Question

我试图在Python 3中使用tkinter创建一个简单的移动块，一切正常，直到我导入时间。窗口现在无法打开。我已经尝试删除导入，但它没有帮助。这是我的代码：

from tkinter import *
import time

canvas_height = 400
canvas_width = 600
canvas_colour = "grey50"
moveBoolean = "True"

def move():
    global moveBoolean
    while moveBoolean == "True":
        time.sleep(0.005)
        canvas.move(square, 90, 90)
        time.sleep(0.005)
        canvas.move(square, 180, 180)
        time.sleep(0.005)
        canvas.move(square, 50, 100)

window = Tk()

canvas = Canvas(bg=canvas_colour, height=canvas_height, width=canvas_width, highlightthickness=0)
canvas.pack()

square = canvas.create_rectangle(50, 50, 50, 50, width=50, fill="black")

move()

window.mainloop()

Answer 1

这些问题通常通过使用类来解决，您应该在编写GUI恕我直言之前学习和使用这些类。你不应该使用time（），因为它可以中断无限的Tkinter循环。改为使用Tkinter的after（）。此外，您永远不会将moveBoolean设置为False，因此while语句会一直运行，直到程序被取消，第二次通过square将不在画布上，这就是为什么你没有得到任何可见的东西。以下内容可以解决您的问题，但如果使用类结构则会更好。

    <?php
error_reporting(0);
include('../includes/header.php');
include('connection.php');
?>


<script src="../jqm/demos/js/jquery.js"></script>
<script type="text/javascript">

var db;
    $(document).ready(function () {
    loadJobRecords();    
    }

$(document).on("click", "#jobRecord", function () {
     getJobById($(this).data("key"));
    });
    });

function loadJobRecords() {
    db.transaction(function (txs) {
        txs.executeSql('SELECT * FROM jobs', [], function (txs, results) {
            var len = results.rows.length, i;
                 for (i = 0; i < len; i++) {
                     var JobRecord = results.rows.item(i);

                     var individualJob = '';
                     individualJob = '<li><a href="#detailinfo" id="jobRecord" data-key="' + jobRecord.ID + '" >';
                     individualJob += '<h3>' + jobRecord.Title + '</h3>';
                     individualJob += '<p>Testing</p>';
                     individualJob += '</a></li>';

                     $('#listofjobs ul').append(individualJob);
                     $('#listofjobs ul:visible').listview('refresh');
                 }
             });
         });
 }

    function getJobById(id) {

         db.transaction(function (txs) {
             txs.executeSql('SELECT * FROM jobs WHERE id="' + ID + '"', [], function (txs, results) '){
                var len = results.rows.length, i;

                 for (i = 0; i < len; i++) {
                     var jobRecord = results.rows.item(i);
                     var individualjob = '';
                     individualjob += '<h3>' + jobRecord.Title + '</h3>';
                     individualjob += '<p>' + jobRecord.Description + '</p>';
                     individualjob += '<p>' + jobRecord.Username + '</p>';

                     $('#jobSummary').html(individualJob); 
                 } 
             });
         });
     }    

</script>

    <div class="content container">
    <div daa-role="page" id="jobsdatabase">
        <section>
    <div data-role="content" id="listofjobs">               
        <ul data-role="listview" data-filter="true" data-inset="true">

         </ul>
        </section>
    </div>
    </div>
    </div>

<?php include('../includes/footer.php'); ?>

Tkinter窗口无法打开

1 个答案: