UI: Grease Pencil Modifier Drag and Drop, Layout Changes

This patch implements the list panel system D7490 for grease pencil
modifiers. It also moves their drawing to a callback in
GpencilModifierTypeInfo in line with the extensible architecture
refactoring goal T75724.

This also adds the "set_error" function for grease pencil modifiers,
which hadn't been copied from mesh modifiers yet.

The implementation is basically exactly the same as for the modifier
patch (9b099c86123fc82).

Thanks to Matias Mendiola (mendio) for providing mockups for many
of the layout changes.

Differential Revision: https://developer.blender.org/D7978

1 files changed, 52 insertions, 0 deletions

diff --git a/source/blender/gpencil_modifiers/intern/MOD_gpencilthick.c b/source/blender/gpencil_modifiers/intern/MOD_gpencilthick.c
index b9fadea7fd0..4fa47a592ba 100644
--- a/source/blender/gpencil_modifiers/intern/MOD_gpencilthick.c
+++ b/source/blender/gpencil_modifiers/intern/MOD_gpencilthick.c
@@ -27,22 +27,33 @@
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
 
+#include "BLT_translation.h"
+
 #include "DNA_gpencil_modifier_types.h"
 #include "DNA_gpencil_types.h"
 #include "DNA_meshdata_types.h"
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
+#include "DNA_screen_types.h"
 
 #include "BKE_colortools.h"
+#include "BKE_context.h"
 #include "BKE_deform.h"
 #include "BKE_gpencil.h"
 #include "BKE_gpencil_modifier.h"
 #include "BKE_lib_query.h"
 #include "BKE_modifier.h"
+#include "BKE_screen.h"
 
 #include "DEG_depsgraph.h"
 
+#include "UI_interface.h"
+#include "UI_resources.h"
+
+#include "RNA_access.h"
+
 #include "MOD_gpencil_modifiertypes.h"
+#include "MOD_gpencil_ui_common.h"
 #include "MOD_gpencil_util.h"
 
 static void initData(GpencilModifierData *md)
@@ -166,6 +177,46 @@ static void foreachIDLink(GpencilModifierData *md, Object *ob, IDWalkFunc walk,
   walk(userData, ob, (ID **)&mmd->material, IDWALK_CB_USER);
 }
 
+static void panel_draw(const bContext *C, Panel *panel)
+{
+  uiLayout *layout = panel->layout;
+
+  PointerRNA ptr;
+  gpencil_modifier_panel_get_property_pointers(C, panel, NULL, &ptr);
+
+  uiLayoutSetPropSep(layout, true);
+
+  uiItemR(layout, &ptr, "normalize_thickness", 0, NULL, ICON_NONE);
+
+  if (RNA_boolean_get(&ptr, "normalize_thickness")) {
+    uiItemR(layout, &ptr, "thickness", 0, NULL, ICON_NONE);
+  }
+  else {
+    uiItemR(layout, &ptr, "thickness_factor", 0, NULL, ICON_NONE);
+  }
+
+  gpencil_modifier_panel_end(layout, &ptr);
+}
+
+static void mask_panel_draw(const bContext *C, Panel *panel)
+{
+  gpencil_modifier_masking_panel_draw(C, panel, true, true);
+}
+
+static void panelRegister(ARegionType *region_type)
+{
+  PanelType *panel_type = gpencil_modifier_panel_register(
+      region_type, eGpencilModifierType_Thick, panel_draw);
+  PanelType *mask_panel_type = gpencil_modifier_subpanel_register(
+      region_type, "mask", "Influence", NULL, mask_panel_draw, panel_type);
+  gpencil_modifier_subpanel_register(region_type,
+                                     "curve",
+                                     "",
+                                     gpencil_modifier_curve_header_draw,
+                                     gpencil_modifier_curve_panel_draw,
+                                     mask_panel_type);
+}
+
 GpencilModifierTypeInfo modifierType_Gpencil_Thick = {
     /* name */ "Thickness",
     /* structName */ "ThickGpencilModifierData",
@@ -188,4 +239,5 @@ GpencilModifierTypeInfo modifierType_Gpencil_Thick = {
     /* foreachObjectLink */ NULL,
     /* foreachIDLink */ foreachIDLink,
     /* foreachTexLink */ NULL,
+    /* panelRegister */ panelRegister,
 };