more updates

CMakeLists.txt

@@ -6,7 +6,7 @@ set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
@@ -25,7 +25,7 @@ if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
         MANUAL_FINALIZATION
         ${PROJECT_SOURCES}
         tiercard.hpp tiercard.cpp
-        flowlayout.cpp flowlayout.h flowlayout.pro
+        flowlayout.cpp flowlayout.h
         tiercardlayout.hpp tiercardlayout.cpp
         aspectratiopixmaplabel.hpp aspectratiopixmaplabel.cpp
         fullsizelayout.hpp fullsizelayout.cpp
@@ -35,6 +35,8 @@ if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
         utils.hpp
         rowholder.hpp rowholder.cpp
         settings.hpp settings.cpp
+        invalididexception.hpp invalididexception.cpp
+        tierplaceholder.hpp tierplaceholder.cpp
 
     )
 # Define target properties for Android with Qt 6 as:

flowlayout.cpp

@@ -102,6 +102,8 @@ QSize FlowLayout::minimumSize() const
 
     const QMargins margins = contentsMargins();
     size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
+    if (size.height() < minimumHeight())
+        size.rheight() = minimumHeight();
     return size;
 }
 
@@ -143,12 +145,41 @@ int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
 int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
 {
     QObject* parent = this->parent();
-    if (!parent) {
+    if (!parent)
+    {
         return -1;
-    } else if (parent->isWidgetType()) {
+    }
+    else if (parent->isWidgetType())
+    {
         QWidget* pw = static_cast<QWidget*>(parent);
         return pw->style()->pixelMetric(pm, nullptr, pw);
-    } else {
+    }
+    else
+    {
         return static_cast<QLayout*>(parent)->spacing();
     }
 }
+
+void FlowLayout::setIndex(QWidget* wid, int index)
+{
+    if (itemAt(index)->widget() == wid)
+        return;
+    wid->setParent(nullptr);
+    addWidget(wid);
+    if (index < 0)
+        return;
+    for (int i = count()-1; i > index; i--)
+    {
+        itemList.swapItemsAt(i-1, i);
+    }
+}
+
+void FlowLayout::setMinimumHeight(int minh)
+{
+    _minimumHeight = minh;
+}
+
+int FlowLayout::minimumHeight() const
+{
+    return _minimumHeight;
+}

flowlayout.h

@@ -7,7 +7,7 @@
 #include <QLayout>
 #include <QRect>
 #include <QStyle>
-//! [0]
+
 class FlowLayout : public QLayout
 {
 public:
@@ -27,15 +27,17 @@ public:
     void setGeometry(const QRect &rect) override;
     QSize sizeHint() const override;
     QLayoutItem* takeAt(int index) override;
+    void setIndex(QWidget* wid, int index);
+    void setMinimumHeight(int minh);
+    int minimumHeight() const;
 
 private:
     int doLayout(const QRect &rect, bool testOnly) const;
     int smartSpacing(QStyle::PixelMetric pm) const;
-
+    int _minimumHeight = 0;
     QList<QLayoutItem*> itemList;
     int m_hSpace;
     int m_vSpace;
 };
-//! [0]
 
 #endif // FLOWLAYOUT_H

flowlayout.pro

@@ -1,11 +0,0 @@
-QT += widgets
-
-HEADERS     = flowlayout.h \
-              window.h
-SOURCES     = flowlayout.cpp \
-              main.cpp \
-              window.cpp
-
-# install
-target.path = $$[QT_INSTALL_EXAMPLES]/widgets/layouts/flowlayout
-INSTALLS += target

fullsizelayout.cpp

@@ -41,7 +41,7 @@ bool FullSizeLayout::hasHeightForWidth() const
 }
 int FullSizeLayout::heightForWidth(int width) const
 {
-    int h = -1;
+    int h = 0;
     for (auto child : itemList)
     {
         h = std::max(h, child->heightForWidth(width));
@@ -58,7 +58,7 @@ QLayoutItem* FullSizeLayout::itemAt(int index) const
 }
 QSize FullSizeLayout::minimumSize() const
 {
-    QSize size;
+    QSize size(0, 0);
     for (auto child : itemList)
     {
         // auto wid = child->widget();

