And implemented caret motions in the hit test examples.

darwin/drawtext.m

@@ -349,8 +349,7 @@ void uiDrawTextLayoutByteRangeToRectangle(uiDrawTextLayout *tl, size_t start, si
 	for (i = 0; i < tl->nLines; i++) {
 		line = (CTLineRef) CFArrayGetValueAtIndex(tl->lines, i);
 		range = CTLineGetStringRange(line);
-		// TODO explain this check
-		if (range.location >= start)
+		if (start >= range.location && start < (range.location + range.length))
 			break;
 	}
 	if (i == tl->nLines)

examples/drawtext/basic.c

@@ -253,6 +253,7 @@ struct example *mkBasicExample(void)
 	basicExample.name = "Basic Paragraph of Text";
 	basicExample.panel = uiControl(panel);
 	basicExample.draw = draw;
+	basicExample.mouse = NULL;
 
 	attrstr = uiNewAttributedString(text);
 

examples/drawtext/drawtext.h

@@ -7,7 +7,8 @@ struct example {
 	const char *name;
 	uiControl *panel;
 	void (*draw)(uiAreaDrawParams *p);
-	// TODO mouse and key?
+	void (*mouse)(uiAreaMouseEvent *e);
+	// TODO key?
 };
 
 // main.c

examples/drawtext/hittest.c

@@ -133,6 +133,28 @@ static void draw(uiAreaDrawParams *p)
 	uiDrawFreeTextLayout(layout);
 }
 
+static void mouse(uiAreaMouseEvent *e)
+{
+	uiDrawTextLayout *layout;
+	uiDrawTextLayoutHitTestResult res;
+
+	if (e->Down != 1)
+		return;
+
+	layout = uiDrawNewTextLayout(attrstr,
+		&defaultFont,
+		e->AreaWidth - 2 * margins);
+	uiDrawTextLayoutHitTest(layout,
+		e->X - margins, e->Y - margins,
+		&res);
+	uiDrawFreeTextLayout(layout);
+
+	// TODO make a label and set it
+
+	cursorPos = res.Pos;
+	redraw();
+}
+
 static struct example hitTestExample;
 
 // TODO share?
@@ -159,6 +181,7 @@ struct example *mkHitTestExample(void)
 	hitTestExample.name = "Hit-Testing and Grapheme Boundaries";
 	hitTestExample.panel = uiControl(panel);
 	hitTestExample.draw = draw;
+	hitTestExample.mouse = mouse;
 
 	attrstr = uiNewAttributedString(text);
 	cursorPos = uiAttributedStringLen(attrstr);

examples/drawtext/main.c

@@ -31,7 +31,8 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
 
 static void handlerMouseEvent(uiAreaHandler *a, uiArea *area, uiAreaMouseEvent *e)
 {
-	// do nothing
+	if (examples[curExample]->mouse != NULL)
+		examples[curExample]->mouse(e);
 }
 
 static void handlerMouseCrossed(uiAreaHandler *ah, uiArea *a, int left)