#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
PANDA3D 基础GUI演示
最简单的DirectGUI使用示例
"""

from direct.showbase.ShowBase import ShowBase
from direct.gui.DirectGui import DirectButton, DirectLabel
from direct.gui.OnscreenText import OnscreenText
from panda3d.core import TextNode

class BasicGUIDemo(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)
        
        # 设置背景颜色
        self.setBackgroundColor(0.2, 0.4, 0.6)
        
        # 尝试加载中文字体
        self.chinese_font = self.loadChineseFont()
        
        # 创建标题
        self.title = OnscreenText(
            text="PANDA3D DirectGUI 基础演示",
            pos=(0, 0.8),
            scale=0.1,
            fg=(1, 1, 1, 1),
            align=TextNode.ACenter,
            font=self.chinese_font if self.chinese_font else None
        )
        
        # 创建一个简单按钮
        self.button = DirectButton(
            text="点击我!",
            pos=(0, 0, 0.2),
            scale=0.1,
            command=self.buttonClicked,
            frameColor=(0.2, 0.8, 0.2, 1),
            text_font=self.chinese_font if self.chinese_font else None
        )
        
        # 创建标签显示状态
        self.statusLabel = DirectLabel(
            text="状态: 等待点击",
            pos=(0, 0, -0.2),
            scale=0.08,
            frameColor=(0, 0, 0, 0),
            text_fg=(1, 1, 0, 1),
            text_font=self.chinese_font if self.chinese_font else None
        )
        
        # 创建退出按钮
        self.exitButton = DirectButton(
            text="退出",
            pos=(0, 0, -0.5),
            scale=0.08,
            command=self.exitDemo,
            frameColor=(0.8, 0.2, 0.2, 1),
            text_font=self.chinese_font if self.chinese_font else None
        )
        
        # 点击计数器
        self.clickCount = 0
        
        print("PANDA3D 基础GUI演示启动成功!")
        print("请点击窗口中的按钮来测试GUI功能")
    
    def buttonClicked(self):
        """按钮点击处理函数"""
        self.clickCount += 1
        self.statusLabel['text'] = f"状态: 按钮被点击了 {self.clickCount} 次"
        print(f"按钮被点击! 总共点击了 {self.clickCount} 次")
        
        # 改变按钮颜色作为反馈
        if self.clickCount % 3 == 0:
            self.button['frameColor'] = (0.8, 0.2, 0.8, 1)  # 紫色
        elif self.clickCount % 3 == 1:
            self.button['frameColor'] = (0.2, 0.8, 0.2, 1)  # 绿色
        else:
            self.button['frameColor'] = (0.2, 0.2, 0.8, 1)  # 蓝色
    
    def exitDemo(self):
        """退出演示"""
        print("用户选择退出")
        self.userExit()
    
    def loadChineseFont(self):
        """尝试加载中文字体"""
        import os
        font_paths = [
            '/usr/share/fonts/truetype/wqy/wqy-microhei.ttc',
            '/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc',
            '/usr/share/fonts/truetype/arphic/ukai.ttc',
            '/usr/share/fonts/truetype/arphic/uming.ttc',
        ]
        
        for font_path in font_paths:
            if os.path.exists(font_path):
                try:
                    font = self.loader.loadFont(font_path)
                    if font:
                        return font
                except:
                    continue
        return None

if __name__ == "__main__":
    print("正在启动PANDA3D基础GUI演示...")
    demo = BasicGUIDemo()
    demo.run()