invalididexception.cpp

@@ -0,0 +1,38 @@
+#include "invalididexception.hpp"
+
+InvalidIdException::InvalidIdException()
+{
+
+}
+
+InvalidRowIdException::InvalidRowIdException(TierRow::IdType id)
+    : _id(id), _what(std::format("id: {}", _id))
+{
+
+}
+
+TierRow::IdType InvalidRowIdException::id() const
+{
+    return _id;
+}
+
+const char* InvalidRowIdException::what() const noexcept
+{
+    return _what.c_str();
+}
+
+InvalidCardIdException::InvalidCardIdException(TierCard::IdType id)
+    : _id(id), _what(std::format("id: {}", _id))
+{
+
+}
+
+TierCard::IdType InvalidCardIdException::id() const
+{
+    return _id;
+}
+
+const char* InvalidCardIdException::what() const noexcept
+{
+    return _what.c_str();
+}

invalididexception.hpp

@@ -0,0 +1,39 @@
+#ifndef INVALIDIDEXCEPTION_HPP
+#define INVALIDIDEXCEPTION_HPP
+
+#include "tierrow.hpp"
+#include "tiercard.hpp"
+
+#include <QException>
+
+class InvalidIdException : public QException
+{
+public:
+    InvalidIdException();
+};
+
+class InvalidRowIdException : public InvalidIdException
+{
+public:
+    InvalidRowIdException(TierRow::IdType id);
+    TierRow::IdType id() const;
+    const char* what() const noexcept override;
+
+private:
+    const TierRow::IdType _id;
+    const std::string _what;
+};
+
+class InvalidCardIdException : public InvalidIdException
+{
+public:
+    InvalidCardIdException(TierCard::IdType id);
+    TierCard::IdType id() const;
+    const char* what() const noexcept override;
+
+private:
+    const TierCard::IdType _id;
+    const std::string _what;
+};
+
+#endif // INVALIDIDEXCEPTION_HPP

main.cpp

@@ -4,6 +4,7 @@
 #include "tiercardlayout.hpp"
 #include "utils.hpp"
 #include "rowholder.hpp"
+#include "settings.hpp"
 
 #include <QApplication>
 #include <QNetworkAccessManager>
@@ -56,8 +57,12 @@
 
 int main(int argc, char *argv[])
 {
+    auto settings = Settings::getSettable();
+    settings->setCardSize(150, 150);
+    settings->setRowFade(.8f);
     QApplication a(argc, argv);
     MainWindow w;
+    settings->setMainWindow(&w);
     // QDockWidget dock;
     QScrollArea scroll;
     TierRow* row = TierRow::create();
@@ -67,11 +72,9 @@ int main(int argc, char *argv[])
     row->setStyleSheet(makeBgColorString(QColor(35,35,35)));
     card1->setText("CARD1");
     card1->setBgColor(QColor(64,255,64));
-    card1->setFixedSize(150,150);
     TierCard* card2  = TierCard::create();
     card2->setText("CARD2");
     card2->setBgColor(QColor(64,64,255));
-    card2->setFixedSize(150,150);
     row->addCard(card1);
     row->addCard(card2);
 
@@ -81,13 +84,10 @@ int main(int argc, char *argv[])
     TierCard* card3 = TierCard::create();
     card3->setText("CARD1");
     card3->setBgColor(QColor(64,12,164));
-    card3->setFixedSize(150,150);
     TierCard* card4 = TierCard::create();
     card4->setText("CARD2");
     card4->setBgColor(QColor(164,64,155));
-    card4->setFixedSize(150,150);
     auto card5 = TierCard::clone(card4);
-    card5->setFixedSize(150,150);
     row->addCard(card5);
     row2->addCard(card3);
     row2->addCard(card4);
@@ -115,11 +115,12 @@ int main(int argc, char *argv[])
     // a.setFont()
     // QTimer bg_changer;
     // bg_changer.setTimerType(Qt::PreciseTimer);
-    // bg_changer.setSingleShot(false);
-    // bg_changer.setInterval(1000);
-    // QObject::connect(&bg_changer, &QTimer::timeout, [&row]()
+    // bg_changer.setSingleShot(true);
+    // bg_changer.setInterval(2000);
+    // QObject::connect(&bg_changer, &QTimer::timeout, [&settings]()
     // {
-    //     row.updateGeometry();
+    //     // row.updateGeometry();
+    //     settings->setCardSize(250,100);
     // });
     // bg_changer.start();
     // w.show();

settings.cpp

@@ -1,5 +1,59 @@
 #include "settings.hpp"
 
