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Qt 9宫图实现窗口阴影

<pre name="code" class="cpp">#include <QBoxLayout>
#include <QPalette>
#include <QGraphicsDropShadowEffect>
#include <QDebug>
#include <QSizePolicy>
#include <QPainter>

#include "bfwidget.h"

//------------------------------------------------------------
//-----------       Created with 010 Editor        -----------
//------         www.sweetscape.com/010editor/          ------
//
// File    : G:\project\Sample\ShadeWindow\box-shadow.png
// Address : 0 (0x0)
// Size    : 588 (0x24C)
//------------------------------------------------------------
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const QPixmap _DrawNinePatch(QSize szDst, const QPixmap &srcPix)
{
	// 绘制背景图到, 以九宫格形式

	QPixmap dstPix(szDst);
	dstPix.fill(QColor(255, 255, 255, 0));
	QPainter painter;
	painter.begin(&dstPix);

	int nW = szDst.width();
	int nH = szDst.height();

	int nWBg = srcPix.width();
	int nHBg = srcPix.height();
	QPoint m_ptBgLT(10, 10);
	QPoint m_ptBgRB(19, 19);

	QPoint ptDstLT(m_ptBgLT.x(), m_ptBgLT.y());
	QPoint ptDstRB(nW - (nWBg - m_ptBgRB.x()), nH - (nHBg - m_ptBgRB.y()));

	//LT
	painter.drawPixmap(QRect(0, 0, ptDstLT.x(), ptDstLT.y()), srcPix, QRect(0, 0, m_ptBgLT.x(), m_ptBgLT.y()));
	//MT
	painter.drawPixmap(QRect(ptDstLT.x(), 0, ptDstRB.x() - ptDstLT.x(), ptDstLT.y()), srcPix, QRect(m_ptBgLT.x(), 0, m_ptBgRB.x() - m_ptBgLT.x(), m_ptBgLT.y()));
	//RT
	painter.drawPixmap(QRect(ptDstRB.x(), 0, nW - ptDstRB.x(), ptDstLT.y()), srcPix, QRect(m_ptBgRB.x(), 0, nWBg - m_ptBgRB.x(), m_ptBgLT.y()));
	//LM
	painter.drawPixmap(QRect(0, ptDstLT.y(), ptDstLT.x(), ptDstRB.y() - ptDstLT.y()), srcPix, QRect(0, m_ptBgLT.y(), m_ptBgLT.x(), m_ptBgRB.y() - m_ptBgLT.y()));
	//MM
	painter.drawPixmap(QRect(ptDstLT.x(), ptDstLT.y(), ptDstRB.x() - ptDstLT.x(), ptDstRB.y() - ptDstLT.y()), srcPix, QRect(m_ptBgLT.x(), m_ptBgLT.y(), m_ptBgRB.x() - m_ptBgLT.x(), m_ptBgRB.y() - m_ptBgLT.y()));
	//RM
	painter.drawPixmap(QRect(ptDstRB.x(), ptDstLT.y(), nW - ptDstRB.x(), ptDstRB.y() - ptDstLT.y()), srcPix, QRect(m_ptBgRB.x(), m_ptBgLT.y(), nWBg - m_ptBgRB.x(), m_ptBgRB.y() - m_ptBgLT.y()));
	//LB
	painter.drawPixmap(QRect(0, ptDstRB.y(), ptDstLT.x(), nH - ptDstRB.y()), srcPix, QRect(0, m_ptBgRB.y(), m_ptBgLT.x(), nHBg - m_ptBgRB.y()));
	//MB
	painter.drawPixmap(QRect(ptDstLT.x(), ptDstRB.y(), ptDstRB.x() - ptDstLT.x(), nH - ptDstRB.y()), srcPix, QRect(m_ptBgLT.x(), m_ptBgRB.y(), m_ptBgRB.x() - m_ptBgLT.x(), nHBg - m_ptBgRB.y()));
	//RB
	painter.drawPixmap(QRect(ptDstRB.x(), ptDstRB.y(), nW - ptDstRB.x(), nH - ptDstRB.y()), srcPix, QRect(m_ptBgRB.x(), m_ptBgRB.y(), nWBg - m_ptBgRB.x(), nHBg - m_ptBgRB.y()));

	painter.end();
	return dstPix;
}



BFWidget::BFWidget(QWidget *parent) :
QDialog(parent)
{
	//加载阴影图片
	_pixShadow.loadFromData(_hexData, 588);
	//_pixShadow.load("box-shadow.png");
	this->setWindowFlags(Qt::FramelessWindowHint);
	this->setAttribute(Qt::WA_TranslucentBackground);

	this->resize(600 + 12, 400 + 12);
	this->setContentsMargins(6, 6, 6, 6);
}

void BFWidget::mousePressEvent(QMouseEvent * event)
{
	//只能是鼠标左键移动和改变大小
	if (event->button() == Qt::LeftButton)
	{
		mouse_press = true;
	}

	//窗口移动距离
	move_point = event->globalPos() - pos();
}

void BFWidget::mouseReleaseEvent(QMouseEvent *)
{
	mouse_press = false;
}

void BFWidget::mouseMoveEvent(QMouseEvent *event)
{
	//移动窗口
	if (mouse_press)
	{
		QPoint move_pos = event->globalPos();
		move(move_pos - move_point);
	}
}


//void BFWidget::resizeEvent(QResizeEvent *event)
//{
//    QSize size = event->size();
//    container->setGeometry(5, 5, size.width() - 10, size.height() - 10);
//    qDebug() << container->rect();
//}

void BFWidget::paintEvent(QPaintEvent *event)
{
	QPainter painter(this);

	static QColor colItemBg(255, 255, 255);								// 默认背景色

	QSize szThis = this->rect().size();
	QPixmap pixShadowBg = _DrawNinePatch(szThis, _pixShadow);
	//pixShadowBg.save("c:/pixShadowBg1.png");
	painter.drawPixmap(this->rect(), pixShadowBg);

	painter.setPen(colItemBg);   //需要画背景,不然会穿透
	painter.setBrush(colItemBg);
	painter.drawRect(6, 6, szThis.width() - 6 * 2, szThis.height() - 6 * 2);

	//this->setMask(pixShadowBg.mask());  //设置圆角
}

#ifndef BFWIDGET_H#define BFWIDGET_H#include <QWidget>#include <QDialog>#include <QMouseEvent>#include <QResizeEvent>/*** 窗口可以拖动* 窗口增加阴影效果* @brief The BFWidget class*/class BFWidget : public QDialog{Q_OBJECTpublic:explicit BFWidget(QWidget *parent = 0);signals:public slots :protected:void mousePressEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);//void resizeEvent(QResizeEvent *event);void paintEvent(QPaintEvent *event);private://显示内容的区域QPixmap _pixShadow; //阴影图片QPoint move_point; //移动的距离bool mouse_press; //按下鼠标左键};#endif // BFWIDGET_H



Qt 9宫图实现窗口阴影