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/*******************************************************************************
* Copyright (c) 2009, 2012 Wind River Systems 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:
* Wind River Systems - initial API and implementation
* IBM Corporation - ongoing bug fixes and enhancements
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.breadcrumb;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.internal.core.IInternalDebugCoreConstants;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.jface.util.OpenStrategy;
import org.eclipse.jface.viewers.IOpenListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.jface.viewers.ITreeViewerListener;
import org.eclipse.jface.viewers.OpenEvent;
import org.eclipse.jface.viewers.TreeExpansionEvent;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.ui.progress.UIJob;
/**
* A breadcrumb drop-down which shows a tree viewer. It implements mouse and
* key listeners to handle selection and expansion behavior of the viewer.
* This class needs to be extended to implement
* {@link #createTreeViewer(Composite, int, TreePath)} to instantiate the
* concrete {@link TreeViewer} object.
*
* @since 3.5
*/
public abstract class TreeViewerDropDown {
/**
* Delay to control scrolling when the mouse pointer reaches the edge of
* the tree viewer.
*/
private static long MOUSE_MOVE_SCROLL_DELAY = 500;
/**
* The breadcrumb site in which the viewer is created.
*/
private IBreadcrumbDropDownSite fDropDownSite;
/**
* The tree viewer.
*/
private TreeViewer fDropDownViewer;
/**
* Creates the viewer and installs the listeners.
*
* @param composite Parent control of the viewer.
* @param site Breadcrumb site for the viewer.
* @param path Path to the element for which the drop-down is being opened.
* @return The control created for the viewer.
*/
public Control createDropDown(Composite composite, IBreadcrumbDropDownSite site, TreePath path) {
fDropDownSite = site;
fDropDownViewer= createTreeViewer(composite, SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL, path);
fDropDownViewer.addOpenListener(new IOpenListener() {
public void open(OpenEvent event) {
if (DebugUIPlugin.DEBUG_TREE_VIEWER_DROPDOWN) {
DebugUIPlugin.trace("BreadcrumbItemDropDown.showMenu()$treeViewer>open"); //$NON-NLS-1$
}
openElement(event.getSelection());
}
});
final Tree tree = fDropDownViewer.getTree();
tree.addMouseListener(new MouseListener() {
public void mouseUp(MouseEvent e) {
if (DebugUIPlugin.DEBUG_TREE_VIEWER_DROPDOWN) {
DebugUIPlugin.trace("BreadcrumbItemDropDown.showMenu()$treeViewer>mouseUp"); //$NON-NLS-1$
}
if (e.button != 1)
return;
if ((OpenStrategy.getOpenMethod() & OpenStrategy.SINGLE_CLICK) != 0)
return;
TreeItem item= tree.getItem(new Point(e.x, e.y));
if (item == null)
return;
List pathElements = new LinkedList();
while(item != null) {
Object data = item.getData();
if (data == null) return;
pathElements.add(0, data);
item = item.getParentItem();
}
openElement(new TreeSelection(new TreePath(pathElements.toArray())));
}
public void mouseDown(MouseEvent e) {
}
public void mouseDoubleClick(MouseEvent e) {
}
});
tree.addMouseMoveListener(new MouseMoveListener() {
TreeItem fLastItem= null;
long fLastScrollTime = 0;
public void mouseMove(MouseEvent e) {
if (tree.equals(e.getSource())) {
Object o= tree.getItem(new Point(e.x, e.y));
if (fLastItem == null ^ o == null) {
tree.setCursor(o == null ? null : tree.getDisplay()
.getSystemCursor(SWT.CURSOR_HAND));
}
if (o instanceof TreeItem) {
TreeItem currentItem= (TreeItem) o;
if (!o.equals(fLastItem)) {
fLastItem= (TreeItem) o;
tree.setSelection(new TreeItem[] { fLastItem });
} else if (System.currentTimeMillis() > (fLastScrollTime + MOUSE_MOVE_SCROLL_DELAY)) {
if (e.y < tree.getItemHeight() / 4)
{
// Scroll up
if (currentItem.getParentItem() == null) {
int index= tree.indexOf((TreeItem) o);
if (index < 1)
return;
fLastItem= tree.getItem(index - 1);
tree.setSelection(new TreeItem[] { fLastItem });
} else {
Point p= tree.toDisplay(e.x, e.y);
Item item= fDropDownViewer.scrollUp(p.x, p.y);
fLastScrollTime = System.currentTimeMillis();
if (item instanceof TreeItem) {
fLastItem= (TreeItem) item;
tree.setSelection(new TreeItem[] { fLastItem });
}
}
} else if (e.y > tree.getBounds().height - tree.getItemHeight() / 4) {
// Scroll down
if (currentItem.getParentItem() == null) {
int index= tree.indexOf((TreeItem) o);
if (index >= tree.getItemCount() - 1)
return;
fLastItem= tree.getItem(index + 1);
tree.setSelection(new TreeItem[] { fLastItem });
} else {
Point p= tree.toDisplay(e.x, e.y);
Item item= fDropDownViewer.scrollDown(p.x, p.y);
fLastScrollTime = System.currentTimeMillis();
if (item instanceof TreeItem) {
fLastItem= (TreeItem) item;
tree.setSelection(new TreeItem[] { fLastItem });
}
}
}
}
} else if (o == null) {
fLastItem = null;
}
}
}
});
tree.addKeyListener(new KeyListener() {
public void keyPressed(KeyEvent e) {
if (e.keyCode == SWT.ARROW_UP) {
// No elements in the tree (bug 262961).
