From 28a93ad6931f03114ebfaf0c6635fab96ffea186 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Mon, 27 Oct 2014 17:20:46 +0100
Subject: Refactor the input part

And add support for moving the canvas with cursor keys.
---
 autistdraw.c | 99 +++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 65 insertions(+), 34 deletions(-)

diff --git a/autistdraw.c b/autistdraw.c
index 258f24b..05fdfd9 100644
--- a/autistdraw.c
+++ b/autistdraw.c
@@ -657,56 +657,39 @@ export_irc (app_context_t *app)
 
 // --- Event handlers ----------------------------------------------------------
 
-static bool
-on_key (app_context_t *app, termo_key_t *key)
+static void
+move_canvas (app_context_t *app, int x, int y)
 {
-	if (key->type == TERMO_TYPE_KEYSYM && key->code.sym == TERMO_SYM_ESCAPE)
-		return false;
-
-	if (key->type == TERMO_TYPE_KEY
-	 && (key->modifiers & TERMO_KEYMOD_CTRL)
-	 && (key->code.codepoint == 'C' || key->code.codepoint == 'c'))
-		return false;
-
-	if (key->type == TERMO_TYPE_KEY && key->code.codepoint == 'e')
-	{
-		export_ansi (app);
-		return true;
-	}
+	app->corner_x += x;
+	app->corner_y += y;
 
-	if (key->type == TERMO_TYPE_KEY && key->code.codepoint == 'E')
-	{
-		export_irc (app);
-		return true;
-	}
+	app->center_x += x;
+	app->center_y += y;
 
-	if (key->type != TERMO_TYPE_MOUSE)
-		return true;
+	redraw_canvas (app);
+}
 
+static void
+on_mouse (app_context_t *app, termo_key_t *key)
+{
 	int screen_y, screen_x, button;
 	termo_mouse_event_t event;
 
 	termo_interpret_mouse (app->tk, key, &event, &button, &screen_y, &screen_x);
 	if (event != TERMO_MOUSE_PRESS && event != TERMO_MOUSE_DRAG)
-		return true;
+		return;
 
 	// Middle mouse button, or Ctrl + left mouse button, moves the canvas
 	if (button == 2 || (button == 1 && key->modifiers == TERMO_KEYMOD_CTRL))
 	{
 		if (event == TERMO_MOUSE_DRAG)
-		{
-			app->corner_x += app->move_saved_x - screen_x;
-			app->corner_y += app->move_saved_y - screen_y;
-
-			app->center_x += app->move_saved_x - screen_x;
-			app->center_y += app->move_saved_y - screen_y;
-
-			redraw_canvas (app);
-		}
+			move_canvas (app,
+				app->move_saved_x - screen_x,
+				app->move_saved_y - screen_y);
 
 		app->move_saved_x = screen_x;
 		app->move_saved_y = screen_y;
-		return true;
+		return;
 	}
 
 	uint8_t *color;
@@ -715,7 +698,7 @@ on_key (app_context_t *app, termo_key_t *key)
 	else if (button == 3)
 		color = &app->current_color_right;
 	else
-		return true;
+		return;
 
 	int canvas_x = app->corner_x + screen_x;
 	int canvas_y = app->corner_y + screen_y - TOP_BAR_CUTOFF;
@@ -732,6 +715,54 @@ on_key (app_context_t *app, termo_key_t *key)
 		int pair = (float) screen_x / COLS * PALETTE_WIDTH;
 		*color = pair + (screen_y - 1) * PALETTE_WIDTH;
 	}
+}
+
+static bool
+on_key (app_context_t *app, termo_key_t *key)
+{
+	if (key->type == TERMO_TYPE_KEYSYM)
+	{
+		if (key->code.sym == TERMO_SYM_ESCAPE)
+			return false;
+
+		if (key->modifiers)
+			return true;
+
+		switch (key->code.sym)
+		{
+		case TERMO_SYM_UP:
+			move_canvas (app, 0, -1);
+			break;
+		case TERMO_SYM_DOWN:
+			move_canvas (app, 0, 1);
+			break;
+		case TERMO_SYM_LEFT:
+			move_canvas (app, -1, 0);
+			break;
+		case TERMO_SYM_RIGHT:
+			move_canvas (app, 1, 0);
+		default:
+			break;
+		}
+		return true;
+	}
+
+	if (key->type == TERMO_TYPE_KEY)
+	{
+		if ((key->modifiers & TERMO_KEYMOD_CTRL)
+		 && (key->code.codepoint == 'C' || key->code.codepoint == 'c'))
+			return false;
+
+		if (key->modifiers)
+			return true;
+
+		if (key->code.codepoint == 'e')  export_ansi (app);
+		if (key->code.codepoint == 'E')  export_irc (app);
+		return true;
+	}
+
+	if (key->type == TERMO_TYPE_MOUSE)
+		on_mouse (app, key);
 
 	return true;
 }
-- 
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