renamed position_element() to layout_element()

TODO

@@ -15,10 +15,12 @@ to maintain focus until mouse release (fix scroll bars)
 [x] Implement a z index and sort command buffer based on that
     [ ] Ctx.set_z_index()
     [x] Sort command buffer on insertion
-[x] Standardize element handling, for example all buttons do almost the same thing, so write a lot of boiler plate and reuse it
+[x] Standardize element handling, for example all buttons do almost the same thing, so write a lot 
-[x] The id combination in gen_id() uses an intger division, which is costly, use another combination function that is non-linear and doesn't use division
+    of boiler plate and reuse it
+[x] The id combination in gen_id() uses an intger division, which is costly, use another combination 
+    function that is non-linear and doesn't use division
 [ ] Animations, somehow
-[ ] Maybe cache codepoint converted strings
+[x] Maybe cache codepoint converted strings
 [x] Fix scroll wheel when div is scrolled
 [ ] Be consistent with the initialization methods some are foo.new() and some are foo.init()
 [ ] Implement image loading (.bmp, .ff, .qoi and .png), in the future even lossy images like .jpg
@@ -39,18 +41,27 @@ to maintain focus until mouse release (fix scroll bars)
     each struct Elem, struct Cmd, etc. is as big as the largest element. It would
     be better to use a different allcation strategy.
 [ ] Add a way to handle time events like double clicks
-[ ] Border and padding do not go well together if the library issues two rect commands, the visible
+[x] Fix how padding is applied in push_rect. In CSS padding is applied between the border and the
-    border is effectively the border size plus the padding since there is a gap between the border 
+    content, the background color is applied starting from the border. Right now push_rect() offsets
-    rect and the internal rect. A better solution is to leave it up to the renderer to draw the rect
+    the background rect by both border and padding
-    correctly
+[ ] Investigate why the debug pointer (cyan rectangle) disappears... 
 
 ## Layout
 
 [x] Flexbox
 [ ] Center elements to the row/column
-[ ] Text wrapping / reflow
+[x] Text wrapping / reflow
+[x] Implement a better and unified way to place a glyph and get the cursor position, maybe with a struct
+[ ] Correct whitespace handling in text (\t \r etc)
 [ ] Consider a multi-pass recursive approach to layout (like https://github.com/nicbarker/clay)
     instead of the curren multi-frame approach.
+[ ] Implement column/row sizing (min, max)
+[ ] Find a way to concile pixel measurements to the mm ones used in css, for example in min/max sizing
+    of elements
+[ ] Center elements to div (center children_bounds to the center of the div bounds and shift the origin accordingly)
+[x] Use containing_rect() in position_element() to skip some computing and semplify the function
+[x] Rename position_element() to layout_element()
+[ ] Make functions to mark rows/columns as full, to fix the calculator demo
 
 ## Input
 
@@ -59,6 +70,8 @@ to maintain focus until mouse release (fix scroll bars)
 [ ] Touch input
 [x] Do not set input event to true if the movement was zero (like no mouse movement)
 [ ] Use input event flags, for example to consume the input event
+[ ] Fix bug in text box: when spamming keys you can get multiple characters in the text input field
+    of the context, this causes a bug where only the first char is actually used
 
 ## Commands
 
@@ -67,8 +80,9 @@ to maintain focus until mouse release (fix scroll bars)
     - border radius
 [x] add a command to update an atlas
 [ ] New window command, useful for popups
-[ ] Text command returns the text bounds, this way we can avoid the pattern 
+[x] Text command returns the text bounds, this way we can avoid the pattern 
     draw_text(a, pos) -> off = compute_bounds(a) -> draw_text(b, pos+off) -> ...
+[ ] Rounded rectangle with different radius for each corner
 
 ## Atlas
 
@@ -91,11 +105,6 @@ to maintain focus until mouse release (fix scroll bars)
 [x] Checkbox
 [ ] Selectable text box
 
-## Main / exaple
-
-[ ] Create maps from ids to textures and images instead of hardcoding them
-
-
 ## API
 
 [ ] Introduce a Layout structure that specifies the positioning of elements inside

lib/ugui.c3l/src/ugui_button.c3

@@ -8,112 +8,80 @@ struct ElemButton {
 }
 
 
-// draw a button, return the events on that button
+macro Ctx.button(&ctx, String label = "", String icon = "", ...)
-macro Ctx.button(&ctx, Rect size, bool state = false, ...)
+	=> ctx.button_id(@compute_id($vasplat), label, icon);
-	=> ctx.button_id(@compute_id($vasplat), size, state);
+fn ElemEvents? Ctx.button_id(&ctx, Id id, String label, String icon)
-fn ElemEvents? Ctx.button_id(&ctx, Id id, Rect size, bool active)
 {
 	id = ctx.gen_id(id)!;
-
 	Elem *parent = ctx.get_parent()!;
 	Elem *elem = ctx.get_elem(id, ETYPE_BUTTON)!;
-	Style* style_norm = ctx.styles.get_style(@str_hash("button"));
+	Style* style = ctx.styles.get_style(@str_hash("button"));
+	
+	Sprite* sprite = icon != "" ? ctx.sprite_atlas.get(icon)! : &&(Sprite){};
 
-	elem.bounds = ctx.position_element(parent, size, style_norm);
+	Rect min_size = {0, 0, style.size, style.size};
-
-	// if the bounds are null the element is outside the div view,
-	//  no interaction should occur so just return
-	if (elem.bounds.is_null()) { return {}; }
-
-	Style* style_active = ctx.styles.get_style(@str_hash("button-active"));
-
-	elem.events = ctx.get_elem_events(elem);
-	bool is_active = active || ctx.elem_focus(elem) || elem.events.mouse_hover;
-
-	// Draw the button
-	ctx.push_rect(elem.bounds, parent.div.z_index, is_active ? style_active : style_norm)!;
-
-	return elem.events;
-}
-
-macro Ctx.button_label(&ctx, String label, Rect size = {0,0,short.max,short.max}, bool active = false, ...)
-	=> ctx.button_label_id(@compute_id($vasplat), label, size, active);
-fn ElemEvents? Ctx.button_label_id(&ctx, Id id, String label, Rect size, bool active)
-{
-	id = ctx.gen_id(id)!;
-
-	Elem *parent = ctx.get_parent()!;
-	Elem *elem = ctx.get_elem(id, ETYPE_BUTTON)!;
-
-	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
 	Rect text_size = ctx.get_text_bounds(label)!;
-	Rect btn_size = text_size.add({0,0,10,10});
+	Rect icon_size = sprite.rect();
-	Style* style_norm = ctx.styles.get_style(@str_hash("button"));
-
-	// 2. Layout
-	elem.bounds = ctx.position_element(parent, btn_size, style_norm);
-	if (elem.bounds.is_null()) { return {}; }
-
-	Style* style_active = ctx.styles.get_style(@str_hash("button-active"));
 
