Java Tutorial/SWT/Sash
Содержание
Make Split Dragger slim
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Sash; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class SashSlimDragger {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Sash One");
shell.setLayout(new FormLayout());
Sash sash = new Sash(shell, SWT.VERTICAL);
FormData data = new FormData();
data.top = new FormAttachment(0, 0); // Attach to top
data.bottom = new FormAttachment(100, 0); // Attach to bottom
data.left = new FormAttachment(50, 0); // Attach halfway across
sash.setLayoutData(data);
Text one = new Text(shell, SWT.BORDER);
data = new FormData();
data.top = new FormAttachment(0, 0);
data.bottom = new FormAttachment(100, 0);
data.left = new FormAttachment(0, 0);
data.right = new FormAttachment(sash, 0);
one.setLayoutData(data);
Text two = new Text(shell, SWT.BORDER);
data = new FormData();
data.top = new FormAttachment(0, 0);
data.bottom = new FormAttachment(100, 0);
data.left = new FormAttachment(sash, 0);
data.right = new FormAttachment(100, 0);
two.setLayoutData(data);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Making a Sash Stick
- The default behavior of the sash allows dragging, but you must write code to make the sash stay.
- You implement an event handler to adjust the FormAttachment object associated with the sash"s movable direction.
- For a vertical sash, adjust the left FormAttachment.
- For a horizontal sash, adjust the top FormAttachment.
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Sash; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class SashFormSticker {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Sash One");
shell.setLayout(new FormLayout());
final Sash sash = new Sash(shell, SWT.VERTICAL);
FormData data = new FormData();
data.top = new FormAttachment(0, 0); // Attach to top
data.bottom = new FormAttachment(100, 0); // Attach to bottom
data.left = new FormAttachment(50, 0); // Attach halfway across
sash.setLayoutData(data);
Text one = new Text(shell, SWT.BORDER);
data = new FormData();
data.top = new FormAttachment(0, 0);
data.bottom = new FormAttachment(100, 0);
data.left = new FormAttachment(0, 0);
data.right = new FormAttachment(sash, 0);
one.setLayoutData(data);
Text two = new Text(shell, SWT.BORDER);
data = new FormData();
data.top = new FormAttachment(0, 0);
data.bottom = new FormAttachment(100, 0);
data.left = new FormAttachment(sash, 0);
data.right = new FormAttachment(100, 0);
two.setLayoutData(data);
sash.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
// Reattach to the left edge, and use the x value of the event to
// determine the offset from the left
((FormData) sash.getLayoutData()).left = new FormAttachment(0, event.x);
// Until the parent window does a layout, the sash will not be redrawn in
// its new location. So, force a layout.
sash.getParent().layout();
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Sashes
Sashes, also called splitters
- Sashes can be horizontal or vertical;
- The type is determined at construction time, and cannot be changed.
- The default is vertical.
- Passing SWT.HORIZONTAL or SWT.VERTICAL to the constructor determines the type:
<source lang="java">
Sash horizontalSash = new Sash(shell, SWT.HORIZONTAL); // Horizontal sash Sash verticalSash = new Sash(shell, SWT.VERTICAL); // Vertical sash</source>
Sash: implement a simple splitter (with a 20 pixel limit)
<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; /*
* Sash example snippet: implement a simple splitter (with a 20 pixel limit) * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Sash; import org.eclipse.swt.widgets.Shell; public class Splitter20PixelLimit {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
Button button1 = new Button(shell, SWT.PUSH);
button1.setText("Button 1");
final Sash sash = new Sash(shell, SWT.VERTICAL);
Button button2 = new Button(shell, SWT.PUSH);
button2.setText("Button 2");
final FormLayout form = new FormLayout();
shell.setLayout(form);
FormData button1Data = new FormData();
button1Data.left = new FormAttachment(0, 0);
button1Data.right = new FormAttachment(sash, 0);
button1Data.top = new FormAttachment(0, 0);
button1Data.bottom = new FormAttachment(100, 0);
button1.setLayoutData(button1Data);
final int limit = 20, percent = 50;
final FormData sashData = new FormData();
sashData.left = new FormAttachment(percent, 0);
sashData.top = new FormAttachment(0, 0);
sashData.bottom = new FormAttachment(100, 0);
sash.setLayoutData(sashData);
sash.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
Rectangle sashRect = sash.getBounds();
Rectangle shellRect = shell.getClientArea();
int right = shellRect.width - sashRect.width - limit;
e.x = Math.max(Math.min(e.x, right), limit);
if (e.x != sashRect.x) {
sashData.left = new FormAttachment(0, e.x);
shell.layout();
}
}
});
FormData button2Data = new FormData();
button2Data.left = new FormAttachment(sash, 0);
button2Data.right = new FormAttachment(100, 0);
button2Data.top = new FormAttachment(0, 0);
button2Data.bottom = new FormAttachment(100, 0);
button2.setLayoutData(button2Data);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
