113 lines
3.0 KiB
C++
113 lines
3.0 KiB
C++
/*
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* Copyright 2006-2010, Haiku, Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _LAYOUT_H
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#define _LAYOUT_H
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#include <Alignment.h>
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#include <Archivable.h>
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#include <LayoutItem.h>
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#include <List.h>
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#include <Size.h>
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class BLayoutContext;
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class BLayoutItem;
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class BView;
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class BLayout : public BLayoutItem {
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public:
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BLayout();
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BLayout(BMessage* archive);
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virtual ~BLayout();
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BView* Owner() const;
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BView* TargetView() const;
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virtual BView* View(); // from BLayoutItem
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// methods dealing with items
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virtual BLayoutItem* AddView(BView* child);
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virtual BLayoutItem* AddView(int32 index, BView* child);
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virtual bool AddItem(BLayoutItem* item);
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virtual bool AddItem(int32 index, BLayoutItem* item);
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virtual bool RemoveView(BView* child);
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virtual bool RemoveItem(BLayoutItem* item);
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virtual BLayoutItem* RemoveItem(int32 index);
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BLayoutItem* ItemAt(int32 index) const;
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int32 CountItems() const;
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int32 IndexOfItem(const BLayoutItem* item) const;
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int32 IndexOfView(BView* child) const;
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bool AncestorsVisible() const;
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// Layouting related methods
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virtual void InvalidateLayout(bool children = false);
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virtual void Relayout(bool immediate = false);
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void RequireLayout();
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bool IsValid();
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void EnableLayoutInvalidation();
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void DisableLayoutInvalidation();
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void LayoutItems(bool force = false);
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BRect LayoutArea();
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BLayoutContext* LayoutContext() const;
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// Archiving methods
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virtual status_t Archive(BMessage* into, bool deep = true) const;
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virtual status_t AllUnarchived(const BMessage* from);
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virtual status_t ItemArchived(BMessage* into, BLayoutItem* item,
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int32 index) const;
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virtual status_t ItemUnarchived(const BMessage* from,
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BLayoutItem* item, int32 index);
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protected:
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// BLayout hook methods
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virtual bool ItemAdded(BLayoutItem* item, int32 atIndex);
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virtual void ItemRemoved(BLayoutItem* item, int32 fromIndex);
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virtual void DerivedLayoutItems() = 0;
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virtual void OwnerChanged(BView* was);
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// BLayoutItem hook methods
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virtual void AttachedToLayout();
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virtual void DetachedFromLayout(BLayout* layout);
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virtual void AncestorVisibilityChanged(bool shown);
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// To be called by sub-classes in SetVisible().
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void VisibilityChanged(bool show);
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// To be called when layout data is known to be good
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void ResetLayoutInvalidation();
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private:
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friend class BView;
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bool RemoveViewRecursive(BView* view);
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bool InvalidateLayoutsForView(BView* view);
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bool InvalidationLegal();
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void SetOwner(BView* owner);
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void SetTarget(BView* target);
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void _LayoutWithinContext(bool force,
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BLayoutContext* context);
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uint32 fState;
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bool fAncestorsVisible;
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int32 fInvalidationDisabled;
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BLayoutContext* fContext;
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BView* fOwner;
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BView* fTarget;
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BList fItems;
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BList fNestedLayouts;
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};
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#endif // _LAYOUT_H
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