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-
-/*!
-\page qml-righttoleft.html
-\title QML Right-to-left User Interfaces
-
-\section1 Overview
-
-This chapter discusses different approaches and options available for implementing right-to-left
-language support for Qt Quick applications. Some common right-to-left languages include Arabic, Hebrew,
-Persian and Urdu. Most changes include making sure that text translated to right-to-left languages
-is properly aligned to the right, and horizontally ordered content in views, lists and grids flows
-correctly from the right to left.
-
-In right-to-left language speaking cultures, people naturally scan and read graphic elements and text
-from the right to left. The general rule of thumb is that content (like photos, videos and maps) is not
-mirrored, but positioning of the content (like application layouts and the flow of visual elements) is
-mirrored. For example, photos shown in chronological order should flow from right to left, the
-low end range of the horizontal sliders should be located at the right side of the slider, and
-text lines should should be aligned to the right side of the available text area. The location of visual
-elements should not be mirrored when the position is related to a content; for example, when a
-position marker is shown to indicate a location on a map. Also, there are some special cases you may
-need to take into account where right-to-left language speakers are used to left-to-right
-positioning, for example when using number dialers in phones and media play, pause, rewind and
-forward buttons in music players.
-
-\section1 Text Alignment
-
-(This applies to the \l Text, \l TextInput and \l TextEdit elements.)
-
-When the horizontal alignment of a text item is not explicitly set, the text element is
-automatically aligned to the natural reading direction of the text. By default left-to-right text
-like English is aligned to the left side of the text area, and right-to-left text like Arabic is
-aligned to the right side of the text area. The alignment of a text element with empty text takes
-its alignment cue from \l QApplication::keyboardInputDirection(), which is based on the active
-system locale.
-
-This default locale-based alignment can be overriden by setting the \c horizontalAlignment
-property for the text element, or by enabling layout mirroring using the \l LayoutMirroring attached
-property, which causes any explicit left and right horizontal alignments to be mirrored.
-Note that when \l LayoutMirroring is set, the \c horizontalAlignment property value remains unchanged;
-use the property \c LayoutMirroring.enabled instead to query whether the mirroring is in effect.
-
-\snippet doc/src/snippets/declarative/righttoleft.qml 0
-
-\section1 Layout direction of positioners and views
-
-(This applies to the \l Row, \l Grid, \l Flow, \l ListView and \l GridView elements.)
-
-From Qt Quick 1.1 onwards, elements used for horizontal positioning and model views have gained a \c layoutDirection
-property for controlling the horizontal direction of the layouts. Setting \c layoutDirection to
-\c Qt.RightToLeft causes items to be laid out from the right to left. By default Qt Quick follows
-the left-to-right layout direction.
-
-The horizontal layout direction can also be reversed through the \l LayoutMirroring attached property.
-This causes the effective \c layoutDirection of positioners and views to be mirrored. Note though that the actual
-value of the \c layoutDirection property will remain unchanged; use the property \c LayoutMirroring.enabled instead
-to query whether the mirroring is in effect.
-
-\snippet doc/src/snippets/declarative/righttoleft.qml 1
-
-\section1 Layout mirroring
-
-The attached property \l LayoutMirroring is provided as a convenience for easily implementing right-to-left
-support for existing left-to-right Qt Quick applications. It mirrors the behavior of \l {anchor-layout}
-{Item anchors}, the layout direction of \l{Using QML Positioner and Repeater Items}{positioners} and
-model views, and the explicit text alignment of QML text elements.
-
-You can enable layout mirroring for a particular \l Item:
-
-\snippet doc/src/snippets/declarative/righttoleft.qml 2
-
-Or set all child elements to also inherit the layout direction:
-
-\snippet doc/src/snippets/declarative/righttoleft.qml 3
-
-Applying mirroring in this manner does not change the actual value of the relevant anchor,
-\c layoutDirection or \c horizontalAlignment properties. The separate read-only property
-\c effectiveLayoutDirection can be used to query the effective layout
-direction of positioners and model views that takes the mirroring into account. Similarly the \l Text,
-\l TextInput and \l TextEdit elements have gained the read-only property \c effectiveHorizontalAlignment
-for querying the effective visual alignment of text. For anchors, the read only
-\l {Item::anchors.top}{anchors.mirrored} property reflects whether anchors have been mirrored.
-
-Note that application layouts and animations that are defined using \l {Item::}{x} property values (as
-opposed to anchors or positioner elements) are not affected by the \l LayoutMirroring attached property.
-Therefore, adding right-to-left support to these types of layouts may require some code changes to your application,
-especially in views that rely on both the anchors and x coordinate-based positioning. Here is one way to use
-the \l LayoutMirroring attached property to apply mirroring to an item that is positioned using \l {Item::}{x}
-coordinates:
-
-\snippet doc/src/snippets/declarative/righttoleft.qml 4
-
-Not all layouts should necessarily be mirrored. There are cases where a visual element is positioned to
-the right side of the screen for improved one-handed use, because most people are right-handed, and not
-because of the reading direction. In the case that a child element should not be affected by mirroring,
-set the \l {LayoutMirroring::enabled}{LayoutMirroring.enabled} property for that element to false.
-
-Qt Quick is designed for developing animated, fluid user interfaces. When mirroring your application, remember to test that
-the animations and transitions continue to work as expected. If you do not have the resources to add
-right-to-left support for your application, it may be better to just keep the application layouts left
-aligned and just make sure that text is translated and aligned properly.
-
-\section1 Mirroring icons
-
-(This applies to \l Image, \l BorderImage and \l AnimatedImage elements.)
-
-Most images do not need to be mirrored, but some directional icons, such as arrows, may need to be mirrored.
-The painting of these icons can be mirrored with a dedicated \c mirror property introduced in Qt Quick 1.1:
-
-\snippet doc/src/snippets/declarative/righttoleft.qml 5
-
-\section1 Default layout direction
-
-The \l {QML:Qt::application}{Qt.application.layoutDirection} property can be used to query the active layout direction of the
-application. It is based on QApplication::layoutDirection(), which most commonly determines the layout
-direction from the active language translation file.
-
-To define the layout direction for a particular locale, declare the dedicated string literal
-\c QT_LAYOUT_DIRECTION in context \c QApplication as either "LTR" or "RTL".
-
-You can do this by first introducing this line
-
-\code
-QT_TRANSLATE_NOOP("QApplication", "QT_LAYOUT_DIRECTION");
-\endcode
-
-somewhere in your QML source code and calling \c lupdate to generate the translation source file.
-
-\code
-lupdate myapp.qml -ts myapp.ts
-\endcode
-
-This will append the following declaration to the translation file, where you can fill in either "LTR" or
-"RTL" as the translation for the locale.
-
-\code
-<context>
-    <name>QApplication</name>
-    <message>
-        <location filename="myapp.qml" line="33"/>
-        <source>QT_LAYOUT_DIRECTION</source>
-        <translation type="unfinished">RTL</translation>
-    </message>
-</context>
-\endcode
-
-You can test that the layout direction works as expected by running your Qt Quick application with
-the compiled translation file:
-
-\code
-qmlviewer myapp.qml -translation myapp.qm
-\endcode
-
-You can test your application in right-to-left layout direction simply by executing qmlviewer with a
-command-line parameter "-reverse":
-
-\code
-qmlviewer myapp.qml -reverse
-\endcode
-
-The layout direction can also be set from C++ by calling the static function \l QApplication::setLayoutDirection():
-
-\code
-QApplication app(argc, argv);
-app.setLayoutDirection(Qt::RightToLeft);
-\endcode
-
-*/