File indexing completed on 2024-02-25 03:46:48

0001 /*
0002     KmPlot - a math. function plotter for the KDE-Desktop
0003 
0004     SPDX-FileCopyrightText: 2006 David Saxton <david@bluehaze.org>
0005 
0006     This file is part of the KDE Project.
0007     KmPlot is part of the KDE-EDU Project.
0008 
0009     SPDX-License-Identifier: GPL-2.0-or-later
0010 
0011 */
0012 
0013 #include "equationeditwidget.h"
0014 
0015 #include <QFocusEvent>
0016 #include <QKeyEvent>
0017 #include <QStyle>
0018 #include <QStyleOptionFrame>
0019 #include <QWheelEvent>
0020 
0021 #include "equationedit.h"
0022 
0023 void EquationEditWidget::setClearSelectionOnFocusOut(bool doIt)
0024 {
0025     m_clearSelectionOnFocusOut = doIt;
0026 }
0027 
0028 EquationEditWidget::EquationEditWidget(EquationEdit *parent)
0029     : KTextEdit(parent)
0030 {
0031     m_clearSelectionOnFocusOut = true;
0032     m_parent = parent;
0033     recalculateGeometry();
0034 }
0035 
0036 void EquationEditWidget::recalculateGeometry()
0037 {
0038     // Set fixed height
0039     ensurePolished();
0040     QFontMetrics fm(document()->defaultFont());
0041     int h = qMax(fm.lineSpacing(), 14) + 6;
0042     int m = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
0043     QStyleOptionFrame opt;
0044     opt.rect = rect();
0045     opt.palette = palette();
0046     opt.state = QStyle::State_None;
0047     setFixedHeight(h + (2 * m));
0048 
0049     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
0050     setContentsMargins(0, 0, 0, 0);
0051     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
0052     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
0053     setWordWrapMode(QTextOption::NoWrap);
0054     setLineWrapMode(KTextEdit::NoWrap);
0055     setTabChangesFocus(true);
0056 }
0057 
0058 void EquationEditWidget::wheelEvent(QWheelEvent *e)
0059 {
0060     e->accept();
0061 }
0062 
0063 void EquationEditWidget::keyPressEvent(QKeyEvent *e)
0064 {
0065     if ((e->key() == Qt::Key_Return) || (e->key() == Qt::Key_Enter)) {
0066         e->accept();
0067         emit m_parent->editingFinished();
0068         emit m_parent->returnPressed();
0069     } else {
0070         // Still pass these keys to KTextEdit, in case the user has to scroll
0071         // up/down the text
0072         if (e->key() == Qt::Key_Up)
0073             emit m_parent->upPressed();
0074         else if (e->key() == Qt::Key_Down)
0075             emit m_parent->downPressed();
0076 
0077         KTextEdit::keyPressEvent(e);
0078     }
0079 }
0080 
0081 void EquationEditWidget::focusOutEvent(QFocusEvent *e)
0082 {
0083     KTextEdit::focusOutEvent(e);
0084 
0085     if (m_clearSelectionOnFocusOut)
0086         clearSelection();
0087     m_parent->reHighlight();
0088 
0089     emit m_parent->editingFinished();
0090 }
0091 
0092 void EquationEditWidget::focusInEvent(QFocusEvent *e)
0093 {
0094     KTextEdit::focusOutEvent(e);
0095 
0096     m_parent->reHighlight();
0097     if (e->reason() == Qt::TabFocusReason)
0098         selectAll();
0099 }
0100 
0101 void EquationEditWidget::clearSelection()
0102 {
0103     QTextCursor cursor = textCursor();
0104     if (!cursor.hasSelection())
0105         return;
0106 
0107     cursor.clearSelection();
0108     setTextCursor(cursor);
0109 }