src/kits/interface/layouter/OneElementLayouter.cpp

   1 /*
   2  * Copyright 2006, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
   3  * All rights reserved. Distributed under the terms of the MIT License.
   4  */
   5
   6 #include "OneElementLayouter.h"
   7
   8 #include <Size.h>
   9
  10
  11 class OneElementLayouter::MyLayoutInfo : public LayoutInfo {
  12 public:
  13         float   fSize;
  14
  15         MyLayoutInfo()
  16                 : fSize(0)
  17         {
  18         }
  19
  20         virtual float ElementLocation(int32 element)
  21         {
  22                 return 0;
  23         }
  24
  25         virtual float ElementSize(int32 element)
  26         {
  27                 return fSize;
  28         }
  29 };
  30
  31
  32 // constructor
  33 OneElementLayouter::OneElementLayouter()
  34         : fMin(-1),
  35           fMax(B_SIZE_UNLIMITED),
  36           fPreferred(-1)
  37 {
  38 }
  39
  40 // destructor
  41 OneElementLayouter::~OneElementLayouter()
  42 {
  43 }
  44
  45 // AddConstraints
  46 void
  47 OneElementLayouter::AddConstraints(int32 element, int32 length,
  48         float min, float max, float preferred)
  49 {
  50         fMin = max_c(fMin, min);
  51         fMax = min_c(fMax, max);
  52         fMax = max_c(fMax, fMin);
  53         fPreferred = max_c(fPreferred, preferred);
  54         fPreferred = max_c(fPreferred, fMin);
  55         fPreferred = min_c(fPreferred, fMax);
  56 }
  57
  58 // SetWeight
  59 void
  60 OneElementLayouter::SetWeight(int32 element, float weight)
  61 {
  62         // not needed
  63 }
  64
  65 // MinSize
  66 float
  67 OneElementLayouter::MinSize()
  68 {
  69         return fMin;
  70 }
  71
  72 // MaxSize
  73 float
  74 OneElementLayouter::MaxSize()
  75 {
  76         return fMax;
  77 }
  78
  79 // PreferredSize
  80 float
  81 OneElementLayouter::PreferredSize()
  82 {
  83         return fPreferred;
  84 }
  85
  86 // CreateLayoutInfo
  87 LayoutInfo*
  88 OneElementLayouter::CreateLayoutInfo()
  89 {
  90         return new MyLayoutInfo;
  91 }
  92
  93 // Layout
  94 void
  95 OneElementLayouter::Layout(LayoutInfo* layoutInfo, float size)
  96 {
  97         ((MyLayoutInfo*)layoutInfo)->fSize = max_c(size, fMin);
  98 }
  99
 100 // CloneLayouter
 101 Layouter*
 102 OneElementLayouter::CloneLayouter()
 103 {
 104         OneElementLayouter* layouter = new OneElementLayouter;
 105         layouter->fMin = fMin;
 106         layouter->fMax = fMax;
 107         layouter->fPreferred = fPreferred;
 108
 109         return layouter;
 110 }