 Glyph & Cog, LLC
//
// Modified for Debian by Hamish Moffatt, 18 August 2005.
//
//========================================================================
#include <poppler-config.h>
#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
#include <math.h>
#include "poppler/goo/GooString.h"
#include "poppler/goo/GooList.h"
#include "GlobalParamsGUI.h"
#include "poppler/splash/Splash.h"
#include "poppler/splash/SplashBitmap.h"
#include "poppler/splash/SplashPattern.h"
#include "poppler/splash/SplashPath.h"
#include "poppler/Error.h"
#include "poppler/ErrorCodes.h"
#include "poppler/PDFDoc.h"
#include "poppler/Link.h"
#include "poppler/TextOutputDev.h"
#include "CoreOutputDev.h"
#include "PDFCore.h"
//------------------------------------------------------------------------
// PDFCorePage
//------------------------------------------------------------------------
PDFCorePage::PDFCorePage(int pageA, int wA, int hA, int tileWA, int tileHA):
page(pageA), tiles(new GooList()), w(wA), h(hA), tileW(tileWA),
tileH(tileHA), links(NULL), text(NULL)
{}
PDFCorePage::~PDFCorePage()
{
deleteGooList(tiles, PDFCoreTile);
delete links;
if (text) {
text->decRefCnt(); // this will delete text itself
}
}
//------------------------------------------------------------------------
// PDFCoreTile
//------------------------------------------------------------------------
PDFCoreTile::PDFCoreTile(int xDestA, int yDestA):
xMin(0), yMin(0), xMax(0), yMax(0), xDest(xDestA), yDest(yDestA),
bitmap(NULL)
{}
PDFCoreTile::~PDFCoreTile() {
delete bitmap;
}
//------------------------------------------------------------------------
// PDFCore
//------------------------------------------------------------------------
PDFCore::PDFCore(SplashColorMode colorModeA, int bitmapRowPadA,
bool reverseVideoA, SplashColorPtr paperColorA,
bool incrementalUpdate) {
int i;
doc = NULL;
continuousMode = globalParamsGUI->getContinuousView();
drawAreaWidth = drawAreaHeight = 0;
maxPageW = totalDocH = 0;
pageY = NULL;
topPage = 0;
scrollX = scrollY = 0;
zoom = defZoom;
dpi = 0;
rotate = 0;
selectPage = 0;
selectULX = selectLRX = 0;
selectULY = selectLRY = 0;
dragging = false;
lastDragLeft = lastDragTop = true;
historyCur = pdfHistorySize - 1;
historyBLen = historyFLen = 0;
for (i = 0; i < pdfHistorySize; ++i) {
history[i].fileName = NULL;
}
pages = new GooList();
curTile = NULL;
splashColorCopy(paperColor, paperColorA);
out = new CoreOutputDev(colorModeA, bitmapRowPadA,
reverseVideoA, paperColorA, incrementalUpdate,
&redrawCbk, this);
out->startDoc(NULL);
}
PDFCore::~PDFCore() {
int i;
delete doc;
for (i = 0; i < pdfHistorySize; ++i) {
delete history[i].fileName;
}
gfree(pageY);
deleteGooList(pages, PDFCorePage);
delete out;
}
int PDFCore::loadFile(GooString *fileName, GooString *ownerPassword,
GooString *userPassword) {
int err;
setBusyCursor(true);
err = loadFile2(new PDFDoc(fileName->copy(), ownerPassword, userPassword,
this));
setBusyCursor(false);
return err;
}
int PDFCore::loadFile(BaseStream *stream, GooString *ownerPassword,
GooString *userPassword) {
