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Awesome Open Source

FlexLayout

FlexLayout is a layout manager that arranges React components in multiple tab sets, tabs can be resized and moved.

FlexLayout Demo Screenshot

Run the Demo

Try it now using JSFiddle

Screenshot of Caplin Liberator Explorer using FlexLayout

FlexLayout's only dependency is React.

Features:

  • splitters
  • tabs
  • tab dragging and ordering
  • tabset dragging (move all the tabs in a tabset in one operation)
  • dock to tabset or edge of frame
  • maximize tabset (double click tabset header or use icon)
  • tab overflow (show menu when tabs overflow, scroll tabs using mouse wheel)
  • border tabsets
  • popout tabs into new browser windows (only enabled in latest browsers)
  • submodels, allow layouts inside layouts
  • tab renaming (double click tab text to rename)
  • themeing - light, gray and dark
  • touch events - works on mobile devices (iPad, Android)
  • add tabs using drag, indirect drag, add to active tabset, add to tabset by id
  • preferred pixel size tabsets (try to keep their size when window resizes)
  • headed tabsets
  • tab and tabset attributes: enableHeader, enableTabStrip, enableDock, enableDrop...
  • customizable tabs and tabset header rendering
  • esc cancels drag
  • typescript type declarations included
  • supports overriding css class names via the classNameMapper prop, for use in css modules

Installation

FlexLayout is in the npm repository. Simply install React and FlexLayout from npm:

npm install react --save
npm install react-dom --save
npm install flexlayout-react --save

Import React and FlexLayout in your modules:

import React from "react";
import ReactDOM from "react-dom";
import FlexLayout from "flexlayout-react";

Include the light, gray or dark style in your html:

<link rel="stylesheet" href="node_modules/flexlayout-react/style/light.css" />

Usage

The <Layout> component renders the tabsets and splitters, it takes the following props:

Prop Required/Optional Description
model required the layout model
factory required a factory function for creating React components
font optional the tab font (overrides value in css). Example: font={{size:"12px", style:"italic"}}
iconFactory optional a factory function for creating icon components for tab bar buttons
titleFactory optional a factory function for creating title components for tab bar buttons
icons optional object mapping keys among close, maximize, restore, more, popout to React nodes to use in place of the default icons
onAction optional function called whenever the layout generates an action to update the model (allows for intercepting actions before they are dispatched to the model, for example, asking the user to confirm a tab close.) Returning undefined from the function will halt the action, otherwise return the action to continue
onRenderTab optional function called when rendering a tab, allows leading (icon), content section, buttons and name used in overflow menu to be customized
onRenderTabSet optional function called when rendering a tabset, allows header and buttons to be customized
onModelChange optional function called when model has changed
onExternalDrag optional function called when an external object (not a tab) gets dragged onto the layout, with a single dragenter argument. Should return either undefined to reject the drag/drop or an object with keys dragText, json, and optionally onDrop, to create a tab via drag (similar to a call to addTabToTabSet). Function onDrop is passed the added tab Node and the drop DragEvent, unless the drag was canceled.
classNameMapper optional function called with default css class name, return value is class name that will be used. Mainly for use with css modules.
i18nMapper optional function called for each I18nLabel to allow user translation, currently used for tab and tabset move messages, return undefined to use default values
supportsPopout optional if left undefined will do simple check based on userAgent
popoutURL optional URL of popout window relative to origin, defaults to popout.html

The model is tree of Node objects that define the structure of the layout.

The factory is a function that takes a Node object and returns a React component that should be hosted by a tab in the layout.

The model can be created using the Model.fromJson(jsonObject) static method, and can be saved using the model.toJson() method.

this.state = {model: FlexLayout.Model.fromJson(json)};

render() {
	<Layout model={this.state.model} factory={factory}/>
}

Example Configuration:

var json = {
	global: {},
	borders: [],
	layout:{
		"type": "row",
		"weight": 100,
		"children": [
			{
				"type": "tabset",
				"weight": 50,
				"selected": 0,
				"children": [
					{
						"type": "tab",
						"name": "FX",
						"component":"grid",
					}
				]
			},
			{
				"type": "tabset",
				"weight": 50,
				"selected": 0,
				"children": [
					{
						"type": "tab",
						"name": "FI",
						"component":"grid",
					}
				]
			}
		]
	}
};

Example Code

import React from "react";
import ReactDOM from "react-dom";
import FlexLayout from "flexlayout-react";

class Main extends React.Component {

    constructor(props) {
        super(props);
        this.state = {model: FlexLayout.Model.fromJson(json)};
    }

    factory = (node) => {
        var component = node.getComponent();
        if (component === "button") {
            return <button>{node.getName()}</button>;
        }
    }

    render() {
        return (
            <FlexLayout.Layout model={this.state.model} factory={this.factory}/>
        )
    }
}

ReactDOM.render(<Main/>, document.getElementById("container"));

(See the examples for full source code)

The above code would render two tabsets horizontally each containing a single tab that hosts a button component. The tabs could be moved and resized by dragging and dropping. Additional grids could be added to the layout by sending actions to the model.

