pdftops/FormWidget.cxx

   1 //========================================================================
   2 //
   3 // FormWidget.cc
   4 //
   5 // Copyright 2000 Derek B. Noonburg
   6 //
   7 //========================================================================
   8
   9 #ifdef __GNUC__
  10 #pragma implementation
  11 #endif
  12
  13 #include "gmem.h"
  14 #include "Object.h"
  15 #include "Gfx.h"
  16 #include "FormWidget.h"
  17
  18 //------------------------------------------------------------------------
  19 // FormWidget
  20 //------------------------------------------------------------------------
  21
  22 FormWidget::FormWidget(Dict *dict) {
  23   Object obj1, obj2;
  24   double t;
  25
  26   ok = gFalse;
  27
  28   if (dict->lookup("AP", &obj1)->isDict()) {
  29     obj1.dictLookupNF("N", &obj2);
  30     //~ this doesn't handle appearances with multiple states --
  31     //~ need to look at AS key to get state and then get the
  32     //~ corresponding entry from the N dict
  33     if (obj2.isRef()) {
  34       obj2.copy(&appearance);
  35       ok = gTrue;
  36     }
  37     obj2.free();
  38   }
  39   obj1.free();
  40
  41   if (dict->lookup("Rect", &obj1)->isArray() &&
  42       obj1.arrayGetLength() == 4) {
  43     //~ should check object types here
  44     obj1.arrayGet(0, &obj2);
  45     xMin = obj2.getNum();
  46     obj2.free();
  47     obj1.arrayGet(1, &obj2);
  48     yMin = obj2.getNum();
  49     obj2.free();
  50     obj1.arrayGet(2, &obj2);
  51     xMax = obj2.getNum();
  52     obj2.free();
  53     obj1.arrayGet(3, &obj2);
  54     yMax = obj2.getNum();
  55     obj2.free();
  56     if (xMin > xMax) {
  57       t = xMin; xMin = xMax; xMax = t;
  58     }
  59     if (yMin > yMax) {
  60       t = yMin; yMin = yMax; yMax = t;
  61     }
  62   } else {
  63     //~ this should return an error
  64     xMin = yMin = 0;
  65     xMax = yMax = 1;
  66   }
  67   obj1.free();
  68 }
  69
  70 FormWidget::~FormWidget() {
  71   appearance.free();
  72 }
  73
  74 void FormWidget::draw(Gfx *gfx) {
  75   Object obj;
  76
  77   if (appearance.fetch(&obj)->isStream()) {
  78     gfx->doWidgetForm(&obj, xMin, yMin, xMax, yMax);
  79   }
  80   obj.free();
  81 }
  82
  83 //------------------------------------------------------------------------
  84 // FormWidgets
  85 //------------------------------------------------------------------------
  86
  87 FormWidgets::FormWidgets(Object *annots) {
  88   FormWidget *widget;
  89   Object obj1, obj2;
  90   int size;
  91   int i;
  92
  93   widgets = NULL;
  94   size = 0;
  95   nWidgets = 0;
  96
  97   if (annots->isArray()) {
  98     for (i = 0; i < annots->arrayGetLength(); ++i) {
  99       if (annots->arrayGet(i, &obj1)->isDict()) {
 100         obj1.dictLookup("Subtype", &obj2);
 101         if (obj2.isName("Widget") ||
 102             obj2.isName("Stamp")) {
 103           widget = new FormWidget(obj1.getDict());
 104           if (widget->isOk()) {
 105             if (nWidgets >= size) {
 106               size += 16;
 107               widgets = (FormWidget **)grealloc(widgets,
 108                                                 size * sizeof(FormWidget *));
 109             }
 110             widgets[nWidgets++] = widget;
 111           } else {
 112             delete widget;
 113           }
 114         }
 115         obj2.free();
 116       }
 117       obj1.free();
 118     }
 119   }
 120 }
 121
 122 FormWidgets::~FormWidgets() {
 123   int i;
 124
 125   for (i = 0; i < nWidgets; ++i) {
 126     delete widgets[i];
 127   }
 128   gfree(widgets);
 129 }