Usermode/Applications/axwin2_src/WM/wm.c

   1 /*
   2  * Acess GUI (AxWin) Version 2
   3  * By John Hodge (thePowersGang)
   4  *
   5  * Window Manager and Widget Control
   6  */
   7 #include "common.h"
   8 #include <stdlib.h>
   9 #include <strings.h>
  10 #include "wm.h"
  11
  12 // === IMPORTS ===
  13 extern void     Decorator_RenderWidget(tElement *Element);
  14
  15 // === PROTOTYPES ===
  16 tElement        *WM_CreateElement(tElement *Parent, int Type, int Flags);
  17 void    WM_UpdateMinDims(tElement *Element);
  18 void    WM_SetFlags(tElement *Element, int Flags);
  19 void    WM_SetSize(tElement *Element, int Size);
  20 void    WM_SetText(tElement *Element, char *Text);
  21 void    WM_UpdateDimensions(tElement *Element, int Pass);
  22 void    WM_UpdatePosition(tElement *Element);
  23 void    WM_RenderWidget(tElement *Element);
  24 void    WM_Update(void);
  25
  26 // === GLOBALS ===
  27 tElement        gWM_RootElement;
  28 struct {
  29         void    (*Init)(tElement *This);
  30         void    (*UpdateFlags)(tElement *This);
  31         void    (*UpdateSize)(tElement *This);
  32         void    (*UpdateText)(tElement *This);
  33 }       gaWM_WidgetTypes[MAX_ELETYPES] = {
  34         {NULL, NULL, NULL, NULL},       // NULL
  35         {NULL, NULL, NULL, NULL}        // Box
  36 };
  37
  38 // === CODE ===
  39 // --- Widget Creation and Control ---
  40 tElement *WM_CreateElement(tElement *Parent, int Type, int Flags)
  41 {
  42         tElement        *ret;
  43
  44         ret = calloc(sizeof(tElement), 1);
  45         if(!ret)        return NULL;
  46
  47         // Prepare
  48         ret->Type = Type;
  49         if(Parent == NULL)      Parent = &gWM_RootElement;
  50         ret->Parent = Parent;
  51         ret->Flags = Flags;
  52
  53         // Append to parent's list
  54         ret->NextSibling = Parent->LastChild;
  55         Parent->LastChild = ret;
  56         if(!Parent->FirstChild) Parent->FirstChild = ret;
  57
  58         ret->PaddingL = 2;
  59         ret->PaddingR = 2;
  60         ret->PaddingT = 2;
  61         ret->PaddingB = 2;
  62
  63         if( gaWM_WidgetTypes[Type].Init )
  64                 gaWM_WidgetTypes[Type].Init(ret);
  65
  66         WM_UpdateMinDims(ret->Parent);
  67
  68         return ret;
  69 }
  70
  71 /**
  72  * \brief Alter an element's flags
  73  */
  74 void WM_SetFlags(tElement *Element, int Flags)
  75 {
  76         // Permissions are handled in the message handler
  77         if(!Element) {
  78                 gWM_RootElement.Flags = Flags;
  79                 return ;
  80         }
  81
  82         Element->Flags = Flags;
  83         return ;
  84 }
  85
  86 void WM_SetSize(tElement *Element, int Size)
  87 {
  88         if(!Element)    return ;
  89         Element->FixedWith = Size;
  90         return ;
  91 }
  92
  93 void WM_SetText(tElement *Element, char *Text)
  94 {
  95         if(!Element)    return ;
  96         if(Element->Text)       free(Element->Text);
  97         Element->Text = strdup(Text);
  98
  99         switch(Element->Type)
 100         {
 101         case ELETYPE_IMAGE:
 102                 if(Element->Data)       free(Element->Data);
 103                 Element->Data = Image_Load( Element->Text );
 104                 if(!Element->Data) {
 105                         Element->Flags &= ~ELEFLAG_FIXEDSIZE;
 106                         return ;
 107                 }
 108
 109                 //Element->Flags |= ELEFLAG_FIXEDSIZE;
 110                 Element->CachedW = ((tImage*)Element->Data)->Width;
 111                 Element->CachedH = ((tImage*)Element->Data)->Height;
 112
 113                 if(Element->Parent && Element->Parent->Flags & ELEFLAG_VERTICAL) {
 114                         Element->MinCross = ((tImage*)Element->Data)->Width;
 115                         Element->MinWith = ((tImage*)Element->Data)->Height;
 116                 }
 117                 else {
 118                         Element->MinWith = ((tImage*)Element->Data)->Width;
 119                         Element->MinCross = ((tImage*)Element->Data)->Height;
 120                 }
 121                 break;
 122         }
 123
 124         return ;
 125 }
 126
 127 // --- Pre-Rendering ---
 128 /**
 129  * \brief Updates the dimensions of an element
 130  *
 131  * The dimensions of an element are calculated from the parent's
 132  * cross dimension (the side at right angles to the alignment) sans some
 133  * padding.
