105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
#include "multiLineHeaderView.h"
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#include <QPainter>
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MultiLineHeaderView::MultiLineHeaderView(Qt::Orientation orientation, QWidget* parent)
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: QHeaderView(orientation, parent)
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{
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m_linSpacing = 2;
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m_bgColor = QColor(Qt::white);
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m_borderColor = QColor(Qt::lightGray);
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setSectionResizeMode(QHeaderView::ResizeToContents);//根据内容自动调整大小
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}
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void MultiLineHeaderView::setLineSpacing(int spacing)
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{
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m_linSpacing = spacing;
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}
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void MultiLineHeaderView::setBackgroundColor(QColor& color)
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{
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m_bgColor = color;
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}
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void MultiLineHeaderView::setBorderColor(QColor& color)
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{
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m_borderColor = color;
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}
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void MultiLineHeaderView::paintSection(QPainter* painter, const QRect& rect, int logicalIndex) const
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{
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if(!painter->isActive())
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return;
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//绘制背景
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painter->fillRect(rect, m_bgColor);
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//获取文本
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QString text = model()->headerData(logicalIndex, orientation()).toString();
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QStringList lines = text.split('\n');
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//获取当前列的样式
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QMap<int, HeaderLineStyle> styles = m_sectionStyles.value(logicalIndex);
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//计算总高度并垂直居中
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int totalHeight = 0;
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QVector<int> lineHeights;
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for(int i = 0; i < lines.size(); i++)
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{
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HeaderLineStyle style = styles.value(i, m_defaultStyle);
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QFontMetrics fm(style.font);
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lineHeights.append(fm.height());
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totalHeight += fm.height() + (i < lines.size() - 1 ? m_linSpacing : 0);
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}
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int y = rect.y() + (rect.height() - totalHeight) * 0.5;
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//逐行绘制文本
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for(int i = 0; i < lines.size(); i++)
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{
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const QString& line = lines.at(i);
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HeaderLineStyle style = styles.value(i, m_defaultStyle);
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QFontMetrics fm(style.font);
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//水平位置
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int padding = 10;
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int x = rect.x() + padding; //左对齐
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if(style.alignment & Qt::AlignRight) //右对齐
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x = rect.right() - fm.horizontalAdvance(line) - 4;//'horizontalAdvance'计算文本的横向距离
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else if(style.alignment & Qt::AlignHCenter) //水平居中
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x = rect.x() + (rect.width() - fm.horizontalAdvance(line)) * 0.5;
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//设置字体和颜色
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painter->setFont(style.font);
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painter->setPen(style.color);
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//绘制文本
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painter->drawText(x, y + fm.ascent(), line); //绘制文本的基线X轴离文本上方的距离为ascent，下方距离为descent
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y = y + lineHeights[i] + m_linSpacing;
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}
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//绘制边框
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QPen pen(m_borderColor, 1);
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painter->setPen(pen);
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QRect adjustRect = rect.adjusted(0, 0, 1, 0);
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painter->drawLine(adjustRect.topLeft(), adjustRect.bottomLeft());
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painter->drawLine(adjustRect.topRight(), adjustRect.bottomRight());
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}
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//自动调整行高
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QSize MultiLineHeaderView::sectionSizeFromContents(int logicalIndex) const
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{
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//获取文本
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QString text = model()->headerData(logicalIndex, orientation()).toString();
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//获取当前列的样式
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QMap<int, HeaderLineStyle> styles = m_sectionStyles.value(logicalIndex);
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QStringList lines = text.split('\n');
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int maxWidth = 0;
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int totalHeight = 0;
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for(int i = 0; i < lines.size(); i++)
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{
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HeaderLineStyle style = styles.value(i, m_defaultStyle);
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QFontMetrics fm(style.font);
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maxWidth = qMax(maxWidth, fm.horizontalAdvance(lines[i]));
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totalHeight += fm.height() + (i < lines.size() - 1 ? m_linSpacing : 0);
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}
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//qDebug() << maxWidth << "," << totalHeight;
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return QSize(maxWidth + 20, totalHeight + 4);
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}
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void MultiLineHeaderView::setSectionLineStyle(int section, int line, const HeaderLineStyle& style)
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{
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m_sectionStyles[section][line] = style;
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updateSection(section);
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}
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