+#include <QMutexLocker>
+
 Settings::Settings(QObject *parent)
     : QObject{parent}
-{}
+{
+
+}
+
+const Settings* Settings::get()
+{
+    return getSettable();
+}
+
+Settings* Settings::getSettable()
+{
+    QMutexLocker locker(&lock);
+    if (!instance)
+        instance = new Settings();
+    return instance;
+}
+
+QSize Settings::cardSize() const
+{
+    return _cardSize;
+}
+
+void Settings::setCardSize(QSize newSize)
+{
+    _cardSize = newSize;
+    emit cardSizeChange(newSize);
+}
+
+void Settings::setCardSize(int w, int h)
+{
+    setCardSize(QSize(w, h));
+}
+
+void Settings::setMainWindow(QWidget* wid)
+{
+    _mainWindow = wid;
+}
+
+QWidget* Settings::mainWindow() const
+{
+    return _mainWindow;
+}
+
+void Settings::setRowFade(float fade)
+{
+    _rowFade = fade;
+    emit rowFadeChange(fade);
+}
+
+float Settings::rowFade() const
+{
+    return _rowFade;
+}

settings.hpp

@@ -2,14 +2,34 @@
 #define SETTINGS_HPP
 
 #include <QObject>
+#include <QMutex>
+#include <QRect>
 
 class Settings : public QObject
 {
     Q_OBJECT
 public:
+    static const Settings* get();
+    static Settings* getSettable();
+    QSize cardSize() const;
+    void setCardSize(QSize size);
+    void setCardSize(int w, int h);
+    QWidget* mainWindow() const;
+    void setMainWindow(QWidget* wid);
+    float rowFade() const;
+    void setRowFade(float trans);
+
+private:
     explicit Settings(QObject *parent = nullptr);
+    inline static Settings* instance;
+    inline static QMutex lock;
+    QSize _cardSize;
+    QWidget* _mainWindow = nullptr;
+    float _rowFade = 0;
 
 signals:
+    void cardSizeChange(QSize newSize);
+    void rowFadeChange(float newFade);
 };
 
 #endif // SETTINGS_HPP

tiercard.cpp

@@ -2,40 +2,10 @@
 #include "fullsizelayout.hpp"
 #include "qmimedata.h"
 #include "utils.hpp"
+#include "settings.hpp"
 
 #include <QVBoxLayout>
-
-// TierCard::TierCard(QWidget *parent)
-//     : QWidget{parent}
-// {
-//     auto bg_layout= new QVBoxLayout(this);
-//     bg_layout->setSpacing(0);
-//     bg_layout->setContentsMargins(0, 0, 0, 0);
-//     background = new QWidget();
-//     bg_layout->addWidget(background);
-//     auto img_layout = new QVBoxLayout(background);
-//     img_layout->setSpacing(0);
-//     img_layout->setContentsMargins(0, 0, 0, 0);
-//     image = new AspectRatioPixmapLabel();
-//     img_layout->addWidget(image, 0, Qt::AlignCenter);
-//     image->setAttribute(Qt::WA_TranslucentBackground);
-//     image->setAlignment(Qt::AlignCenter);
-//     auto txt_layout = new QVBoxLayout(image);
-//     txt_layout->setSpacing(0);
-//     txt_layout->setContentsMargins(0, 0, 0, 0);
-//     text_label = new QLabel();
-//     id_label = new QLabel("4");
-//     text_label->setWordWrap(true);
-//     // text_label->setTextFormat(Qt::RichText);
-//     text_label->setAlignment(Qt::AlignHCenter | Qt::AlignTop);
-//     id_label->setAlignment(Qt::AlignLeft | Qt::AlignBottom);
-//     text_label->setAttribute(Qt::WA_TranslucentBackground);
-//     id_label->setAttribute(Qt::WA_TranslucentBackground);
-//     txt_layout->addWidget(text_label, Qt::AlignTop | Qt::AlignHCenter);
-//     txt_layout->addWidget(id_label, Qt::AlignBottom, Qt::AlignLeft);
-//     text_label->setProperty("cssClass", "tierCardText");
-//     id_label->setProperty("cssClass", "tierCardId");
-// }
+#include <QDrag>
 
