在Qt的多色工具提示 [英] Multicolor tooltip in Qt

问题描述

我想为QGraphicsItems添加可移动的多色工具提示。例如，当我点击场景中的graphicsItem，工具提示出现，然后在拖动鼠标工具提示应该跟随光标。我可以实现与标准的QToolTip的可移动工具提示，但似乎Qt只支持1颜色整个工具提示。还有QToolTip没有paintEvent，所以我决定创建ColoredTooltip类继承自QTextEdit，但问题出现时，我第一次显示ColoredTooltip对象。它开始抓住鼠标事件，这对我来说不行，因为我无法捕捉mouseMove事件的图形场景和移动coloredTooltip。

要对单个单词（或文本的任何部分）着色，请使用。

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?

解决方案

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.

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