+	ushort h_lh = (ushort)(ctx.font.line_height() / 2);
+	ushort left_pad = label != "" ? h_lh : 0;
+	ushort inner_pad = label != "" && icon != "" ? h_lh : 0;
+	ushort right_pad = left_pad;
+	
+	/*    |left_pad
+	 * +--v-----------------------------------+
+	 * |<->+--------+                         |
+	 * |   |        |   +-----------------+   |
+	 * |   |  icon  |   |     label       |   |
+	 * |   |        |   +-----------------+   |
+	 * |   +--------+<->|                 |<->|
+	 * +-------------^--------------------^---+
+	 *               |inner_pad           |right_pad
+	 */
+	
+	Rect tot_size = {
+		.w = (short)max(min_size.w, icon_size.w + text_size.w + left_pad + inner_pad + right_pad),
+		.h = (short)max(min_size.h, max(icon_size.h, text_size.h)),
+	};
+	
+	elem.bounds = ctx.layout_element(parent, tot_size, style);
+	if (elem.bounds.is_null()) return {};
 	elem.events = ctx.get_elem_events(elem);
-
+	Rect content_bounds = elem.content_bounds(style);
-	bool is_active = active || ctx.elem_focus(elem) || elem.events.mouse_hover;
+	
-	Style* style = is_active ? style_active : style_norm;
+	Rect text_bounds = {
-
+		.x = content_bounds.x + icon_size.w + left_pad + inner_pad,
-	// Draw the button
+		.y = content_bounds.y,
-	text_size.x = elem.bounds.x;
+		.w = content_bounds.w - icon_size.w - left_pad - inner_pad - right_pad,
-	text_size.y = elem.bounds.y;
+		.h = content_bounds.h
-	Point off = ctx.center_text(text_size, elem.bounds);
+	};
-	text_size.x += off.x;
+	text_bounds = text_size.center_to(text_bounds);
-	text_size.y += off.y;
+	
-	ctx.push_rect(elem.bounds, parent.div.z_index, style)!;
+	Rect icon_bounds = {
-	ctx.push_string(text_size, label, parent.div.z_index, style.fg)!;
+		.x = content_bounds.x,
-
+		.y = content_bounds.y,
-	return elem.events;
+		.w = icon_size.w + right_pad + inner_pad,
-}
+		.h = (short)max(icon_size.h, content_bounds.h)
-
+	};
-macro Ctx.button_icon(&ctx, String icon, String on_icon = "", bool active = false, ...)
+	icon_bounds = icon_size.center_to(icon_bounds);
-	=> ctx.button_icon_id(@compute_id($vasplat), icon, on_icon, active);
+	
-fn ElemEvents? Ctx.button_icon_id(&ctx, Id id, String icon, String on_icon, bool active)
+	bool is_active = ctx.elem_focus(elem) || elem.events.mouse_hover;
-{
+	Style s = *style;
-	id = ctx.gen_id(id)!;
+	if (is_active) {
-
+		s.secondary = s.primary;
-	Elem *parent = ctx.get_parent()!;
+		s.bg = s.accent;
-	Elem *elem = ctx.get_elem(id, ETYPE_BUTTON)!;
-
-	Sprite* def_sprite = ctx.sprite_atlas.get(icon)!;
-	Sprite* on_sprite = ctx.sprite_atlas.get(on_icon) ?? &&(Sprite){};
-	Rect max_size = def_sprite.rect().max(on_sprite.rect());
-
-	Style* style_norm = ctx.styles.get_style(@str_hash("button"));
-
-	elem.bounds = ctx.position_element(parent, max_size, style_norm);
-
-	// if the bounds are null the element is outside the div view,
-	//  no interaction should occur so just return
-	if (elem.bounds.is_null()) { return {}; }
-
-	Style* style_active = ctx.styles.get_style(@str_hash("button-active"));
-
-	elem.events = ctx.get_elem_events(elem);
-
-	bool is_active = active || ctx.elem_focus(elem) || elem.events.mouse_hover;
-	Style* style = is_active ? style_active : style_norm;
-
-	Id tex_id = ctx.sprite_atlas.id;
-	if (active && on_icon != "") {
-		ctx.push_sprite(elem.bounds, on_sprite.uv(), tex_id, parent.div.z_index, type: on_sprite.type)!;
-	} else {
-		ctx.push_sprite(elem.bounds, def_sprite.uv(), tex_id, parent.div.z_index, type: def_sprite.type)!;
 	}
 
-	// Draw the button
+	ctx.push_rect(elem.bounds, parent.div.z_index, &s)!;
-	ctx.push_rect(elem.bounds, parent.div.z_index, style)!;
+	ctx.push_sprite(icon_bounds, sprite.uv(), ctx.sprite_atlas.id, parent.div.z_index, type: sprite.type)!;
-
+//	Style ss = {.bg = 0x000000ffu.@to_rgba()};
+//	ctx.push_rect(content_bounds, parent.div.z_index, &ss)!;
+	ctx.push_string(text_bounds, label, parent.div.z_index, style.fg)!;
+	
 	return elem.events;
 }
 
+
 // FIXME: this should be inside the style
 macro Ctx.checkbox(&ctx, String desc, Point off, bool* active, String tick_sprite = {}, ...)
 	=> ctx.checkbox_id(@compute_id($vasplat), desc, off, active, tick_sprite);
@@ -126,7 +94,7 @@ fn void? Ctx.checkbox_id(&ctx, Id id, String description, Point off, bool* activ
 	Style* style = ctx.styles.get_style(@str_hash("checkbox"));
 
 	Rect size = {off.x, off.y, style.size, style.size};
-	elem.bounds = ctx.position_element(parent, size, style);
+	elem.bounds = ctx.layout_element(parent, size, style);
 
 	// if the bounds are null the element is outside the div view,
 	//  no interaction should occur so just return
@@ -165,7 +133,7 @@ fn void? Ctx.toggle_id(&ctx, Id id, String description, Point off, bool* active)
 	Style* style = ctx.styles.get_style(@str_hash("toggle"));
 
 	Rect size = {off.x, off.y, style.size*2, style.size};
-	elem.bounds = ctx.position_element(parent, size, style);
+	elem.bounds = ctx.layout_element(parent, size, style);
 
 	// if the bounds are null the element is outside the div view,
 	//  no interaction should occur so just return

lib/ugui.c3l/src/ugui_cmd.c3

@@ -93,17 +93,17 @@ fn void? Ctx.push_scissor(&ctx, Rect rect, int z_index)
 fn void? Ctx.push_rect(&ctx, Rect rect, int z_index, Style* style)
 {
 	Rect border        = style.border;
-	Rect padding       = style.padding;
 	ushort radius      = style.radius;
 	Color bg           = style.bg;
 	Color border_color = style.secondary;
 
