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| 2 | <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qevent.cpp:1761 -->
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| 6 | <title>QIMEvent Class</title>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QIMEvent Class Reference</h1>
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| 33 |
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| 34 | <p>The QIMEvent class provides parameters for input method events.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt>
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| 37 | <p>Inherits <a href="qevent.html">QEvent</a>.
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| 38 | <p><a href="qimevent-members.html">List of all member functions.</a>
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| 39 | <h2>Public Members</h2>
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| 40 | <ul>
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| 41 | <li class=fn><a href="#QIMEvent"><b>QIMEvent</b></a> ( Type type, const QString & text, int cursorPosition )</li>
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| 42 | <li class=fn>const QString & <a href="#text"><b>text</b></a> () const</li>
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| 43 | <li class=fn>int <a href="#cursorPos"><b>cursorPos</b></a> () const</li>
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| 44 | <li class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</li>
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| 45 | <li class=fn>void <a href="#accept"><b>accept</b></a> ()</li>
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| 46 | <li class=fn>void <a href="#ignore"><b>ignore</b></a> ()</li>
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| 47 | <li class=fn>int <a href="#selectionLength"><b>selectionLength</b></a> () const</li>
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| 48 | </ul>
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| 49 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 50 |
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| 51 |
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| 52 | The QIMEvent class provides parameters for input method events.
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| 53 | <p>
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| 54 | <p> Input method events are sent to widgets when an input method is
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| 55 | used to enter text into a widget. Input methods are widely used to
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| 56 | enter text in Asian and other complex languages.
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| 57 | <p> The events are of interest to widgets that accept keyboard input
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| 58 | and want to be able to correctly handle complex languages. Text
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| 59 | input in such languages is usually a three step process.
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| 60 | <p> <ol type=1>
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| 61 | <li> <b>Starting to Compose</b><br>
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| 62 | When the user presses the first key on a keyboard an input context
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| 63 | is created. This input context will contain a string with the
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| 64 | typed characters.
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| 65 | <p> <li> <b>Composing</b><br>
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| 66 | With every new key pressed, the input method will try to create a
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| 67 | matching string for the text typed so far. While the input context
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| 68 | is active, the user can only move the cursor inside the string
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| 69 | belonging to this input context.
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| 70 | <p> <li> <b>Completing</b><br>
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| 71 | At some point, e.g. when the user presses the Spacebar, they get
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| 72 | to this stage, where they can choose from a number of strings that
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| 73 | match the text they have typed so far. The user can press Enter to
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| 74 | confirm their choice or Escape to cancel the input; in either case
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| 75 | the input context will be closed.
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| 76 | </ol>
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| 77 | <p> Note that the particular key presses used for a given input
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| 78 | context may differ from those we've mentioned here, i.e. they may
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| 79 | not be Spacebar, Enter and Escape.
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| 80 | <p> These three stages are represented by three different types of
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| 81 | events. The IMStartEvent, IMComposeEvent and IMEndEvent. When a
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| 82 | new input context is created, an IMStartEvent will be sent to the
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| 83 | widget and delivered to the <a href="qwidget.html#imStartEvent">QWidget::imStartEvent</a>() function.
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| 84 | The widget can then update internal data structures to reflect
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| 85 | this.
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| 86 | <p> After this, an IMComposeEvent will be sent to the widget for
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| 87 | every key the user presses. It will contain the current
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| 88 | composition string the widget has to show and the current cursor
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| 89 | position within the composition string. This string is temporary
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| 90 | and can change with every key the user types, so the widget will
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| 91 | need to store the state before the composition started (the state
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| 92 | it had when it received the IMStartEvent). IMComposeEvents will be
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| 93 | delivered to the <a href="qwidget.html#imComposeEvent">QWidget::imComposeEvent</a>() function.
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| 94 | <p> Usually, widgets try to mark the part of the text that is part of
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| 95 | the current composition in a way that is visible to the user. A
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| 96 | commonly used visual cue is to use a dotted underline.
