带有flowlayout的java scrollpane [英] java scrollpane with flowlayout

问题描述

出于某种原因，我不能这样做。它应该很简单。

For some reason, I cannot this working. It should be simple really.

我有一个带有 BorderLayout 的JFrame，其中包含 JPanel （南）和（CENTER）JPanel（itemPanel）。

I've having a JFrame with a BorderLayout, which contains a JPanel (SOUTH) and a (CENTER) JPanel (itemPanel).

itemPanel应该包含在滚动窗格中。它的width = x，并且它的所有子节点共享它的长度，所以它基本上就像一个只有1列的表。

itemPanel should be wrapped in a scrollpane. Its width = x, and all of its children shares its length, so it basically works like a table with only 1 column.

出于某种原因，我无法获得滚动窗格来显示滚动条（和滚动）。在JFrame中：

For some reason, I cannot get the scrollpane to show the scrollbars (and scroll). In the JFrame:

setPreferredSize(dimension);
setDefaultCloseOperation(EXIT_ON_CLOSE);
getContentPane().add("South",controlPanel);
JScrollPane scroll = new JScrollPane(itemPanel);
scroll.setBorder(null);
getContentPane().add("Center",scroll);
super.pack();
setVisible(true);

启动并添加一些虚拟面板到itemPanel：

Initilizing and adding some dummy-panels to the itemPanel:

itemPanel = new ItemPanel(); // A JPanel with a flowlayout
itemPanel.setPreferredSize(new Dimension(dimension.width,0));
for(int i = 0; i < 20; i++){
  JPanel p = new JPanel();
  p.setPreferredSize(new Dimension(0,50));
  p.setBackground(i%2 == 0 ? Color.GREEN : Color.YELLOW);
  itemPanel.add(p);
}

如果省略 itemPanel.setPreferredSize（new Dimension（dimension） .width，0））; 滚动窗格显示水平滚动条，但由于flowlayout没有要跟随的宽度，它只显示一行中的组件。

if omitting itemPanel.setPreferredSize(new Dimension(dimension.width,0)); the scrollpane shows the horizontal scrollbars, but since the flowlayout does not have a width to follow, it just shows the components in one row.

推荐答案

WrapLayout 可能就是你要找的东西。

WrapLayout may be what you are looking for.

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