如何将标签置于矩形图形的中心
我是draw2d的完全新手，我正在尝试制作一些示例以学习如何使用它...我正在尝试编写一个图，其中显示带有白色背景、一些填充和封闭的标签灰色背景。为此，我写了以下内容：
public class MyFigure extends Figure {
private Label label;
private RectangleFigure rectangle;
public MyFigure() {
rectangle = new RectangleFigure();
rectangle.setBackgroundColor(ColorConstants.gray);
label = new Label("Test label");
label.setFont(new Font(null, "Arial", 12, SWT.BOLD));
label.setTextAlignment(PositionConstants.CENTER);
label.setBackgroundColor(ColorConstants.white);
label.setForegroundColor(ColorConstants.black);
label.setOpaque(true);
rectangle.add(label);
this.add(rectangle);
}
protected void paintFigure(Graphics graphics) {
// Add padding to the label
label.setSize(label.getTextBounds().resize(35, 10).getSize());
// Set rectangle size, with some margin around the label
Dimension d = label.getSize().expand(40, 10);
rectangle.setSize(d);
// Center the label inside the rectangle
label.setLocation(rectangle.getLocation().translate(20, 5));
// Finally, set this figure's bounds
this.setBounds(rectangle.getBounds());
super.paintFigure(graphics);
}
}
我的类扩展了Figure而不是RectangleFigure，因为我想稍后添加一个ToolbarLayout，以在RectangleFigure+Label下方添加内容...现在我的问题：
- 有没有办法将图形（标签）居中它的父级（RectangleFigure）没有像我一样计算位置？
- 有没有办法向数字添加“填充”（导致类似于我在标签上设置的大小）或“边距”（从其子项和边距自动计算的大小？
- 一般来说，是否有更好的方法来实现我正在尝试做什么？
我在 api 文档中找不到任何方法，并且总体上缺少一些文档...提前谢谢您。
I'm a complete newbie with draw2d, i'm trying to make some examples in order to learn how to use it... I'm trying to write a Figure which shows a Label with white background, some padding, and an enclosing grey background. For that, i wrote the following:
public class MyFigure extends Figure {
private Label label;
private RectangleFigure rectangle;
public MyFigure() {
rectangle = new RectangleFigure();
rectangle.setBackgroundColor(ColorConstants.gray);
label = new Label("Test label");
label.setFont(new Font(null, "Arial", 12, SWT.BOLD));
label.setTextAlignment(PositionConstants.CENTER);
label.setBackgroundColor(ColorConstants.white);
label.setForegroundColor(ColorConstants.black);
label.setOpaque(true);
rectangle.add(label);
this.add(rectangle);
}
protected void paintFigure(Graphics graphics) {
// Add padding to the label
label.setSize(label.getTextBounds().resize(35, 10).getSize());
// Set rectangle size, with some margin around the label
Dimension d = label.getSize().expand(40, 10);
rectangle.setSize(d);
// Center the label inside the rectangle
label.setLocation(rectangle.getLocation().translate(20, 5));
// Finally, set this figure's bounds
this.setBounds(rectangle.getBounds());
super.paintFigure(graphics);
}
}
My class extends Figure instead RectangleFigure because i want to add a ToolbarLayout later, to add things below the RectangleFigure+Label... Now my questions:
- Is there any way to center a figure (Label) inside its parent (RectangleFigure) without calculating the position as i do?
- Is there any way to add "padding" to figures (resulting in something like the size i set on the Label) or "margin" (size calculated automatically from its children and a margin?
- Is there, in general, a better way to implement what i'm trying to do?
I can't find any method in the api docs, and there's some lack of documentation in general... Thank you in advance.
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BorderLayout，然后将标签的约束设置为CENTER。这应该自动处理居中。MarginBorder来填充数字。BorderLayoutand then set the Label's constraint toCENTER. This should handle the centering automatically.MarginBorderto pad your figures.