【Java开源代码栏目提醒】:网学会员为广大网友收集整理了,Canvas2.java,希望对大家有所帮助!
package cn.com.chengang.swt;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Canvas2 {
private static Image image;
public static void main(String[] args) {
final Display display = Display.getDefault();
final Shell shell = new Shell();
shell.setSize(327, 253);
// ---------创建窗口中的其他界面组件-------------
shell.setLayout(new RowLayout());
// SWT.H_SCROLL|SWT.V_SCROLL式样可在画布上显示滚动条
final Canvas canvas = new Canvas(shell, SWT.BORDER);
// 监听canvas的重绘事件
canvas.addPaintListener(new PaintListener() {
public void paintControl(final PaintEvent event) {
// 将图像显示在canvas上,(10,10)定位图像左上角距canvas左上角的距离
if (image != null) {
event.gc.drawImage(image, 10, 10);
}
}
});
final Image refreshImage = new Image(display, "icons/refresh.gif");
final Image nextImage = new Image(display, "icons/next.gif");
Button button1 = new Button(shell, SWT.NONE);
button1.setText("图片1");
button1.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
image = refreshImage;
canvas.redraw();
}
});
Button button2 = new Button(shell, SWT.NONE);
button2.setText("图片2");
button2.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
image = nextImage;
canvas.redraw();
}
});
Button clearButton = new Button(shell, SWT.NONE);
clearButton.setText("清除图像");
clearButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
image = null;
canvas.redraw();
}
});
// -----------------END------------------------
shell.layout();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}