117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
#include "pageindicator.h"
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#include <QPainter>
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#include <QMouseEvent>
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PageIndicator::PageIndicator(int pageCount, QWidget *parent)
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: QWidget(parent), m_pageCount(pageCount), m_currentPage(0), m_dotSize(8), m_selectedDotSize(10), m_dotSpacing(14), m_dotColor(QColor(255, 255, 255, 120)), m_selectedColor(QColor(255, 255, 255, 255))
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{
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setCursor(Qt::PointingHandCursor);
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setAttribute(Qt::WA_TranslucentBackground);
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}
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PageIndicator::~PageIndicator()
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{
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}
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void PageIndicator::setPageCount(int count)
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{
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if (count != m_pageCount)
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{
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m_pageCount = count;
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if (m_currentPage >= m_pageCount)
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{
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m_currentPage = m_pageCount - 1;
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}
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update();
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}
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}
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void PageIndicator::setCurrentPage(int page)
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{
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if (page >= 0 && page < m_pageCount && page != m_currentPage)
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{
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m_currentPage = page;
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update();
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}
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}
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void PageIndicator::paintEvent(QPaintEvent *event)
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{
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Q_UNUSED(event)
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing);
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// 计算总宽度
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int totalWidth = 0;
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for (int i = 0; i < m_pageCount; ++i)
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{
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int dotSize = (i == m_currentPage) ? m_selectedDotSize : m_dotSize;
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totalWidth += dotSize;
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if (i < m_pageCount - 1)
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{
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totalWidth += m_dotSpacing;
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}
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}
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// 计算起始位置（居中）
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int startX = (width() - totalWidth) / 2;
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int centerY = height() / 2;
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// 绘制指示点
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int x = startX;
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for (int i = 0; i < m_pageCount; ++i)
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{
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bool isSelected = (i == m_currentPage);
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int dotSize = isSelected ? m_selectedDotSize : m_dotSize;
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QColor color = isSelected ? m_selectedColor : m_dotColor;
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painter.setPen(Qt::NoPen);
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painter.setBrush(color);
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int y = centerY - dotSize / 2;
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painter.drawEllipse(x, y, dotSize, dotSize);
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x += dotSize + m_dotSpacing;
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}
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}
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void PageIndicator::mousePressEvent(QMouseEvent *event)
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{
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// 计算点击位置对应的页面
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int totalWidth = 0;
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for (int i = 0; i < m_pageCount; ++i)
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{
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int dotSize = (i == m_currentPage) ? m_selectedDotSize : m_dotSize;
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totalWidth += dotSize;
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if (i < m_pageCount - 1)
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{
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totalWidth += m_dotSpacing;
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}
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}
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int startX = (width() - totalWidth) / 2;
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int x = startX;
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for (int i = 0; i < m_pageCount; ++i)
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{
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int dotSize = (i == m_currentPage) ? m_selectedDotSize : m_dotSize;
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// 扩大点击区域
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QRect hitRect(x - 8, 0, dotSize + 16, height());
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if (hitRect.contains(event->pos()))
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{
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if (i != m_currentPage)
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{
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emit pageClicked(i);
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}
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break;
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}
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x += dotSize + m_dotSpacing;
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}
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QWidget::mousePressEvent(event);
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}
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