/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.dialogs;
import java.util.ArrayList;
import java.util.Iterator;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.FilteredTree;
import org.eclipse.ui.dialogs.PatternFilter;
import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
import org.eclipse.ui.internal.WorkbenchMessages;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.registry.ViewRegistry;
import org.eclipse.ui.views.IViewCategory;
import org.eclipse.ui.views.IViewDescriptor;
import org.eclipse.ui.views.IViewRegistry;
/**
* The Show View dialog.
*/
public class ShowViewDialog extends Dialog implements
ISelectionChangedListener, IDoubleClickListener {
private static final String DIALOG_SETTING_SECTION_NAME = "ShowViewDialog"; //$NON-NLS-1$
private static final int LIST_HEIGHT = 300;
private static final int LIST_WIDTH = 250;
private static final String STORE_EXPANDED_CATEGORIES_ID = DIALOG_SETTING_SECTION_NAME
+ ".STORE_EXPANDED_CATEGORIES_ID"; //$NON-NLS-1$
private static final String STORE_SELECTED_VIEW_ID = DIALOG_SETTING_SECTION_NAME
+ ".STORE_SELECTED_VIEW_ID"; //$NON-NLS-1$
private FilteredTree filteredTree;
private Button okButton;
private IViewDescriptor[] viewDescs = new IViewDescriptor[0];
private IViewRegistry viewReg;
private IWorkbenchWindow window;
private Color dimmedForeground;
/**
* Constructs a new ShowViewDialog.
*
* @param window the workbench window
* @param viewReg the view registry
*/
public ShowViewDialog(IWorkbenchWindow window, IViewRegistry viewReg) {
super(window.getShell());
this.window = window;
this.viewReg = viewReg;
setShellStyle(getShellStyle() | SWT.RESIZE);
}
/**
* This method is called if a button has been pressed.
*/
protected void buttonPressed(int buttonId) {
if (buttonId == IDialogConstants.OK_ID) {
saveWidgetValues();
}
super.buttonPressed(buttonId);
}
/**
* Notifies that the cancel button of this dialog has been pressed.
*/
protected void cancelPressed() {
viewDescs = new IViewDescriptor[0];
super.cancelPressed();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell)
*/
protected void configureShell(Shell shell) {
super.configureShell(shell);
shell.setText(WorkbenchMessages.ShowView_shellTitle);
PlatformUI.getWorkbench().getHelpSystem().setHelp(shell,
IWorkbenchHelpContextIds.SHOW_VIEW_DIALOG);
}
/**
* Adds buttons to this dialog's button bar.
* <p>
* The default implementation of this framework method adds standard ok and
* cancel buttons using the <code>createButton</code> framework method.
* Subclasses may override.
* </p>
*
* @param parent the button bar composite
*/
protected void createButtonsForButtonBar(Composite parent) {
okButton = createButton(parent, IDialogConstants.OK_ID,
IDialogConstants.OK_LABEL, true);
createButton(parent, IDialogConstants.CANCEL_ID,
IDialogConstants.CANCEL_LABEL, false);
updateButtons();
}
/**
* Creates and returns the contents of the upper part of this dialog (above
* the button bar).
*
* @param parent the parent composite to contain the dialog area
* @return the dialog area control
*/
protected Control createDialogArea(Composite parent) {
// Run super.
Composite composite = (Composite) super.createDialogArea(parent);
composite.setFont(parent.getFont());
createFilteredTreeViewer(composite);
layoutTopControl(filteredTree);
// Restore the last state
restoreWidgetValues();
// Return results.
return composite;
}
/**
* Blends c1 and c2 based in the provided ratio.
*
* @param c1
* first color
* @param c2
* second color
* @param ratio
* percentage of the first color in the blend (0-100)
* @return the RGB value of the blended color
*
* copied from FormColors.java
*/
private static RGB blend(RGB c1, RGB c2, int ratio) {
int r = blend(c1.red, c2.red, ratio);
int g = blend(c1.green, c2.green, ratio);
int b = blend(c1.blue, c2.blue, ratio);
return new RGB(r, g, b);
}
private static int blend(int v1, int v2, int ratio) {
int b = (ratio * v1 + (100 - ratio) * v2) / 100;
return Math.min(255, b);
}
/**
* Create a new filtered tree viewer in the parent.
*
* @param parent the parent <code>Composite</code>.
*/
private void createFilteredTreeViewer(Composite parent) {
PatternFilter filter = new ViewPatternFilter();
int styleBits = SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER;
filteredTree = new FilteredTree(parent, styleBits, filter);
filteredTree.setBackground(parent.getDisplay().getSystemColor(
SWT.COLOR_WIDGET_BACKGROUND));
TreeViewer treeViewer = filteredTree.getViewer();
Control treeControl = treeViewer.getControl();
RGB dimmedRGB = blend(treeControl.getForeground().getRGB(), treeControl.getBackground().getRGB(), 60);
dimmedForeground = new Color(treeControl.getDisplay(), dimmedRGB);
treeControl.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
dimmedForeground.dispose();
}
});
treeViewer.setLabelProvider(new ViewLabelProvider(window, dimmedForeground));
treeViewer.setContentProvider(new ViewContentProvider());
treeViewer.setComparator(new ViewComparator((ViewRegistry) viewReg));
treeViewer.setInput(viewReg);
treeViewer.addSelectionChangedListener(this);
treeViewer.addDoubleClickListener(this);
treeViewer.addFilter(new CapabilityFilter());
// if the tree has only one or zero views, disable the filter text control
if (hasAtMostOneView(filteredTree.getViewer())) {
Text filterText = filteredTree.getFilterControl();
if (filterText != null) {
filterText.setEnabled(false);
}
}
applyDialogFont(filteredTree);
}
/**
* Return whether or not there are less than two views in the list.
