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https://github.com/sourcegit-scm/sourcegit
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Upgrade project style
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136 changed files with 29 additions and 770 deletions
329
SourceGit/Helpers/TreeViewHelper.cs
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329
SourceGit/Helpers/TreeViewHelper.cs
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media;
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namespace SourceGit.Helpers {
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/// <summary>
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/// Helper class to enable multi-selection of TreeView
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/// </summary>
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public static class TreeViewHelper {
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/// <summary>
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/// Definition of EnableMultiSelection property.
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/// </summary>
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public static readonly DependencyProperty EnableMultiSelectionProperty =
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DependencyProperty.RegisterAttached(
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"EnableMultiSelection",
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typeof(bool),
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typeof(TreeViewHelper),
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new FrameworkPropertyMetadata(false, OnEnableMultiSelectionChanged));
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/// <summary>
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/// Getter of EnableMultiSelection
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/// </summary>
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/// <param name="obj"></param>
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/// <returns></returns>
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public static bool GetEnableMultiSelection(DependencyObject obj) {
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return (bool)obj.GetValue(EnableMultiSelectionProperty);
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}
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/// <summary>
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/// Setter of EnableMultiSelection
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/// </summary>
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/// <param name="obj"></param>
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/// <param name="value"></param>
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public static void SetEnableMultiSelection(DependencyObject obj, bool value) {
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obj.SetValue(EnableMultiSelectionProperty, value);
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}
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/// <summary>
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/// Definition of SelectedItems
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/// </summary>
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public static readonly DependencyProperty SelectedItemsProperty =
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DependencyProperty.RegisterAttached(
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"SelectedItems",
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typeof(ObservableCollection<TreeViewItem>),
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typeof(TreeViewHelper),
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new FrameworkPropertyMetadata(null));
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/// <summary>
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/// Getter of SelectedItems
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/// </summary>
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/// <param name="obj"></param>
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/// <returns></returns>
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public static ObservableCollection<TreeViewItem> GetSelectedItems(DependencyObject obj) {
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return (ObservableCollection<TreeViewItem>)obj.GetValue(SelectedItemsProperty);
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}
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/// <summary>
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/// Setter of SelectedItems
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/// </summary>
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/// <param name="obj"></param>
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/// <param name="value"></param>
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public static void SetSelectedItems(DependencyObject obj, ObservableCollection<TreeViewItem> value) {
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obj.SetValue(SelectedItemsProperty, value);
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}
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/// <summary>
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/// Definition of IsChecked property.
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/// </summary>
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public static readonly DependencyProperty IsCheckedProperty =
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DependencyProperty.RegisterAttached(
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"IsChecked",
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typeof(bool),
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typeof(TreeViewHelper),
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new FrameworkPropertyMetadata(false));
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/// <summary>
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/// Getter of IsChecked Property.
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/// </summary>
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/// <param name="obj"></param>
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/// <returns></returns>
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public static bool GetIsChecked(DependencyObject obj) {
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return (bool)obj.GetValue(IsCheckedProperty);
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}
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/// <summary>
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/// Setter of IsChecked property
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/// </summary>
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/// <param name="obj"></param>
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/// <param name="value"></param>
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public static void SetIsChecked(DependencyObject obj, bool value) {
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obj.SetValue(IsCheckedProperty, value);
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}
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/// <summary>
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/// Definition of MultiSelectionChangedEvent
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/// </summary>
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public static readonly RoutedEvent MultiSelectionChangedEvent =
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EventManager.RegisterRoutedEvent("MultiSelectionChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(TreeViewHelper));
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/// <summary>
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/// Add handler for MultiSelectionChanged event.
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/// </summary>
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/// <param name="d"></param>
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/// <param name="handler"></param>
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public static void AddMultiSelectionChangedHandler(DependencyObject d, RoutedEventHandler handler) {
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var tree = d as TreeView;
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if (tree != null) tree.AddHandler(MultiSelectionChangedEvent, handler);
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}
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/// <summary>
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/// Remove handler for MultiSelectionChanged event.
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/// </summary>
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/// <param name="d"></param>
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/// <param name="handler"></param>
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public static void RemoveMultiSelectionChangedHandler(DependencyObject d, RoutedEventHandler handler) {
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var tree = d as TreeView;
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if (tree != null) tree.RemoveHandler(MultiSelectionChangedEvent, handler);
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}
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/// <summary>
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/// Select all items in tree.
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/// </summary>
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/// <param name="tree"></param>
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public static void SelectWholeTree(TreeView tree) {
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var selected = GetSelectedItems(tree);
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selected.Clear();
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SelectAll(selected, tree);
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tree.RaiseEvent(new RoutedEventArgs(MultiSelectionChangedEvent));
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}
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/// <summary>
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/// Selected one item by DataContext
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/// </summary>
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/// <param name="tree"></param>
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/// <param name="obj"></param>
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public static void SelectOneByContext(TreeView tree, object obj) {
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var item = FindTreeViewItemByDataContext(tree, obj);
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if (item != null) {
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var selected = GetSelectedItems(tree);
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selected.Add(item);
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item.SetValue(IsCheckedProperty, true);
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tree.RaiseEvent(new RoutedEventArgs(MultiSelectionChangedEvent));
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}
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}
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/// <summary>
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/// Unselect the whole tree.
