QToolTip

[suresh]

QToolTip class of qt 3.3.4 has several functions. But QToolTip class of qt 4.1.4 does not have so much functions, even no constructor is available. Is there any alternative class for QToolTip? Or how to use that class in efficient way?

Regards,
Suresh

[wysota]

What exactly do you want to do with it? You have a static QToolTip::showText() method. Do you need anything more?

[jpn]

You can construct your own custom tooltips by using a widget with Qt::ToolTip window flag set. See Tooltips Example to get to know how and when to trigger custom tooltips. You may adapt some ideas from QToolTip implementation (src/gui/widgets/qtooltip.cpp if I remember right) as well.

[suresh]

I will go through the example. If any problem i get back to you.

[jpn]

Oh, and by the way, QToolTip supports images to be embedded out of the box by using appropriate html tags. One negative point in this approach is that the image must exist as a file.

Eg. something like

widget->setToolTip("<img src=\"image.jpg\"/>");

widget->setToolTip("<img src=\"image.jpg\"/>");

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Not sure what would you actually like to put in a tooltip, though..

[wysota]

One negative point in this approach is that the image must exist as a file.

No it doesn't. You can use Qt resource system here:

widget->setToolTip("<img src=':/image.jpg'/>");

widget->setToolTip("<img src=':/image.jpg'/>");

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[jpn]

I meant that a dynamically created image (which is not loaded from a file and neither does not exist as a file), for example a screenshot thumbnail, custom painting, or similar would have to be dumped to a temp file just to be able to show it in a QToolTip using html.

[wysota]

You can try using QTextDocument::addResource(). I'm pretty sure tooltips use QTextDocument. However it's probably not easily accessible from within the API.