*
* @param tree
* @return <code>true</code> if there are less than two views in the list.
*/
private boolean hasAtMostOneView(TreeViewer tree) {
ITreeContentProvider contentProvider = (ITreeContentProvider) tree
.getContentProvider();
Object[] children = contentProvider.getElements(tree.getInput());
if (children.length <= 1) {
if (children.length == 0) {
return true;
}
return !contentProvider.hasChildren(children[0]);
}
return false;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.viewers.IDoubleClickListener#doubleClick(org.eclipse.jface.viewers.DoubleClickEvent)
*/
public void doubleClick(DoubleClickEvent event) {
IStructuredSelection s = (IStructuredSelection) event.getSelection();
Object element = s.getFirstElement();
if (filteredTree.getViewer().isExpandable(element)) {
filteredTree.getViewer().setExpandedState(element, !filteredTree.getViewer().getExpandedState(element));
} else if (viewDescs.length > 0) {
saveWidgetValues();
setReturnCode(OK);
close();
}
}
/**
* Return the dialog store to cache values into
*/
protected IDialogSettings getDialogSettings() {
IDialogSettings workbenchSettings = WorkbenchPlugin.getDefault()
.getDialogSettings();
IDialogSettings section = workbenchSettings
.getSection(DIALOG_SETTING_SECTION_NAME);
if (section == null) {
section = workbenchSettings
.addNewSection(DIALOG_SETTING_SECTION_NAME);
}
return section;
}
/**
* Returns the descriptors for the selected views.
*
* @return the descriptors for the selected views
*/
public IViewDescriptor[] getSelection() {
return viewDescs;
}
/**
* Layout the top control.
*
* @param control the control.
*/
private void layoutTopControl(Control control) {
GridData spec = new GridData(GridData.FILL_BOTH);
spec.widthHint = LIST_WIDTH;
spec.heightHint = LIST_HEIGHT;
control.setLayoutData(spec);
}
/**
* Use the dialog store to restore widget values to the values that they
* held last time this dialog was used to completion.
*/
protected void restoreWidgetValues() {
IDialogSettings settings = getDialogSettings();
String[] expandedCategoryIds = settings
.getArray(STORE_EXPANDED_CATEGORIES_ID);
if (expandedCategoryIds == null) {
return;
}
ViewRegistry reg = (ViewRegistry) viewReg;
ArrayList categoriesToExpand = new ArrayList(expandedCategoryIds.length);
for (int i = 0; i < expandedCategoryIds.length; i++) {
IViewCategory category = reg.findCategory(expandedCategoryIds[i]);
if (category != null) {
categoriesToExpand.add(category);
}
}
if (!categoriesToExpand.isEmpty()) {
filteredTree.getViewer().setExpandedElements(categoriesToExpand.toArray());
}
String selectedViewId = settings.get(STORE_SELECTED_VIEW_ID);
if (selectedViewId != null) {
IViewDescriptor viewDesc = reg.find(selectedViewId);
if (viewDesc != null) {
filteredTree.getViewer().setSelection(new StructuredSelection(viewDesc), true);
}
}
}
/**
* Since OK was pressed, write widget values to the dialog store so that
* they will persist into the next invocation of this dialog
*/
protected void saveWidgetValues() {
IDialogSettings settings = getDialogSettings();
// Collect the ids of the all expanded categories
Object[] expandedElements = filteredTree.getViewer().getExpandedElements();
String[] expandedCategoryIds = new String[expandedElements.length];
for (int i = 0; i < expandedElements.length; ++i) {
expandedCategoryIds[i] = ((IViewCategory) expandedElements[i]).getId();
}
// Save them for next time.
settings.put(STORE_EXPANDED_CATEGORIES_ID, expandedCategoryIds);
String selectedViewId = ""; //$NON-NLS-1$
if (viewDescs.length > 0) {
// in the case of a multi-selection, it's probably less confusing
// to store just the first rather than the whole multi-selection
selectedViewId = viewDescs[0].getId();
}
settings.put(STORE_SELECTED_VIEW_ID, selectedViewId);
}
/**
* Notifies that the selection has changed.
*
* @param event event object describing the change
*/
public void selectionChanged(SelectionChangedEvent event) {
updateSelection(event);
updateButtons();
}
/**
* Update the button enablement state.
*/
protected void updateButtons() {
if (okButton != null) {
okButton.setEnabled(getSelection().length > 0);
}
}
/**
* Update the selection object.
*/
protected void updateSelection(SelectionChangedEvent event) {
ArrayList descs = new ArrayList();
IStructuredSelection sel = (IStructuredSelection) event.getSelection();
for (Iterator i = sel.iterator(); i.hasNext();) {
Object o = i.next();
if (o instanceof IViewDescriptor) {
descs.add(o);
}
}
viewDescs = new IViewDescriptor[descs.size()];
descs.toArray(viewDescs);
}
}