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| gboolean | gimp_image_undo_group_start () |
| gboolean | gimp_image_undo_group_end () |
| gboolean | gimp_image_undo_is_enabled () |
| gboolean | gimp_image_undo_disable () |
| gboolean | gimp_image_undo_enable () |
| gboolean | gimp_image_undo_freeze () |
| gboolean | gimp_image_undo_thaw () |
gboolean
gimp_image_undo_group_start (gint32 image_ID);
Starts a group undo.
This function is used to start a group undo--necessary for logically
combining two or more undo operations into a single operation. This
call must be used in conjunction with a gimp_image_undo_group_end()
call.
gboolean
gimp_image_undo_group_end (gint32 image_ID);
Finish a group undo.
This function must be called once for each
gimp_image_undo_group_start() call that is made.
gboolean
gimp_image_undo_is_enabled (gint32 image_ID);
Check if the image's undo stack is enabled.
This procedure checks if the image's undo stack is currently enabled
or disabled. This is useful when several plug-ins or scripts call
each other and want to check if their caller has already used
gimp_image_undo_disable() or gimp_image_undo_freeze().
gboolean
gimp_image_undo_disable (gint32 image_ID);
Disable the image's undo stack.
This procedure disables the image's undo stack, allowing subsequent
operations to ignore their undo steps. This is generally called in
conjunction with gimp_image_undo_enable() to temporarily disable an
image undo stack. This is advantageous because saving undo steps can
be time and memory intensive.
gboolean
gimp_image_undo_enable (gint32 image_ID);
Enable the image's undo stack.
This procedure enables the image's undo stack, allowing subsequent
operations to store their undo steps. This is generally called in
conjunction with gimp_image_undo_disable() to temporarily disable an
image undo stack.
gboolean
gimp_image_undo_freeze (gint32 image_ID);
Freeze the image's undo stack.
This procedure freezes the image's undo stack, allowing subsequent
operations to ignore their undo steps. This is generally called in
conjunction with gimp_image_undo_thaw() to temporarily disable an
image undo stack. This is advantageous because saving undo steps can
be time and memory intensive. gimp_image_undo_freeze() /
gimp_image_undo_thaw() and gimp_image_undo_disable() /
gimp_image_undo_enable() differ in that the former does not free up
all undo steps when undo is thawed, so is more suited to interactive
in-situ previews. It is important in this case that the image is
back to the same state it was frozen in before thawing, else 'undo'
behaviour is undefined.
gboolean
gimp_image_undo_thaw (gint32 image_ID);
Thaw the image's undo stack.
This procedure thaws the image's undo stack, allowing subsequent
operations to store their undo steps. This is generally called in
conjunction with gimp_image_undo_freeze() to temporarily freeze an
image undo stack. gimp_image_undo_thaw() does NOT free the undo
stack as gimp_image_undo_enable() does, so is suited for situations
where one wishes to leave the undo stack in the same state in which
one found it despite non-destructively playing with the image in the
meantime. An example would be in-situ plug-in previews. Balancing
freezes and thaws and ensuring image consistency is the
responsibility of the caller.