Java 如何将控件设置为透明背景
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原文地址: http://stackoverflow.com/questions/20975980/
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How to set a control to a transparent background
提问by Sarah Weinberger
How do I set the background of a control to be transparent?
如何将控件的背景设置为透明？
I am speaking of Labeland Textcontrols at the moment, but can be any of the standard controls that I see in the GUI.
我所说的Label和Text此刻的控制，但可以是任何的标准控件，我在GUI中看到的。
采纳答案by Baz
shell.setBackgroundMode(SWT.INHERIT_FORCE);
will do what you want.
会做你想做的。
The
Compositeconstant to indicate that an attribute (such as background) is inherited by all children.
Composite指示属性（例如背景）由所有子项继承的常量。
public static void main(String[] args)
{
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(1, false));
shell.setText("StackOverflow");
shell.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
shell.setBackgroundMode(SWT.INHERIT_FORCE);
new Button(shell, SWT.PUSH).setText("Button");
new Label(shell, SWT.NONE).setText("Label");
shell.pack();
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
{
display.sleep();
}
}
display.dispose();
}
Looks like this:
看起来像这样：
回答by Konstantin Komissarchik
You need to make the following call on your composite before child controls, such as Labels will inherit the background from the composite.
您需要在子控件之前对您的复合进行以下调用，例如标签将从复合中继承背景。
composite.setBackgroundMode( SWT.INHERIT_DEFAULT );
回答by Thomas S.
According to my knowledge you can'tset a control (except of a shell on some operating systems) transparent or semitransparent in SWT, e.g. show a panel in front of a table control where the table will show through the panel. As the other posters wrote, one only can inherit the background.
据我所知，您不能在 SWT 中设置透明或半透明控件（某些操作系统上的外壳除外），例如在表格控件前面显示面板，表格将通过面板显示。正如其他海报所写，一个只能继承背景。
回答by thSoft
If you add a Composite and specify the following flags, it will be transparent: new Composite(shell, SWT.TRANSPARENT | SWT.NO_BACKGROUND);
如果您添加一个 Composite 并指定以下标志，它将是透明的： new Composite(shell, SWT.TRANSPARENT | SWT.NO_BACKGROUND);
