gfx/public/nsMargin.h

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  37
  38 #ifndef NSMARGIN_H
  39 #define NSMARGIN_H
  40
  41 #include "nsCoord.h"
  42 #include "gfxCore.h"
  43
  44 struct nsMargin {
  45   nscoord top, right, bottom, left;
  46
  47   // Constructors
  48   nsMargin() {}
  49   nsMargin(const nsMargin& aMargin) {*this = aMargin;}
  50   nsMargin(nscoord aLeft,  nscoord aTop,
  51            nscoord aRight, nscoord aBottom) {left = aLeft; top = aTop;
  52                                              right = aRight; bottom = aBottom;}
  53
  54   void SizeTo(nscoord aLeft,  nscoord aTop,
  55               nscoord aRight, nscoord aBottom) {left = aLeft; top = aTop;
  56                                                 right = aRight; bottom = aBottom;}
  57   void SizeBy(nscoord aLeft, nscoord  aTop,
  58               nscoord aRight, nscoord aBottom) {left += aLeft; top += aTop;
  59                                                 right += aRight; bottom += aBottom;}
  60
  61   nscoord LeftRight() const { return left + right; }
  62   nscoord TopBottom() const { return top + bottom; }
  63
  64 #if (NS_SIDE_TOP == 0) && (NS_SIDE_RIGHT == 1) && (NS_SIDE_BOTTOM == 2) && (NS_SIDE_LEFT == 3)
  65   nscoord& side(PRUint8 aSide) {
  66     NS_PRECONDITION(aSide <= NS_SIDE_LEFT, "Out of range side");
  67     return *(&top + aSide);
  68   }
  69
  70   nscoord side(PRUint8 aSide) const {
  71     NS_PRECONDITION(aSide <= NS_SIDE_LEFT, "Out of range side");
  72     return *(&top + aSide);
  73   }
  74 #else
  75 #error "Somebody changed the side constants."
  76 #endif
  77
  78   // Overloaded operators. Note that '=' isn't defined so we'll get the
  79   // compiler generated default assignment operator
  80   PRBool operator==(const nsMargin& aMargin) const {
  81     return (PRBool) ((left == aMargin.left) && (top == aMargin.top) &&
  82                      (right == aMargin.right) && (bottom == aMargin.bottom));
  83   }
  84   PRBool operator!=(const nsMargin& aMargin) const {
  85     return (PRBool) ((left != aMargin.left) || (top != aMargin.top) ||
  86                      (right != aMargin.right) || (bottom != aMargin.bottom));
  87   }
  88   nsMargin operator+(const nsMargin& aMargin) const {
  89     return nsMargin(left + aMargin.left, top + aMargin.top,
  90                     right + aMargin.right, bottom + aMargin.bottom);
  91   }
  92   nsMargin operator-(const nsMargin& aMargin) const {
  93     return nsMargin(left - aMargin.left, top - aMargin.top,
  94                     right - aMargin.right, bottom - aMargin.bottom);
  95   }
  96   nsMargin& operator+=(const nsMargin& aMargin) {left += aMargin.left;
  97                                                  top += aMargin.top;
  98                                                  right += aMargin.right;
  99                                                  bottom += aMargin.bottom;
 100                                                  return *this;}
 101   nsMargin& operator-=(const nsMargin& aMargin) {left -= aMargin.left;
 102                                                  top -= aMargin.top;
 103                                                  right -= aMargin.right;
 104                                                  bottom -= aMargin.bottom;
 105                                                  return *this;}
 106 };
 107
 108 #ifdef NS_COORD_IS_FLOAT
 109 struct nsIntMargin {
 110   PRInt32 top, right, bottom, left;
 111
 112   // Constructors
 113   nsIntMargin() {}
 114   nsIntMargin(const nsIntMargin& aMargin) {*this = aMargin;}
 115   nsIntMargin(PRInt32 aLeft,  PRInt32 aTop,
 116               PRInt32 aRight, PRInt32 aBottom) {left = aLeft; top = aTop;
 117                                                 right = aRight; bottom = aBottom;}
 118 };
 119 #else
 120 typedef nsMargin nsIntMargin;
 121 #endif
 122
 123 #endif /* NSMARGIN_H */