src/kits/interface/LayoutItem.cpp

   1 /*
   2  * Copyright 2010-2012, Haiku, Inc.
   3  * Copyright 2006, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
   4  * All rights reserved. Distributed under the terms of the MIT License.
   5  */
   6
   7
   8 #include <LayoutItem.h>
   9
  10 #include <Layout.h>
  11 #include <LayoutUtils.h>
  12 #include <View.h>
  13 #include <ViewPrivate.h>
  14
  15 #include <algorithm>
  16
  17
  18 BLayoutItem::BLayoutItem()
  19         :
  20         fLayout(NULL),
  21         fLayoutData(NULL)
  22 {
  23 }
  24
  25
  26 BLayoutItem::BLayoutItem(BMessage* from)
  27         :
  28         BArchivable(BUnarchiver::PrepareArchive(from)),
  29         fLayout(NULL),
  30         fLayoutData(NULL)
  31 {
  32         BUnarchiver(from).Finish();
  33 }
  34
  35
  36 BLayoutItem::~BLayoutItem()
  37 {
  38         if (fLayout != NULL) {
  39                 debugger("Deleting a BLayoutItem that is still attached to a layout. "
  40                         "Call RemoveSelf first.");
  41         }
  42 }
  43
  44
  45 BLayout*
  46 BLayoutItem::Layout() const
  47 {
  48         return fLayout;
  49 }
  50
  51
  52 bool
  53 BLayoutItem::RemoveSelf()
  54 {
  55         return Layout() != NULL && Layout()->RemoveItem(this);
  56 }
  57
  58
  59 void
  60 BLayoutItem::SetExplicitSize(BSize size)
  61 {
  62         SetExplicitMinSize(size);
  63         SetExplicitMaxSize(size);
  64         SetExplicitPreferredSize(size);
  65 }
  66
  67
  68 bool
  69 BLayoutItem::HasHeightForWidth()
  70 {
  71         // no "height for width" by default
  72         return false;
  73 }
  74
  75
  76 void
  77 BLayoutItem::GetHeightForWidth(float width, float* min, float* max,
  78         float* preferred)
  79 {
  80         // no "height for width" by default
  81 }
  82
  83
  84 BView*
  85 BLayoutItem::View()
  86 {
  87         return NULL;
  88 }
  89
  90
  91 void
  92 BLayoutItem::InvalidateLayout(bool children)
  93 {
  94         LayoutInvalidated(children);
  95         if (fLayout)
  96                 fLayout->InvalidateLayout(children);
  97 }
  98
  99
 100 void
 101 BLayoutItem::Relayout(bool immediate)
 102 {
 103         BView* view = View();
 104         if (view && !immediate)
 105                 view->Relayout();
 106         else if (view && immediate)
 107                 view->Layout(false);
 108 }
 109
 110
 111 void*
 112 BLayoutItem::LayoutData() const
 113 {
 114         return fLayoutData;
 115 }
 116
 117
 118 void
 119 BLayoutItem::SetLayoutData(void* data)
 120 {
 121         fLayoutData = data;
 122 }
 123
 124
 125 void
 126 BLayoutItem::AlignInFrame(BRect frame)
 127 {
 128         BSize maxSize = MaxSize();
 129         BAlignment alignment = Alignment();
 130
 131         if (HasHeightForWidth()) {
 132                 // The item has height for width, so we do the horizontal alignment
 133                 // ourselves and restrict the height max constraint respectively.
 134                 if (maxSize.width < frame.Width()
 135                         && alignment.horizontal != B_ALIGN_USE_FULL_WIDTH) {
 136                         frame.left += (int)((frame.Width() - maxSize.width)
 137                                 * alignment.horizontal);
 138                         frame.right = frame.left + maxSize.width;
 139                 }
 140                 alignment.horizontal = B_ALIGN_USE_FULL_WIDTH;
 141
 142                 float minHeight;
 143                 GetHeightForWidth(frame.Width(), &minHeight, NULL, NULL);
 144
 145                 frame.bottom = frame.top + max_c(frame.Height(), minHeight);
 146                 maxSize.height = minHeight;
 147         }
 148
 149         SetFrame(BLayoutUtils::AlignInFrame(frame, maxSize, alignment));
 150 }
 151
 152
 153 status_t
 154 BLayoutItem::Archive(BMessage* into, bool deep) const
 155 {
 156         BArchiver archiver(into);
 157         status_t err = BArchivable::Archive(into, deep);
 158
 159         if (err == B_OK)
 160                 err = archiver.Finish();
 161
 162         return err;
 163 }
 164
 165
 166 status_t
 167 BLayoutItem::AllArchived(BMessage* into) const
 168 {
 169         BArchiver archiver(into);
 170         return BArchivable::AllArchived(into);
 171 }
 172
 173
 174 status_t
 175 BLayoutItem::AllUnarchived(const BMessage* from)
 176 {
 177         return BArchivable::AllUnarchived(from);
 178 }
 179
 180
 181 void
 182 BLayoutItem::SetLayout(BLayout* layout)
 183 {
 184         if (layout == fLayout)
 185                 return;
 186
 187         BLayout* oldLayout = fLayout;
 188         fLayout = layout;
 189
 190         if (oldLayout)
 191                 DetachedFromLayout(oldLayout);
 192
 193         if (BView* view = View()) {
 194                 if (oldLayout && !fLayout) {
 195                         BView::Private(view).DeregisterLayoutItem(this);
 196                 } else if (fLayout && !oldLayout) {
 197                         BView::Private(view).RegisterLayoutItem(this);
 198                 }
 199         }
 200
 201         if (fLayout)
 202                 AttachedToLayout();
 203 }
 204
 205
 206 status_t
 207 BLayoutItem::Perform(perform_code code, void* _data)
 208 {
 209         return BArchivable::Perform(code, _data);
 210 }
 211
 212
 213 void
 214 BLayoutItem::LayoutInvalidated(bool children)
 215 {
 216         // hook method
 217 }
 218
 219
 220 void
 221 BLayoutItem::AttachedToLayout()
 222 {
 223         // hook method
 224 }
 225
 226
 227 void
 228 BLayoutItem::DetachedFromLayout(BLayout* oldLayout)
 229 {
 230         // hook method
 231 }
 232
 233
 234 void
 235 BLayoutItem::AncestorVisibilityChanged(bool shown)
 236 {
 237         // hook method
 238 }
 239
 240
 241 // Binary compatibility stuff
 242
 243
 244 void BLayoutItem::_ReservedLayoutItem1() {}
 245 void BLayoutItem::_ReservedLayoutItem2() {}
 246 void BLayoutItem::_ReservedLayoutItem3() {}
 247 void BLayoutItem::_ReservedLayoutItem4() {}
 248 void BLayoutItem::_ReservedLayoutItem5() {}
 249 void BLayoutItem::_ReservedLayoutItem6() {}
 250 void BLayoutItem::_ReservedLayoutItem7() {}
 251 void BLayoutItem::_ReservedLayoutItem8() {}
 252 void BLayoutItem::_ReservedLayoutItem9() {}
 253 void BLayoutItem::_ReservedLayoutItem10() {}
 254