╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ Header.zig ───────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
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263 // the outer box's hidden border occupies two columns. keep the title 264 // and tabs together if they fit; otherwise tab strip on its own row. 265 const viewport_width = constraint.max_size.width orelse constraint.min_size.width; 266 const content_width = if (viewport_width) |width| width -| 2 else null; 267 const back_width: usize = if (back_visible) ui.widget.back_button_width else 0; 268 const wrap = if (content_width) |width| self.first_group_width + back_width + tabs_width > width else false; 269 box.options.direction = if (wrap) .vert else .horiz; 270 tabs_child.min_size = if (wrap) .{ .width = content_width, .height = null } else null; 271 (box.children.getPtr(self.gap_id) orelse unreachable).hidden = !wrap; 272 273 var scroll_constraint = constraint; 274 scroll_constraint.min_size.width = viewport_width; 275 try self.scroll.build(allocator, scroll_constraint, root_focus); 276 } 277 278 pub fn input(self: *View, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 279 _ = allocator; 280 const current_tab = self.currentTabIndex() orelse return; 281 if (inp.moveTab(key, current_tab, self.tab_ids.count())) |new_tab| { 282 const tab_id = self.tab_ids.keys()[new_tab]; 283 root_focus.setFocus(tab_id); 284 const tabs_child = self.tabsChild(); 285 const tabs_rect = tabs_child.rect orelse return; 286 const tab = tabs_child.widget.box.children.get(tab_id) orelse return; 287 var rect = tab.rect orelse return; 288 rect.x += tabs_rect.x; 289 rect.y += tabs_rect.y; 290 self.scroll.scrollToRect(rect); 291 } 292 } 293 294 pub fn clearGrid(self: *View) void { 295 self.scroll.clearGrid(); 296 } 297 298 pub fn getGrid(self: View) ?Grid { 299 return self.scroll.getGrid(); 300 } 301 302 pub fn getFocus(self: *View) *Focus { 303 return self.scroll.getFocus(); 304 } 305 306 pub fn getSelectedIndex(self: View) ?usize { 307 return self.currentTabIndex(); 308 } 309 310 fn currentTabIndex(self: View) ?usize { 311 if (self.scroll.child.box.focus.child_id != self.tabs_id) return null; 312 const child_id = self.tabsChild().widget.box.focus.child_id orelse return null; 313 return self.tab_ids.getIndex(child_id); 314 } 315 316 fn tabsChild(self: *const View) *wgt.Box(ui.Widget).Child { 317 return self.scroll.child.box.children.getPtr(self.tabs_id) orelse unreachable; 318 } 319 }; 320