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564 lines
23 KiB
564 lines
23 KiB
\chapter Introduction
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This document introduces \QA, a tool for presenting on-line
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documentation. It also introduces the Qt Reference Documentation which
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is accessible using \QA, or with a web browser. The document is
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divided into the following sections:
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\list
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\i Introduction to the Qt Reference Documentation
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\i The 1 Minute Guide to using Qt Assistant
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\i Qt Assistant in More Detail
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\i Full Text Searching
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\i Customizing Qt Assistant
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\endlist
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\chapter Introduction to the Qt Reference Documentation
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The documentation for the Qt library is written in-line in the \File
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.cpp files by the developers themselves. The documentation team
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revises the documentation to ensure that it is accurate and usable,
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and to provide quality control. The documentation team also writes the
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larger texts, such as the class descriptions that introduce a class
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along with the concepts the class uses, as well as introducing the
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functions and properties that the class provides.
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The documentation focuses on the API rather than the internals, since
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we make great efforts to keep our API consistent and compatible with
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each new version, but we may change the internals considerably to improve
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performance and enhance functionality.
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The Qt Reference Documentation consists of almost 1,500 HTML pages
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(over 2,500 printed pages). The overwhelming majority of pages
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document Qt classes. Since developers differ in the way they
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think and work we provide a variety of approaches to navigating the
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documentation set:
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\list
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\i The \link classes.html All Classes\endlink page lists every class
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in Qt's public API, and consists of several hundred classes.
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\i The \link mainclasses.html Main Classes\endlink page lists the
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classes you're most likely to use most often, and provides a much
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shorter and more managable list than the All Classes list.
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\i The \link groups.html Grouped Classes\endlink page presents a list
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of groups, each of which leads to a list of related classes, for
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example, the \link advanced.html Advanced Widgets\endlink list.
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\i The \link hierarchy.html Inheritance Hierarchy\endlink page
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presents a list of classes in terms of the hierarchy of Qt classes.
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\i The \link functions.html All Functions\endlink page lists all the
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functions provided by Qt classes, each one with links to the class(es)
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in which it appears.
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\endlist
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No matter where you find yourself in the Qt documentation, you will
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find extensive cross-referencing. Even snippets of example code
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contain clickable links, so that for example, if you come across a
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class declaration in a code example, the class name will be a
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clickable link to the class's documentation.
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In addition to the class documentation some of Qt's modules have
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extensive descriptions, and there are many overview documents which
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describe various aspects of the Qt library; all these are linked from
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the reference documentation home page. There are also two tutorials
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and numerous example programs in the examples subdirectory of the Qt
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distribution.
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\chapter The 1 Minute Guide to Using Qt Assistant
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Under Windows, \QA is available as a menu option on the Qt menu. On
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Unix, run \c{assistant} from an xterm.
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When you start up \QA, you will be presented with a standard
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main-window style application, with a menu bar and toolbar. Below
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these, on the left hand side is a navigation window called the \e
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Sidebar, and on the right, taking up most of the space, is the
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documentation window. By default, the Qt Reference Documentation's home
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page is shown in the documentation window.
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\QA works in a similar way to a web browser. If you click underlined
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text (which signifies a cross-reference), the documentation window will
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present the relevant page. You can bookmark pages of particular
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interest and you can click the \Toolbutton Previous and \Toolbutton
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Next toolbar buttons to navigate within the pages you've visited.
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Although \QA can be used just like a web browser to navigate through
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the Qt documentation set, \QA offers a powerful means of navigation
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that web browsers don't provide. \QA uses an intelligent algorithm to
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index all the pages in the documentation sets that it presents so that
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you can search for particular words and phrases.
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To perform an index search, click the \Toolbutton Index tab on the Sidebar
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(or click \Key Ctrl+I). In the 'Look For' line edit enter a word, e.g.
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'homedirpath'. As you type, words are found and highlighted in a list
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beneath the line edit. If the highlighted text matches what you're
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looking for, double click it, (or press \Key Enter) and the
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documentation window will display the relevant page. You rarely have
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to type in the whole word before \QA finds a match. Note that for some
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words there may be more than one possible page that is relevant.
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\QA also provides full text searching for finding specific words in
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the documentation. Documents with the highest occurrences of the word
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that you are looking for appear first, and every occurrence of the
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word within the documentation is highlighted.
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\omit
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For example, enter 'setenabled' in the 'Look For' line edit.
