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26331fc17cbe776704d94cee46c605aa41ab78dc
konsole/src/Screen.cpp
Jekyll Wu 26331fc17c assert ==> Q_ASSERT
2012-03-01 19:30:56 +08:00

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/*
This file is part of Konsole, an X terminal.
Copyright 2007-2008 by Robert Knight <robert.knight@gmail.com>
Copyright 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
// Own
#include "Screen.h"
// Standard
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
// Qt
#include <QtCore/QTextStream>
// Konsole
#include "konsole_wcwidth.h"
#include "TerminalCharacterDecoder.h"
#include "History.h"
using namespace Konsole;
//FIXME: this is emulation specific. Use false for xterm, true for ANSI.
//FIXME: see if we can get this from terminfo.
const bool BS_CLEARS = false ;
//Macro to convert x,y position on screen to position within an image.
//
//Originally the image was stored as one large contiguous block of
//memory, so a position within the image could be represented as an
//offset from the beginning of the block. For efficiency reasons this
//is no longer the case.
//Many internal parts of this class still use this representation for parameters and so on,
//notably moveImage() and clearImage().
//This macro converts from an X,Y position into an image offset.
#ifndef loc
#define loc(X,Y) ((Y)*columns+(X))
#endif
const Character Screen::defaultChar = Character(' ',
CharacterColor(COLOR_SPACE_DEFAULT, DEFAULT_FORE_COLOR),
CharacterColor(COLOR_SPACE_DEFAULT, DEFAULT_BACK_COLOR),
DEFAULT_RENDITION,
false);
Screen::Screen(int l, int c):
lines(l),
columns(c),
screenLines(new ImageLine[lines + 1]),
_scrolledLines(0),
_droppedLines(0),
history(new HistoryScrollNone()),
cuX(0), cuY(0),
currentRendition(0),
_topMargin(0), _bottomMargin(0),
selBegin(0), selTopLeft(0), selBottomRight(0),
blockSelectionMode(false),
effectiveForeground(CharacterColor()), effectiveBackground(CharacterColor()), effectiveRendition(0),
lastPos(-1)
{
lineProperties.resize(lines + 1);
for (int i = 0; i < lines + 1; i++)
lineProperties[i] = LINE_DEFAULT;
initTabStops();
clearSelection();
reset();
}
Screen::~Screen()
{
delete[] screenLines;
delete history;
}
void Screen::cursorUp(int n)
//=CUU
{
if (n == 0) n = 1; // Default
int stop = cuY < _topMargin ? 0 : _topMargin;
cuX = qMin(columns - 1, cuX); // nowrap!
cuY = qMax(stop, cuY - n);
}
void Screen::cursorDown(int n)
//=CUD
{
if (n == 0) n = 1; // Default
int stop = cuY > _bottomMargin ? lines - 1 : _bottomMargin;
cuX = qMin(columns - 1, cuX); // nowrap!
cuY = qMin(stop, cuY + n);
}
void Screen::cursorLeft(int n)
//=CUB
{
if (n == 0) n = 1; // Default
cuX = qMin(columns - 1, cuX); // nowrap!
cuX = qMax(0, cuX - n);
}
void Screen::cursorRight(int n)
//=CUF
{
if (n == 0) n = 1; // Default
cuX = qMin(columns - 1, cuX + n);
}
void Screen::setMargins(int top, int bot)
//=STBM
{
if (top == 0) top = 1; // Default
if (bot == 0) bot = lines; // Default
top = top - 1; // Adjust to internal lineno
bot = bot - 1; // Adjust to internal lineno
if (!(0 <= top && top < bot && bot < lines)) {
//Debug()<<" setRegion("<<top<<","<<bot<<") : bad range.";
return; // Default error action: ignore
}
_topMargin = top;
_bottomMargin = bot;
cuX = 0;
cuY = getMode(MODE_Origin) ? top : 0;
}
int Screen::topMargin() const
{
return _topMargin;
}
int Screen::bottomMargin() const
{
return _bottomMargin;
}
void Screen::index()
//=IND
{
if (cuY == _bottomMargin)
scrollUp(1);
else if (cuY < lines - 1)
cuY += 1;
}
void Screen::reverseIndex()
//=RI
{
if (cuY == _topMargin)
scrollDown(_topMargin, 1);
else if (cuY > 0)
cuY -= 1;
}
void Screen::nextLine()
//=NEL
{
toStartOfLine(); index();
}
void Screen::eraseChars(int n)
{
if (n == 0) n = 1; // Default
int p = qMax(0, qMin(cuX + n - 1, columns - 1));
clearImage(loc(cuX, cuY), loc(p, cuY), ' ');
