more fixes for text buffer, add scrolling

src/editor/buffer.d

@@ -13,12 +13,22 @@ struct FlatBuffer
 	u64       length;
 	u64       lf_count;
 	i64       buf_pos;
+	i64       offset;
+	i64       rows;
 }
 
 struct LineBuffers
 {
 	Arena       arena;
-	u8[][] lines;
+	LineBuffer* first;
+	LineBuffer* last;
+	u64         count;
+}
+
+struct LineBuffer
+{
+	u8[]        text;
+	LineBuffer* next;
 }
 
 enum WalkDir
@@ -102,6 +112,8 @@ Insert(FlatBuffer* buffer, u8[] insert, u64 length, u64 pos)
 	buffer.length += length;
 
 	Reset(&buffer.arena);
+
+	AdjustOffset(buffer);
 }
 
 void
@@ -118,22 +130,34 @@ Insert(FlatBuffer* buffer, u8[] insert, u64 length, I64Vec2 pos)
 	Insert(buffer, insert, length, VecToPos(buffer, pos));
 }
 
+void
+GetLines(FlatBuffer* buffer, LineBuffers* linebufs, u64 length)
+{
+	GetLines(buffer, linebufs, buffer.offset, length);
+}
+
 void
 GetLines(FlatBuffer* buffer, LineBuffers* linebufs, u64 start_line, u64 length)
 {
 	assert(linebufs != null, "GetLines failure: linebufs is null");
-	u64 line_count = buffer.lf_count + 1;
-	length = length > line_count ? line_count : length;
 
 	Reset(&linebufs.arena);
-	linebufs.lines = AllocArray!(u8[])(&linebufs.arena, length);
+	linebufs.first = Alloc!(LineBuffer)(&linebufs.arena);
+	linebufs.count = 0;
 
 	i64 start = -1;
 	u64 line = 0;
-	u64 current_line = 0;
+	if(buffer.length == 0)
+	{
+		linebufs.first.text = AllocArray!(u8)(&linebufs.arena, 1);
+		linebufs.first.text[0] = 0;
+	}
+	else with(linebufs)
+	{
+		LineBuffer* current = first;
 		for(u64 i = 0; i < buffer.length; i += 1)
 		{
-		if(current_line == length)
+			if(count == length)
 			{
 				break;
 			}
@@ -145,11 +169,19 @@ GetLines(FlatBuffer* buffer, LineBuffers* linebufs, u64 start_line, u64 length)
 				continue;
 			}
 
+			if(line < start_line)
+			{
+				continue;
+			}
+
 			if(start < 0 && new_line)
 			{
-			linebufs.lines[current_line] = AllocArray!(u8)(&linebufs.arena, 1);
+				current.text = AllocArray!(u8)(&arena, 1);
-			linebufs.lines[current_line][0] = '\n';
+				current.text[0] = '\n';
-			current_line += 1;
+				count += 1;
+
+				current.next = Alloc!(LineBuffer)(&arena);
+				current = current.next;
 				continue;
 			}
 
@@ -160,17 +192,34 @@ GetLines(FlatBuffer* buffer, LineBuffers* linebufs, u64 start_line, u64 length)
 
 			if(new_line)
 			{
-			linebufs.lines[current_line] = AllocArray!(u8)(&linebufs.arena, (i-start));
+				current.text = AllocArray!(u8)(&arena, i-start);
-			linebufs.lines[current_line][0 .. i-start] = buffer.data[start .. i];
+				current.text[0 .. i-start] = buffer.data[start .. i];
-			current_line += 1;
+				count += 1;
 				start = -1;
+	
+				current.next = Alloc!(LineBuffer)(&arena);
+				current = current.next;
+
 				continue;
 			}
 
 			if(i == buffer.length-1)
 			{
-			linebufs.lines[current_line] = AllocArray!(u8)(&linebufs.arena, (buffer.length-start));
+				current.text = AllocArray!(u8)(&arena, (buffer.length-start));
-			linebufs.lines[current_line][0 .. buffer.length-start] = buffer.data[start .. buffer.length];
+				current.text[0 .. buffer.length-start] = buffer.data[start .. buffer.length];
+
+				current.next = Alloc!(LineBuffer)(&arena);
+				current = current.next;
+
+				count += 1;
+			}
+		}
+
+		if(buffer.length > 0 && buffer.data[buffer.length-1] == '\n')
+		{
+			current.text = AllocArray!(u8)(&linebufs.arena, 1);
+			current.text[0] = 0;
+			count += 1;
 		}
 	}
 }
@@ -178,6 +227,7 @@ GetLines(FlatBuffer* buffer, LineBuffers* linebufs, u64 start_line, u64 length)
 void
 Move(FlatBuffer* buffer, Input key, Modifier md)
 {
+	Logf("key: %s", key);
 	if(md & (MD.LeftShift | MD.RightShift))
 	{
 		switch(key)
@@ -254,6 +304,11 @@ Move(FlatBuffer* buffer, Input key, Modifier md)
 								break;
 							}
 
