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<title>Focus (computing)</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Focus (computing)</span></span>

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<p>In a <a href="Computing" title="Computing">computing</a> <a href="Graphical_user_interface" title="Graphical user interface">graphical user interface</a> (GUI), a component has <b>focus</b> when it is selected to receive input from the user by an event such as a mouse button click or keypress.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Moving the focus away from a specific user interface element is known as a <b>blur</b> event in relation to this element.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Typically, the focus is withdrawn from an element by giving another element the focus. This means that focus and blur <a href="Event_(computing)" title="Event (computing)">events</a> are virtually simultaneous in relation to different user interface elements, one that becomes focused and one that is "blurred" (in the computing, not visual, sense).

</p><p>The concept is similar to a <a href="Cursor_(user_interface)" title="Cursor (user interface)">cursor</a> in a text-based environment. However, when considering a graphical interface, there is also a <a href="Mouse_pointer" class="mw-redirect" title="Mouse pointer">mouse pointer</a> involved. Moving the mouse will typically move the mouse pointer without changing the focus. The focus can usually be changed by clicking on a component that can receive focus with the mouse. Many <a href="Desktop_environment" title="Desktop environment">desktops</a> also allow the focus to be changed with the keyboard. By convention, the <a href="Tab_key" title="Tab key"><style data-mw-deduplicate="TemplateStyles:r1249182868">

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</style><kbd class="keyboard-key nowrap">Tab ↹</kbd></a> key is used to move the focus to the next focusable component and <a href="Shift_key" title="Shift key"><kbd class="keyboard-key nowrap">⇧ Shift</kbd>+<kbd class="keyboard-key nowrap">Tab ↹</kbd></a> to the previous one. When graphical interfaces were first introduced, many computers did not have mice, so this alternative was necessary. This feature makes it easier for <a href="Computer_accessibility" title="Computer accessibility">people unable to use a mouse</a> to use the user interface. In certain circumstances the <a href="Arrow_keys" title="Arrow keys">arrow keys</a> can be used to change focus.

</p>

<div class="mw-heading mw-heading2"><h2 id="Window_focus">Window focus</h2></div>

<p>The behaviour of focus on one's desktop can be governed by policies in <a href="Window_manager" title="Window manager">window management</a>.

</p>

<div class="mw-heading mw-heading3"><h3 id="Click_to_focus">Click to focus</h3></div>

<p>On most mainstream user-interfaces, such as ones made by <a href="Microsoft" title="Microsoft">Microsoft</a> and <a href="Apple_Inc." title="Apple Inc.">Apple</a>, it is common to find a "focus follows click" policy (or "click to focus"), where one must click the mouse inside of the window for that window to gain focus. This also typically results in the window being raised above all other windows on screen. If a <b>clickfocus</b> model such as this is being used, the current application window continues to retain focus and collect input, even if the mouse pointer is over another application window.

</p>

<div class="mw-heading mw-heading3"><h3 id="Focus_follows_pointer">Focus follows pointer</h3></div>

<p>Another common policy on <a href="Unix" title="Unix">Unix</a> systems using <a href="X_Window_System" title="X Window System">X Window System</a> (X11) is the "focus follows mouse" policy (or FFM), where the focus automatically follows the current placement of the pointer. The focused window is not necessarily raised; parts of it may remain below other windows. Window managers with this policy usually offer "autoraise," which raises the window when it is focused, typically after a configurable short delay. A possible consequence of a <b>followfocus</b> policy is that no window has focus when the pointer is moved over the background with no window underneath; otherwise the focus simply remains in the last window.

</p>

<div class="mw-heading mw-heading3"><h3 id="Sloppy_focus">Sloppy focus</h3></div>

<p>The <b>sloppyfocus</b> model is a variant of the followfocus model.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It allows input to continue to be collected by the last focused window when the mouse pointer is moved away from any window, such as over a menubar or desktop area.

</p>

<div class="mw-heading mw-heading2"><h2 id="Focus_models_used_by_X11_window_managers">Focus models used by X11 window managers</h2></div>

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<th style="width: 15%">Clickfocus

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<th style="width: 15%">Followfocus

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<th style="width: 15%">Sloppyfocus

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<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

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<th style="text-align:left;"><a href="Awesome_(window_manager)" title="Awesome (window manager)">awesome</a>

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<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes (default)

</td></tr>

<tr>

<th style="text-align:left;">evilwm<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</th>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</th>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

<th style="text-align:left;"><a href="Fluxbox" title="Fluxbox">Fluxbox</a>

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<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

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/* start https://en.wikipedia.org/ */

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</style><sup class="citation nobold" id="ref_Alpha"><a href="#endnote_Alpha">[α]</a></sup>

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<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes (default)

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

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<th style="text-align:left;"><a href="IceWM" title="IceWM">IceWM</a><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

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<th style="text-align:left;">Karmen<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

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</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

<th style="text-align:left;">TinyWM<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>

</th>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

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<th style="text-align:left;"><a href="WindowLab" title="WindowLab">WindowLab</a>

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<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes (with no autoraise)

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

<th style="text-align:left;"><a href="Mutter_(software)" title="Mutter (software)">Mutter</a>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

<th style="text-align:left;">JWM

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

</th>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr></tbody></table>

<div class="mw-heading mw-heading2"><h2 id="Intra-window_component_focus">Intra-window component focus</h2></div>

<p>Individual components of a window may also have a focal position. For instance in a text editing package, the text editing window must have the Focus so that text can be entered. When text is entered into the component, it will appear at the position of the text-cursor, which will also normally be movable using the mouse pointer.

</p><p>Which component should have the default focus, and how focus should move between components, are difficult but important problems in user interface design. Giving the wrong thing focus means that the user has to waste time moving the focus. Conversely, giving the right thing focus can significantly enhance the user experience.

</p>

<ul><li><a href="Tabbing_navigation#Tab_order" title="Tabbing navigation">Tab order</a></li>

<li><a href="Focus_stealing" title="Focus stealing">Focus stealing</a></li>

<li><a href="Selection_(user_interface)" title="Selection (user interface)">Selection (user interface)</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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<li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://wiki.tcl.tk/13972#pagetoc79b8a397">"Whim basic information"</a>. <i>Tcler's Wiki</i>. 24 November 2009<span class="reference-accessdate">. Retrieved <span class="nowrap">16 January</span> 2016</span>.</cite></span>

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</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2></div>

<dl><dd><span class="citation wikicite" id="endnote_Alpha"><sup>α</sup></span> Per window or window class, with additional support for "never focus" — windows that should never receive focus.</dd></dl></div><div><div class="zim-footer">

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