git_bsmd/ENI2/Controls/ClosableTabItem.cs

// Copyright (c) 2017 schick Informatik
// Description: Custom tab item
//

using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Threading;

namespace ENI2.Controls
{
    /// <summary>
    /// Follow steps 1a or 1b and then 2 to use this custom control in a XAML file.
    ///
    /// Step 1a) Using this custom control in a XAML file that exists in the current project.
    /// Add this XmlNamespace attribute to the root element of the markup file where it is 
    /// to be used:
    ///
    ///     xmlns:MyNamespace="clr-namespace:ENI2.Controls"
    ///
    ///
    /// Step 1b) Using this custom control in a XAML file that exists in a different project.
    /// Add this XmlNamespace attribute to the root element of the markup file where it is 
    /// to be used:
    ///
    ///     xmlns:MyNamespace="clr-namespace:ENI2.Controls;assembly=ENI2.Controls"
    ///
    /// You will also need to add a project reference from the project where the XAML file lives
    /// to this project and Rebuild to avoid compilation errors:
    ///
    ///     Right click on the target project in the Solution Explorer and
    ///     "Add Reference"->"Projects"->[Browse to and select this project]
    ///
    ///
    /// Step 2)
    /// Go ahead and use your control in the XAML file.
    ///
    ///     <MyNamespace:ClosableTabItem/>
    ///
    /// </summary>
    public class ClosableTabItem : TabItem
    {
        private Storyboard blinkTextStoryboard;

        /*
         * 
        static ClosableTabItem()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ClosableTabItem), new FrameworkPropertyMetadata(typeof(ClosableTabItem)));
        }
        */
        private TextBlock textBlock;

        public event CancelEventHandler TabClosing;

        protected Storyboard BlinkTextStoryboard
        {
            get
            {
                if(blinkTextStoryboard == null)
                {
                    this.blinkTextStoryboard = new Storyboard();                    

                    ColorAnimationUsingKeyFrames cauk = new ColorAnimationUsingKeyFrames();
                    cauk.AutoReverse = true;
                    cauk.KeyFrames.Add(new DiscreteColorKeyFrame(Colors.Black, KeyTime.FromTimeSpan(new TimeSpan(0,0,1))));
                    cauk.KeyFrames.Add(new DiscreteColorKeyFrame(Colors.Red, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 2))));
                    cauk.KeyFrames.Add(new DiscreteColorKeyFrame(Colors.White, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 3))));
                    
                    Storyboard.SetTarget(cauk, this.textBlock.Foreground);
                    Storyboard.SetTargetProperty(cauk, new PropertyPath(SolidColorBrush.ColorProperty));

                    this.blinkTextStoryboard.Children.Add(cauk);

                }
                return blinkTextStoryboard;
            }
        }


        public bool IsHighlighted
        {
            private get { return false; }
            set
            {

                if (value) this.textBlock.Foreground = Brushes.Red; //this.BlinkTextStoryboard.Begin(); // warum auch immer das nicht funktioniert
                else this.textBlock.Foreground = Brushes.Black; //this.BlinkTextStoryboard.Stop();
            }
        }

        public bool IsHighlightResponded
        {
            private get { return false; }
            set
            {
                if (value) this.textBlock.Foreground = Brushes.Green;
                else this.textBlock.Foreground = Brushes.Black;
            }
        }

        public bool IsCancelled
        {
            private get { return false; }
            set
            {
                if (value)
                {
                    this.textBlock.Foreground = Brushes.Gray;
                    this.textBlock.Background = Brushes.LightGray;
                }
            }
        }

        public void SetHeaderText(string headerText, bool lockedTab)
        {
            // Container for header controls
            DockPanel dockPanel = new DockPanel();
            dockPanel.Height = 22;            

            this.textBlock = new TextBlock { Text = headerText };
            this.textBlock.Foreground = new SolidColorBrush(Colors.Black);
            // this.textBlock.Background = lockedTab ? Brushes.LightGreen : Brushes.Orange; // sie wollen die bunten Panels doch nicht
            this.textBlock.Margin = new Thickness(1);
            this.textBlock.VerticalAlignment = VerticalAlignment.Center;

            dockPanel.Children.Add(this.textBlock);

            // Close button to remove the tab
            var closeButton = new Button();
            closeButton.Content = "X";
            closeButton.Margin = new Thickness(5, 0, 0, 0);
            closeButton.Foreground = Brushes.Red;            
            closeButton.Height = 18;
            closeButton.Width = 15;
            closeButton.Opacity = 0.2;
            closeButton.FontSize = 8;
            closeButton.FontWeight = FontWeights.Bold;
            closeButton.VerticalAlignment = VerticalAlignment.Center;

            closeButton.MouseEnter += (sender, e) => {
                DoubleAnimation animation = new DoubleAnimation(0.2, 1.0, new TimeSpan(0, 0, 0, 0, 500));
                closeButton.BeginAnimation(Button.OpacityProperty, animation);
            };
            closeButton.MouseLeave += (sender, e) => {
                DoubleAnimation animation = new DoubleAnimation(1.0, 0.2, new TimeSpan(0, 0, 0, 0, 500));
                closeButton.BeginAnimation(Button.OpacityProperty, animation);
            };

            closeButton.Click +=
                (sender, e) =>
                {
                    bool abort = false;
                    if (TabClosing != null)
                    {
                        CancelEventArgs cancelEventArgs = new CancelEventArgs();
                        this.TabClosing(this, cancelEventArgs);
                        if (cancelEventArgs.Cancel) abort = true;
                    }
                    if (!abort)
                    {
                        var tabControl = Parent as TabControl;
                        tabControl.SelectedItem = null;
                        _ = Dispatcher.BeginInvoke(new Action(() => tabControl.Items.Remove(this)), DispatcherPriority.Background);                        
                    }
                };
            dockPanel.Children.Add(closeButton);

            // Set the header
            Header = dockPanel;
        }

    }
}