3

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

在此处输入图像描述

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？

4

1 回答 1

0

是的，您可以这样做，但就像您完全自定义绘制表格一样，您还必须管理滚动效果。您可以向滚动条添加侦听器，并使用 侦听用户对滚动位置所做的任何更改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，以确保获得真实的体验。

于 2013-02-28T12:15:56.483 回答