QT 分页

.cpp 文件

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284

#include "PageNavigator.h" #include "ui_PageNavigator.h"   #include <QtGlobal> #include <QHBoxLayout> #include <QMouseEvent> #include <QKeyEvent> #include <QDebug>     PageNavigator::PageNavigator(int blockSize, QWidget *parent)     : QWidget(parent)     , ui(new Ui::PageNavigator) {     ui->setupUi(this);     setBlockSize(blockSize);     initialize();       m_maxPage = 0;     setMaxPage(1);     QString qss = QString(".QLabel[page=\"true\"] { padding: 6px; }")         + QString(".QLabel[currentPage=\"true\"] { color: rgb(190, 0, 0);}")         + QString(".QLabel[page=\"true\"]:hover { color: white; border-radius: 4px; background-color: qlineargradient(spread:reflect, x1:0, y1:0, x2:0, y2:1, stop:0 rgba(53, 121, 238, 255), stop:1 rgba(0, 202, 237, 255));}");     this->setStyleSheet(qss); }   PageNavigator::~PageNavigator() {     delete ui;     delete m_pageLabels; }   bool PageNavigator::eventFilter(QObject *watched, QEvent *e) {     if (e->type() == QEvent::MouseButtonRelease)     {         int page = -1;         if (watched == ui->previousPageLabel)         {             page = getCurrentPage() - 1;         }           if (watched == ui->nextPageLabel)         {             page = getCurrentPage() + 1;         }           for (int i = 0; i < m_pageLabels->count(); ++i)         {             if (watched == m_pageLabels->at(i))             {                 page = m_pageLabels->at(i)->text().toInt();                 break;             }         }           if (-1 != page)         {             if (!ui->pageLineEdit->text().isEmpty())             {                 ui->pageLineEdit->clear();             }             setCurrentPage(page, true);             return true;         }     }       if (watched == ui->pageLineEdit && e->type() == QEvent::KeyRelease)     {         QKeyEvent *ke = static_cast<QKeyEvent *>(e);         if (ke->key() == Qt::Key_Enter || ke->key() == Qt::Key_Return)         {             setCurrentPage(ui->pageLineEdit->text().toInt(), true);             //setMaxPage(ui->pageLineEdit->text().toInt()); // 测试生成多个页码             return true;         }     }       return QWidget::eventFilter(watched, e); }   int PageNavigator::getBlockSize() const {     return m_blockSize; }   int PageNavigator::getMaxPage() const {     return m_maxPage; }   int PageNavigator::getCurrentPage() const {     return m_currentPage; }   void PageNavigator::setMaxPage(int page) {     page = qMax(page, 1);       if (m_maxPage != page)     {         m_maxPage = page;         m_currentPage = 1;         updatePageLabels();     } }   void PageNavigator::setCurrentPage(int page, bool signalEmitted/* = false*/) {     page = qMax(page, 1);     page = qMin(page, m_maxPage);       if (page != m_currentPage)     {         m_currentPage = page;         updatePageLabels();           if (signalEmitted)         {             emit currentPageChanged(page);         }     } }     void PageNavigator::setBlockSize(int blockSize) {     // 为了便于计算, block size 必须是奇数, 且最小为3     blockSize = qMax(blockSize, 3);     if (blockSize % 2 == 0)     {         ++blockSize;     }     m_blockSize = blockSize; }   QString pageToText(int page) {     return QString::number(page); }   // 初始化页码的labels // 分成三个部分, 左...中...右 void PageNavigator::initialize() {     ui->pageLineEdit->installEventFilter(this);     ui->pageLineEdit->setValidator(new QIntValidator(1, 10000000, this));       ui->nextPageLabel->setProperty("page", "true");     ui->previousPageLabel->setProperty("page", "true");     ui->nextPageLabel->installEventFilter(this);     ui->previousPageLabel->installEventFilter(this);       m_pageLabels = new QList<QLabel *>();       QHBoxLayout *leftLayout = new QHBoxLayout();     QHBoxLayout *centerLayout = new QHBoxLayout();     QHBoxLayout *rightLayout = new QHBoxLayout();     leftLayout->setContentsMargins(0, 0, 0, 0);     leftLayout->setSpacing(0);     centerLayout->setContentsMargins(0, 0, 0, 0);     centerLayout->setSpacing(0);     rightLayout->setContentsMargins(0, 0, 0, 0);     rightLayout->setSpacing(0);       for (int i = 0; i < m_blockSize * 3; ++i)     {         QLabel *label = new QLabel(pageToText(i + 1), this);         label->setProperty("page", "true");         label->installEventFilter(this);           m_pageLabels->append(label);           if (i < m_blockSize)         {             leftLayout->addWidget(label);         }         else if (i < m_blockSize * 2)         {             centerLayout->addWidget(label);         }         else         {             rightLayout->addWidget(label);         }     }       ui->leftPagesWidget->setLayout(leftLayout);     ui->centerPagesWidget->setLayout(centerLayout);     ui->rightPagesWidget->setLayout(rightLayout); }   void PageNavigator::updatePageLabels() {     ui->leftSeparateLabel->hide();     ui->rightSeparateLabel->hide();       if (m_maxPage <= m_blockSize * 3)     {         for (int i = 0; i < m_pageLabels->count(); i += 1)         {             QLabel *label = m_pageLabels->at(i);             if (i < m_maxPage)             {                 label->setText(pageToText(i + 1));                 label->show();             }             else             {                 label->hide();             }               if (m_currentPage - 1 == i)             {                 label->setProperty("currentPage", "true");             }             else             {                 label->setProperty("currentPage", "false");             }               label->setStyleSheet("/**/");         }         return;     }       // 以下情况为maxPageNumber大于blockSize * 3, 所有的页码label都要显示     // c 为 currentPage     // n 为 block size     // m 为 maxPage       // 1. c ∈ [1, n + n/2 + 1]: 显示前 n * 2 个, 后 n 个: 只显示右边的分隔符     // 2. c ∈ [m - n - n/2, m]: 显示前 n 个, 后 n * 2 个: 只显示左边的分隔符     // 3. 显示[1, n], [c - n/2, c + n/2], [m - 2*n + 1, m]: 两个分隔符都显示       int c = m_currentPage;     int n = m_blockSize;     int m = m_maxPage;     int centerStartPage = 0;     if (c >= 1 && c <= n + n / 2 + 1)     {         // 1. c ∈ [1, n + n/2 + 1]: 显示前 n * 2 个, 后 n 个: 只显示右边的分隔符         centerStartPage = n + 1;         ui->rightSeparateLabel->show();     }     else if (c >= m - n - n / 2 && c <= m)     {         // 2. c ∈ [m - n - n/2, m]: 显示前 n 个, 后 n * 2 个: 只显示左边的分隔符         centerStartPage = m - n - n + 1;         ui->leftSeparateLabel->show();     }     else     {         // 3. 显示[1, n], [c - n/2, c + n/2], [m - n + 1, m]: 两个分隔符都显示         centerStartPage = c - n / 2;         ui->rightSeparateLabel->show();         ui->leftSeparateLabel->show();     }       for (int i = 0; i < n; ++i)     {         m_pageLabels->at(i)->setText(pageToText(i + 1));                     // 前面 n 个         m_pageLabels->at(n + i)->setText(pageToText(centerStartPage + i));   // 中间 n 个         m_pageLabels->at(3 * n - i - 1)->setText(pageToText(m - i));         // 后面 n 个     }       for (int i = 0; i < m_pageLabels->count(); ++i)     {         QLabel *label = m_pageLabels->at(i);         int page = label->text().toInt();         if (page == m_currentPage)         {             label->setProperty("currentPage", "true");         }         else         {             label->setProperty("currentPage", "false");         }           label->setStyleSheet("/**/");         label->show();     } }