if (tree.getItemCount() == 0) {
fDropDownSite.close();
return;
}
TreeItem[] selection= tree.getSelection();
if (selection.length != 1)
return;
int selectionIndex= tree.indexOf(selection[0]);
if (selectionIndex != 0)
return;
fDropDownSite.close();
}
}
public void keyReleased(KeyEvent e) {
}
});
fDropDownViewer.addTreeListener(new ITreeViewerListener() {
public void treeCollapsed(TreeExpansionEvent event) {
}
public void treeExpanded(TreeExpansionEvent event) {
tree.setRedraw(false);
new UIJob(tree.getDisplay(), IInternalDebugCoreConstants.EMPTY_STRING) {
{ setSystem(true); }
public IStatus runInUIThread(IProgressMonitor monitor) {
if (!tree.isDisposed()) {
try {
fDropDownSite.updateSize();
} finally {
tree.setRedraw(true);
}
}
return Status.OK_STATUS;
}
}.schedule();
}
});
return tree;
}
/**
* Creates and returns the tree viewer.
*
* @param composite Parent control of the viewer.
* @param style Style flags to use in creating the tree viewer.
* @param path Path to the element for which the drop-down is being opened.
* @return The newly created tree viewer.
*/
protected abstract TreeViewer createTreeViewer(Composite composite, int style, TreePath path);
/**
* Called when the given element was selected in the viewer. It causes the
* breadcrumb viewer to fire an opened event. If the viewer loses focus
* as a result of the open operation, then the drop-down is closed.
* Otherwise the selected element is expanded.
*
* @param selection The selection to open.
*/
protected void openElement(ISelection selection) {
if (selection == null || !(selection instanceof ITreeSelection) || selection.isEmpty())
return;
// This might or might not open an editor
fDropDownSite.notifySelection(selection);
Tree tree = fDropDownViewer.getTree();
boolean treeHasFocus= !tree.isDisposed() && tree.isFocusControl();
if (DebugUIPlugin.DEBUG_TREE_VIEWER_DROPDOWN) {
DebugUIPlugin.trace(" isDisposed: " + tree.isDisposed()); //$NON-NLS-1$
DebugUIPlugin.trace(" shell hasFocus: " + (!tree.isDisposed() && tree.isFocusControl())); //$NON-NLS-1$
DebugUIPlugin.trace(" tree hasFocus: " + treeHasFocus); //$NON-NLS-1$
}
if (tree.isDisposed())
return;
if (!treeHasFocus) {
fDropDownSite.close();
return;
}
toggleExpansionState( ((ITreeSelection)selection).getPaths()[0]);
}
private void toggleExpansionState(TreePath path) {
Tree tree= fDropDownViewer.getTree();
if (fDropDownViewer.getExpandedState(path))
fDropDownViewer.collapseToLevel(path, 1);
else {
tree.setRedraw(false);
try {
fDropDownViewer.expandToLevel(path, 1);
fDropDownSite.updateSize();
} finally {
tree.setRedraw(true);
}
}
}
}
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