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As you type, words are found and highlighted in the list beneath the
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line edit, as before. Once the highlighted text matches what you're
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looking for, double click it, (or press \Key Enter). In the case of
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setEnabled, it is a function name which occurs in several classes, so
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a dialog pops up listing the possible choices. Click the choice you're
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interested in (or move to it using the \Key Up and \Key Down arrow
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keys and press \Key Enter). The relevant page will display in the
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documentation window.
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\endomit
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\QA can be customized by creating profiles, a collection of
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documentation. Profiles can be created for your own use, or for an
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application you will distribute. With profiles, you can select which
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documentation you want the end user of your application to be able to
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view.
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\chapter Qt Assistant in More Detail
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\img assistant.png
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\caption Qt Assistant
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\section1 The Sidebar
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\img sidebar.png
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The sidebar provides four ways of navigating documentation:
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\list 1
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\i The \Toolbutton Contents tab presents a tree view of the
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documentation sets that are available. If you click an item, its
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documentation will appear in the documentation window. If you double
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click an item or click a '+' sign to the left of an item, the item's
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sub-items will appear. Click a sub-item to make its page appear in the
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documentation window. Click a '-' sign to the left of an item to hide
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its sub-items.
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\i The \Toolbutton Index tab is used to look up key words or phrases.
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See \l{The 1 Minute Guide to using Qt Assistant} for how to use this
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tab.
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\i The \Toolbutton Bookmarks tab lists any bookmarks you've made.
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Double click a bookmark to make its page appear in the documentation
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window. The \Toolbutton Bookmarks tab has a \Button{New Bookmark}
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button and a \Button{Delete Bookmark} button at the bottom. Click
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\Button{New Bookmark} to bookmark the page that is showing in the
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documentation window. Click a bookmark in the list, then click
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\Button{Delete Bookmark} to delete the highlighted bookmark.
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\i The \Toolbutton Search tab provides full text search of \e all
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the documents. See \l{Full Text Searching} for more information about
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this feature.
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\endlist
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If you want the documentation window to use as much space as possible,
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you can easily hide or show the Sidebar. If the Sidebar is showing,
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press \Key Ctrl+T, \Key Ctrl+I, \Key Ctrl+B or \Key Ctrl+S to hide it.
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If the Sidebar is hidden, press \Key Ctrl+T to show it on the Contents
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tab, or press \Key Ctrl+I to show it on the Index tab (with the focus
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in the 'Look For' line edit box), or press \Key Ctrl+B to show it on
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the Bookmarks tab, or press \Key Ctrl+S to show it on the (full text)
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Search tab.
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The Sidebar is a dock window, so you can drag it to the top, left,
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right or bottom of \QA's window, or you can drag it outside \QA to
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float it.
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\section1 The Documentation Window
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\img docwindow.png
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The documentation window offers a feature for viewing documentation by
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enabling you to create tabs for each documentation page that you view.
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Click the \Button {Add Tab} button and a new tab will appear with the
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page name as the tab's caption. This makes it convenient to switch
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between pages when you are working with different documentation. You
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can delete a tab by clicking the \Button {Close Tab} button located
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on the right side of the documentation window.
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\section1 The Toolbar
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\img toolbar1.png
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The toolbar provides fast access to the most common actions.
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\list
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\i \Toolbutton Previous takes you to the previous page. The menu
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option is \Menu Go|Previous and the keyboard shortcut is \Key{Alt+Left
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Arrow}.
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\i \Toolbutton Next takes you to the next page. The menu
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option is \Menu Go|Next and the keyboard shortcut is \Key{Alt+Right
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Arrow}.
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\i \Toolbutton Home takes you to the home page (normally the home page
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of the Qt Reference Documentation). The menu
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option is \Menu Go|Home and the keyboard shortcut is \Key{Ctrl+Home}.
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\i \Toolbutton Copy copies any selected text to the clipboard. The menu
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option is \Menu Edit|Copy and the keyboard shortcut is \Key{Ctrl+C}.
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\i \Toolbutton{Find in Text} invokes the \Dialog{Find Text} dialog. The menu
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option is \Menu{Edit|Find in Text} and the keyboard shortcut is \Key{Ctrl+F}.
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\i \Toolbutton{Print} invokes the \Dialog{Print} dialog. The menu
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option is \Menu{File|Print} and the keyboard shortcut is \Key{Ctrl+P}.
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\i \Toolbutton{Zoom in} increases the font size. The menu
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option is \Menu{View|Zoom in} and the keyboard shortcut is \Key{Ctrl++}.