+	// FIXME: this implies that the border has to be uniform
 	if (!border.is_null()) {
 		Cmd cmd = {
 			.type = CMD_RECT,
 			.rect.rect = rect,
 			.rect.color = border_color,
-			.rect.radius = radius,
+			.rect.radius = radius + border.x,
 		};
 		ctx.push_cmd(&cmd, z_index)!;
 	}
@@ -111,10 +111,10 @@ fn void? Ctx.push_rect(&ctx, Rect rect, int z_index, Style* style)
 	Cmd cmd = {
 		.type = CMD_RECT,
 		.rect.rect = {
-			.x = rect.x + border.x + padding.x,
+			.x = rect.x + border.x,
-			.y = rect.y + border.y + padding.y,
+			.y = rect.y + border.y,
-			.w = rect.w - (border.x+border.w) - (padding.x+padding.w),
+			.w = rect.w - (border.x+border.w),
-			.h = rect.h - (border.y+border.h) - (padding.y+padding.h),
+			.h = rect.h - (border.y+border.h),
 		},
 		.rect.color = bg,
 		.rect.radius = radius,
@@ -123,6 +123,7 @@ fn void? Ctx.push_rect(&ctx, Rect rect, int z_index, Style* style)
 	ctx.push_cmd(&cmd, z_index)!;
 }
 
+// TODO: accept a Sprite* instead of all this shit
 fn void? Ctx.push_sprite(&ctx, Rect bounds, Rect texture, Id texture_id, int z_index, Color hue = 0xffffffffu.to_rgba(), SpriteType type = SPRITE_NORMAL)
 {
 	Cmd cmd = {
@@ -136,56 +137,30 @@ fn void? Ctx.push_sprite(&ctx, Rect bounds, Rect texture, Id texture_id, int z_i
 	ctx.push_cmd(&cmd, z_index)!;
 }
 
-fn void? Ctx.push_string(&ctx, Rect bounds, char[] text, int z_index, Color hue)
+// TODO: do not return the WHOLE TextInfo but instead something smaller
+fn TextInfo? Ctx.push_string(&ctx, Rect bounds, char[] text, int z_index, Color hue, bool reflow = false)
 {
 	if (text.len == 0) {
-		return;
+		return {};
 	}
 
 	ctx.push_scissor(bounds, z_index)!;
 
-	short baseline = (short)ctx.font.ascender;
-	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
-	short line_gap = (short)ctx.font.linegap;
 	Id texture_id = ctx.font.id;  // or ctx.font.atlas.id
-	Point orig = {
+	Rect text_bounds = {bounds.x, bounds.y, 0, 0};
-		.x = bounds.x,
-		.y = bounds.y,
-	};
 
-	short line_len;
+	TextInfo ti;
-	Codepoint cp;
+	ti.init(&ctx.font, (String)text, bounds);
-	usz off, x;
+
-	while (off < text.len && (cp = str_to_codepoint(text[off..], &x)) != 0) {
+	while (ti.place_glyph(reflow)!) {
-		off += x;
+		if (!cull_rect(ti.glyph_bounds, bounds)) {
-		Glyph* gp;
+			ctx.push_sprite(ti.glyph_bounds, ti.glyph_uv, texture_id, z_index, hue)!;
-		if (!ascii::is_cntrl((char)cp)) {
-			gp = ctx.font.get_glyph(cp)!;
-			Rect gb = {
-				.x = orig.x + line_len + gp.ox,
-				.y = orig.y + gp.oy + baseline,
-				.w = gp.w,
-				.h = gp.h,
-			};
-			Rect gt = {
-				.x = gp.u,
-				.y = gp.v,
-				.w = gp.w,
-				.h = gp.h,
-			};
-			// push the sprite only if it collides with the bounds
-			if (!cull_rect(gb, bounds)) ctx.push_sprite(gb, gt, texture_id, z_index, hue)!;
-			line_len += gp.adv;
-		} else if (cp == '\n'){
-			orig.y += line_height + line_gap;
-			line_len = 0;
-		} else {
-			continue;
 		}
 	}
-
+	
-	// FIXME: we never get here if an error was thrown before
 	ctx.push_scissor({}, z_index)!;
+
+	return ti;
 }
 
 fn void? Ctx.push_update_atlas(&ctx, Atlas* atlas)

lib/ugui.c3l/src/ugui_core.c3

@@ -65,7 +65,7 @@ alias ElemCache = cache::Cache{Id, Elem, MAX_ELEMENTS};
 
 alias CmdQueue = fifo::Fifo{Cmd};
 
-faultdef INVALID_SIZE, EVENT_UNSUPPORTED, UNEXPECTED_ELEMENT, WRONG_ELEMENT_TYPE, WRONG_ID;
+faultdef INVALID_SIZE, EVENT_UNSUPPORTED, WRONG_ELEMENT_TYPE, WRONG_ID;
 
 const Rect DIV_FILL = { .x = 0, .y = 0, .w = 0, .h = 0 };
 
@@ -117,7 +117,10 @@ struct Ctx {
 fn Elem*? Ctx.get_parent(&ctx)
 {
 	Id parent_id = ctx.tree.get(ctx.active_div)!;
-	return ctx.cache.search(parent_id);
+	Elem*? parent = ctx.cache.search(parent_id);
+	if (catch parent) return parent;
+	if (parent.type != ETYPE_DIV) return WRONG_ELEMENT_TYPE?;
+	return parent; 
 }
 
 macro @bits(#a) => $typeof(#a).sizeof*8;
@@ -250,7 +253,7 @@ fn void? Ctx.frame_end(&ctx)
 {
 	// FIXME: this is not guaranteed to be root. the user might forget to close a div or some other element
 	Elem* root = ctx.get_active_div()!;
-	root.div.layout = LAYOUT_ROW;
+	if (root.id != ROOT_ID) return WRONG_ID?;
 
 	// 1. clear the tree
 	ctx.tree.nuke();

lib/ugui.c3l/src/ugui_div.c3

@@ -34,8 +34,8 @@ fn void? Ctx.div_begin_id(&ctx, Id id, Rect size, bool scroll_x, bool scroll_y)
 {
 	id = ctx.gen_id(id)!;
 
-	Elem* parent = ctx.get_parent()!;
 	Elem* elem = ctx.get_elem(id, ETYPE_DIV)!;
+	Elem* parent = ctx.get_parent()!;
 	ctx.active_div = elem.tree_idx;
 