int err;
setBusyCursor(true);
err = loadFile2(new PDFDoc(stream, ownerPassword, userPassword, this));
setBusyCursor(false);
return err;
}
void PDFCore::loadDoc(PDFDoc *docA) {
setBusyCursor(true);
loadFile2(docA);
setBusyCursor(false);
}
int PDFCore::loadFile2(PDFDoc *newDoc) {
int err;
double w, h, t;
int i;
// open the PDF file
if (!newDoc->isOk()) {
err = newDoc->getErrorCode();
delete newDoc;
return err;
}
// replace old document
delete doc;
doc = newDoc;
if (out) {
out->startDoc(doc->getXRef());
}
// nothing displayed yet
topPage = -99;
while (pages->getLength() > 0) {
delete (PDFCorePage *)pages->del(0);
}
// compute the max unscaled page size
maxUnscaledPageW = maxUnscaledPageH = 0;
for (i = 1; i <= doc->getNumPages(); ++i) {
w = doc->getPageCropWidth(i);
h = doc->getPageCropHeight(i);
if (doc->getPageRotate(i) == 90 || doc->getPageRotate(i) == 270) {
t = w; w = h; h = t;
}
if (w > maxUnscaledPageW) {
maxUnscaledPageW = w;
}
if (h > maxUnscaledPageH) {
maxUnscaledPageH = h;
}
}
return errNone;
}
void PDFCore::clear() {
if (!doc) {
return;
}
// no document
delete doc;
doc = NULL;
out->clear();
// no page displayed
topPage = -99;
while (pages->getLength() > 0) {
delete (PDFCorePage *)pages->del(0);
}
// redraw
scrollX = scrollY = 0;
redrawWindow(0, 0, drawAreaWidth, drawAreaHeight, true);
updateScrollbars();
}
PDFDoc *PDFCore::takeDoc(bool redraw) {
PDFDoc *docA;
if (!doc) {
return NULL;
}
// no document
docA = doc;
doc = NULL;
out->clear();
// no page displayed
topPage = -99;
while (pages->getLength() > 0) {
delete (PDFCorePage *)pages->del(0);
}
// redraw
scrollX = scrollY = 0;
if (redraw) {
redrawWindow(0, 0, drawAreaWidth, drawAreaHeight, true);
updateScrollbars();
}
return docA;
}
void PDFCore::displayPage(int topPageA, double zoomA, int rotateA,
bool scrollToTop, bool addToHist) {
int scrollXA, scrollYA;
scrollXA = scrollX;
if (continuousMode) {
scrollYA = -1;
} else if (scrollToTop) {
scrollYA = 0;
} else {
scrollYA = scrollY;
}
if (zoomA != zoom) {
scrollXA = 0;
scrollYA = continuousMode ? -1 : 0;
}
dragging = false;
lastDragLeft = lastDragTop = true;
update(topPageA, scrollXA, scrollYA, zoomA, rotateA, true, addToHist);
}
void PDFCore::displayDest(LinkDest *dest, double zoomA, int rotateA,
bool addToHist) {
Ref pageRef;
int topPageA;
int dx, dy, scrollXA, scrollYA;
if (dest->isPageRef()) {
pageRef = dest->getPageRef();
topPageA = doc->findPage(pageRef.num, pageRef.gen);
} else {
topPageA = dest->getPageNum();
}
if (topPageA <= 0 || topPageA > doc->getNumPages()) {
topPageA = 1;
}
scrollXA = scrollX;
scrollYA = continuousMode ? -1 : scrollY;
switch (dest->getKind()) {
case destXYZ:
cvtUserToDev(topPageA, dest->getLeft(), dest->getTop(), &dx, &dy);
scrollXA = dest->getChangeLeft() ? dx : scrollX;
if (dest->getChangeTop()) {
scrollYA = dy;
} else {
if (topPage <= 0) {
scrollYA = 0;
} else if (continuousMode) {
scrollYA = scrollY - pageY[topPage - 1];
} else {
scrollYA = scrollY;
}
}
if (continuousMode && topPage > 0) {
scrollYA += pageY[topPageA - 1];
}
//~ what is the zoom parameter?