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| 97 | <p> After the user has selected the final string, an IMEndEvent will
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| 98 | be sent to the widget. The event contains the final string the
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| 99 | user selected, and could be empty if they canceled the
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| 100 | composition. This string should be accepted as the final text the
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| 101 | user entered, and the intermediate composition string should be
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| 102 | cleared. These events are delivered to <a href="qwidget.html#imEndEvent">QWidget::imEndEvent</a>().
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| 103 | <p> If the user clicks another widget, taking the focus out of the
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| 104 | widget where the composition is taking place the IMEndEvent will
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| 105 | be sent and the string it holds will be the result of the
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| 106 | composition up to that point (which may be an empty string).
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| 107 | <p>See also <a href="events.html">Event Classes</a>.
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| 108 |
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| 109 | <hr><h2>Member Function Documentation</h2>
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| 110 | <h3 class=fn><a name="QIMEvent"></a>QIMEvent::QIMEvent ( <a href="qevent.html#Type-enum">Type</a> type, const <a href="qstring.html">QString</a> & text, int cursorPosition )
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| 111 | </h3>
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| 112 |
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| 113 | <p> Constructs a new QIMEvent with the accept flag set to FALSE. <em>type</em> can be one of QEvent::IMStartEvent, QEvent::IMComposeEvent
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| 114 | or QEvent::IMEndEvent. <em>text</em> contains the current compostion
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| 115 | string and <em>cursorPosition</em> the current position of the cursor
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| 116 | inside <em>text</em>.
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| 117 |
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| 118 | <h3 class=fn>void <a name="accept"></a>QIMEvent::accept ()
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| 119 | </h3>
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| 120 |
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| 121 | <p> Sets the accept flag of the input method event object.
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| 122 | <p> Setting the accept parameter indicates that the receiver of the
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| 123 | event processed the input method event.
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| 124 | <p> The accept flag is not set by default.
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| 125 | <p> <p>See also <a href="#ignore">ignore</a>().
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| 126 |
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| 127 | <h3 class=fn>int <a name="cursorPos"></a>QIMEvent::cursorPos () const
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| 128 | </h3>
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| 129 |
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| 130 | <p> Returns the current cursor position inside the composition string.
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| 131 | Will return -1 for IMStartEvent and IMEndEvent.
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| 132 |
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| 133 | <h3 class=fn>void <a name="ignore"></a>QIMEvent::ignore ()
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| 134 | </h3>
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| 135 |
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| 136 | <p> Clears the accept flag parameter of the input method event object.
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| 137 | <p> Clearing the accept parameter indicates that the event receiver
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| 138 | does not want the input method event.
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| 139 | <p> The accept flag is cleared by default.
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| 140 | <p> <p>See also <a href="#accept">accept</a>().
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| 141 |
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| 142 | <h3 class=fn>bool <a name="isAccepted"></a>QIMEvent::isAccepted () const
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| 143 | </h3>
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| 144 |
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| 145 | <p> Returns TRUE if the receiver of the event processed the event;
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| 146 | otherwise returns FALSE.
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| 147 |
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| 148 | <h3 class=fn>int <a name="selectionLength"></a>QIMEvent::selectionLength () const
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| 149 | </h3>
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| 150 |
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| 151 | <p> Returns the number of characters in the composition string (
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| 152 | starting at <a href="#cursorPos">cursorPos</a>() ) that should be marked as selected by the
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| 153 | input widget receiving the event.
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| 154 | Will return 0 for IMStartEvent and IMEndEvent.
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| 155 |
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| 156 | <h3 class=fn>const <a href="qstring.html">QString</a> & <a name="text"></a>QIMEvent::text () const
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| 157 | </h3>
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| 158 |
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| 159 | <p> Returns the composition text. This is a null string for an
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| 160 | IMStartEvent, and contains the final accepted string (which may be
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| 161 | empty) in the IMEndEvent.
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| 162 |
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| 163 | <!-- eof -->
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| 164 | <hr><p>
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| 165 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 166 | Copyright © 1995-2007
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| 167 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 168 | <table width=100% cellspacing=0 border=0><tr>
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| 169 | <td>Copyright © 2007
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| 170 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 171 | <td align=right><div align=right>Qt 3.3.8</div>
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| 172 | </table></div></address></body>
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| 173 | </html>
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