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: /lib64/python3.6/curses/ [ drwxr-xr-x ]

name : textpad.py
"""Simple textbox editing widget with Emacs-like keybindings."""

import curses
import curses.ascii

def rectangle(win, uly, ulx, lry, lrx):
    """Draw a rectangle with corners at the provided upper-left
    and lower-right coordinates.
    """
    win.vline(uly+1, ulx, curses.ACS_VLINE, lry - uly - 1)
    win.hline(uly, ulx+1, curses.ACS_HLINE, lrx - ulx - 1)
    win.hline(lry, ulx+1, curses.ACS_HLINE, lrx - ulx - 1)
    win.vline(uly+1, lrx, curses.ACS_VLINE, lry - uly - 1)
    win.addch(uly, ulx, curses.ACS_ULCORNER)
    win.addch(uly, lrx, curses.ACS_URCORNER)
    win.addch(lry, lrx, curses.ACS_LRCORNER)
    win.addch(lry, ulx, curses.ACS_LLCORNER)

class Textbox:
    """Editing widget using the interior of a window object.
     Supports the following Emacs-like key bindings:

    Ctrl-A      Go to left edge of window.
    Ctrl-B      Cursor left, wrapping to previous line if appropriate.
    Ctrl-D      Delete character under cursor.
    Ctrl-E      Go to right edge (stripspaces off) or end of line (stripspaces on).
    Ctrl-F      Cursor right, wrapping to next line when appropriate.
    Ctrl-G      Terminate, returning the window contents.
    Ctrl-H      Delete character backward.
    Ctrl-J      Terminate if the window is 1 line, otherwise insert newline.
    Ctrl-K      If line is blank, delete it, otherwise clear to end of line.
    Ctrl-L      Refresh screen.
    Ctrl-N      Cursor down; move down one line.
    Ctrl-O      Insert a blank line at cursor location.
    Ctrl-P      Cursor up; move up one line.

    Move operations do nothing if the cursor is at an edge where the movement
    is not possible.  The following synonyms are supported where possible:

    KEY_LEFT = Ctrl-B, KEY_RIGHT = Ctrl-F, KEY_UP = Ctrl-P, KEY_DOWN = Ctrl-N
    KEY_BACKSPACE = Ctrl-h
    """
    def __init__(self, win, insert_mode=False):
        self.win = win
        self.insert_mode = insert_mode
        self._update_max_yx()
        self.stripspaces = 1
        self.lastcmd = None
        win.keypad(1)

    def _update_max_yx(self):
        maxy, maxx = self.win.getmaxyx()
        self.maxy = maxy - 1
        self.maxx = maxx - 1

    def _end_of_line(self, y):
        """Go to the location of the first blank on the given line,
        returning the index of the last non-blank character."""
        self._update_max_yx()
        last = self.maxx
        while True:
            if curses.ascii.ascii(self.win.inch(y, last)) != curses.ascii.SP:
                last = min(self.maxx, last+1)
                break
            elif last == 0:
                break
            last = last - 1
        return last

    def _insert_printable_char(self, ch):
        self._update_max_yx()
        (y, x) = self.win.getyx()
        backyx = None
        while y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if not self.insert_mode or not curses.ascii.isprint(oldch):
                break
            ch = oldch
            (y, x) = self.win.getyx()
            # Remember where to put the cursor back since we are in insert_mode
            if backyx is None:
                backyx = y, x

        if backyx is not None:
            self.win.move(*backyx)

