Java Tutorial/SWT/ScrolledComposite
Содержание
- 1 Create a ScrolledComposite with wrapping content
- 2 Create the ScrolledComposite to scroll horizontally and vertically
- 3 Create two ScrolledComposites that scroll in tandem
- 4 If the window is too small, scrollbars will appear.
- 5 Scroll a widget into view on focus in
- 6 Scrollbars appear if the window is resized to be too small to show part of the button
- 7 Setting Minimum Size for a Child Control
- 8 Setting the Child Control"s Size
Create a ScrolledComposite with wrapping content
<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; /*
* Create a ScrolledComposite with wrapping content. * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ * * @since 3.0 */
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.events.ControlAdapter; import org.eclipse.swt.events.ControlEvent; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.RowLayout; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; public class ScrolledCompositeCreate {
public static void main(String[] args) {
Display display = new Display();
Image image1 = display.getSystemImage(SWT.ICON_WORKING);
Image image2 = display.getSystemImage(SWT.ICON_QUESTION);
Image image3 = display.getSystemImage(SWT.ICON_ERROR);
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final ScrolledComposite scrollComposite = new ScrolledComposite(shell, SWT.V_SCROLL
| SWT.BORDER);
final Composite parent = new Composite(scrollComposite, SWT.NONE);
for (int i = 0; i <= 50; i++) {
Label label = new Label(parent, SWT.NONE);
if (i % 3 == 0)
label.setImage(image1);
if (i % 3 == 1)
label.setImage(image2);
if (i % 3 == 2)
label.setImage(image3);
}
RowLayout layout = new RowLayout(SWT.HORIZONTAL);
layout.wrap = true;
parent.setLayout(layout);
scrollComposite.setContent(parent);
scrollComposite.setExpandVertical(true);
scrollComposite.setExpandHorizontal(true);
scrollComposite.addControlListener(new ControlAdapter() {
public void controlResized(ControlEvent e) {
Rectangle r = scrollComposite.getClientArea();
scrollComposite.setMinSize(parent.ruputeSize(r.width, SWT.DEFAULT));
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Create the ScrolledComposite to scroll horizontally and vertically
- SWT.H_SCROLL: horizontal scrolling.
- SWT.V_SCROLL: vertical scrolling.
- SWT.H_SCROLL | SWT.V_SCROLL: enable both.
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ScrollCompisiteHoriVertical {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("SashForm Test");
shell.setLayout(new FillLayout());
// Create the ScrolledComposite to scroll horizontally and vertically
ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
Composite child = new Composite(sc, SWT.NONE);
child.setLayout(new FillLayout());
new Button(child, SWT.PUSH).setText("One");
new Button(child, SWT.PUSH).setText("Two");
child.setSize(400, 400);
sc.setContent(child);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Create two ScrolledComposites that scroll in tandem
<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; /*
* Create two ScrolledComposites that scroll in tandem. * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.ScrollBar; import org.eclipse.swt.widgets.Shell; public class ScrolledCompositeInTandem {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final ScrolledComposite sc1 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
| SWT.V_SCROLL);
Button button1 = new Button(sc1, SWT.PUSH);
button1.setText("Button 1");
button1.setSize(400, 300);
sc1.setContent(button1);
final ScrolledComposite sc2 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
| SWT.V_SCROLL);
Button button2 = new Button(sc2, SWT.PUSH);
button2.setText("Button 2");
button2.setSize(300, 400);
sc2.setContent(button2);
final ScrollBar vBar1 = sc1.getVerticalBar();
final ScrollBar vBar2 = sc2.getVerticalBar();
final ScrollBar hBar1 = sc1.getHorizontalBar();
final ScrollBar hBar2 = sc2.getHorizontalBar();
SelectionListener listener1 = new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
int x = hBar1.getSelection() * (hBar2.getMaximum() - hBar2.getThumb())
/ Math.max(1, hBar1.getMaximum() - hBar1.getThumb());
int y = vBar1.getSelection() * (vBar2.getMaximum() - vBar2.getThumb())
/ Math.max(1, vBar1.getMaximum() - vBar1.getThumb());
sc2.setOrigin(x, y);
}
};
SelectionListener listener2 = new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
int x = hBar2.getSelection() * (hBar1.getMaximum() - hBar1.getThumb())
/ Math.max(1, hBar2.getMaximum() - hBar2.getThumb());
int y = vBar2.getSelection() * (vBar1.getMaximum() - vBar1.getThumb())
/ Math.max(1, vBar2.getMaximum() - vBar2.getThumb());
sc1.setOrigin(x, y);
}
};
vBar1.addSelectionListener(listener1);
hBar1.addSelectionListener(listener1);
vBar2.addSelectionListener(listener2);
hBar2.addSelectionListener(listener2);
shell.setSize(400, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
If the window is too small, scrollbars will appear.
