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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.eclipse.org/org/documents/epl-v10.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.eclipse.adt.internal.editors.uimodel;
import com.android.ide.eclipse.adt.internal.editors.descriptors.AttributeDescriptor;
import org.w3c.dom.Node;
/**
* Represents an XML attribute in that can be modified using a simple text field
* in the XML editor's user interface.
* <p/>
* The XML attribute has no default value. When unset, the text field is blank.
* When updating the XML, if the field is empty, the attribute will be removed
* from the XML element.
* <p/>
* See {@link UiAttributeNode} for more information.
*/
public abstract class UiAbstractTextAttributeNode extends UiAttributeNode
implements IUiSettableAttributeNode {
protected static final String DEFAULT_VALUE = ""; //$NON-NLS-1$
/** Prevent internal listener from firing when internally modifying the text */
private boolean mInternalTextModification;
/** Last value read from the XML model. Cannot be null. */
private String mCurrentValue = DEFAULT_VALUE;
public UiAbstractTextAttributeNode(AttributeDescriptor attributeDescriptor,
UiElementNode uiParent) {
super(attributeDescriptor, uiParent);
}
/** Returns the current value of the node. */
@Override
public final String getCurrentValue() {
return mCurrentValue;
}
/** Sets the current value of the node. Cannot be null (use an empty string). */
@Override
public final void setCurrentValue(String value) {
mCurrentValue = value;
}
/** Returns if the attribute node is valid, and its UI has been created. */
public abstract boolean isValid();
/** Returns the text value present in the UI. */
public abstract String getTextWidgetValue();
/** Sets the text value to be displayed in the UI. */
public abstract void setTextWidgetValue(String value);
/**
* Updates the current text field's value when the XML has changed.
* <p/>
* The caller doesn't really know if attributes have changed,
* so it will call this to refresh the attribute anyway. The value
* is only set if it has changed.
* <p/>
* This also resets the "dirty" flag.
*/
@Override
public void updateValue(Node xml_attribute_node) {
mCurrentValue = DEFAULT_VALUE;
if (xml_attribute_node != null) {
mCurrentValue = xml_attribute_node.getNodeValue();
}
if (isValid() && !getTextWidgetValue().equals(mCurrentValue)) {
try {
mInternalTextModification = true;
setTextWidgetValue(mCurrentValue);
setDirty(false);
} finally {
mInternalTextModification = false;
}
}
}
/* (non-java doc)
* Called by the user interface when the editor is saved or its state changed
* and the modified attributes must be committed (i.e. written) to the XML model.
*/
@Override
public void commit() {
UiElementNode parent = getUiParent();
if (parent != null && isValid() && isDirty()) {
String value = getTextWidgetValue();
if (parent.commitAttributeToXml(this, value)) {
mCurrentValue = value;
setDirty(false);
}
}
}
protected final boolean isInInternalTextModification() {
return mInternalTextModification;
}
protected final void setInInternalTextModification(boolean internalTextModification) {
mInternalTextModification = internalTextModification;
}
}
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