| [9] | 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <?xml-stylesheet type="text/css"
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| 3 | href="eclipseos2-xxe.css"
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| 4 | ?>
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| 5 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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| 6 | "xhtml1-strict.dtd">
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| 7 | <html>
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| 8 | <head>
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| 9 | <link type="text/css"
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| 10 | href="eclipseos2.css"
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| 11 | rel="stylesheet" />
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| 12 |
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| 13 | <title>Eclipse for OS/2 Transitional Project Notes</title>
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| 14 | </head>
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| 15 |
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| 16 | <body>
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| 17 | <h1>SWT Step 1. Initial moves</h1>
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| 18 |
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| 19 | <h2>Objective</h2>
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| 20 |
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| 21 | <p>Start our work by setting up a working environment (cvs) and creating a
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| 22 | skeleton of the SWT with the least possible functionality, that can be
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| 23 | successfully compiled and tested with the simplest dummy example (creation
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| 24 | of the <code>Display</code> object).</p>
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| 25 |
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| 26 | <h2>Task notes</h2>
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| 27 |
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| 28 | <p>The one of the basics of SWT is <code>o.e.swt.widgets.Display</code>
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| 29 | class that represents an SWT session. It represents a connection between
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| 30 | SWT an the underlying platform's GUI and manages the platform event
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| 31 | loop. It is created by the application's main thread (UI thread) which
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| 32 | runs the event loop and dispatches events directly from it. Every (?) SWT
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| 33 | program creates a <code>Display</code> object so it's a good place to
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| 34 | begin. The minimum functionality to implement is the message queue
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| 35 | creation/deletion, <code>readAndDispatch()</code> method and <code>internal_new_GC()</code>,
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| 36 | <code>intermal_dispose_GC()</code> methods (including their native
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| 37 | representations) which leads to a partial implementation of <code>o.e.swt.OS</code>
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| 38 | class and also few others (see checklist). All other stuff should be
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| 39 | temporarily commented. Of course, without any visible window (which is
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| 40 | represented by the <code>Shell</code> class) we cannot get keyboard and
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| 41 | mouse messages from the system but there should be a couple of system
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| 42 | events that we can get and write their info to the log file. As a criteria
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| 43 | of the step completion will be a simplified SWT example <kbd>HelloWorld1</kbd>
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| 44 | (with the <code>Shell</code> code ripped off).</p>
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| 45 |
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| 46 | <h2>Step checklist</h2>
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| 47 |
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| 48 | <table>
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| 49 | <col width="40%" />
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| 50 |
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| 51 | <col />
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| 52 |
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| 53 | <col width="50%" />
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| 54 |
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| 55 | <thead>
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| 56 | <tr>
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| 57 | <th>Operation</th>
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| 58 |
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| 59 | <th>Status</th>
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| 60 |
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| 61 | <th>Remarks</th>
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| 62 | </tr>
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| 63 | </thead>
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| 64 |
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| 65 | <tr>
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| 66 | <td>Create the initial directory structure in cvs, initially checkin
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| 67 | common SWT parts as <kbd>rel-2-0-1</kbd> on the <kbd>eclipse-team</kbd>
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| 68 | branch</td>
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| 69 |
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| 70 | <td>Done [dmik]</td>
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| 71 |
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| 72 | <td>Common native C code from [Base] (<kbd>\src\plugins\org.eclipse.swt\Eclipse
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| 73 | SWT\common\library</kbd>) and <code>o.e.swt.internal.Library</code>
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| 74 | [PI] are checked in.</td>
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| 75 | </tr>
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| 76 |
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| 77 | <tr>
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| 78 | <td>Include <code>o.e.swt.Drawable</code> [Base] in compilation</td>
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| 79 |
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| 80 | <td>Done [dmik]</td>
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| 81 |
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| 82 | <td></td>
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| 83 | </tr>
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| 84 |
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| 85 | <tr>
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| 86 | <td>Add <code>o.e.swt.graphics.<b>Device, DeviceData, GCData</b></code>
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| 87 | [Base] and comment all unnecessary parts</td>
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| 88 |
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| 89 | <td>Done [dmik]</td>
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| 90 |
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| 91 | <td><br /></td>
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| 92 | </tr>
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| 93 |
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| 94 | <tr>