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\i \Toolbutton{Zoom out} decreases the font size. The menu
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option is \Menu{View|Zoom out} and the keyboard shortcut is \Key{Ctrl+-}.
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\i \Toolbutton{What's This?} provides a description of a \QA feature.
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The menu option is \Menu{Help|What's This?} and the keyboard shortcut
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is \Key{Shift+F1}.
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\endlist
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The remaining toolbar buttons are bookmarks and will vary depending on
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your configuration.
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\section1 The Menus
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\section2 The File Menu
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\list
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\i \Menu{File|Print} invokes the \Dialog{Print} dialog.
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\i \Menu{File|Exit} terminates \QA.
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\endlist
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\section2 The Edit Menu
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\list
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\i \Menu{Edit|Copy} copies any selected text to the clipboard.
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\i \Menu{Edit|Find in Text} invokes the \Dialog{Find Text} dialog.
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\i \Menu{Edit|Settings} invokes the \Dialog{Settings} dialog.
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\endlist
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\section2 The View Menu
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\list
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\i \Menu{View|Zoom in} increases the font size.
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\i \Menu{View|Zoom out} decreases the font size.
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\i \Menu{View|Views|Sidebar} toggles the display of the Sidebar.
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\i \Menu{View|Views|Toolbar} toggles the display of the Toolbar.
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\i \Menu{View|Views|Line up} lines up the toolbar buttons in the
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Toolbar.
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\endlist
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\section2 The Go Menu
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\list
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\i \Menu{Go|Previous} displays the previous page.
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\i \Menu{Go|Next} displays the next page.
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\i \Menu{Go|home} goes to the home page.
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\endlist
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This menu also has additional items; these are pre-defined bookmarks
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that vary depending on your configuration.
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\section2 The Bookmarks Menu
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\list
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\i \Menu{Bookmarks|Add} adds the current page to the list of bookmarks.
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\endlist
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This menu may have additional items, i.e. any bookmarks that you have
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already made. If you want to delete a bookmark go to the Bookmarks tab
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on the Sidebar.
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\section1 The Dialogs
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\section2 The Print Dialog
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This dialog is platform-specific. It gives access to various printer
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options and can be used to print the current page.
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\section2 The Find Text Dialog
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This dialog is used to find text in the current page. Enter the text
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you want to find in the Find line edit. If you check the 'Whole words
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only' checkbox, the search will only consider whole words, i.e. if you
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search for 'spin' with this checkbox checked it will not match
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'spinbox', but will match 'spin'. If you check the 'Case sensitive'
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check box then, for example, 'spin' will match 'spin' but not 'Spin'.
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You can search Forward or Backward from your current position in the
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page by clicking one of the Direction radio buttons. Click the \Button
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Find button to search (or search again), and click the \Button Close
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button to finish.
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\section2 The Settings Dialog
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The Settings dialog is used to set your preferences for \QA. The
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dialog has four tabs: General Settings, Web Settings, PDF Settings,
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and Profiles. \QA will remember your settings between sessions,
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including window sizes and positions, and which pages you have open.
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Each of the tabs is discussed as follows:
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\list
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\i General Settings
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\img general.png
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To change the base font used throughout \QA, select a
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font type from the Font combobox. To choose a new fixed-width
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font, for example, to show code snippets, choose a font type from
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the 'Fixed font' combobox. To change the color of hypertext
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links, click the 'Link color' color button. Uncheck the
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'Underline links' checkbox if you don't want underlined links.
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\i Web Settings
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\img web.png
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Some pages contain links to external web pages. In order to display
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these links, you must specify a web browser. Type the name of your
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browser's executable in the Web Browser Application line edit.
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Alternatively, click the \Button {(ellipsis)} button to invoke the
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\Widget {Set Web Browser} dialog and navigate until you find the web
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browser you want to use. Click \Button {Save} to accept the selection.
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To change \QA's default home page, enter the file name in the Home
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Page line edit. Alternatively, click the \Button {(ellipsis)} button
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to invoke the \Widget {Set Homepage} dialog. Navigate until you find
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the home page file you want to use and then click \Button {Save} to
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accept the selection.
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\i PDF Settings
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\img pdf1.png
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Some pages contain links to PDF documents. In order to display these
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links, you must specify a PDF viewer. Type in the name of your PDF viewer's
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executable in the line edit. Alternatively, click the \Button {(ellipsis)}
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button to invoke the \Widget {Set PDF Browser} dialog and navigate
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until you find the PDF viewer you want to use. Click \Button Save to
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accept the selection.