 134  */
 135 void WM_UpdateDimensions(tElement *Element, int Pass)
 136 {
 137         tElement        *child;
 138          int    nChildren = 0;
 139          int    nFixed = 0;
 140          int    maxCross = 0;
 141          int    fixedSize = 0;
 142          int    fullCross, dynWith;
 143
 144         _SysDebug("%p -> Flags = 0x%x", Element, Element->Flags);
 145         _SysDebug("%p ->CachedH = %i, ->PaddingT = %i, ->PaddingB = %i",
 146                 Element, Element->CachedH, Element->PaddingT, Element->PaddingB
 147                 );
 148         _SysDebug("%p ->CachedW = %i, ->PaddingL = %i, ->PaddingR = %i",
 149                 Element, Element->CachedW, Element->PaddingL, Element->PaddingR
 150                 );
 151
 152         // Pass 1
 153         for( child = Element->FirstChild; child; child = child->NextSibling )
 154         {
 155                 if( child->Flags & ELEFLAG_ABSOLUTEPOS )
 156                         continue ;
 157
 158                 _SysDebug("%p,%p ->FixedWith = %i", Element, child, child->FixedWith);
 159                 if( child->FixedWith )
 160                 {
 161                         nFixed ++;
 162                         fixedSize += child->FixedWith;
 163                 }
 164
 165                 if( child->FixedCross && maxCross < child->FixedCross )
 166                         maxCross = child->FixedCross;
 167                 if( child->MinCross && maxCross < child->MinCross )
 168                         maxCross = child->MinCross;
 169                 nChildren ++;
 170         }
 171
 172         _SysDebug("%p - nChildren = %i, nFixed = %i", Element, nChildren, nFixed);
 173         if( nChildren > nFixed ) {
 174                 if( Element->Flags & ELEFLAG_VERTICAL )
 175                         dynWith = Element->CachedH - Element->PaddingT
 176                                 - Element->PaddingB;
 177                 else
 178                         dynWith = Element->CachedW - Element->PaddingL
 179                                 - Element->PaddingR;
 180                 dynWith -= fixedSize;
 181                 if( dynWith < 0 )       return ;
 182                 dynWith /= nChildren - nFixed;
 183                 _SysDebug("%p - dynWith = %i", Element, dynWith);
 184         }
 185
 186         if( Element->Flags & ELEFLAG_VERTICAL )
 187                 fullCross = Element->CachedW - Element->PaddingL - Element->PaddingR;
 188         else
 189                 fullCross = Element->CachedH - Element->PaddingT - Element->PaddingB;
 190
 191         _SysDebug("%p - fullCross = %i", Element, fullCross);
 192
 193         // Pass 2 - Set sizes and recurse
 194         for( child = Element->FirstChild; child; child = child->NextSibling )
 195         {
 196                  int    cross, with;
 197
 198                 _SysDebug("%p,%p ->MinCross = %i", Element, child, child->MinCross);
 199
 200
 201                 // --- Cross Size ---
 202                 if( child->FixedCross )
 203                         cross = child->FixedCross;
 204                 // Expand to fill?
