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app: show error on attempt to clear/cut layer with locked alpha channel 

Show an error message, and blink the layers-dialog lock-box, when
attempting to clear/cut a layer with a locked alpha channel.
This commit is contained in:
Ell 2018-12-31 04:37:50 -05:00
parent 6384ff01b6
commit e967e5fa9e
1 changed files with 47 additions and 12 deletions
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59
app/actions/edit-commands.c
View File

@ -53,6 +53,7 @@
#include "display/gimpdisplayshell.h"
#include "display/gimpdisplayshell-transform.h"
#include "tools/gimptools-utils.h"
#include "tools/tool_manager.h"
#include "actions.h"
@ -63,18 +64,20 @@
/* local function prototypes */
static void edit_paste (GimpDisplay *display,
GimpPasteType paste_type,
gboolean try_svg);
static void cut_named_buffer_callback (GtkWidget *widget,
const gchar *name,
gpointer data);
static void copy_named_buffer_callback (GtkWidget *widget,
const gchar *name,
gpointer data);
static void copy_named_visible_buffer_callback (GtkWidget *widget,
const gchar *name,
gpointer data);
static gboolean check_drawable_alpha (GimpDrawable *drawable,
gpointer data);
static void edit_paste (GimpDisplay *display,
GimpPasteType paste_type,
gboolean try_svg);
static void cut_named_buffer_callback (GtkWidget *widget,
const gchar *name,
gpointer data);
static void copy_named_buffer_callback (GtkWidget *widget,
const gchar *name,
gpointer data);
static void copy_named_visible_buffer_callback (GtkWidget *widget,
const gchar *name,
gpointer data);
/* public functions */
@ -212,6 +215,9 @@ edit_cut_cmd_callback (GtkAction *action,
GError *error = NULL;
return_if_no_drawable (image, drawable, data);
if (! check_drawable_alpha (drawable, data))
return;
cut = gimp_edit_cut (image, drawable, action_data_get_context (data),
&error);
@ -456,6 +462,9 @@ edit_clear_cmd_callback (GtkAction *action,
GimpDrawable *drawable;
return_if_no_drawable (image, drawable, data);
if (! check_drawable_alpha (drawable, data))
return;
gimp_drawable_edit_clear (drawable, action_data_get_context (data));
gimp_image_flush (image);
}
@ -496,6 +505,32 @@ edit_fill_cmd_callback (GtkAction *action,
/* private functions */
static gboolean
check_drawable_alpha (GimpDrawable *drawable,
gpointer data)
{
if (gimp_drawable_has_alpha (drawable) &&
GIMP_IS_LAYER (drawable) &&
gimp_layer_get_lock_alpha (GIMP_LAYER (drawable)))
{
Gimp *gimp = action_data_get_gimp (data);
GimpDisplay *display = action_data_get_display (data);
if (gimp && display)
{
gimp_message_literal (
gimp, G_OBJECT (display), GIMP_MESSAGE_WARNING,
_("The active layer's alpha channel is locked."));
gimp_tools_blink_lock_box (gimp, GIMP_ITEM (drawable));
}
return FALSE;
}
return TRUE;
}
static void
edit_paste (GimpDisplay *display,
GimpPasteType paste_type,