#include "stdafx.h"
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#include "CExpandableListCtrl.h"
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IMPLEMENT_DYNAMIC(CExpandableListCtrl, CListCtrl)
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CExpandableListCtrl::CExpandableListCtrl() {}
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CExpandableListCtrl::~CExpandableListCtrl() {}
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BEGIN_MESSAGE_MAP(CExpandableListCtrl, CListCtrl)
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ON_WM_CREATE()
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ON_NOTIFY_REFLECT(NM_CLICK, &CExpandableListCtrl::OnClick)
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ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, &CExpandableListCtrl::OnCustomDraw)
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END_MESSAGE_MAP()
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int CExpandableListCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
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{
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if (CListCtrl::OnCreate(lpCreateStruct) == -1)
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return -1;
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// 报表风格列举例
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SetExtendedStyle(GetExtendedStyle()
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| LVS_EX_FULLROWSELECT | LVS_EX_HEADERDRAGDROP | LVS_EX_GRIDLINES);
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// 示例列（可在外部设置）
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if (GetHeaderCtrl() == nullptr || GetHeaderCtrl()->GetItemCount() == 0) {
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InsertColumn(0, _T("名称"), LVCFMT_LEFT, 260);
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InsertColumn(1, _T("状态"), LVCFMT_LEFT, 120);
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InsertColumn(2, _T("描述"), LVCFMT_LEFT, 260);
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}
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return 0;
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}
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CExpandableListCtrl::Node* CExpandableListCtrl::InsertRoot(const std::vector<CString>& cols)
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{
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auto n = std::make_unique<Node>((int)max(1, (int)cols.size()));
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for (size_t i = 0; i < cols.size(); ++i) n->cols[i] = cols[i];
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n->level = 0;
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Node* raw = n.get();
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m_roots.emplace_back(std::move(n));
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return raw;
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}
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CExpandableListCtrl::Node* CExpandableListCtrl::InsertChild(Node* parent, const std::vector<CString>& cols)
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{
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ASSERT(parent);
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auto n = std::make_unique<Node>((int)max(1, (int)cols.size()));
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for (size_t i = 0; i < cols.size(); ++i) n->cols[i] = cols[i];
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n->parent = parent;
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n->level = parent->level + 1;
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Node* raw = n.get();
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parent->children.emplace_back(std::move(n));
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return raw;
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}
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void CExpandableListCtrl::appendVisible(Node* n)
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{
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m_visible.push_back(n);
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if (n->expanded) {
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for (auto& ch : n->children) {
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appendVisible(ch.get());
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}
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}
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}
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void CExpandableListCtrl::RebuildVisible()
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{
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// 1) 重建可见序列
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m_visible.clear();
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for (auto& r : m_roots) appendVisible(r.get());
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// 2) 重绘/重填数据
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SetRedraw(FALSE);
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DeleteAllItems();
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// 插入可见行
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for (int i = 0; i < (int)m_visible.size(); ++i) {
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Node* n = m_visible[i];
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LVITEM lvi{};
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lvi.mask = LVIF_TEXT;
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lvi.iItem = i;
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lvi.iSubItem = 0;
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lvi.pszText = const_cast<LPTSTR>((LPCTSTR)(n->cols.empty() ? _T("") : n->cols[0]));
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InsertItem(&lvi);
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for (int col = 1; col < GetHeaderCtrl()->GetItemCount(); ++col) {
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CString txt = (col < (int)n->cols.size()) ? n->cols[col] : _T("");
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SetItemText(i, col, txt);
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}
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}
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SetRedraw(TRUE);
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Invalidate();
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}
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void CExpandableListCtrl::Expand(Node* n)
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{
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if (!n || n->children.empty()) return;
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if (!n->expanded) { n->expanded = true; RebuildVisible(); }
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}
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void CExpandableListCtrl::Collapse(Node* n)
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{
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if (!n || n->children.empty()) return;
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if (n->expanded) { n->expanded = false; RebuildVisible(); }
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}
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void CExpandableListCtrl::Toggle(Node* n)
