combo_box_item_delegate.cpp

//
// Created by Administrator on 2025/5/5.
//

#include "combo_box_item_delegate.hpp"

#include <QPainter>

ComboBoxItemDelegate::ComboBoxItemDelegate(QObject *parent)
    : QStyledItemDelegate(parent) {}

QSize ComboBoxItemDelegate::sizeHint(const QStyleOptionViewItem &option,
                                     const QModelIndex &index) const {
  QSize size = QStyledItemDelegate::sizeHint(option, index);
  size.setHeight(30);
  return size;
}

void ComboBoxItemDelegate::paint(QPainter *painter,
                                 const QStyleOptionViewItem &option,
                                 const QModelIndex &index) const {
  // 定义 padding 值
  constexpr int left = 4;
  constexpr int right = 8;
  constexpr int top = 4;
  constexpr int bottom = 4;

  // 计算绘制文本的矩形区域，padding
  const QRect textRect = option.rect.adjusted(left, top, -right, -bottom);

  // 绘制背景
  if (option.state & QStyle::State_Selected) {
    painter->fillRect(option.rect, option.palette.highlight());
  } else if (option.state & QStyle::State_MouseOver) {
    painter->fillRect(option.rect, QColor(240, 240, 240));
  }

  // 获取显示文本
  const QString text = index.data(Qt::DisplayRole).toString();
  // 绘制文本
  painter->drawText(textRect, Qt::AlignVCenter | Qt::AlignLeft, text);
}