QToolButton按下时下沉效果怎么实现？
如题，我用的是qt-everywhere-opensource-src-4.7.3，平台是Windows。
设计界面用的是Qt Designer，按钮内容是美工画的，采用背景图来实现的。不知道改变那个属性能实现按钮按下时的下沉效果？
多谢各位了！
[解决办法]
帮顶。。。。画两幅图，来回切换
[解决办法]
还有另外一种方法，自己按下按钮后对图片进行灰度之类的处理了
[解决办法]
我以前写的类似的东西，直接给你段代码作参考吧：

MyToolButton::MyToolButton(QWidget *parent, int iconsize, int btnWidth, int btnHeight, int textsize)
: QToolButton(parent)
{
setMouseTracking(true);
setStyleSheet("border-style:flat;");
setCheckable(true);

_bHover = false;
_bPress = false;
setArrowType(Qt::NoArrow);

_mouseHoverPixmap = cached(QString(":/MyQTInterface/Resources/mouse_hover.png"));
_mousePressPixmap = cached(QString(":/MyQTInterface/Resources/mouse_press.png"));
_normalPixmap = cached(QString(":/MyQTInterface/Resources/mouse_disable.png"));

_textDirection = None;

//计算绘制icon的rect和绘制文字的rect
if (textsize == 0)
{
//不绘制文字，把icon绘制在中间
_iconrect = QRect((btnWidth-iconsize)/ 2, (btnHeight - iconsize) / 2, iconsize, iconsize);
}
else
{
//绘制文字，需要考虑文字的高度
_textrect = QRect(0, btnHeight - textsize, btnWidth, textsize);
_iconrect = QRect((btnWidth-iconsize)/ 2,(btnHeight - textsize - iconsize) / 2,iconsize, iconsize);
}
setIconSize(QSize(iconsize,iconsize));
setFixedSize(btnWidth,btnHeight);
}

MyToolButton::~MyToolButton()
{

}

void MyToolButton::leaveEvent(QEvent *event)
{
_bHover = false;
_bPress = false;
update();
}

void MyToolButton::enterEvent(QEvent *event)
{
_bHover = true;
update();
}
void  MyToolButton::mousePressEvent(QMouseEvent *event)
{
_bHover = false;
_bPress = true;
update();
QToolButton::mousePressEvent(event);
}
void  MyToolButton::mouseReleaseEvent(QMouseEvent *event) 
 
{
_bHover = true;
_bPress = false;
update();
QToolButton::mouseReleaseEvent(event);
}
bool MyToolButton::isHover()
{
    return _bHover;
}

void MyToolButton::paintEvent(QPaintEvent *event)
{
QPixmap drawPixmap = cached("");

if (_bHover)
drawPixmap = _mouseHoverPixmap;

else if(_bPress)
drawPixmap = _mousePressPixmap;

else
drawPixmap = _normalPixmap;

//绘制背景
QPainter p(this);
p.drawPixmap(_iconrect, drawPixmap);

//绘制文字
if (_textDirection == Down )
{
p.setPen(Qt::white);
p.drawText(_textrect,Qt::AlignCenter, text());
}
}

void MyToolButton::setTextDirection(TextDirection textDirection )
{
_textDirection = textDirection;
}

void MyToolButton::setMouseHoverPixmap(QPixmap mouseHoverPixmap)
{
_mouseHoverPixmap = mouseHoverPixmap;
}

void MyToolButton::setMousePressPixmap( QPixmap mousePressPixmap )
{ 
_mousePressPixmap = mousePressPixmap;
}

void MyToolButton::setNormalPixmap(QPixmap normalPixmap)
{
_normalPixmap = normalPixmap;
}