JTable 自动调整大小,有什么变化吗?
这是一个众所周知的 JTable 自动调整器:
public JTable autoResizeColWidth(JTable table, DefaultTableModel model) {
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setModel(model);
int margin = 5;
for (int i = 0; i < table.getColumnCount(); i++) {
int vColIndex = i;
DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel();
TableColumn col = colModel.getColumn(vColIndex);
int width = 0;
// Get width of column header
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer == null) {
renderer = table.getTableHeader().getDefaultRenderer();
}
Component comp = renderer.getTableCellRendererComponent(table, col.getHeaderValue(), false, false, 0, 0);
width = comp.getPreferredSize().width;
// Get maximum width of column data
for (int r = 0; r < table.getRowCount(); r++) {
renderer = table.getCellRenderer(r, vColIndex);
comp = renderer.getTableCellRendererComponent(table, table.getValueAt(r, vColIndex), false, false,
r, vColIndex);
width = Math.max(width, comp.getPreferredSize().width);
}
// Add margin
width += 2 * margin;
// Set the width
col.setPreferredWidth(width);
}
((DefaultTableCellRenderer) table.getTableHeader().getDefaultRenderer()).setHorizontalAlignment(
SwingConstants.LEFT);
// table.setAutoCreateRowSorter(true);
table.getTableHeader().setReorderingAllowed(false);
return table;
}
这里的问题是返回的表缩小(宽度)
所以如果我的 JTable 组件是 100%,返回的列区域可能只有 70%(比如说)
如果我想要自动调整大小怎么办,记住整个 JTable 的原始设置宽度。因此,即使调整大小后,所有列也能正确安装。
This is a well known autoresizer for JTable :
public JTable autoResizeColWidth(JTable table, DefaultTableModel model) {
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setModel(model);
int margin = 5;
for (int i = 0; i < table.getColumnCount(); i++) {
int vColIndex = i;
DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel();
TableColumn col = colModel.getColumn(vColIndex);
int width = 0;
// Get width of column header
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer == null) {
renderer = table.getTableHeader().getDefaultRenderer();
}
Component comp = renderer.getTableCellRendererComponent(table, col.getHeaderValue(), false, false, 0, 0);
width = comp.getPreferredSize().width;
// Get maximum width of column data
for (int r = 0; r < table.getRowCount(); r++) {
renderer = table.getCellRenderer(r, vColIndex);
comp = renderer.getTableCellRendererComponent(table, table.getValueAt(r, vColIndex), false, false,
r, vColIndex);
width = Math.max(width, comp.getPreferredSize().width);
}
// Add margin
width += 2 * margin;
// Set the width
col.setPreferredWidth(width);
}
((DefaultTableCellRenderer) table.getTableHeader().getDefaultRenderer()).setHorizontalAlignment(
SwingConstants.LEFT);
// table.setAutoCreateRowSorter(true);
table.getTableHeader().setReorderingAllowed(false);
return table;
}
The problem here is that the returned table shrinks (in width)
So if my JTable component is 100%, the returned column area may only be 70% (say)
What if i want the autoresize, keeping in mind the original set width of the JTable as a whole. So that even after resizing, all the columns fit in properly.
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我已设法改进上述代码以考虑表大小:
请注意,表数据中的循环执行了两次。另外,我更喜欢该函数独立于 JTable 实例,以便能够从我的项目中的任何 JTable 调用它。
I have managed to improve the above code in order to consider the table size:
Note that the loop in table data is executed twice. Also, I prefer the function to be independent of JTable instance to be able to call it from any JTable in my projects.