阴影边框很常见,诸如360以及其他很多软件都有类似效果,了解CSS3的同学们应该都知道box-shadow,它就是来设定阴影效果的,那么Qt呢?看过一些资料,说是QSS是基于CSS2的,既然如此,box-shadow是基于CSS3的!那么Qt定然就用不了!
搜了一些资料,每张图片都做成阴影效果的固然不可能,直接舍弃(即使可以,也不采纳)。如果实时的去画图,效率太低,最后选择了拼图的方式!
左上角、左下角、右上角、右下角、上、下、左、右,这几个方向都绘制对应的图即可!
cpp
#include "shadow_widget.h"
ShadowWidget::ShadowWidget(QWidget *parent)
: QDialog(parent)
{
setWindowFlags(Qt::FramelessWindowHint | Qt::Dialog);
setAttribute(Qt::WA_TranslucentBackground);
}
ShadowWidget::~ShadowWidget()
{
}
void ShadowWidget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
this->drawShadow(painter);
painter.setPen(Qt::NoPen);
painter.setBrush(Qt::white);
painter.drawRect(QRect(SHADOW_WIDTH, SHADOW_WIDTH, this->width()-2*SHADOW_WIDTH, this->height()-2*SHADOW_WIDTH));
}
void ShadowWidget::drawShadow(QPainter &painter)
{
//绘制左上角、左下角、右上角、右下角、上、下、左、右边框
QList pixmaps;
pixmaps.append(QPixmap(":/shadow/shadow_left"));
pixmaps.append(QPixmap(":/shadow/shadow_right"));
pixmaps.append(QPixmap(":/shadow/shadow_top"));
pixmaps.append(QPixmap(":/shadow/shadow_bottom"));
pixmaps.append(QPixmap(":/shadow/shadow_left_top"));
pixmaps.append(QPixmap(":/shadow/shadow_right_top"));
pixmaps.append(QPixmap(":/shadow/shadow_left_bottom"));
pixmaps.append(QPixmap(":/shadow/shadow_right_bottom"));
painter.drawPixmap(0, 0, SHADOW_WIDTH, SHADOW_WIDTH, pixmaps[4]);
painter.drawPixmap(this->width()-SHADOW_WIDTH, 0, SHADOW_WIDTH, SHADOW_WIDTH, pixmaps[5]);
painter.drawPixmap(0,this->height()-SHADOW_WIDTH, SHADOW_WIDTH, SHADOW_WIDTH, pixmaps[6]);
painter.drawPixmap(this->width()-SHADOW_WIDTH, this->height()-SHADOW_WIDTH, SHADOW_WIDTH, SHADOW_WIDTH, pixmaps[7]);
painter.drawPixmap(0, SHADOW_WIDTH, SHADOW_WIDTH, this->height()-2*SHADOW_WIDTH, pixmaps[0].scaled(SHADOW_WIDTH, this->height()-2*SHADOW_WIDTH));
painter.drawPixmap(this->width()-SHADOW_WIDTH, SHADOW_WIDTH, SHADOW_WIDTH, this->height()-2*SHADOW_WIDTH, pixmaps[1].scaled(SHADOW_WIDTH, this->height()- 2*SHADOW_WIDTH));
painter.drawPixmap(SHADOW_WIDTH, 0, this->width()-2*SHADOW_WIDTH, SHADOW_WIDTH, pixmaps[2].scaled(this->width()-2*SHADOW_WIDTH, SHADOW_WIDTH));
painter.drawPixmap(SHADOW_WIDTH, this->height()-SHADOW_WIDTH, this->width()-2*SHADOW_WIDTH, SHADOW_WIDTH, pixmaps[3].scaled(this->width()-2*SHADOW_WIDTH, SHADOW_WIDTH));
}
写一个公共的类,如果窗口要实现阴影效果直接继承就行了!SHADOW_WIDTH为阴影边框的像素,可以根据自己的需求自由调节!
也可使用QGraphicsDropShadowEffect来实现。。。