/*
* 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.editors.manifest.pages;
import com.android.ide.eclipse.adt.AdtPlugin;
import com.android.ide.eclipse.adt.sdk.Sdk;
import com.android.ide.eclipse.editors.descriptors.DescriptorsUtils;
import com.android.ide.eclipse.editors.manifest.ManifestEditor;
import com.android.ide.eclipse.editors.ui.UiElementPart;
import com.android.ide.eclipse.editors.uimodel.IUiUpdateListener;
import com.android.ide.eclipse.editors.uimodel.UiElementNode;
import com.android.ide.eclipse.editors.uimodel.IUiUpdateListener.UiUpdateState;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.forms.IManagedForm;
import org.eclipse.ui.forms.widgets.FormText;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.Section;
import org.eclipse.ui.forms.widgets.TableWrapData;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
/**
* Appllication Toogle section part for application page.
*/
final class ApplicationToggle extends UiElementPart {
/** Checkbox indicating whether an application node is present */
private Button mCheckbox;
/** Listen to changes to the UI node for <application> and updates the checkbox */
private AppNodeUpdateListener mAppNodeUpdateListener;
/** Internal flag to know where we're programmatically modifying the checkbox and we want to
* avoid triggering the checkbox's callback. */
public boolean mInternalModification;
private FormText mTooltipFormText;
public ApplicationToggle(Composite body, FormToolkit toolkit, ManifestEditor editor,
UiElementNode applicationUiNode) {
super(body, toolkit, editor, applicationUiNode,
"Application Toggle",
null, /* description */
Section.TWISTIE | Section.EXPANDED);
}
@Override
public void dispose() {
super.dispose();
if (getUiElementNode() != null && mAppNodeUpdateListener != null) {
getUiElementNode().removeUpdateListener(mAppNodeUpdateListener);
mAppNodeUpdateListener = null;
}
}
/**
* Changes and refreshes the Application UI node handle by the this part.
*/
@Override
public void setUiElementNode(UiElementNode uiElementNode) {
super.setUiElementNode(uiElementNode);
updateTooltip();
// Set the state of the checkbox
mAppNodeUpdateListener.uiElementNodeUpdated(getUiElementNode(),
UiUpdateState.CHILDREN_CHANGED);
}
/**
* Create the controls to edit the attributes for the given ElementDescriptor.
* <p/>
* This MUST not be called by the constructor. Instead it must be called from
* <code>initialize</code> (i.e. right after the form part is added to the managed form.)
*
* @param managedForm The owner managed form
*/
@Override
protected void createFormControls(IManagedForm managedForm) {
FormToolkit toolkit = managedForm.getToolkit();
Composite table = createTableLayout(toolkit, 1 /* numColumns */);
mTooltipFormText = createFormText(table, toolkit, true, "<form></form>",
false /* setupLayoutData */);
updateTooltip();
mCheckbox = toolkit.createButton(table,
"Define an <application> tag in the AndroidManifest.xml",
SWT.CHECK);
mCheckbox.setLayoutData(new TableWrapData(TableWrapData.FILL_GRAB, TableWrapData.TOP));
mCheckbox.setSelection(false);
mCheckbox.addSelectionListener(new CheckboxSelectionListener());
mAppNodeUpdateListener = new AppNodeUpdateListener();
getUiElementNode().addUpdateListener(mAppNodeUpdateListener);
// Initialize the state of the checkbox
mAppNodeUpdateListener.uiElementNodeUpdated(getUiElementNode(),
UiUpdateState.CHILDREN_CHANGED);
// Tell the section that the layout has changed.
layoutChanged();
}
/**
* Updates the application tooltip in the form text.
* If there is no tooltip, the form text is hidden.
*/
private void updateTooltip() {
boolean isVisible = false;
String tooltip = getUiElementNode().getDescriptor().getTooltip();
if (tooltip != null) {
tooltip = DescriptorsUtils.formatFormText(tooltip,
getUiElementNode().getDescriptor(),
Sdk.getCurrent().getDocumentationBaseUrl());
mTooltipFormText.setText(tooltip, true /* parseTags */, true /* expandURLs */);
mTooltipFormText.setImage(DescriptorsUtils.IMAGE_KEY, AdtPlugin.getAndroidLogo());
mTooltipFormText.addHyperlinkListener(getEditor().createHyperlinkListener());
isVisible = true;
}
mTooltipFormText.setVisible(isVisible);
}
/**
* This listener synchronizes the XML application node when the checkbox
* is changed by the user.
