author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-3FE54688-2CDE-5359-9ABB-B83BFA025A81" xml:lang="en"><title>Window-owning |
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controls and non-window-owning controls</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>Controls are similar to windows in the Window Server in that they are both |
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bounded areas of the screen and both user interface elements. They are not |
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synonymous, however, as a control may take up the whole of a window’s area |
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or only part of it. For this reason controls are divided into two types: window-owning |
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controls and non-window-owning controls. </p> |
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<section id="GUID-A9A8EEB4-2E5D-4926-97C7-33A1A0CF67CB"><title>Window-owning controls</title> <p>A window-owning control |
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has the same size and position as a window in the Window Server. Window-owning |
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controls may overlap each other and may be moved around the screen within |
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the bounds of their parent window. Dialogs, menus, toolbars and <keyword>top-level |
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controls</keyword> are typically window-owning controls. </p> </section> |
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<section id="GUID-E0C33F8A-9A4A-4953-A57C-E96921290086"><title>Non-window-owning controls (lodger controls)</title> <p>The |
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majority of controls are non-window-owning. A non-window-owning control’s <keyword>extent</keyword> typically |
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covers only part of a window on the screen: usually it is one of a number |
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of controls within a larger <keyword>compound control</keyword> which acts |
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as a container. </p> <p>Examples of non-window-owning controls include command |
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buttons, text boxes and labels. </p> <p>Non-window-owning controls give greater |
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efficiency as they require fewer resources in the Window Server and fewer |
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process switches. They can also result in faster intialisation and redrawing |
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because a compound control and all its non-window-owning components can be |
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drawn with a single flush to the window server. </p> </section> |
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<section id="GUID-22B830AC-D43C-4FB6-9C5D-1F89AD65EF8F"><title>Associated windows</title> <p>All controls have an <keyword>associated |
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window</keyword>, whether they are window-owning or not. For a window-owning |
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control the associated window is the window it owns. For a non-window-owning |
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control the associated window is the window owned by the nearest window-owning |
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control above it in the control hierarchy. </p> </section> |
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<section id="GUID-C62985F2-84D3-44C5-BB1E-9576227FBC74"><title>See also</title> <ul> |
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<li><p><xref href="GUID-2C443E6F-BC3D-5252-8098-9F850AA88A35.dita">Window server</xref></p></li> |
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<li><p><xref href="GUID-E244744F-4837-5B46-8E37-4666A28BF0B7.dita">Run-time control |
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hierarchy</xref></p></li> |
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<li><p><xref href="GUID-B84FA223-3DFD-58C5-8CEF-C5AA73AA6290.dita">How to write |
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controls</xref></p></li> |
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</ul></section> |
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</conbody></concept> |