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libgui
qterminal
libqterminal
unix
ScreenWindow.cpp
Go to the documentation of this file.
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/*
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Copyright (C) 2007, 2013 by Robert Knight <
[email protected]
>
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Rewritten for QT4 by e_k <e_k at users.sourceforge.net>, Copyright (C)2008
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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*/
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// Own
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#include "
unix/ScreenWindow.h
"
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// Qt
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#include <QtCore>
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// Konsole
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#include "
unix/Screen.h
"
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ScreenWindow::ScreenWindow
(
QObject
* parent)
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:
QObject
(parent)
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, _windowBuffer(0)
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, _windowBufferSize(0)
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, _bufferNeedsUpdate(true)
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, _windowLines(1)
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, _currentLine(0)
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, _trackOutput(true)
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, _scrollCount(0)
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{
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}
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ScreenWindow::~ScreenWindow
()
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{
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delete
[]
_windowBuffer
;
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}
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void
ScreenWindow::setScreen
(
Screen
* screen)
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{
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Q_ASSERT( screen );
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_screen
=
screen
;
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}
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Screen
*
ScreenWindow::screen
()
const
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{
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return
_screen
;
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}
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Character
*
ScreenWindow::getImage
()
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{
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// reallocate internal buffer if the window size has changed
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int
size
=
windowLines
() *
windowColumns
();
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if
(
_windowBuffer
== 0 ||
_windowBufferSize
!= size)
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{
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delete
[]
_windowBuffer
;
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_windowBufferSize
=
size
;
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_windowBuffer
=
new
Character
[
size
];
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_bufferNeedsUpdate
=
true
;
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}
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if
(!
_bufferNeedsUpdate
)
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return
_windowBuffer
;
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_screen
->
getImage
(
_windowBuffer
,size,
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currentLine
(),
endWindowLine
());
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// this window may look beyond the end of the screen, in which
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// case there will be an unused area which needs to be filled
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// with blank characters
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fillUnusedArea
();
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_bufferNeedsUpdate
=
false
;
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return
_windowBuffer
;
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}
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void
ScreenWindow::fillUnusedArea
()
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{
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int
screenEndLine =
_screen
->
getHistLines
() +
_screen
->
getLines
() - 1;
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int
windowEndLine =
currentLine
() +
windowLines
() - 1;
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int
unusedLines = windowEndLine - screenEndLine;
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int
charsToFill = unusedLines *
windowColumns
();
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Screen::fillWithDefaultChar
(
_windowBuffer
+
_windowBufferSize
- charsToFill,charsToFill);
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}
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// return the index of the line at the end of this window, or if this window
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// goes beyond the end of the screen, the index of the line at the end
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// of the screen.
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//
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// when passing a line number to a Screen method, the line number should
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// never be more than endWindowLine()
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//
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int
ScreenWindow::endWindowLine
()
const
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{
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return
qMin(
currentLine
() +
windowLines
() - 1,
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lineCount
() - 1);
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}
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QVector<LineProperty>
ScreenWindow::getLineProperties
()
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{
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QVector<LineProperty> result =
_screen
->
getLineProperties
(
currentLine
(),
endWindowLine
());
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if
(result.count() !=
windowLines
())
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result.resize(
windowLines
());
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return
result;
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}
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QString
ScreenWindow::selectedText
(
bool
preserveLineBreaks )
const
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{
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return
_screen
->
selectedText
( preserveLineBreaks );
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}
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void
ScreenWindow::getSelectionStart
(
int
& column ,
int
&
line
)
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{
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_screen
->
getSelectionStart
(column,line);
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line -=
currentLine
();
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}
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void
ScreenWindow::getSelectionEnd
(
int
& column ,
int
&
line
)
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{
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_screen
->
getSelectionEnd
(column,line);
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line -=
currentLine
();
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}
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void
ScreenWindow::setSelectionStart
(
int
column ,
int
line
,
bool
columnMode )
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{
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_screen
->
setSelectionStart
( column , qMin(line +
currentLine
(),
endWindowLine
()) , columnMode);
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_bufferNeedsUpdate
=
true
;
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emit
selectionChanged
();
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}
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void
ScreenWindow::setSelectionEnd
(
int
column ,
int
line
)
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{
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_screen
->
setSelectionEnd
( column , qMin(line +
currentLine
(),
endWindowLine
()) );
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_bufferNeedsUpdate
=
true
;
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emit
selectionChanged
();
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}
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bool
ScreenWindow::isSelected