 	Style* style = ctx.styles.get_style(@str_hash("default"));
@@ -53,7 +53,7 @@ fn void? Ctx.div_begin_id(&ctx, Id id, Rect size, bool scroll_x, bool scroll_y)
 		.w = size.w < 0 ? max(elem.div.pcb.w, (short)-size.w) : size.w,
 		.h = size.h < 0 ? max(elem.div.pcb.h, (short)-size.h) : size.h,
 	};
-	elem.bounds = ctx.position_element(parent, wanted_size, style);
+	elem.bounds = ctx.layout_element(parent, wanted_size, style);
 	elem.div.children_bounds = {};
 
 	// update the ctx scissor
@@ -81,7 +81,6 @@ fn void? Ctx.div_begin_id(&ctx, Id id, Rect size, bool scroll_x, bool scroll_y)
 fn void? Ctx.div_end(&ctx)
 {
 	// swap the children bounds
-	Elem* parent = ctx.get_parent()!;
 	Elem* elem = ctx.get_active_div()!;
 	elem.div.pcb = elem.div.children_bounds;
 
@@ -150,4 +149,7 @@ fn void? Ctx.div_end(&ctx)
 
 	// the active_div returns to the parent of the current one
 	ctx.active_div = ctx.tree.parentof(ctx.active_div)!;
+	Elem* parent = ctx.get_parent()!;
+	// TODO: reset the scissor back to the parent div
+	ctx.div_scissor = parent.bounds;
 }

lib/ugui.c3l/src/ugui_font.c3

@@ -167,6 +167,7 @@ fn void? Ctx.load_font(&ctx, String name, ZString path, uint height, float scale
 
 <*
 @require off != null
+@require str.ptr != null
 *>
 fn Codepoint str_to_codepoint(char[] str, usz* off)
 {
@@ -179,72 +180,119 @@ fn Codepoint str_to_codepoint(char[] str, usz* off)
 	return cp;
 }
 
+const uint TAB_SIZE = 4;
+
+// TODO: change the name
+// TODO: reorder to make smaller
+struct TextInfo {
+	Font* font;
+	Rect bounds;
+	String text;
+	usz off;
+	
+	// current glyph info
+	Point origin;
+	Rect glyph_bounds;
+	Rect glyph_uv;
+	
+	// cursor info
+	usz cursor_idx;
+	Point cursor_pos;
+	
+	// current text bounds
+	Rect text_bounds;
+}
+
+<*
+@require f != null
+*>
+fn void TextInfo.init(&self, Font* f, String s, Rect bounds = RECT_MAX)
+{
+	*self = {};
+	self.font = f;
+	self.text = s;
+	self.bounds = bounds;
+	self.origin = bounds.position();
+	self.text_bounds = { .x = bounds.x, .y = bounds.y };
+}
+
+fn void TextInfo.reset(&self)
+{
+	TextInfo old = *self;
+	self.init(old.font, old.text, old.bounds);
+}
+
+fn bool? TextInfo.place_glyph(&self, bool reflow)
+{
+	if (self.off >= self.text.len) {
+		return false;
+	}
+	if (!self.origin.in_rect(self.bounds)) {
+		return false;
+	}
+
+	short baseline = (short)self.font.ascender;
+	short line_height = (short)self.font.ascender - (short)self.font.descender;
+	short line_gap = (short)self.font.linegap;
+
+	Codepoint cp;
+	Glyph* gp;
+	usz x;
+	
+	cp = str_to_codepoint(self.text[self.off..], &x);
+	if (cp == 0) return false;
+	self.off += x;
+
+	if (ascii::is_cntrl((char)cp) == false) {
+		gp = self.font.get_glyph(cp)!;
+		self.glyph_uv = {
+			.x = gp.u,
+			.y = gp.v,
+			.w = gp.w,
+			.h = gp.h,
+		};
+		self.glyph_bounds = {
+			.x = self.origin.x + gp.ox,
+			.y = self.origin.y + gp.oy + baseline,
+			.w = gp.w,
+			.h = gp.h,
+		};
+		// try to wrap the text if the charcater goes outside of the bounds
+		if (reflow && !self.bounds.contains(self.glyph_bounds)) {
+			self.origin.y += line_height + line_gap;
+			self.glyph_bounds.y += line_height + line_gap;
+
+			self.origin.x = self.bounds.x;
+			self.glyph_bounds.x = self.bounds.x;
+		}
+
+		// handle tab
+		if (cp == '\t') {
+			self.origin.x += gp.adv*TAB_SIZE;
+		} else {
+			self.origin.x += gp.adv;
+		}
+
+	} else if (cp == '\n'){
+		self.origin.y += line_height + line_gap;
+		self.origin.x = self.bounds.x;
+	}
+
+	self.text_bounds = containing_rect(self.text_bounds, self.glyph_bounds);
+
+	if (self.off == self.cursor_idx) {
+		self.cursor_pos = self.origin;
+	}
+
+	return true;
+}
+
 fn Rect? Ctx.get_text_bounds(&ctx, String text)
 {
-	Rect text_bounds;
+	TextInfo ti;
-	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
+	ti.init(&ctx.font, text);
-	short line_gap = (short)ctx.font.linegap;
+	while (ti.place_glyph(false)!);
-	text_bounds.h = line_height;
+	return ti.text_bounds;
-	Glyph* gp;
-
-	// TODO: account for unicode codepoints
-	short line_len;
-	Codepoint cp;
-	usz off, x;
-	while ((cp = str_to_codepoint(text[off..], &x)) != 0) {
-		off += x;
-		bool n;
-		if (!ascii::is_cntrl((char)cp)) {
-			gp = ctx.font.get_glyph(cp)!;
-			line_len += gp.adv;
-		} else if (cp == '\n'){
-			text_bounds.h += line_height + line_gap;
-			line_len = 0;
-		} else {
-			continue;
-		}
-		if (line_len > text_bounds.w) {
-			text_bounds.w = line_len;
-		}
-	}
-
-	return text_bounds;
-}
-
-fn Point? Ctx.get_cursor_position(&ctx, String text)
-{
-	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
-	short line_gap = (short)ctx.font.linegap;
-	Glyph* gp;
-
-	// TODO: account for unicode codepoints
-	Point line;
-	Codepoint cp;
-	usz off, x;
-	while ((cp = str_to_codepoint(text[off..], &x)) != 0) {
-		off += x;
-		bool n;
-		if (!ascii::is_cntrl((char)cp)) {
-			gp = ctx.font.get_glyph(cp)!;
-			line.x += gp.adv;
-		} else if (cp == '\n'){
-			line.y += line_height + line_gap;
-			line.x = 0;
-		} else {
-			continue;
-		}
-	}
-
-	return line;
-}
-
-
-fn Point Ctx.center_text(&ctx, Rect text_bounds, Rect bounds)
-{
-	short dw = bounds.w - text_bounds.w;
-	short dh = bounds.h - text_bounds.h;
-
-	return {.x = dw/2, .y = dh/2};
 }
 
