183 lines
7.7 KiB
HTML
183 lines
7.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Using Window Services APIs</title>
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<!-- Begin Header Records ========================================= -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<!-- DSMMST1 SCRIPT A converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 29 Jan 1999 at 16:05:09 -->
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<!-- File Edited November 2001 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>Using Window Services APIs</h2>
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<p>A window is created using a window and a low-level environment description.
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The window description provides the window attributes, a pointer to data that
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is specified by the using application, and several exit routines that the
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window module calls when a window is moved, resized, or deleted so the using
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program can perform the appropriate actions. The low-level environment
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description is the same as that used on the Create Low-Level Environment
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(QsnCrtEnv) API to create a low-level environment. A window is implemented as a
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low-level environment where the user data pointer describes the window itself.
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Thus, a window can be manipulated through the low-level APIs or through the
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window APIs by using the same window handle. This implementation is similar to
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the concept of inheritance in object-oriented programming languages. DSM window
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support uses graphical user interface (GUI) when the underlying control unit
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supports it.</p>
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<p>Each window has the low-level environment window mode enabled. The low-level
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environment window area is set to the usable area in the window, which consists
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of the area inside the border and attributes that can be accessed by screen I/O
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services. (It does not include the message line.) Use relative coordinates when
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specifying a row and column on an I/O API. The upper left corner of the usable
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area is (1,1). To use absolute coordinates with a window, disable the low-level
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environment window mode with the Set Low-Level Environment Window Mode
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(QsnSetEnvWinMod) API.</p>
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<p><a href="#FIGWINPIC1">Figure 1</a> shows the components of a DSM window.
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The window in this example has a specified depth of 13 rows and a width of 19
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columns.</p>
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<p>The attributes of a DSM window are similar to those of a data description
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specifications (DDS) window. The initial size and location of a DSM window are
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specified using the location of the upper-left window border character and the
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number of rows and columns within the window. For DSM windows, the leading
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window attribute, right continuation attribute, or message line can be
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specified separately. Unlike a DDS window, a DSM window does not require the
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following:</p>
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<ul>
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<li>A border
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<p>If a window is defined with no border, no extra space is used on the display
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for the border characters or their attributes (L and B in <a href=
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"#FIGWINPIC1">Figure 1</a>). An area of the screen is cleared starting from
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the specified location for the upper left corner of the window and continues
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for the number of rows and columns given as the window size. <a href=
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"#FIGWINPIC4">Figure 2</a> shows an example of a window with no border.</p>
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<p><strong>Note:</strong> In discussions throughout the DSM sections that refer
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to window borders, this should be taken to mean the top/bottom window row or
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left/right window column for a window with no borders.</p>
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</li>
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<li>Window border attributes
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<p>If a window is defined with no border attributes (L and B in <a href=
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"#FIGWINPIC1">Figure 1</a>), no extra space for these is used on the display.
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<a href="#FIGWINPIC2">Figure 3</a> shows a window with no border
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attributes.</p>
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</li>
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<li>Leading window attribute
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<p>The leading window attribute (A in <a href="#FIGWINPIC1">Figure 1</a>) is
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part of the addressable window area. If specified, this attribute takes up an
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extra screen character and does not reduce the size of the window area. <a
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href="#FIGWINPIC3">Figure 4</a> shows a window defined with no leading window
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attribute. The window text directly follows the window border character.
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Attribute characters can be written inside the window if desired.</p>
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</li>
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<li>Right continuation attribute
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<p>If the right continuation attribute (R in <a href="#FIGWINPIC1">Figure
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1</a>) is specified on a window description, DSM determines the appropriate
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attribute to use, based on the screen image underlying the window. If the
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window is not a GUI window, right-continuation-attribute correction is
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performed for display-screen and presentation screen DBCS-only attributes. (No
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correction is performed for extended primary attributes and DBCS data types).
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When a window is placed on a screen that supports extended attributes, all
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extended attributes are cleared prior to displaying the window. To have the
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right continuation attribute handle extended attributes, you must use a display
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that supports GUI windows and specify GUI window support on the window
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description.</p>
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</li>
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<li>Message line
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<p>Specifying a message line on a window description decreases the number of
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lines in the window area by 1, as shown in Figure 1.
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</li>
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</ul>
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<p><strong><em><a name="FIGWINPIC1">Figure 1. DSM Window Layout</a></em></strong></p>
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<p><img src="RBAFX647.gif" alt="DSM Window Layout"></p>
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<table cellpadding="2">
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<tr>
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<th align="left" valign="top">Key</th>
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<th align="left" valign="top"> </th>
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</tr>
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<tr>
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<td align="left" valign="top"><em>L</em></td>
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<td align="left" valign="top">Left border attribute</td>
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</tr><tr>
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<td align="left" valign="top"><em>.</em></td>
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<td align="left" valign="top">Top and bottom border</td>
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</tr><tr>
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<td align="left" valign="top"><em>R</em></td>
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<td align="left" valign="top">Right continuation attribute</td>
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</tr><tr>
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<td align="left" valign="top"><em>:</em></td>
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<td align="left" valign="top">Left and right border</td>
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</tr><tr>
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<td align="left" valign="top"><em>A</em></td>
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<td align="left" valign="top">Leading window attribute</td>
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</tr><tr>
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<td align="left" valign="top"><em>w</em></td>
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<td align="left" valign="top">Window area</td>
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</tr><tr>
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<td align="left" valign="top"><em>m</em></td>
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<td align="left" valign="top">Message line</td>
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</tr><tr>
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<td align="left" valign="top"><em>B</em></td>
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<td align="left" valign="top">Right border attribute</td>
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</tr></table>
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<p><strong><em><a name="FIGWINPIC4">Figure 2. DSM Window with No
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Border</a></em></strong></p>
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<p><img src="RBAFX648.gif" alt="DSM Window with No Border"></p>
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<p><strong><em><a name="FIGWINPIC2">Figure 3. DSM Window with No Border
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Attributes</a></em></strong></p>
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<p><img src="RBAFX649.gif" alt="DSM Window with No Border Attributes"></p>
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<p><strong><a name="FIGWINPIC3">Figure 4. DSM Window with No Leading Window
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Attribute</a></strong></p>
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<p><img src="RBAFX650.gif" alt="DSM Window with No Leading Window Attribute"></p>
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"dsm.htm">Dynamic Screen Manager APIs</a> | <a href="aplist.htm">APIs by
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category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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