[Qt-interest] Code Editor PlainTextEdit Modified

[Geir Vattekar]

Hi,

The positions of the line numbers are calculated relative to the
editor's viewport, so it should not in any case be necessary to
calculate these based on the global position of the editor. The editor
works as expected if you add it to a QMdiArea.

Do you have a code example where it is necessary to position the line
numbers based on the global position of the editor?


Regards,

Geir Vattekar
--
Technical Writer, Qt Software, Nokia


On Thu, 2009-03-19 at 22:06 +0530, Raja Sekharan wrote:
> Hi,
>  
> The code editor example that shows how to create a text editor with
> line numbers and comes with the QtAssistant help files can be made
> suitable for all situations by a simple modification to the function
>  
>         void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
> in codeeditor.cpp.
>  
> Here's the new function:
>  
>         void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
>          {
>              QPainter painter(lineNumberArea);
>              >>QPoint origin(0,0);
>              >>QPoint globalStart  = this->mapToGlobal(origin);
>              >>QPoint
>         globalEnd(globalStart.x()+this->width(),globalStart.y()+this->height());
>              >>QRect theRect(origin,globalEnd);
>              >>painter.fillRect(theRect, Qt::lightGray);
>          
>         
>              QTextBlock block = firstVisibleBlock();
>              int blockNumber = block.blockNumber();
>              int top = (int)
>         blockBoundingGeometry(block).translated(contentOffset()).top();
>              int bottom = top + (int)
>         blockBoundingRect(block).height();
>          
>              while (block.isValid() && top <= event->rect().bottom())
>         {
>                  if (block.isVisible() && bottom >=
>         event->rect().top()) {
>                      QString number = QString::number(blockNumber +
>         1);
>                      painter.setPen(Qt::black);
>                      painter.drawText(0, top, lineNumberArea->width(),
>         fontMetrics().height(),
>                                       Qt::AlignRight, number);
>                  }
>          
>                  block = block.next();
>                  top = bottom;
>                  bottom = top + (int)
>         blockBoundingRect(block).height();
>                  ++blockNumber;
>              }
>          }
> The lines with the >> are the modified lines. It simply finds the
> global position of the code editor and positions the line numbers
> there. You can use this even if the text editor is movable within the
> window like using inside a QMdiSubWindow.
>  
> Raja Sekharan
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