打包，但不要让它变小

发布于 2024-11-17 03:45:31 字数 518 浏览 2 评论 0原文

我有 JFrame 和 GridBagLayout。用户可以调整该窗口的大小。此外，他还可以执行一些更改窗口大小的编辑操作。我使用 pack(); repaint(); 现在在这些操作之后。但是，实际上我不应该在此类操作后使窗口变小 - 只能变大。我发现的解决方案是

    Dimension oldSize = getSize();
    pack();
    Dimension newSize = window.getSize();
    setSize(
            (int) Math.max(newSize.getWidth(), oldSize.getWidth()),
            (int) Math.max(newSize.getHeight(), oldSize.getHeight()));
    repaint();

但我根本不喜欢这个解决方案。除了丑陋的代码之外，我们还设置了两次大小（一次是通过包，一次是直接设置）。还有其他解决方案吗？

原文

I have JFrame with GridBagLayout. User can resize this window. Also, he can perform some editing actions that change window size. I use pack(); repaint(); now after such actions. But, actually I shouldn't make window smaller after such operations - only bigger. What I found as solution is

    Dimension oldSize = getSize();
    pack();
    Dimension newSize = window.getSize();
    setSize(
            (int) Math.max(newSize.getWidth(), oldSize.getWidth()),
            (int) Math.max(newSize.getHeight(), oldSize.getHeight()));
    repaint();

But I don't like this solution at all. Beside ugly code, we set size twice (once by pack and than directly). Is there any other solutions?

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烈酒灼喉 2024-11-24 03:45:31

一个简单的解决方案是使用这样的东西：

frame.setMinimumSize(frame.getSize());
frame.pack();
frame.setMinimumSize(null);

我认为，这不会允许 pack() 使窗口变小，只会变大。
通过在 pack() 之后将最小大小重置为 null，我们可以避免阻止用户随后将其大小调整得更小。

最后你不应该需要 repaint() ，大小的改变应该自行触发重绘。（当然，请确保所有这些操作都发生在事件调度线程中。）

A simple solution would be to use something like this:

frame.setMinimumSize(frame.getSize());
frame.pack();
frame.setMinimumSize(null);

This will not allow pack() to make the window smaller, only bigger, I think.
By resetting the minimum size to null after the pack() we avoid preventing the user on resizing it smaller afterwards.

You should not need a repaint() at the end, the size changing should trigger a repaint by itself. (Of course, make sure that all these actions happen in the event dispatch thread.)

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你爱我像她 2024-11-24 03:45:31

Paŭlo 提出的解决方案的另一种解决方案是以下代码：

private boolean greater(Dimension left, Dimension right) {
    return left.getHeight() > right.getHeight() || left.getWidth() > right.getWidth();
}

if (greater(window.getPreferredSize(), window.getSize())) {
    window.pack();
}

该解决方案的优点是除非有必要，否则不会调用 pack，并且它避免了我们在使用 Paŭlo 解决方案时在 Linux 上观察到的闪烁。

An alternative solution to the one proposed by Paŭlo is the following code:

private boolean greater(Dimension left, Dimension right) {
    return left.getHeight() > right.getHeight() || left.getWidth() > right.getWidth();
}

if (greater(window.getPreferredSize(), window.getSize())) {
    window.pack();
}

The advantage of this solution is that pack isn't called unless it is necessary, and it avoids a flicker we observed on Linux with Paŭlo's solution.

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