+							if(buffer.buf_pos == buffer.length)
+							{
+								break;
+							}
+
 							Walk!(WalkDir.Forward)(buffer);
 						}
 					}
@@ -275,11 +330,9 @@ Move(FlatBuffer* buffer, Input key, Modifier md)
 
 							if(buffer.data[buffer.buf_pos] == '\n')
 							{
-								Logf("1");
 								new_l += 1;
 								if(new_l == 2)
 								{
-									Logf("2");
 									Walk!(WalkDir.Forward)(buffer);
 									break;
 								}
@@ -300,6 +353,11 @@ Move(FlatBuffer* buffer, Input key, Modifier md)
 								break;
 							}
 
+							if(buffer.buf_pos == buffer.length)
+							{
+								break;
+							}
+
 							Walk!(WalkDir.Forward)(buffer);
 						}
 					}
@@ -322,10 +380,33 @@ Move(FlatBuffer* buffer, Input key, Modifier md)
 		}
 	}
 
-	Logf("%s %s", buffer.buf_pos, buffer.pos.v);
+	AdjustOffset(buffer);
+	Logf("buf_pos %s pos %s", buffer.buf_pos, buffer.pos.v);
+
 	//VerifyPosition(buffer, key, md);
 }
 
+void
+AdjustOffset(FlatBuffer* buffer)
+{
+	with(buffer)
+	{
+		i64 screen_pos = pos.y - offset;
+		i64 start = 1;
+		i64 end = rows-1;
+		if(offset > 0 && screen_pos < start)
+		{
+			Logf("rows %s offset %s adjusting by %s - %s", rows, offset, screen_pos, start);
+			offset += screen_pos - start;
+		}
+		else if(screen_pos > end)
+		{
+			Logf("rows %s offset %s adjusting by %s - %s", rows, offset, screen_pos, end);
+			offset += screen_pos - end;
+		}
+	}
+}
+
 u64
 VecToPos(FlatBuffer* buffer, I64Vec2 vec)
 {
@@ -428,79 +509,9 @@ AdjustLinePos(FlatBuffer* buffer, i64 adj)
 	}
 }
 
-pragma(inline) i64
-MoveToPrevLine(FlatBuffer* buffer)
-{
-	i64 adj = 0;
-
-	with(buffer)
-	{
-		if(pos.y == 0)
-		{
-			adj = -pos.x;
-			pos.x = 0;
-			buf_pos = 0;
-		}
-		else
-		{
-			i64 p = buf_pos;
-			if(buffer.data[p] == '\n')
-			{
-				p -= 1;
-			}
-			
-			for(; p > 0 && data[p] != '\n'; p -= 1) {}
-
-			buf_pos = p;
-			pos.y -= 1;
-			Logf("pos in line %s", PosInLine(buffer, p));
-			pos.x = PosInLine(buffer, p);
-		}
-	}
-
-	return adj;
-}
-
-pragma(inline) i64
-MoveToNextLine(FlatBuffer* buffer)
-{
-	i64 adj = 0;
-
-	with(buffer)
-	{
-		if(pos.y == lf_count)
-		{
-			Logf("upper");
-			adj = length - buf_pos;
-			pos.x += adj;
-			buf_pos += adj;
-		}
-		else
-		{
-			Logf("lower");
-			i64 p = buf_pos;
-			u8 prev = 0;
-			for(; p < length; p += 1) 
-			{ 
-				if(p > 0 && data[p-1] == '\n')
-				{
-					break;
-				}
-			}
-
-			pos.x = 0;
-			pos.y += 1;
-			buf_pos = p;
-		}	
-	}
-
-	return adj;
-}
-
 pragma(inline) void
 Walk(alias dir)(FlatBuffer* buffer)
 {
-	Logf("%s", buffer.pos.v);
 	static if(dir == WalkDir.Backward)
 	{
 		buffer.buf_pos -= 1;
@@ -514,8 +525,11 @@ Walk(alias dir)(FlatBuffer* buffer)
 			buffer.pos.x -= 1;
 		}
 