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\chapter Full Text Searching
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\img search.png
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\QA provides a powerful full text search engine. To search
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for certain words or text, click the 'Search' tab in the sidebar. Then
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enter the text you want to look for and press \Key Enter or click
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\Button Search. The search is not case sensitive, so Foo, fOo and
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FOO are all treated as the same. The following are examples of common search
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patterns:
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\list
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\i \c deep -- lists all the documents that contain the word 'deep'
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\i \c{deep*} -- lists all the documents that contain a word beginning
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with 'deep'
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\i \c{deep copy} -- lists all documents that contain both 'deep' \e
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and 'copy'
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\i \c{"deep copy"} -- list all documents that contain the phrase 'deep copy'
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\endlist
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The wildcard (*) character cannot be used within quotes.
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The list of documents found is ordered according to the number of
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occurrences of the search text they contain, therefore those with the
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highest number of occurrences appearing first. Simply click any
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document in the list to display it in the document window.
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If the documentation has changed, i.e. if documents have been added or
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removed, \QA will reindex.
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\chapter Customizing Qt Assistant
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\QA can be customized by adding and removing documentation from its
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documentation set. In addition, \QA introduces the profiles option,
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which enables its properties to change, for example, the default
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startup page, and application icon.
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\section1 Modifying the Default Documentation Set
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When it is started without any options, \QA displays a default set of
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documentation. When Qt is installed, the default documentation set in
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\QA contains the Qt reference documentation as well as the tools that
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come with Qt, such as \QD and qmake.
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Documentation can be added or removed from \QA by
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adding and removing the content files. The format of the content files are
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specified below. To add a content file, type the following command line
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option: \c{-addContentFile docfile}. To remove a content file from the
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default set, type the following command line option:
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\c{-removeContentFile docfile}. For example:
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\code
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1: > assistant -addContentFile file.dcf
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2: > assistant
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3: > assistant -removeContentFile file.dcf
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\endcode
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In line one, we add the content file \c file.dcf. In line two, we start
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\QA. The default set will now be extended with the doc file
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\c file.dcf. In line three we remove the file \c file.dcf from the default
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documentation set so that subsequent use of \QA will not contain this
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file.
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\section2 Documentation Content File Format
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The Documentation Content File must contain the documentation's table
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of contents and all important keywords for the index. In addition, it
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may inherit an icon for the documentation which is displayed in the
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\QA toolbar. You can also specify an extra directory path for
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additional images used in the documentation.
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An example of a content file that uses all the available tags and
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attributes is shown below:
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\code
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<assistantconfig version="3.2.0">
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<DCF ref="demo.html" icon="handbook.png" imagedir="../img/"
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title="Development Demo Handbook">
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<section ref="./chap1/chap1.html" title="Chapter1">
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<section ref="./chap1/section1.html" title="Section1">
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<keyword ref="./chap1/section1.html#foo">foo</keyword>
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<keyword ref="./chap1/section1.html#bla">bla</keyword>
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<section ref="./chap1/section1.html#subsection1" title="Subsection 1"/>
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<section ref="./chap1/section1.html#subsection2" title="Subsection 2"/>
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<section ref="./chap1/section1.html#subsection3" title="Subsection 3"/>
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</section>
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<section ref="./chap1/section2" title="Section2">
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<section ref="./chap1/section2.html#subsection1" title="Subsection 1"/>
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<section ref="./chap1/section2.html#subsection2" title="Subsection 2"/>
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<section ref="./chap1/section2.html#subsection3" title="Subsection 3"/>
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</section>
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</section>
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<section ref="./chap2/chap2.html" title="Chapter2">
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<keyword ref="./chap2/chap2.html#foo">foo</keyword>
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<section ref="./chap2/section1.html" title="Section1"/>
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</section>
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</DCF>
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</assistantconfig>
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\endcode
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Sections may be nested as deeply as necessary. All references should
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be related.
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Note that any \c keyword tags for a given section must appear \e
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before any sections nested within the given section.
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The paths in the \c refs attribute are always written Unix-style
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(forward slashes) and are relative to the location of the
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documentation content file itself.
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Since the introduction of the new root tag \c assistantconfig in the
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fileformat from Qt version 3.2.0, it is possible to specify multiple DCF tags in
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one file. Note that the old document contents file format, used up to
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Qt 3.2 is still valid.