break;
case destFit:
case destFitB:
//~ do fit
scrollXA = 0;
scrollYA = continuousMode ? -1 : 0;
break;
case destFitH:
case destFitBH:
//~ do fit
cvtUserToDev(topPageA, 0, dest->getTop(), &dx, &dy);
if (continuousMode && topPage > 0) {
dy += pageY[topPageA - 1];
}
scrollXA = 0;
scrollYA = dy;
break;
case destFitV:
case destFitBV:
//~ do fit
cvtUserToDev(topPageA, dest->getLeft(), 0, &dx, &dy);
scrollXA = dx;
scrollYA = continuousMode ? -1 : 0;
break;
case destFitR:
//~ do fit
cvtUserToDev(topPageA, dest->getLeft(), dest->getTop(), &dx, &dy);
if (continuousMode && topPage > 0) {
dy += pageY[topPageA - 1];
}
scrollXA = dx;
scrollYA = dy;
break;
}
update(topPageA, scrollXA, scrollYA, zoom, rotate, false,
addToHist && topPageA != topPage);
}
void PDFCore::update(int topPageA, int scrollXA, int scrollYA,
double zoomA, int rotateA, bool force, bool addToHist) {
double hDPI, vDPI, dpiA, uw, uh, ut;
int w, h, t, x0, x1, y0, y1, x, y;
int rot;
int pg0, pg1;
PDFCoreTile *tile;
PDFCorePage *page;
PDFHistory *hist;
SplashColor xorColor;
bool needUpdate;
int i, j;
// check for document and valid page number
if (!doc) {
// save the new settings
zoom = zoomA;
rotate = rotateA;
return;
}
if (topPageA <= 0 || topPageA > doc->getNumPages()) {
return;
}
needUpdate = false;
// check for changes to the PDF file
if ((force || (!continuousMode && topPage != topPageA)) &&
checkForNewFile()) {
if (loadFile(doc->getFileName()) == errNone) {
if (topPageA > doc->getNumPages()) {
topPageA = doc->getNumPages();
}
needUpdate = true;
}
}
// compute the DPI
if (continuousMode) {
uw = maxUnscaledPageW;
uh = maxUnscaledPageH;
rot = rotateA;
} else {
uw = doc->getPageCropWidth(topPageA);
uh = doc->getPageCropHeight(topPageA);
rot = rotateA + doc->getPageRotate(topPageA);
if (rot >= 360) {
rot -= 360;
} else if (rot < 0) {
rot += 360;
}
}
if (rot == 90 || rot == 270) {
ut = uw; uw = uh; uh = ut;
}
if (zoomA == zoomPage) {
hDPI = (drawAreaWidth / uw) * 72;
if (continuousMode) {
vDPI = ((drawAreaHeight - continuousModePageSpacing) / uh) * 72;
} else {
vDPI = (drawAreaHeight / uh) * 72;
}
dpiA = (hDPI < vDPI) ? hDPI : vDPI;
} else if (zoomA == zoomWidth) {
dpiA = (drawAreaWidth / uw) * 72;
} else {
dpiA = 0.01 * zoomA * 72;
}
// this can happen if the window hasn't been sized yet
if (dpiA <= 0) {
dpiA = 1;
}
// if the display properties have changed, create a new PDFCorePage
// object
if (force || pages->getLength() == 0 ||
(!continuousMode && topPageA != topPage) ||
zoomA != zoom || fabs( dpiA - dpi ) > EPSILON || rotateA != rotate) {
needUpdate = true;
setSelection(0, 0, 0, 0, 0);
while (pages->getLength() > 0) {
delete (PDFCorePage *)pages->del(0);
}
zoom = zoomA;
rotate = rotateA;
dpi = dpiA;
if (continuousMode) {
maxPageW = totalDocH = 0;
pageY = (int *)greallocn(pageY, doc->getNumPages(), sizeof(int));
for (i = 1; i <= doc->getNumPages(); ++i) {
pageY[i-1] = totalDocH;
w = (int)((doc->getPageCropWidth(i) * dpi) / 72 + 0.5);
h = (int)((doc->getPageCropHeight(i) * dpi) / 72 + 0.5);
rot = rotate + doc->getPageRotate(i);
if (rot >= 360) {
rot -= 360;
} else if (rot < 0) {
rot += 360;
}
if (rot == 90 || rot == 270) {
