keyboard support in raleigh, word wrap and more in entry widget

src/kernel/window.c

@@ -272,6 +272,17 @@ static void paint_all() {
   paint_and_above(bottom_window);
 }
 
+static void send_action(struct window *w, struct window_action packet) {
+  struct window_action *next_next = w->next_action_write + 1;
+  if (next_next >= AB_END(w->action_buffer))
+    next_next = w->action_buffer;
+  if (next_next != w->next_action_read) {
+    *(w->next_action_write) = packet;
+    w->next_action_write = next_next;
+    unwait(w->from_task, (struct wait){.mode = WINDOW_ACTION});
+  }
+}
+
 struct window *new_window(uint16_t width, uint16_t height, const struct pixel *pixel_buffer) {
   if (!pixel_buffer) {
     logf(LOG_WARN, "Refusing to create window with null pixel buffer for task %s.", active_task->name);
@@ -298,14 +309,18 @@ got_window:
   w->next_action_read = ab;
   w->next_action_write = ab;
 
-  if (top_window)
+  if (top_window) {
+    send_action(top_window, (struct window_action){.action_type = FOCUS_LEAVE});
     top_window->above = w;
+  }
   else
     bottom_window = w;
   w->above = 0;
   w->below = top_window;
   top_window = w;
 
+  send_action(top_window, (struct window_action){.action_type = FOCUS_ENTER});
+
   w->from_task = active_task;
 
   paint_and_above(w);
@@ -313,8 +328,10 @@ got_window:
 }
 
 static void del_no_paint(struct window *w) {
-  if (w == top_window)
+  if (w == top_window) {
     top_window = w->below;
+    send_action(top_window, (struct window_action){.action_type = FOCUS_ENTER});
+  }
   if (w == bottom_window)
     bottom_window = w->above;
   if (w->below)
@@ -384,17 +401,6 @@ struct window_action next_window_action(struct window *w) {
   return *action;
 }
 
-static void send_action(struct window *w, struct window_action packet) {
-  struct window_action *next_next = w->next_action_write + 1;
-  if (next_next >= AB_END(w->action_buffer))
-    next_next = w->action_buffer;
-  if (next_next != w->next_action_read) {
-    *(w->next_action_write) = packet;
-    w->next_action_write = next_next;
-    unwait(w->from_task, (struct wait){.mode = WINDOW_ACTION});
-  }
-}
-
 #define RUN_COMMAND_FILE "sys/winspace.rc"
 
 enum wm_action {

src/user/include/cxx/raleigh/w/button.h

@@ -11,8 +11,11 @@ namespace raleigh {
 
     void notify_window_change() override;
     void paint(_pixel_t *pixbuf, uint32_t pitch) override;
-    bool try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
+    void handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
     void notify_has_opaque_parent(widget *parent) override;
+    void handle_key(struct key_packet kp) override;
+    void on_focus() override;
+    void on_unfocus() override;
   private:
     widget &inner;
     void (*on_click)(button &);

src/user/include/cxx/raleigh/w/entry.h

@@ -12,10 +12,13 @@ namespace raleigh {
           const char *font="fixed-10", _pixel_t bg=RGB(ff, ff, ff),
           _pixel_t fg=RGB(00, 00, 00), _pixel_t border_color=RGB(00, 00, 00));
 
-    void notify_window_change();
-    void paint(_pixel_t *pixbuf, uint32_t pitch);
-    bool try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up);
-    void notify_has_opaque_parent(widget *parent);
+    void notify_window_change() override;
+    void paint(_pixel_t *pixbuf, uint32_t pitch) override;
+    void handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
+    void notify_has_opaque_parent(widget *parent) override;
+    void handle_key(struct key_packet kp) override;
+    void on_focus() override;
+    void on_unfocus() override;
   private:
     uint32_t rows;
     uint32_t cols;
@@ -40,12 +43,26 @@ namespace raleigh {
     uint32_t end_d;
 
     bool first_paint;
+    bool has_focus;
+    bool had_focus_last_paint;
     bool text_changed_since_last_paint;
     uint32_t cur_y_last_paint;
     uint32_t cur_x_last_paint;
     uint32_t cur_d_last_paint;
 
