File indexing completed on 2024-05-19 04:36:40

 /* This file is part of the TikZKit project.
  *
  * Copyright (C) 2014 Dominik Haumann <dhaumann@kde.org>
  *
  * This code is based on the KisSliderSpinBox used in Krita:
  * Copyright (c) 2010 Justin Noel <justin@ics.com>
  * Copyright (c) 2010 Cyrille Berger <cberger@cberger.net>
  *
  * This library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Library General Public License as published
  * by the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, see
  * <http://www.gnu.org/licenses/>.
  */
 
 #include "SliderSpinBox.h"
 
 #include <cmath>
 
 #include <QStyle>
 #include <QLineEdit>
 #include <QKeyEvent>
 #include <QMouseEvent>
 #include <QStylePainter>
 #include <QStyleOptionSpinBox>
 #include <QStyleOptionProgressBar>
 #include <QContextMenuEvent>
 #include <QCursor>
 #include <QDebug>
 
 class SliderSpinBoxPrivate
 {
 public:
     SliderSpinBoxPrivate(SliderSpinBox * spinBox)
         : q(spinBox)
     {}
 
     QStyleOptionSpinBox spinBoxOptions() const;
     QStyleOptionProgressBar progressBarOptions() const;
     QRect progressRect(const QStyleOptionSpinBox& spinBoxOptions) const;
     QRect upButtonRect(const QStyleOptionSpinBox& spinBoxOptions) const;
     QRect downButtonRect(const QStyleOptionSpinBox& spinBoxOptions) const;
     int valueForX(int x) const;
     void showLineEdit();
 
 public:
     SliderSpinBox * const q;
     bool pressedInButton;
 };
 
 QStyleOptionSpinBox SliderSpinBoxPrivate::spinBoxOptions() const
 {
     QStyleOptionSpinBox opts;
     opts.initFrom(q);
     opts.frame = false;
     opts.subControls &= ~0x4; // SC_SpinBoxFrame
     opts.subControls &= ~0x8; // SC_SpinBoxEditField
 
     if (q->value() == q->minimum()) {
         opts.stepEnabled = QAbstractSpinBox::StepUpEnabled;
     } else if (q->value() == q->maximum()) {
         opts.stepEnabled = QAbstractSpinBox::StepDownEnabled;
     } else {
         opts.stepEnabled = QAbstractSpinBox::StepUpEnabled | QAbstractSpinBox::StepDownEnabled;
     }
 
     //Deal with depressed buttons
     QPoint mousePos = q->mapFromGlobal(QCursor::pos());
     if (upButtonRect(opts).contains(mousePos)) {
         opts.activeSubControls = QStyle::SC_SpinBoxUp;
     } else if (downButtonRect(opts).contains(mousePos)) {
         opts.activeSubControls = QStyle::SC_SpinBoxDown;
     } else {
         opts.activeSubControls = QStyle::SC_None;
     }
 
     return opts;
 }
 
 QStyleOptionProgressBar SliderSpinBoxPrivate::progressBarOptions() const
 {
     QStyleOptionSpinBox spinOpts = spinBoxOptions();
 
     //Create opts for drawing the progress portion
     QStyleOptionProgressBar progressOpts;
     progressOpts.initFrom(q);
     progressOpts.maximum = q->maximum();
     progressOpts.minimum = q->minimum();
     progressOpts.progress = q->value();
     progressOpts.text = QString::number(q->value()) + q->suffix();
     progressOpts.textAlignment = Qt::AlignCenter;
     progressOpts.textVisible = ! q->lineEdit()->isVisible();
 
     //Change opts rect to be only the ComboBox's text area
     progressOpts.rect = progressRect(spinOpts);
 
     return progressOpts;
 }
 
 QRect SliderSpinBoxPrivate::progressRect(const QStyleOptionSpinBox& spinBoxOptions) const
 {
     return q->style()->subControlRect(QStyle::CC_SpinBox,
                                       &spinBoxOptions,
                                       QStyle::SC_SpinBoxEditField);
 }
 
 int SliderSpinBoxPrivate::valueForX(int x) const
 {
     QStyleOptionSpinBox spinOpts = spinBoxOptions();
 
     // adjust for border used in the QStyles (FIXME: probably not exact)
     QRect correctedProgRect = progressRect(spinOpts).adjusted(2, 2, -2, -2);
 
     const int left = correctedProgRect.left();
     const int right = correctedProgRect.right();
     const int val = qMax(0, x - left);
 
     const int range = q->maximum() - q->minimum();
     qreal percent = static_cast<qreal>(val) / (right - left);
 
     if (q->layoutDirection() == Qt::RightToLeft) {
         percent = 1 - percent;
     }
 
     return q->minimum() + qRound(percent * (range));
 }
 
 QRect SliderSpinBoxPrivate::upButtonRect(const QStyleOptionSpinBox& spinBoxOptions) const
 {
     return q->style()->subControlRect(QStyle::CC_SpinBox,
                                       &spinBoxOptions,
                                       QStyle::SC_SpinBoxUp);
 }
 
