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When I launch an app (default Browser for example), it seems that there is no way to exit except reboot. I'm using PlayBook emulator.
Swipe up from the bottom of the screen
Use a "bottom-swipe" gesture (starting in the bottom bezel region, drag up into the screen area). The app window will minimize itself, at which point you can click on its X widget to close it, or drag it up to "toss it" away.
The basic gestures are described in the Getting Started guides, which all new developers should read (along with the associated docs, including the UI Guidelines and Development Guide). All these bezel gestures are reserved for the OS itself, except the "top-swipe" which is reserved for context menus and such in the apps themselves.
Swipe up from the bottom of the screen to go to home page and swipe down from top of screen for top menu.
Checkout this for more detailed information about using the PlayBook simulator.
http://savagelook.com/blog/portfolio/blackberry-playbook-simulator-tips
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The topic is about system fonts. what is the purpose of setting button {font:caption;}? system-fonts
The question asks what is the purpose of setting button {font:caption;}
The system the user is on (normally a browser like Chrome or Safari together with their device's operating system and related storage) will itself have styles for various different items.
In this case the question is about 'caption' - when used as font:caption as above it is saying to the browser when you see a button element in my HTML please use the same font that you would use to show a button.
This means you can have a website which blends in with the look that the user is used to - buttons (and other things depending on what else you set) will look the same as system ones - in this case at least as far as the font goes.
See https://developer.mozilla.org/en-US/docs/Web/CSS/font for information on what other in-built system formatting can be used.
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I want to create the following design for my app. Note that there's an AppBar on top and some content below it wrapped on a ScrollPane. The icons at the left would change the content shown, taking the user to different sections of the app, e.g: browsing documents, messages, settings, etc. The AppBar at the top would still be the same, only the content in the middle would change. Now there's two ways to do it:
Having a single screen with a ScrollPane, whose children is changed dynamically, so every time an icon is pressed the child changes.
Having multiple screens, when the user clicks an icon, an entire new scene is created.
What are the pros and cons of doing it each way?
It is easier to manage with one Scene. This is typical use case in JavaFX applications with BorderPane. You can create a AppView extends BorderPane and set the Menu/Toolbar in top, your opened View in center and status bar (if you use) in bottom. If requested, you can change only current view in the center of BorderPane.
I have implemented similar AppView, you can check AppView in my JavaFX MVC application demo source code.
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Whenever I try to to use developer options in browser my website automatically starts shrinking
Yes, this is the expected behavior. There is an option to open developer tools in a separate window in most browsers (that can be found in the top-right corner of the developer tools panel in your screenshot).
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Do any of the commonly used screen readers emit browser events that can be scripted with javascript?
Or, are there current or planned javascript APIs to communicate with screen readers in the same way there are now APIs for working with other OS level systems (cameras, GPS, etc.)?
A similar question from three years ago (Evaluating current state of a screen reader in JavaScript) produced a definitive "NO" answer. Has anything changed since then?
I believe, it's still a No, but the closest to your request is the (drafted) Accessibility Object Model. It does not allow to interact with screen readers directly (it seems), but it does allow to manipulate the accessibility tree in a browser.
Currently supported at least in Chrome Canary via a command-line flag.
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I would like to display custom information on my Nexus server, e.g. on the Welcome Screen or in a header. Basically I would like to add useful information for my users, like a contact address specific to my organization in case of issues, or links to guidance documents.
Is there any way to do this?
The branding plugin can be used to update the header image in the top left corner. There is a demo of that you can watch on the Sonatype Youtube Channel. There is no plugin to customize the welcome screen. You would have to write your own plugin to do that.
Update: The branding plugin is part of Nexus Pro only in the Nexus 2 series. The Nexus 3 series introduces a feature to have a completely customizable header and footer.
I have never used it but there is a branding plugin:
http://books.sonatype.com/nexus-book/reference/nexus-branding.html.
Might only apply to Nexus Prodfessional, worth checking out