Support for more dynamic layouts by evaluation of the rendered attribute in
UICell an UIGridLayout
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Key: TOBAGO-733
URL: https://issues.apache.org/jira/browse/TOBAGO-733
Project: MyFaces Tobago
Issue Type: Improvement
Components: Core
Affects Versions: 1.0.20, 1.0.21, 1.1.0
Environment: Windows XP Professional
Apache Tomcat 6.0.18
Java6 Update 10
MyFaces 1.2.5
Tomahawk 12-1.1.8
Tobago 1.0.20
Reporter: Michael Bauer
Priority: Minor
Some child components of the grid layout might change their rendered state
during user interaction, for example if the user decides to not display a menu
component or an information box etc. In that case the layout should dynamically
devide the given space using appropriate row-/colspans. To achieve this, two
changes would be necessary:
1. Using UICell in a grid layout with dynamic spans:
Let a managed bean support the dynamic layout by calculating the actual cell
spans. Add value bindings to UICell's spanX- and spanY-attributes like this for
example:
public Integer getSpanX() {
ValueBinding spanBinding = getValueBinding( ATTR_SPAN_X );
if(spanBinding != null)
{
Object obj = spanBinding.getValue( getFacesContext() );
if(obj != null && obj instanceof Integer)
{
Integer integer = (Integer) obj;
return integer;
}
}
return spanX;
}
2. Calculating layout in UIGridLayout depending on the rendered state of the
child components (UICells in this case)
If the child would be a cell and the cell would have a (changing!) value
binding for the rendered attribute, the cell and it's contents would not be
rendered - which is OK; However, the place taken by the not rendered cell will
not be filled by the other components, hence leaving an empty space in the
layout...
Checking if a child is rendered before evaluating the grid layout fixes this.
The necessary changes would have to be made in method "private List<Row>
createRows() {" for example like this:
boolean childRendered = component.isRendered();
if(childRendered)
{
rows.get(r).addControl(component, spanX);
rows.get(r).fill(c + 1, c + spanX, component.isRendered());
}
With that, a child component with the attribute rendered set to false will be
ignored in the layout.
The second change would need for a dynamic span-evaluation of the other
components in the same row as suggested in the first change.
Regards,
Michael
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