From 0e1edcc58836b8f717ee33398b10b6a0d2e991a2 Mon Sep 17 00:00:00 2001
From: Linloir <3145078758@qq.com>
Date: Fri, 16 Dec 2022 21:45:11 +0800
Subject: [PATCH] [UI][ADD] Scroll List widget - transplanted from previous
 work

---
 FinalProject/scrolllist.cpp       |   0
 FinalProject/scrolllist.h         |   1 -
 FinalProject/scrolllistwidget.cpp | 422 ++++++++++++++++++++++++++++++
 FinalProject/scrolllistwidget.h   | 142 ++++++++++
 4 files changed, 564 insertions(+), 1 deletion(-)
 delete mode 100644 FinalProject/scrolllist.cpp
 delete mode 100644 FinalProject/scrolllist.h
 create mode 100644 FinalProject/scrolllistwidget.cpp
 create mode 100644 FinalProject/scrolllistwidget.h

diff --git a/FinalProject/scrolllist.cpp b/FinalProject/scrolllist.cpp
deleted file mode 100644
index e69de29..0000000
diff --git a/FinalProject/scrolllist.h b/FinalProject/scrolllist.h
deleted file mode 100644
index 6f70f09..0000000
--- a/FinalProject/scrolllist.h
+++ /dev/null
@@ -1 +0,0 @@
-#pragma once
diff --git a/FinalProject/scrolllistwidget.cpp b/FinalProject/scrolllistwidget.cpp
new file mode 100644
index 0000000..6d12181
--- /dev/null
+++ b/FinalProject/scrolllistwidget.cpp
@@ -0,0 +1,422 @@
+#include "scrolllistwidget.h"
+
+ScrollListWidget::ScrollListWidget(QWidget* parent) : QWidget(parent)
+{
+    //initialize list container and timer
+    container = new ScrollListContainer(this);
+    container->move(0, 0);
+    container->resize(this->width(), 3);
+    getCord = new QTimer;
+    getCord->setSingleShot(true);
+    rfrshView = new QTimer;
+    getCord->setSingleShot(true);
+
+    indicator = new ScrollListIndicator(this);
+    indicator->resize(indicator->width(), (int)((double)this->height() * this->height() / (double)container->height()));
+    indicator->move(this->width() - indicator->width() - 3, 0);
+
+    this->setMouseTracking(true);
+    container->setMouseTracking(true);
+    indicator->setMouseTracking(true);
+
+    bounce = new QPropertyAnimation(container, "pos");
+
+    QObject::connect(getCord, SIGNAL(timeout()), this, SLOT(updateSpd()));
+    QObject::connect(rfrshView, SIGNAL(timeout()), this, SLOT(scrollContainer()));
+    QObject::connect(indicator, SIGNAL(scrollPage(int)), this, SLOT(scrollIndicator(int)));
+}
+
+void ScrollListWidget::paintEvent(QPaintEvent* event) {
+    container->resize(this->width(), container->height());
+    if (container->height() > this->height() && container->y() < this->height() - container->height() && curSpd == 0 && bounce->state() == QAbstractAnimation::Stopped)
+        container->move(container->x(), this->height() - container->height());
+    if (container->height() <= this->height()) {
+        container->move(container->x(), 0);
+        indicator->hide();
+    }
+    else {
+        indicator->show();
+    }
+    indicator->resize(indicator->width(), (int)((double)this->height() * this->height() / (double)container->height()));
+    indicator->move(this->width() - indicator->width() - 3, -container->y() * this->height() / container->height());
+}
+
+void ScrollListWidget::mousePressEvent(QMouseEvent* event) {
+    if (container->height() > this->height()) {
+        if (container->y() <= 0 && container->y() + container->height() >= this->height())
+            pressed = true;
+        lastY = event->pos().y();
+    }
+    getCord->stop();
+    rfrshView->stop();
+    curSpd = 0;
+    outOfEdge = false;
+    moveStored = 0;
+    nextMove = 1;
+}
+
+void ScrollListWidget::mouseMoveEvent(QMouseEvent* event) {
+    setCursor(Qt::ArrowCursor);
+    if (pressed) {
+        //start scroll
+        if (!getCord->isActive() && event->pos().y() - lastY != 0) {
+            //start 30ms timer
+            getCord->start(30);
+            strtY = event->pos().y();
+        }
+        if (container->y() <= 0 && container->y() + container->height() >= this->height())
+            container->move(container->x(), container->y() + event->pos().y() - lastY);
