如何在QTreeView列中禁用复选框，但保持整行可选。

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英文:

How to disable checkboxes in QTreeView columns but keep the entire row selectable

问题

I'm using a QTreeView and a custom model derived from QAbstractItemModel to display rows with 3 checkboxes per row.

The selection behaviour is set to select entire rows.
The checkboxes are added via returning a Qt::CheckState in the model's data()-function.

The model's flags()-function returns Qt::ItemIsUserCheckable for all model indices that have a checkbox. Depending on the state of the third checkbox, checkbox 1 and 2 shall be enabled or disabled.

  1. Qt::ItemFlags MyModel::flags(QModelIndex const& index) const {
  2.     Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
  4.     if(index.column() > 0) {
  5.         flags = flags | Qt::ItemIsUserCheckable;
  6.     }
  8.     if(thirdCheckboxChecked(index) && (index.column() == 1 || index.column() == 2) ) {
  9.         flags = flags & ~Qt::ItemIsEnabled;
  10.     }
  12.     return flags;
  13. }

I have tried to disable the checkboxes via the model's flags()-function (by not returning Qt::ItemIsEnabled if the third checkbox is checked) but this will disable the entire item, disabling the selection for the entire item / cell resulting in this behaviour:

如何在QTreeView列中禁用复选框，但保持整行可选。

How can I access the checkboxes and disable them without disabling the entire items?

英文:

I'm using a QTreeView and a custom model derived from QAbstractItemModel to display rows with 3 checkboxes per row.

The selection behaviour is set to select entire rows.
The checkboxes are added via returning a Qt::CheckState in the model's data()-function.

The model's flags()-function returns Qt::ItemIsUserCheckable for all model indices that have a checkbox. Depending on the state of the third checkbox, checkbox 1 and 2 shall be enabled or disabled.

  1. Qt::ItemFlags MyModel::flags(QModelIndex const& index) const {
  2.     Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
  4.     if(index.column() > 0) {
  5.         flags = flags | Qt::ItemIsUserCheckable;
  6.     }
  8.     if(thirdCheckboxChecked(index) && (index.column() == 1 || index.column() == 2) ) {
  9.         flags = flags & ~Qt::ItemIsEnabled;
  10.     }
  12.     return flags;
  13. }

I have tried to disable the checkboxes via the model's flags()-function (by not returning Qt::ItemIsEnabled if the third checkbox is checked) but this will disable the entire item, disabling the selection for the entire item / cell resulting in this behaviour:

如何在QTreeView列中禁用复选框，但保持整行可选。

How can I access the checkboxes and disable them without disabling the entire items?

答案1

得分: 0

以下是代码的翻译部分：

  1. 尝试使用代理？仅使复选框变灰，不使单元格变灰：
  3. #include <QtWidgets/QApplication>
  4. #include <qt_windows.h>
  5. #include <QTableView>
  6. #include <QAbstractTableModel>
  7. #include <QStyledItemDelegate>
  8. #include <QPainter>
  10. int checkstat[4] = { Qt::Checked,Qt::Checked,Qt::Unchecked,Qt::Unchecked };
  11. int checkenable[4] = { 1,1,0,0 };
  13. class delegate :public QStyledItemDelegate
  14. {
  15.     Q_OBJECT
  16. public:
  17.     virtual void paint(QPainter* painter, const QStyleOptionViewItem& option
  18.         , const QModelIndex& index) const override
  19.     {
  20.         QStyledItemDelegate::paint(painter, option, index);
  21.         if (index.column() == 1)
  22.         {
  23.             QStyle* style = QApplication::style();
  24.             QStyleOptionButton butOpt;
  25.             butOpt.rect.setX(option.rect.x() + option.rect.width() / 2);
  26.             butOpt.rect.setY(option.rect.y());
  27.             butOpt.rect.setWidth(option.rect.width() / 4);
  28.             butOpt.rect.setHeight(option.rect.height());
  29.             if (checkenable[index.row()]) butOpt.state = QStyle::State_Enabled;
  30.             butOpt.state |= checkstat[index.row()] ? QStyle::State_On : QStyle::State_Off;
  31.             style->drawControl(QStyle::CE_CheckBox, &butOpt, painter);
  32.         }
  34.     }
  35. };
  37. class tablemodel :public QAbstractTableModel
  38. {
  39.     Q_OBJECT
  40. public:
  41.     Q_INVOKABLE virtual int rowCount(const QModelIndex& parent = QModelIndex()) const
  42.     {
  43.         return 4;
  44.     }
  45.     Q_INVOKABLE virtual int columnCount(const QModelIndex& parent = QModelIndex()) const
  46.     {
  47.         return 2;
  48.     }
  50.     Q_INVOKABLE virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const
  51.     {
  52.         if (index.column() == 0 && role == Qt::DisplayRole)
  53.         {
  54.             return QString::number(index.row()) + '-' + QString::number(index.column());
  55.         }
  56.         return QVariant();
  57.     }
  58.     Qt::ItemFlags flags(const QModelIndex& index) const override
  59.     {
  60.         return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
  61.     }
  62. };
  63. int main(int argc, char *argv[])
  64. {
  65.     QApplication a(argc, argv);
  66.     QTableView view;
  67.     tablemodel m;
  68.     delegate d;
  69.     view.setItemDelegate(&d);
  70.     view.setModel(&m);
  71.     view.show();
  72.     //QtWidgetsApplication1 w;
  73.     //w.show();
  74.     return a.exec();
  75. }
  76. #include "main.moc"

