1 files changed, 41 insertions, 0 deletions
diff --git a/fltk/fltk/layout.h b/fltk/fltk/layout.h
new file mode 100644
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--- /dev/null
+++ b/fltk/fltk/layout.h
@@ -0,0 +1,41 @@
+#ifndef fltk_layout_h
+#define fltk_layout_h
+
+namespace fltk {
+
+/*!
+  Values of the bits stored in Widget::layout_damage().
+
+  When a widget resized or moved (or when it is initially created),
+  flags are set in Widget::layout_damage() to indicate the layout is
+  damaged. This will cause the virtual function Widget::layout() to be
+  called just before fltk attempts to draw the windows on the screen.
+  This is useful because often calculating the new layout is quite
+  expensive, this expense is now deferred until the user will actually
+  see the new size.
+
+  Some Group widgets such as fltk::PackedGroup will also use the
+  virtual Widget::layout() function to find out how big a widget
+  should be.  A Widget is allowed to change it's own dimensions in
+  layout() (except it is not allowed to change it if called a second
+  time with no changes other than it's x/y position). This allows
+  widgets to resize to fit their contents.
+
+  The layout bits are turned on by calling Widget::relayout().
+*/
+enum {
+  LAYOUT_X	= 0x01, /*!< Widget::x() changed by resize() */
+  LAYOUT_Y	= 0x02, /*!< Widget::y() changed by resize() */
+  LAYOUT_XY	= 0x03, /*!< Same as LAYOUT_X|LAYOUT_Y */
+  LAYOUT_W	= 0x04,	/*!< Widget::w() changed by resize() */
+  LAYOUT_H	= 0x08,	/*!< Widget::h() changed by resize() */
+  LAYOUT_WH	= 0x0C, /*!< Same as LAYOUT_W|LAYOUT_H */
+  LAYOUT_XYWH	= 0x0F, /*!< Same as LAYOUT_XY|LAYOUT_WH */
+  LAYOUT_CHILD	= 0x10, /*!< Widget::layout() needs to be called on a child of this group widget. */
+  LAYOUT_USER   = 0x20, /*!< The moving/resizing is being caused by the user and not internal code. */
+  LAYOUT_DAMAGE	= 0x80	/*!< Widget::relayout() was called. */
+};
+
+}
+
+#endif