╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ Header.zig ───────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
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430 pub fn build(self: *View, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 431 self.clearGrid(); 432 const box = &self.scroll.child.box; 433 const back_visible = self.session.back == .available; 434 ui.widget.setBackButtonVisible(box, back_visible); 435 const tabs_child = self.tabsChild(); 436 const tabs_box = &tabs_child.widget.box; 437 438 // only the selected tab shows its border 439 const selected_tab = tabs_box.getFocus().child_id; 440 var tabs_width: usize = 0; 441 for (tabs_box.children.keys(), tabs_box.children.values()) |id, *child| { 442 const tb: ?*wgt.TextBox = switch (child.widget) { 443 .text_box => |*x| x, 444 else => null, 445 }; 446 if (tb) |t| ui.widget.markSelected(t, selected_tab == id); 447 tabs_width += if (child.min_size) |min_size| min_size.width orelse 0 else 0; 448 } 449 450 const viewport_width = constraint.max_size.width orelse constraint.min_size.width; 451 // the outer box's hidden border occupies two columns. keep the title 452 // and tabs together if they fit; otherwise tab strip on its own row. 453 const content_width = if (viewport_width) |width| width -| 2 else null; 454 const back_width: usize = if (back_visible) ui.widget.back_button_width else 0; 455 const wrap = if (content_width) |width| self.first_group_width + back_width + tabs_width > width else false; 456 box.options.direction = if (wrap) .vert else .horiz; 457 tabs_child.min_size = if (wrap) .{ .width = content_width, .height = null } else null; 458 (box.children.getPtr(self.gap_id) orelse unreachable).hidden = !wrap; 459 460 var scroll_constraint = constraint; 461 scroll_constraint.min_size.width = viewport_width; 462 try self.scroll.build(allocator, scroll_constraint, root_focus); 463 } 464 465 pub fn input(self: *View, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 466 _ = allocator; 467 const current_tab = self.currentTabIndex() orelse return; 468 if (inp.moveTab(key, current_tab, self.tab_ids.count())) |new_tab| { 469 const tab_id = self.tab_ids.keys()[new_tab]; 470 root_focus.setFocus(tab_id); 471 const tabs_child = self.tabsChild(); 472 const tabs_rect = tabs_child.rect orelse return; 473 const tab = tabs_child.widget.box.children.get(tab_id) orelse return; 474 var rect = tab.rect orelse return; 475 rect.x += tabs_rect.x; 476 rect.y += tabs_rect.y; 477 self.scroll.scrollToRect(rect); 478 } 479 } 480 481 pub fn clearGrid(self: *View) void { 482 self.scroll.clearGrid(); 483 } 484 485 pub fn getGrid(self: View) ?Grid { 486 return self.scroll.getGrid(); 487 } 488 489 pub fn getFocus(self: *View) *Focus { 490 return self.scroll.getFocus(); 491 } 492 493 pub fn getSelectedIndex(self: View) ?usize { 494 return self.currentTabIndex(); 495 } 496 497 fn currentTabIndex(self: View) ?usize { 498 if (self.scroll.child.box.focus.child_id != self.tabs_id) return null; 499 const child_id = self.tabsChild().widget.box.focus.child_id orelse return null; 500 return self.tab_ids.getIndex(child_id); 501 } 502 503 fn tabsChild(self: *const View) *wgt.Box(ui.Widget).Child { 504 return self.scroll.child.box.children.getPtr(self.tabs_id) orelse unreachable; 505 } 506 }; 507