CODEWITHSUNDEEP
c++qtqt5qplaintexteditqtooltip
user7179690
user7179690

Reputation: 1123

how to create tooltip for highlighted strings in QPlainTextEdit

I have a QPlainTextEdit and have some words highlighted in it. Now, when I hover over it with the mouse, I want it to show me a tooltip that has a description or something like that about this highlighted word. Something like this in the Qt IDE:

enter image description here

but I don't know how to start this so any idea, code or similar project to check would be helpful.

Upvotes: 8

Views: 2392

Answers (2)

namezero
namezero

Reputation: 2293

@eyllanesc's answer is great, but I would like to add that if you have viewport margins set, the position must be adjusted because otherwise it will be offset, and an incorrect cursor position reported.

The doc for cursorForPosition() states

returns a QTextCursor at position pos (in viewport coordinates). emphasis added

bool PlainTextEdit::event(QEvent *event)
{
    if (event->type() == QEvent::ToolTip)
    {
        QHelpEvent* helpEvent = static_cast<QHelpEvent*>(event);
        
        QPoint pos = helpEvent->pos();
        pos.setX(pos.x() - viewportMargins().left());
        pos.setY(pos.y() - viewportMargins().top());
        
        QTextCursor cursor = cursorForPosition(pos);
        cursor.select(QTextCursor::WordUnderCursor);
        if (!cursor.selectedText().isEmpty())
            QToolTip::showText(helpEvent->globalPos(), /*your text*/QString("%1 %2").arg(cursor.selectedText()).arg(cursor.selectedText().length()) );

        else
            QToolTip::hideText();
        return true;
    }
    return QPlainTextEdit::event(event);
}

Upvotes: 4

eyllanesc
eyllanesc

Reputation: 243983

For this case I will create a class that inherits from QPlainTextEdit, reimplement the event() method and enable mouse tracking with setMouseTracking()

plaintextedit.h

#ifndef PLAINTEXTEDIT_H
#define PLAINTEXTEDIT_H

#include <QPlainTextEdit>

class PlainTextEdit : public QPlainTextEdit
{
public:
    PlainTextEdit(QWidget *parent=0);

    bool event(QEvent *event);
};

#endif // PLAINTEXTEDIT_H

plaintextedit.cpp

#include "plaintextedit.h"
#include <QToolTip>


PlainTextEdit::PlainTextEdit(QWidget *parent):QPlainTextEdit(parent)
{
    setMouseTracking(true);
}

bool PlainTextEdit::event(QEvent *event)
{
    if (event->type() == QEvent::ToolTip)
    {
        QHelpEvent* helpEvent = static_cast<QHelpEvent*>(event);
        QTextCursor cursor = cursorForPosition(helpEvent->pos());
        cursor.select(QTextCursor::WordUnderCursor);
        if (!cursor.selectedText().isEmpty())
            QToolTip::showText(helpEvent->globalPos(), /*your text*/QString("%1 %2").arg(cursor.selectedText()).arg(cursor.selectedText().length()) );

        else
            QToolTip::hideText();
        return true;
    }
    return QPlainTextEdit::event(event);
}

Complete Code: Here

Upvotes: 6

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