有qt中有范围（0,0）的循环QProgressbar吗？

本文介绍了有qt中有范围（0,0）的循环QProgressbar吗？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 我想要有循环 QProgressbar ，它的外观必须像正常 QProgressbar I want to have circular QProgressbar which it's appearance must look like the normal QProgressbar with the Range between 0 and 0. 线性 QProgressbar 的代码如下： The code for the linear QProgressbar is some thing like below:QProgressBar *_progressBar = new QProgressBar();_progressBar->setTextVisible(false);_progressBar->setRange(0, 0); 但我想要它是圆形的。有没有办法在qt中实现它？but I want it to be circular. Is there any way to implement it in qt?推荐答案有一天我写了一个简单的类来实现一个循环进度条目的（Qt 4.6）。您可以根据需要修改其外观。希望它会有所帮助。One day I wrote a simple class to implement a circular progress bar for my purposes (Qt 4.6). You can modify its appearance as you need. Hope it will help.#pragma once#include <QtGui>class Loading : public QWidget { Q_OBJECTpublic: explicit Loading(QWidget *parent);protected: double current; bool eventFilter(QObject *obj, QEvent *ev); bool event(QEvent *); void paintEvent(QPaintEvent *); void timerEvent(QTimerEvent *);}; loading.cpp loading.cpp#include "loading.h"/** * @brief Creates a circular loading * @param parent - non-NULL widget that will be contain a circular loading */Loading::Loading(QWidget *parent) : QWidget(parent), current(0) { Q_ASSERT(parent); parent->installEventFilter(this); raise(); setAttribute(Qt::WA_TranslucentBackground); startTimer(20);}bool Loading::eventFilter(QObject *obj, QEvent *ev) { if (obj == parent()) { if (ev->type() == QEvent::Resize) { QResizeEvent * rev = static_cast<QResizeEvent*>(ev); resize(rev->size()); } else if (ev->type() == QEvent::ChildAdded) raise(); } return QWidget::eventFilter(obj, ev);}bool Loading::event(QEvent *ev) { if (ev->type() == QEvent::ParentAboutToChange) { if (parent()) parent()->removeEventFilter(this); } else if (ev->type() == QEvent::ParentChange) { if (parent()) { parent()->installEventFilter(this); raise(); } } return QWidget::event(ev);}void Loading::paintEvent(QPaintEvent *) { QPainter p(this); p.fillRect(rect(), QColor(100, 100, 100, 64)); QPen pen; pen.setWidth(12); pen.setColor(QColor(0, 191, 255)); // DeepSkyBlue p.setPen(pen); p.setRenderHint(QPainter::Antialiasing); QRectF rectangle(width()/2 - 40.0, height()/2 - 40.0, 80.0, 80.0); int spanAngle = (int)(qMin(0.2, current) * 360 * -16); int startAngle = (int)(qMin(0.0, 0.2 - current) * 360 * 16); p.drawArc(rectangle, startAngle, spanAngle);}void Loading::timerEvent(QTimerEvent *) { if (isVisible()) { current += 0.03; if (current > 1.2) current = 0.2; // restart cycle update(); }} 使用 Usage#include "loading.h"int main(int argc, char *argv[]) { QApplication a(argc, argv); QLabel w; w.setMinimumSize(400, 400); Loading *loading = new Loading(&w); QTimer::singleShot(4000, loading, SLOT(hide())); w.show(); return a.exec();} 这篇关于有qt中有范围（0,0）的循环QProgressbar吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！