 TierCard::IdType TierCard::getAvailableId()
 {
@@ -72,6 +42,7 @@ TierCard* TierCard::clone(TierCard *other, QWidget* parent)
     card = new TierCard(id, parent);
     card->setText(other->getText());
     auto img = other->getImage();
+    if (!img.isNull())
         card->setImage(img);
     card->setBgColor(other->getBgColor());
     idMap[id] = card;
@@ -81,6 +52,9 @@ TierCard* TierCard::clone(TierCard *other, QWidget* parent)
 TierCard::TierCard(IdType id, QWidget* parent)
     : QWidget{parent}
 {
+    auto settings = Settings::get();
+    connect(settings, SIGNAL(cardSizeChange(QSize)),
+            this, SLOT(cardResize(QSize)));
     background = new QWidget();
     image = new AspectRatioPixmapLabel();
     image->setAttribute(Qt::WA_TranslucentBackground);
@@ -102,6 +76,7 @@ TierCard::TierCard(IdType id, QWidget* parent)
     layout->addWidget(textLabel);
     layout->addWidget(idLabel);
     this->setLayout(layout);
+    cardResize(settings->cardSize());
 }
 
 TierCard::~TierCard()
@@ -158,9 +133,11 @@ void TierCard::mousePressEvent(QMouseEvent* event)
     render(&pix);
     QDrag drag(this);
     drag.setPixmap(pix);
+    drag.setHotSpot(QPoint(pix.size().width() / 2,
+                           pix.size().height() / 2));
     QByteArray itemData;
     QDataStream dataStream(&itemData, QIODevice::WriteOnly);
-    auto _id = getId();
+    TierCard::IdType _id = getId();
     dataStream.writeRawData(reinterpret_cast<char*>(&_id), sizeof(_id));
     QMimeData *mimeData = new QMimeData;
     mimeData->setData(MimeType, itemData);
@@ -183,3 +160,8 @@ TierCard* TierCard::getFromId(IdType id)
         return nullptr;
     return &(*iter->second);
 }
+
+void TierCard::cardResize(QSize newSize)
+{
+    setFixedSize(newSize);
+}

tiercard.hpp

@@ -43,6 +43,9 @@ private:
     static void releaseId(IdType id);
     inline static std::unordered_map<IdType, TierCard*> idMap;
 
+public slots:
+    void cardResize(QSize newSize);
+
 signals:
 };
 

tierplaceholder.cpp

@@ -0,0 +1,24 @@
+#include "tierplaceholder.hpp"
+#include "settings.hpp"
+
+TierPlaceholder::TierPlaceholder(QWidget *parent)
+    : QWidget{parent}
+{
+    auto settings = Settings::get();
+    connect(settings, SIGNAL(cardSizeChange(QSize)),
+            this, SLOT(cardResize(QSize)));
+    QSizePolicy sp;
+    sp.setRetainSizeWhenHidden(true);
+    sp.setHorizontalPolicy(QSizePolicy::Fixed);
+    sp.setVerticalPolicy(QSizePolicy::Fixed);
+    setSizePolicy(sp);
+    //TODO potentially a race condition if card size is
+    //changed between settings->cardSize() being evaluated
+    //and cardResize() being called
+    cardResize(settings->cardSize());
+}
+
+void TierPlaceholder::cardResize(QSize newSize)
+{
+    setFixedSize(newSize);
+}

tierplaceholder.hpp

@@ -0,0 +1,18 @@
+#ifndef TIERPLACEHOLDER_HPP
+#define TIERPLACEHOLDER_HPP
+
+#include <QWidget>
+
+class TierPlaceholder : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit TierPlaceholder(QWidget *parent = nullptr);
+
+public slots:
+    void cardResize(QSize newSize);
+
+signals:
+};
+
+#endif // TIERPLACEHOLDER_HPP

tierrow.cpp

@@ -1,49 +1,44 @@
 #include "tierrow.hpp"
-#include "fullsizelayout.hpp"
+// #include "fullsizelayout.hpp"
 #include "qmimedata.h"
 #include "utils.hpp"
+#include "settings.hpp"
+#include "invalididexception.hpp"
 
