C# ComboBox.AddHandler方法代码示例

            public ComboBoxHintProxy(ComboBox comboBox)
            {
                if (comboBox == null) throw new ArgumentNullException(nameof(comboBox));

                _comboBox = comboBox;
                _comboBoxTextChangedEventHandler = new TextChangedEventHandler(ComboBoxTextChanged);
                _comboBox.AddHandler(TextBoxBase.TextChangedEvent, _comboBoxTextChangedEventHandler);
                _comboBox.SelectionChanged += ComboBoxSelectionChanged;
                _comboBox.Loaded += ComboBoxLoaded;
                _comboBox.IsVisibleChanged += ComboBoxIsVisibleChanged;
            }

 public override FrameworkElement GetProperyField()
 {
     DockPanel sp = new DockPanel();
     ComboBox cb = new ComboBox();
     cb.IsTextSearchEnabled = true;
     cb.IsEditable = true;
     comb = cb;
     UpdateCombo();
     comb.AddHandler(TextBox.TextChangedEvent, new TextChangedEventHandler(delegate { try { Property.SetValue(Object, new BrushConverter().ConvertFrom(null, CultureInfo.CurrentCulture, cb.Text), null); } catch { } }));
     Button btn = new Button();
     DockPanel.SetDock(btn, Dock.Right);
     btn.Content = "...";
     btn.Click += new RoutedEventHandler(OpenBrushDialog);
     sp.Children.Add(btn);
     sp.Children.Add(cb);
     return sp;
 }

        public RowEntity(int row, Grid grid, Question question, bool textBox = false)
        {
            Rank = row;
            QuestionObject = question;
            QuestionLabel = new TextBlock();
            QuestionLabel.Text = question.Title;
            QuestionLabel.FontSize = 12;
            QuestionLabel.Height = 30;
            QuestionLabel.FontWeight = FontWeights.Bold;
            Grid.SetRow(QuestionLabel, row);
            Grid.SetColumn(QuestionLabel, 0);
            grid.Children.Add(QuestionLabel);

            if (!textBox)
            {

                AnswerComboBox = new ComboBox();
                AnswerComboBox.Height = 25;
                AnswerComboBox.Margin = new Thickness(0, 0, 20, 0);
                AnswerComboBox.Uid = question.Rank.ToString();


                AnswerComboBox.ItemsSource = question.Answers;
                int x = 0;
                if (question.Default != null)
                {
                    foreach (Answer a in question.Answers)
                    {
                        if (question.Default.Title == a.Title)
                        {
                            question.Value = a;
                            AnswerComboBox.SelectedIndex = x;
                            break;
                        }
                        x++;
                    }
                }
                else if (question.Answers.Count == 1)
                {
                    AnswerComboBox.SelectedIndex = 0;
                    question.Value = question.Answers.First();
                }

                Grid.SetRow(AnswerComboBox, row);
                Grid.SetColumn(AnswerComboBox, 1);
                grid.Children.Add(AnswerComboBox);
                AnswerComboBox.AddHandler(ComboBox.SelectionChangedEvent, new SelectionChangedEventHandler(selectionChange));
            }
            else
            {
                TextBox tb = new TextBox();
                tb.Height = 25;
                tb.Margin = new Thickness(0, 0, 20, 0);
                Grid.SetRow(tb, row);
                Grid.SetColumn(tb, 1);
                grid.Children.Add(tb);
                AnswerTextBox = tb;
            }

            

        }

//.........这里部分代码省略.........
                            // Click all the buttons in the group.
                            foreach (Circuit.IButtonControl j in components.OfType<Circuit.IButtonControl>().Where(x => x.Group == b.Group))
                                j.Click();
                            UpdateSimulation(true);
                        };

                        button.MouseEnter += (o, e) => button.Opacity = 0.95;
                        button.MouseLeave += (o, e) => button.Opacity = 0.5;
                    }

                    Circuit.Speaker output = i as Circuit.Speaker;
                    if (output != null)
                        speakers += output.V;