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| 95 | <td>Create <code>o.e.swt.internal.pm.<b>QMSG</b></code> [PI]</td>
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| 96 |
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| 97 | <td>Done [eli]</td>
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| 98 |
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| 99 | <td><a href="swt.html#o.e.swt.internal.pm.QMSG">[QMSG]</a></td>
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| 100 | </tr>
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| 101 |
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| 102 | <tr>
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| 103 | <td>Create <code>o.e.swt.internal.pm.<b>MPARAM</b></code> [PI]</td>
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| 104 |
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| 105 | <td>Done [eli]</td>
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| 106 |
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| 107 | <td>Now it's uncomplete and not used.</td>
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| 108 | </tr>
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| 109 |
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| 110 | <tr>
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| 111 | <td>Create <code>o.e.swt.internal.pm.<b>POINTL</b></code> [PI]</td>
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| 112 |
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| 113 | <td>Done [eli]</td>
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| 114 |
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| 115 | <td>Now it's not used.</td>
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| 116 | </tr>
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| 117 |
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| 118 | <tr>
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| 119 | <td>Add <code>o.e.swt.widgets.<b>Display</b></code> [PI] and comment
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| 120 | unnecessary parts</td>
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| 121 |
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| 122 | <td>Done [dmik]</td>
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| 123 |
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| 124 | <td></td>
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| 125 | </tr>
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| 126 |
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| 127 | <tr>
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| 128 | <td>Create <code>o.e.swt.internal.pm.<b>OS</b></code> [PI]</td>
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| 129 |
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| 130 | <td>Done [dmik]</td>
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| 131 |
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| 132 | <td></td>
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| 133 | </tr>
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| 134 |
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| 135 | <tr>
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| 136 | <td>Port <code>o.e.swt.internal.Library</code> [PI]</td>
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| 137 |
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| 138 | <td>Done [dmik]</td>
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| 139 |
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| 140 | <td>OS/2 (or Java under OS/2) is unable to handle DLL files with long
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| 141 | names, only 8.3 format is allowed (see Q&A #2). So, SWT DLL file
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| 142 | name will be constructed as <kbd>swtpNNNN.dll</kbd> (where NNNN is the
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| 143 | SWT version number). Revision number will be ignored.</td>
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| 144 | </tr>
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| 145 |
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| 146 | <tr>
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| 147 | <td>Create dummy (empty) C natives [PI], port <kbd>callback.h</kbd>
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| 148 | [Base] and setup VAC4 compilation</td>
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| 149 |
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| 150 | <td>Done [dmik]</td>
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| 151 |
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| 152 | <td>At this moment the build of natives is done by <kbd>\src\plugins\org.eclipse.swt\Eclipse
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| 153 | SWT PI\pm\library\build.cmd</kbd> (later will be called from the main
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| 154 | build file). The native callback stuff seems to be compiled ok. Not
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| 155 | properly tested, but <code>o.e.swt.SWT.getPlatform()</code> (that uses
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| 156 | <code>o.e.swt.internal.Callback.getPlatform()</code>) works.</td>
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| 157 | </tr>
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| 158 |
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| 159 | <tr>
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| 160 | <td>Implement <code>OS.WinAlarm()</code> (<kbd>swt.c</kbd>) as an
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| 161 | example of native mappings and <code>OS.WA_*</code> constants for it;
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| 162 | implement <code>Display.beep()</code></td>
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| 163 |
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| 164 | <td>Done [dmik]</td>
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| 165 |
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| 166 | <td>This is an analogue of Win32's <code>MessageBeep()</code>. <a
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| 167 | href="swt.html#o.e.swt.internal.pm.OS.WinAlarm">[WinAlarm]</a> (see
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| 168 | Q&A #6).</td>
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| 169 | </tr>
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| 170 |
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| 171 | <tr>
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| 172 | <td>Add <code>OS.HWND_DESKTOP</code> (=1) and <code>OS.NULLHANDLE</code>
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| 173 | (=0) constants.</td>
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| 174 |
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| 175 | <td>Done [dmik]</td>
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| 176 |
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| 177 | <td>See Q&A #6.</td>
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| 178 | </tr>
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| 179 |
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| 180 | <tr>
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| 181 | <td>Implement <code>OS.WinGetLastError()</code> for debugging purposes</td>
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| 182 |
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| 183 | <td>Done [dmik]</td>
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| 184 |
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| 185 | <td></td>
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| 186 | </tr>
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| 187 |
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| 188 | <tr>
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| 189 | <td>Add <code>Display.hab</code> field (together with <code>hmq</code>)
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| 190 | and add its initialization and cleanup (<code>OS.WinInitialize()</code>
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| 191 | and <code><code>OS</code>.WinTerminate()</code>, <code><code>OS</code>.WinCreateMsgQueue()</code>
