From 8986c18f698c128089d5e2961dd650bb9bf8a3dc Mon Sep 17 00:00:00 2001
From: Manuel Bachmann <manuel.bachmann@open.eurogiciel.org>
Date: Fri, 18 Apr 2014 12:50:14 +0200
Subject: [PATCH] editor: react on Enter, Tab, and Up-Down arrow keys

The editor will now insert new lines and tabulations when
pressing the corresponding keys on the virtual keyboard.

The Up and Down arrows can be used to navigate through
lines.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=77496

Signed-off-by: Manuel Bachmann <manuel.bachmann@open.eurogiciel.org>
---
 clients/editor.c | 97 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 87 insertions(+), 10 deletions(-)

diff --git a/clients/editor.c b/clients/editor.c
index 76e2346a..4797e472 100644
--- a/clients/editor.c
+++ b/clients/editor.c
@@ -110,6 +110,47 @@ utf8_next_char(const char *p)
 	return NULL;
 }
 
+static void
+move_up(const char *p, uint32_t *cursor)
+{
+	const char *posr, *posr_i;
+	char text[16];
+
+	xkb_keysym_to_utf8(XKB_KEY_Return, text, sizeof(text));
+
+	posr = strstr(p, text);
+	while (posr) {
+		if (*cursor > (unsigned)(posr-p)) {
+			posr_i = strstr(posr+1, text);
+			if (!posr_i || !(*cursor > (unsigned)(posr_i-p))) {
+				*cursor = posr-p;
+				break;
+			}
+			posr = posr_i;
+		} else {
+			break;
+		}
+	}
+}
+
+static void
+move_down(const char *p, uint32_t *cursor)
+{
+	const char *posr;
+	char text[16];
+
+	xkb_keysym_to_utf8(XKB_KEY_Return, text, sizeof(text));
+
+	posr = strstr(p, text);
+	while (posr) {
+		if (*cursor <= (unsigned)(posr-p)) {
+			*cursor = posr-p + 1;
+			break;
+		}
+		posr = strstr(posr+1, text);
+	}
+}
+
 static void text_entry_redraw_handler(struct widget *widget, void *data);
 static void text_entry_button_handler(struct widget *widget,
 				      struct input *input, uint32_t time,
@@ -374,6 +415,23 @@ text_input_keysym(void *data,
 		return;
 	}
 
+	if (key == XKB_KEY_Up ||
+	    key == XKB_KEY_Down) {
+		if (state != WL_KEYBOARD_KEY_STATE_RELEASED)
+			return;
+
+		if (key == XKB_KEY_Up)
+			move_up(entry->text, &entry->cursor);
+		else
+			move_down(entry->text, &entry->cursor);
+
+		if (!(modifiers & entry->keysym.shift_mask))
+			entry->anchor = entry->cursor;
+		widget_schedule_redraw(entry->widget);
+
+		return;
+	}
+
 	if (key == XKB_KEY_BackSpace) {
 		const char *start, *end;
 
@@ -395,17 +453,20 @@ text_input_keysym(void *data,
 		return;
 	}
 
-	switch (key) {
-		case XKB_KEY_Tab:
-			key_label = "Tab";
-			break;
-		case XKB_KEY_KP_Enter:
-		case XKB_KEY_Return:
-			key_label = "Enter";
-			break;
-	}
+	if (key == XKB_KEY_Tab ||
+	    key == XKB_KEY_KP_Enter ||
+	    key == XKB_KEY_Return) {
+		char text[16];
 
-	fprintf(stderr, "%s key was %s.\n", key_label, state_label);
+		if (state != WL_KEYBOARD_KEY_STATE_RELEASED)
+			return;
+
+		xkb_keysym_to_utf8(key, text, sizeof(text));
+
+		text_entry_insert_at_cursor(entry, text, 0, 0);
+
+		return;
+	}
 }
 
 static void
@@ -1208,6 +1269,22 @@ key_handler(struct window *window,
 				widget_schedule_redraw(entry->widget);
 			}
 			break;
+		case XKB_KEY_Up:
+			text_entry_commit_and_reset(entry);
+
+			move_up(entry->text, &entry->cursor);
+			if (!(input_get_modifiers(input) & MOD_SHIFT_MASK))
+				entry->anchor = entry->cursor;
+			widget_schedule_redraw(entry->widget);
+			break;
+		case XKB_KEY_Down:
+			text_entry_commit_and_reset(entry);
+
+			move_down(entry->text, &entry->cursor);
+			if (!(input_get_modifiers(input) & MOD_SHIFT_MASK))
+				entry->anchor = entry->cursor;
+			widget_schedule_redraw(entry->widget);
+			break;
 		case XKB_KEY_Escape:
 			break;
 		default: