App Bar

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The App Bar is a row of app buttons, each with an icon and a label, that takes the operator to another page. It is meant for switching between the applications of an integrated system — navigation, machinery, cargo — rather than between the pages of one application. It is found in the App - OpenBridge section of the Perspective Component Palette as App Bar.

Each button is one entry of items. The button of the app the operator is in is highlighted. See Items.

The App Bar belongs with the Integration Bar, and has the same dark background. Place it in a docked view that is shared by all pages, so it stays in place while the operator moves between them. See App Components — Overview for how docked views are used.

An App Bar dropped from the palette has no items, and is an empty bar:

Items

items is the list of apps. Each item is an object:

Name	Description	Property Type
label	Text under the icon.	value
path	URL of the page to go to, as in Page Configuration, for example /machinery.	value
icon	Icon of the button, chosen with the icon picker.	object
tooltip	A tooltip shown when the pointer is over the button. See Tooltip.	object

A click on a button navigates to its path. The App Bar has no component events.

Current Page

A button is shown as selected when the URL of the current page starts with its path. The button of /tanks is therefore also selected on /tanks/ballast, so that an app stays selected on all of its pages:

Because of this, give every app its own first path segment:

• An item with the path / is selected on every page.
• An item with an empty path is also selected on every page.
• /tank is selected on /tanks too, since it is compared as text.

Properties

Name	Description	Property Type
items	The apps. Empty by default.	array

---

Labels

Set showLabel to false to show the icons only. The bar is then 48 px high instead of 60 px.

showLabel
true (default)
false

Properties

Name	Description	Property Type
showLabel	Show the label under each icon. Default true.	value

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Size

The bar is as wide as the component’s box (the blue frame) and has its own height, from the top of the box. The buttons are centred in it and all have the width of the widest label:

The bar does not shorten or wrap its buttons. A new App Bar is 160 px wide, which is too narrow for more than two apps with labels, and the buttons then stick out of the bar. Make the component wide enough for its items:

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Tooltip

Each item can have a tooltip, set in the tooltip object of the item. tooltip.version selects the kind:

• native (default) — a Perspective tooltip. It is shown when tooltip.enabled is true and tooltip.text is not empty.
• openbridge — an OpenBridge tooltip. It is always shown while the pointer is over the button.

tooltip sub-properties for native:

Name	Description	Property Type
enabled	Show the tooltip. Default false.	value
text	Text of the tooltip.	value
delay	Milliseconds the pointer rests on the button before the tooltip is shown. Default 0.	value
sustain	Milliseconds the tooltip stays. 0 keeps it until the pointer leaves. Default 4000.	value
location	Where the tooltip is placed relative to the button. See the list below. Default bottom.	value
tail	Draw a tail that points at the button. Default true.	value
style	Standard Perspective style object, applied to the tooltip.	object

The values of location are top, top-left, top-right, center, center-left, center-right, bottom, bottom-left and bottom-right.

tooltip sub-properties for openbridge:

Name	Description	Property Type
type	label or icon. Default label.	value
variant	The colour of the tooltip. See the list below. Default normal.	value
label	Text of the tooltip.	value
showIcon	Show an icon in the tooltip. Default false.	value
icon	The icon, chosen with the icon picker. Only shown when showIcon is true.	object
style	Standard Perspective style object; its classes are applied to the tooltip.	object

The values of variant are normal, raised, enhanced, eco, alarm, warning and caution.

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Properties

Properties not covered in the sections above:

Name	Description	Property Type
style	Standard Perspective style object.	object

Component Events

The App Bar has no component events. It navigates by itself when the operator clicks a button.

Note: In the Designer, navigating does nothing, because the Designer shows a view and not a page. Test the App Bar in a session.

Examples

Example 1 — App Bar in a Bottom Dock

1. Create a view Framework/Apps, 60 px high, and add an App Bar as its only component, as wide as the view.

2. Set items:

   [
     {
       "label": "Overview",
       "path": "/overview",
       "icon": {"path": "openbridge/home"}
     },
     {
       "label": "Machinery",
       "path": "/machinery",
       "icon": {"path": "openbridge/generator"}
     },
     {"label": "Tanks", "path": "/tanks", "icon": {"path": "openbridge/tank"}}
   ]

3. In Page Configuration → Shared Settings, add a bottom dock with this view, Display visible, Size 60 and Content push.

4. Give the pages of each app URLs below its path: /machinery, /machinery/propulsion, /machinery/power.

The button of an app is now selected on every page of that app.