From 9ab619bd3c57d681a3906abf0dc10d5376d01319 Mon Sep 17 00:00:00 2001
From: Jaakko Keränen <jaakko.keranen@iki.fi>
Date: Wed, 21 Jul 2021 08:55:12 +0300
Subject: Text: Finding the advance position of a character

---
 src/ui/text.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'src/ui/text.c')

diff --git a/src/ui/text.c b/src/ui/text.c
index d6a45c69..ce383ccf 100644
--- a/src/ui/text.c
+++ b/src/ui/text.c
@@ -1380,8 +1380,9 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
         /* TODO: Duplicated args? */
         iAssert(equalRange_Rangecc(wrap->text, args->text));
         /* Initialize the wrap range. */
-        wrap->wrapRange_ = args->text;
-        wrap->hitChar_out = NULL;
+        wrap->wrapRange_        = args->text;
+        wrap->hitAdvance_out    = zero_I2();
+        wrap->hitChar_out       = NULL;
         wrap->hitGlyphNormX_out = 0.0f;
     }
     const iChar *logicalText = constData_Array(&attrText.logical);
@@ -1427,6 +1428,7 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
     const int    layoutBound        = (wrap ? wrap->maxWidth : 0);
     iBool        isFirst            = iTrue;
     const iBool  checkHitPoint      = wrap && !isEqual_I2(wrap->hitPoint, zero_I2());
+    const iBool  checkHitChar       = wrap && wrap->hitChar;
     while (!isEmpty_Range(&wrapRuns)) {
         if (isFirst) {
             isFirst = iFalse;
@@ -1446,6 +1448,11 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
             for (size_t runIndex = wrapRuns.start; runIndex < wrapRuns.end; runIndex++) {
                 const iAttributedRun *run = at_Array(&attrText.runs, runIndex);
                 if (run->flags.isLineBreak) {
+                    if (checkHitChar) {
+                        if (wrap->hitChar == sourcePtr_AttributedText_(&attrText, run->logical.start)) {
+                            wrap->hitAdvance_out = init_I2(wrapAdvance, yCursor);
+                        }
+                    }
                     wrapPosRange.end   = run->logical.start;
                     wrapResumePos      = run->logical.end;
                     wrapRuns.end       = runIndex;
@@ -1468,6 +1475,11 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
                     if (logPos < wrapPosRange.start || logPos >= wrapPosRange.end) {
                         continue;
                     }
+                    if (checkHitChar) {
+                        if (wrap->hitChar == sourcePtr_AttributedText_(&attrText, logPos)) {
+                            wrap->hitAdvance_out = init_I2(wrapAdvance, yCursor);
+                        }
+                    }
                     /* Check if the hit point is on the left side of this line. */
                     if (isHitPointOnThisLine && !wrap->hitChar_out && wrap->hitPoint.x < orig.x) {
                         wrap->hitChar_out = sourcePtr_AttributedText_(&attrText, logPos);
@@ -1723,6 +1735,9 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
         wrapPosRange.start = wrapResumePos;
         wrapPosRange.end   = textLen;
     }
+    if (checkHitChar && wrap->hitChar == args->text.end) {
+        wrap->hitAdvance_out = init_I2(xCursor, yCursor);
+    }
     if (endsWith_Rangecc(args->text, "\n")) {
         /* FIXME: This is a kludge, the wrap loop should handle this case, too. */
         /* The last wrap is an empty newline wrap. */
-- 
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