t = w; w = h; h = t;
}
if (w > maxPageW) {
maxPageW = w;
}
totalDocH += h;
if (i < doc->getNumPages()) {
totalDocH += continuousModePageSpacing;
}
}
} else {
rot = rotate + doc->getPageRotate(topPageA);
if (rot >= 360) {
rot -= 360;
} else if (rot < 0) {
rot += 360;
}
addPage(topPageA, rot);
}
} else {
// erase the selection
if (selectULX != selectLRX && selectULY != selectLRY) {
xorColor[0] = xorColor[1] = xorColor[2] = 0xff;
xorRectangle(selectPage, selectULX, selectULY, selectLRX, selectLRY,
new SplashSolidColor(xorColor));
}
}
if (continuousMode) {
page = NULL; // make gcc happy
} else {
page = (PDFCorePage *)pages->get(0);
}
topPage = topPageA;
// adjust the scroll position
scrollX = scrollXA;
if (continuousMode && scrollYA < 0) {
scrollY = pageY[topPage - 1];
} else {
scrollY = scrollYA;
}
w = continuousMode ? maxPageW : page->w;
if (scrollX > w - drawAreaWidth) {
scrollX = w - drawAreaWidth;
}
if (scrollX < 0) {
scrollX = 0;
}
h = continuousMode ? totalDocH : page->h;
if (scrollY > h - drawAreaHeight) {
scrollY = h - drawAreaHeight;
}
if (scrollY < 0) {
scrollY = 0;
}
// find topPage, and the first and last pages to be rasterized
if (continuousMode) {
//~ should use a binary search
for (i = 2; i <= doc->getNumPages(); ++i) {
if (pageY[i-1] > scrollY - drawAreaHeight / 2) {
break;
}
}
pg0 = i - 1;
for (i = pg0 + 1; i <= doc->getNumPages(); ++i) {
if (pageY[i-1] > scrollY) {
break;
}
}
topPage = i - 1;
for (i = topPage + 1; i <= doc->getNumPages(); ++i) {
if (pageY[i-1] > scrollY + drawAreaHeight + drawAreaHeight / 2) {
break;
}
}
pg1 = i - 1;
// delete pages that are no longer needed and insert new pages
// objects that are needed
while (pages->getLength() > 0 &&
((PDFCorePage *)pages->get(0))->page < pg0) {
delete (PDFCorePage *)pages->del(0);
}
i = pages->getLength() - 1;
while (i > 0 && ((PDFCorePage *)pages->get(i))->page > pg1) {
delete (PDFCorePage *)pages->del(i--);
}
j = pages->getLength() > 0 ? ((PDFCorePage *)pages->get(0))->page - 1
: pg1;
for (i = pg0; i <= j; ++i) {
rot = rotate + doc->getPageRotate(i);
if (rot >= 360) {
rot -= 360;
} else if (rot < 0) {
rot += 360;
}
addPage(i, rot);
}
j = ((PDFCorePage *)pages->get(pages->getLength() - 1))->page;
for (i = j + 1; i <= pg1; ++i) {
rot = rotate + doc->getPageRotate(i);
if (rot >= 360) {
rot -= 360;
} else if (rot < 0) {
rot += 360;
}
addPage(i, rot);
}
} else {
pg0 = pg1 = topPage;
}
// delete tiles that are no longer needed
for (i = 0; i < pages->getLength(); ++i) {
page = (PDFCorePage *)pages->get(i);
j = 0;
while (j < page->tiles->getLength()) {
tile = (PDFCoreTile *)page->tiles->get(j);
if (continuousMode) {
y0 = pageY[page->page - 1] + tile->yMin;
y1 = pageY[page->page - 1] + tile->yMax;
} else {
y0 = tile->yMin;
y1 = tile->yMax;
}
if (tile->xMax < scrollX - drawAreaWidth / 2 ||
tile->xMin > scrollX + drawAreaWidth + drawAreaWidth / 2 ||
y1 < scrollY - drawAreaHeight / 2 ||
y0 > scrollY + drawAreaHeight + drawAreaHeight / 2) {
delete (PDFCoreTile *)page->tiles->del(j);
} else {
++j;
}
}
}
// update page positions
for (i = 0; i < pages->getLength(); ++i) {
page = (PDFCorePage *)pages->get(i);
