в 17:44, 31 мая 2010

2010-05-31T17:44:26Z

Admin: 1 версия

2010-05-31T15:21:29Z

1 версия

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== Get TreeItem from Mouse position in mouse down event ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeItemMousePostion {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI);
for (int i = 0; i < 12; i++) {
TreeItem treeItem = new TreeItem(tree, SWT.NONE);
treeItem.setText("Item " + i);
}
tree.addListener(SWT.MouseDown, new Listener() {
public void handleEvent(Event event) {
Point point = new Point(event.x, event.y);
TreeItem item = tree.getItem(point);
if (item != null) {
System.out.println("Mouse down: " + item);
}
}
});
tree.setSize(200, 200);
shell.setSize(300, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Limit selection to items that match a pattern ==



<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2004 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.swt.snippets;
/*
* Tree example snippet: limit selection to items that match a pattern
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeSelectionPattern {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI);
for (int i = 0; i < 2; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("item " + i);
for (int j = 0; j < 2; j++) {
TreeItem subItem = new TreeItem(item, SWT.NONE);
subItem.setText("item " + j);
for (int k = 0; k < 2; k++) {
TreeItem subsubItem = new TreeItem(subItem, SWT.NONE);
subsubItem.setText("item " + k);
}
}
}
tree.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
TreeItem[] selection = tree.getSelection();
TreeItem[] revisedSelection = new TreeItem[0];
for (int i = 0; i < selection.length; i++) {
String text = selection[i].getText();
if (text.indexOf("1") > 0) {
TreeItem[] newSelection = new TreeItem[revisedSelection.length + 1];
System.arraycopy(revisedSelection, 0, newSelection, 0, revisedSelection.length);
newSelection[revisedSelection.length] = selection[i];
revisedSelection = newSelection;
}
}
tree.setSelection(revisedSelection);
}
});
shell.setSize(300, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Tree default selection listener ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeNodeDefaultSelectionListener {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
for (int i = 0; i < 4; i++) {
TreeItem item0 = new TreeItem(tree, 0);
item0.setText("Item " + i);
for (int j = 0; j < 4; j++) {
TreeItem item1 = new TreeItem(item0, 0);
item1.setText("SubItem " + i + " " + j);
for (int k = 0; k < 4; k++) {
TreeItem item2 = new TreeItem(item1, 0);
item2.setText("SubItem " + i + " " + j + " " + k);
}
}
}
tree.addListener(SWT.DefaultSelection, new Listener() {
public void handleEvent(Event e) {
String string = "";
TreeItem[] selection = tree.getSelection();
for (int i = 0; i < selection.length; i++)
string += selection[i] + " ";
System.out.println("DefaultSelection={" + string + "}");
}
});
tree.getItems()[0].setExpanded(true);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Tree event: Measure TreeItem, Paint TreeItem and Erase TreeItem ==



