slider.cpp

// SPDX-License-Identifier: LGPL-2.1-or-later OR BSD-3-Clause
// SPDX-FileCopyrightText: 2004 - 2008 Olof Naessén and Per Larsson
// SPDX-FileCopyrightText: 2013 - 2026 Fifengine contributors
 
// Corresponding header include
#include "fifechan/widgets/slider.hpp"
 
// Standard library includes
#include <algorithm>
 
// Project headers (subdirs before local)
#include "fifechan/graphics.hpp"
#include "fifechan/key.hpp"
#include "fifechan/mouseinput.hpp"
 
namespace fcn
{
    Slider::Slider(double scaleEnd) : Slider(0, scaleEnd)
    {
    }
 
    Slider::Slider(double scaleStart, double scaleEnd) : mScaleStart(scaleStart), mScaleEnd(scaleEnd)
    {
        setFocusable(true);
        setBorderSize(1);
        setOrientation(Orientation::Horizontal);
        setBackgroundColor(Color(220, 226, 237, 255));
        setBaseColor(Color(154, 169, 196, 255));
        setForegroundColor(Color(58, 72, 100, 255));
        setValue(scaleStart);
        setStepLength((scaleEnd - scaleStart) / 10);
        setMarkerLength(10);
 
        addMouseListener(this);
        addKeyListener(this);
    }
 
    void Slider::setScale(double scaleStart, double scaleEnd)
    {
        mScaleStart = scaleStart;
        mScaleEnd   = scaleEnd;
        mValue      = std::max(mScaleStart, mValue);
        mValue      = std::min(mScaleEnd, mValue);
    }
 
    double Slider::getScaleStart() const
    {
        return mScaleStart;
    }
 
    void Slider::setScaleStart(double scaleStart)
    {
        mScaleStart = scaleStart;
        mValue      = std::max(mScaleStart, mValue);
    }
 
    double Slider::getScaleEnd() const
    {
        return mScaleEnd;
    }
 
    void Slider::setScaleEnd(double scaleEnd)
    {
        mScaleEnd = scaleEnd;
        mValue    = std::min(mScaleEnd, mValue);
    }
 
    void Slider::draw(fcn::Graphics* graphics)
    {
        Color trackColor = getBackgroundColor() - Color(0x101010);
        int const alpha  = getBackgroundColor().a;
        trackColor.a     = alpha;
 
        graphics->setColor(trackColor);
        graphics->fillRectangle(0, 0, getWidth(), getHeight());
 
        drawMarker(graphics);
    }
 
    void Slider::drawMarker(fcn::Graphics* graphics)
    {
        fcn::Color const faceColor = getBaseColor();
        fcn::Color highlightColor;
        fcn::Color shadowColor;
        int const alpha  = getBaseColor().a;
        highlightColor   = faceColor + Color(0x303030);
        highlightColor.a = alpha;
        shadowColor      = faceColor - Color(0x303030);
        shadowColor.a    = alpha;
 
        graphics->setColor(faceColor);
 
        if (getOrientation() == Orientation::Horizontal) {
            int const v = getMarkerPosition();
            graphics->fillRectangle(v + 1, 1, getMarkerLength() - 2, getHeight() - 2);
            graphics->setColor(highlightColor);
            graphics->drawLine(v, 0, v + getMarkerLength() - 1, 0);
            graphics->drawLine(v, 0, v, getHeight() - 1);
            graphics->setColor(shadowColor);
            graphics->drawLine(v + getMarkerLength() - 1, 1, v + getMarkerLength() - 1, getHeight() - 1);
            graphics->drawLine(v + 1, getHeight() - 1, v + getMarkerLength() - 1, getHeight() - 1);
 
            if (isFocused()) {
                graphics->setColor(getForegroundColor());
                graphics->drawRectangle(v + 2, 2, getMarkerLength() - 4, getHeight() - 4);
            }
        } else {
            int const v = (getHeight() - getMarkerLength()) - getMarkerPosition();
            graphics->fillRectangle(1, v + 1, getWidth() - 2, getMarkerLength() - 2);
            graphics->setColor(highlightColor);
            graphics->drawLine(0, v, 0, v + getMarkerLength() - 1);
            graphics->drawLine(0, v, getWidth() - 1, v);
            graphics->setColor(shadowColor);
            graphics->drawLine(1, v + getMarkerLength() - 1, getWidth() - 1, v + getMarkerLength() - 1);
            graphics->drawLine(getWidth() - 1, v + 1, getWidth() - 1, v + getMarkerLength() - 1);
 
            if (isFocused()) {
                graphics->setColor(getForegroundColor());
                graphics->drawRectangle(2, v + 2, getWidth() - 4, getMarkerLength() - 4);
            }
        }
    }
 
