自定义光标颜色的QLineEdit

input_box.cpp

/* 
 * -*- coding: uft-8 -*-
 */

#include "input_box.h"

#include <QPainter>

InputBox::InputBox(QWidget *parent) : QLineEdit(parent) {
    setReadOnly(true);
    blink_timer_.setInterval(500);

    connect(&blink_timer_, &QTimer::timeout, this, &InputBox::Blink);
    connect(this, &InputBox::textChanged, [this] { blink_timer_.start(); });
    connect(this, &InputBox::cursorPositionChanged, this,
            &InputBox::DrawCursor);
}

void InputBox::paintEvent(QPaintEvent *event) {
    QLineEdit::paintEvent(event);
    if (cursor_visibility_) {
        QPainter painter(this);
        QRect rect = cursorRect();
        painter.fillRect(
                QRect(rect.x() + rect.width() / 2, rect.y(), 2, rect.height()),
                Qt::red);
    }
}

void InputBox::showEvent(QShowEvent *event) {
    QLineEdit::showEvent(event);
    blink_timer_.start();
}

void InputBox::hideEvent(QHideEvent *event) {
    QLineEdit::hideEvent(event);
    blink_timer_.stop();
}

// 移除默认光标
void InputBox::keyPressEvent(QKeyEvent *event) {
    setReadOnly(false);
    QLineEdit::keyPressEvent(event);
    setReadOnly(true);
}

void InputBox::Blink() {
    cursor_visibility_ = !cursor_visibility_;
    update();
}

void InputBox::DrawCursor() {
    cursor_visibility_ = true;
    update();
}