<source lang="java">
/*******************************************************************************
* 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.swt.snippets;
/*
* Tree example snippet: Images on the right side of the TreeItem
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeColumn;
import org.eclipse.swt.widgets.TreeItem;
public class TreeEventMeasurePaintErase {
public static void main(String[] args) {
Display display = new Display();
final Image image = display.getSystemImage(SWT.ICON_INFORMATION);
Shell shell = new Shell(display);
shell.setText("Images on the right side of the TreeItem");
shell.setLayout(new FillLayout());
Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION);
tree.setHeaderVisible(true);
tree.setLinesVisible(true);
int columnCount = 4;
for (int i = 0; i < columnCount; i++) {
TreeColumn column = new TreeColumn(tree, SWT.NONE);
column.setText("Column " + i);
}
int itemCount = 3;
for (int i = 0; i < itemCount; i++) {
TreeItem item1 = new TreeItem(tree, SWT.NONE);
item1.setText("item " + i);
for (int c = 1; c < columnCount; c++) {
item1.setText(c, "item [" + i + "-" + c + "]");
}
for (int j = 0; j < itemCount; j++) {
TreeItem item2 = new TreeItem(item1, SWT.NONE);
item2.setText("item [" + i + " " + j + "]");
for (int c = 1; c < columnCount; c++) {
item2.setText(c, "item [" + i + " " + j + "-" + c + "]");
}
for (int k = 0; k < itemCount; k++) {
TreeItem item3 = new TreeItem(item2, SWT.NONE);
item3.setText("item [" + i + " " + j + " " + k + "]");
for (int c = 1; c < columnCount; c++) {
item3.setText(c, "item [" + i + " " + j + " " + k + "-" + c + "]");
}
}
}
}
/*
* NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
* Therefore, it is critical for performance that these methods be as
* efficient as possible.
*/
Listener paintListener = new Listener() {
public void handleEvent(Event event) {
switch (event.type) {
case SWT.MeasureItem: {
Rectangle rect = image.getBounds();
event.width += rect.width;
event.height = Math.max(event.height, rect.height + 2);
break;
}
case SWT.PaintItem: {
int x = event.x + event.width;
Rectangle rect = image.getBounds();
int offset = Math.max(0, (event.height - rect.height) / 2);
event.gc.drawImage(image, x, event.y + offset);
break;
}
}
}
};
tree.addListener(SWT.MeasureItem, paintListener);
tree.addListener(SWT.PaintItem, paintListener);
for (int i = 0; i < columnCount; i++) {
tree.getColumn(i).pack();
}
shell.setSize(500, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
if (image != null)
image.dispose();
display.dispose();
}
}</source>



== Tree Exapand listener ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeExpandListener {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
for (int i = 0; i < 4; i++) {
TreeItem item0 = new TreeItem(tree, 0);
item0.setText("Item " + i);
for (int j = 0; j < 4; j++) {
TreeItem item1 = new TreeItem(item0, 0);
item1.setText("SubItem " + i + " " + j);
for (int k = 0; k < 4; k++) {
TreeItem item2 = new TreeItem(item1, 0);
item2.setText("SubItem " + i + " " + j + " " + k);
}
}
}
tree.addListener(SWT.Expand, new Listener() {
public void handleEvent(Event e) {
System.out.println("Expand={" + e.item + "}");
}
});

tree.getItems()[0].setExpanded(true);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Tree node Collapse listener ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeNodeCollapseListener {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
for (int i = 0; i < 4; i++) {
TreeItem item0 = new TreeItem(tree, 0);
item0.setText("Item " + i);
for (int j = 0; j < 4; j++) {
TreeItem item1 = new TreeItem(item0, 0);
item1.setText("SubItem " + i + " " + j);
for (int k = 0; k < 4; k++) {
TreeItem item2 = new TreeItem(item1, 0);
item2.setText("SubItem " + i + " " + j + " " + k);
}
}
}
tree.addListener(SWT.Collapse, new Listener() {
public void handleEvent(Event e) {
System.out.println("Collapse={" + e.item + "}");
}
});

tree.getItems()[0].setExpanded(true);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Tree node selection event ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeNodeSelection {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
Tree tree = new Tree(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
for (int i = 0; i < 12; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("Item " + i);
for(int l = 0;l<12;l++){
TreeItem litem = new TreeItem(item, SWT.NONE);
litem.setText("Item " + i);
}

}
tree.setSize(100, 100);
tree.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
String string = event.detail == SWT.CHECK ? "Checked" : "Selected";
System.out.println(event.item + " " + string);
}
});
shell.setSize(200, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Tree node selection listener ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeNodeSelectionListener {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
for (int i = 0; i < 4; i++) {
TreeItem item0 = new TreeItem(tree, 0);
item0.setText("Item " + i);
for (int j = 0; j < 4; j++) {
TreeItem item1 = new TreeItem(item0, 0);
item1.setText("SubItem " + i + " " + j);
for (int k = 0; k < 4; k++) {
TreeItem item2 = new TreeItem(item1, 0);
item2.setText("SubItem " + i + " " + j + " " + k);
}
}
}
tree.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
String string = "";
TreeItem[] selection = tree.getSelection();
for (int i = 0; i < selection.length; i++)
string += selection[i] + " ";
System.out.println("Selection={" + string + "}");
}
});
tree.getItems()[0].setExpanded(true);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>

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