    void Slider::mousePressed(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getButton() == fcn::MouseEvent::Button::Left && mouseEvent.getX() >= 0 &&
            mouseEvent.getX() <= getWidth() && mouseEvent.getY() >= 0 && mouseEvent.getY() <= getHeight()) {
            if (getOrientation() == Orientation::Horizontal) {
                setValue(markerPositionToValue(mouseEvent.getX() - (getMarkerLength() / 2)));
            } else {
                setValue(markerPositionToValue(getHeight() - mouseEvent.getY() - (getMarkerLength() / 2)));
            }
 
            distributeActionEvent();
        }
    }
 
    void Slider::mouseDragged(MouseEvent& mouseEvent)
    {
        if (getOrientation() == Orientation::Horizontal) {
            setValue(markerPositionToValue(mouseEvent.getX() - (getMarkerLength() / 2)));
        } else {
            setValue(markerPositionToValue(getHeight() - mouseEvent.getY() - (getMarkerLength() / 2)));
        }
 
        distributeActionEvent();
 
        mouseEvent.consume();
    }
 
    void Slider::setValue(double value)
    {
        if (value > getScaleEnd()) {
            mValue = getScaleEnd();
            return;
        }
 
        if (value < getScaleStart()) {
            mValue = getScaleStart();
            return;
        }
 
        mValue = value;
    }
 
    double Slider::getValue() const
    {
        return mValue;
    }
 
    int Slider::getMarkerLength() const
    {
        return mMarkerLength;
    }
 
    void Slider::setMarkerLength(int length)
    {
        mMarkerLength = length;
    }
 
    void Slider::keyPressed(KeyEvent& keyEvent)
    {
        Key const key = keyEvent.getKey();
 
        if (getOrientation() == Orientation::Horizontal) {
            if (key.getValue() == fcn::Key::RIGHT) {
                setValue(getValue() + getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            } else if (key.getValue() == fcn::Key::LEFT) {
                setValue(getValue() - getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            }
        } else {
            if (key.getValue() == fcn::Key::UP) {
                setValue(getValue() + getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            } else if (key.getValue() == fcn::Key::DOWN) {
                setValue(getValue() - getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            }
        }
    }
 
    void Slider::setOrientation(Slider::Orientation orientation)
    {
        mOrientation = orientation;
    }
 
    Slider::Orientation Slider::getOrientation() const
    {
        return mOrientation;
    }
 
    double Slider::markerPositionToValue(int position) const
    {
        int w = 0;
        if (getOrientation() == Orientation::Horizontal) {
            w = getWidth();
        } else {
            w = getHeight();
        }
 
        double const pos = position / (static_cast<double>(w) - getMarkerLength());
        return ((1.0 - pos) * getScaleStart()) + (pos * getScaleEnd());
    }
 
    int Slider::valueToMarkerPosition(double value) const
    {
        int v = 0;
        if (getOrientation() == Orientation::Horizontal) {
            v = getWidth();
        } else {
            v = getHeight();
        }
 
        int const w =
            static_cast<int>(((v - getMarkerLength()) * (value - getScaleStart()) / (getScaleEnd() - getScaleStart())));
 
        if (w < 0) {
            return 0;
        }
 
        if (w > v - getMarkerLength()) {
            return v - getMarkerLength();
        }
 
        return w;
    }
 
    void Slider::setStepLength(double length)
    {
        mStepLength = length;
    }
 
    double Slider::getStepLength() const
    {
        return mStepLength;
    }
 
    int Slider::getMarkerPosition() const
    {
        return valueToMarkerPosition(getValue());
    }
 
    void Slider::mouseWheelMovedUp(MouseEvent& mouseEvent)
    {
        if (getOrientation() == Orientation::Vertical) {
            setValue(getValue() + getStepLength());
            distributeActionEvent();
 
            mouseEvent.consume();
        }
    }
 
    void Slider::mouseWheelMovedDown(MouseEvent& mouseEvent)
    {
        if (getOrientation() == Orientation::Vertical) {
            setValue(getValue() - getStepLength());
            distributeActionEvent();
 
            mouseEvent.consume();
        }
    }
 
    void Slider::mouseWheelMovedRight(MouseEvent& mouseEvent)
    {
        if (getOrientation() == Orientation::Horizontal) {
            setValue(getValue() + getStepLength());
            distributeActionEvent();
 
            mouseEvent.consume();
        }
    }
 
    void Slider::mouseWheelMovedLeft(MouseEvent& mouseEvent)
    {
        if (getOrientation() == Orientation::Horizontal) {
            setValue(getValue() - getStepLength());
            distributeActionEvent();
 
            mouseEvent.consume();
        }
    }
} // namespace fcn