Qt按钮自定义特效buttonEffects

相关资料：不记得是在哪里看到的了，不好意思了原作者。

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
    main.cpp 
    mainwindow.cpp

HEADERS += 
    mainwindow.h

FORMS +=

TARGET = buttonEffects

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

main.cpp

#include <QApplication>
#include <mainwindow.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    TMainWnd window;
    window.show();
    window.resize(800,500);
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include <QTimerEvent>

class TPushBtn2 : public QPushButton
{
    Q_OBJECT
public:
    explicit TPushBtn2(QWidget *parent = 0);
    TPushBtn2(const QString  &,QWidget *parent = 0);
    void UpdateAlpha();
signals:
public slots:
protected:
    void timerEvent(QTimerEvent *e);
    void enterEvent(QEvent *);
    void leaveEvent(QEvent *);
    void changeMe();
private:
    int _alpha;
    int _alphaTimer;
    qint8 _nDirection;
};

class TMainWnd : public QWidget
{
    Q_OBJECT
public:
    explicit TMainWnd(QWidget *parent = 0);
signals:
public slots:
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"

TMainWnd::TMainWnd(QWidget *parent) :
    QWidget(parent)
{
    QVBoxLayout *mainLO = new QVBoxLayout;
    for(int i = 0 ; i < 10 ; i ++){
        TPushBtn2 *btn  = new TPushBtn2(tr("Test %1").arg(i));
        mainLO->addWidget(btn );
    }
    // style()->drawControl(.drawPushButton(this, paint);
    setLayout(mainLO);
}

TPushBtn2::TPushBtn2(QWidget *parent) :
    QPushButton(parent)
{}

TPushBtn2::TPushBtn2(const QString &text, QWidget *parent)
    :QPushButton(text,parent),_nDirection(1)
{}

void TPushBtn2::timerEvent(QTimerEvent *e)
{
    changeMe();
}

void TPushBtn2::enterEvent(QEvent *)
{
    _alpha = 255;
    _nDirection = 1;
    changeMe();
}

void TPushBtn2::leaveEvent(QEvent *)
{
    if(_alphaTimer) killTimer(_alphaTimer);
    _nDirection = -1;
    _alphaTimer = startTimer(100);
}

void TPushBtn2::changeMe()
{
    _alpha += 45 * _nDirection;

    QPalette pal =this-> palette();

    QColor cr  = pal.window().color();

    if(_alpha >= 255){
      if(_alphaTimer)  killTimer(_alphaTimer);
        _alphaTimer = 0;
        _alpha =  255 ;
    }    else if( _alpha <= 0) {
        killTimer(_alphaTimer);
        _alphaTimer = 0;
        _alpha =  0 ;
    }
    cr.setRed(_alpha);
    cr.setBlue(_alpha);
    pal.setColor(QPalette::All,QPalette::Button , cr);

   this-> setPalette(pal);
}