eeshow/gui.c: proof-of-concept implementation of jumping by glabel

What's still missing:
- don't require click to dehover
- help to find glabel on destination sheet
- help with finding glabel on current sheet
- avoid darkened overlap
- maybe indicate in/out/bidir/passive

eeshow/gui.c

@@ -22,6 +22,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <math.h>
 
 #include <cairo/cairo.h>
@@ -694,6 +695,7 @@ static void do_sheet_overlays(struct gui_ctx *ctx)
 static void go_to_sheet(struct gui_ctx *ctx, struct gui_sheet *sheet)
 {
 	aoi_dehover();
+	overlay_remove_all(&ctx->pop_overlays);
 	if (!sheet->rendered) {
 		render_sheet(sheet);
 		mark_aois(ctx, sheet);
@@ -784,6 +786,8 @@ static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event,
 			break;
 		if (ctx->showing_history)
 			hide_history(ctx);
+		overlay_remove_all(&ctx->pop_overlays);
+		redraw(ctx);
 		break;
 	case 2:
 		pan_begin(ctx, event->x, event->y);
@@ -934,6 +938,14 @@ struct glabel_aoi_ctx {
 #define	CHEAT	1
 
 
+static void glabel_dest_click(void *user)
+{
+	struct gui_sheet *sheet = user;
+
+	go_to_sheet(sheet->ctx, sheet);
+}
+
+
 static bool hover_glabel(void *user, bool on)
 {
 	struct glabel_aoi_ctx *aoi_ctx = user;
@@ -941,20 +953,49 @@ static bool hover_glabel(void *user, bool on)
 	const struct gui_sheet *curr_sheet = ctx->curr_sheet;
 	const struct dwg_bbox *bbox = &aoi_ctx->bbox;
 
-	if (on) {
+	if (!on) {
+		overlay_remove(&ctx->pop_overlays, aoi_ctx->over);
+		redraw(ctx);
+		return 1;
+	}
+
 	GtkAllocation alloc;
-		struct overlay_style style = overlay_style_default;
+	struct overlay_style style = {
+		.font	= BOLD_FONT,
+		.wmin	= 100,
+		.wmax	= 100,
+		.radius	= 0,
+		.pad	= 4,
+		.skip	= -4,
+		.fg	= { 0.0, 0.0, 0.0, 1.0 },
+		.bg	= { 1.0, 0.8, 0.4, 0.8 },
+		.frame	= { 1.0, 1.0, 1.0, 1.0 }, /* debugging */
+		.width	= 0,
+	};
 	int sx, sy, ex, ey, mx, my;
+	unsigned n = 0;
+	struct gui_sheet *sheet;
+	const struct sch_obj *obj;
+	struct overlay *over;
 
-		aoi_ctx->over = overlay_add(&ctx->pop_overlays, NULL,// aois
+	aoi_dehover();
-		    NULL, NULL, NULL);
+	overlay_remove_all(&ctx->pop_overlays);
-		overlay_text_raw(aoi_ctx->over, aoi_ctx->obj->u.text.s);
+	for (sheet = ctx->new_hist->sheets; sheet; sheet = sheet->next) {
-
+		n++;
-		style.radius = 0;
+		for (obj = sheet->sch->objs; obj; obj = obj->next) {
-		style.bg = RGBA(1.0, 0.8, 0.4, 0.8);
+			if (sheet == curr_sheet)
-		style.frame = RGBA(0.6, 0.0, 0.2, 0.8);
+				continue;
-
+			if (obj->type != sch_obj_glabel)
-		overlay_style(aoi_ctx->over, &style);
+				continue;
+			if (strcmp(obj->u.text.s, aoi_ctx->obj->u.text.s))
+				continue;
+			over = overlay_add(&ctx->pop_overlays,
+			    &ctx->aois, NULL, glabel_dest_click, sheet);
+			overlay_text(over, "%d %s", n, sheet->sch->title);
+			overlay_style(over, &style);
+			break;
+		}
+	}
 
 	eeschema_coord(ctx,
 	    bbox->x - curr_sheet->xmin, bbox->y - curr_sheet->ymin,
@@ -969,11 +1010,9 @@ static bool hover_glabel(void *user, bool on)
 	    sx - CHEAT : -(alloc.width - ex) + CHEAT;
 	ctx->pop_y = my < alloc.height / 2 ?
 	    sy - CHEAT : -(alloc.height - ey) + CHEAT;
-	} else {
+
-		overlay_remove(&ctx->pop_overlays, aoi_ctx->over);
-	}
 	redraw(ctx);
-	return 1;
+	return 0;
 }