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package org.openslx.dozmod.gui.changemonitor;
import java.util.Comparator;
/**
* Control/element wrapper
*/
public abstract class AbstractControlWrapper<T> {
private final DialogChangeMonitor dcm;
protected boolean wasEverChanged;
protected boolean isCurrentlyChanged;
protected boolean isValid = true;
private T originalContent;
private final DialogChangeMonitor.ValidationConstraint<T> constraint;
private final Comparator<T> cmp;
protected final String constraintErrorMessage;
/**
* If muted, this wrapper will not react to changes of the underlying
* control.
*/
private boolean muted = false;
protected AbstractControlWrapper(DialogChangeMonitor dcm, String errorMessage, Comparator<T> comp,
DialogChangeMonitor.ValidationConstraint<T> cons) {
this.dcm = dcm;
this.constraintErrorMessage = errorMessage;
this.cmp = comp;
this.constraint = cons;
}
public boolean hasChangedSinceInit() {
return wasEverChanged;
}
public boolean isCurrentlyChanged() {
return isCurrentlyChanged;
}
/**
* Resets the change state of this control
* and removes the "muted" flag, if set.
*/
public void reset() {
boolean wasChanged = wasEverChanged;
resetChangeState();
if (wasChanged) {
// It's possible that the global change state changed
dcm.contentChanged(this);
}
}
protected final void resetChangeState() {
muted = false;
isCurrentlyChanged = wasEverChanged = false;
originalContent = getCurrentValue();
checkValid(originalContent);
}
/**
* To be called by the implementation whenever the content of the control
* changed and according checks should be triggered.
*/
protected final void contentChanged() {
T text = getCurrentValue();
checkChanged(text);
checkValid(text);
}
/**
* Ignore any changes, don't trigger callbacks regarding
* this component. This flag can be removed by calling
* reset() on this ControlWrapper or the enclosing
* DialogChangeMonitor.
*/
public void mute() {
muted = true;
}
/**
* Method MUST return the current value of the monitored component, so
* that the current state can be considered as the original unmodified
* state.
*/
abstract T getCurrentValue();
protected void checkChanged(T newContent) {
if (muted)
return;
final boolean changed;
if (cmp == null) {
if (originalContent == null) {
if (newContent == null) {
changed = false;
} else {
changed = true;
}
} else {
changed = !originalContent.equals(newContent);
}
} else {
changed = cmp.compare(originalContent, newContent) != 0;
}
if (isCurrentlyChanged != changed) {
isCurrentlyChanged = changed;
dcm.contentChanged(this);
}
}
protected void checkValid(T text) {
if (muted)
return;
boolean valid = constraint == null || constraint.isValid(text);
if (isValid != valid) {
isValid = valid;
dcm.validityChanged(this);
}
}
}
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