[SOLVED] QStyleOptionViewItem draw text ?
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Hi,
I am working on a tableView that uses a QStyledItemDelegate. Inside the itemDelegate I am trying to render a QLineEdit with someText but somehow the text is not displayed. eg
@if (condition)
{
QStyleOptionViewItem item(option);
item.rect = option.rect;
item.text = "Hello World";
item.palette = QPalette(Qt::Red); // just for testQApplication::style()->drawPrimitive(QStyle::PE_PanelLineEdit, &item, painter);
QApplication::style()->drawPrimitive(QStyle::PE_FrameLineEdit, &item, painter);
}@But the text is not rendered at all but if I use qDebug() << item.text; it gives the right output.
How to render the text using QStyleOptionViewItem ?
Thanks
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i think the problem is that you just don't draw the text ^^
Look at QLineEdit::paintEvent() implementation (<Qt5-src>\qtbase\src\widgets\widgets\qlineedit.cpp).
In there you will see that at the beginning the frame/panel is drawn and then then alot of code follows just for text rendering...You can all the code you need from there
or just draw the text with QPainter::drawText() into the rect (using QStyle::subElementRect(QStyle::SE_LineEditContents))
maybe the most wasiest way: hold a QLineEdit widget as member in your delegate and render it:
@
m_RenderLineEdit.setGeometry(option.rect);
m_RenderLineEdit.render(painter);
@ -
Thanks for a quick reply !!!!
I changed style option to QStyleOpionFrameV2 (I just checked the source of qlineedit.cpp )
@QApplication::style()->drawPrimitive(QStyle::PE_PanelLineEdit, &item, painter);
QApplication::style()->drawPrimitive(QStyle::PE_FrameLineEdit, &item, painter);
painter->drawText(QApplication::style()->subElementRect(QStyle::SE_LineEditContents, &item),text);@
Now the text is rendered but there is a little offset on the y() value , anyhow i'll adjust that. But what about the palette how to change that ?
Thanks
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what exactly do you mean?
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Ok i'll explain in detail,
The background color(yellow/red) of the lineEdit changes based on the validator and the current text. The tableview cell should render the same palette/effect of the lineEdit.
The lineEdit is initialized/editable when a particular cell is clicked. I need to set the same effect for a particular cell. For the tableView each cell contains an object of a class that stores the property like text/palette etc.
Eg I need to render something like
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ok, but why do you want to draw a line edit instead of using a real qlinedit widget?
pro: works our of the box like a qlineedit should
con: may cause performanceOr why do you want to draw a QLineEdit widget at all and not just simply the text with a background color?
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[quote author="raven-worx" date="1371554769"]ok, but why do you want to draw a line edit instead of using a real qlinedit widget?
pro: works our of the box like a qlineedit should
con: may cause performance
[/quote]I can't use setInexWidget() performance drops heavily !!!
bq. Or why do you want to use a QLineEdit widget at all?
The lineEdit is initialized in the createEditor(). what else you recommend ?
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just draw the text with a simple background is enough for you?
How do you exactly change the background color of the line edit when the QValidator fails? By Stylesheet?
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thats why i asked ;)
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One more question I would like to ask , is there anyway we can get the background-color of the lineEdit which is set through stylesheets like in the above image the yellow color is set through stylesheet.
Anything like
lineEdit->palette().color(QPalette::?????); -
try QPalette::Background
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[quote author="Sam" date="1371730152"]and if we are setting the background-color through stylesheets then also its not possible to retrieve the value ?[/quote]
AFAIK: indeed not. The style sheets are not exposed through the public API other then setting them on a widget or the application.I'd love to be proven wrong on this one though!
