按钮绘制不同步

[nmgwddj]

Discussed in https://github.com/netease-im/NIM_Duilib_Framework/discussions/381

^{Originally posted by **huangzhengyi** February 10, 2022} 设置按钮的normal(红)、hot(绿) 2种状态颜色 加入按钮点击处理函数 m_pButton->AttachClick([this](ui::EventArgs* args) { SendMessage(WM_SYSCOMMAND, SC_MINIMIZE, 0); return true; }); 会出现，当我们点击按钮窗口最小化了，但是我们重新点击任务栏的窗口显示窗口，发现按钮还是绿色，只有鼠标放在窗口或者按钮上才会重绘这个窗口 void Window::Invalidate(const UiRect& rcItem) { ::InvalidateRect(m_hWnd, &rcItem, FALSE); // Invalidating a layered window will not trigger a WM_PAINT message, // thus we have to post WM_PAINT by ourselves. if (m_bIsLayeredWindow) { ::PostMessage(m_hWnd, WM_PAINT, (LPARAM)&rcItem, (WPARAM)FALSE); } } void Window::Paint() { if (::IsIconic(m_hWnd) || !m_pRoot) { PAINTSTRUCT ps = { 0 }; ::BeginPaint(m_hWnd, &ps); ::EndPaint(m_hWnd, &ps); return; } .... 发现，是通过post发送的paint消息，怀疑是当我点击按钮之后，窗口隐藏了之后才收到paint导致的

[huangzhengyi]

((Button*)msg->pSender)->SetState(kControlStateNormal);
ui::UiRect _rcWnd;
::SendMessage(m_hWnd, WM_PAINT, (LPARAM)&_rcWnd, (WPARAM)FALSE);
ShowWindow(false);

在按钮隐藏前，先刷新一遍