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Qt 完成桌面雪花飄落代碼

編輯：關於C++

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代碼很簡略, 貼個重要的完成進程吧. 理應支撐windows和linux桌面版的, 然則linux下就臨時意外試了. 懶得重啟. 有空測試一下.

體系資本消費: 我在1.65GHz 雙核CPU, 4G RAM, 32bit Win7 下, 19M閣下的內存消費, 6%-7%閣下的CPU消費.
全體源碼在前面的鏈接.

#include "widget.h"
#include "ui_widget.h"
#include <QDesktopWidget>
#include <QPalette>
#include <QBrush>

#include <time.h>

#ifdef Q_OS_LINUX
#include <X11/extensions/shape.h>
#endif
#ifdef Q_OS_WIN
#include <windows.h>
#endif

Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
setGeometry(0, 0, qApp->desktop()->width(), qApp->desktop()->height());
setWindowFlags(windowFlags()
       |Qt::FramelessWindowHint //去邊框
       |Qt::X11BypassWindowManagerHint //linux下離開義務治理器
       |Qt::WindowStaysOnBottomHint //最低層顯示
       |Qt::Tool //不在義務欄顯示
     );
setAttribute(Qt::WA_TranslucentBackground);
setWindowState(Qt::WindowNoState //不激活
       |Qt::WindowFullScreen //全屏
       );
setFocusPolicy(Qt::NoFocus);
setWindowOpacity(WINDOW_OPACITY);
#ifdef Q_OS_LINUX
XShapeCombineRectangles(QX11Info::display(), winId(), ShapeInput, 0,
        0, NULL, 0, ShapeSet, YXBanded);
#endif
#ifdef Q_OS_WIN
SetWindowLong(winId(), GWL_EXSTYLE, GetWindowLong(winId(), GWL_EXSTYLE) |
      WS_EX_TRANSPARENT | WS_EX_LAYERED);
#endif
int i=0;
pixmapList[i++].load(":/snowIcons/11.png");
pixmapList[i++].load(":/snowIcons/03.png");
pixmapList[i++].load(":/snowIcons/06.png");
pixmapList[i++].load(":/snowIcons/08.png");
pixmapList[i++].load(":/snowIcons/10.png");
pixmapList[i++].load(":/snowIcons/12.png");
pixmapList[i++].load(":/snowIcons/13.png");
pixmapList[i++].load(":/snowIcons/16.png");
pixmapList[i++].load(":/snowIcons/17.png");
pixmapList[i++].load(":/snowIcons/18.png");
pixmapList[i++].load(":/snowIcons/19.png");

for(i = 0; i < MAX_PICS; i++)
{
picLabel[i] = new QLabel(this);
picLabel[i]->setGeometry(-128, -128, 64, 64);
}
startTimer(150);
}

Widget::~Widget()
{
delete ui;
}

void Widget::timerEvent(QTimerEvent *e)
{
const int timeinit = 10;
static int timeCount = timeinit;
static int initLabel = MAX_PICS;
if(--timeCount <= 0)
{
  qsrand(::time(NULL));
  timeCount = timeinit;
  if(initLabel > 0)
  {
   --initLabel;
   picLabel[initLabel]->move(0, -picLabel[initLabel]->height());
  }
}
FlashSnow();
}

void Widget::SetLabelBG(const QPixmap &pixmap, QLabel *label)
{
if(!label || pixmap.isNull()) return;
QPixmap map = pixmap.scaled(label->size());
if(map.isNull()) return;
label->setPixmap(map);
}

void Widget::FlashSnow()
{
int i;
for(i = 0; i < MAX_PICS; i++)
{
  if(picLabel[i] == NULL) continue;
  if(picLabel[i]->y() == -picLabel[i]->height())
  {
   //resize label
   int size = (qrand()%64)+16;
   picLabel[i]->resize(size, size);

   //init place
   int x = (qrand()%this->width());
   picLabel[i]->move(x, 10-picLabel[i]->height());

   //repaint label's backgroud
   int imgId = (qrand()%MAX_PIXMAP);
   SetLabelBG(pixmapList[imgId], picLabel[i]);
  }
  else
  {
   //snow flow down
   WidgetFlowDown(picLabel[i]);
  }
}
}

void Widget::WidgetFlowDown(QWidget *widget, bool bRandom)
{
if(!widget) return;
int downY = widget->y()+5;
if(bRandom)
{
downY = widget->y()+qrand()%(this->height() - widget->y());
}
if(downY > (this->height())) downY = -widget->height();
widget->move(widget->x(), downY);
}

接上去上個截屏吧: