File indexing completed on 2024-10-06 12:53:59

 // SPDX-FileCopyrightText: 2023 James Graham <james.h.graham@protonmail.com>
 // SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 #include "delegatesizehelper.h"
 
 #include <cmath>
 
 #include <QDebug>
 
 DelegateSizeHelper::DelegateSizeHelper(QObject *parent)
     : QObject(parent)
 {
 }
 
 qreal DelegateSizeHelper::parentWidth() const
 {
     return m_parentWidth;
 }
 
 void DelegateSizeHelper::setParentWidth(qreal parentWidth)
 {
     if (parentWidth == m_parentWidth) {
         return;
     }
     m_parentWidth = parentWidth;
     Q_EMIT parentWidthChanged();
     Q_EMIT currentPercentageWidthChanged();
     Q_EMIT currentWidthChanged();
 }
 
 qreal DelegateSizeHelper::startBreakpoint() const
 {
     return m_startBreakpoint;
 }
 
 void DelegateSizeHelper::setStartBreakpoint(qreal startBreakpoint)
 {
     if (startBreakpoint == m_startBreakpoint) {
         return;
     }
     m_startBreakpoint = startBreakpoint;
     Q_EMIT startBreakpointChanged();
 }
 
 qreal DelegateSizeHelper::endBreakpoint() const
 {
     return m_endBreakpoint;
 }
 
 void DelegateSizeHelper::setEndBreakpoint(qreal endBreakpoint)
 {
     if (endBreakpoint == m_endBreakpoint) {
         return;
     }
     m_endBreakpoint = endBreakpoint;
     Q_EMIT endBreakpointChanged();
 }
 
 int DelegateSizeHelper::startPercentWidth() const
 {
     return m_startPercentWidth;
 }
 
 void DelegateSizeHelper::setStartPercentWidth(int startPercentWidth)
 {
     if (startPercentWidth == m_startPercentWidth) {
         return;
     }
     m_startPercentWidth = startPercentWidth;
     Q_EMIT startPercentWidthChanged();
 }
 
 int DelegateSizeHelper::endPercentWidth() const
 {
     return m_endPercentWidth;
 }
 
 void DelegateSizeHelper::setEndPercentWidth(int endPercentWidth)
 {
     if (endPercentWidth == m_endPercentWidth) {
         return;
     }
     m_endPercentWidth = endPercentWidth;
     Q_EMIT endPercentWidthChanged();
 }
 
 qreal DelegateSizeHelper::maxWidth() const
 {
     return m_maxWidth;
 }
 
 void DelegateSizeHelper::setMaxWidth(qreal maxWidth)
 {
     if (maxWidth == m_maxWidth) {
         return;
     }
     m_maxWidth = maxWidth;
     Q_EMIT maxWidthChanged();
 }
 
 int DelegateSizeHelper::calculateCurrentPercentageWidth() const
 {
     // Don't do anything if m_parentWidth hasn't been set yet.
     if (m_parentWidth < 0) {
         return -1;
     }
     // Don't bother with calculations for a horizontal line.
     if (m_startPercentWidth == m_endPercentWidth) {
         return m_startPercentWidth;
     }
     // Dividing by zero is a bad idea.
     if (m_startBreakpoint == m_endBreakpoint) {
         qWarning() << "DelegateSizeHelper::calculateCurrentPercentageWidth() - m_startBreakpoint is equal to m_endBreakpoint this would lead to divide by "
                       "zero, aborting";
         return -1;
     }
 
     // Fit to y = mx + c
     qreal m = (m_endPercentWidth - m_startPercentWidth) / (m_endBreakpoint - m_startBreakpoint);
     qreal c = m_startPercentWidth - m * m_startBreakpoint;
 
     // This allows us to clamp correctly if the start or end width is bigger.
     bool endPercentBigger = m_endPercentWidth > m_startPercentWidth;
     int maxPercentWidth = endPercentBigger ? m_endPercentWidth : m_startPercentWidth;
     int minPercentWidth = endPercentBigger ? m_startPercentWidth : m_endPercentWidth;
 
     int calcPercentWidth = std::ceil(m * m_parentWidth + c);
     return std::clamp(calcPercentWidth, minPercentWidth, maxPercentWidth);
 }
 
 int DelegateSizeHelper::currentPercentageWidth() const
 {
     return calculateCurrentPercentageWidth();
 }
 
 qreal DelegateSizeHelper::currentWidth() const
 {
     if (m_parentWidth < 0) {
         return 0.0;
     }
     int percentWidth = calculateCurrentPercentageWidth();
     // - 1 means bad input values so don't try to calculate.
     if (percentWidth == -1) {
         return 0.0;
     }
 
     qreal absoluteWidth = m_parentWidth * percentWidth * 0.01;
     if (m_maxWidth < 0.0) {
         return std::ceil(absoluteWidth);
     } else {
         return std::ceil(std::min(absoluteWidth, m_maxWidth));
     }
 }
 
 #include "moc_delegatesizehelper.cpp"