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Diffstat (limited to 'fltk/fltk/damage.h')
| -rw-r--r-- | fltk/fltk/damage.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/fltk/fltk/damage.h b/fltk/fltk/damage.h new file mode 100644 index 0000000..af1acc8 --- /dev/null +++ b/fltk/fltk/damage.h @@ -0,0 +1,52 @@ +#ifndef fltk_damage_h +#define fltk_damage_h + +namespace fltk { + +/*! + Values of the bits stored in Widget::damage(). + + When redrawing your widgets you should look at the damage bits to + see what parts of your widget need redrawing. The Widget::handle() + method can then set individual damage bits to limit the amount of + drawing that needs to be done, and the Widget::draw() method can + test these bits to decide what to draw: + +\code +MyClass::handle(int event) { + ... + if (change_to_part1) damage(1); + if (change_to_part2) damage(2); + if (change_to_part3) damage(4); +} + +MyClass::draw() { + if (damage() & fltk::DAMAGE_ALL) { + ... draw frame/box and other static stuff ... + } + if (damage() & (fltk::DAMAGE_ALL | 1)) draw_part1(); + if (damage() & (fltk::DAMAGE_ALL | 2)) draw_part2(); + if (damage() & (fltk::DAMAGE_ALL | 4)) draw_part3(); +} +\endcode + + Except for DAMAGE_ALL, each widget is allowed to assign any meaning + to any of the bits it wants. The enumerations are just to provide + suggested meanings. +*/ +enum { + DAMAGE_VALUE = 0x01, + DAMAGE_PUSHED = 0x02, + DAMAGE_SCROLL = 0x04, + DAMAGE_OVERLAY = 0x04, // reused value + DAMAGE_HIGHLIGHT = 0x08, + DAMAGE_CHILD = 0x10, + DAMAGE_CHILD_LABEL = 0x20, + DAMAGE_EXPOSE = 0x40, + DAMAGE_CONTENTS = 0x40, // reused value + DAMAGE_ALL = 0x80 +}; + +} + +#endif |