我在画布上绘制了一些文本和矩形。
package com.cavium.test.views;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ScrollBar;
import org.eclipse.swt.widgets.Shell;
public class Test2 {
protected static final int Y_STEP = 20;
static int shellStyle = SWT.NO_REDRAW_RESIZE | SWT.NO_BACKGROUND
| SWT.H_SCROLL | SWT.CLOSE | SWT.V_SCROLL | SWT.RESIZE;
static int canvasStyle = SWT.NO_REDRAW_RESIZE;// | SWT.H_SCROLL |
// SWT.V_SCROLL;
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display, shellStyle);
shell.setLayout(new FillLayout());
shell.setBackground(display.getSystemColor((SWT.COLOR_CYAN)));
shell.setText("Canvas Test");
shell.setSize(300, 200);
final Canvas canvas = new Canvas(shell, canvasStyle);
canvas.setLayout(new FillLayout());
canvas.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
final Point origin = new Point(10, 20);
final ScrollBar hBar = shell.getHorizontalBar();
Rectangle size = canvas.getBounds();
hBar.setMaximum(size.width);
hBar.setMinimum(0);
final ScrollBar vBar = shell.getVerticalBar();
hBar.setMaximum(size.height);
hBar.setMinimum(0);
// Create a paint handler for the canvas
canvas.addPaintListener(new PaintListener() {
@Override
public void paintControl(PaintEvent e) {
// Do some drawing
e.gc.drawString("Rows", origin.x, origin.y);
e.gc.drawString("Data", 120, 20);
for (int i = 0; i < 10; i++) {
e.gc.drawString("Row Header" + (i + 1), origin.x, origin.y
+ (i + 1) * Y_STEP);
for (int j = 0; j < 10; j++) {
e.gc.drawRectangle(origin.x + 110 + (j * 20), origin.y
+ (i + 1) * Y_STEP, 20, 20);
e.gc.drawString("C" + (j + 1), origin.x + 110 + 2
+ (j * 20), origin.y + (i + 1) * Y_STEP + 1);
}
}
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
是否可以在拖动水平滚动条时仅滚动单元格（C1、C2...），保持行标题 1、行标题 2 ...等保持不变。请参阅下面的快照
还让我知道我们如何检测滚动条上的鼠标事件，即当用户单击上/下或左箭头/右箭头按钮时，单击并拖动拇指，单击拇指和右箭头或左箭头按钮之间的区域？