}
void Screen::deleteChars(int n)
{
Q_ASSERT(n >= 0);
// always delete at least one char
if (n == 0)
n = 1;
// if cursor is beyond the end of the line there is nothing to do
if (cuX >= screenLines[cuY].count())
return;
if (cuX + n > screenLines[cuY].count())
n = screenLines[cuY].count() - cuX;
Q_ASSERT(n >= 0);
Q_ASSERT(cuX + n <= screenLines[cuY].count());
screenLines[cuY].remove(cuX, n);
}
void Screen::insertChars(int n)
{
if (n == 0) n = 1; // Default
if (screenLines[cuY].size() < cuX)
screenLines[cuY].resize(cuX);
screenLines[cuY].insert(cuX, n, Character(' '));
if (screenLines[cuY].count() > columns)
screenLines[cuY].resize(columns);
}
void Screen::deleteLines(int n)
{
if (n == 0) n = 1; // Default
scrollUp(cuY, n);
}
void Screen::insertLines(int n)
{
if (n == 0) n = 1; // Default
scrollDown(cuY, n);
}
void Screen::setMode(int m)
{
currentModes[m] = true;
switch (m) {
case MODE_Origin : cuX = 0; cuY = _topMargin; break; //FIXME: home
}
}
void Screen::resetMode(int m)
{
currentModes[m] = false;
switch (m) {
case MODE_Origin : cuX = 0; cuY = 0; break; //FIXME: home
}
}
void Screen::saveMode(int m)
{
savedModes[m] = currentModes[m];
}
void Screen::restoreMode(int m)
{
currentModes[m] = savedModes[m];
}
bool Screen::getMode(int m) const
{
return currentModes[m];
}
void Screen::saveCursor()
{
savedState.cursorColumn = cuX;
savedState.cursorLine = cuY;
savedState.rendition = currentRendition;
savedState.foreground = currentForeground;
savedState.background = currentBackground;
}
void Screen::restoreCursor()
{
cuX = qMin(savedState.cursorColumn, columns - 1);
cuY = qMin(savedState.cursorLine, lines - 1);
currentRendition = savedState.rendition;
currentForeground = savedState.foreground;
currentBackground = savedState.background;
updateEffectiveRendition();
}
void Screen::resizeImage(int new_lines, int new_columns)
{
if ((new_lines == lines) && (new_columns == columns)) return;
if (cuY > new_lines - 1) {
// attempt to preserve focus and lines
_bottomMargin = lines - 1; //FIXME: margin lost
for (int i = 0; i < cuY - (new_lines - 1); i++) {
addHistLine(); scrollUp(0, 1);
}
}
// create new screen lines and copy from old to new
ImageLine* newScreenLines = new ImageLine[new_lines + 1];
for (int i = 0; i < qMin(lines, new_lines + 1) ; i++)
newScreenLines[i] = screenLines[i];
for (int i = lines; (i > 0) && (i < new_lines + 1); i++)
newScreenLines[i].resize(new_columns);
lineProperties.resize(new_lines + 1);
for (int i = lines; (i > 0) && (i < new_lines + 1); i++)
lineProperties[i] = LINE_DEFAULT;
clearSelection();
delete[] screenLines;
screenLines = newScreenLines;
lines = new_lines;
columns = new_columns;
cuX = qMin(cuX, columns - 1);
cuY = qMin(cuY, lines - 1);
// FIXME: try to keep values, evtl.
_topMargin = 0;
_bottomMargin = lines - 1;
initTabStops();
clearSelection();
}
void Screen::setDefaultMargins()
{
_topMargin = 0;
_bottomMargin = lines - 1;
}
/*
Clarifying rendition here and in the display.
currently, the display's color table is
0 1 2 .. 9 10 .. 17
dft_fg, dft_bg, dim 0..7, intensive 0..7
currentForeground, currentBackground contain values 0..8;
- 0 = default color
- 1..8 = ansi specified color
re_fg, re_bg contain values 0..17
due to the TerminalDisplay's color table
rendition attributes are
attr widget screen
-------------- ------ ------
RE_UNDERLINE XX XX affects foreground only
RE_BLINK XX XX affects foreground only
RE_BOLD XX XX affects foreground only
RE_REVERSE -- XX
RE_TRANSPARENT XX -- affects background only
RE_INTENSIVE XX -- affects foreground only
Note that RE_BOLD is used in both widget
and screen rendition. Since xterm/vt102
is to poor to distinguish between bold
(which is a font attribute) and intensive
(which is a color attribute), we translate
this and RE_BOLD in falls eventually appart
into RE_BOLD and RE_INTENSIVE.
