UI: Select regions of text and toggle its style

1. Text can be selected along the mouse pointer by dragging the cursor .
2. After the selection we can toggle the style of the selected region.
3. Word can be selected using double click.

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -5576,6 +5576,8 @@ def km_font(params):
          {"properties": [("delta", 1)]}),
         ("font.change_character", {"type": 'DOWN_ARROW', "value": 'PRESS', "alt": True, "repeat": True},
          {"properties": [("delta", -1)]}),
+        ("font.selection_set", {"type": 'LEFTMOUSE', "value": 'PRESS',"ctrl":True,"alt":True}, None),
+        ("font.select_word", {"type": 'LEFTMOUSE', "value": 'DOUBLE_CLICK',"ctrl":True,"alt":True}, None),
         ("font.select_all", {"type": 'A', "value": 'PRESS', "ctrl": True}, None),
         ("font.text_copy", {"type": 'C', "value": 'PRESS', "ctrl": True}, None),
         ("font.text_cut", {"type": 'X', "value": 'PRESS', "ctrl": True}, None),

release/scripts/startup/bl_ui/properties_data_curve.py

@@ -357,12 +357,18 @@ class DATA_PT_font(CurveButtonsPanelText, Panel):
 
         if mode == 'EDIT_TEXT':
             layout.separator()
-
-            row = layout.row(align=True)
-            row.prop(char, "use_bold", toggle=True)
-            row.prop(char, "use_italic", toggle=True)
-            row.prop(char, "use_underline", toggle=True)
-            row.prop(char, "use_small_caps", toggle=True)
+            if text.is_selected == False :
+                row = layout.row(align=True)
+                row.prop(char, "use_bold", toggle=True)
+                row.prop(char, "use_italic", toggle=True)
+                row.prop(char, "use_underline", toggle=True)
+                row.prop(char, "use_small_caps", toggle=True)
+            else:
+                row = layout.row(align=True)
+                row.operator("font.style_toggle", text="Bold", icon='BOLD' , depress = text.select_is_bold).style = 'BOLD'
+                row.operator("font.style_toggle", text="Italic", icon='ITALIC' , depress = text.select_is_italics).style = 'ITALIC'
+                row.operator("font.style_toggle", text="Underline", icon='UNDERLINE' , depress = text.select_is_underline).style = 'UNDERLINE'
+                row.operator("font.style_toggle", text="Small Caps", icon='SMALL_CAPS' , depress = text.select_is_smallcaps).style = 'SMALL_CAPS'
 
 
 class DATA_PT_font_transform(CurveButtonsPanelText, Panel):

source/blender/blenkernel/BKE_vfont.h

@@ -41,8 +41,22 @@ typedef struct EditFont {
    * a copy of these is kept in Curve, but use these in editmode */
   int len, pos;
   int selstart, selend;
+  char _pad6[7];
+  char select_is_underline;
+  char select_is_italics;
+  char _pad0[7];
+  char select_is_bold;
+  char _pad1[7];
+  char select_is_smallcaps;
+  char _pad2[7];
+  char is_selected;
 
-  /**
+  float _pad3[7];
+  float m_loc[3];
+  int _pad4[7];
+  int m_pos;
+  int _pad9[7];
+    /**
    * ID data is older than edit-mode data.
    * Set #Main.is_memfile_undo_flush_needed when enabling.
    */
@@ -68,6 +82,19 @@ bool BKE_vfont_to_curve_ex(struct Object *ob,
                            bool *r_text_free,
                            struct CharTrans **r_chartransdata);
 bool BKE_vfont_to_curve_nubase(struct Object *ob, int mode, struct ListBase *r_nubase);
+
+bool BKE_vfont_to_curve_ex2(struct Object *ob,
+                           struct Curve *cu,
+                           int mode,
+                           struct ListBase *r_nubase,
+                           const char32_t **r_text,
+                           int *r_text_len,
+                           bool *r_text_free,
+                           struct CharTrans **r_chartransdata,
+                           float cursor_location[2], int *r_cursor_locaiton_pos);
+
+bool BKE_vfont_to_curve_curloc(struct Object *ob, int mode,float cursor_location[2], int *r_cursor_locaiton_pos);                           
+
 /**
  * \warning Expects to have access to evaluated data (i.e. passed object should be evaluated one).
  */

source/blender/blenkernel/intern/vfont.c

@@ -765,7 +765,7 @@ static float vfont_descent(const VFontData *vfd)
   return vfd->em_height - vfont_ascent(vfd);
 }
 
