From d4f7d26a6179034637cb302b4850c8febd5df01a Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Wed, 15 Sep 2021 22:41:49 +0200
Subject: Added handler for hyperlink clicking

---
 text.c | 39 ++++++++++++++++++++++++++++++---------
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/text.c b/text.c
index 256e804..9560edd 100644
--- a/text.c
+++ b/text.c
@@ -40,6 +40,7 @@ struct State
 	int height;
 	int pointer_x;
 	int pointer_y;
+	int follow;  // TODO: Rethink how pointer events are handled.
 	xcb_connection_t * c;
 	xcb_screen_t * s;
 	xcb_visualtype_t * v;
@@ -54,6 +55,7 @@ enum Actions
 	ACTION_ARRANGE = 1 << 1,
 	ACTION_CLOSE = 1 << 2,
 	ACTION_POINTER = 1 << 3,
+	ACTION_CLICK = 1 << 4,
 };
 
 struct Layout
@@ -67,7 +69,7 @@ int setup(struct State *);
 void finalize(struct State *, struct Layout *);
 int handle(struct State *, xcb_generic_event_t *);
 xcb_visualtype_t * find_visual(xcb_screen_t *);
-PangoAttribute * find_link_under(PangoLayout *, PangoAttrList *, int, int);
+PangoAttribute * find_link_under(struct State *, PangoLayout *, PangoAttrList *, int, int);
 void arrange(struct State *, struct Layout *, union Command[]);
 void draw(struct State *, struct Layout *);
 PangoAttribute * attr_hyperlink_new(const char *);
@@ -109,7 +111,7 @@ int main(int argc, const char ** argv)
 	struct State state;
 	if (-1 == setup(&state))
 	{
-		dprintf(2, "Could not connect to X server\n");  // TODO: Helpful (specific) errors.
+		dprintf(2, "Could not connect to X server\n");
 		return 1;
 	}
 	struct Layout layout = {.desc = NULL, .size = 0, .v = NULL};
@@ -120,10 +122,12 @@ int main(int argc, const char ** argv)
 		int actions = handle(&state, e);  // Obviously, right now this may have at most one action.
 		if (ACTION_CLOSE & actions)
 			break;
-		if ((ACTION_ARRANGE | ACTION_POINTER) & actions)  // TODO: Separate implementation for pointer.
+		// TODO: Arranging, rearranging and (obviously) reacting to pointer events are all different things.
+		if ((ACTION_ARRANGE | ACTION_POINTER | ACTION_CLICK) & actions)
 			arrange(&state, &layout, body);
 		if ((ACTION_REDRAW | ACTION_POINTER) & actions)
 			draw(&state, &layout);
+		state.follow = 0;
 	}
 	finalize(&state, &layout);
 }
@@ -143,7 +147,7 @@ int setup(struct State * state)
 	const uint32_t values[] = {
 		state->s->white_pixel,
 		XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_STRUCTURE_NOTIFY |
-			XCB_EVENT_MASK_POINTER_MOTION,
+			XCB_EVENT_MASK_POINTER_MOTION | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_BUTTON_PRESS,
 	};
 	xcb_create_window(
 		state->c, XCB_COPY_FROM_PARENT, state->w, state->s->root, 0, 0, initial_width, initial_height, 0,
@@ -154,6 +158,7 @@ int setup(struct State * state)
 	xcb_flush(state->c);
 	state->pointer_x = 0;
 	state->pointer_y = 0;
+	state->follow = 0;
 	return 0;
 }
 
@@ -188,6 +193,15 @@ int handle(struct State * state, xcb_generic_event_t * e)
 		state->pointer_x = motion->event_x;
 		state->pointer_y = motion->event_y;
 		break;
+	case XCB_BUTTON_PRESS:
+		break;
+	case XCB_BUTTON_RELEASE:
+		;
+		xcb_button_release_event_t * button = (xcb_button_release_event_t *) e;
+		if (1 == button->detail)
+			state->follow = 1;
+		actions |= ACTION_CLICK;
+		break;
 	case XCB_CONFIGURE_NOTIFY:
 		;
 		actions |= ACTION_ARRANGE;
@@ -221,7 +235,7 @@ xcb_visualtype_t * find_visual(xcb_screen_t * screen)
 }
 
 
-PangoAttribute * find_link_under(PangoLayout * layout, PangoAttrList * attrs, int x, int y)
+PangoAttribute * find_link_under(struct State * state, PangoLayout * layout, PangoAttrList * attrs, int x, int y)
 {
 	int index;
 	int trailing;
@@ -245,6 +259,13 @@ PangoAttribute * find_link_under(PangoLayout * layout, PangoAttrList * attrs, in
 		attr = pango_attr_foreground_new(0xffff, 0x0000, 0x0000);
 		attr->start_index = start;
 		attr->end_index = end;
+		if (state->follow)
+		{
+			state->follow = 0;
+			PangoAttribute * link = pango_attr_iterator_get(iter, PANGO_CUSTOM_ATTR_HYPERLINK);
+			if (NULL != link)
+				printf("%s\n", ((PangoAttrString *) link)->value);
+		}
 		goto done;
 	}
 done:
@@ -264,7 +285,7 @@ void arrange(struct State * state, struct Layout * layout, union Command body[])
 	if (size != layout->size)
 	{
 		for (int i = 0; i < layout->size; ++i)
-			g_object_unref(layout->v[i]);  /// TODO-maybe: Reuse already existing layouts of blocks.
+			g_object_unref(layout->v[i]);
 		layout->v = malloc(sizeof(PangoLayout *) * size);
 		if (NULL == layout->v)
 			abort();  // TODO: Be more graceful?
@@ -280,18 +301,18 @@ void arrange(struct State * state, struct Layout * layout, union Command body[])
 		{
 		case COMMAND_SPAN:
 			;
-			PangoAttribute * attr = pango_attr_foreground_new(0x0000, 0x0000, 0xffff);
+			PangoAttribute * attr = attr_hyperlink_new(c->span.uri);
 			attr->start_index = c->span.start;
 			attr->end_index = c->span.end;
 			pango_attr_list_change(attrs, attr);
-			attr = attr_hyperlink_new(c->span.uri);
+			attr = pango_attr_foreground_new(0x0000, 0x0000, 0xffff);
 			attr->start_index = c->span.start;
 			attr->end_index = c->span.end;
 			pango_attr_list_change(attrs, attr);
 			break;
 		case COMMAND_BLOCK:
 			;
-			attr = find_link_under(layout->v[i], attrs, state->pointer_x - MARGIN, state->pointer_y - MARGIN);
+			attr = find_link_under(state, layout->v[i], attrs, state->pointer_x - MARGIN, state->pointer_y - MARGIN);
 			if (NULL != attr)
 				pango_attr_list_change(attrs, attr);
 			pango_layout_set_attributes(layout->v[i], attrs);
-- 
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