Qt浅谈之四十四动态显示日志（QGraphicsItem）
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一、简介
在QGraphicsItem中使用QGraphicsItemAnimation和QTimeLine来实现动画的显示。其中的数据都是测试数据，仅为显示动画效果。
二、详解
1、部分代码
（1）LogMessagesItem.h#ifndef _LOGMESSAGEITEM_H_#define _LOGMESSAGEITEM_H_#include <QtGui>#include <QtCore>#include "clusterpagenumber.h"#include "calendarselected.h"class LogContentItem;class LogMessagesItem : public QObject, public QGraphicsItem{ Q_OBJECTpublic: explicit LogMessagesItem(QGraphicsItem *parent = 0); QRectF boundingRect() const; void setSize(const int width, const int height);protected: void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); bool eventFilter(QObject *obj, QEvent *event);private: void getLogContents(); void showLogs(); void hideLogItem();private: int _width; int _height; int totalLogs; int totalPageNumber; int currentPageNumber; ClusterPageNumber *pageNumber; CalendarSelected *calendar; QList<LogContentItem *>logItem; QGraphicsRectItem *rectItem; bool leftToRight;private slots: void slotCalendarFinish(); void slotLogPageChange(int index);};class LogContentItem : public QGraphicsItem{public: explicit LogContentItem(QGraphicsItem *parent = 0); ~LogContentItem(); QRectF boundingRect() const; void setData(const QList<QString> &data);protected: void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);private: QGraphicsTextItem *timeText; QGraphicsTextItem *typeText; QGraphicsTextItem *stateText; QGraphicsTextItem *describeText;};#endif（2）LogMessagesItem.cpp#include "LogMessagesItem.h"#define MAXLOGSRPERPAGE 4LogMessagesItem::LogMessagesItem(QGraphicsItem *parent) : QGraphicsItem(parent) , totalLogs(0) , totalPageNumber(1) , currentPageNumber(1) , leftToRight(true){ _width = 633; _height = 437; logItem.clear(); setFiltersChildEvents(true); calendar = new CalendarSelected; QGraphicsProxyWidget *calendarProxy = new QGraphicsProxyWidget(this); calendarProxy->setWidget(calendar); calendarProxy->setPos(10, 10); calendarProxy->show(); calendarProxy->setZValue(1); connect(calendar, SIGNAL(finish()), this, SLOT(slotCalendarFinish())); pageNumber = new ClusterPageNumber; //pageNumber->setBackgroundColor(QColor("#FF0000")); pageNumber->resize(248, 18); pageNumber->setTitle(tr("合计日志条数"), 0); pageNumber->setCurrentAndTotalPage(1, 10); QGraphicsProxyWidget *pageNumberProxy = new QGraphicsProxyWidget(this); pageNumberProxy->setWidget(pageNumber); pageNumberProxy->setPos(633 - 248 -10, 437 - 35); pageNumberProxy->show(); connect(pageNumber, SIGNAL(currentPageChanged(int)), this, SLOT(slotLogPageChange(int))); QGraphicsTextItem *title = new QGraphicsTextItem(this); title->setDefaultTextColor(QColor("#666666")); title->setFont(QFont("arial", 10, QFont::Normal)); title->setPlainText(tr("按状态：")); title->setPos(460, 10); QComboBox *logListBox = new QComboBox; logListBox->resize(100, 23); logListBox->setStyleSheet("QComboBox{border:1px solid #d7d7d7; border-radius: 3px; padding: 1px 18px 1px 3px;} " "QComboBox:editable{ background: white; }" "QComboBox:!editable{ background: #fbfbfb; color:#666666}" "QComboBox::drop-down{ subcontrol-origin: padding; subcontrol-position: top right; width: 22px; border-left-width: 1px; border-left-color: #c9c9c9; border-left-style: solid; /* just a single line */ border-top-right-radius: 3px; /* same radius as the QComboBox */ border-bottom-right-radius: 3px; }" "QComboBox::down-arrow { image: url(:/resources/images/input_drop_down.png); }" "QComboBox::down-arrow:on { /* shift the arrow when popup is open */ top: 1px; left: 1px;}" "QComboBox QAbstractItemView::item{max-width: 30px;min-height: 20px}"); QListView *listView = new QListView; listView->setStyleSheet("QListView{font-size: 11px}" " QListView::item:!selected{color: #19649f}" "QListView::item:selected:active{background-color: #1275c3}" "QListView::item:selected{color: white}"); logListBox->setView(listView); logListBox->addItem(tr("所有日志")); logListBox->addItem(tr("错误日志")); logListBox->addItem(tr("警告日志")); QGraphicsProxyWidget *listBoxrProxy = new QGraphicsProxyWidget(this); listBoxrProxy->setWidget(logListBox); listBoxrProxy->setPos(522, 12); listBoxrProxy->setZValue(1); listBoxrProxy->show(); rectItem = new QGraphicsRectItem(QRectF(0, 0, 610, 85*4), this); rectItem->setPos(12, 45); rectItem->setPen(Qt::NoPen); rectItem->setFlag(QGraphicsItem::ItemClipsChildrenToShape,true); getLogContents();}QRectF LogMessagesItem::boundingRect() const{ return QRectF(0,0, _width, _height);}void LogMessagesItem::setSize(const int width, const int height){ _width = width; _height = height;}void LogMessagesItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){}bool LogMessagesItem::eventFilter(QObject *obj, QEvent *event){ if (obj != calendar && event->type() == QEvent::MouseButtonPress) { this->clearFocus(); calendar->setHideQDialog(); return true; } if (event->type() == QEvent::Hide) { calendar->setHideQDialog(); } if (event->type() == QEvent::Show) { } return QObject::eventFilter(obj, event);}void LogMessagesItem::getLogContents(){ for (int i =0; i < 22; i++) { QList<QString> data; data.append("2015-02-13 12:08:57"); data.append("新建系统"); data.append("系统创建完毕"); data.append(tr("成功创建系统(%1)").arg(i + 1)); LogContentItem *contentItem = new LogContentItem(rectItem); contentItem->setData(data); contentItem->hide(); logItem.append(contentItem); }}void LogMessagesItem::showLogs(){ totalLogs = logItem.count(); //totalLogs = 22; totalPageNumber = 6; //currentPageNumber = 1; hideLogItem(); pageNumber->setTitle(tr("合计日志条数"), 22); pageNumber->setCurrentAndTotalPage(currentPageNumber, 6); LogContentItem *item = NULL; int index = (currentPageNumber - 1)*MAXLOGSRPERPAGE; for(int number = 0; index < totalLogs && index < currentPageNumber*MAXLOGSRPERPAGE; index++, number++) { item = logItem.at(index); item->setPos(0, number*85); item->show(); QGraphicsItemAnimation *animation = new QGraphicsItemAnimation(this); animation->setItem(item); QTimeLine *timeLine = new QTimeLine(400); animation->setTimeLine(timeLine); if (leftToRight == true) { animation->setPosAt(0, QPointF( -608, number*85)); animation->setPosAt(1, QPointF(0, number*85)); } else { animation->setPosAt(0, QPointF( 608, number*85)); animation->setPosAt(1, QPointF(0, number*85)); } timeLine->start(); }}void LogMessagesItem::hideLogItem(){ for (int index = 0; index < logItem.count(); index++) { if (logItem.at(index)) { logItem.at(index)->hide(); } }}void LogMessagesItem::slotCalendarFinish(){ showLogs();}void LogMessagesItem::slotLogPageChange(int index){ if (currentPageNumber < index) { leftToRight = true; } else { leftToRight = false; } currentPageNumber = index; showLogs();}/*****************************LogContentItem********************************/LogContentItem::LogContentItem(QGraphicsItem *parent) : QGraphicsItem(parent){ timeText = new QGraphicsTextItem(this); timeText->setDefaultTextColor(QColor("#999999")); timeText->setFont(QFont("arial", 10, QFont::Normal)); timeText->setPos(boundingRect().right() - 125, boundingRect().top()); typeText = new QGraphicsTextItem(this); typeText->setDefaultTextColor(QColor("#666666")); typeText->setFont(QFont("arial", 10, QFont::Normal)); typeText->setPos(boundingRect().left() + 15, boundingRect().top() + 10); stateText = new QGraphicsTextItem(this); stateText->setDefaultTextColor(QColor("#666666")); stateText->setFont(QFont("arial", 10, QFont::Normal)); stateText->setPos(boundingRect().left() + 15, boundingRect().top() + 30); describeText = new QGraphicsTextItem(this); describeText->setDefaultTextColor(QColor("#666666")); describeText->setFont(QFont("arial", 10, QFont::Normal)); describeText->setPos(boundingRect().left() + 15, boundingRect().top() + 50);}LogContentItem::~LogContentItem(){}QRectF LogContentItem::boundingRect() const{ return QRectF(0, 0, 608, 80);}void LogContentItem::setData(const QList<QString> &data){ timeText->setPlainText(data.at(0)); typeText->setPlainText(QObject::tr("类型：%1").arg(data.at(1))); stateText->setPlainText(QObject::tr("状态：%1").arg(data.at(2))); describeText->setPlainText(QObject::tr("描述：%1").arg(data.at(3)));}void LogContentItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){ painter->setPen(QPen(QColor("#BBBBBB"))); painter->setBrush(QColor("#FFFFFF")); painter->drawRect(0, 0, 608, 80);}（3）LogMessagesView.h#ifndef LOGMESSAGESVIEW_H#define LOGMESSAGESVIEW_H#include <QGraphicsView>#include <QTextCodec>#include <QtGui>#include <QtCore>#include <QDebug>class LogMessagesView : public QGraphicsView{ Q_OBJECTpublic: LogMessagesView(QWidget *parent = 0); ~LogMessagesView();protected: void mousePressEvent ( QMouseEvent * event); void mouseMoveEvent(QMouseEvent *event); void mouseReleaseEvent(QMouseEvent *event);private: QPoint dragPosition; bool bPressFlag;};#endif // LOGMESSAGESVIEW_H（4）LogMessagesView.cpp#include "LogMessagesView.h"#include "LogMessagesItem.h"LogMessagesView::LogMessagesView(QWidget *parent) : QGraphicsView(parent) , bPressFlag(false){ QTextCodec *codec = QTextCodec::codecForName("System"); QTextCodec::setCodecForLocale(codec); QTextCodec::setCodecForCStrings(codec); QTextCodec::setCodecForTr(codec); int width = 633; int height = 437; setWindowFlags(Qt::Widget |Qt::FramelessWindowHint); //setStyleSheet("background:transparent;border:0px"); this->setBackgroundBrush(QBrush(QColor("#EEF7FD"))); QGraphicsScene *scene = new QGraphicsScene(this); scene->setSceneRect(-width/2,-height/2,width,height); setSceneRect(2, 2, width - 4, height - 4); setScene(scene); setCacheMode(QGraphicsView::CacheBackground); setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate); LogMessagesItem *item = new LogMessagesItem; this->installEventFilter(item); scene->addItem(item);}LogMessagesView::~LogMessagesView(){}void LogMessagesView::mousePressEvent ( QMouseEvent * event){ bPressFlag = true; dragPosition = event->pos(); QGraphicsView::mousePressEvent(event);}void LogMessagesView::mouseMoveEvent(QMouseEvent *event){ if (bPressFlag) { QPoint relaPos(QCursor::pos() - dragPosition); move(relaPos); } QGraphicsView::mouseMoveEvent(event);}void LogMessagesView::mouseReleaseEvent(QMouseEvent *event){ bPressFlag = false; QGraphicsView::mouseReleaseEvent(event);}三、总结
（1）因涉及一些项目内容，此处暂不提供源码，请谅解。读者需根据上述思路去完成自己的代码。（2）可执行程序已上传到CSDN（centos6.6下运行）：http://download.csdn.net/detail/taiyang1987912/9436720。
（3）若有问题或建议，请留言，在此感谢！
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