请注意，我已将代码部分翻译成中文。

英文:

try using a delegate? gray out only checkbox, doesnot gray out cell:如何在QTreeView列中禁用复选框，但保持整行可选。

  1. #include &lt;QtWidgets/QApplication&gt;
  2. #include&lt;qt_windows.h&gt;
  3. #include &lt;QTableView&gt;
  4. #include &lt;QAbstractTableModel&gt;
  5. #include &lt;QStyledItemDelegate&gt;
  6. #include &lt;QPainter&gt;
  7. int checkstat[4] = { Qt::Checked,Qt::Checked,Qt::Unchecked,Qt::Unchecked };
  8. int checkenable[4] = { 1,1,0,0 };
  9. class delegate :public QStyledItemDelegate
  10. {
  11. Q_OBJECT
  12. public:
  13. virtual void paint(QPainter* painter, const QStyleOptionViewItem&amp; option
  14. , const QModelIndex&amp; index) const override
  15. {
  16. QStyledItemDelegate::paint(painter, option, index);
  17. if (index.column() == 1)
  18. {
  19. QStyle* style = QApplication::style();
  20. QStyleOptionButton butOpt;
  21. butOpt.rect.setX(option.rect.x()+ option.rect.width()/2);
  22. butOpt.rect.setY(option.rect.y());
  23. butOpt.rect.setWidth(option.rect.width()/4);
  24. butOpt.rect.setHeight(option.rect.height());
  25. if(checkenable[index.row()])butOpt.state = QStyle::State_Enabled;
  26. butOpt.state |= checkstat[index.row()] ? QStyle::State_On : QStyle::State_Off;
  27. style-&gt;drawControl(QStyle::CE_CheckBox, &amp;butOpt, painter);
  28. }
  29. }
  30. };
  31. class tablemodel :public QAbstractTableModel
  32. {
  33. Q_OBJECT
  34. public:
  35. Q_INVOKABLE virtual int rowCount(const QModelIndex&amp; parent = QModelIndex()) const
  36. {
  37. return 4;
  38. }
  39. Q_INVOKABLE virtual int columnCount(const QModelIndex&amp; parent = QModelIndex()) const
  40. {
  41. return 2;
  42. }
  43. Q_INVOKABLE virtual QVariant data(const QModelIndex&amp; index, int role = Qt::DisplayRole) const
  44. {
  45. if (index.column() == 0&amp;&amp; role==Qt::DisplayRole)
  46. {
  47. return QString::number(index.row()) + &#39;-&#39; + QString::number(index.column());
  48. }
  49. return QVariant();
  50. }
  51. Qt::ItemFlags flags(const QModelIndex&amp; index) const override
  52. {
  53. return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
  54. }
  55. };
  56. int main(int argc, char *argv[])
  57. {
  58. QApplication a(argc, argv);
  59. QTableView view;
  60. tablemodel m;
  61. delegate d;
  62. view.setItemDelegate(&amp;d);
  63. view.setModel(&amp;m);
  64. view.show();
  65. //QtWidgetsApplication1 w;
  66. //w.show();
  67. return a.exec();
  68. }
  69. #include&quot;main.moc&quot;

huangapple
  • 本文由 发表于 2023年5月22日 18:22:38
  • 转载请务必保留本文链接：https://go.coder-hub.com/76305195.html
  • c++
  • qt
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