如何在 table 列和 table 单元格的右侧使用 java 中的 SWT 添加图像

Question

如何将图像添加到 table 列的右侧，同时将文本保留在左侧。下面是代码

TableColumn tc = new TableColumn(this.table_for_list, SWT.LEFT);
tc.setText("List");

for (int i = 0, n = this.table_for_list.getColumnCount(); i < n; i++) {
    this.table_for_list.getColumn(i).pack();
}        

TableItem item = new TableItem(this.table_for_list, SWT.NONE);
item.setText(0, "List 1");

TableItem item2 = new TableItem(this.table_for_list, SWT.NONE);
item2.setText(0, "List 2");

Table 列 Header 的左侧有 "List"，现在我想在另一端添加图像（table 的右侧）。我应该能够在 table 单元格右侧的每一行图像中添加。

Answer 1

我稍微修改了 this snippet 以使其按照您的要求执行：

public static void main(String[] args)
{
    Display display = new Display();
    final Image image = display.getSystemImage(SWT.ICON_INFORMATION);
    Shell shell = new Shell(display);
    shell.setText("Images on the right side of the TableItem");
    shell.setLayout(new FillLayout());
    Table table = new Table(shell, SWT.MULTI | SWT.FULL_SELECTION);
    table.setHeaderVisible(true);
    table.setLinesVisible(true);
    int columnCount = 3;
    for (int i = 0; i < columnCount; i++)
    {
        TableColumn column = new TableColumn(table, SWT.NONE);
        column.setText("Column " + i);
    }
    int itemCount = 8;
    for (int i = 0; i < itemCount; i++)
    {
        TableItem item = new TableItem(table, SWT.NONE);
    }
    /*
     * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
     * Therefore, it is critical for performance that these methods be
     * as efficient as possible.
     */
    Listener paintListener = event ->
    {
        switch (event.type)
        {
            case SWT.MeasureItem:
            {
                Rectangle rect1 = image.getBounds();
                event.width += rect1.width;
                event.height = Math.max(event.height, rect1.height + 2);
                break;
            }
            case SWT.PaintItem:
            {
                TableItem item = (TableItem) event.item;
                Rectangle rect2 = image.getBounds();
                Rectangle bounds = item.getBounds(event.index);
                int x = bounds.x + bounds.width - rect2.width;
                int offset = Math.max(0, (event.height - rect2.height) / 2);
                event.gc.drawImage(image, x, event.y + offset);
                break;
            }
        }
    };
    table.addListener(SWT.MeasureItem, paintListener);
    table.addListener(SWT.PaintItem, paintListener);

    for (int i = 0; i < columnCount; i++)
    {
        table.getColumn(i).pack();
    }
    shell.setSize(500, 200);
    shell.open();
    while (!shell.isDisposed())
    {
        if (!display.readAndDispatch()) display.sleep();
    }
    if (image != null) image.dispose();
    display.dispose();
}

看起来像这样：

如何在 table 列和 table 单元格的右侧使用 java 中的 SWT 添加图像

How to add image on the right side of the table column and table cell using SWT in java

java

swt

image

widget