-static bool vfont_to_curve(Object *ob,
+static bool vfont_to_curve_ex(Object *ob,
                            Curve *cu,
                            int mode,
                            VFontToCurveIter *iter_data,
@@ -773,7 +773,8 @@ static bool vfont_to_curve(Object *ob,
                            const char32_t **r_text,
                            int *r_text_len,
                            bool *r_text_free,
-                           struct CharTrans **r_chartransdata)
+                           struct CharTrans **r_chartransdata,
+                           float cursor_location[2], int *r_cursor_locaiton_pos)
 {
   EditFont *ef = cu->editfont;
   EditFontSelBox *selboxes = NULL;
@@ -826,6 +827,14 @@ static bool vfont_to_curve(Object *ob,
     return ok;
   }
 
+  if(cursor_location==NULL)
+  {  
+    float cur_loc_temp[2];
+    cur_loc_temp[0]=0.0;
+    cur_loc_temp[1]=0.0;
+    cursor_location=cur_loc_temp;
+  } 
+
   vfd = vfont_get_data(vfont);
 
   /* The VFont Data can not be found */
@@ -873,8 +882,10 @@ static bool vfont_to_curve(Object *ob,
     if (BKE_vfont_select_get(ob, &selstart, &selend)) {
       ef->selboxes_len = (selend - selstart) + 1;
       ef->selboxes = MEM_calloc_arrayN(ef->selboxes_len, sizeof(EditFontSelBox), "font selboxes");
+      ef->is_selected= true;
     }
     else {
+      ef->is_selected=false;
       ef->selboxes_len = 0;
       ef->selboxes = NULL;
     }
@@ -906,6 +917,13 @@ static bool vfont_to_curve(Object *ob,
   }
 
   i = 0;
+  int ret=-1;
+  float min_dist;
+  if(ef!=NULL && ob!=NULL)
+  { float ffx=cursor_location[0];
+    float ffy=cursor_location[1]; 
+    min_dist=ffx*ffx+ffy*ffy;
+  }
   while (i <= slen) {
     /* Characters in the list */
     info = &custrinfo[i];
@@ -1120,9 +1138,42 @@ static bool vfont_to_curve(Object *ob,
       }
     }
     ct++;
+    if (ef != NULL && ob != NULL){
+      float fx=cursor_location[0];
+      float fy=cursor_location[1];
+      float di= (fx-xof)*(fx-xof)+(fy-yof)*(fy-yof);
+      float di2=fx*fx+fy*fy;
+
+      if(di2<=min_dist && di2<di)
+      {
+        min_dist=di2;
+        ret=-1;
+      }
+      else if(di<min_dist)
+      {
+        min_dist=di;
+        ret=i;
+      } 
+
+    }
     i++;
   }
+  if (ef != NULL && ob != NULL)
+  {
 
+    if(ret==-1)
+    {
+      ret++;
+      if(r_cursor_locaiton_pos)
+        *r_cursor_locaiton_pos=ret;
+    }
+    else if(ret>=0 && ret<=ef->len-1)
+    {
+      ret++;
+      if(r_cursor_locaiton_pos)
+        *r_cursor_locaiton_pos=ret;
+    }
+  }
   current_line_length += xof + twidth - MARGIN_X_MIN;
   longest_line_length = MAX2(current_line_length, longest_line_length);
 
@@ -1135,7 +1186,27 @@ static bool vfont_to_curve(Object *ob,
     }
   }
 
-  /* Line-data is now: width of line. */
+  bool is_bold=true;
+  bool is_italics=true;
+  bool is_underline=true;
+  bool is_smallcaps=true;
+  for(int k=selstart;k<=selend;k++)
+  {
+
+    info = &custrinfo[k];
+    is_bold = info->flag & CU_CHINFO_BOLD ? is_bold : false ;
+    is_italics = info->flag & CU_CHINFO_ITALIC ? is_italics : false ; 
+    is_underline = info->flag & CU_CHINFO_UNDERLINE ? is_underline : false ;
+    is_smallcaps = info->flag & CU_CHINFO_SMALLCAPS ? is_smallcaps : false ;  
+  }
+
+    if (ef != NULL && ob != NULL) {
+      ef->select_is_underline=is_underline;
+      ef->select_is_bold=is_bold;
+      ef->select_is_italics=is_italics;
+      ef->select_is_smallcaps=is_smallcaps;
+    }
+  /*TODO: Store the state of the text in one variable using flags*/
 
   if (cu->spacemode != CU_ALIGN_X_LEFT) {
     ct = chartransdata;
@@ -1703,6 +1774,20 @@ finally:
 #undef MARGIN_Y_MIN
 }
 