    def do_command(self, ch):
        "Process a single editing command."
        self._update_max_yx()
        (y, x) = self.win.getyx()
        self.lastcmd = ch
        if curses.ascii.isprint(ch):
            if y < self.maxy or x < self.maxx:
                self._insert_printable_char(ch)
        elif ch == curses.ascii.SOH:                           # ^a
            self.win.move(y, 0)
        elif ch in (curses.ascii.STX,curses.KEY_LEFT, curses.ascii.BS,curses.KEY_BACKSPACE):
            if x > 0:
                self.win.move(y, x-1)
            elif y == 0:
                pass
            elif self.stripspaces:
                self.win.move(y-1, self._end_of_line(y-1))
            else:
                self.win.move(y-1, self.maxx)
            if ch in (curses.ascii.BS, curses.KEY_BACKSPACE):
                self.win.delch()
        elif ch == curses.ascii.EOT:                           # ^d
            self.win.delch()
        elif ch == curses.ascii.ENQ:                           # ^e
            if self.stripspaces:
                self.win.move(y, self._end_of_line(y))
            else:
                self.win.move(y, self.maxx)
        elif ch in (curses.ascii.ACK, curses.KEY_RIGHT):       # ^f
            if x < self.maxx:
                self.win.move(y, x+1)
            elif y == self.maxy:
                pass
            else:
                self.win.move(y+1, 0)
        elif ch == curses.ascii.BEL:                           # ^g
            return 0
        elif ch == curses.ascii.NL:                            # ^j
            if self.maxy == 0:
                return 0
            elif y < self.maxy:
                self.win.move(y+1, 0)
        elif ch == curses.ascii.VT:                            # ^k
            if x == 0 and self._end_of_line(y) == 0:
                self.win.deleteln()
            else:
                # first undo the effect of self._end_of_line
                self.win.move(y, x)
                self.win.clrtoeol()
        elif ch == curses.ascii.FF:                            # ^l
            self.win.refresh()
        elif ch in (curses.ascii.SO, curses.KEY_DOWN):         # ^n
            if y < self.maxy:
                self.win.move(y+1, x)
                if x > self._end_of_line(y+1):
                    self.win.move(y+1, self._end_of_line(y+1))
        elif ch == curses.ascii.SI:                            # ^o
            self.win.insertln()
        elif ch in (curses.ascii.DLE, curses.KEY_UP):          # ^p
            if y > 0:
                self.win.move(y-1, x)
                if x > self._end_of_line(y-1):
                    self.win.move(y-1, self._end_of_line(y-1))
        return 1

    def gather(self):
        "Collect and return the contents of the window."
        result = ""
        self._update_max_yx()
        for y in range(self.maxy+1):
            self.win.move(y, 0)
            stop = self._end_of_line(y)
            if stop == 0 and self.stripspaces:
                continue
            for x in range(self.maxx+1):
                if self.stripspaces and x > stop:
                    break
                result = result + chr(curses.ascii.ascii(self.win.inch(y, x)))
            if self.maxy > 0:
                result = result + "\n"
        return result

    def edit(self, validate=None):
        "Edit in the widget window and collect the results."
        while 1:
            ch = self.win.getch()
            if validate:
                ch = validate(ch)
            if not ch:
                continue
            if not self.do_command(ch):
                break
            self.win.refresh()
        return self.gather()

if __name__ == '__main__':
    def test_editbox(stdscr):
        ncols, nlines = 9, 4
        uly, ulx = 15, 20
        stdscr.addstr(uly-2, ulx, "Use Ctrl-G to end editing.")
        win = curses.newwin(nlines, ncols, uly, ulx)
        rectangle(stdscr, uly-1, ulx-1, uly + nlines, ulx + ncols)
        stdscr.refresh()
        return Textbox(win).edit()

    str = curses.wrapper(test_editbox)
    print('Contents of text box:', repr(str))

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Web Design for Beginners | Anyleson - Learning Platform
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Web Design for Beginners

Web Design for Beginners

in Design
Created by Linda Anderson
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Course Published
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Course
Web Design for Beginners
in Design
4.25
1:45 Hours
8 Jul 2021
₹11.80

What you will learn?

Create any website layout you can imagine

Support any device size with Responsive (mobile-friendly) Design

Add tasteful animations and effects with CSS3

Course description

You can launch a new career in web development today by learning HTML & CSS. You don't need a computer science degree or expensive software. All you need is a computer, a bit of time, a lot of determination, and a teacher you trust. I've taught HTML and CSS to countless coworkers and held training sessions for fortune 100 companies. I am that teacher you can trust. 


Don't limit yourself by creating websites with some cheesy “site-builder" tool. This course teaches you how to take 100% control over your webpages by using the same concepts that every professional website is created with.


This course does not assume any prior experience. We start at square one and learn together bit by bit. By the end of the course you will have created (by hand) a website that looks great on phones, tablets, laptops, and desktops alike.


In the summer of 2020 the course has received a new section where we push our website live up onto the web using the free GitHub Pages service; this means you'll be able to share a link to what you've created with your friends, family, colleagues and the world!

Requirements

No prerequisite knowledge required

No special software required

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