page->xDest = -scrollX;
if (continuousMode) {
page->yDest = pageY[page->page - 1] - scrollY;
} else {
page->yDest = -scrollY;
}
if (continuousMode) {
if (page->w < maxPageW) {
page->xDest += (maxPageW - page->w) / 2;
}
if (maxPageW < drawAreaWidth) {
page->xDest += (drawAreaWidth - maxPageW) / 2;
}
} else if (page->w < drawAreaWidth) {
page->xDest += (drawAreaWidth - page->w) / 2;
}
if (continuousMode && totalDocH < drawAreaHeight) {
page->yDest += (drawAreaHeight - totalDocH) / 2;
} else if (!continuousMode && page->h < drawAreaHeight) {
page->yDest += (drawAreaHeight - page->h) / 2;
}
}
// rasterize any new tiles
for (i = 0; i < pages->getLength(); ++i) {
page = (PDFCorePage *)pages->get(i);
x0 = page->xDest;
x1 = x0 + page->w - 1;
if (x0 < -drawAreaWidth / 2) {
x0 = -drawAreaWidth / 2;
}
if (x1 > drawAreaWidth + drawAreaWidth / 2) {
x1 = drawAreaWidth + drawAreaWidth / 2;
}
x0 = ((x0 - page->xDest) / page->tileW) * page->tileW;
x1 = ((x1 - page->xDest) / page->tileW) * page->tileW;
y0 = page->yDest;
y1 = y0 + page->h - 1;
if (y0 < -drawAreaHeight / 2) {
y0 = -drawAreaHeight / 2;
}
if (y1 > drawAreaHeight + drawAreaHeight / 2) {
y1 = drawAreaHeight + drawAreaHeight / 2;
}
y0 = ((y0 - page->yDest) / page->tileH) * page->tileH;
y1 = ((y1 - page->yDest) / page->tileH) * page->tileH;
for (y = y0; y <= y1; y += page->tileH) {
for (x = x0; x <= x1; x += page->tileW) {
needTile(page, x, y);
}
}
}
// update tile positions
for (i = 0; i < pages->getLength(); ++i) {
page = (PDFCorePage *)pages->get(i);
for (j = 0; j < page->tiles->getLength(); ++j) {
tile = (PDFCoreTile *)page->tiles->get(j);
tile->xDest = tile->xMin - scrollX;
if (continuousMode) {
tile->yDest = tile->yMin + pageY[page->page - 1] - scrollY;
} else {
tile->yDest = tile->yMin - scrollY;
}
if (continuousMode) {
if (page->w < maxPageW) {
tile->xDest += (maxPageW - page->w) / 2;
}
if (maxPageW < drawAreaWidth) {
tile->xDest += (drawAreaWidth - maxPageW) / 2;
}
} else if (page->w < drawAreaWidth) {
tile->xDest += (drawAreaWidth - page->w) / 2;
}
if (continuousMode && totalDocH < drawAreaHeight) {
tile->yDest += (drawAreaHeight - totalDocH) / 2;
} else if (!continuousMode && page->h < drawAreaHeight) {
tile->yDest += (drawAreaHeight - page->h) / 2;
}
}
}
// redraw the selection
if (selectULX != selectLRX && selectULY != selectLRY) {
xorColor[0] = xorColor[1] = xorColor[2] = 0xff;
xorRectangle(selectPage, selectULX, selectULY, selectLRX, selectLRY,
new SplashSolidColor(xorColor));
}
// redraw the window
redrawWindow(0, 0, drawAreaWidth, drawAreaHeight, needUpdate);
updateScrollbars();
// add to history
if (addToHist) {
if (++historyCur == pdfHistorySize) {
historyCur = 0;
}
hist = &history[historyCur];
delete hist->fileName;
if (doc->getFileName()) {
hist->fileName = doc->getFileName()->copy();
} else {
hist->fileName = NULL;
}
hist->page = topPage;
if (historyBLen < pdfHistorySize) {
++historyBLen;
}
historyFLen = 0;
}
}
void PDFCore::addPage(int pg, int rot) {
PDFCorePage *page;
int w, h, t, tileW, tileH, i;
w = (int)((doc->getPageCropWidth(pg) * dpi) / 72 + 0.5);
h = (int)((doc->getPageCropHeight(pg) * dpi) / 72 + 0.5);
