📄 slide022.html

📁 《Big C++ 》Third Edition电子书和代码全集-Part1

💻 HTML

字号:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
	<meta content="blendTrans(Duration=2)" http-equiv="Page-Enter">
	<title>Big C++: Chptr. 27 -- Graphical User Interfaces</title>
	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
  <meta name="Copyright" content="2005 John Wiley & Sons">
  <meta name="Author" content="Kurt Schmidt">
</head>


<body>
<div onclick="document.location='slide023.html'">
<h2><font color='#009999'>27.7 Painting</font></h2>
<ul>
  <li><font size="+1">Drawing images in a windowing environment is not quite as 
    straightforward as you might think.</font> 
    <ul>
      <li><font size="+1">What happens when a user re-sizes the window? ... minimizes 
        the window? ... restores the window?</font></li>
      <li><font size="+1">What happens when another frame pops up over the image 
        and then vanishes?</font></li>
    </ul>
  </li>
  <li><font size="+1">The program has no idea when these events will happen.</font></li>
  <li><font size="+1">When they do happen, the window manager knows the contents 
    of the window have been corrupted and sends a paint event to the program.</font></li>
  <li><font size="+1">The program needs to draw the image not just once, but <i>every 
    time a paint even occurs</i>.</font></li>
  <li><font size="+1">All drawing instructions must be placed into a function 
    that is is the target of paint events. 
    <blockquote><pre>EVT_PAINT(EllipseWindow::OnPaint)</pre></blockquote></font></li>
</ul>
<hr>
<center><small>
	<a href='slide021.html'>prev</a>
	|<a href='slide001.html'>top</a>
	|<a href='slide023.html'>next</a>
</small></center>
</div>
</body>
</html>

⌨️ 快捷键说明

复制代码 Ctrl + C

搜索代码 Ctrl + F

全屏模式 F11

切换主题 Ctrl + Shift + D

显示快捷键 ?

增大字号 Ctrl + =

减小字号 Ctrl + -