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Brief Overview

In Theme Builder 3.0 and above, you can use the Layout Manager to attach a layout to another layout (the "parent" layout) in order to inherit settings from that parent layout as shown below:

Let's take a look at what the TESTLAYOUT, CHILDLAYOUT and CHILDCHILD layouts look like:

The CHILDLAYOUT layout inherits all the settings of TESTLAYOUT but it sets the background colour to orange and also adds a right sidebar (RSB).

Likewise, the CHILDCHILD layout inherits all the settings of the CHILDLAYOUT but adds a left sidebar (LSB).

This is in essence what hierarchical layouts are all about. The most common scenario is that you'll want to make a layout that has the general design required by your organisation, but then have other layouts that look similar but change things such as navigation, which panels are shown, colours, etc.

If you change a setting in a parent layout then, as long as the child layouts don't override that setting, all the child layouts will immediately be updated to reflect the change:

As you can see, we've set the TESTLAYOUT page background colour to red and the menu bar background colour to blue.

Because the CHILDLAYOUT layout alrady overrides the page background colour (it sets it to orange), both it and the CHILDCHILD layout still have an orange background.

However, neither CHILDLAYOUT or CHILDCHILD layouts override the background colour of the menu bar so both of them now have a blue menu bar.

The "Root" Layout

All hierarchical structures have to start somewhere and in our case it's the DEFAULT layout. This contains a basic design (based on the default design of Builder 2.0.x for backwards compatibility) and is the foundation for all the other layouts.

In most cases this won't be the design you want for your wiki but it's a useful starting point for your own designs. To prevent space administrators from choosing the root layout you can restrict who can select the layout on the Permissions Tab.

Which Settings Are Inherited?

Well, pretty much all of them! Any setting that has a "Use Default..." link can inherit from the same setting in the parent layout.

You'll find the "Use Default..." links on options in every single tab in the Layout Manager and all the menus in the Panel Editor.

Defaulting Settings

As shown earlier, we set the page background colour of the CHILDLAYOUT layout (which was done using the Panel Editor) to orange. To revert to the default setting (ie. the colour selected in the TESTLAYOUT layout) we just click the "Use Default..." link as shown below:

And the result... All the backgrounds go red:

If desired, you can set all the settings back to default (ie. make everything in your layout inherit from its parent layout) using the "Revert" button on the Toolbar.

Inherit Settings

This is discussed elsewhere, but let's just recap here to avoid confusion...

You will probably have noticed the "Inherit" option on the menu shown above - it's just above the "Use Default..." option.

The "Inherit" and "Use Default..." options are two very different things.

• Use Default - inherit from the same setting in the parent layout
• Inherit - inherit from the parent HTML element within the current layout

For example, you can see that the background colour of the right sidebar (RSB) is different to that of the page. Because the right sidebar is within the page panel, if you select "Inherit" then the right sidebar would become the same colour as the page panel in the current layout. If you change the colour of the page panel, the sidebar colour would also be changed.

The "Inherit" setting only found within the Panel Editor, the "Use Default..." setting is found almost everywhere within the Layout Manager.

FAQ's

See Also

• Layout Manager - the part of Theme Builder where these settings are found
• Available Layouts - more information on how you can interact with the "Available Layouts" panel including it's toolbar and also some neat drag-and-drop features
• Imports, Panel CSS and Custom CSS - CSS inheritance in layouts works slightly differently to everything else...