preparation

src/core/text.rs

@@ -5,7 +5,10 @@ use crate::prelude::*;
 pub struct Text {
     pub content: String,
     pub attrs: TextAttrs,
+    pub align: Align,
     buf: TextBuffer,
+    cursor: Cursor,
+    size: Vec2,
 }
 
 impl Text {
@@ -32,16 +35,34 @@ impl Text {
             content: content.into(),
             buf: TextBuffer::new_empty(Metrics::new(attrs.font_size, attrs.line_height)),
             attrs,
+            align: Align::Center,
+            cursor: Cursor::None,
+            size: Vec2::ZERO,
         }
     }
+    pub fn select(&mut self, pos: Vec2, size: Vec2) {
+        let pos = pos - self.region().top_left.to_size(size);
+        let Some(cursor) = self.buf.hit(pos.x, pos.y) else {
+            return;
+        };
+        self.cursor = Cursor::Select {
+            line: cursor.line,
+            idx: cursor.index,
+        };
+    }
+
+    pub fn region(&self) -> UiRegion {
+        UiRegion::from_size_align(self.size, self.align)
+    }
 }
 
 impl Widget for Text {
     fn draw(&mut self, painter: &mut Painter) {
-        let (handle, offset) = painter.render_text(&mut self.buf, &self.content, &self.attrs);
+        let (handle, offset) =
+            painter.render_text(&mut self.buf, &self.content, &self.attrs, &self.cursor);
         let dims = handle.size();
-        let size = offset.size(&handle);
-        let mut region = Align::Center.pos().expand(size);
+        self.size = offset.size(&handle);
+        let mut region = self.region();
         region.top_left.offset += offset.top_left;
         region.bot_right.offset = region.top_left.offset + dims;
         painter.draw_texture_within(&handle, region);
@@ -49,8 +70,7 @@ impl Widget for Text {
 
     fn get_size(&mut self, ctx: &mut SizeCtx) -> Vec2 {
         let (handle, offset) =
-            ctx.text
-                .draw(&mut self.buf, &self.content, &self.attrs, ctx.textures);
+            ctx.draw_text(&mut self.buf, &self.content, &self.attrs, &self.cursor);
         offset.size(&handle)
     }
 }