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/*******************************************************************************
* Copyright (c) 2011, 2012 Mentor Graphics 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:
* Vladimir Prus (Mentor Graphics) - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.dsf.gdb.internal.ui.osview;
import org.eclipse.cdt.dsf.gdb.internal.ui.GdbUIPlugin;
import org.eclipse.cdt.dsf.gdb.service.IGDBHardwareAndOS2.IResourceClass;
import org.eclipse.jface.action.ContributionItem;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
/**
* @since 2.4
*/
public class ResourceClassContributionItem extends ContributionItem {
// In some places below, we are trying to determine size hint for Combo, given the list of
// content. However, while we can determine width of content, we don't know how much width
// the combobox itself is adding. This constant is our guess.
private static final int COMBO_TRIM_WIDTH = 64;
interface Listener
{
void resourceClassChanged(String newClass);
}
private Combo fResourceClassCombo;
private IResourceClass[] resourceClasses = new IResourceClass[0];
private String fResourceClassId = null;
private Listener fListener;
private boolean blockListener = false;
private ToolItem toolItem;
private boolean enabled = true;
private static IDialogSettings settings;
private static IDialogSettings getDialogSettings()
{
if (settings != null)
return settings;
IDialogSettings topSettings = GdbUIPlugin.getDefault().getDialogSettings();
settings = topSettings.getSection(ResourceClassContributionItem.class.getName());
if (settings == null) {
settings = topSettings.addNewSection(ResourceClassContributionItem.class.getName());
}
return settings;
}
public void setListener(Listener listener) {
fListener = listener;
}
public void setEnabled(boolean enable) {
// It appears that every update of action bars will call 'fill' action below, creating
// combo. So, we want to keep 'enabled' state as member variable, to make sure it is kept
// if combo is recreated.
enabled = enable;
if (fResourceClassCombo != null)
fResourceClassCombo.setEnabled(enable);
}
public String updateClasses(IResourceClass[] resourceClasses) {
boolean different = false;
if (this.resourceClasses.length != resourceClasses.length)
different = true;
else for (int i = 0; i < this.resourceClasses.length; ++i) {
if (!this.resourceClasses[i].getId().equals(resourceClasses[i].getId())
|| !this.resourceClasses[i].getHumanDescription().equals(resourceClasses[i].getHumanDescription()))
{
different = true;
break;
}
}
if (!different)
return fResourceClassId;
this.resourceClasses = resourceClasses;
fResourceClassCombo.removeAll();
final int width = populateCombo();
// Now change the width. Call to setWidth causes relayout automatically.
// IMPORTANT: the visibility check is critical. Without it, we appear to have hit
// an SWT/Gtk bug whenever a debug session and a previously use OS resources view
// is not shown. The bug manifests by 100% CPU consumption inside event loop, and
// it further blocks asyncExec runnables from ever executing. I suppose it might
// be specific to relayout of invisible toolbar.
// If we're invisible, we don't arrange for relayout to happen when the view becomes
// available, because it is not exactly trivial (we need to events on the right control)
// and it only matters when we start a new session and it has a different set of
// resource classes and that requires longer combobox.
if (toolItem.getParent().isVisible())
toolItem.setWidth(width);
return fResourceClassId;
}
/** Populate the combobox with resource classes. Return the width the
* combobox must have, including any trim. If there are no resource classes,
* returns some reasonable default width.
*/
private int populateCombo() {
int width = 0;
String lastResourceClassId = getDialogSettings().get("resourceClass"); //$NON-NLS-1$
int index = -1;
int i = 0;
GC gc = new GC(fResourceClassCombo);
for (i = 0; i < resourceClasses.length; ++i) {
String description = resourceClasses[i].getHumanDescription();
width = Math.max(width, gc.textExtent(description).x);
fResourceClassCombo.add(description);
if (resourceClasses[i].getId().equals(lastResourceClassId))
index = i;
}
if (index != -1) {
fResourceClassId = lastResourceClassId;
blockListener = true;
fResourceClassCombo.select(index);
blockListener = false;
}
if (width == 0) {
// We have some hints what the longest element in combo will be. Even if it's different
// in new GDB version, no problem -- the combo will be resized when it's populated.
width = gc.textExtent("Shared memory regions").x; //$NON-NLS-1$
}
// Because there's no way whatsoever to set the width
// of the combobox list, only complete length, we just add
// random padding.
width = width + COMBO_TRIM_WIDTH;
return width;
}
public String getResourceClassId() {
return fResourceClassId;
}
@Override
public void fill(ToolBar parent, int toolbarItemIndex) {
fResourceClassCombo = new Combo(parent, SWT.NONE);
fResourceClassCombo.setEnabled(enabled);
int width = populateCombo();
fResourceClassCombo.addSelectionListener(new SelectionListener() {
@SuppressWarnings({ "null"})
@Override
public void widgetSelected(SelectionEvent e) {
String description = fResourceClassCombo.getText();
String id = null;
for (int i = 0; i < resourceClasses.length; ++i)
if (resourceClasses[i].getHumanDescription().equals(description)) {
id = resourceClasses[i].getId();
break;
}
// id is never null here, unless we messed up our data structures.
assert id != null;
if (id != null && !id.equals(fResourceClassId))
{
fResourceClassId = id;
getDialogSettings().put("resourceClass", id); //$NON-NLS-1$
if (fListener != null && !blockListener)
fListener.resourceClassChanged(fResourceClassId);
}
}
@Override
public void widgetDefaultSelected(SelectionEvent e) {
}
});
toolItem = new ToolItem(parent, SWT.SEPARATOR);
toolItem.setControl(fResourceClassCombo);
toolItem.setWidth(width);
}
@Override
public boolean isDynamic() {
return false;
}
}
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