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fixes to the comments

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Havoc Pennington 2002-07-24 19:52:21 +00:00
parent 88a0d1ff03
commit 1af2020151
1 changed files with 91 additions and 18 deletions
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107
src/constraints.c
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@ -46,11 +46,11 @@
* A constraint that the position can't go above the top panel would
* look like this:
*
* new_y > screen_top_bound
* new_y >= screen_top_bound
*
* Substitute:
*
* orig_y + dy > screen_top_bound
* orig_y + dy >= screen_top_bound
*
* Find the "boundary point" by changing to an equality:
*
@ -60,11 +60,11 @@
*
* dy = screen_top_bound - orig_y
*
* Plug that back into the size/position computations:
* This dy is now the _maximum_ dy and you constrain dy with that
* value, applying it to both the move and the resize:
*
* new_y = orig_y + screen_top_bound - orig_y
* new_y = screen_top_bound
* new_height = orig_height - screen_top_bound + orig_y;
* new_height = orig_height - dy;
* new_y = orig_y + dy;
*
* This way the constraint is applied simultaneously to size/position,
* so you aren't running the risk of constraining one but still
@ -93,6 +93,9 @@
* left edges as the edges that vary, with a dx/dy that are the delta
* from the current size to the requested size.
*
* This method applies to any ConfigureRequest that does a simultaneous
* move/resize.
*
*/
typedef void (* MetaConstraintFunc) (MetaWindow *window,
@ -100,18 +103,20 @@ typedef void (* MetaConstraintFunc) (MetaWindow *window,
const MetaRectangle *orig,
MetaRectangle *new);
enum
{
VERTICAL_TOP,
VERTICAL_BOTTOM,
VERTICAL_CENTER
};
/* Things we can move, constraints apply
* in the context of these dimensions
*/
enum
{
HORIZONTAL_LEFT,
HORIZONTAL_RIGHT,
HORIZONTAL_CENTER
RESIZE_TOP,
RESIZE_BOTTOM,
RESIZE_LEFT,
RESIZE_RIGHT,
RESIZE_VERTICAL_CENTER,
RESIZE_HORIZONTAL_CENTER,
MOVE_VERTICAL,
MOVE_HORIZONTAL
};
/* Maximization constraint:
@ -122,16 +127,84 @@ enum
* new_h = workarea_h - frame_top - frame_bottom
*
* No need to do anything hard because it just locks specific
* size/pos
* size/pos.
*
* The min/max size constraints override maximization.
*/
/* Full screen constraint:
*
* new_x = 0;
* new_y = 0;
* new_w = xinerama_width;
* new_h = xinerama_height;
*
* The min/max size constraints override fullscreen.
*/
/* Titlebar is onscreen constraint:
*
* Constants:
* titlebar_width_onscreen = amount of titlebar width that has to be onscreen
* nw_x, nw_y = left/top edges that titlebar can't go outside
* se_x, se_y = right/bottom edges
*
* NW limit has priority over SE, since titlebar is on NW
*
* RESIZE_LEFT:
* new_width = orig_width + dx
* new_x = orig_x - dx
*
* new_x >= nw_x - (left_width + new_width + right_width - titlebar_width_onscreen)
*
* orig_x - dx >= nw_x - (left_width + orig_width + dx + right_width - titlebar_width_onscreen)
* 0 >= nw_x - left_width - orig_width - right_width + titlebar_width_onscreen - orig_x
*
* i.e. dx drops out so there is no constraint at all when moving left edge.
*
* RESIZE_RIGHT and RESIZE_BOTTOM are the same, cannot break this constraint
* by moving in those directions.
*
* RESIZE_TOP:
*
* new_height = orig_height - dy
* new_y = orig_y + dy
*
* Can't move titlebar off the top at all regardless of height:
* new_y >= nw_y + top_height
*
* orig_y + dy = nw_y + top_height
* dy = nw_y + top_height - orig_y
*
* Max dy is thus (nw_y + top_height - orig_y)
*
* RESIZE_VERTICAL_CENTER:
*
*
*
*
*/
void
meta_window_constrain (MetaWindow *window,
MetaFrameGeometry *fgeom,
MetaFrameGeometry *orig_fgeom,
int resize_gravity,
const MetaRectangle *orig,
MetaRectangle *new)
{
MetaFrameGeometry fgeom;
/* Create a fake frame geometry if none really exists */
if (orig_fgeom)
fgeom = *orig_fgeom;
else
{
fgeom.top_height = 0;
fgeom.bottom_height = 0;
fgeom.left_width = 0;
fgeom.right_width = 0;
}