                    // Create input controls.
                    Circuit.Input input = i as Circuit.Input;
                    if (input != null)
                    {
                        tag.ShowText = false;

                        ComboBox combo = new ComboBox()
                        {
                            Width = 80,
                            Height = 24,
                            Opacity = 0.5,
                            IsEditable = true,
                            SelectedValuePath = "Tag",
                        };

                        foreach (InputChannel j in InputChannels)
                        {
                            combo.Items.Add(new ComboBoxItem()
                            {
                                Tag = j,
                                Content = j.Name
                            });
                        }

                        Schematic.overlays.Children.Add(combo);
                        Canvas.SetLeft(combo, Canvas.GetLeft(tag) - combo.Width / 2 + tag.Width / 2);
                        Canvas.SetTop(combo, Canvas.GetTop(tag) - combo.Height / 2 + tag.Height / 2);

                        ComputerAlgebra.Expression V = Circuit.Component.DependentVariable(input.Name, Circuit.Component.t);
                        inputs[V] = new SignalChannel(0);

                        combo.SelectionChanged += (o, e) =>
                        {
                            if (combo.SelectedItem != null)
                            {
                                ComboBoxItem it = (ComboBoxItem)combo.SelectedItem;
                                inputs[V] = new InputChannel(((InputChannel)it.Tag).Index);
                            }
                        };

                        combo.AddHandler(TextBox.KeyDownEvent, new KeyEventHandler((o, e) =>
                        {
                            try
                            {
                                inputs[V] = new SignalChannel(Circuit.Quantity.Parse(combo.Text, Circuit.Units.V));
                            }
                            catch (Exception)
                            {
                                // If there is an error in the expression, zero out the signal.
                                inputs[V] = new SignalChannel(0);
                            }
                        }));

                        if (combo.Items.Count > 0)
                            combo.SelectedItem = combo.Items[0];
                        else
                            combo.Text = "0 V";

                        combo.MouseEnter += (o, e) => combo.Opacity = 0.95;
                        combo.MouseLeave += (o, e) => combo.Opacity = 0.5;
                    }
                }

                // Create audio output channels.
                for (int i = 0; i < Outputs.Length; ++i)
                {
                    OutputChannel c = new OutputChannel(i) { Name = Outputs[i].Name, Signal = speakers };
                    c.PropertyChanged += (o, e) => { if (e.PropertyName == "Signal") RebuildSolution(); };
                    OutputChannels.Add(c);
                }

                // Begin audio processing.
                if (Inputs.Any() || Outputs.Any())
                    stream = Device.Open(ProcessSamples, Inputs, Outputs);
                else
                    stream = new NullStream(ProcessSamples);

                ContentRendered += (o, e) => RebuildSolution();

                Closed += (s, e) => stream.Stop();
            }
            catch (Exception Ex)
            {
                MessageBox.Show(Ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        /// <summary>
        /// 具体刷新Tab内容的方法
        /// </summary>
        /// <param name="tab"></param>
        private void RefreshTabContent(TabItem tab)
        {
            //logger.Debug("刷新控件ing");

            if (tab.Tag == null)
                return;

            int index = (int)tab.Tag;

            var prompts = viewModel.Prompts.Where(it => it.TabIndex == index)
                                          .ToList();

            Grid grid = new Grid();

            ScrollViewer viewer = new ScrollViewer();
            viewer.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
            viewer.Content = grid;

            tab.Content = viewer;

            grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(10) });
            grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength() });
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(20) });
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(230) });
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(220) });
            grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(250, GridUnitType.Star) });
            StackPanel leftSP = new StackPanel();
            leftSP.Margin = new Thickness(5, 0, 30, 0);
            leftSP.SetValue(Grid.RowProperty, 1);
            leftSP.SetValue(Grid.ColumnProperty, 1);
            StackPanel middleSP = new StackPanel();
            middleSP.Margin = new Thickness(30, 0, 30, 0);
            middleSP.SetValue(Grid.RowProperty, 1);
            middleSP.SetValue(Grid.ColumnProperty, 2);
            StackPanel rightSP = new StackPanel();
            rightSP.Margin = new Thickness(30, 0, 0, 0);
            rightSP.SetValue(Grid.RowProperty, 1);
            rightSP.SetValue(Grid.ColumnProperty, 3);

