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+using NStack;
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+using System;
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+using System.Collections;
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+using System.Collections.Generic;
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+using System.Linq;
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+using Terminal.Gui;
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+
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+namespace UICatalog {
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+ [ScenarioMetadata (Name: "List View With Selection", Description: "ListView with colunns and selection")]
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+ [ScenarioCategory ("Controls")]
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+ class ListViewWithSelection : Scenario {
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+
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+ public CheckBox _customRenderCB;
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+ public CheckBox _allowMarkingCB;
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+ public CheckBox _allowMultipleCB;
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+ public ListView _listView;
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+
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+ public List<Type> _scenarios = Scenario.GetDerivedClasses<Scenario>().OrderBy (t => Scenario.ScenarioMetadata.GetName (t)).ToList ();
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+
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+ public override void Setup ()
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+ {
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+ _customRenderCB = new CheckBox ("Render with columns") {
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+ X = 0,
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+ Y = 0,
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+ Height = 1,
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+ };
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+ Win.Add (_customRenderCB);
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+ _customRenderCB.Toggled += _customRenderCB_Toggled; ;
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+
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+ _allowMarkingCB = new CheckBox ("Allow Marking") {
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+ X = Pos.Right (_customRenderCB) + 1,
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+ Y = 0,
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+ Height = 1,
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+ };
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+ Win.Add (_allowMarkingCB);
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+ _allowMarkingCB.Toggled += AllowMarkingCB_Toggled;
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+
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+ _allowMultipleCB = new CheckBox ("Allow Multi-Select") {
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+ X = Pos.Right (_allowMarkingCB) + 1,
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+ Y = 0,
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+ Height = 1,
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+ Visible = _allowMarkingCB.Checked
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+ };
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+ Win.Add (_allowMultipleCB);
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+ _allowMultipleCB.Toggled += AllowMultipleCB_Toggled;
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+
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+ _listView = new ListView () {
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+ X = 1,
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+ Y = 2,
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+ Height = Dim.Fill (),
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+ Width = Dim.Fill (1),
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+ //ColorScheme = Colors.TopLevel,
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+ AllowsMarking = false,
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+ AllowsMultipleSelection = false
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+ };
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+ Win.Add (_listView);
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+
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+
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+ _listView.SetSource (_scenarios);
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+
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+ }
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+
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+ private void _customRenderCB_Toggled (bool prev)
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+ {
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+ if (prev) {
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+ _listView.SetSource (_scenarios);
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+ } else {
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+ _listView.Source = new ScenarioListDataSource (_scenarios);
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+ }
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+
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+ Win.SetNeedsDisplay ();
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+ }
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+
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+ private void AllowMarkingCB_Toggled (bool prev)
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+ {
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+ _listView.AllowsMarking = !prev;
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+ _allowMultipleCB.Visible = _listView.AllowsMarking;
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+ Win.SetNeedsDisplay ();
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+ }
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+
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+ private void AllowMultipleCB_Toggled (bool prev)
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+ {
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+ _listView.AllowsMultipleSelection = !prev;
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+ Win.SetNeedsDisplay ();
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+ }
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+
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+ // This is basicaly the same implementation used by the UICatalog main window
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+ internal class ScenarioListDataSource : IListDataSource {
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+ int _nameColumnWidth = 30;
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+ private List<Type> scenarios;
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+ BitArray marks;
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+ int count;
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+
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+ public List<Type> Scenarios {
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+ get => scenarios;
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+ set {
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+ if (value != null) {
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+ count = value.Count;
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+ marks = new BitArray (count);
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+ scenarios = value;
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+ }
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+ }
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+ }
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+ public bool IsMarked (int item)
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+ {
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+ if (item >= 0 && item < count)
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+ return marks [item];
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+ return false;
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+ }
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+
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+ public int Count => Scenarios != null ? Scenarios.Count : 0;
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+
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+ public ScenarioListDataSource (List<Type> itemList) => Scenarios = itemList;
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+
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+ public void Render (ListView container, ConsoleDriver driver, bool selected, int item, int col, int line, int width)
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+ {
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+ container.Move (col, line);
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+ // Equivalent to an interpolated string like $"{Scenarios[item].Name, -widtestname}"; if such a thing were possible
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+ var s = String.Format (String.Format ("{{0,{0}}}", -_nameColumnWidth), Scenario.ScenarioMetadata.GetName (Scenarios [item]));
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+ RenderUstr (driver, $"{s} {Scenario.ScenarioMetadata.GetDescription (Scenarios [item])}", col, line, width);
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+ }
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+
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+ public void SetMark (int item, bool value)
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+ {
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+ if (item >= 0 && item < count)
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+ marks [item] = value;
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+ }
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+
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+ // A slightly adapted method from: https://github.com/migueldeicaza/gui.cs/blob/fc1faba7452ccbdf49028ac49f0c9f0f42bbae91/Terminal.Gui/Views/ListView.cs#L433-L461
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+ private void RenderUstr (ConsoleDriver driver, ustring ustr, int col, int line, int width)
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+ {
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+ int used = 0;
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+ int index = 0;
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+ while (index < ustr.Length) {
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+ (var rune, var size) = Utf8.DecodeRune (ustr, index, index - ustr.Length);
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+ var count = Rune.ColumnWidth (rune);
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+ if (used + count >= width) break;
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+ driver.AddRune (rune);
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+ used += count;
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+ index += size;
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+ }
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+
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+ while (used < width) {
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+ driver.AddRune (' ');
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+ used++;
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+ }
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+ }
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+
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+ public IList ToList ()
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+ {
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+ return Scenarios;
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+ }
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+ }
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+ }
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+}
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Charlie Kindel