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\section1 Profiles
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Profiles enable \QA to act as a specialized help tool for displaying
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documentation for applications. With profiles, the documentation
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writer can change properties such as \QA's title, application icons, and
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'about' dialogs. In addition, profiles can be used to run specialized
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documentation sets that are separate from the Qt docs. \QA can be
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customized by changing the following properties:
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\list
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\i Name- This property is used to name the profile. If multiple
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profiles are used for the same installation of \QA, this
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parameter is crucial to keep their profile specific settings
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apart. The property name is \c name
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\i Title- This property is used to specify a caption for \QA. The
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property name is \c title
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\i Application Icon- This property describes an icon that will be used
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as \QA application icon. The location of the icon is relative to the
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location of the profile. The property name is \c applicationicon
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|
|
\i Start Page- This property specifies which page \QA should initially
|
|
display when the profile is used. Usually, this is the HTML file which
|
|
contains the documentation's table of contents. This property also
|
|
describes the default location to go to when pressing the home button
|
|
in \QA's main user interface. The start page is specified relative to
|
|
the location of the profile. The property name is \c startpage
|
|
|
|
\i About Menu Text- This property describes the text that appears in
|
|
the \Menu Help menu, e.g. About Application. The property name is \c
|
|
aboutmenutext
|
|
|
|
\i About URL- This property can be used to point to an HTML file that
|
|
describes the contents in the About dialog that is opened for the
|
|
\Menu Help menu, e.g. About Application. The url is specified relative
|
|
to the location of the profile. The property name is \c abouturl
|
|
|
|
\i \QA Documentation- This property describes the location of
|
|
the \QA documentation. This is required since \QA provides
|
|
self help, such as the full text search help and the \QA
|
|
Manual option in the \Menu Help menu. The location is a directory
|
|
relative to the location of the profile. The property name is \c
|
|
assistantdocs.
|
|
|
|
\endlist
|
|
|
|
To define a profile, one needs to specify a \QA Document
|
|
Profile, usually abbreviated \c{.adp}. The profile is an extension of
|
|
the Documentation Content File described above. We add a \c profile
|
|
tag containing \c property tags to the format.
|
|
|
|
An example of a document profile file is shown below:
|
|
|
|
\c helpdemo.adp
|
|
|
|
\code
|
|
<assistantconfig version="3.2.0">
|
|
|
|
<profile>
|
|
<property name="name">HelpExample</property>
|
|
<property name="title">Help Example</property>
|
|
<property name="applicationicon">logo.png</property>
|
|
<property name="startpage">index.html</property>
|
|
<property name="aboutmenutext">About Help</property>
|
|
<property name="abouturl">../about.txt</property>
|
|
<property name="assistantdocs">../../../doc/html</property>
|
|
</profile>
|
|
|
|
<DCF ref="index.html" icon="handbook.png" title="Help example">
|
|
<section ref="./manual.html" title="How to use this Example">
|
|
<keyword ref="./manual.html#installdocs">Install Docs</keyword>
|
|
<keyword ref="./manual.html#onlydoc">Example Profile</keyword>
|
|
<keyword ref="./manual.html#hide">Hide Sidebar</keyword>
|
|
<keyword ref="./manual.html#openqabutton">Open</keyword>
|
|
<keyword ref="./manual.html#closeqabutton">Close</keyword>
|
|
<keyword ref="./manual.html#display">Display</keyword>
|
|
</section>
|
|
</DCF>
|
|
|
|
</assistantconfig>
|
|
\endcode
|
|
|
|
These files are XML files. Characters such as \c{<}, \c{>}, and \c{&}
|
|
must be written as entities (e.g., \c{<}, \c{>}, \c{&}).
|
|
|
|
\section2 Using Profiles
|
|
|
|
To use a profile, run \QA with the option \c {-profile filename}.
|
|
This will load the profile specified in the file and will customize
|
|
\QA accordingly. For example, to run \QA with the example
|
|
file above, \c helpdemo.adp, we would run the command as follows:
|
|
|
|
\code
|
|
> assistant -profile helpdemo.adp
|
|
\endcode
|
|
|
|
See the HelpDemo example in the Qt distribution for a demonstration
|
|
on how to use \QA with profiles for your own applications.
|
|
|
|
When distributing \QA with your application, you will also need to
|
|
copy the icon files from the \c QTDIR/tools/assistant/images
|
|
directory so that \QA finds its icons.
|
|
|
|
\omit
|
|
For small documentation sets, the sidebar may not be necessary. You
|
|
can hide the sidebar on startup with the following:
|
|
\code
|
|
assistant -hideSidebar
|
|
\endcode
|
|
\endomit
|
|
|