+
+static bool vfont_to_curve(Object *ob,
+                           Curve *cu,
+                           int mode,
+                           VFontToCurveIter *iter_data,
+                           ListBase *r_nubase,
+                           const char32_t **r_text,
+                           int *r_text_len,
+                           bool *r_text_free,
+                           struct CharTrans **r_chartransdata)
+{
+  return vfont_to_curve_ex(ob,cu,mode,iter_data,r_nubase,r_text,r_text_len,r_text_free,r_chartransdata,NULL,NULL);
+
+}
 #undef DESCENT
 #undef ASCENT
 
@@ -1724,8 +1809,34 @@ bool BKE_vfont_to_curve_ex(Object *ob,
   };
 
   do {
-    data.ok &= vfont_to_curve(
-        ob, cu, mode, &data, r_nubase, r_text, r_text_len, r_text_free, r_chartransdata);
+    data.ok &= vfont_to_curve_ex(
+        ob, cu, mode, &data, r_nubase, r_text, r_text_len, r_text_free, r_chartransdata,NULL,NULL);
+  } while (data.ok && ELEM(data.status, VFONT_TO_CURVE_SCALE_ONCE, VFONT_TO_CURVE_BISECT));
+
+  return data.ok;
+}
+
+bool BKE_vfont_to_curve_ex2(Object *ob,
+                           Curve *cu,
+                           int mode,
+                           ListBase *r_nubase,
+                           const char32_t **r_text,
+                           int *r_text_len,
+                           bool *r_text_free,
+                           struct CharTrans **r_chartransdata,
+                           float cursor_location[2], int *r_cursor_locaiton_pos)
+{
+  VFontToCurveIter data = {
+      .iteraction = cu->totbox * FONT_TO_CURVE_SCALE_ITERATIONS,
+      .scale_to_fit = 1.0f,
+      .word_wrap = true,
+      .ok = true,
+      .status = VFONT_TO_CURVE_INIT,
+  };
+
+  do {
+    data.ok &= vfont_to_curve_ex(
+        ob, cu, mode, &data, r_nubase, r_text, r_text_len, r_text_free, r_chartransdata,cursor_location,r_cursor_locaiton_pos);
   } while (data.ok && ELEM(data.status, VFONT_TO_CURVE_SCALE_ONCE, VFONT_TO_CURVE_BISECT));
 
   return data.ok;
@@ -1748,6 +1859,13 @@ bool BKE_vfont_to_curve(Object *ob, int mode)
   return BKE_vfont_to_curve_ex(ob, ob->data, mode, &cu->nurb, NULL, NULL, NULL, NULL);
 }
 
+bool BKE_vfont_to_curve_curloc(Object *ob, int mode,float cursor_location[2], int *r_cursor_locaiton_pos)
+{
+  Curve *cu = ob->data;
+
+  return BKE_vfont_to_curve_ex2(ob,ob->data,mode,&cu->nurb,NULL,NULL,NULL,NULL,cursor_location,r_cursor_locaiton_pos);
+}
+
 /* -------------------------------------------------------------------- */
 /** \name VFont Clipboard
  * \{ */

source/blender/editors/curve/curve_intern.h

@@ -68,6 +68,9 @@ bool select_bpoint(BPoint *bp, bool selstatus, uint8_t flag, bool hidden);
 void FONT_OT_text_insert(struct wmOperatorType *ot);
 void FONT_OT_line_break(struct wmOperatorType *ot);
 
+void FONT_OT_selection_set(struct wmOperatorType *ot);
+void FONT_OT_select_word(struct wmOperatorType *ot);
+
 void FONT_OT_case_toggle(struct wmOperatorType *ot);
 void FONT_OT_case_set(struct wmOperatorType *ot);
 void FONT_OT_style_toggle(struct wmOperatorType *ot);

source/blender/editors/curve/curve_ops.c

@@ -28,6 +28,9 @@ void ED_operatortypes_curve(void)
   WM_operatortype_append(FONT_OT_text_insert);
   WM_operatortype_append(FONT_OT_line_break);
 
