Qt实现桌面雪花飘落代码

#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 //去边框 |Qt::X11BypassWindowManagerHint //linux下脱离任务管理器 |Qt::WindowStaysOnBottomHint //最低层显示 |Qt::Tool //不在任务栏显示 ); 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); }