　　.h 文件：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

#ifndef PAGENAVIGATOR_H #define PAGENAVIGATOR_H   #include <QWidget> #include <QList>   class QLabel; class QEvent;   namespace Ui {     class PageNavigator; }   class PageNavigator : public QWidget {     Q_OBJECT   public:     explicit PageNavigator(int blockSize = 3, QWidget *parent = NULL);     ~PageNavigator();       int getBlockSize() const;     int getMaxPage() const;     int getCurrentPage() const;       // 其他组件只需要调用这两个函数即可     void setMaxPage(int page);   // 当总页数改变时调用     void setCurrentPage(int page, bool signalEmitted = false); // 修改当前页时调用   protected:     virtual bool eventFilter(QObject *watched, QEvent *e);   signals:     void currentPageChanged(int page);   private:     Ui::PageNavigator *ui;     int m_blockSize;     int m_maxPage;     int m_currentPage;     QList<QLabel *> *m_pageLabels;       void setBlockSize(int blockSize);     void updatePageLabels();     void initialize(); };   #endif // PAGENAVIGATOR_H

　　调用：

?

1 2	pageNavigator  = new PageNavigator();     ui->verticalLayout->addWidget(pageNavigator);

　　

?

1	connect(editUser,SIGNAL(refreshUserInfo(int)),this,SLOT(changeMaxPage(int)));

　　

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

void UsrInfoView::changeMaxPage(int page_index) {     search_User_Info searchUserInfo;     currentUserInfoPageIndex=page_index;       searchUserInfo.searchUserName=ui->searchUserNameInput->text();       searchUserInfo.pageIndex= (page_index-1) * globUserInfoPageSize;     searchUserInfo.pageSize=globUserInfoPageSize;  //改成下拉列表的值     searchUserInfo.searUserRole=currentRoleIndex;       showSearchUserInfo(&searchUserInfo);       //currentUserInfoPageIndex=0;     //pageNavigator->setCurrentPage(2); //当前选中页码     pageNavigator->setMaxPage((userCount+globUserInfoPageSize-1)/globUserInfoPageSize);     pageNavigator->setCurrentPage(page_index); }

　　每页数据的展示：

?

1 2 3 4 5

QString pageStr= arg1; QRegExp rx("(\\d+)"); rx.indexIn(pageStr,0); int pageNum=rx.cap(0).toInt(); globUserInfoPageSize=pageNum;