            grid.Children.Add(leftSP);
            grid.Children.Add(middleSP);
            grid.Children.Add(rightSP);

            for (int i = 0; i < prompts.Count(); i++)
            {
                var prompt = prompts[i];

                if (prompt.ControlType == ControlType.TextBox
                    || prompt.ControlType == ControlType.UnEditabledTextBox
                    || prompt.ControlType == ControlType.Invisabled)
                {
                    Label label = new Label();
                    label.Foreground = getBrushById(prompt.ColorIndex);
                    label.DataContext = prompt;
                    label.SetBinding(Label.ContentProperty, new Binding("Name"));
                    label.SetBinding(Label.VisibilityProperty, new Binding("Visible") { Converter = new PromptValueToVisibilityConverter() });
                    label.SetBinding(Label.ToolTipProperty, new Binding("HelpMessage"));
                    leftSP.Children.Add(label);

                    TextBox tb = new TextBox();
                    //tb.MouseDoubleClick += tb_MouseDoubleClick;
                    tb.AddHandler(UIElement.MouseEnterEvent, new RoutedEventHandler(tb_MouseLeftButtonDown), true);
                    tb.DataContext = prompt;
                    tb.SetBinding(TextBox.TextProperty, new Binding("PromptValue") { ValidatesOnExceptions = true, ValidatesOnDataErrors = true, NotifyOnValidationError = true });
                    tb.SetBinding(TextBox.VisibilityProperty, new Binding("Visible") { Converter = new PromptValueToVisibilityConverter() });
                    tb.SetBinding(TextBox.IsEnabledProperty, new Binding("IsEnabled"));
                    tb.SetBinding(TextBox.ToolTipProperty, new Binding("HelpMessage"));
                    leftSP.Children.Add(tb);

                    TextBlock error = new TextBlock();
                    error.Foreground = Brushes.Red;
                    error.DataContext = prompt;
                    error.SetBinding(TextBlock.TextProperty, new Binding("ErrorMessage"));
                    error.SetBinding(Label.VisibilityProperty, new Binding("ErrorMessage") { Converter = new PromptValueToVisibilityConverter() });
                    leftSP.Children.Add(error);
                }
                else if (prompt.ControlType == ControlType.CheckBox)
                {
                    CheckBox cb = new CheckBox();
                    cb.Foreground = getBrushById(prompt.ColorIndex);
                    cb.Margin = new Thickness(0, 3, 0, 3);
                    cb.DataContext = prompt;
                    cb.AddHandler(UIElement.MouseEnterEvent, new RoutedEventHandler(tb_MouseLeftButtonDown), true);
                    cb.SetBinding(CheckBox.IsCheckedProperty, new Binding("PromptValue") { Converter = new PromptValueToCheckedConverter() });
                    cb.SetBinding(CheckBox.ContentProperty, new Binding("Name"));
                    cb.SetBinding(CheckBox.VisibilityProperty, new Binding("Visible") { Converter = new PromptValueToVisibilityConverter() });
                    cb.SetBinding(CheckBox.ToolTipProperty, new Binding("HelpMessage"));
                    rightSP.Children.Add(cb);
                }
                else if (prompt.ControlType == ControlType.ComboBox)
                {
                    Label label = new Label();
                    label.Foreground = getBrushById(prompt.ColorIndex);
                    label.DataContext = prompt;
                    label.SetBinding(Label.ContentProperty, new Binding("Name"));
                    label.SetBinding(Label.VisibilityProperty, new Binding("Visible") { Converter = new PromptValueToVisibilityConverter() });
//.........这里部分代码省略.........