 // TODO: check if the font is present in the context

lib/ugui.c3l/src/ugui_layout.c3

@@ -9,51 +9,25 @@ enum Layout {
 
 fn void? Ctx.layout_set_row(&ctx)
 {
-	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.get_parent()!;
-	Elem *parent = ctx.cache.search(parent_id)!;
-
-	if (parent.type != ETYPE_DIV) {
-		// what?
-		return UNEXPECTED_ELEMENT?;
-	}
-
 	parent.div.layout = LAYOUT_ROW;
 }
 
 fn void? Ctx.layout_set_column(&ctx)
 {
-	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.get_parent()!;
-	Elem *parent = ctx.cache.search(parent_id)!;
-
-	if (parent.type != ETYPE_DIV) {
-		// what?
-		return UNEXPECTED_ELEMENT?;
-	}
-
 	parent.div.layout = LAYOUT_COLUMN;
 }
 
 fn void? Ctx.layout_set_floating(&ctx)
 {
-	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.get_parent()!;
-	Elem *parent = ctx.cache.search(parent_id)!;
-
-	if (parent.type != ETYPE_DIV) {
-		// what?
-		return UNEXPECTED_ELEMENT?;
-	}
-
 	parent.div.layout = LAYOUT_FLOATING;
 }
 
 fn void? Ctx.layout_next_row(&ctx)
 {
-	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.get_parent()!;
-	Elem *parent = ctx.cache.search(parent_id)!;
-
-	if (parent.type != ETYPE_DIV) {
-		return UNEXPECTED_ELEMENT?;
-	}
 
 	parent.div.origin_r = {
 		.x = parent.bounds.x,
@@ -64,12 +38,7 @@ fn void? Ctx.layout_next_row(&ctx)
 
 fn void? Ctx.layout_next_column(&ctx)
 {
-	Id parent_id = ctx.tree.get(ctx.active_div)!;
+	Elem *parent = ctx.get_parent()!;
-	Elem *parent = ctx.cache.search(parent_id)!;
-
-	if (parent.type != ETYPE_DIV) {
-		return UNEXPECTED_ELEMENT?;
-	}
 
 	parent.div.origin_c = {
 		.x = parent.div.children_bounds.bottom_right().x,
@@ -78,6 +47,7 @@ fn void? Ctx.layout_next_column(&ctx)
 	parent.div.origin_r = parent.div.origin_c;
 }
 
+macro Rect Elem.content_bounds(&elem, style) => elem.bounds.pad(style.border).pad(style.padding);
 
 macro Rect Elem.get_view(&elem)
 {
@@ -106,7 +76,7 @@ macro Point Elem.get_view_off(&elem)
 @require ctx != null
 @require parent.type == ETYPE_DIV
 *>
-fn Rect Ctx.position_element(&ctx, Elem *parent, Rect rect, Style* style)
+fn Rect Ctx.layout_element(&ctx, Elem *parent, Rect rect, Style* style)
 {
 	ElemDiv* div = &parent.div;
 
@@ -176,16 +146,7 @@ fn Rect Ctx.position_element(&ctx, Elem *parent, Rect rect, Style* style)
 	};
 
 	// 5. Update the parent's children bounds
-	if (!child_occupied.bottom_right().in_rect(div.children_bounds)) {
+	div.children_bounds = containing_rect(div.children_bounds, child_occupied);
-		// right overflow
-		if (child_occupied.bottom_right().x > div.children_bounds.bottom_right().x) {
-			div.children_bounds.w += child_occupied.bottom_right().x - div.children_bounds.bottom_right().x;
-		}
-		// bottom overflow
-		if (child_occupied.bottom_right().y > div.children_bounds.bottom_right().y) {
-			div.children_bounds.h += child_occupied.bottom_right().y - div.children_bounds.bottom_right().y;
-		}
-	}
 
 	// 99. return the placement
 	if (child_placement.collides(parent_view)) {

lib/ugui.c3l/src/ugui_shapes.c3

@@ -10,6 +10,9 @@ struct Rect {
 	short x, y, w, h;
 }
 
+// TODO: find another name
+const Rect RECT_MAX = {0, 0, short.max, short.max};
+
 // return true if rect a contains b
 macro bool Rect.contains(Rect a, Rect b)
 {
@@ -33,6 +36,21 @@ macro bool Rect.collides(Rect a, Rect b)
 	return !(a.x > b.x+b.w || a.x+a.w < b.x || a.y > b.y+b.h || a.y+a.h < b.y);
 }
 
+// return a rect that contains both rects, a bounding box of both
+macro Rect containing_rect(Rect a, Rect b)
+{
+	short min_x = (short)min(a.x, b.x);
+	short min_y = (short)min(a.y, b.y);
+	short max_x = (short)max(a.x + a.w, b.x + b.w);
+	short max_y = (short)max(a.y + a.h, b.y + b.h);
+	return {
+		.x = min_x,
+		.y = min_y,
+		.w = (short)(max_x - min_x),
+		.h = (short)(max_y - min_y)
+	};
+}
+
 // check for empty rect
 macro bool Rect.is_null(Rect r) => r.x == 0 && r.y == 0 && r.x == 0 && r.w == 0;
 
@@ -136,6 +154,26 @@ macro Point Rect.bottom_right(Rect r)
 	};
 }
 
+macro Rect Rect.center_to(Rect a, Rect b)
+{
+	return {
+		.x = b.x + (b.w - a.w)/2,
+		.y = b.y + (b.h - a.h)/2,
+		.w = a.w,
+		.h = a.h,
+	};
+}
+
+macro Rect Rect.pad(Rect a, Rect b)
+{
+	return {
+		.x = a.x + b.x,
+		.y = a.y + b.y,
+		.w = a.w - b.x - b.w,
+		.h = a.h - b.y - b.h,
+	};
+}
+
 
 // ---------------------------------------------------------------------------------- //
 //                                    POINT                                           //

lib/ugui.c3l/src/ugui_slider.c3

@@ -28,15 +28,17 @@ fn ElemEvents? Ctx.slider_hor_id(&ctx, Id id, Rect size, float* value, float hpe
 	Style* style = ctx.styles.get_style(@str_hash("slider"));
 
 	// 2. Layout
-	elem.bounds = ctx.position_element(parent, size, style);
+	elem.bounds = ctx.layout_element(parent, size, style);
+	if (elem.bounds.is_null()) return {};
+	Rect content_bounds = elem.content_bounds(style);
 
 	// handle width
-	short hw = (short)(elem.bounds.w * hpercent);
+	short hw = (short)(content_bounds.w * hpercent);
 	Rect handle = {
-		.x = calc_slider(elem.bounds.x, elem.bounds.w-hw, *value),
+		.x = calc_slider(content_bounds.x, content_bounds.w-hw, *value),
-		.y = elem.bounds.y,
+		.y = content_bounds.y,
 		.w = hw,
-		.h = elem.bounds.h,
+		.h = content_bounds.h,
 	};
 	elem.slider.handle = handle;
 
