* Copyright 2011, Haiku, Inc.
* All rights reserved. Distributed under the terms of the MIT License.
*/
#ifndef COLLAPSING_LAYOUTER_H
#define COLLAPSING_LAYOUTER_H
#include "Layouter.h"
namespace BPrivate {
namespace Layout {
* removes elements which have no constraints, or min/max constraints of
* B_SIZE_UNSET. The child layouter is given only the constraints for the
* remaining elements. When using the LayoutInfo of this layouter,
* collapsed (removed) elements are given no space on screen.
*/
class CollapsingLayouter : public Layouter {
public:
CollapsingLayouter(int32 elementCount,
float spacing);
virtual ~CollapsingLayouter();
virtual void AddConstraints(int32 element, int32 length,
float min, float max, float preferred);
virtual void SetWeight(int32 element, float weight);
virtual float MinSize();
virtual float MaxSize();
virtual float PreferredSize();
virtual LayoutInfo* CreateLayoutInfo();
virtual void Layout(LayoutInfo* layoutInfo, float size);
virtual Layouter* CloneLayouter();
private:
class ProxyLayoutInfo;
struct Constraint;
struct ElementInfo;
void _ValidateLayouter();
Layouter* _CreateLayouter();
void _DoCollapse();
void _AddConstraints();
void _AddConstraints(int32 position,
const Constraint* c);
void _SetWeights();
int32 fElementCount;
ElementInfo* fElements;
int32 fValidElementCount;
bool fHaveMultiElementConstraints;
float fSpacing;
Layouter* fLayouter;
};
}
}
using BPrivate::Layout::CollapsingLayouter;
#endif