-		assert(buffer.pos.y >= 0);
+		if(buffer.pos.x < 0 || buffer.pos.y < 0)
-		assert(buffer.pos.x >= 0);
+		{
+			Logf("walked %s buf_pos %s pos %s", dir, buffer.buf_pos, buffer.pos.v);
+			assert(pos.x >= 0 && pos.y >= 0);
+		}
 	}
 	else static if(dir == WalkDir.Forward)
 	{
@@ -530,7 +544,6 @@ Walk(alias dir)(FlatBuffer* buffer)
 			buffer.pos.x += 1;
 		}
 	}
-	Logf("%s", buffer.pos.v);
 }
 
 pragma(inline) void
@@ -554,8 +567,6 @@ VerifyPosition(FlatBuffer* buffer, Input input, Modifier md)
 					p.x += 1;
 				}
 
-				Logf("%s %s", p.v, pos.v);
-
 				assert(p.y <= pos.y);
 			}
 
@@ -576,16 +587,25 @@ PosInLine(FlatBuffer* buffer, i64 pos)
 
 	i64 p = pos;
 	i64 line_pos = 0;
+	i64 skip_lf = buffer.data[pos] == '\n';
+
+	i64 lf_count = 0;
+	for(; p > 0; p -= 1, line_pos += 1) 
+	{
 		if(buffer.data[p] == '\n')
 		{
-		p -= 1;
+			if(skip_lf)
-		line_pos += 1;
-	}
-
-	for(; p > 0 && buffer.data[p] != '\n'; p -= 1, line_pos += 1) 
 			{
-		
+				skip_lf = false;
 			}
+			else
+			{
+				break;
+			}
+		}
+	}
+
+	Logf("line_pos %s", line_pos);
 
 	return line_pos;
 }

src/editor/editor.d

@@ -35,6 +35,7 @@ struct Editor
 	FlatBuffer  buf;
 	Tokenizer   tk;
 	LineBuffers linebufs;
+	i64         offset;
 
 	Vec2        cursor_pos;
 	Vec2        select_start;
@@ -276,6 +277,11 @@ HandleInputs(EditorCtx* ctx, Inputs* inputs)
 					case Input.Left:
 					case Input.Right:
 						{
+							UIPanel* p = GetFocusedPanel();
+							if(!Nil(p))
+							{
+								Move(&p.ed.buf, key, node.value.md);
+							}
 						} break;
 					default: break;
 				}

src/editor/ui.d

@@ -1131,28 +1131,43 @@ DrawLine(UIItem* item)
 	f32 x = item.rect.x0;
 	FontAtlas* atlas = &ctx.atlas_buf.atlas;
 
+	UIPanel* panel = GetFocusedPanel();
+	bool active = panel.id == item.parent.key.text;
+	bool edit_mode = EditModeActive();
+
+	Vertex* v;
+	if(item.highlighted_char >= 0 && active)
+	{
+		v = ctx.buffers[ctx.f_idx].vtx.ptr + ctx.buffers[ctx.f_idx].count;
+		AddUIIndices(ctx);
+	}
+
 	for(u64 i = 0; i < item.key.text.length && item.key.text[i] != '\0'; i += 1)
 	{
 		u8 ch = item.key.text.ptr[i];
 		if(ch < 128)
 		{
-			DrawGlyph(item, &atlas.glyphs[ch], atlas.size/ctx.text_size, &x, y, i == item.highlighted_char);
+			DrawGlyph(item, &atlas.glyphs[ch], atlas.size/ctx.text_size, &x, y, !edit_mode && i == item.highlighted_char);
 		}
 	}
 
-	if(item.highlighted_char >= 0)
+	if(v)
 	{
 		y = item.rect.y0 + 2;
 		x = item.rect.x0;
-		UIPanel* panel = GetFocusedPanel();
-		bool text_in_focus = panel.id == item.parent.key.text;
 
 		f32 adv = atlas.glyphs[' '].advance;
-		Vertex* v = ctx.buffers[ctx.f_idx].vtx.ptr + ctx.buffers[ctx.f_idx].count;
 		for(u64 i = 0; i < item.highlighted_char; i += 1)
+		{
+			if(item.key.text[i] == '\t')
+			{
+				x += adv*2;
+			}
+			else
 			{
 				x += adv;
 			}
+		}
 
 		v.dst_start.x = x;
 		v.dst_start.y = y;
@@ -1160,7 +1175,7 @@ DrawLine(UIItem* item)
 		v.dst_end.y = y + ctx.text_size - 2;
 		v.cols = Vec4(1.0);
 