@@ -44,8 +46,8 @@ fn ElemEvents? Ctx.slider_hor_id(&ctx, Id id, Rect size, float* value, float hpe
 	elem.events = ctx.get_elem_events(elem);
 
 	if (ctx.elem_focus(elem) && ctx.is_mouse_down(BTN_LEFT)) {
-		*value = calc_value(elem.bounds.x, m.x, elem.bounds.w, hw);
+		*value = calc_value(content_bounds.x, m.x, content_bounds.w, hw);
-		elem.slider.handle.x = calc_slider(elem.bounds.x, elem.bounds.w-hw, *value);
+		elem.slider.handle.x = calc_slider(content_bounds.x, content_bounds.w-hw, *value);
 		elem.events.update = true;
 	}
 
@@ -93,14 +95,16 @@ fn ElemEvents? Ctx.slider_ver_id(&ctx, Id id, Rect size, float* value, float hpe
 	}
 
 	// 2. Layout
-	elem.bounds = ctx.position_element(parent, size, style);
+	elem.bounds = ctx.layout_element(parent, size, style);
+	if (elem.bounds.is_null()) return {};
+	Rect content_bounds = elem.content_bounds(style);
 
 	// handle height
-	short hh = (short)(elem.bounds.h * hpercent);
+	short hh = (short)(content_bounds.h * hpercent);
 	Rect handle = {
-		.x = elem.bounds.x,
+		.x = content_bounds.x,
-		.y = calc_slider(elem.bounds.y, elem.bounds.h-hh, *value),
+		.y = calc_slider(content_bounds.y, content_bounds.h-hh, *value),
-		.w = elem.bounds.w,
+		.w = content_bounds.w,
 		.h = hh,
 	};
 	elem.slider.handle = handle;
@@ -109,8 +113,8 @@ fn ElemEvents? Ctx.slider_ver_id(&ctx, Id id, Rect size, float* value, float hpe
 	elem.events = ctx.get_elem_events(elem);
 
 	if (ctx.elem_focus(elem) && ctx.is_mouse_down(BTN_LEFT)) {
-		*value = calc_value(elem.bounds.y, m.y, elem.bounds.h, hh);
+		*value = calc_value(content_bounds.y, m.y, content_bounds.h, hh);
-		elem.slider.handle.y = calc_slider(elem.bounds.y, elem.bounds.h-hh, *value);
+		elem.slider.handle.y = calc_slider(content_bounds.y, content_bounds.h-hh, *value);
 		elem.events.update = true;
 	}
 

lib/ugui.c3l/src/ugui_sprite.c3

@@ -126,7 +126,7 @@ fn void? Ctx.sprite_id(&ctx, Id id, String name, Point off)
 	Rect uv = { sprite.u, sprite.v, sprite.w, sprite.h };
 	Rect bounds = { 0, 0, sprite.w, sprite.h };
 
-	elem.bounds = ctx.position_element(parent, bounds.off(off), style);
+	elem.bounds = ctx.layout_element(parent, bounds.off(off), style);
 	elem.sprite.id = ctx.get_sprite_atlas_id(name);
 
 	// if the bounds are null the element is outside the div view,

lib/ugui.c3l/src/ugui_style.c3

@@ -115,7 +115,10 @@ import std::io;
 enum TokenType {
 	INVALID,
 	IDENTIFIER,
-	PUNCT,
+	RCURLY,
+	LCURLY,
+	SEMICOLON,
+	COLON,
 	NUMBER,
 	COLOR,
 	EOF,
@@ -191,10 +194,16 @@ fn Token Lexer.next_token(&lex)
 
 	switch (true) {
 	case ascii::is_punct_m(lex.peep()) && lex.peep() != '#': // punctuation
-		t.type = PUNCT;
 		t.text = lex.text[lex.off:1];
 		if (lex.advance() == 0) { t.type = INVALID; break; }
-	
+		switch (t.text[0]) {
+		case ':': t.type = COLON;
+		case ';': t.type = SEMICOLON;
+		case '{': t.type = LCURLY;
+		case '}': t.type = RCURLY;
+		default:  t.type = INVALID;
+		}
+
 	case lex.peep() == '#': // color
 		t.type = COLOR;
 		if (lex.advance() == 0) { t.type = INVALID; break; }
@@ -276,17 +285,6 @@ struct Parser {
 	float mm_to_px;
 }
 
-macro bool Parser.expect_text(&p, Token* t, TokenType type, String text)
-{
-	*t = p.lex.next_token();
-	if (t.type == type && t.text == text) {
-		return true;
-	}
-	io::eprintfn("CSS parsing error at %d:%d: expected type:%s text:'%s' but got type:%s text:'%s'",
-	    t.line, t.col, type, text, t.type, t.text);
-	return false;
-}
-
 macro bool Parser.expect(&p, Token* t, TokenType type)
 {
 	*t = p.lex.next_token();
@@ -306,7 +304,7 @@ fn bool Parser.parse_style(&p)
 	p.style_id = t.text.hash();
 
 	// style body
-	if (p.expect_text(&t, PUNCT, "{") == false) return false;
+	if (p.expect(&t, LCURLY) == false) return false;
 	
 	while (true) {
 		if (p.parse_property() == false) return false;
@@ -314,7 +312,7 @@ fn bool Parser.parse_style(&p)
 		if (t.type != IDENTIFIER) break;
 	}
 	
-	if (p.expect_text(&t, PUNCT, "}") == false) return false;
+	if (p.expect(&t, RCURLY) == false) return false;
 	
 	return true;
 }
@@ -323,7 +321,7 @@ fn bool Parser.parse_property(&p)
 {
 	Token t, prop;
 	if (p.expect(&prop, IDENTIFIER) == false) return false;
-	if (p.expect_text(&t, PUNCT, ":") == false) return false;
+	if (p.expect(&t, COLON) == false) return false;
 
 	switch (prop.text) {
 	case "padding":
@@ -389,7 +387,7 @@ fn bool Parser.parse_property(&p)
 		io::eprintfn("CSS parsing error at %d:%d: '%s' is not a valid property", prop.line, prop.col, prop.text);
 		return false;
 	}
-	if (p.expect_text(&t, PUNCT, ";") == false) return false;
+	if (p.expect(&t, SEMICOLON) == false) return false;
 	return true;
 }
 
