mudgangster

commit c2ebebf65776bd74bdacd97d18de328709f34b34
parent fc03b528f85e86e937e46897242f5868b199d7d5
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Sun,  3 May 2020 16:23:28 +0300

Freeze scrolling when selecting text

Diffstat:
M
src/textbox.cc
 | 
10
++++++++--
M
src/textbox.h
 | 
1
+

2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/textbox.cc b/src/textbox.cc
@@ -64,9 +64,11 @@ void textbox_add( TextBox * tb, const char * str, size_t len, Colour fg, Colour 
 }
 
 void textbox_newline( TextBox * tb ) {
+	bool freeze = tb->scroll_offset > 0 || tb->selecting;
+
 	if( tb->num_lines < tb->max_lines ) {
 		tb->num_lines++;
-		if( tb->scroll_offset > 0 )
+		if( freeze )
 			tb->scroll_offset++;
 		else
 			tb->dirty = true;
@@ -74,7 +76,7 @@ void textbox_newline( TextBox * tb ) {
 	}
 
 	tb->head++;
-	if( tb->scroll_offset > 0 )
+	if( freeze )
 		tb->scroll_offset = min( tb->scroll_offset + 1, tb->num_lines - 1 );
 	tb->dirty = true;
 
@@ -122,6 +124,7 @@ void textbox_mouse_down( TextBox * tb, int window_x, int window_y ) {
 
 	tb->selecting = true;
 	tb->selecting_and_mouse_moved = false;
+	tb->scroll_down_after_selecting = tb->scroll_offset == 0;
 	tb->selection_start_col = col;
 	tb->selection_start_row = row;
 	tb->selection_end_col = col;
@@ -257,6 +260,9 @@ void textbox_mouse_up( TextBox * tb, int window_x, int window_y ) {
 
 	tb->selecting = false;
 	tb->dirty = true;
+
+	if( tb->scroll_down_after_selecting )
+		tb->scroll_offset = 0;
 }
 
 void textbox_set_pos( TextBox * tb, int x, int y ) {
diff --git a/src/textbox.h b/src/textbox.h
@@ -27,6 +27,7 @@ struct TextBox {
 
 	bool selecting;
 	bool selecting_and_mouse_moved;
+	bool scroll_down_after_selecting;
 	int selection_start_col, selection_start_row;
 	int selection_end_col, selection_end_row;