 #include <QHBoxLayout>
 
 TierRow::TierRow(IdType id, QWidget *parent)
-    : QWidget{parent}
+    : QWidget{parent}, _id(id)
 {
+    auto settings = Settings::get();
     setAcceptDrops(true);
-    auto fadeLayout = new FullSizeLayout();
-    fadeLayout->setSizeConstraint(QLayout::SetMinimumSize);
-    fadeLayout->setContentsMargins(0, 0, 0, 0);
-    fadeLayout->setSpacing(0);
-    bgFadeContainer = new QWidget();
-    bgFadeContainer->setStyleSheet(makeBgColorString(QColor(255,255,255,100)));
-    bgFadeContainer->setMinimumSize(0, 0);
-    fadeLayout->addWidget(bgFadeContainer);
-    this->setLayout(fadeLayout);
     auto splitLayout = new QHBoxLayout();
     splitLayout->setSizeConstraint(QLayout::SetMinimumSize);
     splitLayout->setContentsMargins(0, 0, 0, 0);
     splitLayout->setSpacing(0);
+    this->setLayout(splitLayout);
     titleCard = new TierRowTitleCard(id);
     cardContainer = new QWidget();
-    cardContainer->setMinimumSize(0, 0);
-    titleCard->setFixedSize(150, 150);
     cardContainer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
     splitLayout->addWidget(titleCard, 0, Qt::AlignLeft | Qt::AlignTop);
     splitLayout->addWidget(cardContainer, 1, Qt::AlignTop);
 
-    cardContainer->setStyleSheet(makeBgColorString(QColor(60,60,60,100)));
-
-    bgFadeContainer->setLayout(splitLayout);
-    cardLayout = new FlowLayout();
+    // cardContainer->setStyleSheet(makeBgColorString(QColor(60,60,60,100)));
+    cardLayout = new FlowLayout(nullptr, 0, 0, 0);
     cardLayout->setSizeConstraint(QLayout::SetMinimumSize);
     cardLayout->setContentsMargins(0, 0, 0, 0);
     cardLayout->setSpacing(0);
     cardContainer->setLayout(cardLayout);
-    // setMinimumSize(0, 0);
+    connect(settings, SIGNAL(cardSizeChange(QSize)),
+            this, SLOT(cardResize(QSize)));
+    connect(settings, SIGNAL(rowFadeChange(float)),
+            this, SLOT(fadeChange(float)));
+    cardResize(settings->cardSize());
 }
 
 TierRow::~TierRow()
 {
-    qDebug() << "Row destructor called " << id();
+    // qDebug() << "Row destructor called " << id();
     if (idMap.erase(id()) == 0)
     {
         qDebug() << "Row id not found during destructor";
@@ -60,12 +55,20 @@ void TierRow::addCard(TierCard* card)
 // }
 void TierRow::setColor(QColor color)
 {
+    auto settings = Settings::get();
+    auto fade = settings->rowFade();
+    if (fade < 0)
+        fade = 0;
+    if (fade > 1)
+        fade = 1;
     _color = color;
+    const QColor wh(255,255,255);
     titleCard->setColor(color);
-    auto str = makeBgColorString(color);
+    auto fadedColor = blend(wh, color, fade);
+    auto str = makeBgColorString(fadedColor);
     setStyleSheet(str);
 }
-QColor TierRow::color()
+QColor TierRow::color() const
 {
     return _color;
 }
@@ -73,13 +76,13 @@ void TierRow::setText(QString text)
 {
     titleCard->setText(text);
 }
-QString TierRow::text()
+QString TierRow::text() const
 {
     return titleCard->text();
 }
-uint32_t TierRow::id()
+uint32_t TierRow::id() const
 {
-    return titleCard->id();
+    return _id;
 }
 
 void TierRow::resizeEvent(QResizeEvent* event)
@@ -90,7 +93,8 @@ void TierRow::resizeEvent(QResizeEvent* event)
 
 void TierRow::recalcMaxHeight()
 {
-    setMaximumHeight(cardLayout->totalMinimumHeightForWidth(cardContainer->width()));
+    setMaximumHeight(cardLayout->totalMinimumHeightForWidth(
+        cardContainer->width()));
 }
 