@@ -428,7 +426,7 @@ fn bool Parser.parse_size(&p, Rect* r)
 		if (p.parse_number(&x) == false) return false;
 		r.h = x;
 		return true;
-	} else if (t.type == PUNCT && t.text == ";") {
+	} else if (t.type == SEMICOLON) {
 		// just one number, all dimensions are the same
 		r.x = r.y = r.w = r.h = x;
 		return true;

lib/ugui.c3l/src/ugui_text.c3

@@ -3,8 +3,10 @@ module ugui;
 import std::io;
 
 struct ElemText {
-	char[] str;
+	String str;
 	usz cursor; // cursor offset
+	Id hash;
+	Rect bounds;
 }
 
 macro Ctx.text_unbounded(&ctx, String text, ...)
@@ -17,12 +19,15 @@ fn void? Ctx.text_unbounded_id(&ctx, Id id, String text)
 	Elem *elem = ctx.get_elem(id, ETYPE_TEXT)!;
 	Style* style = ctx.styles.get_style(@str_hash("text"));
 
+	Id text_hash = text.hash();
+	if (elem.flags.is_new || elem.text.hash != text_hash) {
+		elem.text.bounds = ctx.get_text_bounds(text)!;
+	}
 	elem.text.str = text;
+	elem.text.hash = text_hash;
 
-	// if the element is new or the parent was updated then redo layout
-	Rect text_size = ctx.get_text_bounds(text)!;
 	// 2. Layout
-	elem.bounds = ctx.position_element(parent, text_size, style);
+	elem.bounds = ctx.layout_element(parent, elem.text.bounds, style);
 	if (elem.bounds.is_null()) { return; }
 
 	ctx.push_string(elem.bounds, text, parent.div.z_index, style.fg)!;
@@ -38,10 +43,10 @@ fn ElemEvents? Ctx.text_box_id(&ctx, Id id, Rect size, char[] text, usz* text_le
 	Elem *elem = ctx.get_elem(id, ETYPE_TEXT)!;
 	Style* style = ctx.styles.get_style(@str_hash("text-box"));
 
-	elem.text.str = text;
+	elem.text.str = (String)text;
 	
 	// layout the text box
-	elem.bounds = ctx.position_element(parent, size, style);
+	elem.bounds = ctx.layout_element(parent, size, style);
 
 	// check input and update the text
 	elem.events = ctx.get_elem_events(elem);
@@ -64,27 +69,11 @@ fn ElemEvents? Ctx.text_box_id(&ctx, Id id, Rect size, char[] text, usz* text_le
 
 	// draw the box
 	short line_height = (short)ctx.font.line_height();
-	Rect text_box = elem.bounds.sub({0,0,0,line_height});
+	Rect text_box = elem.bounds;
-	Rect input_box = {
-		.x = elem.bounds.x,
-		.y = elem.bounds.y + elem.bounds.h - line_height,
-		.w = elem.bounds.w,
-		.h = line_height,
-	};
-	Rect cursor;
-	Point b = ctx.get_cursor_position((String)text[:elem.text.cursor])!;
-	cursor = {
-		.x = b.x,
-		.y = b.y,
-		.w = 3,
-		.h = line_height,
-	};
-	cursor = cursor.off(elem.bounds.position());
-
 	ctx.push_rect(text_box, parent.div.z_index, style)!;
-	ctx.push_string(text_box, text[:*text_len], parent.div.z_index, style.fg)!;
+	ctx.push_string(text_box, text[:*text_len], parent.div.z_index, style.fg, true)!;
-	ctx.push_rect(input_box, parent.div.z_index, style)!;
+	
-	ctx.push_rect(cursor, parent.div.z_index, style)!;
+	// TODO: draw cursor
 
 	return elem.events;
 }

resources/style.css

@@ -4,38 +4,27 @@ default {
 	primary: #cc241dff;
 	secondary: #458588ff;
 	accent: #fabd2fff;
+	border: 1;
 }
 
 button {
-	margin: 2 2 2 2;
+	margin: 2;
-	border: 2 2 2 2;
+	border: 2;
-	padding: 1 1 1 1;
+	padding: 2;
 	radius: 10;
+	size: 32;
 
 	bg: #3c3836ff;
 	fg: #fbf1c7ff;
 	primary: #cc241dff;
 	secondary: #458588ff;
-	accent: #fabd2fff;
+	accent: #504945ff;
-}
-
-button-active {
-	margin: 2 2 2 2;
-	border: 2 2 2 2;
-	padding: 1 1 1 1;
-	radius: 10;
-
-	bg: #504945ff;
-	fg: #fbf1c7ff;
-	primary: #cc241dff;
-	secondary: #cc241dff;
-	accent: #fabd2fff;
 }
 
 checkbox {
-	margin: 2 2 2 2;
+	margin: 2;
-	border: 2 2 2 2;
+	border: 2;
-	padding: 1 1 1 1;
+	padding: 1;
 	radius: 10;
 	size: 16;
 	bg: #3c3836ff;
@@ -46,9 +35,9 @@ checkbox {
 }
 
 toggle {
-	margin: 2 2 2 2;
+	margin: 2;
-	border: 2 2 2 2;
+	border: 2;
-	padding: 1 1 1 1;
+	padding: 1;
 	radius: 10;
 	size: 16;
 	bg: #3c3836ff;
@@ -59,9 +48,9 @@ toggle {
 }
 
 slider {
-	margin: 2 2 2 2;
+	margin: 2;
-	padding: 2 2 2 2;
+	padding: 2;
-	border: 1 1 1 1;
+	border: 1;
 	radius: 4;
 	size: 8;
 	bg: #3c3836ff;

src/main.c3

@@ -119,7 +119,6 @@ fn int main(String[] args)
 
 	isz frame;
 	double fps;
-	bool toggle = true;
 	time::Clock clock;
 	time::Clock fps_clock;
 	time::Clock sleep_clock;
@@ -199,74 +198,13 @@ fn int main(String[] args)
 
 		if (ui.check_key_combo(ugui::KMOD_CTRL, "q")) quit = true;
 
