Draw2d 学习笔记七 GridLayout布局管理器-优快云博客

本文介绍了一个使用Draw2dGridLayout布局管理器创建GUI界面的例子。通过设置不同大小提示的RectangleFigure对象，并利用GridData控制其在GridLayout中的位置与大小，展示了如何组织GUI组件。

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关键字：Draw2d GridLayout 布局管理器GridData

public class HelloWorld {
	public static void main(String args[]) {
		Shell shell = new Shell();
		shell.setText("Draw2d Hello World");
		shell.setSize(300, 300); shell.open();
		
		// create content 4 shell.
		createContent4Shell(shell);
		
		while (!shell.isDisposed ()) {
			if (!Display.getDefault().readAndDispatch ())
				Display.getDefault().sleep ();
		}
	}

	private static void createContent4Shell(Shell shell) {
		Figure container = new Figure();
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 2;
		container.setLayoutManager(gridLayout);

		Shape rect;
		rect = new RectangleFigure();
		container.add(rect);
		GridData gridData = new GridData();
		gridData.widthHint = 50;		gridData.heightHint = 50;
		gridLayout.setConstraint(rect, gridData);

		rect = new RectangleFigure();
		gridData = new GridData();
		gridData.widthHint = 100;		gridData.heightHint = 100;
		gridLayout.setConstraint(rect, gridData);
		container.add(rect);

		rect = new RectangleFigure();
		gridData = new GridData();
		gridData.widthHint = 150;		gridData.heightHint = 150;
		gridLayout.setConstraint(rect, gridData);
		container.add(rect);
		
		LightweightSystem lws = new LightweightSystem(shell);
		lws.setContents(container);
	}
}