evas textblock: add/apply cursor cluster APIs based on grapheme cluster

Summary:
Add a feature for moving cursor over a grapheme cluster.
It is applied to edje_entry.c and elm_entry.c for improving
cursor handling just like other modern text editors. ex) gedit
The patch on Evas needs to update libunibreak library.
So, the patch will update libunibreak, too.
@feature

Test Plan:
1. Put "ഹലോ" in your entry.
2. Your cursor can reach at the end of text from the beginning
   only in 2 right key event with this feature.

Reviewers: raster, cedric, jpeg, herdsman, zmike, devilhorns

Reviewed By: herdsman, zmike

Subscribers: #reviewers, #committers, zmike, bowonryu, woohyun

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D5490

1 files changed, 25 insertions, 0 deletions

diff --git a/src/lib/efl/interfaces/efl_text_cursor.eo b/src/lib/efl/interfaces/efl_text_cursor.eo
index 973c7d85bd..b0e4c28b51 100644
--- a/src/lib/efl/interfaces/efl_text_cursor.eo
+++ b/src/lib/efl/interfaces/efl_text_cursor.eo
@@ -145,6 +145,20 @@ interface Efl.Text_Cursor {
             /* @inout */ cur: ptr(Efl.Text_Cursor_Cursor); [[Cursor object]]
          }
       }
+      cursor_cluster_next {
+         [[Advances to the next grapheme cluster]]
+         legacy: null;
+         params {
+            /* @inout */ cur: ptr(Efl.Text_Cursor_Cursor); [[Cursor object]]
+         }
+      }
+      cursor_cluster_prev {
+         [[Advances to the previous grapheme cluster]]
+         legacy: null;
+         params {
+            /* @inout */ cur: ptr(Efl.Text_Cursor_Cursor); [[Cursor object]]
+         }
+      }
       cursor_paragraph_char_first {
          [[Advances to the first character in this paragraph]]
          legacy: null;
@@ -232,6 +246,17 @@ interface Efl.Text_Cursor {
             @in y: int; [[Y coord to set by.]]
          }
       }
+      cursor_cluster_coord_set {
+         [[Set cursor coordinates according to grapheme clusters.
+           It does not allow to put a cursor to the middle of a grapheme cluster.
+         ]]
+         legacy: null;
+         params {
+            /* @inout */ cur: ptr(Efl.Text_Cursor_Cursor); [[Cursor object]]
+            @in x: int; [[X coord to set by.]]
+            @in y: int; [[Y coord to set by.]]
+         }
+      }
       cursor_text_insert {
          [[Adds text to the current cursor position and set the cursor to
            *after* the start of the text just added.