实战：文件管理器

// TreeView 展开回调（懒加载子目录）
void OnTreeExpand(xui_widget pTree,
    int iNode, void* pUser)
{
    const xui_tree_view_node_t* pNode =
        xuiTreeViewGetNodeById(pTree, iNode);
    const char* sPath = (const char*)pNode->pUser;

    // 扫描子目录，构建节点数组
    dir_entry_t* pDirs = ScanDirs(sPath);
    int iCount = CountDirs(pDirs);
    xui_tree_view_node_t* arrNodes = BuildNodes(pDirs, iNode, iCount);
    xuiTreeViewSetNodes(pTree, arrNodes, iCount);
}

// 点击目录 → 更新文件列表
void OnTreeSelect(xui_widget pTree,
    int iNode, void* pUser)
{
    const xui_tree_view_node_t* pNode =
        xuiTreeViewGetNodeById(pTree, iNode);
    const char* sPath = (const char*)pNode->pUser;

    file_entry_t* pFiles = ScanFiles(sPath);
    int iCount = CountFiles(pFiles);
    const char** arrNames = BuildNameArray(pFiles, iCount);
    xuiListViewSetItems(pFileList, arrNames, iCount);

    // 更新面包屑
    xuiBreadcrumbClearItems(pCrumb);
    AddPathSegments(pCrumb, sPath); // 逐段 AddItem
}

#include "xge.h"
#include "xui.h"

static xui_context g_pCtx;

static int onFrame(void* pUser) {
    (void)pUser;
    xgeClear(0x1e1e2e);
    xui_vec2_t pos;
    xgeMouseGet(&pos.x, &pos.y);
    xuiInputPointerMove(g_pCtx, pos.x, pos.y);
    if (xgeMouseDown(XGE_MOUSE_LEFT))
        xuiInputPointerDown(g_pCtx, pos.x, pos.y, 0);
    else
        xuiInputPointerUp(g_pCtx, pos.x, pos.y, 0);
    xuiUpdate(g_pCtx, xgeGetDelta());
    xuiLayout(g_pCtx);
    xuiRender(g_pCtx, NULL, NULL, 0);
    return XGE_OK;
}

int main(void) {
    xge_desc_t d = {0};
    d.iWidth = 900; d.iHeight = 600;
    d.sTitle = "ch207 - File Manager";
    d.iFlags = XGE_INIT_VSYNC;
    xgeInit(&d);
    xuiCreate(&g_pCtx);
    extern const xui_proxy_t tXgeProxy;
    xui_proxy_t tXgeProxy = xuiProxyXge();
xuiSetProxy(g_pCtx, &tXgeProxy);
    xuiSetViewportSize(g_pCtx, 900, 600);

    xui_widget pRoot;
xuiPanelCreate(g_pCtx, &pRoot, NULL);
    xuiWidgetSetRect(pRoot, (xui_rect_t){0, 0, 900, 600});

    /* 目录树（左侧） */
    xui_widget pTree;
xuiTreeViewCreate(g_pCtx, &pTree, NULL);
xuiWidgetAddChild(pRoot, pTree);
    xuiWidgetSetRect(pTree, (xui_rect_t){0, 36, 240, 564});
    xuiWidgetSetRect(pTree, (xui_rect_t){0, 0, 240, 564});

    /* 文件列表（右侧） */
    xui_widget pList;
xuiListViewCreate(g_pCtx, &pList, NULL);
xuiWidgetAddChild(pRoot, pList);
    xuiWidgetSetRect(pList, (xui_rect_t){240, 36, 660, 564});
    xuiWidgetSetRect(pList, (xui_rect_t){0, 0, 660, 564});

    /* 工具栏 */
    xui_widget pBar;
xuiPanelCreate(g_pCtx, &pBar, NULL);
xuiWidgetAddChild(pRoot, pBar);
    xuiWidgetSetRect(pBar, (xui_rect_t){0, 0, 900, 36});
    xuiWidgetSetRect(pBar, (xui_rect_t){0, 0, 900, 36});

    xgeRun(onFrame, NULL);
    xuiDestroy(g_pCtx);
    xgeUnit();
    return 0;
}