如何使用python和curses滚动显示在终端中的文件内容

问题描述

我正在尝试使用 Python 和 Curses 的文本编辑器。这是代码。

import curses
import sys
import argparse

class Cursor:
def __init__(self,row=0,col=0,col_hint=None):
        self.row = row
        self._col = col
        self._col_hint = col if col_hint is None else col_hint

    @property
    def col(self):
        return self._col

    @col.setter
    def col(self,col):
        self._col = col
        self._col_hint = col

    def up(self,buffer):
        if self.row > 0:
            self.row -= 1
            self._clamp_col(buffer)

    def down(self,buffer):
        if self.row < len(buffer) - 1:
            self.row += 1
            self._clamp_col(buffer)

    def _clamp_col(self,buffer):
        self._col = min(self._col_hint,len(buffer[self.row]))

    def left(self,buffer):
        if self.col > 0:
            self.col -= 1
        elif self.row > 0:
            self.row -= 1
            self.col = len(buffer[self.row])

    def right(self,buffer):
        if self.col < len(buffer[self.row]):
            self.col -= 1
        elif self.row < len(buffer) - 1:
            self.row += 1
            self.col = 0

class Window:
    def __init__(self,n_rows,n_cols,col=0):
        self.n_rows = n_rows
        self.n_cols = n_cols
        self.row = row
        self.col = col

    @property
    def bottom(self):
        return self.row + self.n_rows - 1

    def up(self,cursor):
        if cursor.row == self.row - 1 and self.row > 0:
            self.row -= 1

    def down(self,buffer,cursor):
        if cursor.row == self.bottom + 1 and self.bottom < buffer.bottom:
            self.row += 1

     def translate(self,cursor):
        return cursor.row - self.row,cursor.col - self.col

    def horizontal_scroll(self,cursor,left_margin=5,right_margin=2):
        n_pages = cursor.col // (self.n_cols - right_margin)
        self.col = max(n_pages * self.n_cols - right_margin - left_margin,0)

def main(stdscr):
    parser = argparse.ArgumentParser()
    parser.add_argument("filename")
    args = parser.parse_args()

    window = Window(curses.LInes - 1,curses.COLS - 1)
    cursor = Cursor()

    with open(args.filename) as f:
        buffer = f.readlines()


    while True:
        stdscr.erase()
        for row,line in enumerate(buffer[window.row:window.row + window.n_rows]):
            if row == cursor.row - window.row and window.col > 0:
                line = "«" + line[window.col + 1:]
            if len(line) > window.n_cols:
                line = line[:window.n_cols - 1] + "»"
            stdscr.addstr(row,line)
        stdscr.move(*window.translate(cursor))

        k = stdscr.getkey()
        if k == "q":
            sys.exit(0)
         elif k == "KEY_UP":
            cursor.up()
            window.up(cursor)
            window.horizontal_scroll(cursor)
        elif k == "KEY_DOWN":
            cursor.down(buffer)
            window.down(buffer,cursor)
            window.horizontal_scroll(cursor)
        elif k == "KEY_LEFT":
            cursor.left()
            window.up(cursor)
            window.horizontal_scroll(cursor)
        elif k == "KEY_RIGHT":
            cursor.right(buffer)
            window.down(buffer,cursor)
            window.horizontal_scroll(cursor)


if __name__ == "__main__":
    curses.wrapper(main)

我想显示文件的所有内容。它只显示到窗口大小。另外，我无法左右移动光标。你能帮我看看我哪里出错了。谢谢。

以上代码来自https://wasimlorgat.com/editor链接。

解决方法

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