性能优化

// 1. 按需渲染模式
xge_desc_t tDesc = { 0 };
tDesc.iFlags = XGE_INIT_ON_DEMAND;
xgeInit(&tDesc);

// 2. 静态 UI 子树缓存
xui_cache_policy_t tCache = { 0 };
tCache.iPolicy = XUI_CACHE_POLICY_SUBTREE;
xuiWidgetSetCachePolicy(pHeader, &tCache);
xuiWidgetSetCachePolicy(pSidebar, &tCache);

// 3. 虚拟化列表（10 万行）
xui_list_view_desc_t tListDesc = { 0 };
tListDesc.bVirtualize = 1;
tListDesc.iItemCount = 100000;

// 4. 有变化时请求渲染
xgeInvalidateRect(tDirtyRect);
xgeRenderRequest();

#include "xge.h"
#include "xui.h"
#include <stdio.h>

static xui_context g_pCtx;
static xui_widget g_pFps;

static int onFrame(void* pUser) {
    (void)pUser;
    xgeClear(0x1a1a2e);
    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);

    char buf[64];
    sprintf(buf, "FPS: %.0f", 1.0f / xgeGetDelta());
    xuiLabelSetText(g_pFps, buf);

    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 = 640; d.iHeight = 480;
    d.sTitle = "ch200 - Performance";
    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, 640, 480);

    xui_widget pRoot;
xuiPanelCreate(g_pCtx, &pRoot, NULL);
    xuiWidgetSetRect(pRoot, (xui_rect_t){0, 0, 640, 480});

    /* 静态面板 + SUBTREE 缓存 */
    xui_widget pPanel;
xuiPanelCreate(g_pCtx, &pPanel, NULL);
xuiWidgetAddChild(pRoot, pPanel);
    xuiWidgetSetRect(pPanel, (xui_rect_t){40, 60, 560, 300});
    xuiWidgetSetRect(pPanel, (xui_rect_t){0, 0, 560, 300});
    xui_cache_policy_t tCache = {0};
    tCache.iPolicy = XUI_CACHE_POLICY_SUBTREE;
    xuiWidgetSetCachePolicy(pPanel, &tCache);

    /* 填充 50 个按钮 */
    for (int i = 0; i < 50; i++) {
        xui_widget pB;
xuiButtonCreate(g_pCtx, &pB, NULL);
xuiWidgetAddChild(pPanel, pB);
        xuiWidgetSetRect(pB, (xui_rect_t){(i % 10) * 54 + 5, (i / 10) * 54 + 5, 48, 48});
        xuiWidgetSetRect(pB, (xui_rect_t){0, 0, 48, 48});
    }

    g_pFps = xuiLabelCreate(g_pCtx, &g_pFps, NULL);
xuiWidgetAddChild(pRoot, g_pFps);
    xuiLabelSetText(g_pFps, "FPS: --");
    xuiWidgetSetRect(g_pFps, (xui_rect_t){20, 20, 120, 28});
    xuiWidgetSetRect(g_pFps, (xui_rect_t){0, 0, 120, 28});

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