如何将图像与表格单元格的中心对齐（SWT表） [英] How to align image to center of table cell (SWT Table)

问题描述

我开发了Eclipse RCP应用程序并遇到了表的问题。我们在数据库中有一些布尔格式的数据，用户希望使用复选框来查看该字段。

I develop Eclipse RCP application and got a problem with a Table. We have some data in database in boolean format and users wants to see that field using checkbox.

我试过使用 Button（SWT.CHECK）实现它作为表编辑器，但它工作得太慢了：（

I tried to implement it using Button(SWT.CHECK) as Table-Editor, but it worked too slow :(

我尝试使用2张图片 - 经过检查和取消选中的复选框，但是我无法将它们对齐到中心，它们会自动对齐。

I tried to use 2 images - checked and unchecked check-boxes, it works, but I can't align them to center, they are aligned to left automatically.

我甚至找到了如何捕获 SWT.MeasureItem 和 SWT.PaintItem 事件并手动处理它们更改 event.x 字段，但我遇到了问题 - 我目前无法获得什么列测量或绘画，因为事件不会向我提供该信息。

I even found how to catch SWT.MeasureItem and SWT.PaintItem events and process them manually by change event.x field, but I got a problem - I can't get what column measuring or painting at the moment, because Event doesn't provides me that information.

这是通过重绘时修改事件数据将图像对齐到中心的唯一方法，还是可以通过其他方式通过复选框表示布尔数据？我不知道现在需要编辑它们，所以只读模式就足够了。

Is it the only way to align images to center by modify event data on redrawing, or may be there is other ways to represent boolean data via check-boxes? I don't need to edit them now, so read-only mode should be enough.

推荐答案

您可以将 PaintListener 添加到您的表中以及何时绘制所选列（在我的情况下为第5列），检查行的大小和自己对齐图像..

You may add PaintListener to your table and when it will paint selected column (column 5 in my case), check the size of row and align the image by yourself..

testTable.addListener(SWT.PaintItem, new Listener() {

    @Override
    public void handleEvent(Event event) {
        // Am I on collumn I need..?
        if(event.index == 5) {
            Image tmpImage = IMAGE_TEST_PASS;
            int tmpWidth = 0;
            int tmpHeight = 0;
            int tmpX = 0;
            int tmpY = 0;

            tmpWidth = testTable.getColumn(event.index).getWidth();
            tmpHeight = ((TableItem)event.item).getBounds().height;

            tmpX = tmpImage.getBounds().width;
            tmpX = (tmpWidth / 2 - tmpX / 2);
            tmpY = tmpImage.getBounds().height;
            tmpY = (tmpHeight / 2 - tmpY / 2);
            if(tmpX <= 0) tmpX = event.x;
            else tmpX += event.x;
            if(tmpY <= 0) tmpY = event.y;
            else tmpY += event.y;
            event.gc.drawImage(tmpImage, tmpX, tmpY);
        }
    }
});

这篇关于如何将图像与表格单元格的中心对齐（SWT表）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！