DockingToolButton.cpp

/*
 * This file is part of DockingPanes. (https://github.com/KestrelRadarSensors/dockingpanes)
 *
 * (C) 2020 Kestrel Radar Sensors (https://www.kestrelradarsensors.com)
 *
 * DockingPanes is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * DockingPanes 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with DockingPanes.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <QDebug>
#include <QImage>
#include <QPainter>
#include <QPaintEvent>

#include "DockingToolButton.h"

DockingToolButton::DockingToolButton(DockingToolButton::ButtonType type, QWidget *parent) :
    QPushButton(parent)
{
    setMouseTracking(true);

    m_buttonType = type;
    m_highlight = false;
}

void DockingToolButton::enterEvent(QEvent* event)
{
    m_highlight = true;

    QPushButton::enterEvent(event);
}

void DockingToolButton::leaveEvent(QEvent* event)
{
    m_highlight = false;

    QPushButton::leaveEvent(event);
}

void DockingToolButton::paintEvent(QPaintEvent*)
{
    QImage buttonImage;
    QPainter p(this);

    int centreX = width()/2;
    int centreY = height()/2;

    p.setRenderHint(QPainter::Antialiasing, true);
    p.setRenderHint(QPainter::HighQualityAntialiasing, true);

    switch(m_buttonType) {
        case closeButtonInactive: {
             buttonImage.load(":/img/tool_button_bitmaps/close_inactive.png");
             break;
        }

        case closeButtonActive: {
             buttonImage.load(":/img/tool_button_bitmaps/close_active.png");
             break;
        }

        case pinButtonInactive: {
             buttonImage.load(":/img/tool_button_bitmaps/pin_inactive.png");
             break;
        }

        case pinButtonActive: {
             buttonImage.load(":/img/tool_button_bitmaps/pin_active.png");
             break;
        }

        case unpinButtonInactive: {
             buttonImage.load(":/img/tool_button_bitmaps/pin_inactive.png");
             buttonImage = buttonImage.transformed(QTransform().rotate(90));
             break;
        }

        case unpinButtonActive: {
             buttonImage.load(":/img/tool_button_bitmaps/pin_active.png");
             buttonImage = buttonImage.transformed(QTransform().rotate(90));
             break;
        }
    }

    p.drawImage(centreX-(buttonImage.width()/2), centreY-(buttonImage.height()/2), buttonImage);

    QRect rcHighlight;

    rcHighlight.setLeft(centreX-(buttonImage.width()/2)-2);
    rcHighlight.setRight(centreX+(buttonImage.width()/2)+2);

    rcHighlight.setTop(centreY-(buttonImage.height()/2)-2);
    rcHighlight.setBottom(centreY+(buttonImage.height()/2)+2);

    if (m_highlight) {
        p.fillRect(rcHighlight, QColor(0xFF, 0xFF, 0xFF, 0xAA));
    }
}

void DockingToolButton::setButton(DockingToolButton::ButtonType type)
{
    m_buttonType = type;
    update();
}