+        else {
+            if (!outOfEdge) {
+                bfEdgeY = event->pos().y();
+                container->move(container->x(), container->y() + event->pos().y() - lastY);
+                outOfEdge = true;
+            }
+            else {
+                int pos = container->y() >= 0 ? 1 : -1;
+                int dp = event->pos().y() - bfEdgeY;
+                if (dp == 0) {
+                    outOfEdge = false;
+                    nextMove = 1;
+                    moveStored = 0;
+                    if (container->y() >= 0)
+                        container->move(container->x(), 0);
+                    else
+                        container->move(container->x(), this->height() - container->height());
+                }
+                else if (dp / abs(dp) != pos) {
+                    outOfEdge = false;
+                    container->move(container->x(), this->y() + event->pos().y() - bfEdgeY);
+                    nextMove = 1;
+                    moveStored = 0;
+                }
+                else {
+                    while (abs(moveStored) + nextMove <= abs(event->pos().y() - bfEdgeY)) {
+                        moveStored += nextMove * pos;
+                        container->move(container->x(), container->y() + pos);
+                        nextMove++;
+                    }
+                    while (nextMove > 1 && abs(moveStored) > abs(event->pos().y() - bfEdgeY)) {
+                        nextMove--;
+                        moveStored -= nextMove * pos;
+                        container->move(container->x(), container->y() - pos);
+                    }
+                    if (moveStored == 0) {
+                        outOfEdge = false;
+                        if (container->y() >= 0)
+                            container->move(container->x(), 0);
+                        else
+                            container->move(container->x(), this->height() - container->height());
+                        nextMove = 1;
+                        moveStored = 0;
+                    }
+                }
+            }
+        }
+        lastY = event->pos().y();
+    }
+}
+
+void ScrollListWidget::mouseReleaseEvent(QMouseEvent* event) {
+    //start scrolling
+    if (container->y() > 0 || container->y() + container->height() < this->height())
+        bounceBack();
+    else
+        rfrshView->start(30);
+    pressed = false;
+}
+
+void ScrollListWidget::bounceBack() {
+    rfrshView->stop();
+    getCord->stop();
+    bounce->setDuration(500);
+    bounce->setStartValue(container->pos());
+    if (container->y() > 0)
+        bounce->setEndValue(QPoint(container->x(), 0));
+    else
+        bounce->setEndValue(QPoint(container->x(), this->height() - container->height()));
+    bounce->setEasingCurve(QEasingCurve::OutQuad);
+    bounce->start();
+}
+
+void ScrollListWidget::scrollContainer() {
+    //scroll
+    if (curSpd > 0) {
+        if (curSpd > MAXSPEED && !ignoreMaxSpeed)
+            curSpd = MAXSPEED;
+        else if (curSpd <= MAXSPEED) ignoreMaxSpeed = false;
+        int dp = scrollDown ? curSpd : -curSpd;
+        container->move(container->x(), container->y() + dp);
+    }
+    else
+        return;
+    if (container->y() <= 0 && container->y() + container->height() >= this->height()) {
+        curSpd -= damp;
+        curSpd = curSpd < 0 ? 0 : curSpd;
+    }
+    else
+        curSpd /= 2;
+    if (curSpd == 0 && (container->y() > 0 || container->y() + container->height() < this->height()))
+        bounceBack();
+    else
+        rfrshView->start(30);
+}
+
+void ScrollListWidget::updateSpd() {
+    int spd = lastY - strtY;
+    scrollDown = spd >= 0;
+    strtY = lastY;
+    curSpd = abs(spd);
+}
+
+void ScrollListWidget::addWidget(QWidget* newWidget, bool setAnimation) {
+    newWidget->setParent(container);
+    container->AddWidget(newWidget, setAnimation);
+}
+
+void ScrollListWidget::removeWidget(QWidget* w) {
