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align-constraint: Add CLUTTER_ALIGN_BOTH

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Just like ClutterBindConstraint has two shorthand enumerations for binding
position and size and avoid using multiple instances, ClutterAlignConstraint
should have a way to align an actor with the same alignment factor on both
axis at the same time; this is especially useful for centering actors.
This commit is contained in:
Emmanuele Bassi 2011-10-15 18:33:49 +01:00
parent 30d309c6e3
commit 1e51961f7a
2 changed files with 17 additions and 4 deletions
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15
clutter/clutter-align-constraint.c
View File

@ -142,13 +142,14 @@ clutter_align_constraint_update_allocation (ClutterConstraint *constraint,
if (align->source == NULL)
return;
clutter_actor_box_get_size (allocation, &actor_width, &actor_height);
clutter_actor_get_position (align->source, &source_x, &source_y);
clutter_actor_get_size (align->source, &source_width, &source_height);
switch (align->align_axis)
{
case CLUTTER_ALIGN_X_AXIS:
actor_width = clutter_actor_box_get_width (allocation);
allocation->x1 = ((source_width - actor_width) * align->factor)
+ source_x;
allocation->x1 = floorf (allocation->x1 + 0.5);
@ -156,13 +157,23 @@ clutter_align_constraint_update_allocation (ClutterConstraint *constraint,
break;
case CLUTTER_ALIGN_Y_AXIS:
actor_height = clutter_actor_box_get_height (allocation);
allocation->y1 = ((source_height - actor_height) * align->factor)
+ source_y;
allocation->y1 = floorf (allocation->y1 + 0.5);
allocation->y2 = allocation->y1 + actor_height;
break;
case CLUTTER_ALIGN_BOTH:
allocation->x1 = ((source_width - actor_width) * align->factor)
+ source_x;
allocation->y1 = ((source_height - actor_height) * align->factor)
+ source_y;
allocation->x1 = floorf (allocation->x1 + 0.5f);
allocation->y1 = floorf (allocation->y1 + 0.5f);
allocation->x2 = allocation->x1 + actor_width;
allocation->y2 = allocation->y1 + actor_height;
break;
default:
g_assert_not_reached ();
break;

6
clutter/clutter-enums.h
View File

@ -416,15 +416,17 @@ typedef enum {
* ClutterAlignAxis:
* @CLUTTER_ALIGN_X_AXIS: Maintain the alignment on the X axis
* @CLUTTER_ALIGN_Y_AXIS: Maintain the alignment on the Y axis
* @CLUTTER_ALIGN_BOTH: Maintain the alignment on both the X and Y axis
*
* Specifies the axis on which #ClutterAlignConstraint should maintain
* the alignment
* the alignment.
*
* Since: 1.4
*/
typedef enum { /*< prefix=CLUTTER_ALIGN >*/
CLUTTER_ALIGN_X_AXIS,
CLUTTER_ALIGN_Y_AXIS
CLUTTER_ALIGN_Y_AXIS,
CLUTTER_ALIGN_BOTH
} ClutterAlignAxis;
/**