Try it now using JSFiddle

A simple Create React App (CRA) example (using typescript) can be found here:

https://github.com/nealus/FlexLayout_cra_example

The model is built up using 4 types of 'node':

  • row - rows contains a list of tabsets and child rows, the top level 'row' will render horizontally (unless the global attribute rootOrientationVertical is set) , child 'rows' will render in the opposite orientation to their parent.

  • tabset - tabsets contain a list of tabs and the index of the selected tab

  • tab - tabs specify the name of the component that they should host (that will be loaded via the factory) and the text of the actual tab.

  • border - borders contain a list of tabs and the index of the selected tab, they can only be used in the borders top level element.

The main layout is defined with rows within rows that contain tabsets that themselves contain tabs.

The model json contains 3 top level elements:

  • global - where global options are defined
  • layout - where the main row/tabset/tabs layout hierarchy is defined
  • borders - (optional) where up to 4 borders are defined ("top", "bottom", "left", "right").

Weights on rows and tabsets specify the relative weight of these nodes within the parent row, the actual values do not matter just their relative values (ie two tabsets of weights 30,70 would render the same if they had weights of 3,7).

NOTE: the easiest way to create your initial layout JSON is to use the demo app, modify one of the existing layouts by dragging/dropping and adding nodes then press the 'Show Layout JSON in console' button to print the JSON to the browser developer console.

example borders section:

	"borders": [
		 {
		    "type":"border",
		 	"location": "left",
			"children": [
				{
					"type": "tab",
					"enableClose":false,
					"name": "Navigation",
					"component": "grid",
				}
			]
		},
		{
		    "type":"border",
		 	"location": "right",
			"children": [
				{
					"type": "tab",
					"enableClose":false,
					"name": "Options",
					"component": "grid",
				}
			]
		},
		{
		    "type":"border",
			"location": "bottom",
			"children": [
				{
					"type": "tab",
					"enableClose":false,
					"name": "Activity Blotter",
					"component": "grid",
				},
				{
					"type": "tab",
					"enableClose":false,
					"name": "Execution Blotter",
					"component": "grid",
				}
			]
		}
	]

To control where nodes can be dropped you can add a callback function to the model:

model.setOnAllowDrop(this.allowDrop);

example:

    allowDrop(dragNode, dropInfo) {
        let dropNode = dropInfo.node;

        // prevent non-border tabs dropping into borders
        if (dropNode.getType() == "border" && (dragNode.getParent() == null || dragNode.getParent().getType() != "border"))
            return false;

        // prevent border tabs dropping into main layout
        if (dropNode.getType() != "border" && (dragNode.getParent() != null && dragNode.getParent().getType() == "border"))
            return false;

        return true;
    }

By changing global or node attributes you can change the layout appearance and functionality, for example:

Setting tabSetEnableTabStrip:false in the global options would change the layout into a multi-splitter (without tabs or drag and drop).

 global: {tabSetEnableTabStrip:false},

Floating Tabs (Popouts)

Note: this feature only works for Chrome, Firefox, Safari, latest Edge (the Chrome based one) and Opera, it does NOT work for any version of IE or the previous version of Edge. For unsupported browsers the popout icons will not be shown and any saved layout with popouts will show with all their tabs in the main layout.

For supported browsers tabs can be rendered into external browser windows (for use in multi-monitor setups) by configuring them with the enableFloat attribute. When this attribute is present an additional icon is shown in the tab header bar allowing the tab to be popped out into an external window.

For popouts to work there needs to be an additional html page 'popout.html' hosted at the same location as the main page (copy the one from examples/demo). The popout.html is the host page for the popped out tab, the styles from the main page will be copied into it at runtime.

Because popouts are rendering into a different document to the main layout any code in the popped out tab that uses the global document or window objects will not work correctly (for example custom popup menus), they need to instead use the document/window of the popout. To get the document/window of the popout use the following method on one of the elements rendered in the popout (for example a ref or target in an event handler):

    const currentDocument = this.selfRef.current.ownerDocument;
    const currentWindow = currentDocument.defaultView!;

In the above code selfRef is a React ref to the toplevel element in the tab being rendered.

