Import collapsible section

include/lib/collapsiblesection.h

@@ -0,0 +1,62 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef COLLAPSIBLESECTION_H
+#define COLLAPSIBLESECTION_H
+
+#include <QFrame>
+#include <QGridLayout>
+#include <QParallelAnimationGroup>
+#include <QScrollArea>
+#include <QToolButton>
+#include <QWidget>
+
+class CollapsibleSection : public QWidget
+{
+    Q_OBJECT
+    
+private:
+    QGridLayout* mainLayout;
+    QToolButton* toggleButton;
+    QFrame* headerLine;
+    QParallelAnimationGroup* toggleAnimation;
+    QScrollArea* contentArea;
+    int animationDuration;
+    int collapsedHeight;
+    bool isExpanded = false;
+    
+public slots:
+    void toggle(bool collapsed);
+
+public:
+    // initialize section
+    explicit CollapsibleSection(const QString& title = "", const int animationDuration = 0, QWidget* parent = 0);
+
+    // set layout of content
+    void setContentLayout(QLayout& contentLayout);
+    
+    // set title
+    void setTitle(QString title);
+    
+    // update animations and their heights
+    void updateHeights();
+};
+
+#endif // COLLAPSIBLESECTION_H

porymap.pro

@@ -45,6 +45,7 @@ SOURCES += src/core/block.cpp \
     src/lib/fex/lexer.cpp \
     src/lib/fex/parser.cpp \
     src/lib/fex/parser_util.cpp \
+    src/lib/collapsiblesection.cpp \
     src/lib/orderedjson.cpp \
     src/core/regionmapeditcommands.cpp \
     src/scriptapi/apimap.cpp \
@@ -151,6 +152,7 @@ HEADERS  += include/core/block.h \
     include/lib/fex/lexer.h \
     include/lib/fex/parser.h \
     include/lib/fex/parser_util.h \
+    include/lib/collapsiblesection.h \
     include/lib/orderedmap.h \
     include/lib/orderedjson.h \
     include/ui/aboutporymap.h \

src/lib/collapsiblesection.cpp

@@ -0,0 +1,109 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <QPropertyAnimation>
+
+#include "collapsiblesection.h"
+CollapsibleSection::CollapsibleSection(const QString& title, const int animationDuration, QWidget* parent)
+    : QWidget(parent), animationDuration(animationDuration)
+{
+    toggleButton = new QToolButton(this);
+    headerLine = new QFrame(this);
+    toggleAnimation = new QParallelAnimationGroup(this);
+    contentArea = new QScrollArea(this);
+    mainLayout = new QGridLayout(this);
+
+    toggleButton->setStyleSheet("QToolButton {border: none;}");
+    toggleButton->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
+    toggleButton->setArrowType(Qt::ArrowType::RightArrow);
+    toggleButton->setText(title);
+    toggleButton->setCheckable(true);
+    toggleButton->setChecked(false);
+
+    headerLine->setFrameShape(QFrame::HLine);
+    headerLine->setFrameShadow(QFrame::Sunken);
+    headerLine->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
+
+    contentArea->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
+
+    // start out collapsed
+    contentArea->setMaximumHeight(0);
+    contentArea->setMinimumHeight(0);
+
+    // let the entire widget grow and shrink with its content
+    toggleAnimation->addAnimation(new QPropertyAnimation(this, "maximumHeight"));
+    toggleAnimation->addAnimation(new QPropertyAnimation(this, "minimumHeight"));
+    toggleAnimation->addAnimation(new QPropertyAnimation(contentArea, "maximumHeight"));
+
+    mainLayout->setVerticalSpacing(0);
+    mainLayout->setContentsMargins(0, 0, 0, 0);
+
+    int row = 0;
+    mainLayout->addWidget(toggleButton, row, 0, 1, 1, Qt::AlignLeft);
+    mainLayout->addWidget(headerLine, row++, 2, 1, 1);
+    mainLayout->addWidget(contentArea, row, 0, 1, 3);
+    setLayout(mainLayout);
+
+    connect(toggleButton, &QToolButton::toggled, this, &CollapsibleSection::toggle);
+}
+
+void CollapsibleSection::toggle(bool expanded)
+{
+    toggleButton->setArrowType(expanded ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
+    toggleAnimation->setDirection(expanded ? QAbstractAnimation::Forward : QAbstractAnimation::Backward);
+    toggleAnimation->start();
+    
+    this->isExpanded = expanded;
+}
+
+void CollapsibleSection::setContentLayout(QLayout& contentLayout)
+{
+    delete contentArea->layout();
+    contentArea->setLayout(&contentLayout);
+    collapsedHeight = sizeHint().height() - contentArea->maximumHeight();
+    
+    updateHeights();
+}
+
+void CollapsibleSection::setTitle(QString title)
+{
+    toggleButton->setText(std::move(title));
+}
+
+void CollapsibleSection::updateHeights()
+{
+    int contentHeight = contentArea->layout()->sizeHint().height();
+
+    for (int i = 0; i < toggleAnimation->animationCount() - 1; ++i)
+    {
+        QPropertyAnimation* SectionAnimation = static_cast<QPropertyAnimation *>(toggleAnimation->animationAt(i));
+        SectionAnimation->setDuration(animationDuration);
+        SectionAnimation->setStartValue(collapsedHeight);
+        SectionAnimation->setEndValue(collapsedHeight + contentHeight);
+    }
+
+    QPropertyAnimation* contentAnimation = static_cast<QPropertyAnimation *>(toggleAnimation->animationAt(toggleAnimation->animationCount() - 1));
+    contentAnimation->setDuration(animationDuration);
+    contentAnimation->setStartValue(0);
+    contentAnimation->setEndValue(contentHeight);
+    
+    toggleAnimation->setDirection(isExpanded ? QAbstractAnimation::Forward : QAbstractAnimation::Backward);
+    toggleAnimation->start();
+}