+    container->RemoveWidget(w);
+}
+
+void ScrollListWidget::scrollToTop() {
+    curSpd = sqrt(8 * (-container->pos().y()) + 2) / 2;
+    scrollDown = true;
+    getCord->stop();
+    rfrshView->stop();
+    outOfEdge = false;
+    moveStored = 0;
+    nextMove = 1;
+    ignoreMaxSpeed = true;
+    rfrshView->start(30);
+}
+
+void ScrollListWidget::updateHeight() {
+    container->updateHeight();
+}
+
+void ScrollListWidget::clear() {
+    container->clear();
+}
+
+void ScrollListWidget::scrollIndicator(int dp) {
+    int newY = container->y() - dp * container->height() / this->height();
+    if (newY > 0)
+        newY = 0;
+    else if (newY < this->height() - container->height())
+        newY = this->height() - container->height();
+    container->move(container->x(), newY);
+    update();
+}
+
+void ScrollListWidget::wheelEvent(QWheelEvent* event) {
+    if (container->y() > 0 || container->y() + container->height() < this->height())
+        return;
+    curSpd += 5;
+    bool newDirection = event->angleDelta().y() > 0;
+    if (newDirection != scrollDown)
+        curSpd = 5;
+    if (curSpd > MAXSPEED)
+        curSpd = MAXSPEED;
+    scrollDown = newDirection;
+    if (!rfrshView->isActive())
+        rfrshView->start(30);
+    update();
+}
+
+ScrollListContainer::ScrollListContainer(QWidget* parent) : QWidget(parent) {}
+
+void ScrollListContainer::paintEvent(QPaintEvent* event) {
+    for (int i = 0; i < widgets.size(); i++) {
+        widgets[i]->resize(this->width(), widgets[i]->height());
+    }
+}
+
+void ScrollListContainer::AddWidget(QWidget* widget, bool setAnimation) {
+    //Add animation for all widgets current
+    this->resize(this->width(), this->height() + widget->height() + spacing);
+    widgets.push_back(widget);
+    size++;
+    ys.push_back(0);
+    widget->resize(this->width(), widget->height());
+    widget->show();
+
+    if (setAnimation) {
+        QGraphicsOpacityEffect* widgetOpac = new QGraphicsOpacityEffect(widget);
+        widgetOpac->setOpacity(0);
+        widget->setGraphicsEffect(widgetOpac);
+        QParallelAnimationGroup* dpGroup = new QParallelAnimationGroup;
+        QSequentialAnimationGroup* newWidgetFadeIn = new QSequentialAnimationGroup;
+        for (int i = 0; i < size - 1; i++) {
+            ys[i] += widget->height() + spacing;
+            QPropertyAnimation* move = new QPropertyAnimation(widgets[i], "pos");
+            move->setDuration(750);
+            move->setStartValue(widgets[i]->pos());
+            move->setEndValue(QPoint(widgets[i]->x(), ys[i]));
+            move->setEasingCurve(QEasingCurve::InOutQuart);
+            dpGroup->addAnimation(move);
+        }
+        newWidgetFadeIn->addPause(300);
+        QPropertyAnimation* fade = new QPropertyAnimation(widgetOpac, "opacity", widget);
+        fade->setDuration(300);
+        fade->setStartValue(0);
+        fade->setEndValue(0.99);
+        newWidgetFadeIn->addAnimation(fade);
+        dpGroup->addAnimation(newWidgetFadeIn);
+        dpGroup->start();
+        connect(dpGroup, &QPropertyAnimation::stateChanged, [=]() {
+            if (dpGroup->state() == QAbstractAnimation::Stopped) {
+                if (widgetOpac->opacity() != 0.99) {
+                    fade->start(QAbstractAnimation::DeleteWhenStopped);
+                    connect(fade, &QPropertyAnimation::finished, [=]() {widgetOpac->deleteLater(); });
+                }
+                else {
+                    dpGroup->deleteLater();
+                    widgetOpac->deleteLater();
+                }
+            }
+            });
+    }
+    else {
+        for (int i = 0; i < size - 1; i++) {
+            ys[i] += widget->height() + spacing;
+            widgets[i]->move(QPoint(widgets[i]->pos().x(), ys[i]));
+        }
+    }
+}
+
+void ScrollListContainer::RemoveWidget(QWidget* widget) {
+    int index;
+    if (widget == nullptr) {
+        index = size - 1;
+        if (index != -1)
+            widget = widgets[index];
+    }
+    else
+        index = widgets.indexOf(widget);
+    if (index == -1 || widget == nullptr) {
+        return;
+    }
+    this->resize(this->width(), this->height() - widget->height() - spacing);
+    this->parentWidget()->update();
+    widget->hide();
+    widget->setParent(nullptr);
+    QParallelAnimationGroup* dpGroup = new QParallelAnimationGroup;
+    for (int i = index - 1; i >= 0; i--) {
+        ys[i] -= (widget->height() + spacing);
+        QPropertyAnimation* move = new QPropertyAnimation(widgets[i], "pos");
+        move->setDuration(750);
+        move->setStartValue(widgets[i]->pos());
+        move->setEndValue(QPoint(widgets[i]->x(), ys[i]));
+        move->setEasingCurve(QEasingCurve::InOutQuart);
+        dpGroup->addAnimation(move);
+    }
+    dpGroup->start(QAbstractAnimation::DeleteWhenStopped);
+    widgets.remove(index);
+    size--;
+    ys.remove(index);
+}
+
+void ScrollListContainer::updateHeight() {
+    for (int i = size - 2; i >= 0; i--) {
+        ys[i] = ys[i + 1] + widgets[i + 1]->height() + spacing;
+        widgets[i]->move(widgets[i]->pos().x(), ys[i]);
+    }
+    this->resize(this->width(), ys[0] + widgets[0]->height() + 3);
+}
+
+void ScrollListContainer::clear() {
+    int n = size;
+    for (int i = 0; i < n; i++)
+        RemoveWidget();
+}
+
+ScrollListIndicator::ScrollListIndicator(QWidget* parent) : QWidget(parent)
+{
+    this->resize(defaultWidth, 0);
+    hovTimer = new QTimer(this);
+    hovTimer->setSingleShot(true);
+    aniPause = new QTimer(this);
+    aniPause->setSingleShot(true);
+    QObject::connect(hovTimer, SIGNAL(timeout()), this, SLOT(setHoverActive()));
+    this->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+    this->curColor = defaultColor;
+
+    this->setMouseTracking(true);
+}
+
+void ScrollListIndicator::paintEvent(QPaintEvent* event) {
+    QPainter painter(this);
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(curColor);
+    painter.drawRect(this->rect());
+}
+
+void ScrollListIndicator::enterEvent(QEnterEvent* event) {
+    if (!pressed) {
+        hovTimer->start(100);
+        curColor = hoverColor;
+        update();
+    }
+}
+
+void ScrollListIndicator::leaveEvent(QEvent* event) {
+    hovTimer->stop();
+    curColor = defaultColor;
+    QPropertyAnimation* narrow = new QPropertyAnimation(this, "geometry");
+    narrow->setDuration(300);
+    narrow->setStartValue(QRect(this->x(), this->y(), this->width(), this->height()));
+    narrow->setEndValue(QRect(this->parentWidget()->width() - margin - defaultWidth, this->y(), defaultWidth, this->height()));
+    narrow->setEasingCurve(QEasingCurve::InOutQuad);
+    narrow->start(QAbstractAnimation::DeleteWhenStopped);
+    aniPause->start(300);
+    update();
+}
+
+void ScrollListIndicator::mousePressEvent(QMouseEvent* event) {
+    curColor = pressColor;
+    pressed = true;
+    //>note: globalPos -> globalPosition here due to deprecation
+    //>      may cause issues
+#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
+    lastY = event->globalPosition().y();
+#else
+    lastY = event->globalPos().y();
+#endif
+    update();
+}
+
+void ScrollListIndicator::mouseMoveEvent(QMouseEvent* event) {
+    if (pressed && !aniPause->isActive()) {
+        //>note: globalPos -> globalPosition here due to deprecation
+        //>      may cause issues
+#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
+        int dp = event->globalPosition().y() - lastY;
+#else
+        int dp = event->globalPos().y() - lastY;
+#endif
+        emit scrollPage(dp);
+        //>note: globalPos -> globalPosition here due to deprecation
+        //>      may cause issues
+#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
+        lastY = event->globalPosition().y();
+#else
+        lastY = event->globalPos().y();
+#endif
+    }
+}
+
+void ScrollListIndicator::mouseReleaseEvent(QMouseEvent* event) {
+    pressed = false;
+    curColor = hoverColor;
