From 702e85ef849a2ad0a34ef0bd2d9f021e4a6e773f Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Fri, 9 Mar 2012 23:10:07 +0000
Subject: picky changes to mouse cursor text selection behavior, previously as
 soon as the mouse was before a character it would select the previous, even
 if the cursor was closer to the space between the next 2 chars.

now find the closest point inbetween both chars.
---
 source/blender/blenkernel/intern/modifiers_bmesh.c |  3 +-
 .../blender/editors/interface/interface_handlers.c | 49 ++++++++++++++++------
 source/blender/editors/space_text/text_ops.c       |  9 +++-
 3 files changed, 46 insertions(+), 15 deletions(-)

(limited to 'source')

diff --git a/source/blender/blenkernel/intern/modifiers_bmesh.c b/source/blender/blenkernel/intern/modifiers_bmesh.c
index 496533cacd7..8fe8c9cbaed 100644
--- a/source/blender/blenkernel/intern/modifiers_bmesh.c
+++ b/source/blender/blenkernel/intern/modifiers_bmesh.c
@@ -120,9 +120,8 @@ void DM_to_bmesh_ex(DerivedMesh *dm, BMesh *bm)
 		f->mat_nr = mp->mat_nr;
 
 		l = BM_iter_new(&liter, bm, BM_LOOPS_OF_FACE, f);
-		k = mp->loopstart;
 
-		for (j = 0; l; l = BM_iter_step(&liter), k++) {
+		for (k = mp->loopstart; l; l = BM_iter_step(&liter), k++) {
 			CustomData_to_bmesh_block(&dm->loopData, &bm->ldata, k, &l->head.data);
 		}
 
diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index fbc196467aa..cae6f61d269 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -1282,13 +1282,33 @@ static void ui_textedit_set_cursor_pos(uiBut *but, uiHandleButtonData *data, sho
 	}
 	/* mouse inside the widget */
 	else if (x >= startx) {
+		int pos_i;
+
+		/* keep track of previous distance from the cursor to the char */
+		float cdist, cdist_prev = 0.0f;
+		short pos_prev;
+
 		const float aspect_sqrt= sqrtf(but->block->aspect);
 		
-		but->pos= strlen(origstr)-but->ofs;
-		
-		/* XXX does not take zoom level into account */
-		while (startx + aspect_sqrt * BLF_width(fstyle->uifont_id, origstr+but->ofs) > x) {
-			int pos_i = but->pos;
+		but->pos = pos_prev = strlen(origstr) - but->ofs;
+
+		while (TRUE) {
+			/* XXX does not take zoom level into account */
+			cdist = startx + aspect_sqrt * BLF_width(fstyle->uifont_id, origstr + but->ofs);
+
+			/* check if position is found */
+			if (cdist < x) {
+				/* check is previous location was infact closer */
+				if (((float)x - cdist) > (cdist_prev - (float)x)) {
+					but->pos = pos_prev;
+				}
+				break;
+			}
+			cdist_prev = cdist;
+			pos_prev   = but->pos;
+			/* done with tricky distance checks */
+
+			pos_i = but->pos;
 			if (but->pos <= 0) break;
 			if (BLI_str_cursor_step_prev_utf8(origstr, but->ofs, &pos_i)) {
 				but->pos = pos_i;
@@ -1580,6 +1600,8 @@ static int ui_textedit_copypaste(uiBut *but, uiHandleButtonData *data, int paste
 
 static void ui_textedit_begin(bContext *C, uiBut *but, uiHandleButtonData *data)
 {
+	int len;
+
 	if(data->str) {
 		MEM_freeN(data->str);
 		data->str= NULL;
@@ -1594,15 +1616,18 @@ static void ui_textedit_begin(bContext *C, uiBut *but, uiHandleButtonData *data)
 		ui_convert_to_unit_alt_name(but, data->str, data->maxlen);
 	}
 
-	data->origstr= BLI_strdup(data->str);
-	data->selextend= 0;
-	data->selstartx= 0;
+	/* won't change from now on */
+	len = strlen(data->str);
+
+	data->origstr = BLI_strdupn(data->str, len);
+	data->selextend = 0;
+	data->selstartx = 0;
 
 	/* set cursor pos to the end of the text */
-	but->editstr= data->str;
-	but->pos= strlen(data->str);
-	but->selsta= 0;
-	but->selend= strlen(data->str);
+	but->editstr = data->str;
+	but->pos = len;
+	but->selsta = 0;
+	but->selend = len;
 
 	/* optional searchbox */
 	if(but->type==SEARCH_MENU) {
diff --git a/source/blender/editors/space_text/text_ops.c b/source/blender/editors/space_text/text_ops.c
index 9fed3db7f16..17857275d36 100644
--- a/source/blender/editors/space_text/text_ops.c
+++ b/source/blender/editors/space_text/text_ops.c
@@ -73,6 +73,13 @@
 
 /************************ poll ***************************/
 
+
+BM_INLINE int text_pixel_x_to_index(SpaceText *st, const int x)
+{
+	/* add half the char width so mouse cursor selection is inbetween letters */
+	return (x + (st->cwidth / 2)) / st->cwidth;
+}
+
 static int text_new_poll(bContext *UNUSED(C))
 {
 	return 1;
@@ -2530,7 +2537,7 @@ static void text_cursor_set_to_pos(SpaceText *st, ARegion *ar, int x, int y, int
 	else x-= TXT_OFFSET;
 
 	if(x<0) x= 0;
-	x = (x/st->cwidth) + st->left;
+	x = text_pixel_x_to_index(st, x) + st->left;
 	
 	if(st->wordwrap) {
 		text_cursor_set_to_pos_wrapped(st, ar, x, y, sel);
-- 
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