add extensive documentation on system navigation
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Daniel Micay
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<nav id="table-of-contents">
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<nav id="table-of-contents">
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<h2><a href="#table-of-contents">Table of contents</a></h2>
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<h2><a href="#table-of-contents">Table of contents</a></h2>
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<ul>
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<ul>
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<li>
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<a href="#system-navigation">System navigation</a>
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<ul>
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<li><a href="#gesture-navigation">Gesture navigation</a></li>
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<li><a href="#2-button-navigation">2-button navigation</a></li>
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<li><a href="#3-button-navigation">3-button navigation</a></li>
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</ul>
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</li>
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<li><a href="#accessibility">Accessibility</a></li>
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<li><a href="#accessibility">Accessibility</a></li>
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<li><a href="#auditor">Auditor</a></li>
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<li><a href="#auditor">Auditor</a></li>
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<li>
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<li>
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@ -116,6 +124,112 @@
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working without problematic barriers.</p>
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working without problematic barriers.</p>
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</section>
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</section>
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<section id="system-navigation">
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<h2><a href="#system-navigation">System navigation</a></h2>
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<p>By default, GrapheneOS uses gesture-based navigation. We recommend reading our
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guide on gesture navigation and giving it a chance even if you think you won't
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like it. Our experience is that when armed with the appropriate knowledge, the
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vast majority of users prefer the newer gesture navigation approach.</p>
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<p>The system navigation mode can be configured in Settings → System → Gestures →
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System navigation. The same menu is also available in Settings → Accessibility →
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System navigation.</p>
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<section id="gesture-navigation">
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<h3><a href="#system-navigation">System navigation</a></h3>
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<p>The bottom of the screen is a reserved touch zone for system navigation. A
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line is displayed in the center to show that the navigation bar is present
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across the entire bottom of the screen. In most apps, this area will display
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padding. Modern apps are able to tell the OS that they can handle not having
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the padding to display app content there while still not being able to receive
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touches from it. Open up the Settings app for an example.</p>
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<p>Swiping up from the navigation bar while removing your finger from the
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screen is the <strong>Home</strong> gesture.</p>
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<p>Swiping up from the navigation bar while holding your finger on the screen
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before releasing is the <strong>Recent Apps</strong> gesture. The most
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recently opened activity is always on the furthest right. Each step left goes
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one step back through the history of recently opened apps. Opening an app with
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the recent apps activity will place it on the furthest right in the recent
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apps order just like a new app being opened.</p>
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<p>The recent apps activity has a screenshot button as an alternative to
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holding power and volume down while using an app.</p>
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<p>Rather than opening the recent apps activity, you can swipe left on the
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navigation bar for the <strong>Previous</strong> app and swipe right for the
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<strong>Next</strong> app. This will not change the recent apps order. This is
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usually the best way to navigation through recent apps.</p>
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<p>Swiping from either the left or the right of the screen within the app (not
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the navigation bar) is the <strong>Back</strong> gesture. Apps are supposed to
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avoid implementing conflicting gestures, but have the option to override this
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gesture if they truly need to get rid of it. However, many apps without active
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development of their UI design still haven't addressed this despite gestures
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being the default for 2 years on Google Android. You can avoid triggering the
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back gesture in one of 2 easy ways: avoid swiping from right near the edge or
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hold your finger on the side of the screen for a period of time before
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swiping. The more advanced option is using a diagonal swipe pointing sharply
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to the bottom of the screen since this will bypass the back gesture but will
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still trigger most app gestures. The advanced option is the most convenient
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approach once you get used to doing it.</p>
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<p>The launcher uses a swipe up gesture starting anywhere on the screen to
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open the app drawer from the home screen. You need to start that gesture above
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the system navigation bar since any gesture starting on the navigation bar is
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handled by the OS as a system navigation gesture.</p>
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</section>
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<section id="2-button-navigation">
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<h3><a href="#2-button-navigation">2-button navigation</a></h3>
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<p>2-button navigation is a legacy mode not supported anymore by Google
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Android on the Pixel 4 and later. It will likely be removed in a future
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release of GrapheneOS. You should use the 3-button mode if you want the
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traditional button-based navigation.</p>
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<p>A large row across the bottom of the screen is reserved for navigation
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buttons. The <strong>Back</strong> button is on the left and the
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<strong>Home</strong> button is in the center.</p>
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<p>Swiping up from the navigation bar while removing your finger from the
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screen is the <strong>Recent apps</strong> gesture. The most recently opened
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activity is always on the furthest right. Each step left goes one step back
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through the history of recently opened apps. Opening an app with the recent
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apps activity will place it on the furthest right in the recent apps
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order just like a new app being opened.</p>
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<p>2-button navigation provides the recent apps activity with the launcher. It
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shows the recent apps above the bottom row of the home screen and the search
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integration not used in GrapheneOS. The usual launcher features work including
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swiping up anywhere on the screen to open the app drawer. Due to the launcher
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integration, the screenshot button available in the other modes isn't present.
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Instead, a screenshot button is added to the global action menu accessed by
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holding the power button.</p>
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</section>
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<section id="3-button-navigation">
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<h3><a href="#3-button-navigation">3-button navigation</a></h3>
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<p>A large row across the bottom of the screen is reserved for navigation
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buttons. The <strong>Back</strong> button is on the left, the
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<strong>Home</strong> button is in the center and the <strong>Recent
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Apps</strong> button is on the left.</p>
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<p>In the recent apps activity, the most recently opened activity is always on
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the furthest right. Each step left goes one step back through the history of
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recently opened apps. Opening an app with the recent apps activity will place
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it on the furthest right in the recent apps order just like a new app being
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opened.</p>
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<p>The recent apps activity has a screenshot button as an alternative to
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holding power and volume down while using an app.</p>
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</section>
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</section>
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<section id="auditor">
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<section id="auditor">
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<h2><a href="#auditor">Auditor</a></h2>
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<h2><a href="#auditor">Auditor</a></h2>
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<p>See the <a href="https://attestation.app/tutorial">tutorial page on the site for the attestation sub-project</a>.</p>
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<p>See the <a href="https://attestation.app/tutorial">tutorial page on the site for the attestation sub-project</a>.</p>
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