 TierRow* TierRow::create(QWidget* parent)
@@ -120,18 +124,22 @@ TierRow* TierRow::getFromId(IdType id)
 void TierRow::dropEvent(QDropEvent* event)
 {
     qDebug() << "drop event";
+    // auto source = event->source();
     //card dragged to this row
     if (event->mimeData()->hasFormat(TierCard::MimeType))
     {
         if (event->proposedAction() == Qt::MoveAction)
         {
+            clearPlaceholder();
             auto data = event->mimeData()->data(TierCard::MimeType);
             QDataStream stream(&data, QIODevice::ReadOnly);
             TierCard::IdType cardId;
-            uint dataLen = 0;
-            stream.readRawData(reinterpret_cast<char*>(&cardId), dataLen);
+            stream.readRawData(reinterpret_cast<char*>(&cardId), sizeof(cardId));
             auto card = TierCard::getFromId(cardId);
-            addCard(card);
+            if (!card)
+                throw InvalidCardIdException(cardId);
+            // addCard(card);
+            cardLayout->setIndex(card, calculateIndex(event->position()));
             event->acceptProposedAction();
         }
         else
@@ -149,10 +157,21 @@ void TierRow::dropEvent(QDropEvent *event)
 void TierRow::dragEnterEvent(QDragEnterEvent* event)
 {
     qDebug() << "drag enter event";
+    if (cardCount() == 0)
+    {
+        qDebug() << "enter empty";
+    }
     if (event->mimeData()->hasFormat(TierCard::MimeType))
     {
         if (event->proposedAction() == Qt::MoveAction)
         {
+            if (placeholder != nullptr)
+            {
+                qDebug() << "placeholder not previously cleared";
+                clearPlaceholder();
+            }
+            placeholder = new TierPlaceholder();
+            cardLayout->setIndex(placeholder, calculateIndex(event->position()));
             event->setDropAction(Qt::MoveAction);
             event->accept(cardContainer->rect());
         }
@@ -174,11 +193,16 @@ void TierRow::dragEnterEvent(QDragEnterEvent *event)
 
 void TierRow::dragMoveEvent(QDragMoveEvent* event)
 {
-    qDebug() << "drag move event";
     if (event->mimeData()->hasFormat(TierCard::MimeType))
     {
         if (event->proposedAction() == Qt::MoveAction)
         {
+            if (cardCount() == 1)
+            {
+                qDebug() << "moving in empty";
+            }
+            if (placeholder)
+                cardLayout->setIndex(placeholder, calculateIndex(event->position()));
             event->acceptProposedAction();
         }
         else
@@ -190,9 +214,62 @@ void TierRow::dragMoveEvent(QDragMoveEvent *event)
     else if (event->mimeData()->hasImage())
     {
         event->setDropAction(Qt::CopyAction);
-        event->accept();
+        //TODO event->accept();
+        event->ignore();
     }
-    else {
+    else
+    {
         event->ignore();
     }
 }
+
+void TierRow::dragLeaveEvent(QDragLeaveEvent* event)
+{
+    clearPlaceholder();
+}
+
+void TierRow::clearPlaceholder()
+{
+    placeholder->setParent(nullptr);
+    placeholder->deleteLater();
+    placeholder = nullptr;
+}
+
+int TierRow::calculateIndex(QPointF loc)
+{
+    auto settings = Settings::get();
+    auto cardSize = settings->cardSize();
+    auto cardCenter = loc + QPointF(cardSize.width() / 2,
+                                    cardSize.height() / 2);
+    auto lastBefore = 0;
+    for (int i = 0; i < cardLayout->count(); i++)
+    {
+        auto refCard = cardLayout->itemAt(i);
+        auto refPos = refCard->widget()->pos();
+        if (cardCenter.y() > refPos.y()
+            && cardCenter.x() > refPos.x())
+            lastBefore = i;
+        else
+            break;
+    }
+    return lastBefore;
+}
+
+void TierRow::cardResize(QSize newSize)
+{
+    titleCard->setFixedSize(newSize);
+    cardContainer->setMinimumHeight(newSize.height());
+    cardContainer->updateGeometry();
+    updateGeometry();
+    Settings::get()->mainWindow()->updateGeometry();
+}
+
+void TierRow::fadeChange(float newFade)
+{
+    setColor(_color);
+}
+
+int TierRow::cardCount() const
+{
+    return cardLayout->count();
+}

