src/kits/interface/GroupLayoutBuilder.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 <GroupLayoutBuilder.h>
   7
   8 #include <new>
   9
  10 #include <SpaceLayoutItem.h>
  11
  12
  13 using std::nothrow;
  14
  15
  16 // constructor
  17 BGroupLayoutBuilder::BGroupLayoutBuilder(orientation orientation,
  18         float spacing)
  19         : fRootLayout((new BGroupView(orientation, spacing))->GroupLayout())
  20 {
  21         _PushLayout(fRootLayout);
  22 }
  23
  24 // constructor
  25 BGroupLayoutBuilder::BGroupLayoutBuilder(BGroupLayout* layout)
  26         : fRootLayout(layout)
  27 {
  28         _PushLayout(fRootLayout);
  29 }
  30
  31 // constructor
  32 BGroupLayoutBuilder::BGroupLayoutBuilder(BGroupView* view)
  33         : fRootLayout(view->GroupLayout())
  34 {
  35         _PushLayout(fRootLayout);
  36 }
  37
  38 // RootLayout
  39 BGroupLayout*
  40 BGroupLayoutBuilder::RootLayout() const
  41 {
  42         return fRootLayout;
  43 }
  44
  45 // TopLayout
  46 BGroupLayout*
  47 BGroupLayoutBuilder::TopLayout() const
  48 {
  49         int32 count = fLayoutStack.CountItems();
  50         return (count > 0
  51                 ? (BGroupLayout*)fLayoutStack.ItemAt(count - 1) : NULL);
  52 }
  53
  54 // GetTopLayout
  55 BGroupLayoutBuilder&
  56 BGroupLayoutBuilder::GetTopLayout(BGroupLayout** _layout)
  57 {
  58         *_layout = TopLayout();
  59         return *this;
  60 }
  61
  62 // TopView
  63 BView*
  64 BGroupLayoutBuilder::TopView() const
  65 {
  66         if (BGroupLayout* layout = TopLayout())
  67                 return layout->Owner();
  68         return NULL;
  69 }
  70
  71 // GetTopView
  72 BGroupLayoutBuilder&
  73 BGroupLayoutBuilder::GetTopView(BView** _view)
  74 {
  75         if (BGroupLayout* layout = TopLayout())
  76                 *_view = layout->Owner();
  77         else
  78                 *_view = NULL;
  79
  80         return *this;
  81 }
  82
  83 // Add
  84 BGroupLayoutBuilder&
  85 BGroupLayoutBuilder::Add(BView* view)
  86 {
  87         if (BGroupLayout* layout = TopLayout())
  88                 layout->AddView(view);
  89         return *this;
  90 }
  91
  92 // Add
  93 BGroupLayoutBuilder&
  94 BGroupLayoutBuilder::Add(BView* view, float weight)
  95 {
  96         if (BGroupLayout* layout = TopLayout())
  97                 layout->AddView(view, weight);
  98         return *this;
  99 }
 100
 101 // Add
 102 BGroupLayoutBuilder&
 103 BGroupLayoutBuilder::Add(BLayoutItem* item)
 104 {
 105         if (BGroupLayout* layout = TopLayout())
 106                 layout->AddItem(item);
 107         return *this;
 108 }
 109
 110 // Add
 111 BGroupLayoutBuilder&
 112 BGroupLayoutBuilder::Add(BLayoutItem* item, float weight)
 113 {
 114         if (BGroupLayout* layout = TopLayout())
 115                 layout->AddItem(item, weight);
 116         return *this;
 117 }
 118
 119 // AddGroup
 120 BGroupLayoutBuilder&
 121 BGroupLayoutBuilder::AddGroup(orientation orientation, float spacing,
 122         float weight)
 123 {
 124         if (BGroupLayout* layout = TopLayout()) {
 125                 BGroupView* group = new(nothrow) BGroupView(orientation, spacing);
 126                 if (group) {
 127                         if (layout->AddView(group, weight))
 128                                 _PushLayout(group->GroupLayout());
 129                         else
 130                                 delete group;
 131                 }
 132         }
 133
 134         return *this;
 135 }
 136
 137 // End
 138 BGroupLayoutBuilder&
 139 BGroupLayoutBuilder::End()
 140 {
 141         _PopLayout();
 142         return *this;
 143 }
 144
 145 // AddGlue
 146 BGroupLayoutBuilder&
 147 BGroupLayoutBuilder::AddGlue(float weight)
 148 {
 149         if (BGroupLayout* layout = TopLayout())
 150                 layout->AddItem(BSpaceLayoutItem::CreateGlue(), weight);
 151
 152         return *this;
 153 }
 154
 155 // AddStrut
 156 BGroupLayoutBuilder&
 157 BGroupLayoutBuilder::AddStrut(float size)
 158 {
 159         if (BGroupLayout* layout = TopLayout()) {
 160                 if (layout->Orientation() == B_HORIZONTAL)
 161                         layout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(size));
 162                 else
 163                         layout->AddItem(BSpaceLayoutItem::CreateVerticalStrut(size));
 164         }
 165
 166         return *this;
 167 }
 168
 169 // SetInsets
 170 BGroupLayoutBuilder&
 171 BGroupLayoutBuilder::SetInsets(float left, float top, float right, float bottom)
 172 {
 173         if (BGroupLayout* layout = TopLayout())
 174                 layout->SetInsets(left, top, right, bottom);
 175
 176         return *this;
 177 }
 178
 179 // cast operator BGroupLayout*
 180 BGroupLayoutBuilder::operator BGroupLayout*()
 181 {
 182         return fRootLayout;
 183 }
 184
 185 // _PushLayout
 186 bool
 187 BGroupLayoutBuilder::_PushLayout(BGroupLayout* layout)
 188 {
 189         return fLayoutStack.AddItem(layout);
 190 }
 191
 192 // _PopLayout
 193 void
 194 BGroupLayoutBuilder::_PopLayout()
 195 {
 196         int32 count = fLayoutStack.CountItems();
 197         if (count > 0)
 198                 fLayoutStack.RemoveItem(count - 1);
 199 }