*/
void Screen::reverseRendition(Character& p) const
{
CharacterColor f = p.foregroundColor;
CharacterColor b = p.backgroundColor;
p.foregroundColor = b;
p.backgroundColor = f; //p->r &= ~RE_TRANSPARENT;
}
void Screen::updateEffectiveRendition()
{
effectiveRendition = currentRendition;
if (currentRendition & RE_REVERSE) {
effectiveForeground = currentBackground;
effectiveBackground = currentForeground;
} else {
effectiveForeground = currentForeground;
effectiveBackground = currentBackground;
}
if (currentRendition & RE_BOLD)
effectiveForeground.setIntensive();
}
void Screen::copyFromHistory(Character* dest, int startLine, int count) const
{
Q_ASSERT(startLine >= 0 && count > 0 && startLine + count <= history->getLines());
for (int line = startLine; line < startLine + count; line++) {
const int length = qMin(columns, history->getLineLen(line));
const int destLineOffset = (line - startLine) * columns;
history->getCells(line, 0, length, dest + destLineOffset);
for (int column = length; column < columns; column++)
dest[destLineOffset + column] = defaultChar;
// invert selected text
if (selBegin != -1) {
for (int column = 0; column < columns; column++) {
if (isSelected(column, line)) {
reverseRendition(dest[destLineOffset + column]);
}
}
}
}
}
void Screen::copyFromScreen(Character* dest , int startLine , int count) const
{
Q_ASSERT(startLine >= 0 && count > 0 && startLine + count <= lines);
for (int line = startLine; line < (startLine + count) ; line++) {
int srcLineStartIndex = line * columns;
int destLineStartIndex = (line - startLine) * columns;
for (int column = 0; column < columns; column++) {
int srcIndex = srcLineStartIndex + column;
int destIndex = destLineStartIndex + column;
dest[destIndex] = screenLines[srcIndex / columns].value(srcIndex % columns, defaultChar);
// invert selected text
if (selBegin != -1 && isSelected(column, line + history->getLines()))
reverseRendition(dest[destIndex]);
}
}
}
void Screen::getImage(Character* dest, int size, int startLine, int endLine) const
{
Q_ASSERT(startLine >= 0);
Q_ASSERT(endLine >= startLine && endLine < history->getLines() + lines);
const int mergedLines = endLine - startLine + 1;
Q_ASSERT(size >= mergedLines * columns);
Q_UNUSED(size);
const int linesInHistoryBuffer = qBound(0, history->getLines() - startLine, mergedLines);
const int linesInScreenBuffer = mergedLines - linesInHistoryBuffer;
// copy lines from history buffer
if (linesInHistoryBuffer > 0)
copyFromHistory(dest, startLine, linesInHistoryBuffer);
// copy lines from screen buffer
if (linesInScreenBuffer > 0)
copyFromScreen(dest + linesInHistoryBuffer * columns,
startLine + linesInHistoryBuffer - history->getLines(),
linesInScreenBuffer);
// invert display when in screen mode
if (getMode(MODE_Screen)) {
for (int i = 0; i < mergedLines * columns; i++)
reverseRendition(dest[i]); // for reverse display
}
// mark the character at the current cursor position
int cursorIndex = loc(cuX, cuY + linesInHistoryBuffer);
if (getMode(MODE_Cursor) && cursorIndex < columns * mergedLines)
dest[cursorIndex].rendition |= RE_CURSOR;
}
QVector<LineProperty> Screen::getLineProperties(int startLine , int endLine) const
{
Q_ASSERT(startLine >= 0);
Q_ASSERT(endLine >= startLine && endLine < history->getLines() + lines);
const int mergedLines = endLine - startLine + 1;
const int linesInHistory = qBound(0, history->getLines() - startLine, mergedLines);
const int linesInScreen = mergedLines - linesInHistory;
QVector<LineProperty> result(mergedLines);
int index = 0;
// copy properties for lines in history
for (int line = startLine; line < startLine + linesInHistory; line++) {
//TODO Support for line properties other than wrapped lines
if (history->isWrappedLine(line)) {
result[index] = (LineProperty)(result[index] | LINE_WRAPPED);
}
index++;
}
// copy properties for lines in screen buffer
const int firstScreenLine = startLine + linesInHistory - history->getLines();
for (int line = firstScreenLine; line < firstScreenLine + linesInScreen; line++) {
result[index] = lineProperties[line];
index++;
}
return result;
}
void Screen::reset(bool clearScreen)
{
setMode(MODE_Wrap); saveMode(MODE_Wrap); // wrap at end of margin
resetMode(MODE_Origin); saveMode(MODE_Origin); // position refere to [1,1]
resetMode(MODE_Insert); saveMode(MODE_Insert); // overstroke
setMode(MODE_Cursor); // cursor visible
resetMode(MODE_Screen); // screen not inverse
resetMode(MODE_NewLine);
_topMargin = 0;
_bottomMargin = lines - 1;
setDefaultRendition();
saveCursor();
if (clearScreen)
clear();
}
void Screen::clear()
{
clearEntireScreen();
home();
}
void Screen::backspace()
{
cuX = qMin(columns - 1, cuX); // nowrap!
