英文:
SWT Issue in Aligning + Filling a Label with GridData
问题
所以，我尝试制作了一个小游戏，在游戏中你必须执行标签显示的动作。
我的问题是，我无法将标签与列的中心对齐，并且**同时**填充整个列的空间以便我可以使用背景颜色。
例如：
```java
Shell shell = new Shell(display);
GridLayout layout = new GridLayout();
Font font = new Font(display, "Arial", 30, SWT.NONE);
layout.numColumns = 2;
layout.marginHeight = 0;
layout.marginWidth = 0;
shell.setText("ReactionGame 2.0");
shell.setMaximized(true);
shell.setLayout(layout);
shell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
GridData data1 = new GridData(SWT.CENTER, SWT.CENTER, true, true);
data1.verticalAlignment = GridData.FILL;
data1.horizontalAlignment = GridData.FILL;
Label lifelabel = new Label(shell, SWT.NONE);
lifes(lifelabel);
lifelabel.setForeground(display.getSystemColor(SWT.COLOR_RED));
lifelabel.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
lifelabel.setFont(font);
lifelabel.setLayoutData(data1);
Label scorelabel = new Label(shell, SWT.NONE);
scorecount(scorelabel);
scorelabel.setForeground(display.getSystemColor(SWT.COLOR_RED));
scorelabel.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
scorelabel.setFont(font);
scorelabel.setLayoutData(data1);
Label gamelabel = new Label(shell, SWT.NONE);
gamelabel.setText("");
gamelabel.setForeground(display.getSystemColor(SWT.COLOR_GREEN));
gamelabel.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
gamelabel.setFont(font);
gamelabel.setLayoutData(data1);
我的问题是，我如何使标签的文本居中对齐？
<details>
<summary>英文:</summary>
So, I tried to make a little game where you have to do actions that are displayed by a label.
My problem is that I can't align the label in the center of a column **AND** fill the whole space of the column with the label so I can use the background cColor.
For example:
Shell shell = new Shell(display);
GridLayout layout = new GridLayout();
Font font = new Font(display, "Arial", 30, SWT.NONE);
layout.numColumns = 2;
layout.marginHeight = 0;
layout.marginWidth = 0;
shell.setText("ReactionGame 2.0");
shell.setMaximized(true);
shell.setLayout(layout);
shell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
GridData data1 = new GridData(SWT.CENTER, SWT.CENTER, true, true);
data1.verticalAlignment = GridData.FILL;
data1.horizontalAlignment = GridData.FILL;
Label lifelabel = new Label(shell, SWT.NONE);
lifes(lifelabel);
lifelabel.setForeground(display.getSystemColor(SWT.COLOR_RED));
lifelabel.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
lifelabel.setFont(font);
lifelabel.setLayoutData(data1);
Label scorelabel = new Label(shell, SWT.NONE);
scorecount(scorelabel);
scorelabel.setForeground(display.getSystemColor(SWT.COLOR_RED));
scorelabel.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
scorelabel.setFont(font);
scorelabel.setLayoutData(data1);
Label gamelabel = new Label(shell, SWT.NONE);
gamelabel.setText("");
gamelabel.setForeground(display.getSystemColor(SWT.COLOR_GREEN));
gamelabel.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
gamelabel.setFont(font);
gamelabel.setLayoutData(data1);
[This code gives me a design of this:][1]
[1]: https://i.stack.imgur.com/HBMeF.png
My question now is how can I align the text of the label in the center?
</details>
# 答案1
**得分**: 2
您正在多个控件上重用同一个`GridData`（`data1`），这是不允许的。`GridData`实例用于保存有关各个控件的布局信息，您必须为每个控件使用一个新实例。
因此，请使用：
```java
lifelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
scorelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
gamelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
要创建第三个区域，您需要使用一个额外的带有标签居中且设置了背景颜色的Composite：
Composite gameComp = new Composite(shell, SWT.NONE);
gameComp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
gameComp.setBackground(display.getSystemColor(SWT.COLOR_RED));
GridLayout gameLayout = new GridLayout();
gameLayout.marginHeight = 0;
gameLayout.marginWidth = 0;
gameComp.setLayout(gameLayout);
Label gamelabel = new Label(gameComp, SWT.NONE);
gamelabel.setText("game");
gamelabel.setForeground(display.getSystemColor(SWT.COLOR_GREEN));
gamelabel.setBackground(display.getSystemColor(SWT.COLOR_RED));
gamelabel.setFont(font);
gamelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
英文:
You are reusing the same GridData (data1) for multiple controls - this is not allowed. The GridData instance is used to save layout information about individual controls, you must use a new instance for each control.
So use:
lifelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
scorelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
gamelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
To make the third area you will need to use an extra Composite with the label centred in that and a background colour set:
Composite gameComp = new Composite(shell, SWT.NONE);
gameComp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
gameComp.setBackground(display.getSystemColor(SWT.COLOR_RED));
GridLayout gameLayout = new GridLayout();
gameLayout.marginHeight = 0;
gameLayout.marginWidth = 0;
gameComp.setLayout(gameLayout);
Label gamelabel = new Label(gameComp, SWT.NONE);
gamelabel.setText("game");
gamelabel.setForeground(display.getSystemColor(SWT.COLOR_GREEN));
gamelabel.setBackground(display.getSystemColor(SWT.COLOR_RED));
gamelabel.setFont(font);
gamelabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true));
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论