+    //uses cur_x, not cur_d; sets both
+    //will not modify cur_y
+    void ensure_cursor_in_line();
+
     void paint_text(_pixel_t *pixbuf, uint32_t pitch);
+    //sets line_indices[from_y + 1 .. end_y + 1], end_y, end_x and end_d
+    void get_indices(uint32_t from_y, uint32_t from_x, uint32_t from_d);
+
+    //these four return true on success, and do not send a paint request to the window
+    bool cursor_left();
+    bool cursor_right();
+    bool cursor_up();
+    bool cursor_down();
   };
 }
 

src/user/include/cxx/raleigh/w/label.h

@@ -13,8 +13,11 @@ namespace raleigh {
 
     void notify_window_change() override;
     void paint(_pixel_t *pixbuf, uint32_t pitch) override;
-    bool try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override __attribute__ ((const));
+    void handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
     void notify_has_opaque_parent(widget *parent) override;
+    void handle_key(struct key_packet kp) override;
+    void on_focus() override;
+    void on_unfocus() override;
   private:
     const char *const value;
     const struct font_info *const fi;

src/user/include/cxx/raleigh/w/padding.h

@@ -10,8 +10,11 @@ namespace raleigh {
 
     void notify_window_change() override;
     void paint(_pixel_t *pixbuf, uint32_t pitch) override;
-    bool try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
+    void handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
     void notify_has_opaque_parent(widget *parent) override;
+    void handle_key(struct key_packet kp) override;
+    void on_focus() override;
+    void on_unfocus() override;
   private:
     widget &inner;
     uint32_t pad_by;

src/user/include/cxx/raleigh/w/vbox.h

@@ -12,8 +12,11 @@ namespace raleigh {
 
     void notify_window_change() override;
     void paint(_pixel_t *pixbuf, uint32_t pitch) override;
-    bool try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
+    void handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) override;
     void notify_has_opaque_parent(widget *parent) override;
+    void handle_key(struct key_packet kp) override;
+    void on_focus() override;
+    void on_unfocus() override;
   private:
     dllist<widget &> widgets;
   };

src/user/include/cxx/raleigh/widget.h

@@ -28,8 +28,11 @@ namespace raleigh {
     //called by window class (or parent widget)
     virtual void notify_window_change() = 0;
     virtual void paint(_pixel_t *pixbuf, uint32_t pitch) = 0;
-    virtual bool try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) = 0;
+    virtual void handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) = 0;
     virtual void notify_has_opaque_parent(widget *parent) = 0;
+    virtual void handle_key(struct key_packet kp) = 0;
+    virtual void on_focus() = 0;
+    virtual void on_unfocus() = 0;
   };
 }
 

src/user/include/cxx/raleigh/window.h

@@ -20,11 +20,13 @@ namespace raleigh {
     enum try_actions_return_t {NONE, GOOD, DELETE};
     try_actions_return_t try_actions();
     void show();
+    void focus(widget &w);
   private:
     _window_handle_t handle;
     _pixel_t *pixbuf;
     coord size;
     widget &root;
+    widget *focussed;
     _pixel_t bg_color;
     bool needs_repaint;
     void paint_full();

src/user/include/knob/block.h

@@ -28,6 +28,9 @@ bool strequ(const char *a, const char *b) __attribute__ ((pure));
 //this replacement happens in place, with no memory allocation
 void str_trunc_fill(char *str, uint32_t len);
 
+//returns first index of any character of delims or the null terminator in str
+uint32_t str_find_any(const char *str, const char *delims) __attribute__ ((pure));
+
 #ifdef __cplusplus
 }
 #endif

src/user/include/knob/key.h

@@ -1,8 +1,16 @@
 #ifndef KNOB_KEY_H
 #define KNOB_KEY_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <keypack.h>
 
 char key_to_char(struct key_packet kp) __attribute__ ((pure));
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/user/knob/block.c