if (rot == 90 || rot == 270) {
t = w; w = h; h = t;
}
tileW = 2 * drawAreaWidth;
if (tileW < 1500) {
tileW = 1500;
}
if (tileW > w) {
tileW = w;
}
tileH = 2 * drawAreaHeight;
if (tileH < 1500) {
tileH = 1500;
}
if (tileH > h) {
tileH = h;
}
page = new PDFCorePage(pg, w, h, tileW, tileH);
for (i = 0;
i < pages->getLength() && pg > ((PDFCorePage *)pages->get(i))->page;
++i) ;
pages->insert(i, page);
}
void PDFCore::needTile(PDFCorePage *page, int x, int y) {
PDFCoreTile *tile;
TextOutputDev *textOut;
int xDest, yDest, sliceW, sliceH;
int i;
for (i = 0; i < page->tiles->getLength(); ++i) {
tile = (PDFCoreTile *)page->tiles->get(i);
if (x == tile->xMin && y == tile->yMin) {
return;
}
}
setBusyCursor(true);
sliceW = page->tileW;
if (x + sliceW > page->w) {
sliceW = page->w - x;
}
sliceH = page->tileH;
if (y + sliceH > page->h) {
sliceH = page->h - y;
}
xDest = x - scrollX;
if (continuousMode) {
yDest = y + pageY[page->page - 1] - scrollY;
} else {
yDest = y - scrollY;
}
if (continuousMode) {
if (page->w < maxPageW) {
xDest += (maxPageW - page->w) / 2;
}
if (maxPageW < drawAreaWidth) {
xDest += (drawAreaWidth - maxPageW) / 2;
}
} else if (page->w < drawAreaWidth) {
xDest += (drawAreaWidth - page->w) / 2;
}
if (continuousMode && totalDocH < drawAreaHeight) {
yDest += (drawAreaHeight - totalDocH) / 2;
} else if (!continuousMode && page->h < drawAreaHeight) {
yDest += (drawAreaHeight - page->h) / 2;
}
curTile = tile = newTile(xDest, yDest);
curPage = page;
tile->xMin = x;
tile->yMin = y;
tile->xMax = x + sliceW;
tile->yMax = y + sliceH;
tile->edges = 0;
if (tile->xMin == 0) {
tile->edges |= pdfCoreTileLeftEdge;
}
if (tile->xMax == page->w) {
tile->edges |= pdfCoreTileRightEdge;
}
if (continuousMode) {
if (tile->yMin == 0) {
tile->edges |= pdfCoreTileTopSpace;
if (page->page == 1) {
tile->edges |= pdfCoreTileTopEdge;
}
}
if (tile->yMax == page->h) {
tile->edges |= pdfCoreTileBottomSpace;
if (page->page == doc->getNumPages()) {
tile->edges |= pdfCoreTileBottomEdge;
}
}
} else {
if (tile->yMin == 0) {
tile->edges |= pdfCoreTileTopEdge;
}
if (tile->yMax == page->h) {
tile->edges |= pdfCoreTileBottomEdge;
}
}
doc->displayPageSlice(out, page->page, dpi, dpi, rotate,
false, true, false, x, y, sliceW, sliceH);
tile->bitmap = out->takeBitmap();
memcpy(tile->ctm, out->getDefCTM(), 6 * sizeof(double));
memcpy(tile->ictm, out->getDefICTM(), 6 * sizeof(double));
if (!page->links) {
page->links = doc->getLinks(page->page);
}
if (!page->text) {
if ((textOut = new TextOutputDev(NULL, true, false, false))) {
doc->displayPage(textOut, page->page, dpi, dpi, rotate,
false, true, false);
page->text = textOut->takeText();
delete textOut;
}
}
page->tiles->append(tile);
curTile = NULL;
curPage = NULL;
setBusyCursor(false);
}
bool PDFCore::gotoNextPage(int inc, bool top) {
int pg, scrollYA;
if (!doc || doc->getNumPages() == 0 || topPage >= doc->getNumPages()) {
return false;
}
if ((pg = topPage + inc) > doc->getNumPages()) {
pg = doc->getNumPages();
}
if (continuousMode) {
scrollYA = -1;
} else if (top) {
scrollYA = 0;
} else {
scrollYA = scrollY;
}
update(pg, scrollX, scrollYA, zoom, rotate, false, true);
return true;
