103 lines
3 KiB
C++
103 lines
3 KiB
C++
#pragma once
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#ifndef FREE_LAYOUT_H
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#define FREE_LAYOUT_H
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// TnzCore includes
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#include "tcommon.h"
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// Qt includes
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#include <QList>
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#include <QLayout>
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#include <QWidget>
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#undef DVAPI
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#undef DVVAR
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#ifdef TOONZQT_EXPORTS
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#define DVAPI DV_EXPORT_API
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#define DVVAR DV_EXPORT_VAR
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#else
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#define DVAPI DV_IMPORT_API
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#define DVVAR DV_IMPORT_VAR
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#endif
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//************************************************************************************
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// DummyLayout declaration
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//************************************************************************************
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/*!
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\brief The DummyLayout class implements a layout whose items' geometry is
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not
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enforced at all, ignoring parent size bounds or geometry.
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\details A DummyLayout serves as a simple, inert container of layout items.
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It does not enforce geometry to items added to it, allowing objects
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using this layout to appear as a 'viewport' for free-geometry items.
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\note As this layout does not effectively manage its objects' geometry,
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these
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must be managed outside.
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*/
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class DVAPI DummyLayout : public QLayout {
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public:
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DummyLayout();
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virtual ~DummyLayout();
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QSize sizeHint() const override;
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QSize minimumSize() const override { return QSize(0, 0); }
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QSize maximumSize() const override {
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return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
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}
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int count() const override { return m_items.count(); }
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void addItem(QLayoutItem *item) override { m_items.push_back(item); }
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QLayoutItem *itemAt(int index) const override {
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return (index < count()) ? m_items.at(index) : 0;
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}
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QLayoutItem *takeAt(int index) override {
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return (index < count()) ? m_items.takeAt(index) : 0;
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}
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void setGeometry(const QRect &r) override {}
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// Qt::Orientations expandingDirections () const { return
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// Qt::Orientations(); }
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protected:
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QList<QLayoutItem *> m_items;
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};
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//************************************************************************************
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// FreeLayout declaration
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//************************************************************************************
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/*!
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\brief The FreeLayout class implements a layout whose items can be freely
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positioned, ignoring parent size bounds or geometry.
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\details A FreeLayout instance can be used to achieve results similar to that
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of a QScrollArea, with a more straightforward API and without
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restriction
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to just one item at a time. Please observe that layouts can be
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inserted too.
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Specifically, FreeLayout is a convenience subclass of DummyLayout
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whose items'
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sizes are enforced to their sizeHint() - in order to spare users
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from having to deal
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with it externally. This complies with the idea that its items are
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comfortly
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free to adapt to their preferred size, as it would be in a
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scrollable environment.
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*/
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class FreeLayout final : public DummyLayout {
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public:
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FreeLayout() : DummyLayout() {}
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~FreeLayout() {}
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void setGeometry(const QRect &r) override;
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};
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#endif // FREE_LAYOUT_H
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