+    update();
+}
+
+void ScrollListIndicator::setHoverActive() {
+    QPropertyAnimation* widen = new QPropertyAnimation(this, "geometry");
+    widen->setDuration(300);
+    widen->setStartValue(QRect(this->x(), this->y(), this->width(), this->height()));
+    widen->setEndValue(QRect(this->parentWidget()->width() - margin - defaultWidthAtFocus, this->y(), defaultWidthAtFocus, this->height()));
+    widen->setEasingCurve(QEasingCurve::InOutQuad);
+    widen->start(QAbstractAnimation::DeleteWhenStopped);
+    aniPause->start(300);
+}
diff --git a/FinalProject/scrolllistwidget.h b/FinalProject/scrolllistwidget.h
new file mode 100644
index 0000000..4ace7a1
--- /dev/null
+++ b/FinalProject/scrolllistwidget.h
@@ -0,0 +1,142 @@
+/* This Module has not yet been rewritten */
+/* Behavior and performance is not guaranteed*/
+/* @Linloir */
+
+#pragma once
+
+#include <qwidget.h>
+#include <qboxlayout.h>
+#include <qpainter.h>
+#include <qpropertyanimation.h>
+#include <qparallelanimationgroup.h>
+#include <qsequentialanimationgroup.h>
+#include <qgraphicseffect.h>
+#include <qvector.h>
+#include <qevent.h>
+#include <qtimer.h>
+#include <qmath.h>
+
+#define MAXSPEED 70
+
+class ScrollListWidget;
+class ScrollListContainer;
+class ScrollListIndicator;
+
+class ScrollListWidget : public QWidget
+{
+    Q_OBJECT
+
+private:
+    QTimer* getCord;
+    QTimer* rfrshView;
+
+    ScrollListContainer* container;
+    ScrollListIndicator* indicator;
+
+    QPropertyAnimation* bounce;
+
+    bool pressed = false;
+    bool scrollDown = true;
+    bool outOfEdge = false;
+    bool ignoreMaxSpeed = false;
+
+    int strtY;
+    int lastY;
+    int bfEdgeY;    //last y value before out of edge
+
+    int curSpd = 0;
+    int damp = 1;
+    int moveStored = 0;
+    int nextMove = 1;
+
+    void paintEvent(QPaintEvent* event);
+    void mousePressEvent(QMouseEvent* event);
+    void mouseMoveEvent(QMouseEvent* event);
+    void mouseReleaseEvent(QMouseEvent* event);
+    void wheelEvent(QWheelEvent* event);
+    void bounceBack();
+
+
+public:
+    explicit ScrollListWidget(QWidget* parent = nullptr);
+    void addWidget(QWidget* newWidget, bool setAnimation = true);
+    void addWidgets(QVector<QWidget*> widgets) { for (int i = 0; i < widgets.size(); i++)addWidget(widgets[i], false); }
+    void removeWidget(QWidget* w = nullptr);
+    void scrollToTop();
+    void updateHeight();
+    void clear();
+
+signals:
+
+private slots:
+    void scrollContainer();
+    void updateSpd();
+    void scrollIndicator(int dp);
+
+};
+
+class ScrollListContainer : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit ScrollListContainer(QWidget* parent = nullptr);
+    void AddWidget(QWidget* widget, bool setAnimation = true);
+    void RemoveWidget(QWidget* widget = nullptr);
+    void updateHeight();
+    void clear();
+    //void RemoveWidget(QWidget* widget);
+
+private:
+    //QTimer* newWidgetFade;
+    int spacing = 3;
+    QVector<QWidget*> widgets;
+    int size = 0;
+    QVector<int> ys;
+
+    void paintEvent(QPaintEvent* event);
+
+signals:
+
+private slots:
+
+};
+
+class ScrollListIndicator : public QWidget
+{
+    Q_OBJECT
+
+private:
+    QColor curColor;
+    QColor defaultColor = QColor(100, 100, 100, 130);
+    QColor hoverColor = QColor(70, 70, 70, 150);
+    QColor pressColor = QColor(50, 50, 50, 170);
+
+    QTimer* hovTimer;
+    QTimer* aniPause;
+
+    int lastY;
+
+    int defaultWidth = 2;
+    int defaultWidthAtFocus = 9;
+    int margin = 3;
+
+    bool pressed = false;
+
+public:
+    explicit ScrollListIndicator(QWidget* parent = nullptr);
+
+private:
+    void paintEvent(QPaintEvent* event);
+    void enterEvent(QEnterEvent* event);
+    void leaveEvent(QEvent* event);
+    void mousePressEvent(QMouseEvent* event);
+    void mouseMoveEvent(QMouseEvent* event);
+    void mouseReleaseEvent(QMouseEvent* event);
+
+signals:
+    void scrollPage(int);
+
+private slots:
+    void setHoverActive();
+
+};