@@ -73,4 +73,14 @@ void str_trunc_fill(char *str, uint32_t len) {
       str[j] = ' ';
     str[len] = '\0';
   }
+}
+
+__attribute__ ((pure))
+uint32_t str_find_any(const char *str, const char *delims) {
+  const char *i;
+  for (i = str; *i; ++i)
+    for (const char *j = delims; *j; ++j)
+      if (*i == *j)
+        return i - str;
+  return i - str;
 }

src/user/raleigh/w/button.cpp

@@ -31,9 +31,9 @@ namespace raleigh {
     }
   }
 
-  bool button::try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
+  void button::handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
     if (click_type != mouse_packet::LEFT)
-      return false;
+      return;
     if (up) {
       is_pressed = false;
       inner.window_offset = coord(window_offset.x + 1, window_offset.y + 1);
@@ -47,8 +47,13 @@ namespace raleigh {
       inner.notify_window_change();
       w->notify_needs_paint(*this);
     }
-    return true;
   }
 
   void button::notify_has_opaque_parent(widget *parent) {}
+
+  void button::handle_key(struct key_packet kp) {}
+
+  void button::on_focus() {}
+
+  void button::on_unfocus() {}
 }

src/user/raleigh/w/entry.cpp

@@ -2,54 +2,75 @@
 #include <knob/format.h>
 #include <knob/block.h>
 #include <knob/heap.h>
+#include <knob/key.h>
 
 namespace raleigh {
   entry::entry(uint32_t rows, uint32_t cols, const char *default_text,
     const char *font, _pixel_t bg, _pixel_t fg, _pixel_t border_color)
     : rows(rows), cols(cols), bg(bg), fg(fg), border_color(border_color),
       fi(get_font(font)), data(new char[rows * cols]),
-      line_indices(new uint32_t[rows + 1]), first_paint(true) {
-    size = coord(fi->space_width * (cols - 1) + fi->char_width + 6, fi->space_height * (rows - 1) + fi->char_height + 6);
+      line_indices(new uint32_t[rows + 1]), first_paint(true),
+      has_focus(false) {
+    size = coord(fi->space_width  * (cols - 1) + fi->char_width  + 6,
+                 fi->space_height * (rows - 1) + fi->char_height + 6);
     closest_opaque = this;
 
-    end_x = 0;
-    end_y = 0;
+    const uint32_t l = strlen(default_text);
+    const uint32_t cl = l > rows * cols - 1 ? rows * cols - 1 : l;
+    blockcpy(data, default_text, cl);
+    data[cl] = '\0';
+
     line_indices[0] = 0;
-    for (end_d = 0; default_text[end_d]; ++end_d) {
-      if (end_d == rows * cols - 1)
-        break;
-      data[end_d] = default_text[end_d];
-      if ((default_text[end_d] == '\n') || (++end_x == cols)) {
-        if (end_y == rows - 1)
-          break;
-        line_indices[++end_y] = end_d + 1;
-        end_x = 0;
-      }
-    }
-    line_indices[end_y + 1] = end_d;
+    get_indices(0, 0, 0);
     cur_x = end_x;
     cur_y = end_y;
     cur_d = end_d;
-    data[end_d] = '\0';
+  }
+
+  void entry::get_indices(uint32_t from_y, uint32_t from_x, uint32_t from_d) {
+    while (1) {
+      const uint32_t ln = str_find_any(data + from_d, " \n");
+      bool quit_after = !data[from_d + ln];
+      if ((from_x + ln <= cols) || (ln >= cols)) {
+        from_x += ln;
+        from_d += ln;
+        if (data[from_d] == '\n') {
+          ++from_y;
+          from_x = 0;
+          line_indices[from_y] = from_d + 1;
+        }
+        else
+          ++from_x;
+        ++from_d;
+        if (from_x >= cols) {
+          ++from_y;
+          from_x = 0;
+          line_indices[from_y] = from_d;
+        }
+        if (quit_after)
+          break;
+      }
+      else {
+        ++from_y;
+        from_x = 0;
+        line_indices[from_y] = from_d;
+      }
+    }
+    line_indices[from_y + 1] = from_d;
+    end_y = from_y;
+    end_x = from_x;
+    end_d = from_d;
   }
 
