QTableWidget：优先考虑特定列的水平空间

Question

我有一个 QTableWidget，它有一列 (#3) 比其他列需要更多空间。我想将所有列的大小调整为它们的内容，并优先考虑第 3 列。如果第 3 列将表格的宽度推到可用范围之外，我希望第 3 列被截断为 '...' 而没有水平滚动条。

下面的屏幕截图是我所追求的行为的最简单示例，但我不得不手动调整列宽。我希望表格自动执行此操作。

以下代码显示了我在 QTableWidget 上尝试过的示例，但没有一个有效。我提供了内联 cmets，说明为什么以下方法不起作用：

table->horizontalHeader()->setStretchLastSection(true);
table->resizeColumnsToContents();

感谢所有愿意抽出时间帮助我的人。

#include <QApplication>
#include <QTableWidget>
#include <QStringList>
#include <QRect>
#include <QLayout>
#include <QDialog>
#include <QHeaderView>

#include <iostream>

int main( int argc, char* argv[] )
{
    QApplication a(argc, argv);

    QDialog* d = new QDialog();
    d->setLayout( new QVBoxLayout() );

    QTableWidget* table = new QTableWidget(1,4);
    QStringList headers = {"1", "2", "3", "4"};
    table->setHorizontalHeaderLabels(headers);

    table->setItem(0, 0, new QTableWidgetItem("1"));
    table->setItem(0, 1, new QTableWidgetItem("22222"));
    table->setItem(0, 2, new QTableWidgetItem("33333333333333333333333333333"));
    table->setItem(0, 3, new QTableWidgetItem("4"));

    // Do nothing
    //
    //   The table exceeds the dimensions of the dialog,
    //   and we get a horizontal scrollbar

    // This also results in a horizontal scrollbar
    //
    //  table->horizontalHeader()->setStretchLastSection(true);

    // Resizing the columns introduces a horizontal scrollbar, and
    // prevents the user from from changing column width
    //
    //  table->resizeColumnsToContents();

    // The table fits, but all columns are equally spaced.
    // (We want column 3 to take up as much space as possible)
    //
    // table->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

    // Columns are resized to their contents,
    // but column 3 is not truncated and we get a horizontal scrollBar
    //
    //  table->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);

    d->layout()->addWidget( table );
    d->show();
    return a.exec();
}

Answer 1

应该可以，试试看

#include <QApplication>
#include <QTableWidget>
#include <QStringList>
#include <QRect>
#include <QLayout>
#include <QDialog>
#include <QHeaderView>
#include <QScrollBar>

#include <iostream>

int main( int argc, char* argv[] )
{
QApplication a(argc, argv);

QDialog* d = new QDialog();
d->setLayout( new QVBoxLayout() );

QTableWidget* table = new QTableWidget(1,4);
QStringList headers = {"1", "2", "3", "4"};
table->setHorizontalHeaderLabels(headers);

table->setItem(0, 0, new QTableWidgetItem("1"));
table->setItem(0, 1, new QTableWidgetItem("22222"));
table->setItem(0, 2, new QTableWidgetItem("33333333333333333333333333333"));
table->setItem(0, 3, new QTableWidgetItem("4"));

// Do nothing
//
//   The table exceeds the dimensions of the dialog,
//   and we get a horizontal scrollbar

// This also results in a horizontal scrollbar
//
//  table->horizontalHeader()->setStretchLastSection(true);

// Resizing the columns introduces a horizontal scrollbar, and
// prevents the user from changing column width
//

 //resize table
  d->layout()->addWidget( table );
  d->show();

  table->resizeColumnsToContents();

  int tableWidth = table->width();
  int columsWidth = 0;
  int maxColumnWidth = 0;
  int maxColumnIndex = 0;
  int w = 0;

  for(int n = 0; n < table->columnCount(); n++)
  {
      w = table->columnWidth(n);
      columsWidth += w;
      if(w > maxColumnWidth)
      {
          maxColumnWidth = w;
          maxColumnIndex = n;
      }
  }

  if(columsWidth > tableWidth)
  {
      int delta = columsWidth - tableWidth + table->horizontalScrollBar()->height();
      maxColumnWidth -= delta;
      if(maxColumnWidth < 0)
          maxColumnWidth = 0;
      table->setColumnWidth(maxColumnIndex, maxColumnWidth);
  }

// This table fits, but all the columns are equally spaced.
// (We want column 3 to take up as much space as possible)
//
// table->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

// Columns are resized to their contents,
// but column 3 is not truncated and we get a horizontal scrollBar
//
//  table->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);

return a.exec();

}

如果您对此代码有任何问题，请与我联系。