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/// </summary>
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/// <param name="tree"></param>
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public static void UnselectTree(TreeView tree) {
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var selected = GetSelectedItems(tree);
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if (selected.Count == 0) return;
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foreach (var old in selected) old.SetValue(IsCheckedProperty, false);
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selected.Clear();
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tree.RaiseEvent(new RoutedEventArgs(MultiSelectionChangedEvent));
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}
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/// <summary>
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/// Hooks when EnableMultiSelection changed.
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/// </summary>
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/// <param name="d"></param>
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/// <param name="e"></param>
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private static void OnEnableMultiSelectionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
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var tree = d as TreeView;
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if (tree != null && (bool)e.NewValue) {
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tree.SetValue(SelectedItemsProperty, new ObservableCollection<TreeViewItem>());
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tree.PreviewMouseDown += OnTreeMouseDown;
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}
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}
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/// <summary>
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/// Preview mouse button select.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private static void OnTreeMouseDown(object sender, MouseButtonEventArgs e) {
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var tree = sender as TreeView;
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if (tree == null) return;
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var hit = VisualTreeHelper.HitTest(tree, e.GetPosition(tree));
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if (hit == null || hit.VisualHit is null) return;
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var item = FindTreeViewItem(hit.VisualHit as UIElement);
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if (item == null) return;
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var selected = GetSelectedItems(tree);
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if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)) {
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if (GetIsChecked(item)) {
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selected.Remove(item);
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item.SetValue(IsCheckedProperty, false);
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} else {
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selected.Add(item);
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item.SetValue(IsCheckedProperty, true);
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}
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} else if ((Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift)) && selected.Count > 0) {
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var last = selected.Last();
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if (last == item) return;
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var lastPos = last.PointToScreen(new Point(0, 0));
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var curPos = item.PointToScreen(new Point(0, 0));
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if (lastPos.Y > curPos.Y) {
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SelectRange(selected, tree, item, last);
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} else {
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SelectRange(selected, tree, last, item);
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}
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selected.Add(item);
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item.SetValue(IsCheckedProperty, true);
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} else if (e.RightButton == MouseButtonState.Pressed) {
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if (GetIsChecked(item)) return;
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foreach (var old in selected) old.SetValue(IsCheckedProperty, false);
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selected.Clear();
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selected.Add(item);
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item.SetValue(IsCheckedProperty, true);
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} else {
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foreach (var old in selected) old.SetValue(IsCheckedProperty, false);
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selected.Clear();
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selected.Add(item);
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item.SetValue(IsCheckedProperty, true);
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}
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tree.RaiseEvent(new RoutedEventArgs(MultiSelectionChangedEvent));
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}
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/// <summary>
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/// Find TreeViewItem by child element.
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/// </summary>
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/// <param name="item"></param>
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/// <param name="child"></param>
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/// <returns></returns>
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private static TreeViewItem FindTreeViewItem(DependencyObject child) {
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if (child == null) return null;
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if (child is TreeViewItem) return child as TreeViewItem;
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if (child is TreeView) return null;
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return FindTreeViewItem(VisualTreeHelper.GetParent(child));
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}
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/// <summary>
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/// Find TreeViewItem by DataContext
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/// </summary>
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/// <param name="control"></param>
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/// <param name="obj"></param>
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/// <returns></returns>
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private static TreeViewItem FindTreeViewItemByDataContext(ItemsControl control, object obj) {
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if (control == null) return null;
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if (control.DataContext == obj) return control as TreeViewItem;
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for (int i = 0; i < control.Items.Count; i++) {
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var child = control.ItemContainerGenerator.ContainerFromIndex(i) as ItemsControl;
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var found = FindTreeViewItemByDataContext(child, obj);
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if (found != null) return found;
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}
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return null;
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}
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/// <summary>
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/// Select all items.
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/// </summary>
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/// <param name="selected"></param>
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/// <param name="control"></param>
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private static void SelectAll(ObservableCollection<TreeViewItem> selected, ItemsControl control) {
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for (int i = 0; i < control.Items.Count; i++) {
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var child = control.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;
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if (child == null) continue;
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selected.Add(child);
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child.SetValue(IsCheckedProperty, true);
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SelectAll(selected, child);
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}
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}
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/// <summary>
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/// Select range items between given.
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/// </summary>
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/// <param name="selected"></param>
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/// <param name="control"></param>
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/// <param name="from"></param>
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/// <param name="to"></param>
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/// <param name="started"></param>
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private static int SelectRange(ObservableCollection<TreeViewItem> selected, ItemsControl control, TreeViewItem from, TreeViewItem to, int matches = 0) {
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for (int i = 0; i < control.Items.Count; i++) {
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var child = control.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;
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if (child == null) continue;
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if (matches == 1) {
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if (child == to) return 2;
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selected.Add(child);
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child.SetValue(IsCheckedProperty, true);
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if (TryEndRangeSelection(selected, child, to)) return 2;
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} else if (child == from) {
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matches = 1;
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if (TryEndRangeSelection(selected, child, to)) return 2;
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} else {
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matches = SelectRange(selected, child, from, to, matches);
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if (matches == 2) return 2;
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}
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}
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return matches;
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}
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private static bool TryEndRangeSelection(ObservableCollection<TreeViewItem> selected, TreeViewItem control, TreeViewItem end) {
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for (int i = 0; i < control.Items.Count; i++) {
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var child = control.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;
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if (child == null) continue;
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if (child == end) {
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return true;
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} else {
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selected.Add(child);
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child.SetValue(IsCheckedProperty, true);
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var ended = TryEndRangeSelection(selected, child, end);
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if (ended) return true;
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}
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}
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return false;
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}
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}
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}
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