   void entry::notify_window_change() {}
 
   void entry::paint_text(_pixel_t *pixbuf, uint32_t pitch) {
-    uint32_t y = 0;
-    uint32_t x = -1;
-    for (const char *i = data; *i; ++i) {
-      if (*i == '\n') {
-        ++y;
-        x = -1;
-      }
-      else {
-        if (++x == cols) {
-          ++y;
-          x = 0;
-        }
-        put_char_no_bg(fi, *i, pixbuf + (window_offset.y + 3 + y * fi->space_height) * pitch + (window_offset.x + 3 + x * fi->space_width), pitch, fg);
-      }
+    for (uint32_t y = 0; y <= end_y; ++y) {
+      const char *const line = data + line_indices[y];
+      const uint32_t len = line_indices[y + 1] - line_indices[y] >= cols ? cols : line_indices[y + 1] - line_indices[y];
+      for (uint32_t x = 0; x < len; ++x)
+        if ((line[x] != '\n') && line[x])
+          put_char_no_bg(fi, line[x], pixbuf + (window_offset.y + 3 + y * fi->space_height) * pitch + (window_offset.x + 3 + x * fi->space_width), pitch, fg);
     }
   }
 
@@ -83,28 +104,40 @@ namespace raleigh {
       text_changed_since_last_paint = false;
     }
 
-    else {
+    else if (had_focus_last_paint) {
       for (uint32_t y = 0; y < fi->char_height; ++y) {
         old_cur_ptr[y * pitch] = bg;
         old_cur_ptr[y * pitch + 1] = bg;
       }
-      if (data[cur_d_last_paint] && (data[cur_d_last_paint] != '\n'))
+      if (data[cur_d_last_paint] && (data[cur_d_last_paint] != '\n') && (cur_d_last_paint < line_indices[cur_y_last_paint + 1]))
         put_char_no_bg(fi, data[cur_d_last_paint], old_cur_ptr, pitch, fg);
     }
 
-    for (uint32_t y = 0; y < fi->char_height; ++y) {
-      cur_ptr[y * pitch] = fg;
-      cur_ptr[y * pitch + 1] = fg;
-    }
+    if (has_focus)
+      for (uint32_t y = 0; y < fi->char_height; ++y) {
+        cur_ptr[y * pitch] = fg;
+        cur_ptr[y * pitch + 1] = fg;
+      }
 
     cur_y_last_paint = cur_y;
     cur_x_last_paint = cur_x;
     cur_d_last_paint = cur_d;
+    had_focus_last_paint = has_focus;
   }
 
-  bool entry::try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
+  void entry::ensure_cursor_in_line() {
+    cur_d = line_indices[cur_y] + cur_x;
+    if (cur_d >= line_indices[cur_y + 1]) {
+      cur_d = line_indices[cur_y + 1] - 1;
+      if (data[cur_d] && (data[cur_d] != '\n'))
+        ++cur_d;
+      cur_x = cur_d - line_indices[cur_y];
+    }
+  }
+
+  void entry::handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
     if (up || (click_type != mouse_packet::LEFT))
-      return false;
+      return;
 
     if (window_coords.x - window_offset.x < 3)
       window_coords.x = 3 + window_offset.x;
@@ -121,18 +154,110 @@ namespace raleigh {
       cur_y = end_y;
       cur_x = end_x;
     }
-    cur_d = line_indices[cur_y] + cur_x;
+    ensure_cursor_in_line();
 
-    if (cur_d >= line_indices[cur_y + 1]) {
-      cur_d = line_indices[cur_y + 1] - 1;
-      if (data[cur_d] != '\n')
-        ++cur_d;
-      cur_x = cur_d - line_indices[cur_y];
-    }
-
-    w->notify_needs_paint(*this);
-    return true;
+    if (has_focus)
+      w->notify_needs_paint(*this);
+    else
+      w->focus(*this);
   }
 