Note: some libraries already support popout windows by allowing you to specify the document to use, for example see the getDocument() callback in agGrid at https://www.ag-grid.com/javascript-grid-callbacks/

Global Config attributes

Attributes allowed in the 'global' element

Attribute Default Description
splitterSize 8 width in pixels of all splitters between tabsets/borders
enableEdgeDock true
tabEnableClose true allow user to close all tabs via close button
tabCloseType 1 see values in ICloseType
tabEnableDrag true allow user to drag all tabs to new location
tabEnableRename true allow user to rename all tabs by double clicking
tabEnableFloat false enable popouts in all tabs (in popout capable browser)
tabClassName null
tabIcon null
tabEnableRenderOnDemand true whether to avoid rendering component until tab is visible
tabDragSpeed 0.3 CSS transition speed of drag outlines (in seconds)
tabSetEnableDeleteWhenEmpty true
tabSetEnableDrop true allow user to drag tabs into all tabsets
tabSetEnableDrag true allow user to drag tabs out of all tabsets
tabSetEnableDivide true allow user to drag tabs to region of all tabsets, splitting into new tabset
tabSetEnableMaximize true allow user to maximize all tabsets to fill view via maximize button
tabSetAutoSelectTab true whether to select new/moved tabs in all tabsets
tabSetClassNameTabStrip null height in pixels of tab strips in all tabsets
tabSetClassNameHeader null
tabSetEnableTabStrip true enable tab strip and allow multiple tabs in all tabsets
tabSetHeaderHeight 0 height of tabset header in pixels; if left as 0 then the value will be calculated from the current fontSize
tabSetTabStripHeight 0 height of tabset tab bar in pixels; if left as 0 then the value will be calculated from the current fontSize
borderBarSize 0 size of the border bars in pixels; if left as 0 then the value will be calculated from the current fontSize
borderEnableDrop true allow user to drag tabs into this border
borderAutoSelectTabWhenOpen true whether to select new/moved tabs in border when the border is already open
borderAutoSelectTabWhenClosed false whether to select new/moved tabs in border when the border is curently closed
borderClassName null
borderSize 200 initial width in pixels for left/right borders, height for top/bottom borders
borderMinSize 0 minimum width in pixels for left/right borders, height for top/bottom borders
tabSetMinHeight 0 minimum width (in px) for all tabsets
tabSetMinWidth 0 minimum height (in px) for all tabsets
tabSetTabLocation top show tabs in location top or bottom
rootOrientationVertical false the top level 'row' will layout horizontally by default, set this option true to make it layout vertically

Row Attributes

Attributes allowed in nodes of type 'row'.

Attribute Default Description
type row
weight 100
width null preferred pixel width
height null preferred pixel height
children required a list of row and tabset nodes

Tab Attributes

Attributes allowed in nodes of type 'tab'.

Inherited defaults will take their value from the associated global attributes (see above).

Attribute Default Description
type tab
name required internal unique string identifying tab (for factory)
component required string identifying which component to run (for factory)
config null a place to hold json config for the hosted component
id auto generated
enableClose inherited allow user to close tab via close button
closeType inherited see values in ICloseType
enableDrag inherited allow user to drag tab to new location
enableRename inherited allow user to rename tabs by double clicking
enableFloat inherited enable popout (in popout capable browser)
floating false
className inherited
icon inherited
enableRenderOnDemand inherited whether to avoid rendering component until tab is visible

Tab nodes have a getExtraData() method that initially returns an empty object, this is the place to add extra data to a tab node that will not be saved.

TabSet Attributes

Attributes allowed in nodes of type 'tabset'.

Inherited defaults will take their value from the associated global attributes (see above).

Note: tabsets can be dynamically created as tabs are moved and deleted when all their tabs are removed (unless enableDeleteWhenEmpty is false).

Attribute Default Description
type tabset
weight 100 relative weight for sizing of this tabset in parent row
width null preferred pixel width
height null preferred pixel height
name null named tabsets will show a header bar above the tabs
config null a place to hold json config used in your own code
selected 0 index of selected/visible tab in tabset
maximized false whether tabset is currently maximized to fill view
id auto generated
children required a list of tab nodes
enableDeleteWhenEmpty inherited
enableDrop inherited allow user to drag tabs into this tabset
enableDrag inherited allow user to drag tabs out this tabset
enableDivide inherited allow user to drag tabs to region of this tabset, splitting into new tabset
enableMaximize inherited allow user to maximize tabset to fill view via maximize button
autoSelectTab inherited whether to select new/moved tabs in tabset
classNameTabStrip inherited
classNameHeader inherited
enableTabStrip inherited enable tab strip and allow multiple tabs in this tabset
headerHeight inherited
tabStripHeight inherited height in pixels of tab strip
tabLocation inherited show tabs in location top or bottom
minHeight inherited minimum width (in px) for this tabset
minWidth inherited minimum height (in px) for this tabset

Border Attributes

Attributes allowed in nodes of type 'border'.

Inherited defaults will take their value from the associated global attributes (see above).