cuX = qMax(0, cuX - 1);
if (screenLines[cuY].size() < cuX + 1)
screenLines[cuY].resize(cuX + 1);
if (BS_CLEARS) {
screenLines[cuY][cuX].character = ' ';
screenLines[cuY][cuX].rendition = screenLines[cuY][cuX].rendition & ~RE_EXTENDED_CHAR;
}
}
void Screen::tab(int n)
{
// note that TAB is a format effector (does not write ' ');
if (n == 0) n = 1;
while ((n > 0) && (cuX < columns - 1)) {
cursorRight(1);
while ((cuX < columns - 1) && !tabStops[cuX])
cursorRight(1);
n--;
}
}
void Screen::backtab(int n)
{
// note that TAB is a format effector (does not write ' ');
if (n == 0) n = 1;
while ((n > 0) && (cuX > 0)) {
cursorLeft(1); while ((cuX > 0) && !tabStops[cuX]) cursorLeft(1);
n--;
}
}
void Screen::clearTabStops()
{
for (int i = 0; i < columns; i++) tabStops[i] = false;
}
void Screen::changeTabStop(bool set)
{
if (cuX >= columns) return;
tabStops[cuX] = set;
}
void Screen::initTabStops()
{
tabStops.resize(columns);
// Arrg! The 1st tabstop has to be one longer than the other.
// i.e. the kids start counting from 0 instead of 1.
// Other programs might behave correctly. Be aware.
for (int i = 0; i < columns; i++)
tabStops[i] = (i % 8 == 0 && i != 0);
}
void Screen::newLine()
{
if (getMode(MODE_NewLine))
toStartOfLine();
index();
}
void Screen::checkSelection(int from, int to)
{
if (selBegin == -1)
return;
int scr_TL = loc(0, history->getLines());
//Clear entire selection if it overlaps region [from, to]
if ((selBottomRight >= (from + scr_TL)) && (selTopLeft <= (to + scr_TL)))
clearSelection();
}
void Screen::displayCharacter(unsigned short c)
{
// Note that VT100 does wrapping BEFORE putting the character.
// This has impact on the assumption of valid cursor positions.
// We indicate the fact that a newline has to be triggered by
// putting the cursor one right to the last column of the screen.
int w = konsole_wcwidth(c);
if (w < 0)
return;
else if (w == 0) {
if (QChar(c).category() != QChar::Mark_NonSpacing)
return;
int charToCombineWithX = -1;
int charToCombineWithY = -1;
if (cuX == 0) {
// We are at the beginning of a line, check
// if previous line has a character at the end we can combine with
if (cuY > 0 && columns == screenLines[cuY - 1].size()) {
charToCombineWithX = columns - 1;
charToCombineWithY = cuY - 1;
} else {
// There is nothing to combine with
// TODO Seems gnome-terminal shows the characters alone
// might be worth investigating how to do that
return;
}
} else {
charToCombineWithX = cuX - 1;
charToCombineWithY = cuY;
}
// Prevent "cat"ing binary files from causing crashes.
