滚动画布内容

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，即当用户单击向上/向下或向左箭头/向右箭头按钮时，单击并拖动拇指，单击拇指和向右箭头或向左箭头按钮之间的区域？

是的，您可以这样做，但正如您完全自定义绘制表格一样，您也必须管理滚动效果。您可以将侦听器添加到滚动条并侦听用户对滚动位置所做的任何更改，使用hBar.addSelectionListener()。您需要在滚动条（垂直和水平）上设置最小、最大、页面增量和拇指大小，以确保真实的体验。