   void entry::notify_has_opaque_parent(widget *parent) {}
+
+  bool entry::cursor_left() {
+    if (cur_x) {
+      --cur_x;
+      --cur_d;
+      return true;
+    }
+    if (!cur_y)
+      return false;
+
+    --cur_y;
+    cur_x = line_indices[cur_y + 1] - line_indices[cur_y] - 1;
+    if (cur_x == cols)
+      --cur_x;
+    cur_d = line_indices[cur_y] + cur_x;
+    return true;
+  }
+
+  bool entry::cursor_right() {
+    if (cur_d >= (end_d - 1))
+      return false;
+
+    ++cur_d;
+    ++cur_x;
+
+    if (cur_d >= line_indices[cur_y + 1]) {
+      cur_x = 0;
+      ++cur_y;
+      cur_d = line_indices[cur_y];
+    }
+
+    return true;
+  }
+
+  bool entry::cursor_up() {
+    if (!cur_y)
+      return false;
+
+    --cur_y;
+    ensure_cursor_in_line();
+    return true;
+  }
+
+  bool entry::cursor_down() {
+    if (cur_y == end_y)
+      return false;
+
+    ++cur_y;
+    ensure_cursor_in_line();
+    return true;
+  }
+
+  void entry::handle_key(struct key_packet kp) {
+    switch (kp.key_id) {
+    case kp.KEY_LEFT_ARROW:
+      if (cursor_left() && has_focus)
+        w->notify_needs_paint(*this);
+      break;
+    case kp.KEY_RIGHT_ARROW:
+      if (cursor_right() && has_focus)
+        w->notify_needs_paint(*this);
+      break;
+    case kp.KEY_DOWN_ARROW:
+      if (cursor_down() && has_focus)
+        w->notify_needs_paint(*this);
+      break;
+    case kp.KEY_UP_ARROW:
+      if (cursor_up() && has_focus)
+        w->notify_needs_paint(*this);
+      break;
+    case kp.KEY_HOME:
+      if (cur_x) {
+        cur_x = 0;
+        if (has_focus)
+          w->notify_needs_paint(*this);
+      }
+      break;
+    case kp.KEY_END:
+      cur_x = cols;
+      ensure_cursor_in_line();
+      if (has_focus)
+        w->notify_needs_paint(*this);
+      break;
+    default:
+      break;
+    }
+  }
+
+  void entry::on_focus() {
+    has_focus = true;
+    w->notify_needs_paint(*this);
+  }
+
+  void entry::on_unfocus() {
+    has_focus = false;
+    w->notify_needs_paint(*this);
+  }
 }

src/user/raleigh/w/label.cpp

@@ -23,12 +23,13 @@ namespace raleigh {
     }
   }
 
-  __attribute__ ((const))
-  bool label::try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
-    return false;
-  }
+  void label::handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) { }
 
   void label::notify_has_opaque_parent(widget *parent) {
     closest_opaque = parent;
   }
+
+  void label::handle_key(struct key_packet kp) {};
+  void label::on_focus() {};
+  void label::on_unfocus() {};
 }

src/user/raleigh/w/padding.cpp

@@ -17,16 +17,20 @@ namespace raleigh {
     inner.paint(pixbuf, pitch);
   }
 
-  bool padding::try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
-    return (window_coords.x >= inner.window_offset.x) &&
-           (window_coords.y >= inner.window_offset.y) &&
-           (window_coords.x < inner.window_offset.x + inner.size.x) &&
-           (window_coords.y < inner.window_offset.y + inner.size.y) &&
-            inner.try_handle_click(window_coords, click_type, up);
+  void padding::handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
+    if ((window_coords.x >= inner.window_offset.x) &&
+        (window_coords.y >= inner.window_offset.y) &&
+        (window_coords.x < inner.window_offset.x + inner.size.x) &&
+        (window_coords.y < inner.window_offset.y + inner.size.y))
+      inner.handle_click(window_coords, click_type, up);
   }
 
   void padding::notify_has_opaque_parent(widget *parent) {
     closest_opaque = parent;
     inner.notify_has_opaque_parent(parent);
   }
+
+  void padding::handle_key(struct key_packet kp) {};
+  void padding::on_focus() {};
+  void padding::on_unfocus() {};
 }

