chore: baseline usable version

src/qEmbyApp/components/flowlayout.cpp

@@ -0,0 +1,225 @@
+#include "flowlayout.h"
+#include <QWidget>
+
+FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
+    : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
+{
+    setContentsMargins(margin, margin, margin, margin);
+}
+
+FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
+    : m_hSpace(hSpacing), m_vSpace(vSpacing)
+{
+    setContentsMargins(margin, margin, margin, margin);
+}
+
+FlowLayout::~FlowLayout()
+{
+    while (!itemList.isEmpty())
+        delete itemList.takeFirst();
+}
+
+void FlowLayout::addItem(QLayoutItem *item)
+{
+    itemList.append(item);
+    invalidate();
+}
+
+int FlowLayout::horizontalSpacing() const
+{
+    if (m_hSpace >= 0) {
+        return m_hSpace;
+    } else {
+        return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
+    }
+}
+
+int FlowLayout::verticalSpacing() const
+{
+    if (m_vSpace >= 0) {
+        return m_vSpace;
+    } else {
+        return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
+    }
+}
+
+int FlowLayout::count() const
+{
+    return itemList.size();
+}
+
+QLayoutItem *FlowLayout::itemAt(int index) const
+{
+    return itemList.value(index);
+}
+
+QLayoutItem *FlowLayout::takeAt(int index)
+{
+    if (index >= 0 && index < itemList.size()) {
+        QLayoutItem *item = itemList.takeAt(index);
+        invalidate();
+        return item;
+    }
+    return nullptr;
+}
+
+Qt::Orientations FlowLayout::expandingDirections() const
+{
+    return { };
+}
+
+bool FlowLayout::hasHeightForWidth() const
+{
+    return true;
+}
+
+int FlowLayout::heightForWidth(int width) const
+{
+    int height = doLayout(QRect(0, 0, width, 0), true);
+    return height;
+}
+
+void FlowLayout::invalidate()
+{
+    QLayout::invalidate();
+    updateParentGeometry();
+}
+
+void FlowLayout::setGeometry(const QRect &rect)
+{
+    QLayout::setGeometry(rect);
+    doLayout(rect, false);
+}
+
+void FlowLayout::setFirstLineTrailingSpacing(int spacing)
+{
+    const int safeSpacing = qMax(0, spacing);
+    if (m_firstLineTrailingSpacing == safeSpacing) {
+        return;
+    }
+
+    m_firstLineTrailingSpacing = safeSpacing;
+    invalidate();
+}
+
+int FlowLayout::firstLineTrailingSpacing() const
+{
+    return m_firstLineTrailingSpacing;
+}
+
+QSize FlowLayout::sizeHint() const
+{
+    QSize size = minimumSize();
+    int width = -1;
+
+    if (const auto *parentWidget = qobject_cast<const QWidget *>(parent())) {
+        width = parentWidget->contentsRect().width();
+        const QWidget *p = parentWidget->parentWidget();
+        while (width <= 0 && p) {
+            width = p->contentsRect().width();
+            p = p->parentWidget();
+        }
+    } else if (geometry().isValid()) {
+        width = geometry().width();
+    }
+
+    if (width > 0) {
+        size.setWidth(qMax(size.width(), width));
+        size.setHeight(heightForWidth(width));
+    }
+
+    return size;
+}
+
+QSize FlowLayout::minimumSize() const
+{
+    QSize size;
+    for (const QLayoutItem *item : itemList) {
+        if (const QWidget *wid = item->widget(); wid && wid->isHidden()) {
+            continue;
+        }
+        size = size.expandedTo(item->minimumSize());
+    }
+
+    const QMargins margins = contentsMargins();
+    size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
+    return size;
+}
+
+int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
+{
+    int left, top, right, bottom;
+    getContentsMargins(&left, &top, &right, &bottom);
+    QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
+    int x = effectiveRect.x();
+    int y = effectiveRect.y();
+    int lineHeight = 0;
+
+    for (QLayoutItem *item : itemList) {
+        const QWidget *wid = item->widget();
+        if (wid && wid->isHidden()) {
+            continue;
+        }
+        int spaceX = horizontalSpacing();
+        if (spaceX == -1) {
+            spaceX = wid ? wid->style()->layoutSpacing(
+                               QSizePolicy::PushButton,
+                               QSizePolicy::PushButton,
+                               Qt::Horizontal)
+                         : 0;
+        }
+        int spaceY = verticalSpacing();
+        if (spaceY == -1) {
+            spaceY = wid ? wid->style()->layoutSpacing(
+                               QSizePolicy::PushButton,
+                               QSizePolicy::PushButton,
+                               Qt::Vertical)
+                         : 0;
+        }
+
+        const int lineRight = (y == effectiveRect.y())
+                                  ? qMax(effectiveRect.x(),
+                                         effectiveRect.right() - m_firstLineTrailingSpacing)
+                                  : effectiveRect.right();
+        int nextX = x + item->sizeHint().width() + spaceX;
+        if (nextX - spaceX > lineRight && lineHeight > 0) {
+            x = effectiveRect.x();
+            y = y + lineHeight + spaceY;
+            nextX = x + item->sizeHint().width() + spaceX;
+            lineHeight = 0;
+        }
+
+        if (!testOnly)
+            item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
+
+        x = nextX;
+        lineHeight = qMax(lineHeight, item->sizeHint().height());
+    }
+    return y + lineHeight - rect.y() + bottom;
+}
+
+int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
+{
+    QObject *parent = this->parent();
+    if (!parent) {
+        return -1;
+    } else if (parent->isWidgetType()) {
+        QWidget *pw = static_cast<QWidget *>(parent);
+        return pw->style()->pixelMetric(pm, nullptr, pw);
+    } else {
+        return static_cast<QLayout *>(parent)->spacing();
+    }
+}
+
+void FlowLayout::updateParentGeometry() const
+{
+    auto *parentWidget = qobject_cast<QWidget *>(parent());
+    if (!parentWidget) {
+        return;
+    }
+
+    parentWidget->updateGeometry();
+    if (QWidget *outerWidget = parentWidget->parentWidget()) {
+        outerWidget->updateGeometry();
+    }
+}