feat: add ButtonRow component

SHAPE MORPHHHHHHHHHHHHH

components/controls/ButtonBase.qml

@@ -21,6 +21,7 @@ StyledRect {
 
     property bool radiusMorph
     property alias shapeMorph: stateLayer.shapeMorph
+    property bool fillWidth // For ButtonRow
 
     property font font
     property int type: ButtonBase.Filled
@@ -42,6 +43,7 @@ StyledRect {
     property color disabledOnColour: Qt.alpha(Colours.palette.m3onSurface, 0.38)
 
     property bool internalChecked
+    property real shapeMorphExpansion: pressed ? 1.16 : 1
     readonly property color onColour: disabled ? disabledOnColour : internalChecked ? activeOnColour : inactiveOnColour
 
     signal clicked
@@ -82,4 +84,10 @@ StyledRect {
             type: Anim.DefaultEffects
         }
     }
+
+    Behavior on shapeMorphExpansion {
+        Anim {
+            type: Anim.FastSpatial
+        }
+    }
 }

plugin/src/Caelestia/Components/CMakeLists.txt

@@ -1,8 +1,9 @@
 qml_module(caelestia-components
     URI Caelestia.Components
     SOURCES
-        lazylistview.hpp lazylistview.cpp
-        wavyline.hpp wavyline.cpp
+        lazylistview.cpp
+        wavyline.cpp
+        buttonrow.cpp
     LIBRARIES
         Qt::Quick
 )

plugin/src/Caelestia/Components/buttonrow.cpp

@@ -0,0 +1,127 @@
+#include "buttonrow.hpp"
+
+namespace caelestia::components {
+
+ButtonRow::ButtonRow(QQuickItem* parent)
+    : QQuickItem(parent)
+    , m_dirty(false)
+    , m_spacing(0.0) {
+    setFlag(QQuickItem::ItemHasContents, true);
+    QObject::connect(this, &ButtonRow::widthChanged, this, &ButtonRow::invalidate);
+}
+
+qreal ButtonRow::spacing() const {
+    return m_spacing;
+}
+
+void ButtonRow::setSpacing(qreal spacing) {
+    if (qFuzzyCompare(m_spacing + 1.0, spacing + 1.0))
+        return;
+
+    m_spacing = spacing;
+    emit spacingChanged();
+
+    invalidate();
+}
+
+void ButtonRow::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData& data) {
+    if (change == QQuickItem::ItemChildAddedChange) {
+        auto* const child = data.item;
+        QObject::connect(child, &QQuickItem::implicitWidthChanged, this, &ButtonRow::invalidate);
+        QObject::connect(child, &QQuickItem::implicitHeightChanged, this, &ButtonRow::invalidate);
+        QObject::connect(child, &QQuickItem::visibleChanged, this, &ButtonRow::invalidate);
+
+        const auto* childMeta = child->metaObject();
+        const auto morphSignalIdx = childMeta->indexOfSignal("shapeMorphExpansionChanged()");
+        if (morphSignalIdx != -1)
+            QObject::connect(child, childMeta->method(morphSignalIdx), this,
+                metaObject()->method(metaObject()->indexOfSlot("invalidate()")));
+
+        invalidate();
+    } else if (change == QQuickItem::ItemChildRemovedChange) {
+        QObject::disconnect(data.item, nullptr, this, nullptr);
+        invalidate();
+    }
+
+    QQuickItem::itemChange(change, data);
+}
+
+void ButtonRow::updatePolish() {
+    if (m_dirty) {
+        relayout();
+        m_dirty = false;
+    }
+}
+
+void ButtonRow::invalidate() {
+    m_dirty = true;
+    polish();
+}
+
+void ButtonRow::relayout() {
+    const auto children = childItems();
+    const auto nChildren = children.size();
+    const auto totalSpacing = static_cast<qreal>(nChildren - 1) * m_spacing;
+
+    qreal reservedWidth = 0;
+    int fillWidthCount = 0;
+    qreal maxHeight = 0;
+    for (auto* const child : children) {
+        if (!child->isVisible())
+            continue;
+
+        maxHeight = qMax(maxHeight, child->implicitHeight());
+
+        const auto prop = child->property("fillWidth");
+        if (!prop.isValid())
+            continue;
+
+        if (prop.toBool())
+            fillWidthCount++;
+        else
+            reservedWidth += child->implicitWidth();
+    }
+
+    if (fillWidthCount == 0)
+        fillWidthCount = 1; // Avoid divide by 0
+
+    qreal accX = 0;
+    const auto widthPerItem = (width() - totalSpacing - reservedWidth) / static_cast<qreal>(fillWidthCount);
+    for (int i = 0; i < nChildren; ++i) {
+        auto* const child = children[i];
+        if (!child->isVisible())
+            continue;
+
+        auto prevExtraWidth = i > 0 ? getMorphExpansion(children[i - 1]) : 0.0;
+        auto nextExtraWidth = i < nChildren - 1 ? getMorphExpansion(children[i + 1]) : 0.0;
+
+        // Items at edges push by full amount, items in middle push by half
+        if (i > 1)
+            prevExtraWidth /= 2;
+        if (i < nChildren - 2)
+            nextExtraWidth /= 2;
+
+        const auto childWidth = child->property("fillWidth").toBool() ? widthPerItem : child->implicitWidth();
+
+        child->setWidth(childWidth + getMorphExpansion(child, childWidth) - prevExtraWidth - nextExtraWidth);
+        child->setHeight(maxHeight);
+
+        child->setX(accX);
+        child->setY(0);
+        accX += child->width() + m_spacing;
+    }
+
+    setImplicitWidth(reservedWidth + totalSpacing);
+    setImplicitHeight(maxHeight);
+}
+
+qreal ButtonRow::getMorphExpansion(const QQuickItem* item) {
+    return getMorphExpansion(item, item->implicitWidth());
+}
+
+qreal ButtonRow::getMorphExpansion(const QQuickItem* item, qreal width) {
+    const auto prop = item->property("shapeMorphExpansion");
+    return width * (prop.isValid() ? prop.toReal() - 1 : 0.0);
+}
+
+} // namespace caelestia::components

plugin/src/Caelestia/Components/buttonrow.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <qquickitem.h>
+
+namespace caelestia::components {
+
+class ButtonRow : public QQuickItem {
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(qreal spacing READ spacing WRITE setSpacing NOTIFY spacingChanged)
+
+public:
+    explicit ButtonRow(QQuickItem* parent = nullptr);
+
+    qreal spacing() const;
+    void setSpacing(qreal spacing);
+
+signals:
+    void spacingChanged();
+
+protected:
+    void itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData& data) override;
+    void updatePolish() override;
+
+private slots:
+    void invalidate();
+
+private:
+    void relayout();
+    static qreal getMorphExpansion(const QQuickItem* item);
+    static qreal getMorphExpansion(const QQuickItem* item, qreal width);
+
+    bool m_dirty;
+    qreal m_spacing;
+};
+
+} // namespace caelestia::components