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                 // Cross Size
 197                 if( child->FixedCross ) {
 198                         if( Element->Flags & ELEFLAG_VERTICAL )
 199                                 child->CachedW = child->FixedCross;
 200                         else
 201                                 child->CachedH = child->FixedCross;
 202                 }
 203                 else {
 204                          int    cross;
 205                         _SysDebug("%p,%p ->MinCross = %i", Element, child, child->MinCross);
 206                         // Expand to fill?
 207                         // TODO: Extra flag so options are (Expand, Equal, Wrap)
 208                         if( child->Flags & ELEFLAG_NOEXPAND )
 209                                 cross = child->MinCross;
 210                         else
 211                                 cross = fullCross;
 212
 213                         _SysDebug("%p,%p - cross = %i", Element, child, cross);
 214
 215                         if( Element->Flags & ELEFLAG_VERTICAL )
 216                                 child->CachedW = cross;
 217                         else
 218                                 child->CachedH = cross;
 219                 }
 220
 221                 // With size
 222                 if( child->FixedWith ) {
 223                         if( Element->Flags & ELEFLAG_VERTICAL )
 224                                 child->CachedH = child->FixedWith;
 225                         else
 226                                 child->CachedW = child->FixedWith;
 227                 }
 228                 else {
 229                         if( Element->Flags & ELEFLAG_VERTICAL )
 230                                 child->CachedH = dynWith;
 231                         else
 232                                 child->CachedW = dynWith;
 233                 }
 234
 235                 WM_UpdateDimensions(child, 0);
 236         }
 237 }
 238
 239 /**
 240  * \brief Updates the position of an element
 241  *
 242  * The parent element sets the positions of its children
 243  */
 244 void WM_UpdatePosition(tElement *Element)
 245 {
 246         tElement        *child;
 247          int    x, y;
 248
 249         if( Element->Flags & ELEFLAG_NORENDER ) return ;
 250
 251         _SysDebug("Element=%p{PaddingL:%i, PaddingT:%i}",
 252                 Element, Element->PaddingL, Element->PaddingT);
 253
 254         // Initialise
 255         x = Element->CachedX + Element->PaddingL;
 256         y = Element->CachedY + Element->PaddingT;
 257
 258         // Update each child
 259         for(child = Element->FirstChild; child; child = child->NextSibling)
 260         {
 261                 child->CachedX = x;
 262                 child->CachedY = y;
 263
 264                 // Set Alignment
 265                 if( Element->Flags & ELEFLAG_ALIGN_CENTER ) {
 266                         if(Element->Flags & ELEFLAG_VERTICAL )
 267                                 child->CachedX += Element->CachedW/2 - child->CachedW/2;
 268                         else
 269                                 child->CachedY += Element->CachedH/2 - child->CachedH/2;
 270                 }
 271                 else if( Element->Flags & ELEFLAG_ALIGN_END ) {
 272                         if(Element->Flags & ELEFLAG_VERTICAL )
 273                                 child->CachedX += Element->CachedW - child->CachedW;
 274                         else
 275                                 child->CachedY += Element->CachedH - child->CachedH;
 276                 }
 277
 278                 // Update child's children positions
 279                 WM_UpdatePosition(child);
 280
 281                 // Increment
 282                 if(Element->Flags & ELEFLAG_VERTICAL ) {
 283                         y += child->CachedH + Element->GapSize;
 284                 }
 285                 else {
 286                         x += child->CachedW + Element->GapSize;
 287                 }
 288         }
 289
 290         _SysDebug("Element %p (%i,%i)",
 291                  Element, Element->CachedX, Element->CachedY
 292                 );
 293 }
 294
 295
 296 /**
 297  * \brief Update the minimum dimensions of the element
 298  * \note Called after a child's minimum dimensions have changed
 299  */
 300 void WM_UpdateMinDims(tElement *Element)
 301 {
 302         tElement        *child;
 303
 304         if(!Element)    return;
 305
 306         Element->MinCross = 0;
 307         Element->MinWith = 0;
 308
 309         for(child = Element->FirstChild; child; child = child->NextSibling)
 310         {
 311                 if( Element->Parent &&
 312                         (Element->Flags & ELEFLAG_VERTICAL) == (Element->Parent->Flags & ELEFLAG_VERTICAL)
 313                         )
 314                 {
 315                         if(child->FixedCross)
 316                                 Element->MinCross += child->FixedCross;
 317                         else
 318                                 Element->MinCross += child->MinCross;
 319                         if(child->FixedWith)
 320                                 Element->MinWith += child->FixedWith;
 321                         else
 322                                 Element->MinWith += child->MinWith;
 323                 }
 324                 else
 325                 {
 326                         if(child->FixedCross)
 327                                 Element->MinWith += child->FixedCross;
 328                         else
 329                                 Element->MinWith += child->MinCross;
 330                         if(child->FixedWith)
 331                                 Element->MinCross += child->FixedWith;
 332                         else
 333                                 Element->MinCross += child->MinWith;
 334                 }
 335         }
 336
 337         // Recurse upwards
 338         WM_UpdateMinDims(Element->Parent);
 339 }
 340
 341 // --- Render ---
 342 void WM_RenderWidget(tElement *Element)
 343 {
 344         tElement        *child;
 345
 346         if( Element->Flags & ELEFLAG_NORENDER ) return ;
 347         if( Element->Flags & ELEFLAG_INVISIBLE )        return ;
 348
 349         Decorator_RenderWidget(Element);
 350
 351         for(child = Element->FirstChild; child; child = child->NextSibling)
 352         {
 353                 WM_RenderWidget(child);
 354         }
 355 }
 356
 357 void WM_Update(void)
 358 {
 359         gWM_RootElement.CachedX = 0;    gWM_RootElement.CachedY = 0;
 360         gWM_RootElement.CachedW = giScreenWidth;
 361         gWM_RootElement.CachedH = giScreenHeight;
 362         gWM_RootElement.Flags |= ELEFLAG_NOEXPAND|ELEFLAG_ABSOLUTEPOS|ELEFLAG_FIXEDSIZE;
 363
 364         WM_UpdateDimensions( &gWM_RootElement, 0 );
 365         WM_UpdatePosition( &gWM_RootElement );
 366         WM_RenderWidget( &gWM_RootElement );
 367
 368         Video_Update();
 369 }