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| 192 | and <code><code>OS</code>.WinDestroyMsgQueue()</code>) to
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| 193 | <code>init()</code> and <code>release()</code> (actually <code>releaseDisplay()</code>)
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| 194 | methods</td>
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| 195 |
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| 196 | <td>Done [dmik]</td>
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| 197 |
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| 198 | <td>See O&A #7. An attempt to create a msg queue in the program
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| 199 | started by <kbd>java.exe</kbd> will lead to <code>PMERR_NOT_IN_A_PM_SESSION</code>
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| 200 | (0x1051) error. Execution under <kbd>javaw.exe</kbd> is ok => see
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| 201 | O&A #8.</td>
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| 202 | </tr>
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| 203 |
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| 204 | <tr>
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| 205 | <td>Implement <code>OS.DosGetInfoBlocks()</code> to make it possible
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| 206 | to get the current thread and process id and create wrapper classes
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| 207 | for the corresponding structures: <code>o.e.swt.internal.pm.<b>TIB</b></code>,
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| 208 | <code>o.e.swt.internal.pm.<b>TIB2</b></code>, <code>o.e.swt.internal.pm.<b>PIB</b></code>,
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| 209 | and getters/setters for them (<kbd>structs.h</kbd>/<kbd>structs.c</kbd>).</td>
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| 210 |
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| 211 | <td>Done [dmik]</td>
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| 212 |
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| 213 | <td>Curently, <code>PIB.pib_pchcmd</code> and <code>PIB.pib_pchenv</code>
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| 214 | are not implemented. <br /><b>Note</b>: Useful information about the
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| 215 | implementation of native methods can be found <a
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| 216 | href="swt.html#native.methods">here</a>.</td>
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| 217 | </tr>
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| 218 |
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| 219 | <tr>
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| 220 | <td>Change <code>OS.DosGetInfoBlocks()</code> implementation.</td>
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| 221 |
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| 222 | <td>Done [dmik]</td>
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| 223 |
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| 224 | <td>Since <code>DosGetInfoBlocks()</code>returns pointers to its
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| 225 | internal data rather than fills structures provided by the caller and
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| 226 | since we need the direct access to that data from Java, it will be
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| 227 | more "native" and useful to change arguments of the wrapper to
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| 228 | arrays of int with one element to return this pointers to Java caller
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| 229 | and then use <code>OS.objcpy</code> to excahge data between the memory
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| 230 | they point to and Java TIB/PIB structure wrappers.</td>
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| 231 | </tr>
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| 232 |
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| 233 | <tr>
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| 234 | <td>Implement <code>OS.DosQuerySysInfo()</code> and <code>OS.QSV_*</code>
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| 235 | constants to get the OS/2 version and revision, define <code>OS.IsWarp3</code>,
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| 236 | <code>OS.IsWarp4</code>, <code>OS.IsAurora</code> constants.</td>
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| 237 |
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| 238 | <td>Done [dmik]</td>
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| 239 |
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| 240 | <td></td>
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| 241 | </tr>
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| 242 |
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| 243 | <tr>
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| 244 | <td>Implement <code>OS.PSZ</code> wrapper and C helpers for it to
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| 245 | handle ASCIIZ strings.</td>
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| 246 |
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| 247 | <td>Done [dmik]</td>
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| 248 |
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| 249 | <td>See <a href="swt.html#native.methods">conventions</a> about ASCIIZ
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| 250 | strings.</td>
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| 251 | </tr>
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| 252 |
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| 253 | <tr>
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| 254 | <td>Finish the preliminary <code>Display</code> imlementation to get a
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| 255 | working message queue and add the following <code>OS</code> natives
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| 256 | for this:<ul><li><code>WinRegisterClass</code> (and <code>CS_* </code>constants)</li><li><code>WinCreateWindow
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| 257 | </code>(and <code>WS_* </code>constants)</li><li><code>WinDestroyWindow</code></li><li><code>WinDefWinProc</code></li><li><code>WinPeekMsg</code></li><li><code>WinDispatchMsg</code></li><li><code>WinPostQueueMsg</code></li><li><code>WinWaitMsg</code></li></ul>Also
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| 258 | include some common classes in compilation (see <kbd>classes.inc</kbd>).</td>
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| 259 |
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| 260 | <td>Done [dmik]</td>
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| 261 |
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| 262 | <td>The last objective in the test example (<kbd>SWT001.java</kbd>)
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| 263 | shows the same behavior as its C equvivalent. Nonvisible message-only
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| 264 | window receives <code>WM_CREATE</code> upon creation, then
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| 265 | <code>WM_ADJUSTWINDOWPOS</code>, then a locale message, then the
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| 266 | message loop terminates and the window receives a <code>WM_CLOSE</code>
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| 267 | message upon destroying. This behavior does not depend on whether the
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| 268 | test is run in PM mode or in VIO. Everything seems to be working
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| 269 | correctly.</td>
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| 270 | </tr>
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| 271 | </table>
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| 272 | </body>
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| 273 | </html>
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