new framework

lib/bbs/dialogs.rb

@@ -0,0 +1,114 @@
+# frozen_string_literal: true
+
+require_relative 'window'
+require_relative 'widgets'
+
+module BBS
+  module Dialogs
+    # Build a centred Window with the given inner size.
+    def self.centred_window(app, width:, height:, title: nil)
+      cols  = app.cols
+      rows  = app.rows
+      w     = [width, cols - 4].min
+      h     = [height, rows - 4].min
+      x     = (cols - w) / 2 + 1
+      y     = (rows - h) / 2 + 1
+      win   = Window.new(title: title, modal: true)
+      win.layout(x, y, w, h)
+      win
+    end
+
+    # Show a one-line message with an OK button.
+    def self.message(app, text, title: ' Message ', width: nil)
+      lines  = wrap(text, 50)
+      w      = (width || ([lines.map(&:length).max + 6, 30].max))
+      h      = lines.size + 5
+      window = centred_window(app, width: w, height: h, title: title)
+
+      lines.each_with_index do |line, i|
+        label = Widgets::Label.new(text: line, style_key: :window_text)
+        label.layout(window.bounds.x + 2, window.bounds.y + 1 + i, w - 4, 1)
+        window.add(label)
+      end
+
+      btn = Widgets::Button.new(label: '&OK', on_click: ->(_) { app.close_window(window) })
+      btn.layout(window.bounds.x + (w - 8) / 2, window.bounds.y + h - 2, 8, 1)
+      window.add(btn)
+      window.reset_focus
+      app.open_window(window)
+      window
+    end
+
+    # Yes/No confirmation. Calls on_yes / on_no.
+    def self.confirm(app, text, title: ' Confirm ', on_yes: nil, on_no: nil)
+      lines = wrap(text, 50)
+      w     = [lines.map(&:length).max + 6, 36].max
+      h     = lines.size + 5
+      window = centred_window(app, width: w, height: h, title: title)
+
+      lines.each_with_index do |line, i|
+        label = Widgets::Label.new(text: line, style_key: :window_text)
+        label.layout(window.bounds.x + 2, window.bounds.y + 1 + i, w - 4, 1)
+        window.add(label)
+      end
+
+      yes = Widgets::Button.new(label: '&Yes',
+                                on_click: ->(_) { app.close_window(window); on_yes&.call })
+      no  = Widgets::Button.new(label: '&No',
+                                on_click: ->(_) { app.close_window(window); on_no&.call })
+      yes.layout(window.bounds.x + w / 2 - 9, window.bounds.y + h - 2, 8, 1)
+      no.layout(window.bounds.x + w / 2 + 1,  window.bounds.y + h - 2, 8, 1)
+      window.add(yes)
+      window.add(no)
+      window.reset_focus
+      app.open_window(window)
+      window
+    end
+
+    # Single-line text input dialog. Calls on_submit with the entered value.
+    def self.input(app, prompt:, title: ' Input ', value: '', width: 50, on_submit: nil)
+      w      = width
+      h      = 7
+      window = centred_window(app, width: w, height: h, title: title)
+
+      label = Widgets::Label.new(text: prompt, style_key: :window_text)
+      label.layout(window.bounds.x + 2, window.bounds.y + 1, w - 4, 1)
+      window.add(label)
+
+      input = Widgets::TextInput.new(value: value)
+      input.layout(window.bounds.x + 2, window.bounds.y + 3, w - 4, 1)
+      window.add(input)
+
+      ok = Widgets::Button.new(label: '&OK',
+                               on_click: ->(_) { app.close_window(window); on_submit&.call(input.value) })
+      cancel = Widgets::Button.new(label: '&Cancel',
+                                   on_click: ->(_) { app.close_window(window) })
+      ok.layout(window.bounds.x + w / 2 - 9,     window.bounds.y + h - 2, 8, 1)
+      cancel.layout(window.bounds.x + w / 2 + 1, window.bounds.y + h - 2, 10, 1)
+      window.add(ok)
+      window.add(cancel)
+      window.reset_focus
+      window.focus_manager.focus(input)
+      app.open_window(window)
+      window
+    end
+
+    def self.wrap(text, width)
+      words = text.to_s.split
+      lines = []
+      cur   = +''
+      words.each do |w|
+        if cur.empty?
+          cur << w
+        elsif cur.length + 1 + w.length <= width
+          cur << ' ' << w
+        else
+          lines << cur.dup
+          cur = +w
+        end
+      end
+      lines << cur unless cur.empty?
+      lines
+    end
+  end
+end