<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; /*
* ScrolledComposite example snippet: scroll a control in a scrolled composite * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ScrollBarAuto {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
// this button has a minimum size of 400 x 400. If the window is resized to be big
// enough to show more than 400 x 400, the button will grow in size. If the window
// is made too small to show 400 x 400, scrollbars will appear.
ScrolledComposite c2 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
Button b2 = new Button(c2, SWT.PUSH);
b2.setText("expanding button");
c2.setContent(b2);
c2.setExpandHorizontal(true);
c2.setExpandVertical(true);
c2.setMinWidth(400);
c2.setMinHeight(400);
shell.setSize(600, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
Scroll a widget into view on focus in
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2005 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; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; /*
* Scroll a widget into view on focus in * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ * * @since 3.0 */
public class ScrollWidgetViewFocusIn {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
Button b1 = new Button(shell, SWT.PUSH);
b1.setText("top");
b1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
final ScrolledComposite sc = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
| SWT.V_SCROLL);
sc.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
Composite c = new Composite(sc, SWT.NONE);
c.setLayout(new GridLayout(10, true));
for (int i = 0; i < 300; i++) {
Button b = new Button(c, SWT.PUSH);
b.setText("Button " + i);
}
Button b2 = new Button(shell, SWT.PUSH);
b2.setText("bottom");
b2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
sc.setContent(c);
sc.setExpandHorizontal(true);
sc.setExpandVertical(true);
sc.setMinSize(c.ruputeSize(SWT.DEFAULT, SWT.DEFAULT));
Listener listener = new Listener() {
public void handleEvent(Event e) {
Control child = (Control) e.widget;
Rectangle bounds = child.getBounds();
Rectangle area = sc.getClientArea();
Point origin = sc.getOrigin();
if (origin.x > bounds.x)
origin.x = Math.max(0, bounds.x);
if (origin.y > bounds.y)
origin.y = Math.max(0, bounds.y);
if (origin.x + area.width < bounds.x + bounds.width)
origin.x = Math.max(0, bounds.x + bounds.width - area.width);
if (origin.y + area.height < bounds.y + bounds.height)
origin.y = Math.max(0, bounds.y + bounds.height - area.height);
sc.setOrigin(origin);
}
};
Control[] controls = c.getChildren();
for (int i = 0; i < controls.length; i++) {
controls[i].addListener(SWT.Activate, listener);
}
shell.setSize(300, 500);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
Scrollbars appear if the window is resized to be too small to show part of the button
<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; /*
* ScrolledComposite example snippet: scroll a control in a scrolled composite * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ScollCompositeControl {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
// this button is always 400 x 400. Scrollbars appear if the window is
// resized to be
// too small to show part of the button
ScrolledComposite c1 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
Button b1 = new Button(c1, SWT.PUSH);
b1.setText("fixed size button");
b1.setSize(400, 400);
c1.setContent(b1);
shell.setSize(600, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
Setting Minimum Size for a Child Control
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ScrolledCompositeMiniSize {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("SashForm Test");
shell.setLayout(new FillLayout());
// Create the ScrolledComposite to scroll horizontally and vertically
ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
Composite child = new Composite(sc, SWT.NONE);
child.setLayout(new FillLayout());
new Button(child, SWT.PUSH).setText("One");
new Button(child, SWT.PUSH).setText("Two");
sc.setMinSize(400, 400);
// Expand both horizontally and vertically
sc.setExpandHorizontal(true);
sc.setExpandVertical(true);
sc.setContent(child);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Setting the Child Control"s Size
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ScrolledCompositeChildSize {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("SashForm Test");
shell.setLayout(new FillLayout());
// Create the ScrolledComposite to scroll horizontally and vertically
ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
Composite child = new Composite(sc, SWT.NONE);
child.setLayout(new FillLayout());
new Button(child, SWT.PUSH).setText("One");
new Button(child, SWT.PUSH).setText("Two");
child.setSize(400, 400);
sc.setContent(child);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