-		if(text_in_focus)
+		if(edit_mode)
 		{
 			v.dst_end.x = v.dst_start.x + 2;
 		}
@@ -1175,7 +1190,6 @@ DrawGlyph(UIItem* item, Glyph* glyph, f32 scale, f32* x_pos, f32 y, bool highlig
 	UICtx* ctx = GetCtx();
 	Vertex* bg_v = null, v = null;
 	f32 h;
-	bool text_in_focus = false;
 
 	if(glyph.ch == '\t')
 	{
@@ -1203,6 +1217,11 @@ DrawGlyph(UIItem* item, Glyph* glyph, f32 scale, f32* x_pos, f32 y, bool highlig
 		v.src_end.y = glyph.atlas_bottom;
 	}
 
+	if(highlight)
+	{
+		col = Vec4(Vec3(1.0)-col.xyz, 1.0);
+	}
+
 	v.cols = col;
 
 	v.texture = 1;

src/editor/widgets.d

@@ -5,7 +5,7 @@ import ui : Nil;
 import ui;
 import editor;
 import std.format : sformat;
-import std.math.rounding : ceil;
+import std.math.rounding : ceil, floor;
 
 const UIPanel g_ui_nil_panel;
 UIPanel* g_UI_NIL_PANEL;
@@ -42,6 +42,7 @@ struct TextPart
 {
 	UIItem*   item;
 	TextPart* next;
+	u32       count;
 }
 
 UIItem*
@@ -175,26 +176,38 @@ EditorView(UIPanel* panel)
 {
 	UICtx*  ctx  = GetCtx();
 	UIItem* item = Panel(panel, UIF.Clickable);
+	Editor* ed   = panel.ed;
 
 	bool focused = panel == GetFocusedPanel();
-	u64 rows = cast(u64)ceil(item.size.y/16.0);
+
-	GetLines(&panel.ed.buf, &panel.ed.linebufs, 0, rows);
+	f32 text_size = 16.0;
-	for(u64 i = 0; i < panel.ed.linebufs.lines.length; i += 1)
+	f32 height = 0.0;
+
+	i64 rows = cast(i64)ceil(item.size.y/text_size);
+	if(ed.buf.rows != rows)
 	{
-		u8[] line = panel.ed.linebufs.lines[i];
+		Logf("editor height %s text_size %s rows %s", item.size.y, text_size, rows);
-		if(line.length > 0)
+		ed.buf.rows = rows;
-		{
-			if(panel.ed.buf.pos.y == i && focused)
-			{
-				SetHighlightedChar(panel.ed.buf.pos.x);
 	}
 
-			TextPart* tp = WrappedTextLine(line, panel.id, 16.0, i);
+	GetLines(&ed.buf, &ed.linebufs, rows);
+	u64 i = 0;
+	for(LineBuffer* buf = ed.linebufs.first; buf != null; buf = buf.next, i += 1)
+	{
+		if(buf.text.length > 0)
+		{
+			i64 line_no = i+ed.buf.offset;
+			if(ed.buf.pos.y == line_no && focused)
+			{
+				SetHighlightedChar(ed.buf.pos.x);
+			}
+
+			TextPart* tp = WrappedTextLine(buf.text, panel.id, text_size, line_no);
+			height += (text_size * tp.count);
 			if(TextClicked(tp))
 			{
 				SetFocusedPanel(panel);
 			}
-
 		}
 
 		SetHighlightedChar(-1);
@@ -242,6 +255,8 @@ WrappedTextLine(u8[] text, u8[] parent_id, f32 text_size, u64 line_no)
 	Node!(u8[])* lines = MakeMultiline(text, parent.size.x, parent_id, line_no);
 	for(Node!(u8[])* line = lines; line != null; line = line.next, tp = tp.next)
 	{
+		part.count += 1;
+
 		tp.item = Get(line.value);
 		tp.next = ScratchAlloc!(TextPart)();
 		tp.next.item = g_UI_NIL;