| static PropertyDescriptor Validator-problems [message #232695] |
Thu, 05 April 2007 10:15 |
Eclipse User |
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Originally posted by: unidad.gmx.net
Hi NG!
I'm building a little GEF-app and use a code similar to the Shapes-Example.
In a Shapes-Example-GEF-model-element there are properties that can be
displayed in the standard-RCP-properties-view, if the model-element is
selected in the editor. Now there is one big problem I can't solve:
The properties of one model-element displayed in properties-view are
described via an static array of IPropertyDescriptor in the
model-element. (I attached the Shapes-example-code of this passage at
the bottom.)
Further every static IPropertyDescriptor gets one Validator that checks
for example, if an input in the properties-view is a number.
Now I want a check, that considers context-information in the check.
For example I want to check whether X (Property XPOS_PROP) of this
model-element is smaller than Y (Property YPOS_PROP) of this
model-element. For this static Validators don't do it.
In the validator I need information about the selected model-element here.
First solution coming to my mind:
Make the array of IPropertyDescriptor non static and so every
model-element has its own IPropertyDescriptor-objects and
also its own Validator-objects.
But this doesn't work because I use object-serializing to save my
editor-input. And I may not serialize the class
org.eclipse.ui.views.properties.TextPropertyDescriptor
Any other idea how I could perform context-sensitive checks
on a PropertyDescriptor?
Best regards, Ralf
/*
* Initializes the property descriptors array.
* @see #getPropertyDescriptors()
* @see #getPropertyValue(Object)
* @see #setPropertyValue(Object, Object)
*/
static {
descriptors = new IPropertyDescriptor[] {
new TextPropertyDescriptor(XPOS_PROP, "X"),
new TextPropertyDescriptor(YPOS_PROP, "Y"),
new TextPropertyDescriptor(WIDTH_PROP, "Width"),
new TextPropertyDescriptor(HEIGHT_PROP, "Height"),
};
// use a custom cell editor validator for all four array entries
for (int i = 0; i < descriptors.length; i++) {
((PropertyDescriptor) descriptors[i]).setValidator(new
ICellEditorValidator() {
public String isValid(Object value) {
int intValue = -1;
try {
intValue = Integer.parseInt((String) value);
} catch (NumberFormatException exc) {
return "Not a number";
}
return (intValue >= 0) ? null : "Value must be >= 0";
}
});
}
} // static
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