 205                 // TODO: Extra flag so options are (Expand, Equal, Wrap)
 206                 else if( child->Flags & ELEFLAG_NOEXPAND )
 207                         cross = child->MinCross;
 208                 else
 209                         cross = fullCross;
 210                 _SysDebug("%p,%p - cross = %i", Element, child, cross);
 211                 if( Element->Flags & ELEFLAG_VERTICAL )
 212                         child->CachedW = cross;
 213                 else
 214                         child->CachedH = cross;
 215
 216                 // --- With Size ---
 217                 if( child->FixedWith)
 218                         with = child->FixedWith;
 219                 else if( child->Flags & ELEFLAG_NOSTRETCH )
 220                         with = child->MinWith;
 221                 else
 222                         with = dynWith;
 223                 _SysDebug("%p,%p - with = %i", Element, child, with);
 224                 if( Element->Flags & ELEFLAG_VERTICAL )
 225                         child->CachedH = with;
 226                 else
 227                         child->CachedW = with;
 228
 229                 WM_UpdateDimensions(child, 0);
 230         }
 231 }
 232
 233 /**
 234  * \brief Updates the position of an element
 235  *
 236  * The parent element sets the positions of its children
 237  */
 238 void WM_UpdatePosition(tElement *Element)
 239 {
 240         tElement        *child;
 241          int    x, y;
 242
 243         if( Element->Flags & ELEFLAG_NORENDER ) return ;
 244
 245         _SysDebug("Element=%p{PaddingL:%i, PaddingT:%i}",
 246                 Element, Element->PaddingL, Element->PaddingT);
 247
 248         // Initialise
 249         x = Element->CachedX + Element->PaddingL;
 250         y = Element->CachedY + Element->PaddingT;
 251
 252         // Update each child
 253         for(child = Element->FirstChild; child; child = child->NextSibling)
 254         {
 255                 child->CachedX = x;
 256                 child->CachedY = y;
 257
 258                 // Set Alignment
 259                 if( Element->Flags & ELEFLAG_ALIGN_CENTER ) {
 260                         if(Element->Flags & ELEFLAG_VERTICAL )
 261                                 child->CachedX += Element->CachedW/2 - child->CachedW/2;
 262                         else
 263                                 child->CachedY += Element->CachedH/2 - child->CachedH/2;
 264                 }
 265                 else if( Element->Flags & ELEFLAG_ALIGN_END ) {
 266                         if(Element->Flags & ELEFLAG_VERTICAL )
 267                                 child->CachedX += Element->CachedW - child->CachedW;
 268                         else
 269                                 child->CachedY += Element->CachedH - child->CachedH;
 270                 }
 271
 272                 // Update child's children positions
 273                 WM_UpdatePosition(child);
 274
 275                 // Increment
 276                 if(Element->Flags & ELEFLAG_VERTICAL ) {
 277                         y += child->CachedH + Element->GapSize;
 278                 }
 279                 else {
 280                         x += child->CachedW + Element->GapSize;
 281                 }
 282         }
 283
 284         _SysDebug("Element %p (%i,%i)",
 285                  Element, Element->CachedX, Element->CachedY
 286                 );
 287 }
 288
 289
 290 /**
 291  * \brief Update the minimum dimensions of the element
 292  * \note Called after a child's minimum dimensions have changed
 293  */
 294 void WM_UpdateMinDims(tElement *Element)
 295 {
 296         tElement        *child;
 297
 298         if(!Element)    return;
 299
 300         Element->MinCross = 0;
 301         Element->MinWith = 0;
 302
 303         for(child = Element->FirstChild; child; child = child->NextSibling)
 304         {
 305                 if( Element->Parent &&
 306                         (Element->Flags & ELEFLAG_VERTICAL) == (Element->Parent->Flags & ELEFLAG_VERTICAL)
 307                         )
 308                 {
 309                         if(child->FixedCross)
 310                                 Element->MinCross += child->FixedCross;
 311                         else
 312                                 Element->MinCross += child->MinCross;
 313                         if(child->FixedWith)
 314                                 Element->MinWith += child->FixedWith;
 315                         else
 316                                 Element->MinWith += child->MinWith;
 317                 }
 318                 else
 319                 {
 320                         if(child->FixedCross)
 321                                 Element->MinWith += child->FixedCross;
 322                         else
 323                                 Element->MinWith += child->MinCross;
 324                         if(child->FixedWith)
 325                                 Element->MinCross += child->FixedWith;
 326                         else
 327                                 Element->MinCross += child->MinWith;
 328                 }
 329         }
 330
 331         // Recurse upwards
 332         WM_UpdateMinDims(Element->Parent);
 333 }
 334
 335 // --- Render ---
 336 void WM_RenderWidget(tElement *Element)
 337 {
 338         tElement        *child;
 339
 340         if( Element->Flags & ELEFLAG_NORENDER ) return ;
 341         if( Element->Flags & ELEFLAG_INVISIBLE )        return ;
 342
 343         Decorator_RenderWidget(Element);
 344
 345         for(child = Element->FirstChild; child; child = child->NextSibling)
 346         {
 347                 WM_RenderWidget(child);
 348         }
 349 }
 350
 351 void WM_Update(void)
 352 {
 353         gWM_RootElement.CachedX = 0;    gWM_RootElement.CachedY = 0;
 354         gWM_RootElement.CachedW = giScreenWidth;
 355         gWM_RootElement.CachedH = giScreenHeight;
 356         gWM_RootElement.Flags |= ELEFLAG_NOEXPAND|ELEFLAG_ABSOLUTEPOS|ELEFLAG_FIXEDSIZE;
 357
 358         WM_UpdateDimensions( &gWM_RootElement, 0 );
 359         WM_UpdatePosition( &gWM_RootElement );
 360         WM_RenderWidget( &gWM_RootElement );
 361
 362         Video_Update();
 363 }