窗口特性：拖拽

[suhao]

1. 正常拖动窗口
2. 最大化后拖动
3. 全屏禁用拖动

[suhao]

windows7 maximized windows draggable SC_MOVE | HTCAPTION

win7系统以上，窗口最大化后，拖到caption区域会收到WM_SYSCOMMAND消息，但是wparam可能是：SC_MOVE | HTCAPTION

WM_SYSCOMMAND响应处理

    if (SCF_ISSECURE == wparam) {
        // indicates whether the screen saver is secure.
    }

    auto user = 0xFFF0 & wparam;
    auto hittest = wparam & 0x000F;

    if (wparam == SC_CLOSE || user == SC_CLOSE) {
        handled = true;
        SendMessage(WM_CLOSE);
        return 0;
    }

    if (wparam == (SC_MOVE | HTCAPTION)) {
        // 0xF012: drag window.

    }

    switch (user) {
    case SC_CLOSE: break;
    case SC_MAXIMIZE: break; // ShowWindow(SW_MAXIMIZE)
    case SC_MINIMIZE: break; // ShowWindow(SW_MINIMIZE)
    case SC_RESTORE: break; // SW_RESTORE
        
    case SC_MOVE:   
    case SC_SIZE: {
        // size move:
        // * https://github.com/jonathangray/freebsd-1.x-ports/blob/1deabf6e7f2570248fce13534b0a8f2868ba894b/util/wine/windows/nonclient.c
        // * https://github.com/mirror/reactos/blob/c6d2b35ffc91e09f50dfb214ea58237509329d6b/reactos/win32ss/user/ntuser/defwnd.c
        // if (IsZoomed() || IsIconic() || !IsWindowVisible()) return;
        /*
        calc window's position.
        WM_ENTERSIZEMOVE
        WM_EXITSIZEMOVE
        SetWindowPos
        */
    }break;

    case SC_NEXTWINDOW: break;
    case SC_PREVWINDOW: break;

    case SC_TASKLIST: break;
    case SC_HOTKEY: break;
    case SC_MONITORPOWER: break;
    case SC_SCREENSAVE: break;
    default: break;
    }

[suhao]

• Mouse Movement
• User Input: Extended Example
• Mouse Input
• WM_MOUSELEAVE not being generated when left mouse button is held

[suhao]

窗口resize到桌面边缘时自动拉伸高度

NCLButtonDown时可以给窗口增加WS_THICKFRAME， 再up时Remove WS_THICKFRAME