import re
from PySide2.QtWidgets import QDialog



def set_font_size(window, text_font_size, text_font_family, sys_font_size, sys_font_family):
    """
    设置 QTextBrowser 和主窗口其他控件的字体大小和字体族
    """
    # 设置 QTextBrowser 控件字体
    text_style_sheet = "QTextBrowser{{font-size:{}pt; font-family:\"{}\";}}".format(text_font_size, text_font_family)

    # 设置其他控件字体
    sys_style_sheet = "QWidget{{font-size:{}pt; font-family:\"{}\";}}".format(sys_font_size, sys_font_family)
    sys_style_sheet += text_style_sheet
    window.setStyleSheet(sys_style_sheet)
                                                        
def get_font_size(window):
    """
    获取当前字体大小和字体族
    """
    style_sheet = window.styleSheet()
    # 使用正则表达式提取字体大小和字体族信息
    widget_regex = re.compile(r'QWidget{[^}]*font-size:(\d+)pt; font-family:"([^"]+)".*}')
    browser_regex = re.compile(r'QTextBrowser{[^}]*font-size:(\d+)pt; font-family:"([^"]+)".*}')
    widget_match = widget_regex.search(style_sheet)
    browser_match = browser_regex.search(style_sheet)

    # 将字体大小和字体族信息分别赋值给对应的变量
    if widget_match:
        sys_font_size, sys_font_family = int(widget_match.group(1)), widget_match.group(2)
    else:
        sys_font_size, sys_font_family = 9, "FreeMono"

    if browser_match:
        text_font_size, text_font_family = int(browser_match.group(1)), browser_match.group(2)
    else:
        text_font_size, text_font_family = 10, "Monospace"
    return text_font_size, text_font_family, sys_font_size, sys_font_family

def change_font_size(widget, step=1):
    text_font_size, text_font_family, sys_font_size, sys_font_family = get_font_size(widget)
    set_font_size(widget, text_font_size+step, text_font_family,sys_font_size+step,sys_font_family)