QTableWidget，QTableView分页的分页栏

#include "PageWidget.h" #include "ui_PageWidget.h" #include <QtGlobal> #include <QHBoxLayout> #include <QMouseEvent> #include <QKeyEvent> #include <QDebug> PageWidget::PageWidget(int blockSize, QWidget *parent) : QWidget(parent), ui(new Ui::PageWidget) { ui->setupUi(this); SetBlockSize(blockSize); this->Init(); MaxPage_ = 0; SetMaxPage(1); } PageWidget::~PageWidget() { delete ui; PageLabels_.clear(); } bool PageWidget::eventFilter(QObject *watched, QEvent *e) { //找到当前点击的是哪个页面label，并更新页面 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 < PageLabels_.count(); ++i) { if (watched == PageLabels_.at(i)) { page = PageLabels_.at(i)->text().toInt(); break; } } if(page >0 ) { this->SetCurrentPage(page, true); return true; } } //跳转至该页面 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) { this->SetCurrentPage(ui->pageLineEdit->text().toInt(), true); return true; } } //继续传递事件 return QWidget::eventFilter(watched, e); } int PageWidget::GetBlockSize() const { return BlockSize_; } int PageWidget::GetMaxPage() const { return MaxPage_; } int PageWidget::GetCurrentPage() const { return CurrentPage_; } void PageWidget::SetMaxPage(int maxPage) { maxPage = qMax(maxPage, 1); if (MaxPage_ != maxPage) { this->MaxPage_ = maxPage; this->CurrentPage_ = 1; UpdatePageLabels(); } } void PageWidget::SetCurrentPage(int currentPage, bool signalEmitted) { //确保不越界 currentPage = qMax(currentPage, 1); currentPage = qMin(currentPage, MaxPage_); if (currentPage != this->CurrentPage_) { this->CurrentPage_ = currentPage; //更新每个页面label样式 UpdatePageLabels(); //通知页面已经改变 if (signalEmitted) emit this->SignalCurrentPageChanged(currentPage); } } void PageWidget::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; this->BlockSize_ = blockSize; } // 初始化页码的labels // 分成三个部分, 左...中...右 void PageWidget::Init() { 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); PageLabels_.clear(); 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 < BlockSize_ * 3; ++i) { QLabel *label = new QLabel(QString::number(i + 1)); label->setProperty("page", "true"); label->installEventFilter(this); PageLabels_.push_back(label); if(i < BlockSize_) leftLayout->addWidget(label); else if(i < BlockSize_ * 2) centerLayout->addWidget(label); else rightLayout->addWidget(label); } ui->leftPagesWidget->setLayout(leftLayout); ui->centerPagesWidget->setLayout(centerLayout); ui->rightPagesWidget->setLayout(rightLayout); } void PageWidget::UpdatePageLabels() { ui->leftSeparateLabel->hide(); ui->rightSeparateLabel->hide(); if(MaxPage_ <= BlockSize_ * 3) { for(int i = 0; i < PageLabels_.count(); i += 1) { QLabel *label = PageLabels_.at(i); if(i < MaxPage_) { label->setText(QString::number(i + 1)); label->show(); } else label->hide(); if(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 = CurrentPage_; int n = BlockSize_; int 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) { PageLabels_.at(i)->setText(QString::number(i + 1)); // 前面 n 个 PageLabels_.at(n + i)->setText(QString::number(centerStartPage + i)); // 中间 n 个 PageLabels_.at(3 * n - i - 1)->setText(QString::number(m - i)); // 后面 n 个 } for(int i = 0; i < PageLabels_.count(); ++i) { QLabel *label = PageLabels_.at(i); int page = label->text().toInt(); if(page == CurrentPage_) label->setProperty("currentPage", "true"); else label->setProperty("currentPage", "false"); label->setStyleSheet("/**/"); label->show(); } }