+  WM_operatortype_append(FONT_OT_selection_set);
+  WM_operatortype_append(FONT_OT_select_word);
+
   WM_operatortype_append(FONT_OT_case_toggle);
   WM_operatortype_append(FONT_OT_case_set);
   WM_operatortype_append(FONT_OT_style_toggle);

source/blender/editors/curve/editfont.c

@@ -17,6 +17,7 @@
 #include "BLI_math.h"
 #include "BLI_string_cursor_utf8.h"
 #include "BLI_utildefines.h"
+#include "BLI_math_geom.h"
 
 #include "DNA_curve_types.h"
 #include "DNA_object_types.h"
@@ -422,6 +423,29 @@ static void text_update_edited(bContext *C, Object *obedit, int mode)
   WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
 }
 
+static void text_update_edited_ex(bContext *C, Object *obedit, int mode,float cursor_location[2], int *r_cursor_locaiton_pos)
+{
+  Curve *cu = obedit->data;
+  EditFont *ef = cu->editfont;
+
+  BLI_assert(ef->len >= 0);
+    Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+    BKE_vfont_to_curve_curloc(DEG_get_evaluated_object(depsgraph, obedit), mode,cursor_location,r_cursor_locaiton_pos);
+
+  cu->curinfo = ef->textbufinfo[ef->pos ? ef->pos - 1 : 0];
+
+  if (obedit->totcol > 0) {
+    obedit->actcol = cu->curinfo.mat_nr;
+    if (obedit->actcol < 1) {
+      obedit->actcol = 1;
+    }
+  }
+
+  DEG_id_tag_update(obedit->data, ID_RECALC_SELECT);
+  WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+}
+
+
 static int kill_selection(Object *obedit, int ins) /* ins == new character len */
 {
   Curve *cu = obedit->data;
@@ -1755,6 +1779,113 @@ void FONT_OT_text_insert(wmOperatorType *ot)
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Font Select Operator
+ * \{ */
+static void font_cursor_set_apply(bContext *C, const wmEvent *event)
+{
+  Object *obedit = CTX_data_active_object(C);
+  Curve *cu = obedit->data;
+  EditFont *ef = cu->editfont;
+  ARegion *region = CTX_wm_region(C);
+  int cur_loc_pos;
+  float rout[3];
+  float mal[2];
+  mal[0]=event->mval[0];
+  mal[1]=event->mval[1];
+  const float *co = obedit->obmat[3];
+  const float *no = obedit->obmat[2];
+  float plane[4];
+  plane_from_point_normal_v3(plane, co, no);
+  ED_view3d_win_to_3d_on_plane(region,plane,mal,true,rout);
+  mul_m4_v3(obedit->imat, rout);
+  float curs_loc[2];
+  curs_loc[0]=rout[0];
+  curs_loc[1]=rout[1];
+
+  text_update_edited_ex(C, obedit, FO_CURS,curs_loc,&cur_loc_pos);
+  if(cur_loc_pos<=ef->len)
+  {  
+      if ((!ef->is_selected) && (ef->selstart==0)) {
+        if(ef->pos==0)
+        ef->selstart = ef->selend =1;
+        else
+        ef->selstart = ef->selend = cur_loc_pos+1;
+    }
+    ef->selend=cur_loc_pos;
+    ef->pos=cur_loc_pos;
+  }
+
+}
+
+static int font_selection_set_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+{ 
+  Object *obedit = CTX_data_active_object(C);
+  Curve *cu = obedit->data;
+  EditFont *ef = cu->editfont;
+
+  font_cursor_set_apply(C, event);
+  ef->selstart=0;
+  ef->selend=0;
+  WM_event_add_modal_handler(C, op);
+
+  return OPERATOR_RUNNING_MODAL; 
+}
+
+static int font_selection_set_modal(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
+{
+
+  switch (event->type) {
+    case LEFTMOUSE:
+      font_cursor_set_apply(C, event);
+      return OPERATOR_FINISHED;
+    case MIDDLEMOUSE:
+    case RIGHTMOUSE:
+      return OPERATOR_FINISHED; 
+    case MOUSEMOVE:
+      font_cursor_set_apply(C, event);
+      break;
+  }
+  
+  return OPERATOR_RUNNING_MODAL;
+}
+
+void FONT_OT_selection_set(struct wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Set Selection";
+  ot->idname = "FONT_OT_selection_set";
+  ot->description = "Set cursor selection";
+  /* api callbacks */
+  ot->invoke = font_selection_set_invoke;
+  ot->modal = font_selection_set_modal;
+  ot->poll = ED_operator_editfont;
+}
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Select Word Operator
+ * \{ */
+static int font_select_word_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  move_cursor(C,PREV_WORD,false);
+  move_cursor(C,NEXT_WORD,true);
+  return OPERATOR_FINISHED; 
+}
+
+void FONT_OT_select_word(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Select Word";
+  ot->idname = "FONT_OT_select_word";
+  ot->description = "Select word under cursor";
+
+  /* api callbacks */
+  ot->exec = font_select_word_exec;
+  ot->poll = ED_operator_editfont;
+}
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Text-Box Add Operator
  * \{ */