if (charToCombineWithX >= screenLines[charToCombineWithY].size()) {
return;
}
Character& currentChar = screenLines[charToCombineWithY][charToCombineWithX];
if ((currentChar.rendition & RE_EXTENDED_CHAR) == 0) {
const ushort chars[2] = { currentChar.character, c };
currentChar.rendition |= RE_EXTENDED_CHAR;
currentChar.character = ExtendedCharTable::instance.createExtendedChar(chars, 2);
} else {
ushort extendedCharLength;
const ushort* oldChars = ExtendedCharTable::instance.lookupExtendedChar(currentChar.character, extendedCharLength);
Q_ASSERT(oldChars);
if (oldChars) {
Q_ASSERT(extendedCharLength > 1);
Q_ASSERT(extendedCharLength < 65535);
ushort* chars = new ushort[extendedCharLength + 1];
memcpy(chars, oldChars, sizeof(ushort) * extendedCharLength);
chars[extendedCharLength] = c;
currentChar.character = ExtendedCharTable::instance.createExtendedChar(chars, extendedCharLength + 1);
delete[] chars;
}
}
return;
}
if (cuX + w > columns) {
if (getMode(MODE_Wrap)) {
lineProperties[cuY] = (LineProperty)(lineProperties[cuY] | LINE_WRAPPED);
nextLine();
} else
cuX = columns - w;
}
// ensure current line vector has enough elements
if (screenLines[cuY].size() < cuX + w) {
screenLines[cuY].resize(cuX + w);
}
if (getMode(MODE_Insert)) insertChars(w);
lastPos = loc(cuX, cuY);
// check if selection is still valid.
checkSelection(lastPos, lastPos);
Character& currentChar = screenLines[cuY][cuX];
currentChar.character = c;
currentChar.foregroundColor = effectiveForeground;
currentChar.backgroundColor = effectiveBackground;
currentChar.rendition = effectiveRendition;
currentChar.isRealCharacter = true;
int i = 0;
int newCursorX = cuX + w--;
while (w) {
i++;
if (screenLines[cuY].size() < cuX + i + 1)
screenLines[cuY].resize(cuX + i + 1);
Character& ch = screenLines[cuY][cuX + i];
ch.character = 0;
ch.foregroundColor = effectiveForeground;
ch.backgroundColor = effectiveBackground;
ch.rendition = effectiveRendition;
ch.isRealCharacter = false;
w--;
}
cuX = newCursorX;
}
int Screen::scrolledLines() const
{
return _scrolledLines;
}
int Screen::droppedLines() const
{
return _droppedLines;
}
void Screen::resetDroppedLines()
{
_droppedLines = 0;
}
void Screen::resetScrolledLines()
{
_scrolledLines = 0;
}
void Screen::scrollUp(int n)
{
if (n == 0) n = 1; // Default
if (_topMargin == 0) addHistLine(); // history.history
scrollUp(_topMargin, n);
}
QRect Screen::lastScrolledRegion() const
{
return _lastScrolledRegion;
}
void Screen::scrollUp(int from, int n)
{
if (n <= 0 || from + n > _bottomMargin) return;
_scrolledLines -= n;
_lastScrolledRegion = QRect(0, _topMargin, columns - 1, (_bottomMargin - _topMargin));
//FIXME: make sure `topMargin', `bottomMargin', `from', `n' is in bounds.
moveImage(loc(0, from), loc(0, from + n), loc(columns - 1, _bottomMargin));
clearImage(loc(0, _bottomMargin - n + 1), loc(columns - 1, _bottomMargin), ' ');
}
void Screen::scrollDown(int n)
{
if (n == 0) n = 1; // Default
scrollDown(_topMargin, n);
}
void Screen::scrollDown(int from, int n)
{
_scrolledLines += n;
//FIXME: make sure `topMargin', `bottomMargin', `from', `n' is in bounds.
if (n <= 0)
return;
if (from > _bottomMargin)
return;
if (from + n > _bottomMargin)
n = _bottomMargin - from;
moveImage(loc(0, from + n), loc(0, from), loc(columns - 1, _bottomMargin - n));
clearImage(loc(0, from), loc(columns - 1, from + n - 1), ' ');
}
void Screen::setCursorYX(int y, int x)
{
setCursorY(y); setCursorX(x);
}
void Screen::setCursorX(int x)
{
if (x == 0) x = 1; // Default
x -= 1; // Adjust
cuX = qMax(0, qMin(columns - 1, x));
}
void Screen::setCursorY(int y)
{
if (y == 0) y = 1; // Default
y -= 1; // Adjust
cuY = qMax(0, qMin(lines - 1, y + (getMode(MODE_Origin) ? _topMargin : 0)));
}
void Screen::home()
{
cuX = 0;
cuY = 0;
}
void Screen::toStartOfLine()
{
cuX = 0;
}
int Screen::getCursorX() const
{
return cuX;
}
int Screen::getCursorY() const
{
return cuY;
}
void Screen::clearImage(int loca, int loce, char c)
{
int scr_TL = loc(0, history->getLines());
//FIXME: check positions
//Clear entire selection if it overlaps region to be moved...
if ((selBottomRight > (loca + scr_TL)) && (selTopLeft < (loce + scr_TL))) {
clearSelection();
}
int topLine = loca / columns;
int bottomLine = loce / columns;
Character clearCh(c, currentForeground, currentBackground, DEFAULT_RENDITION, false);
//if the character being used to clear the area is the same as the
//default character, the affected lines can simply be shrunk.