tierrow.hpp

@@ -4,10 +4,13 @@
 #include "tiercard.hpp"
 #include "tierrowtitlecard.hpp"
 #include "flowlayout.h"
+#include "tierplaceholder.hpp"
 
 #include <QWidget>
 #include <QDrag>
 
+#include <unordered_map>
+
 class TierRow : public QWidget
 {
     Q_OBJECT
@@ -18,31 +21,37 @@ public:
     ~TierRow();
     void addCard(TierCard* card);
     TierCard* takeCard(uint32_t id);
+    int cardCount() const;
     void setColor(QColor color);
-    QColor color();
+    QColor color() const;
     void setText(QString text);
-    QString text();
-    uint32_t id();
+    QString text() const;
+    uint32_t id() const;
 
 protected:
     void resizeEvent(QResizeEvent* event) override;
     // void mousePressEvent(QMouseEvent* event) override;
     void dropEvent(QDropEvent *event) override;
     void dragEnterEvent(QDragEnterEvent* event) override;
+    void dragLeaveEvent(QDragLeaveEvent* event) override;
     void dragMoveEvent(QDragMoveEvent* event) override;
 
 private:
     explicit TierRow(IdType id, QWidget* parent = nullptr);
     TierRowTitleCard* titleCard;
-    QWidget* bgFadeContainer;
     QWidget* cardContainer;
-    QLayout* cardLayout;
+    FlowLayout* cardLayout;
     QColor _color;
+    const IdType _id;
+    TierPlaceholder* placeholder = nullptr;
     void recalcMaxHeight();
+    void clearPlaceholder();
+    int calculateIndex(QPointF loc);
     inline static std::unordered_map<IdType, TierRow*> idMap;
 
 public slots:
-    void cardResize(QRect newSize);
+    void cardResize(QSize newSize);
+    void fadeChange(float newFade);
 
 signals:
 

tierrowtitlecard.cpp

@@ -5,7 +5,7 @@
 #include <QFrame>
 
 TierRowTitleCard::TierRowTitleCard(IdType id, QWidget *parent)
-    : QFrame{parent}
+    : QFrame{parent}, _id(id)
 {
     this->setFrameStyle(QFrame::Box | QFrame::Plain);
     auto layout = new FullSizeLayout();
@@ -38,5 +38,5 @@ void TierRowTitleCard::setColor(QColor color)
 
 uint32_t TierRowTitleCard::id() const
 {
-    return static_cast<uint32_t>(idLabel->text().toUInt());
+    return _id;
 }

tierrowtitlecard.hpp

@@ -20,6 +20,7 @@ private:
     QColor _color;
     QLabel* titleLabel;
     QLabel* idLabel;
+    const IdType _id;
 
 signals:
 };

utils.hpp

@@ -1,7 +1,7 @@
 #ifndef UTILS_HPP
 #define UTILS_HPP
 
-#include "tierrow.hpp"
+// #include "tierrow.hpp"
 
 #include <QWidget>
 #include <QString>
@@ -53,4 +53,15 @@ T* findParentOfType(QObject* obj)
     }
 }
 
+inline QColor blend(QColor first, QColor second, float portionFirst)
+{
+    const float& pf = portionFirst;
+    const float ps = 1 - pf;
+    return QColor(
+        first.red()*pf + second.red()*ps,
+        first.green()*pf + second.green()*ps,
+        first.blue()*pf + second.blue()*ps
+        );
+}
+
 #endif // UTILS_HPP