101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
/* by XY0797 2024.2.21 */
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#include "filenameeditdelegate.h"
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#include <QLineEdit>
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#include <qapplication.h>
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// Custom edit box control. This is necessary because the default behavior of a QLineEdit when it gains focus is to select all its text, and if a selection is set before gaining focus, it will be overridden by the select-all action upon focusing.
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class FilenameLineEdit : public QLineEdit
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{
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public:
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explicit FilenameLineEdit(QWidget *parent = nullptr) : QLineEdit(parent) {}
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// Add a custom method to set the selection on focus gain.
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void setFocusSelectState(int index, int length)
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{
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m_focusSelectionStart = index;
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m_focusSelectionLength = length;
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}
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protected:
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int m_focusSelectionStart = -1;
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int m_focusSelectionLength = -1;
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// Override the focus-in event, resetting the selection before executing the default operation.
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void focusInEvent(QFocusEvent *event) override
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{
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if (m_focusSelectionStart != -1 && m_focusSelectionLength > 0)
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{
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deselect();
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setSelection(m_focusSelectionStart, m_focusSelectionLength);
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}
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QLineEdit::focusInEvent(event);
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}
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};
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// Return the last occurrence index of '.' in the string; if not found, return the length of the string.
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int findDotPosition(const QString &fileName)
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{
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int dotPosition = fileName.lastIndexOf('.');
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if (dotPosition != -1)
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{
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return dotPosition;
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}
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else
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{
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return fileName.length();
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}
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}
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// Below follows the implementation of the delegate class.
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FilenameEditDelegate::FilenameEditDelegate(QObject *parent) : QStyledItemDelegate(parent) {}
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// Use our custom component when creating the editor.
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QWidget *FilenameEditDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &/*option*/, const QModelIndex &/*index*/) const
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{
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FilenameLineEdit *editor = new FilenameLineEdit(parent);
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return editor;
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}
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// Set the content, and if the item is a file, set the selection on focus gain to exclude the file extension.
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void FilenameEditDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
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{
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FilenameLineEdit *lineEdit = (FilenameLineEdit *)editor;
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if (!lineEdit) { return; }
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QString fileName = index.data().toString();
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lineEdit->setText(fileName);
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// Determine whether the currently edited item is a directory or a file; if it's a directory, there's no need to set a selection.
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Qt::ItemFlags flags = index.flags();
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if (flags & Qt::ItemNeverHasChildren) {
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lineEdit->setFocusSelectState(0, findDotPosition(fileName));
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}
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}
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// Return the edited data back to the QTreeView.
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void FilenameEditDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
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{
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FilenameLineEdit *lineEdit = (FilenameLineEdit *)editor;
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if (!lineEdit) { return; }
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model->setData(index, lineEdit->text());
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}
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// Override the method for updating the editor's position.
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void FilenameEditDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
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{
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FilenameLineEdit *lineEdit = (FilenameLineEdit *)editor;
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if (!lineEdit) { return; }
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const QWidget *widget = option.widget;
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QStyleOptionViewItem opt = option;
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initStyleOption(&opt, index);
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opt.showDecorationSelected = true;
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QStyle *style = widget ? widget->style() : QApplication::style();
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QRect geom = style->subElementRect(QStyle::SE_ItemViewItemText, &opt, widget);
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lineEdit->setGeometry(geom);
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}
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