 QRect SliderSpinBoxPrivate::downButtonRect(const QStyleOptionSpinBox& spinBoxOptions) const
 {
     return q->style()->subControlRect(QStyle::CC_SpinBox,
                                       &spinBoxOptions,
                                       QStyle::SC_SpinBoxDown);
 }
 
 void SliderSpinBoxPrivate::showLineEdit()
 {
     if (!q->lineEdit()->isVisible()) {
         q->lineEdit()->setVisible(true);
         q->lineEdit()->setText(QString::number(q->value()));
         q->lineEdit()->selectAll();
     }
 }
 
 
 
 
 
 
 
 SliderSpinBox::SliderSpinBox(QWidget * parent)
     : QSpinBox(parent)
     , d(new SliderSpinBoxPrivate(this))
 {
     d->pressedInButton = false;
 
     // mouse tracking is required for the mouse-over effect on the up/down buttons
     setMouseTracking(true);
 
     // seup line edit
     lineEdit()->setFrame(false);
     lineEdit()->setAlignment(Qt::AlignCenter);
 
     // since the line edit is an overlay, do not autofill the background
     lineEdit()->setAutoFillBackground(false);
 
     // change the background color of the line edit to transparent
     QPalette pal = lineEdit()->palette();
     pal.setColor(QPalette::Base, Qt::transparent);
     lineEdit()->setPalette(pal);
 
     // hide line edit by default
     lineEdit()->hide();
 
     // make sure text is only accepted on editingFinished()
     lineEdit()->disconnect(this);
     connect(this, SIGNAL(editingFinished()), lineEdit(), SLOT(hide()));
 }
 
 SliderSpinBox::~SliderSpinBox()
 {
     delete d;
 }
 
 void SliderSpinBox::paintEvent(QPaintEvent* event)
 {
     Q_UNUSED(event)
 
     //
     // draw the QSpinBox without frame (see spinBoxOptions())
     //
     QStyleOptionSpinBox opt = d->spinBoxOptions();
     QStylePainter p(this);
     p.drawComplexControl(QStyle::CC_SpinBox, opt);
 
     //
     // draw progress bar background on top of the spin box
     //
     QStyleOptionProgressBar progressOpts = d->progressBarOptions();
     p.drawControl(QStyle::CE_ProgressBar, progressOpts);
 
     //
     // draw the progress bar label, if applicable
     //
     if (progressOpts.textVisible) {
         p.drawControl(QStyle::CE_ProgressBarLabel, progressOpts);
     }
 }
 
 void SliderSpinBox::mousePressEvent(QMouseEvent * event)
 {
     if (event->buttons() & Qt::LeftButton) {
         QStyleOptionSpinBox spinOpts = d->spinBoxOptions();
         // mouse in progress area?
         if (d->progressRect(spinOpts).contains(event->pos())
             && ! lineEdit()->isVisible())
         {
             setValue(d->valueForX(event->pos().x()));
         }
         // mouse over up-button?
         else if (d->upButtonRect(spinOpts).contains(event->pos())) {
             setValue(value() + singleStep());
             d->pressedInButton = true;
         }
         // mouse over down-button?
         else if (d->downButtonRect(spinOpts).contains(event->pos())) {
             setValue(value() - singleStep());
             d->pressedInButton = true;
         } else {
             // whatever this mouse press is, just pass it on
             QSpinBox::mousePressEvent(event);
         }
     } else if (event->buttons() & Qt::RightButton) {
         // right now, RMB switches into line edit mode
         d->showLineEdit();
     }
 }
 
 void SliderSpinBox::mouseReleaseEvent(QMouseEvent * event)
 {
     if (d->pressedInButton && event->button() == Qt::LeftButton) {
         d->pressedInButton = false;
     }
 
     QSpinBox::mouseReleaseEvent(event);
 }
 
 void SliderSpinBox::mouseMoveEvent(QMouseEvent * event)
 {
     if (event->buttons() & Qt::LeftButton) {
         QStyleOptionSpinBox spinOpts = d->spinBoxOptions();
         if (d->progressRect(spinOpts).contains(event->pos())
             && ! lineEdit()->isVisible()
             && ! d->pressedInButton)
         {
             // on LMB: mouse move sets new value
             setValue(d->valueForX(event->pos().x()));
         }
     }
 
     // always trigger update, since the cursor might hover over the up/down buttons
     update();
 }
 
 void SliderSpinBox::contextMenuEvent(QContextMenuEvent * event)
 {
     // we don't want any context menu.
     // Instad, we show the line edit and, thus, change to edit mode.
     event->accept();
 }
 
 void SliderSpinBox::keyPressEvent(QKeyEvent * event)
 {
     if (lineEdit()->isVisible()) {
         // on Escape, just hide the line edit and do nothing
         if (event->key() == Qt::Key_Escape) {
             lineEdit()->hide();
         }
         QSpinBox::keyPressEvent(event);
         return;
     }
 
     switch (event->key()) {
         case Qt::Key_Up:
         case Qt::Key_Right:
             setValue(value() + singleStep());
             break;
         case Qt::Key_Down:
         case Qt::Key_Left:
             setValue(value() - singleStep());
             break;
         case Qt::Key_Escape:
             // do nothing
             break;
         default:
             // for all other keys, show the line edit and pass the event to
             // the line edit so that the typed digit already counts as input
             d->showLineEdit();
             lineEdit()->event(event);
             break;
     }
 }
 
 // kate: indent-width 4; replace-tabs on;