我在设置CRUD服务时遇到麻烦，可以调用该服务来设置和获取2个组件之间的特定值...
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export class ChangeService {
colour: Subject<string>;
constructor() {
this.colour = new Subject();
}
changeColour(colour: string) {
// this is where the TS error is thrown
this.colour = colour;
}
getColour(): Observable<any> {
return this.colour;
}
}
答案 0 :(得分：1)
您应该使用#!/usr/bin/env python3
# file: far.py
# vim:fileencoding=utf-8:fdm=marker:ft=python
#
# Copyright © 2018 R.F. Smith <rsmith@xs4all.nl>.
# SPDX-License-Identifier: MIT
# Created: 2018-02-27T23:38:17+0100
# Last modified: 2018-04-17T00:11:57+0200
from tkinter import filedialog
from tkinter import ttk
from tkinter.font import nametofont
import argparse
import os
import shutil
import sys
import tkinter as tk
__version__ = '0.1'
class FarUI(tk.Tk):
def __init__(self, rootdir='', findname='', replacement=''):
tk.Tk.__init__(self, None)
self.running = False
self.finditer = None
self.create_window()
self.tree['text'] = rootdir
self.find.insert(0, findname)
self.replace['text'] = replacement
def create_window(self):
"""Create the GUI"""
# Set the font.
default_font = nametofont("TkDefaultFont")
default_font.configure(size=12)
self.option_add("*Font", default_font)
# General commands and bindings
self.bind_all('q', self.quit_cb)
self.wm_title('Find and Replace v' + __version__)
self.columnconfigure(4, weight=1)
self.rowconfigure(4, weight=1)
# First row
ftxt = ttk.Label(self, text='Find:')
ftxt.grid(row=0, column=0, sticky='w')
fe = ttk.Entry(self, justify='left')
fe.grid(row=0, column=1, columnspan=4, sticky='ew')
self.find = fe
# Second row
treetxt = ttk.Label(self, text='In tree:')
treetxt.grid(row=1, column=0, sticky='w')
te = ttk.Label(self, justify='left')
te.grid(row=1, column=1, columnspan=4, sticky='ew')
tb = ttk.Button(self, text="browse...", command=self.tree_cb)
tb.grid(row=1, column=5, columnspan=2, sticky='ew')
self.tree = te
# Third row
reptxt = ttk.Label(self, text='Replace with:')
reptxt.grid(row=2, column=0, sticky='w')
re = ttk.Label(self, justify='left')
re.grid(row=2, column=1, columnspan=4, sticky='ew')
rb = ttk.Button(self, text="browse...", command=self.replace_cb)
rb.grid(row=2, column=5, columnspan=2, sticky='ew')
self.replace = re
# Fourth row
run = ttk.Button(self, text="run", command=self.start_replace_cb)
run.grid(row=3, column=0, sticky='ew')
stop = ttk.Button(self, text="stop", command=self.stop_replace_cb, state=tk.DISABLED)
stop.grid(row=3, column=1, sticky='w')
self.runbutton = run
self.stopbutton = stop
qb = ttk.Button(self, text="quit", command=self.destroy)
qb.grid(row=3, column=2, sticky='w')
ttk.Label(self, justify='left', text='Progress: ').grid(row=3, column=3, sticky='w')
progress = ttk.Label(self, justify='left', text='None')
progress.grid(row=3, column=4, columnspan=2, sticky='ew')
self.progress = progress
# Fifth row
message = tk.Text(self, height=4)
message.grid(row=4, column=0, columnspan=6, sticky='nsew')
s = ttk.Scrollbar(self, command=message.yview)
s.grid(row=4, column=6, sticky='nse')
message['yscrollcommand'] = s.set
self.message = message
def quit_cb(self, event):
"""
Callback to handle quitting.
This is necessary since the quit method does not take arguments.
"""
self.running = False
self.quit()
def tree_cb(self):
rootdir = filedialog.askdirectory(
parent=self, title='Directory where to start looking', mustexist=True
)
self.tree['text'] = rootdir
def replace_cb(self):
replacement = filedialog.askopenfilename(parent=self, title='Replacement file')
self.replace['text'] = replacement
def start_replace_cb(self):
rootdir = self.tree['text']
filename = self.find.get()
replacement = self.replace['text']
if self.running or not rootdir or not filename or not replacement:
self.message.delete('1.0', tk.END)
self.message.insert(tk.END, 'Missing data!')
return
self.running = True
self.message.delete('1.0', tk.END)
self.message.insert(tk.END, 'Starting replacement\n')
self.runbutton['state'] = tk.DISABLED
self.stopbutton['state'] = tk.NORMAL
self.finditer = os.walk(rootdir)
self.after(1, self.replace_step)
def replace_step(self):
if not self.running:
return
try:
path, _, files = self.finditer.send(None)
rootlen = len(self.tree['text']) + 1
# Skip known revision control systems directories.
for skip in ('.git', '.hg', '.svn', '.cvs', '.rcs'):
if skip in path:
self.progress['text'] = 'skipping ' + path[rootlen:]
return
if len(path) > rootlen and path[rootlen] != '.':
self.progress['text'] = 'processing ' + path[rootlen:]
filename = self.find.get()
if filename in files:
original = path + os.sep + filename
replacement = self.replace['text']
repfile = os.path.basename(replacement)
dest = path + os.sep + repfile
self.message.insert(tk.END, "Removing '{}'\n".format(original))
os.remove(original)
self.message.insert(tk.END, "Copying '{}' to '{}'\n".format(replacement, dest))
shutil.copy2(replacement, dest)
self.after(1, self.replace_step)
except StopIteration:
self.stop()
self.message.insert(tk.END, 'Finished replacement.\n')
def stop(self):
self.running = False
self.finditer = None
self.runbutton['state'] = tk.NORMAL
self.stopbutton['state'] = tk.DISABLED
self.progress['text'] = 'None'
def stop_replace_cb(self):
self.stop()
self.message.insert(tk.END, 'Replacement stopped by user.\n')
def main():
"""Main entry point for far.py"""
# Parse the arguments.
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
'-d', '--rootdir', type=str, default=os.getcwd(), help='Directory to start looking in.'
)
parser.add_argument('-f', '--findname', type=str, default='', help='Name of the file to find.')
parser.add_argument(
'-r', '--replacement', type=str, default='', help='Path of the replacement file.'
)
parser.add_argument('-v', '--version', action='version', version=__version__)
args = parser.parse_args(sys.argv[1:])
if not args.rootdir.startswith(os.sep):
args.rootdir = os.getcwd() + os.sep + args.rootdir
# Create the UI.
root = FarUI(args.rootdir, args.findname, args.replacement)
root.mainloop()
if __name__ == '__main__':
# Detach from the terminal on POSIX systems.
if os.name == 'posix':
if os.fork():
sys.exit()
# Run the program.
main()
并在其上调用BehaviorSubject方法。
next要获得颜色，您只需在组件类中订阅export class ChangeService {
colour: BehaviorSubject<string> = new BehaviorSubject<string>(null);
changeColour(colour: string) {
this.colour.next(colour);
}
}
。
colour答案 1 :(得分：0)
您应该使用BehaviorSubject并在其上调用next方法。
export class ChangeService {
colour: BehaviorSubject<string> = new BehaviorSubject<string>(null);
changeColour(colour: string) {
this.colour.next(colour);
}
}
// To get the color you can simply subscribe to `colour`