multiline caret and selection support

blendish.h

@@ -1208,6 +1208,9 @@ static double bnd_fmax ( double a, double b )
 // max glyphs for position testing
 #define BND_MAX_GLYPHS 1024
 
+// max rows for position testing
+#define BND_MAX_ROWS 32
+
 // text distance from bottom
 #define BND_TEXT_PAD_DOWN 7
 
@@ -2171,6 +2174,23 @@ void bndNodeIconLabel(NVGcontext *ctx, float x, float y, float w, float h,
     }
 }
 
+static void bndCaretPosition(NVGcontext *ctx, float x, float y, float w,
+	float *bounds, float lineHeight, const char *c, NVGtextRow *rows,
+	int nrows, int *cr, float *cx, float *cy) {
+	static NVGglyphPosition glyphs[BND_MAX_GLYPHS];
+	int r,nglyphs;
+	for (r=0; r < nrows && rows[r].end < c; ++r);
+	*cr = r;
+	*cx = rows[r].minx;
+	*cy = bounds[1]+r*lineHeight;
+	nglyphs = nvgTextGlyphPositions(
+		ctx, x, y, rows[r].start, rows[r].end+1, glyphs, BND_MAX_GLYPHS);
+	for (int i=0; i < nglyphs; ++i) {
+		*cx=glyphs[i].x;
+		if (glyphs[i].str == c) break;
+	}
+}
+
 void bndIconLabelCaret(NVGcontext *ctx, float x, float y, float w, float h,
     int iconid, NVGcolor color, float fontsize, const char *label, 
     NVGcolor caretcolor, int cbegin, int cend) {
@@ -2194,70 +2214,45 @@ void bndIconLabelCaret(NVGcontext *ctx, float x, float y, float w, float h,
     w -= BND_TEXT_RADIUS+pleft;
 
     if (cend >= cbegin) {
-#if 1
-        float c0,c1;
-        const char *cb;const char *ce;
-        static NVGglyphPosition glyphs[BND_MAX_GLYPHS];
-        int nglyphs = nvgTextGlyphPositions(
-            ctx, x, y, label, label+cend+1, glyphs, BND_MAX_GLYPHS);
-        c0=glyphs[0].x;
-        c1=glyphs[nglyphs-1].x;
-        cb = label+cbegin; ce = label+cend;
-        // TODO: this is slow
-        for (int i=0; i < nglyphs; ++i) {
-            if (glyphs[i].str == cb)
-                c0 = glyphs[i].x;
-            if (glyphs[i].str == ce)
-                c1 = glyphs[i].x;
-        }
+		int c0r,c1r;
+		float c0x,c0y,c1x,c1y;
+		float asc,desc,lh;
+		static NVGtextRow rows[BND_MAX_ROWS];
+		int nrows = nvgTextBreakLines(
+			ctx, label, label+cend+1, w, rows, BND_MAX_ROWS);
+		nvgTextBoxBounds(ctx, x, y, w, label, NULL, bounds);
+		nvgTextMetrics(ctx, &asc, &desc, &lh);
+
+		bndCaretPosition(ctx, x, y, w, bounds, lh, label+cbegin,
+			rows, nrows, &c0r, &c0x, &c0y);
+		bndCaretPosition(ctx, x, y, w, bounds, lh, label+cend,
+			rows, nrows, &c1r, &c1x, &c1y);
         
-        nvgTextBounds(ctx,x,y,label,NULL, bounds);
         nvgBeginPath(ctx);
         if (cbegin == cend) {
             nvgFillColor(ctx, nvgRGBf(0.337,0.502,0.761));
-            nvgRect(ctx, c0-1, bounds[1], 2, bounds[3]-bounds[1]);
+            nvgRect(ctx, c0x-1, c0y, 2, lh+1);
         } else {
             nvgFillColor(ctx, caretcolor);
-            nvgRect(ctx, c0-1, bounds[1], c1-c0+1, bounds[3]-bounds[1]);
+			if (c0r == c1r) {
+				nvgRect(ctx, c0x-1, c0y, c1x-c0x+1, lh+1);
+			} else {
+				int blk;
+				float by;
+				if (c0r < c1r) {
+					nvgRect(ctx, c0x-1, c0y, bounds[2]-c0x+1, lh+1);
+					nvgRect(ctx, bounds[0], c1y, c1x-bounds[0]+1, lh+1);
+					blk=c1r-c0r-1; by=c0y+lh;
+				} else {
+					nvgRect(ctx, c1x-1, c1y, bounds[2]-c1x+1, lh+1);
+					nvgRect(ctx, bounds[0], c0y, c0x-bounds[0]+1, lh+1);
+					blk=c0r-c1r-1; by=c1y+lh;
+				}
+				if (blk)
+					nvgRect(ctx, bounds[0], by, bounds[2]-bounds[0], blk*lh+1);
+			}
         }
         nvgFill(ctx);
-#else
-        float c0,c1;
-        const char *cb;
-        const char *ce;
-        const char *line;
-        int numlines;
-        cb = label+cbegin; ce = label+cend;
-        line = label;
-
-        NVGtextRow rows[2];
-        numlines = nvgTextBreakLines(ctx, line, NULL, w, rows, 2);
-
-        /*
-        int nglyphs = nvgTextGlyphPositions(
-            ctx, x, y, label, label+cend+1, glyphs, BND_MAX_GLYPHS);
-        c0=glyphs[0].x;
-        c1=glyphs[nglyphs-1].x;
-        // TODO: this is slow
-        for (int i=0; i < nglyphs; ++i) {
-            if (glyphs[i].str == cb)
-                c0 = glyphs[i].x;
-            if (glyphs[i].str == ce)
-                c1 = glyphs[i].x;
-        }
-
-        nvgTextBounds(ctx,x,y,label,NULL, bounds);
-        nvgBeginPath(ctx);
-        if (cbegin == cend) {
-            nvgFillColor(ctx, nvgRGBf(0.337,0.502,0.761));
-            nvgRect(ctx, c0-1, bounds[1], 2, bounds[3]-bounds[1]);
-        } else {
-            nvgFillColor(ctx, caretcolor);
-            nvgRect(ctx, c0-1, bounds[1], c1-c0+1, bounds[3]-bounds[1]);
-        }
-        nvgFill(ctx);
-        */
-#endif
     }
     
     nvgBeginPath(ctx);