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C++/Qt：绘制插入符号

[英]C++/Qt: drawing a caret

原文 2009-03-20 11:24:29 4 1 c++/ qt/ caret/ paint

I'm learning Qt.我正在学习 Qt。 I just started to write a text editor from scratch by inheriting QAbstractScrollArea.我刚刚开始通过继承 QAbstractScrollArea 从头开始编写文本编辑器。 I'm doing this just for practice.我这样做只是为了练习。 But now I'm faced with the problem of displaying a caret.但现在我面临显示插入符号的问题。 What comes to my mind is painter.drawLine and QTimer .我想到的是painter.drawLine和QTimer 。 Can you give some advices on this.您能否就此提出一些建议。 I would also be glad hear some strategies to implement block and underscore caret.我也很高兴听到一些实施块和下划线插入符号的策略。

Off Topic: Is this a bug?题外话：这是一个错误吗？ StackOverflow says there are two answers for this question but I'm seeing only one! StackOverflow 说这个问题有两个答案，但我只看到一个！

1 个解决方案

Take at a look at paintEvent() in QLineEdit .看看QLineEdit中的paintEvent()。 It has a timer that toggles the cursor on and off.它有一个定时器，可以打开和关闭 cursor。 The real cursor drawing is done via QTextLayout::drawCursor .真正的 cursor 绘图是通过QTextLayout::drawCursor完成的。

For a text editor in general, have a look at QPlainTextEdit and QTextEdit .对于一般的文本编辑器，请查看QPlainTextEdit和QTextEdit 。