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- //----------------------------------------------------------------------------
- // ObjectWindows - (C) Copyright 1992, 1993 by Borland International
- // include\owl\layoutco.h
- // Declaration of class TLayoutConstraint.
- //----------------------------------------------------------------------------
- #if !defined(__OWL_LAYOUTCO_H)
- #define __OWL_LAYOUTCO_H
-
- #if !defined(__OWL_OWLDEFS_H)
- #include <owl\owldefs.h>
- #endif
- class _OWLCLASS TWindow;
-
- #define lmParent 0
-
- enum TEdge {lmLeft, lmTop, lmRight, lmBottom, lmCenter};
- enum TWidthHeight {lmWidth = lmCenter + 1, lmHeight};
-
- enum TMeasurementUnits {lmPixels, lmLayoutUnits};
-
- enum TRelationship {lmAsIs = 0,
- lmPercentOf = 1,
- lmAbove = 2, lmLeftOf = lmAbove,
- lmBelow = 3, lmRightOf = lmBelow,
- lmSameAs = 4,
- lmAbsolute = 5};
-
- //
- // struct TLayoutConstraint
- // ------ -----------------
- //
- // layout constraints are specified as a relationship between an edge/size
- // of one window and an edge/size of one of the window's siblings or parent
- //
- // it is acceptable for a window to have one of its sizes depend on the
- // size of the opposite dimension (e.g. width is twice height)
- //
- // distances can be specified in either pixels or layout units
- //
- // a layout unit is defined by dividing the font "em" quad into 8 vertical
- // and 8 horizontal segments. we get the font by self-sending WM_GETFONT
- // (we use the system font if WM_GETFONT returns 0)
- //
- // "lmAbove", "lmBelow", "lmLeftOf", and "lmRightOf" are only used with edge
- // constraints. they place the window 1 pixel to the indicated side(i.e.
- // adjacent to the other window) and then adjust it by "Margin"(e.g. above
- // window "A" by 6)
- //
- // NOTE: "Margin" is either added to ("lmAbove" and "lmLeftOf") or subtracted
- // from("lmBelow" and "lmRightOf") depending on the relationship
- //
- // "lmSameAs" can be used with either edges or sizes, and it doesn't offset
- // by 1 pixel like the above four relationships did. it also uses "Value"
- // (e.g. same width as window "A" plus 10)
- //
- // NOTE: "Value" is always *added*. use a negative number if you want the
- // effect to be subtractive
- //
- struct TLayoutConstraint {
- TWindow* RelWin; // relative window, lmParent for parent
-
- UINT MyEdge : 4; // edge or size (width/height)
- TRelationship Relationship : 4;
- TMeasurementUnits Units : 4;
- UINT OtherEdge : 4; // edge or size (width/height)
-
- //
- // this union is just for naming convenience
- //
- union {
- int Margin; // used for "lmAbove", "lmBelow", "lmLeftOf", "lmRightOf"
- int Value; // used for "lmSameAs" and "lmAbsolute"
- int Percent; // used for "lmPercentOf"
- };
- };
-
- //
- // struct TEdgeConstraint
- // ------ ---------------
- //
- // adds member functions for setting edge constraints
- //
- struct TEdgeConstraint : public TLayoutConstraint {
- //
- // for setting arbitrary edge constraints. use it like this:
- // metrics->X.Set(lmLeft, lmRightOf, lmParent, lmLeft, 10);
- //
- void Set(TEdge edge, TRelationship rel, TWindow* otherWin,
- TEdge otherEdge, int value = 0)
- {RelWin = otherWin; MyEdge = edge; Relationship = rel;
- OtherEdge = otherEdge; Value = value;}
-
- //
- // these four member functions can be used to position your window with
- // respective to a sibling window. you specify the sibling window and an
- // optional margin between the two windows
- //
- void LeftOf(TWindow* sibling, int margin = 0)
- {Set(lmRight, lmLeftOf, sibling, lmLeft, margin);}
- void RightOf(TWindow* sibling, int margin = 0)
- {Set(lmLeft, lmRightOf, sibling, lmRight, margin);}
- void Above(TWindow* sibling, int margin = 0)
- {Set(lmBottom, lmAbove, sibling, lmTop, margin);}
- void Below(TWindow* sibling, int margin = 0)
- {Set(lmTop, lmBelow, sibling, lmBottom, margin);}
-
- //
- // these two work on the same edge, e.g. "SameAs(win, lmLeft)" means
- // that your left edge should be the same as the left edge of "otherWin"
- //
- void SameAs(TWindow* otherWin, TEdge edge)
- {Set(edge, lmSameAs, otherWin, edge, 0);}
- void PercentOf(TWindow* otherWin, TEdge edge, int percent)
- {Set(edge, lmPercentOf, otherWin, edge, percent);}
-
- //
- // setting an edge to a fixed value
- //
- void Absolute(TEdge edge, int value)
- {MyEdge = edge; Value = value; Relationship = lmAbsolute;}
- };
-
- //
- // struct TEdgeOrSizeConstraint
- // ------ ---------------------
- //
- template<int widthOrHeight>
- struct TEdgeOrSizeConstraint : public TEdgeConstraint {
- //
- // percent of another window's width/height (defaults to being the same
- // dimension but could be the opposite dimension, e.g. make my width 50%
- // of my parent's height)
- //
- void PercentOf(TWindow* otherWin,
- int percent,
- TWidthHeight otherWidthHeight = widthOrHeight)
- {RelWin = otherWin; MyEdge = widthOrHeight;
- Relationship = lmPercentOf; OtherEdge = otherWidthHeight;
- Percent = percent;}
-
- //
- // same as another window's width/height(defaults to being the same
- // dimension but could be the opposite dimension, e.g. make my width
- // the same as my height)
- //
- void SameAs(TWindow* otherWin,
- TWidthHeight otherWidthHeight = widthOrHeight,
- int value = 0)
- {RelWin = otherWin; MyEdge = widthOrHeight;
- Relationship = lmSameAs; OtherEdge = otherWidthHeight;
- Value = value;}
-
- //
- // setting a width/height to a fixed value
- //
- void Absolute(int value)
- {MyEdge = widthOrHeight; Value = value; Relationship = lmAbsolute;}
-
- //
- // redefine member functions defined by TEdgeConstraint that are hidden by
- // TEdgeOrSizeConstraint
- //
- void Absolute(TEdge edge, int value)
- {TEdgeConstraint::Absolute(edge, value);}
- void PercentOf(TWindow* otherWin, TEdge edge, int percent)
- {TEdgeConstraint::PercentOf(otherWin, edge, percent);}
- void SameAs(TWindow* otherWin, TEdge edge)
- {TEdgeConstraint::SameAs(otherWin, edge);}
- };
-
- typedef TEdgeOrSizeConstraint<lmWidth> TEdgeOrWidthConstraint;
- typedef TEdgeOrSizeConstraint<lmHeight> TEdgeOrHeightConstraint;
-
- #endif // __OWL_LAYOUTCO_H
-