bool isDefaultCh = (clearCh == Screen::defaultChar);
for (int y = topLine; y <= bottomLine; y++) {
lineProperties[y] = 0;
int endCol = (y == bottomLine) ? loce % columns : columns - 1;
int startCol = (y == topLine) ? loca % columns : 0;
QVector<Character>& line = screenLines[y];
if (isDefaultCh && endCol == columns - 1) {
line.resize(startCol);
} else {
if (line.size() < endCol + 1)
line.resize(endCol + 1);
Character* data = line.data();
for (int i = startCol; i <= endCol; i++)
data[i] = clearCh;
}
}
}
void Screen::moveImage(int dest, int sourceBegin, int sourceEnd)
{
Q_ASSERT(sourceBegin <= sourceEnd);
int lines = (sourceEnd - sourceBegin) / columns;
//move screen image and line properties:
//the source and destination areas of the image may overlap,
//so it matters that we do the copy in the right order -
//forwards if dest < sourceBegin or backwards otherwise.
//(search the web for 'memmove implementation' for details)
if (dest < sourceBegin) {
for (int i = 0; i <= lines; i++) {
screenLines[(dest / columns) + i ] = screenLines[(sourceBegin / columns) + i ];
lineProperties[(dest / columns) + i] = lineProperties[(sourceBegin / columns) + i];
}
} else {
for (int i = lines; i >= 0; i--) {
screenLines[(dest / columns) + i ] = screenLines[(sourceBegin / columns) + i ];
lineProperties[(dest / columns) + i] = lineProperties[(sourceBegin / columns) + i];
}
}
if (lastPos != -1) {
int diff = dest - sourceBegin; // Scroll by this amount
lastPos += diff;
if ((lastPos < 0) || (lastPos >= (lines * columns)))
lastPos = -1;
}
// Adjust selection to follow scroll.
if (selBegin != -1) {
bool beginIsTL = (selBegin == selTopLeft);
int diff = dest - sourceBegin; // Scroll by this amount
int scr_TL = loc(0, history->getLines());
int srca = sourceBegin + scr_TL; // Translate index from screen to global
int srce = sourceEnd + scr_TL; // Translate index from screen to global
int desta = srca + diff;
int deste = srce + diff;
if ((selTopLeft >= srca) && (selTopLeft <= srce))
selTopLeft += diff;
else if ((selTopLeft >= desta) && (selTopLeft <= deste))
selBottomRight = -1; // Clear selection (see below)
if ((selBottomRight >= srca) && (selBottomRight <= srce))
selBottomRight += diff;
else if ((selBottomRight >= desta) && (selBottomRight <= deste))
selBottomRight = -1; // Clear selection (see below)
if (selBottomRight < 0) {
clearSelection();
} else {
if (selTopLeft < 0)
selTopLeft = 0;
}
if (beginIsTL)
selBegin = selTopLeft;
else
selBegin = selBottomRight;
}
}
void Screen::clearToEndOfScreen()
{
clearImage(loc(cuX, cuY), loc(columns - 1, lines - 1), ' ');
}
void Screen::clearToBeginOfScreen()
{
clearImage(loc(0, 0), loc(cuX, cuY), ' ');
}
void Screen::clearEntireScreen()
{
// Add entire screen to history
for (int i = 0; i < (lines - 1); i++) {
addHistLine(); scrollUp(0, 1);
}
clearImage(loc(0, 0), loc(columns - 1, lines - 1), ' ');
}
/*! fill screen with 'E'
This is to aid screen alignment
*/
void Screen::helpAlign()
{
clearImage(loc(0, 0), loc(columns - 1, lines - 1), 'E');
}
void Screen::clearToEndOfLine()
{
clearImage(loc(cuX, cuY), loc(columns - 1, cuY), ' ');
}
void Screen::clearToBeginOfLine()
{
clearImage(loc(0, cuY), loc(cuX, cuY), ' ');
}
void Screen::clearEntireLine()
{
clearImage(loc(0, cuY), loc(columns - 1, cuY), ' ');
}
void Screen::setRendition(int re)
{
currentRendition |= re;
updateEffectiveRendition();
}
void Screen::resetRendition(int re)
{
currentRendition &= ~re;
updateEffectiveRendition();
}
void Screen::setDefaultRendition()
{
setForeColor(COLOR_SPACE_DEFAULT, DEFAULT_FORE_COLOR);
setBackColor(COLOR_SPACE_DEFAULT, DEFAULT_BACK_COLOR);
