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CHAPTER 4: User-Interface Tools Automatic layout 97

// Create window using resource spec

win = new Window (res);

// Create list items, select first one

win.whichInfo.onChange = function () {

if (this.selection != null) {

for (var g = 0; g < this.items.length; g++)

this.items[g].group.visible = false;

this.selection.group.visible = true;

}

var item = win.whichInfo.add (’item’, ’Personal Info’);

item.group = win.allGroups.info;

item = win.whichInfo.add (’item’, ’Work Info’);

item.group = win.allGroups.workInfo;

win.whichInfo.selection = win.whichInfo.items[0];

// Override the default layout manager for the ’buttons’ group

// with custom layout manager

win.buttons.layout = new StairStepButtonLayout(win.buttons);

win.center();

win.show();

The AutoLayoutManager algorithm

When a script creates a Window object and its elements and shows it the first time, the visible

user-interface-platform window and controls are created. At this point, if no explicit placement of controls

was specified by the script, all the controls are located at [0, 0] within their containers, and have default

dimensions. Before the window is made visible, the layout manager’s

layout method is called to assign

locations and sizes for all the elements and their containers.

The default

AutoLayoutManager’s layout method performs these steps when invoked during the initial

call to a

Window object’s show method:

1. Read the

bounds property for the managed container; if undefined, proceed with auto layout. If

defined, assume that the script has explicitly placed the elements in this container, and cancel the

layout operation (if both the

location and size property have been set, this is equivalent to setting

the

bounds property, and layout does not proceed).

2. Determine the container’s margins and inter-element spacing from its

margins and spacing

properties, and the orientation and alignment of its child elements from the container’s

orientation

and

alignChildren properties. If any of these properties are undefined, use default settings obtained

from platform and user-interface framework-specific default values.

3. Enumerate the child elements, and for each child:

Z If the child is a container, call its layout manager (that is, execute this entire algorithm again for the

container).

Z Read its alignment property; if defined, override the default alignment established by the parent

container with its

alignChildren property.

Z Read its size property: if defined, use it to determine the child’s dimensions. If undefined, read its

preferredSize property to get the child’s dimensions. Ignore the child’s location property.

All the per-child information is collected for later use.

4. Based on the orientation, calculate the trial location of each child in the row or column, using

inter-element spacing and the container’s margins.

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