From 7089b92ff5606f1e9b934e2236b0295dcab922ae Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Sat, 27 Feb 2021 23:15:43 -0500
Subject: start tab moving

---
 main.c | 18 +++++++++++-------
 node.c | 17 +++++++++++++++--
 ted.h  |  9 ++++++---
 3 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/main.c b/main.c
index 02580f0..863c574 100644
--- a/main.c
+++ b/main.c
@@ -365,6 +365,8 @@ int main(int argc, char **argv) {
 	ted->cursor_arrow = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
 	ted->cursor_resize_h = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE);
 	ted->cursor_resize_v = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS);
+	ted->cursor_hand = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
+	ted->cursor_move = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL);
 
 	Uint32 time_at_last_frame = SDL_GetTicks();
 	
@@ -724,6 +726,9 @@ int main(int argc, char **argv) {
 		}
 	#endif
 		
+		if (ted->dragging_tab_node)
+			ted->cursor = ted->cursor_move;
+
 		SDL_SetWindowTitle(window, ted->window_title);
 		SDL_SetCursor(ted->cursor);
 	
@@ -740,21 +745,20 @@ int main(int argc, char **argv) {
 
 	}
 
-	build_stop(ted);
-
-
-	if (ted->menu)
-		menu_close(ted); // free any memory used by the current menu
-
-	if (log) fclose(log);
 
 	SDL_FreeCursor(ted->cursor_arrow);
 	SDL_FreeCursor(ted->cursor_ibeam);
 	SDL_FreeCursor(ted->cursor_resize_h);
 	SDL_FreeCursor(ted->cursor_resize_v);
+	SDL_FreeCursor(ted->cursor_hand);
+	SDL_FreeCursor(ted->cursor_move);
 	SDL_GL_DeleteContext(glctx);
 	SDL_DestroyWindow(window);
 	SDL_Quit();
+	build_stop(ted);
+	if (ted->menu)
+		menu_close(ted); // free any memory used by the current menu
+	if (log) fclose(log);
 	find_close(ted);
 	tag_selector_close(ted);
 	for (u16 i = 0; i < TED_MAX_BUFFERS; ++i)
diff --git a/node.c b/node.c
index 0def1e4..b203529 100644
--- a/node.c
+++ b/node.c
@@ -96,6 +96,7 @@ static void node_join(Ted *ted, Node *node) {
 }
 
 static void node_close(Ted *ted, u16 node_idx) {
+	ted->dragging_tab_node = NULL;
 	ted->resizing_split = NULL;
 	
 	assert(node_idx < TED_MAX_NODES);
@@ -146,6 +147,8 @@ static void node_close(Ted *ted, u16 node_idx) {
 // close tab, WITHOUT checking for unsaved changes!
 // returns true if the node is still open
 static bool node_tab_close(Ted *ted, Node *node, u16 index) {
+	ted->dragging_tab_node = NULL;
+
 	u16 ntabs = (u16)arr_len(node->tabs);
 	assert(index < ntabs);
 	if (ntabs == 1) {
@@ -195,8 +198,13 @@ static void node_frame(Ted *ted, Node *node, Rect r) {
 					if (rect_contains_point(tab_bar_rect, click)) {
 						// click on tab to switch to it
 						u16 tab_index = (u16)((click.x - r.pos.x) / tab_width);
-						ted->active_node = node;
-						node_switch_to_tab(ted, node, tab_index);
+						if (tab_index >= 0 && tab_index < arr_len(node->tabs)) {
+							ted->active_node = node;
+							node_switch_to_tab(ted, node, tab_index);
+							ted->dragging_tab_node = node;
+							ted->dragging_tab_idx = tab_index;
+							ted->dragging_tab_origin = click;
+						}
 					}
 				}
 				for (u16 c = 0; c < ted->nmouse_clicks[SDL_BUTTON_MIDDLE]; ++c) {
@@ -229,6 +237,11 @@ static void node_frame(Ted *ted, Node *node, Rect r) {
 				char const *path = buffer_get_filename(buffer);
 				char const *filename = path_filename(path);
 				Rect tab_rect = rect(V2(r.pos.x + tab_width * i, r.pos.y), V2(tab_width, tab_bar_height));
+
+				if (node == ted->dragging_tab_node && i == ted->dragging_tab_idx) {
+					// make tab follow mouse
+					tab_rect.pos = v2_add(tab_rect.pos, v2_sub(ted->mouse_pos, ted->dragging_tab_origin));
+				}
 				
 				// tab border
 				gl_geometry_rect_border(tab_rect, border_thickness, colors[COLOR_BORDER]);
diff --git a/ted.h b/ted.h
index f92425f..da79178 100644
--- a/ted.h
+++ b/ted.h
@@ -277,11 +277,14 @@ typedef struct Ted {
 	// used by menus to keep track of the scroll position so we can return to it.
 	v2d prev_active_buffer_scroll;
 	
-	SDL_Cursor *cursor_arrow, *cursor_ibeam, *cursor_resize_h, *cursor_resize_v;
+	SDL_Cursor *cursor_arrow, *cursor_ibeam, *cursor_resize_h, *cursor_resize_v, *cursor_hand, *cursor_move;
 	SDL_Cursor *cursor; // which cursor to use this frame
 	
-	// index of buffer whose tab user is dragging around, 0 for none.
-	u16 dragging_tab;
+	// node containing tab user is dragging around, NULL if user is not dragging a tab
+	Node *dragging_tab_node;
+	// index in dragging_tab_node->tabs
+	u16 dragging_tab_idx;
+	v2 dragging_tab_origin; // where the tab is being dragged from (i.e. mouse pos at start of drag action)
 	
 	// if not NULL, points to the node whose split the user is currently resizing.
 	Node *resizing_split;
-- 
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