currentRendition = DEFAULT_RENDITION;
updateEffectiveRendition();
}
void Screen::setForeColor(int space, int color)
{
currentForeground = CharacterColor(space, color);
if (currentForeground.isValid())
updateEffectiveRendition();
else
setForeColor(COLOR_SPACE_DEFAULT, DEFAULT_FORE_COLOR);
}
void Screen::setBackColor(int space, int color)
{
currentBackground = CharacterColor(space, color);
if (currentBackground.isValid())
updateEffectiveRendition();
else
setBackColor(COLOR_SPACE_DEFAULT, DEFAULT_BACK_COLOR);
}
void Screen::clearSelection()
{
selBottomRight = -1;
selTopLeft = -1;
selBegin = -1;
}
void Screen::getSelectionStart(int& column , int& line) const
{
if (selTopLeft != -1) {
column = selTopLeft % columns;
line = selTopLeft / columns;
} else {
column = cuX + getHistLines();
line = cuY + getHistLines();
}
}
void Screen::getSelectionEnd(int& column , int& line) const
{
if (selBottomRight != -1) {
column = selBottomRight % columns;
line = selBottomRight / columns;
} else {
column = cuX + getHistLines();
line = cuY + getHistLines();
}
}
void Screen::setSelectionStart(const int x, const int y, const bool mode)
{
selBegin = loc(x, y);
/* FIXME, HACK to correct for x too far to the right... */
if (x == columns) selBegin--;
selBottomRight = selBegin;
selTopLeft = selBegin;
blockSelectionMode = mode;
}
void Screen::setSelectionEnd(const int x, const int y)
{
if (selBegin == -1)
return;
int endPos = loc(x, y);
if (endPos < selBegin) {
selTopLeft = endPos;
selBottomRight = selBegin;
} else {
/* FIXME, HACK to correct for x too far to the right... */
if (x == columns)
endPos--;
selTopLeft = selBegin;
selBottomRight = endPos;
}
// Normalize the selection in column mode
if (blockSelectionMode) {
int topRow = selTopLeft / columns;
int topColumn = selTopLeft % columns;
int bottomRow = selBottomRight / columns;
int bottomColumn = selBottomRight % columns;
selTopLeft = loc(qMin(topColumn, bottomColumn), topRow);
selBottomRight = loc(qMax(topColumn, bottomColumn), bottomRow);
}
}
bool Screen::isSelected(const int x, const int y) const
{
bool columnInSelection = true;
if (blockSelectionMode) {
columnInSelection = x >= (selTopLeft % columns) &&
x <= (selBottomRight % columns);
}
int pos = loc(x, y);
return pos >= selTopLeft && pos <= selBottomRight && columnInSelection;
}
QString Screen::selectedText(bool preserveLineBreaks) const
{
QString result;
QTextStream stream(&result, QIODevice::ReadWrite);
PlainTextDecoder decoder;
decoder.begin(&stream);
writeSelectionToStream(&decoder , preserveLineBreaks);
decoder.end();
return result;
}
bool Screen::isSelectionValid() const
{
return selTopLeft >= 0 && selBottomRight >= 0;
}
void Screen::writeSelectionToStream(TerminalCharacterDecoder* decoder ,
bool preserveLineBreaks) const
{
if (!isSelectionValid())
return;
writeToStream(decoder, selTopLeft, selBottomRight, preserveLineBreaks);
}
void Screen::writeToStream(TerminalCharacterDecoder* decoder,
int startIndex, int endIndex,
bool preserveLineBreaks) const
{
int top = startIndex / columns;
int left = startIndex % columns;
int bottom = endIndex / columns;
int right = endIndex % columns;
Q_ASSERT(top >= 0 && left >= 0 && bottom >= 0 && right >= 0);
for (int y = top; y <= bottom; y++) {
int start = 0;
if (y == top || blockSelectionMode) start = left;
int count = -1;
if (y == bottom || blockSelectionMode) count = right - start + 1;
const bool appendNewLine = (y != bottom);
int copied = copyLineToStream(y,
start,
count,
decoder,
appendNewLine,
preserveLineBreaks);
// if the selection goes beyond the end of the last line then
// append a new line character.
//
// this makes it possible to 'select' a trailing new line character after
// the text on a line.
if (y == bottom &&
copied < count) {
Character newLineChar('\n');
decoder->decodeLine(&newLineChar, 1, 0);
}
}
}
int Screen::copyLineToStream(int line ,
int start,
int count,
TerminalCharacterDecoder* decoder,
bool appendNewLine,
bool preserveLineBreaks) const
{
//buffer to hold characters for decoding
//the buffer is static to avoid initialising every
//element on each call to copyLineToStream
//(which is unnecessary since all elements will be overwritten anyway)
static const int MAX_CHARS = 1024;
static Character characterBuffer[MAX_CHARS];
Q_ASSERT(count < MAX_CHARS);
LineProperty currentLineProperties = 0;
//determine if the line is in the history buffer or the screen image
if (line < history->getLines()) {
const int lineLength = history->getLineLen(line);
// ensure that start position is before end of line
start = qMin(start, qMax(0, lineLength - 1));
// retrieve line from history buffer. It is assumed
// that the history buffer does not store trailing white space
// at the end of the line, so it does not need to be trimmed here
if (count == -1) {
count = lineLength - start;
} else {
count = qMin(start + count, lineLength) - start;
}
// safety checks
Q_ASSERT(start >= 0);
Q_ASSERT(count >= 0);
Q_ASSERT((start + count) <= history->getLineLen(line));
history->getCells(line, start, count, characterBuffer);
if (history->isWrappedLine(line))
currentLineProperties |= LINE_WRAPPED;
} else {
if (count == -1)
count = columns - start;
Q_ASSERT(count >= 0);
const int screenLine = line - history->getLines();
Character* data = screenLines[screenLine].data();
int length = screenLines[screenLine].count();
//retrieve line from screen image
for (int i = start; i < qMin(start + count, length); i++) {
characterBuffer[i - start] = data[i];
}
// count cannot be any greater than length
count = qBound(0, count, length - start);
Q_ASSERT(screenLine < lineProperties.count());
currentLineProperties |= lineProperties[screenLine];
}
if (appendNewLine && (count + 1 < MAX_CHARS)) {
if (currentLineProperties & LINE_WRAPPED) {
// do nothing extra when this line is wrapped.
} else {
// When users ask not to preserve the linebreaks, they usually mean:
// `treat LINEBREAK as SPACE, thus joining multiple lines into
// single line in the same way as 'J' does in VIM.`
characterBuffer[count] = preserveLineBreaks ? Character('\n') : Character(' ') ;
count++;
}
}
//decode line and write to text stream
decoder->decodeLine((Character*) characterBuffer ,
count, currentLineProperties);
return count;
}
void Screen::writeLinesToStream(TerminalCharacterDecoder* decoder, int fromLine, int toLine) const
{
writeToStream(decoder, loc(0, fromLine), loc(columns - 1, toLine));
}
void Screen::addHistLine()
{
// add line to history buffer
// we have to take care about scrolling, too...
if (hasScroll()) {
int oldHistLines = history->getLines();
history->addCellsVector(screenLines[0]);
history->addLine(lineProperties[0] & LINE_WRAPPED);
int newHistLines = history->getLines();
bool beginIsTL = (selBegin == selTopLeft);
// If the history is full, increment the count
// of dropped lines
if (newHistLines == oldHistLines)
_droppedLines++;
// Adjust selection for the new point of reference
if (newHistLines > oldHistLines) {
if (selBegin != -1) {
selTopLeft += columns;
selBottomRight += columns;
}
}
if (selBegin != -1) {
// Scroll selection in history up
int top_BR = loc(0, 1 + newHistLines);
if (selTopLeft < top_BR)
selTopLeft -= columns;
if (selBottomRight < top_BR)
selBottomRight -= columns;
if (selBottomRight < 0)
clearSelection();
else {
if (selTopLeft < 0)
selTopLeft = 0;
}
if (beginIsTL)
selBegin = selTopLeft;
else
selBegin = selBottomRight;
}
}
}
int Screen::getHistLines() const
{
return history->getLines();
}
void Screen::setScroll(const HistoryType& t , bool copyPreviousScroll)
{
clearSelection();
if (copyPreviousScroll)
history = t.scroll(history);
else {
HistoryScroll* oldScroll = history;
history = t.scroll(0);
delete oldScroll;
}
}
bool Screen::hasScroll() const
{
return history->hasScroll();
}
const HistoryType& Screen::getScroll() const
{
return history->getType();
}
void Screen::setLineProperty(LineProperty property , bool enable)
{
if (enable)
lineProperties[cuY] = (LineProperty)(lineProperties[cuY] | property);
else
lineProperties[cuY] = (LineProperty)(lineProperties[cuY] & ~property);
}
void Screen::fillWithDefaultChar(Character* dest, int count)
{
for (int i = 0; i < count; i++)
dest[i] = defaultChar;
}
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