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Fix part of http://bugzilla.lyx.org/show_bug.cgi?id=5347

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Use crc checking in order to decide if the widget needs to be updated or not. This speed up a lot the cursor moving use case.



git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@26946 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Abdelrazak Younes 2008-10-18 14:14:58 +00:00
parent 34ffe70744
commit 8a916f28a9
1 changed files with 23 additions and 3 deletions
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26
src/frontends/qt4/GuiViewSource.cpp
View File

@ -28,6 +28,8 @@
#include "support/docstream.h"
#include "support/gettext.h"
#include <boost/crc.hpp>
#include <QSettings>
#include <QTextCursor>
#include <QTextDocument>
@ -69,10 +71,19 @@ ViewSourceWidget::ViewSourceWidget()
}
static size_t crcCheck(docstring const & s)
{
boost::crc_32_type crc;
crc.process_bytes(&s[0], sizeof(char_type) * s.size());
return crc.checksum();
}
/** get the source code of selected paragraphs, or the whole document
\param fullSource get full source code
\return true if the content has changed since last call.
*/
static QString getContent(BufferView const * view, bool fullSource)
static bool getContent(BufferView const * view, bool fullSource, QString & qstr)
{
// get the *top* level paragraphs that contain the cursor,
// or the selected text
@ -90,7 +101,14 @@ static QString getContent(BufferView const * view, bool fullSource)
swap(par_begin, par_end);
odocstringstream ostr;
view->buffer().getSourceCode(ostr, par_begin, par_end + 1, fullSource);
return toqstr(ostr.str());
docstring s = ostr.str();
static size_t crc = 0;
size_t newcrc = crcCheck(s);
if (newcrc == crc)
return false;
crc = newcrc;
qstr = toqstr(s);
return true;
}
@ -108,7 +126,9 @@ void ViewSourceWidget::updateView()
return;
}
document_->setPlainText(getContent(bv_, viewFullSourceCB->isChecked()));
QString content;
if (getContent(bv_, viewFullSourceCB->isChecked(), content))
document_->setPlainText(content);
CursorSlice beg = bv_->cursor().selectionBegin().bottom();
CursorSlice end = bv_->cursor().selectionEnd().bottom();