Multicolor tooltip in Qt

问题:

I want to have moveable multicolor tooltip for QGraphicsItems. For example when I click on graphicsItem in scene, tooltip appears, then during dragging mouse tooltip should follow cursor. I can implement movable tooltip with standard QToolTip, but seems Qt support only 1 color for whole tooltip. Also QToolTip doesn't have paintEvent, so I decide to create ColoredTooltip class inherited from QTextEdit, but problem appears when I show at first time ColoredTooltip object. It began to grab mouse events, which is not ok for me, because I can't catch mouseMove events for graphics scene and move coloredTooltip. How can I solve that problem?

回答1:

To color single words (or any part of a text) use Qt's tiny HTML subset supported by its rich text engine. The <font> tag and the attribute color= are supported. QToolTip supports rich text.

This one works for me:

toolTip.setText("foo <font color=\"red\">bar</font>");

To use any RGB color (not only known names), use the hex-notation:

toolTip.setText("foo <font color=\"#ff0000\">bar</font>");

Note that unless you need to move the tool tip while being shown or want to set additional properties, you can simply use QGraphicsItem::setToolTip.