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https://issues.apache.org/jira/browse/WICKET-3568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Emond Papegaaij updated WICKET-3568:
------------------------------------
Description:
We are trying to migrate our projects from overriding isVisible and isEnabled
to the new onConfigure method, but are having some problems with the new API.
I'll start with explaining the old situation. We find it good practice to
always call super.isVisible() in an overriding isVisible method. A typical
implementation would look like this:
public class MyComponent extends WebMarkupContainer {
public boolean isVisible() {
return super.isVisible() && isConditionSatisfied();
}
}
Doing things this way, ensures the component will never be visible when the
condition is not satisfied, nor when the component is explicitly hidden with
setVisible(false).
Trying to convert this to the new API, we started with:
public class MyComponent extends WebMarkupContainer {
protected void onConfigure() {
super.onConfigure();
setVisible(isVisible() && isConditionSatisfied());
}
}
However, we soon realized this will not work because a hidden component can
never become visible again. Even when the condition is satisfied, isVisible()
will still be false, causing the component to remain hidden. Therefore, our
second attempt was to remove the call to isVisible():
public class MyComponent extends WebMarkupContainer {
protected void onConfigure() {
super.onConfigure();
setVisible(isConditionSatisfied());
}
}
This, however, suffers from another problem: manual setVisible(...) calls are
now ignored. The visibility flag is always overridden by onConfigure. On our
third attempt, we decided to use the visibilityAllowed flag for onConfigure,
like this:
public class MyComponent extends WebMarkupContainer {
protected void onConfigure() {
super.onConfigure();
setVisibilityAllowed(isConditionSatisfied());
}
}
This works great. It mixes with calls to setVisible. It even mixes well with
isVisible overrides in subclasses. However, this approach only works for
component visibility. There is no setEnabledAllowed. There is a
isEnableAllowed(), but it is security related (the counterpart of
isRenderAllowed()).
Would it be possible to add a new property to Component (both in 1.4 and 1.5):
enabledAllowed? This property would have a final getter (isEnabledAllowed) and
setter (setEnabledAllowed), just as with visibilityAllowed. The naming of
isEnableAllowed() would be a bit unfortunate, but I don't think that method can
be changed. It is part of the public API. This new property would make it
significantly easier to move to onConfigure.
was:
We are trying to migrate our projects from overriding isVisible and isEnabled
to the new onConfigure method, but are having some problems with the new API.
I'll start with explaining the old situation. We find it good practice to
always call super.isVisible() in an overriding isVisible method. A typical
implementation would look like this:
public class MyComponent extends WebMarkupContainer {
public boolean isVisible() {
return super.isVisible() && isConditionSatisfied();
}
}
Doing things this way, ensures the component will never be visible when the
condition is not satisfied, nor when the component is explicitly hidden with
setVisible(false).
Trying to convert this to the new API, we started with:
public class MyComponent extends WebMarkupContainer {
protected void onConfigure() {
super.onConfigure();
setVisible(isVisible() && isConditionSatisfied());
}
}
However, we soon realized this will not work because a hidden component can
never become visible again. Even when the condition is satisfied, isVisible()
will still be false, causing the component to remain hidden. Therefore, our
second attempt was to remove the call to isVisible():
public class MyComponent extends WebMarkupContainer {
protected void onConfigure() {
super.onConfigure();
setVisible(isConditionSatisfied());
}
}
This, however, suffers from another problem: manual setVisible(...) calls are
now ignored. The visibility flag is always overridden by onConfigure. On our
third attempt, we decided to use the visibilityAllowed flag for onConfigure,
like this:
public class MyComponent extends WebMarkupContainer {
protected void onConfigure() {
super.onConfigure();
setVisibilityAllowed(isConditionSatisfied());
}
}
This works great. It mixes with calls to setVisible. It even mixes well with
isVisible overrides in subclasses. However, this approach only works for
component visibility. There is no setEnabledAllowed. There is a
isEnableAllowed(), but it is security related (the counterpart of
isRenderAllowed()).
Would it be possible to add a new property to Component (both in 1.4 and 1.5):
enabledAllowed? This property would have a final getter (isEnabledAllowed) and
setter (setEnabledAllowed), just as with visibilityAllowed. The naming of
isEnableAllowed() would be a bit unfortunate, but I don't think that method
can be changed. It is part of the public API. This new property would make it
significantly easier to move to onConfigure.
> New methods to ease migration to onConfigure
> --------------------------------------------
>
> Key: WICKET-3568
> URL: https://issues.apache.org/jira/browse/WICKET-3568
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-core
> Affects Versions: 1.4.16, 1.5-RC2
> Reporter: Emond Papegaaij
>
> We are trying to migrate our projects from overriding isVisible and isEnabled
> to the new onConfigure method, but are having some problems with the new API.
> I'll start with explaining the old situation. We find it good practice to
> always call super.isVisible() in an overriding isVisible method. A typical
> implementation would look like this:
> public class MyComponent extends WebMarkupContainer {
> public boolean isVisible() {
> return super.isVisible() && isConditionSatisfied();
> }
> }
> Doing things this way, ensures the component will never be visible when the
> condition is not satisfied, nor when the component is explicitly hidden with
> setVisible(false).
> Trying to convert this to the new API, we started with:
> public class MyComponent extends WebMarkupContainer {
> protected void onConfigure() {
> super.onConfigure();
> setVisible(isVisible() && isConditionSatisfied());
> }
> }
> However, we soon realized this will not work because a hidden component can
> never become visible again. Even when the condition is satisfied, isVisible()
> will still be false, causing the component to remain hidden. Therefore, our
> second attempt was to remove the call to isVisible():
> public class MyComponent extends WebMarkupContainer {
> protected void onConfigure() {
> super.onConfigure();
> setVisible(isConditionSatisfied());
> }
> }
> This, however, suffers from another problem: manual setVisible(...) calls are
> now ignored. The visibility flag is always overridden by onConfigure. On our
> third attempt, we decided to use the visibilityAllowed flag for onConfigure,
> like this:
> public class MyComponent extends WebMarkupContainer {
> protected void onConfigure() {
> super.onConfigure();
> setVisibilityAllowed(isConditionSatisfied());
> }
> }
> This works great. It mixes with calls to setVisible. It even mixes well with
> isVisible overrides in subclasses. However, this approach only works for
> component visibility. There is no setEnabledAllowed. There is a
> isEnableAllowed(), but it is security related (the counterpart of
> isRenderAllowed()).
> Would it be possible to add a new property to Component (both in 1.4 and
> 1.5): enabledAllowed? This property would have a final getter
> (isEnabledAllowed) and setter (setEnabledAllowed), just as with
> visibilityAllowed. The naming of isEnableAllowed() would be a bit
> unfortunate, but I don't think that method can be changed. It is part of the
> public API. This new property would make it significantly easier to move to
> onConfigure.
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