Attribute Default Description
type border
size inherited size of the tab body when selected
minSize inherited
selected -1 index of selected/visible tab in border; -1 means no tab unselected / border closed
id auto generated border_ + border name e.g. border_left
config null a place to hold json config used in your own code
show true show/hide this border
children required a list of tab nodes
barSize inherited size of this border's bar in pixels; if left as 0 then the value will be calculated from the current fontSize
enableDrop inherited
autoSelectTabWhenOpen inherited whether to select new/moved tabs in border when the border is already open
autoSelectTabWhenClosed inherited whether to select new/moved tabs in border when the border is currently closed
className inherited

Model Actions

All changes to the model are applied through actions. You can intercept actions resulting from GUI changes before they are applied by implementing the onAction callback property of the Layout. You can also apply actions directly using the Model.doAction() method. This method takes a single argument, created by one of the following action generators (typically accessed as FlexLayout.Actions.<actionName>):

Action Creator Description
Actions.addNode(newNodeJson, toNodeId, location, index, select?) add a new tab node to the given tabset node; select specifies whether to select new tab, defaulting to autoSelectTab attribute; returns the created Node
Actions.moveNode(fromNodeId, toNodeId, location, index, select?) move a tab node from its current location to the new node and location; select specifies whether to select tab, defaulting to new tabset's autoSelectTab attribute
Actions.deleteTab(tabNodeId) delete the given tab
Actions.renameTab(tabNodeId, newName) rename the given tab
Actions.selectTab(tabNodeId) select the given tab
Actions.setActiveTabset(tabsetNodeId) set the tabset as the active tabset
Actions.adjustSplit(splitterNodeId, value) adjust the size of the given splitter
Actions.adjustBorderSplit(borderNodeId, pos) updates the size of the given border node
Actions.maximizeToggle(tabsetNodeId) toggles whether the given tabset node is maximized
Actions.updateModelAttributes(attributes) updates the global attributes
Actions.updateNodeAttributes(nodeId, attributes) updates the attributes of the given node
Actions.floatTab(nodeId) popout the tab into a floating browser window
Actions.unFloatTab(nodeId) restore a popped out tab to the main layout

Examples

model.doAction(FlexLayout.Actions.updateModelAttributes({
    splitterSize:40,
    tabSetHeaderHeight:40,
    tabSetTabStripHeight:40
}));

The above example would increase the size of the splitters, tabset headers and tabs, this could be used to make adjusting the layout easier on a small device.

model.doAction(FlexLayout.Actions.addNode(
    {type:"tab", component:"grid", name:"a grid", id:"5"},
    "1", FlexLayout.DockLocation.CENTER, 0));

This example adds a new grid component to the center of tabset with id "1" and at the 0'th tab position (use value -1 to add to the end of the tabs). Note: you can get the id of a node (e.g., the node returned by the addNode action) using the method node.getId(). If an id wasn't assigned when the node was created, then one will be created for you of the form #<next available id> (e.g. #1, #2, ...).

Layout Component Methods to Create New Tabs

Methods on the Layout Component for adding tabs, the tabs are specified by their layout json.

Example:

this.layoutRef.current.addTabToTabSet("NAVIGATION", {type:"tab", component:"grid", name:"a grid"});

This would add a new grid component to the tabset with id "NAVIGATION" (where this.layoutRef is a ref to the Layout element, see https://reactjs.org/docs/refs-and-the-dom.html ).

Layout Method Description
addTabToTabSet(tabsetId, json) adds a new tab to the tabset with the given Id
addTabToActiveTabSet(json) adds a new tab to the active tabset
addTabWithDragAndDrop(dragText, json, onDrop) adds a new tab by dragging a marker to the required location, with the drag starting immediately; on success, onDrop is passed the created tab Node; on cancel, no arguments are passed
addTabWithDragAndDropIndirect(dragText, json, onDrop) adds a new tab by dragging a marker to the required location, the marker is shown and must be clicked on to start dragging

Tab Node Events

You can handle events on nodes by adding a listener, this would typically be done in the components constructor() method.

Example:

    constructor(props) {
        super(props);
        let config = this.props.node.getConfig();

        // save state in flexlayout node tree
        this.props.node.setEventListener("save", (p) => {
             config.subject = this.subject;
        };
    }

Event parameters Description
resize called when tab is resized during layout, called before it is rendered with the new size
close called when a tab is closed
visibility called when the visibility of a tab changes
save called before a tabnode is serialized to json, use to save node config by adding data to the object returned by node.getConfig()

Running the Examples and Building the Project

First install dependencies:

yarn install

Install the peer dependencies:

yarn add react
yarn add react-dom

Compile the project and run the examples:

yarn start

Open your browser at http://localhost:8080/examples/ to show the examples directory, click on the examples to run them.

The 'yarn start' command will watch for changes to flexlayout and example source, so you can make changes to the code and then refresh the browser to see the result.

To build the npm distribution run 'yarn build', this will create the artifacts in the dist dir.


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