Jam/command_prompt.py

from kivy.uix.label import Label
from kivy.core.window import Window
from kivy.graphics import Color,Rectangle

class Command_prompt(Label):
    
    def __init__(self,app,**kwargs):
        # app is used to share information between widgets
        self.app=app

        # insert mode
        self.insert=False

        # cursor position
        self.cursor=0
        self.cursor_width=9

        # the text, with no color information
        self.raw_text=""

        # init Label
        super(Command_prompt,self).__init__(**kwargs)

        self.keyboard = Window.request_keyboard(None,self,"text")
        self.keyboard.bind(on_textinput=self.on_textinput,on_key_down=self.on_key_down)

        self.draw()

    def draw(self):
        with self.canvas.before:
            # background
            Color(0,0,0)
            Rectangle(pos=self.pos,size=self.size)
            # cursor
            Color(1,1,1)
            Rectangle(pos=(self.pos[0]+self.cursor*self.cursor_width,self.pos[1]),size=(self.cursor_width,self.height))

        # make text under cursor black
        if self.cursor<len(self.raw_text):
            self.text=self.raw_text[:self.cursor]+"[color=000]"+self.raw_text[self.cursor]+"[/color]"+self.raw_text[self.cursor+1:]
        else:
            self.text=self.raw_text

    def on_key_down(self, keyboard, keycode, text, modifiers):
        print(keycode,text,modifiers)
        if self.insert:
            if keycode[1]=="enter":
                self.insert=False
                self.set_text("")
            elif keycode[1]=="left":
                self.move_cursor(-1)
            elif keycode[1]=="right":
                self.move_cursor(1)

    def on_textinput(self,window,text):
        print(text)
        if self.insert:
            self.append_text_at_cursor(text)
        elif text==':':
            self.append_text_at_cursor(text)
            self.insert=True

    # append to text at position of cursor
    def append_text_at_cursor(self,text):
        if self.cursor==len(self.raw_text):
            self.raw_text+=text
        else:
            self.raw_text=self.raw_text[:self.cursor]+text+self.raw_text[self.cursor:]
        self.cursor+=len(text)
        self.draw()

    # set text in prompt
    def set_text(self,text):
        self.raw_text=text
        self.cursor=len(text)
        self.draw()

    # move cursor n steps to right (left if negative)
    def move_cursor(self,n):
        if n==0 or (n>0 and self.cursor==len(self.raw_text)) or (n<0 and self.cursor==0):
            return
        self.cursor=max(0,min(len(self.raw_text),self.cursor+n))
        self.draw()