}
bool PDFCore::gotoPrevPage(int dec, bool top, bool bottom) {
int pg, scrollYA;
if (!doc || doc->getNumPages() == 0 || topPage <= 1) {
return false;
}
if ((pg = topPage - dec) < 1) {
pg = 1;
}
if (continuousMode) {
scrollYA = -1;
} else if (top) {
scrollYA = 0;
} else if (bottom) {
scrollYA = ((PDFCorePage *)pages->get(0))->h - drawAreaHeight;
if (scrollYA < 0) {
scrollYA = 0;
}
} else {
scrollYA = scrollY;
}
update(pg, scrollX, scrollYA, zoom, rotate, false, true);
return true;
}
bool PDFCore::gotoNamedDestination(GooString *dest) {
LinkDest *d;
if (!doc) {
return false;
}
if (!(d = doc->findDest(dest))) {
return false;
}
displayDest(d, zoom, rotate, true);
delete d;
return true;
}
bool PDFCore::goForward() {
int pg;
if (historyFLen == 0) {
return false;
}
if (++historyCur == pdfHistorySize) {
historyCur = 0;
}
--historyFLen;
++historyBLen;
if (!doc || history[historyCur].fileName->cmp(doc->getFileName()) != 0) {
if (loadFile(history[historyCur].fileName) != errNone) {
return false;
}
}
pg = history[historyCur].page;
update(pg, scrollX, continuousMode ? -1 : scrollY,
zoom, rotate, false, false);
return true;
}
bool PDFCore::goBackward() {
int pg;
if (historyBLen <= 1) {
return false;
}
if (--historyCur < 0) {
historyCur = pdfHistorySize - 1;
}
--historyBLen;
++historyFLen;
if (!doc || history[historyCur].fileName->cmp(doc->getFileName()) != 0) {
if (loadFile(history[historyCur].fileName) != errNone) {
return false;
}
}
pg = history[historyCur].page;
update(pg, scrollX, continuousMode ? -1 : scrollY,
zoom, rotate, false, false);
return true;
}
void PDFCore::scrollLeft(int nCols) {
scrollTo(scrollX - nCols, scrollY);
}
void PDFCore::scrollRight(int nCols) {
scrollTo(scrollX + nCols, scrollY);
}
void PDFCore::scrollUp(int nLines) {
scrollTo(scrollX, scrollY - nLines);
}
void PDFCore::scrollUpPrevPage(int nLines) {
if (!continuousMode && scrollY == 0) {
gotoPrevPage(1, false, true);
} else {
scrollTo(scrollX, scrollY - nLines);
}
}
void PDFCore::scrollDown(int nLines) {
scrollTo(scrollX, scrollY + nLines);
}
void PDFCore::scrollDownNextPage(int nLines) {
if (!continuousMode &&
scrollY >= ((PDFCorePage *)pages->get(0))->h - drawAreaHeight) {
gotoNextPage(1, true);
} else {
scrollTo(scrollX, scrollY + nLines);
}
}
void PDFCore::scrollPageUp() {
if (!continuousMode && scrollY == 0) {
gotoPrevPage(1, false, true);
} else {
scrollTo(scrollX, scrollY - drawAreaHeight);
}
}
void PDFCore::scrollPageDown() {
if (!continuousMode &&
scrollY >= ((PDFCorePage *)pages->get(0))->h - drawAreaHeight) {
gotoNextPage(1, true);
} else {
scrollTo(scrollX, scrollY + drawAreaHeight);
}
}
void PDFCore::scrollTo(int x, int y) {
update(topPage, x, y < 0 ? 0 : y, zoom, rotate, false, false);
}
void PDFCore::scrollToLeftEdge() {
update(topPage, 0, scrollY, zoom, rotate, false, false);
}
void PDFCore::scrollToRightEdge() {
PDFCorePage *page;
page = (PDFCorePage *)pages->get(0);
update(topPage, page->w - drawAreaWidth, scrollY,
zoom, rotate, false, false);
}
void PDFCore::scrollToTopEdge() {
int y;
y = continuousMode ? pageY[topPage - 1] : 0;
update(topPage, scrollX, y, zoom, rotate, false, false);
}