## 20240225 python 筆記
### colorchooser:
顏色選擇器

from tkinter import*
from tkinter import colorchooser

def click():
    color=colorchooser.askcolor()   #會回傳((RGB_value),hexadecimal)
    print(color)
    color_hex=color[1]  #取得後面十六進位值color_hex 可以用來改變bg,foreground,str... 顏色
    
window=Tk()

button=Button(window,text="click",command=click)

button.pack()
window.mainloop()

### text area
Can enter multiple lines of text

from tkinter import*
def submit():
    content=text.get("1.0",END) #1.0代表從第一行第一列開始讀取，END表示最後一個字符，get(起點,終點)
    print(content)
window=Tk()

text=Text(window,
          bg="light yellow",
          font=("ink free",25),
          height=20,
          width=20,
          foreground="purple")  #foreground字體顏色
text.pack()

button = Button(window,text="submit",command=submit)
button.pack()

window.mainloop()

### file dialogue:how to open a file?
用法:
filedialog.askfilename()可以訪問指定路徑的檔案，並將該檔案的完整路徑回傳。

from tkinter import*
from tkinter import filedialog
window=Tk()

def openfile():
    file_path=filedialog.askopenfilename(initialdir="folder_path",  #指定預設開啟資料夾的位址
                                         title="test",  
                                         filetypes=(("text_file","*.txt"),("all_files","*.*"))) #預設可選擇開啟之格式("顯示文字","*.格式")
    file=open(file_path,"r")    
    print(file.read())
    file.close()


button=Button(window,text="open file",command=openfile)
button.pack()


window.mainloop()

### file dialogue(how to save a file?):

from tkinter import*
from tkinter import filedialog

def save_file():
    file=filedialog.asksaveasfile(defaultextension=".txt",  #預設儲存格式
                                  filetypes=(("Text file",".txt"),("html file",".html")))   #可選擇之儲存格式
    content=text_area.get("1.0",END)
    file.write(content)
    file.close()

window=Tk()
button=Button(window,text="save",command=save_file)
text_area=Text(window)


text_area.pack()
button.pack()
window.mainloop()