funcs_x86_win.py 文件源码

def window__set_style(hwnd, style_update):
    """
    Update a window's style.  "style_update" is a dictionary of style
    keys that map to either True or False, depending on how the style
    should be modified.  Style values not specified in the update
    will not be changed.

    :param hwnd:
    :param style_update:
    :return: the original style values (usable as input to this function).
    """
    assert isinstance(style_update, dict)

    SetWindowLongW = windll.user32.SetWindowLongW
    SetLastError = windll.kernel32.SetLastError

    original_style = window__get_style(hwnd)
    expected_style = dict(original_style)
    std_style_update = False
    std_bits = 0
    for k, mask in WS_STYLE_BIT_MAP.items():
        if k in style_update and original_style[k] != style_update[k]:
            std_style_update = True
            expected_style[k] = style_update[k]
            if style_update[k]:
                std_bits |= mask
        elif original_style[k]:
            std_bits |= mask
    if std_style_update:
        SetLastError(0)
        res = SetWindowLongW(hwnd, GWL_STYLE, std_bits)
        if res == 0 or GetLastError() != 0:
            raise WinError()

    ex_style_update = False
    ex_bits = 0
    for k, mask in WS_EX_STYLE_BIT_MAP.items():
        if k in style_update and original_style[k] != style_update[k]:
            ex_style_update = True
            expected_style[k] = style_update[k]
            if style_update[k]:
                ex_bits |= mask
        elif original_style[k]:
            ex_bits |= mask
    if ex_style_update:
        SetLastError(0)
        res = SetWindowLongW(hwnd, GWL_EXSTYLE, ex_bits)
        if res == 0 or GetLastError() != 0:
            raise WinError()

    # Sometimes, it only changed some of the values.
    # Double check.
    final_style = window__get_style(hwnd)
    if expected_style != final_style:
        # raise OSError("Did not fully set style to {0}; found {1}".format(
        #     expected_style, final_style))
        # print("Did not fully set style to {0}; found {1}".format(
        #      expected_style, final_style))
        pass

    return original_style