| 1 | /* |
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| 2 | * SPDX-FileCopyrightText: 2020 Carson Black <uhhadd@gmail.com> |
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| 3 | * |
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| 4 | * SPDX-License-Identifier: LGPL-2.0-or-later |
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| 5 | */ |
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| 6 | |
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| 7 | #pragma once |
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| 8 | |
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| 9 | #include <QMap> |
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| 10 | #include <QObject> |
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| 11 | #include <QPair> |
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| 12 | #include <QPointer> |
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| 13 | #include <QQmlListProperty> |
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| 14 | #include <QQmlParserStatus> |
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| 15 | #include <QQuickItem> |
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| 16 | |
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| 17 | /** |
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| 18 | * SizeGroup is a utility object that makes groups of items request the same size. |
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| 19 | */ |
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| 20 | class SizeGroup : public QObject, public QQmlParserStatus |
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| 21 | { |
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| 22 | Q_OBJECT |
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| 23 | QML_ELEMENT |
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| 24 | Q_INTERFACES(QQmlParserStatus) |
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| 25 | |
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| 26 | public: |
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| 27 | enum Mode { |
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| 28 | None = 0, /// SizeGroup does nothing |
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| 29 | Width = 1, /// SizeGroup syncs item widths |
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| 30 | Height = 2, /// SizeGroup syncs item heights |
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| 31 | Both = 3, /// SizeGroup syncs both item widths and heights |
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| 32 | }; |
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| 33 | Q_ENUM(Mode) |
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| 34 | Q_DECLARE_FLAGS(Modes, Mode) |
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| 35 | |
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| 36 | private: |
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| 37 | Mode m_mode = None; |
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| 38 | QList<QPointer<QQuickItem>> m_items; |
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| 39 | QMap<QQuickItem *, QPair<QMetaObject::Connection, QMetaObject::Connection>> m_connections; |
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| 40 | |
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| 41 | public: |
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| 42 | /** |
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| 43 | * Which dimensions this SizeGroup should adjust |
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| 44 | */ |
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| 45 | Q_PROPERTY(Mode mode MEMBER m_mode NOTIFY modeChanged FINAL) |
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| 46 | Q_SIGNAL void modeChanged(); |
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| 47 | |
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| 48 | /** |
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| 49 | * Which items this SizeGroup should adjust |
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| 50 | */ |
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| 51 | Q_PROPERTY(QQmlListProperty<QQuickItem> items READ items CONSTANT FINAL) |
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| 52 | QQmlListProperty<QQuickItem> items(); |
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| 53 | |
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| 54 | void adjustItems(Mode whatChanged); |
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| 55 | void connectItem(QQuickItem *item); |
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| 56 | |
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| 57 | /** |
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| 58 | * Forces the SizeGroup to relayout items. |
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| 59 | * |
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| 60 | * Normally this is never needed as the SizeGroup automatically |
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| 61 | * relayout items as they're added and their sizes change. |
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| 62 | */ |
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| 63 | Q_INVOKABLE void relayout(); |
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| 64 | |
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| 65 | void classBegin() override |
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| 66 | { |
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| 67 | } |
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| 68 | void componentComplete() override; |
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| 69 | |
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| 70 | private: |
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| 71 | static void appendItem(QQmlListProperty<QQuickItem> *prop, QQuickItem *value); |
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| 72 | static qsizetype itemCount(QQmlListProperty<QQuickItem> *prop); |
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| 73 | static QQuickItem *itemAt(QQmlListProperty<QQuickItem> *prop, qsizetype index); |
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| 74 | static void clearItems(QQmlListProperty<QQuickItem> *prop); |
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| 75 | }; |
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| 76 | |
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