(
int
column ,
int
line
)
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{
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return
_screen
->
isSelected
( column , qMin(line +
currentLine
(),
endWindowLine
()) );
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}
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void
ScreenWindow::clearSelection
()
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{
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_screen
->
clearSelection
();
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emit
selectionChanged
();
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}
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void
ScreenWindow::setWindowLines
(
int
lines)
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{
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Q_ASSERT(lines > 0);
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_windowLines
= lines;
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}
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int
ScreenWindow::windowLines
()
const
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{
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return
_windowLines
;
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}
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int
ScreenWindow::windowColumns
()
const
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{
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return
_screen
->
getColumns
();
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}
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int
ScreenWindow::lineCount
()
const
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{
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return
_screen
->
getHistLines
() +
_screen
->
getLines
();
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}
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int
ScreenWindow::columnCount
()
const
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{
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return
_screen
->
getColumns
();
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}
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QPoint
ScreenWindow::cursorPosition
()
const
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{
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QPoint position;
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position.setX(
_screen
->
getCursorX
() );
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position.setY(
_screen
->
getCursorY
() );
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return
position;
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}
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int
ScreenWindow::currentLine
()
const
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{
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return
qBound(0,
_currentLine
,
lineCount
()-
windowLines
());
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}
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void
ScreenWindow::scrollBy
(
RelativeScrollMode
mode ,
int
amount )
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{
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if
( mode ==
ScrollLines
)
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{
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scrollTo
(
currentLine
() + amount );
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}
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else
if
( mode ==
ScrollPages
)
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{
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scrollTo
(
currentLine
() + amount * (
windowLines
() / 2 ) );
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}
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}
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bool
ScreenWindow::atEndOfOutput
()
const
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{
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return
currentLine
() == (
lineCount
()-
windowLines
());
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}
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void
ScreenWindow::scrollTo
(
int
line
)
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{
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int
maxCurrentLineNumber =
lineCount
() -
windowLines
();
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line = qBound(0,line,maxCurrentLineNumber);
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const
int
delta = line -
_currentLine
;
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_currentLine = line;
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// keep track of number of lines scrolled by,
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// this can be reset by calling resetScrollCount()
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_scrollCount
+= delta;
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_bufferNeedsUpdate
=
true
;
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emit
scrolled
(_currentLine);
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}
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void
ScreenWindow::setTrackOutput
(
bool
trackOutput)
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{
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_trackOutput
=
trackOutput
;
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}
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bool
ScreenWindow::trackOutput
()
const
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{
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return
_trackOutput
;
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}
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int
ScreenWindow::scrollCount
()
const
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{
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return
_scrollCount
;
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}
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void
ScreenWindow::resetScrollCount
()
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{
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_scrollCount
= 0;
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}
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QRect
ScreenWindow::scrollRegion
()
const
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{
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bool
equalToScreenSize =
windowLines
() ==
_screen
->
getLines
();
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if
(
atEndOfOutput
() && equalToScreenSize )
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return
_screen
->
lastScrolledRegion
();
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else
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return
QRect(0,0,
windowColumns
(),
windowLines
());
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}
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void
ScreenWindow::notifyOutputChanged
()
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{
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// move window to the bottom of the screen and update scroll count
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// if this window is currently tracking the bottom of the screen
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if
(
_trackOutput
)
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{
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_scrollCount
-=
_screen
->
scrolledLines
();
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_currentLine
= qMax(0,
_screen
->
getHistLines
() - (
windowLines
()-
_screen
->
getLines
()));
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}
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else
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{
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// if the history is not unlimited then it may
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// have run out of space and dropped the oldest
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// lines of output - in this case the screen
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// window's current line number will need to
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// be adjusted - otherwise the output will scroll
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_currentLine
= qMax(0,
_currentLine
-
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_screen
->
droppedLines
());
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// ensure that the screen window's current position does
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// not go beyond the bottom of the screen
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_currentLine
= qMin( _currentLine ,
_screen
->
getHistLines
() );
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}
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_bufferNeedsUpdate
=
true
;
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emit
outputChanged
();
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}
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