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{
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if (!n || n->children.empty()) return;
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n->expanded = !n->expanded;
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RebuildVisible();
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}
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CExpandableListCtrl::Node* CExpandableListCtrl::GetNodeByVisibleIndex(int i) const
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{
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if (i < 0 || i >= (int)m_visible.size()) return nullptr;
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return m_visible[i];
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}
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CRect CExpandableListCtrl::expanderRectForRow(int row) const
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{
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CRect rc;
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// 取首列矩形
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if (!GetSubItemRect(row, 0, LVIR_BOUNDS, rc))
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return CRect(0, 0, 0, 0);
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Node* n = const_cast<CExpandableListCtrl*>(this)->GetNodeByVisibleIndex(row);
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int indent = (n ? n->level : 0);
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// 缩进：每级给 16px
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int left = rc.left + m_expanderPadding + indent * 16;
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CRect box(left, rc.CenterPoint().y - m_expanderSize / 2,
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left + m_expanderSize, rc.CenterPoint().y + m_expanderSize / 2);
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return box;
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}
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void CExpandableListCtrl::OnClick(NMHDR* pNMHDR, LRESULT* pResult)
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{
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LPNMITEMACTIVATE pia = reinterpret_cast<LPNMITEMACTIVATE>(pNMHDR);
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if (pia->iItem >= 0) {
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CPoint pt = pia->ptAction;
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// 命中展开按钮？
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CRect expRc = expanderRectForRow(pia->iItem);
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if (expRc.PtInRect(pt)) {
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Node* n = GetNodeByVisibleIndex(pia->iItem);
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if (n && !n->children.empty()) {
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Toggle(n);
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}
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}
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}
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*pResult = 0;
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}
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void CExpandableListCtrl::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
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{
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LPNMLVCUSTOMDRAW pCD = reinterpret_cast<LPNMLVCUSTOMDRAW>(pNMHDR);
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switch (pCD->nmcd.dwDrawStage)
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{
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case CDDS_PREPAINT:
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*pResult = CDRF_NOTIFYITEMDRAW | CDRF_NOTIFYSUBITEMDRAW;
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return;
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case CDDS_ITEMPREPAINT:
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*pResult = CDRF_NOTIFYSUBITEMDRAW;
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return;
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case CDDS_ITEMPREPAINT | CDDS_SUBITEM:
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{
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int row = (int)pCD->nmcd.dwItemSpec;
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int col = pCD->iSubItem;
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CDC* pDC = CDC::FromHandle(pCD->nmcd.hdc);
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// 仅在首列绘制展开按钮与缩进引导
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if (col == 0) {
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CRect rc;
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GetSubItemRect(row, 0, LVIR_BOUNDS, rc);
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// 默认文本让系统画：我们先画按钮和缩进背景，再返回 CDRF_DODEFAULT
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Node* n = GetNodeByVisibleIndex(row);
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if (n) {
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// 绘制展开三角/方块
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if (!n->children.empty()) {
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CRect box = expanderRectForRow(row);
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// 小方框
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pDC->Rectangle(box);
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// 画“+”或“-”
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CPen pen(PS_SOLID, 1, RGB(0, 0, 0));
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CPen* oldPen = pDC->SelectObject(&pen);
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// 横线
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pDC->MoveTo(box.left + 2, box.CenterPoint().y);
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pDC->LineTo(box.right - 2, box.CenterPoint().y);
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if (!n->expanded) {
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// 竖线（表示 + 号）
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pDC->MoveTo(box.CenterPoint().x, box.top + 2);
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pDC->LineTo(box.CenterPoint().x, box.bottom - 2);
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}
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pDC->SelectObject(oldPen);
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}
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// 把文本左边界右移，留出缩进与按钮空间
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// 这里不改系统绘制的文本起点，而是通过在文本前置空格的方式处理更简单：
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// 我们直接改显示文本（性能足够）：在 RebuildVisible 时已经填了纯文本。
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// 如果你要精准控制文本位置，可以改 OWNERDRAW 或自绘文本。
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}
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}
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*pResult = CDRF_DODEFAULT;
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return;
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}
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}
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*pResult = CDRF_DODEFAULT;
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}
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