-		ui.div_begin({.w=-100})!!;
+const String APPLICATION = "calculator";
-		{
+$if APPLICATION == "debug":
-			ui.layout_set_column()!!;
+		debug_app(&ui);
-			if (ui.button({0,0,30,30}, toggle)!!.mouse_press) {
+$endif
-				io::printn("press button0");
+$if APPLICATION == "calculator":
-				toggle = !toggle;
+		calculator(&ui);
-			}
+$endif
-			//ui.layout_next_column()!!;
-			if (ui.button({0,0,30,30})!!.mouse_press) {
-				io::printn("press button1");
-			}
-			//ui.layout_next_column()!!;
-			if (ui.button({0,0,30,30})!!.mouse_release) {
-				io::printn("release button2");
-			}
-
-			ui.layout_set_row()!!;
-			ui.layout_next_row()!!;
-			static float rf, gf, bf, af;
-			ui.slider_ver({0,0,30,100}, &rf)!!;
-			ui.slider_ver({0,0,30,100}, &gf)!!;
-			ui.slider_ver({0,0,30,100}, &bf)!!;
-			ui.slider_ver({0,0,30,100}, &af)!!;
-
-			ui.layout_next_column()!!;
-			ui.text_unbounded("Ciao Mamma\nAbilità ⚡\n'\udb80\udd2c'")!!;
-
-			ui.layout_next_column()!!;
-			ui.button_label("Continua!")!!;
-
-			ui.layout_next_row()!!;
-			static bool check;
-			ui.checkbox("", {}, &check, "tick")!!;
-			ui.checkbox("", {}, &check)!!;
-			ui.toggle("", {}, &toggle)!!;
-		};
-		ui.sprite("tux")!!;
-		
-		static char[128] text_box = "ciao mamma";
-		static usz text_len = "ciao mamma".len;
-		ui.text_box({0,0,200,200}, text_box[..], &text_len)!!;
-
-		ui.div_end()!!;
-
-		ui.div_begin(ugui::DIV_FILL, scroll_x: true, scroll_y: true)!!;
-		{
-			ui.layout_set_column()!!;
-			static float slider2 = 0.5;
-			if (ui.slider_ver({0,0,30,100}, &slider2)!!.update) {
-				io::printfn("other slider: %f", slider2);
-			}
-			ui.button({0,0,50,50})!!;
-			ui.button({0,0,50,50})!!;
-			ui.button({0,0,50,50})!!;
-			ui.button({0,0,50,50})!!;
-			if (toggle) {
-				ui.button({0,0,50,50})!!;
-				ui.button({0,0,50,50})!!;
-				ui.button({0,0,50,50})!!;
-				ui.button({0,0,50,50})!!;
-			}
-			ui.layout_next_column()!!;
-			ui.layout_set_row()!!;
-			static float f1, f2;
-			ui.slider_hor({0,0,100,30}, &f1)!!;
-			ui.slider_hor({0,0,100,30}, &f2)!!;
-		};
-		ui.div_end()!!;
 
 		// Timings counter
 		TimeStats dts = draw_times.get_stats();
@@ -279,7 +217,7 @@ fn int main(String[] args)
 			ui.layout_set_column()!!;
 			ui.text_unbounded(string::tformat("frame %d, fps = %.2f", frame, fps))!!;
 			ui.text_unbounded(string::tformat("ui avg: %s\ndraw avg: %s\nTOT: %s", uts.avg, dts.avg, uts.avg+dts.avg))!!;
-			ui.text_unbounded(string::tformat("%s %s", mod.lctrl, (String)ui.input.keyboard.text[..]))!!;
+			ui.text_unbounded(string::tformat("%s %s", mod.lctrl, (String)ui.input.keyboard.text[:ui.input.keyboard.text_len]))!!;
 		};
 		ui.div_end()!!;
 
@@ -310,3 +248,112 @@ fn int main(String[] args)
 
 	return 0;
 }
+
+fn void debug_app(ugui::Ctx* ui)
+{
+	static bool toggle;
+	ui.div_begin({.w=-100})!!;
+	{
+		ui.layout_set_column()!!;
+		if (ui.button(icon:"tux")!!.mouse_press) {
+			io::printn("press button0");
+			toggle = !toggle;
+		}
+		//ui.layout_next_column()!!;
+		if (ui.button(label: "ciao", icon: "tick")!!.mouse_press) {
+			io::printn("press button1");
+		}
+		//ui.layout_next_column()!!;
+		if (ui.button()!!.mouse_release) {
+			io::printn("release button2");
+		}
+
+		ui.layout_set_row()!!;
+		ui.layout_next_row()!!;
+		static float rf, gf, bf, af;
+		ui.slider_ver({0,0,30,100}, &rf)!!;
+		ui.slider_ver({0,0,30,100}, &gf)!!;
+		ui.slider_ver({0,0,30,100}, &bf)!!;
+		ui.slider_ver({0,0,30,100}, &af)!!;
+
+		ui.layout_next_column()!!;
+		ui.text_unbounded("Ciao Mamma\nAbilità ⚡\n'\udb80\udd2c'")!!;
+
+		ui.layout_next_column()!!;
+		ui.button("Continua!")!!;
+
+		ui.layout_next_row()!!;
+		static bool check;
+		ui.checkbox("", {}, &check, "tick")!!;
+		ui.checkbox("", {}, &check)!!;
+		ui.toggle("", {}, &toggle)!!;
+	};
+	ui.sprite("tux")!!;
+	
+	static char[128] text_box = "ciao mamma";
+	static usz text_len = "ciao mamma".len;
+	ui.text_box({0,0,200,200}, text_box[..], &text_len)!!;
+
+	ui.div_end()!!;
+
+	ui.div_begin(ugui::DIV_FILL, scroll_x: true, scroll_y: true)!!;
+	{
+		ui.layout_set_column()!!;
+		static float slider2 = 0.5;
+		if (ui.slider_ver({0,0,30,100}, &slider2)!!.update) {
+			io::printfn("other slider: %f", slider2);
+		}
+		ui.button()!!;
+		ui.button()!!;
+		ui.button()!!;
+		ui.button()!!;
+		if (toggle) {
+			ui.button()!!;
+			ui.button()!!;
+			ui.button()!!;
+			ui.button()!!;
+		}
+		ui.layout_next_column()!!;
+		ui.layout_set_row()!!;
+		static float f1, f2;
+		ui.slider_hor({0,0,100,30}, &f1)!!;
+		ui.slider_hor({0,0,100,30}, &f2)!!;
+	};
+	ui.div_end()!!;
+}
+
+fn void calculator(ugui::Ctx* ui)
+{
+	ui.div_begin(ugui::DIV_FILL)!!;
+
+	ui.layout_set_row()!!;
+	ui.div_begin({0,0,-300,50})!!;
+	ui.text_unbounded("80085")!!;
+	ui.div_end()!!;
+	ui.layout_next_row()!!;
+	
+	ui.button("7")!!;
+	ui.button("8")!!;
+	ui.button("9")!!;
+	ui.layout_next_row()!!;
+	ui.button("4")!!;
+	ui.button("5")!!;
+	ui.button("6")!!;
+	ui.layout_next_row()!!;
+	ui.button("3")!!;
+	ui.button("2")!!;
+	ui.button("1")!!;
+	ui.layout_next_row()!!;
+	ui.button(".")!!;
+	ui.button("0")!!;
+	ui.button("")!!;
+	
+	ui.layout_next_column()!!;
+	ui.layout_set_column()!!;
+	ui.button("+")!!;
+	ui.button("-")!!;
+	ui.button("*")!!;
+	ui.button("/")!!;
+	
+	ui.div_end()!!;
+}