source/blender/makesrna/intern/rna_curve.c

@@ -837,6 +837,50 @@ static bool rna_Curve_is_editmode_get(PointerRNA *ptr)
   }
 }
 
+static bool rna_Curve_is_select_underline_get(PointerRNA *ptr)
+{
+  Curve *cu= (Curve *)ptr->owner_id;
+  if(cu->editfont != NULL)
+    return cu->editfont->select_is_underline;
+  else
+    return false;
+}
+
+static bool rna_Curve_is_select_bold_get(PointerRNA *ptr)
+{
+  Curve *cu= (Curve *)ptr->owner_id;
+  if(cu->editfont != NULL)
+    return cu->editfont->select_is_bold;
+  else
+    return false;
+}
+
+static bool rna_Curve_is_select_italics_get(PointerRNA *ptr)
+{
+  Curve *cu= (Curve *)ptr->owner_id;
+  if(cu->editfont != NULL)
+    return cu->editfont->select_is_italics;
+  else
+    return false;
+}
+
+static bool rna_Curve_is_select_smallcaps_get(PointerRNA *ptr)
+{
+  Curve *cu= (Curve *)ptr->owner_id;
+  if(cu->editfont != NULL)
+    return cu->editfont->select_is_smallcaps;
+  else
+    return false;
+}
+static bool rna_Curve_is_selected(PointerRNA *ptr)
+{
+  Curve *cu= (Curve *)ptr->owner_id;
+  if(cu->editfont != NULL)
+    return cu->editfont->is_selected;
+  else
+    return false;
+}
+
 #else
 
 static const float tilt_limit = DEG2RADF(21600.0f);
@@ -1271,6 +1315,41 @@ static void rna_def_font(BlenderRNA *UNUSED(brna), StructRNA *srna)
   RNA_def_property_boolean_sdna(prop, NULL, "flag", CU_FAST);
   RNA_def_property_ui_text(prop, "Fast Editing", "Don't fill polygons while editing");
   RNA_def_property_update(prop, 0, "rna_Curve_update_data");
+
+  prop = RNA_def_property(srna, "select_is_underline", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_funcs(prop, "rna_Curve_is_select_underline_get", NULL);
+  RNA_def_property_ui_text(prop, "bold sig", "Checks for bold");
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_OVERRIDABLE_LIBRARY);
+  RNA_def_property_update(prop, 0, "rna_Curve_update_data");
+
+  prop = RNA_def_property(srna, "select_is_bold", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_funcs(prop, "rna_Curve_is_select_bold_get", NULL);
+  RNA_def_property_ui_text(prop, "bold sig", "Checks for bold");
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_OVERRIDABLE_LIBRARY);
+  RNA_def_property_update(prop, 0, "rna_Curve_update_data");
+
+  prop = RNA_def_property(srna, "select_is_italics", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_funcs(prop, "rna_Curve_is_select_italics_get", NULL);
+  RNA_def_property_ui_text(prop, "bold sig", "Checks for bold");
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_OVERRIDABLE_LIBRARY);
+  RNA_def_property_update(prop, 0, "rna_Curve_update_data");
+
+  prop = RNA_def_property(srna, "select_is_smallcaps", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_funcs(prop, "rna_Curve_is_select_smallcaps_get", NULL);
+  RNA_def_property_ui_text(prop, "bold sig", "Checks for bold");
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_OVERRIDABLE_LIBRARY);
+  RNA_def_property_update(prop, 0, "rna_Curve_update_data");
+
+  prop = RNA_def_property(srna, "is_selected", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_funcs(prop, "rna_Curve_is_selected", NULL);
+  RNA_def_property_ui_text(prop, "bold sig", "Checks for bold");
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_OVERRIDABLE_LIBRARY);
+  RNA_def_property_update(prop, 0, "rna_Curve_update_data");
 }
 
 static void rna_def_textbox(BlenderRNA *brna)