src/user/raleigh/w/vbox.cpp

@@ -27,16 +27,16 @@ namespace raleigh {
       n->d.paint(pixbuf, pitch);
   }
 
-  bool vbox::try_handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
+  void vbox::handle_click(coord window_coords, enum mouse_packet::mouse_button click_type, bool up) {
     uint32_t h = window_offset.y;
     dllist<widget &>::node *n = widgets.first;
     while (h + n->d.size.y <= window_coords.y) {
       h += n->d.size.y;
       n = n->next;
     }
-    return (window_coords.x >= n->d.window_offset.x) &&
-           (window_coords.x < n->d.window_offset.x + n->d.size.x) &&
-            n->d.try_handle_click(window_coords, click_type, up);
+    if ((window_coords.x >= n->d.window_offset.x) &&
+        (window_coords.x < n->d.window_offset.x + n->d.size.x))
+      n->d.handle_click(window_coords, click_type, up);
   }
 
   void vbox::notify_has_opaque_parent(widget *parent) {
@@ -44,4 +44,8 @@ namespace raleigh {
     for (dllist<widget &>::node *n = widgets.first; n; n = n->next)
       n->d.notify_has_opaque_parent(parent);
   }
+
+  void vbox::handle_key(struct key_packet kp) {};
+  void vbox::on_focus() {};
+  void vbox::on_unfocus() {};
 }

src/user/raleigh/window.cpp

@@ -7,8 +7,8 @@
 
 namespace raleigh {
   window::window(widget &root, _pixel_t bg_color, bool (*on_close)(window &))
-    : handle(0), size(root.size), root(root), bg_color(bg_color),
-      needs_repaint(false), on_close(on_close) {
+    : handle(0), size(root.size), root(root), focussed(&root),
+      bg_color(bg_color), on_close(on_close) {
     root.w = this;
     root.window_offset = coord(0, 0);
     root.notify_window_change();
@@ -18,6 +18,8 @@ namespace raleigh {
       show_error_and_quitf("Failed to create %d byte pixel buffer\nfor requested %dx%d pixel window.", size.x * size.y * sizeof(_pixel_t), size.x, size.y);
 
     paint_full();
+    root.on_focus();
+    needs_repaint = false;
   }
 
   window::try_actions_return_t window::try_actions() {
@@ -39,9 +41,15 @@ namespace raleigh {
           return DELETE;
       got = GOOD;
       if (wa.action_type == wa.MOUSE_DOWN)
-        root.try_handle_click(coord(wa.as_mouse.x, wa.as_mouse.y), wa.as_mouse.which, false);
-      if (wa.action_type == wa.MOUSE_UP)
-        root.try_handle_click(coord(wa.as_mouse.x, wa.as_mouse.y), wa.as_mouse.which, true);
+        root.handle_click(coord(wa.as_mouse.x, wa.as_mouse.y), wa.as_mouse.which, false);
+      else if (wa.action_type == wa.MOUSE_UP)
+        root.handle_click(coord(wa.as_mouse.x, wa.as_mouse.y), wa.as_mouse.which, true);
+      else if (wa.action_type == wa.KEY_DOWN)
+        focussed->handle_key(wa.as_key);
+      else if (wa.action_type == wa.FOCUS_ENTER)
+        focussed->on_focus();
+      else if (wa.action_type == wa.FOCUS_LEAVE)
+        focussed->on_unfocus();
     }
   }
 
@@ -67,4 +75,12 @@ namespace raleigh {
       show_error_and_quitf("Failed to get window handle for requested window.");
     open_windows.add_front(*this);
   }
+
+  void window::focus(widget &w) {
+    if (focussed != &w) {
+      focussed->on_unfocus();
+      focussed = &w;
+      focussed->on_focus();
+    }
+  }
 }

src/user/rhello/main.cpp

@@ -27,7 +27,7 @@ void main() {
   button b(pbl, &onclick);
   padding pb(b, 2);
 
-  entry e(6, 20, "I'm a text entry!\nEventually you will be able to edit me.");
+  entry e(8, 31, "This window is made with the Raleigh widget toolkit for Portland OS.\n\nI am a text entry widget. My cursor can be used, but editing is not yet implemented.");
   padding pe(e, 2);
 
   dllist<widget &> wl;