*/
private class CheckboxSelectionListener extends SelectionAdapter {
private Node mUndoXmlNode;
private Node mUndoXmlParent;
private Node mUndoXmlNextNode;
private Node mUndoXmlNextElement;
private Document mUndoXmlDocument;
@Override
public void widgetSelected(SelectionEvent e) {
super.widgetSelected(e);
if (!mInternalModification && getUiElementNode() != null) {
getUiElementNode().getEditor().wrapUndoRecording(
mCheckbox.getSelection()
? "Create or restore Application node"
: "Remove Application node",
new Runnable() {
public void run() {
getUiElementNode().getEditor().editXmlModel(new Runnable() {
public void run() {
if (mCheckbox.getSelection()) {
// The user wants an <application> node.
// Either restore a previous one
// or create a full new one.
boolean create = true;
if (mUndoXmlNode != null) {
create = !restoreApplicationNode();
}
if (create) {
getUiElementNode().createXmlNode();
}
} else {
// Users no longer wants the <application> node.
removeApplicationNode();
}
}
});
}
});
}
}
/**
* Restore a previously "saved" application node.
*
* @return True if the node could be restored, false otherwise.
*/
private boolean restoreApplicationNode() {
if (mUndoXmlDocument == null || mUndoXmlNode == null) {
return false;
}
// Validate node references...
mUndoXmlParent = validateNode(mUndoXmlDocument, mUndoXmlParent);
mUndoXmlNextNode = validateNode(mUndoXmlDocument, mUndoXmlNextNode);
mUndoXmlNextElement = validateNode(mUndoXmlDocument, mUndoXmlNextElement);
if (mUndoXmlParent == null){
// If the parent node doesn't exist, try to find a new manifest node.
// If it doesn't exist, create it.
mUndoXmlParent = getUiElementNode().getUiParent().prepareCommit();
mUndoXmlNextNode = null;
mUndoXmlNextElement = null;
}
boolean success = false;
if (mUndoXmlParent != null) {
// If the parent is still around, reuse the same node.
// Ideally we want to insert the node before what used to be its next sibling.
// If that's not possible, we try to insert it before its next sibling element.
// If that's not possible either, it will be inserted at the end of the parent's.
Node next = mUndoXmlNextNode;
if (next == null) {
next = mUndoXmlNextElement;
}
mUndoXmlParent.insertBefore(mUndoXmlNode, next);
if (next == null) {
Text sep = mUndoXmlDocument.createTextNode("\n"); //$NON-NLS-1$
mUndoXmlParent.insertBefore(sep, null); // insert separator before end tag
}
success = true;
}
// Remove internal references to avoid using them twice
mUndoXmlParent = null;
mUndoXmlNextNode = null;
mUndoXmlNextElement = null;
mUndoXmlNode = null;
mUndoXmlDocument = null;
return success;
}
/**
* Validates that the given xml_node is still either the root node or one of its
* direct descendants.
*
* @param root_node The root of the node hierarchy to examine.
* @param xml_node The XML node to find.
* @return Returns xml_node if it is, otherwise returns null.
*/
private Node validateNode(Node root_node, Node xml_node) {
if (root_node == xml_node) {
return xml_node;
} else {
for (Node node = root_node.getFirstChild(); node != null;
node = node.getNextSibling()) {
if (root_node == xml_node || validateNode(node, xml_node) != null) {
return xml_node;
}
}
}
return null;
}
/**
* Removes the <application> node from the hierarchy.
* Before doing that, we try to remember where it was so that we can put it back
* in the same place.
*/
private void removeApplicationNode() {
// Make sure the node actually exists...
Node xml_node = getUiElementNode().getXmlNode();
if (xml_node == null) {
return;
}
// Save its parent, next sibling and next element
mUndoXmlDocument = xml_node.getOwnerDocument();
mUndoXmlParent = xml_node.getParentNode();
mUndoXmlNextNode = xml_node.getNextSibling();
mUndoXmlNextElement = mUndoXmlNextNode;
while (mUndoXmlNextElement != null &&
mUndoXmlNextElement.getNodeType() != Node.ELEMENT_NODE) {
mUndoXmlNextElement = mUndoXmlNextElement.getNextSibling();
}
// Actually remove the node from the hierarchy and keep it here.
// The returned node looses its parents/siblings pointers.
mUndoXmlNode = getUiElementNode().deleteXmlNode();
}
}
/**
* This listener synchronizes the UI (i.e. the checkbox) with the
* actual presence of the application XML node.
*/
private class AppNodeUpdateListener implements IUiUpdateListener {
public void uiElementNodeUpdated(UiElementNode ui_node, UiUpdateState state) {
// The UiElementNode for the application XML node always exists, even
// if there is no corresponding XML node in the XML file.
//
// To update the checkbox to reflect the actual state, we just need
// to check if the XML node is null.
try {
mInternalModification = true;
boolean exists = ui_node.getXmlNode() != null;
if (mCheckbox.getSelection() != exists) {
mCheckbox.setSelection(exists);
}
} finally {
mInternalModification = false;
}
}
}
}
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