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https://github.com/sourcegit-scm/sourcegit
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Auto scroll when text changed or selection changed in a TextBox
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leo
parent
4cb2568385
commit
bd96a9709f
5 changed files with 360 additions and 279 deletions
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@ -1,143 +1,225 @@
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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namespace SourceGit.Helpers {
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/// <summary>
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/// Attached properties to TextBox.
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/// </summary>
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public static class TextBoxHelper {
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/// <summary>
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/// Placeholder property
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/// </summary>
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public static readonly DependencyProperty PlaceholderProperty = DependencyProperty.RegisterAttached(
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"Placeholder",
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typeof(string),
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typeof(TextBoxHelper),
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new PropertyMetadata(string.Empty, OnPlaceholderChanged));
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/// <summary>
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/// Vertical alignment for placeholder.
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/// </summary>
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public static readonly DependencyProperty PlaceholderBaselineProperty = DependencyProperty.RegisterAttached(
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"PlaceholderBaseline",
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typeof(AlignmentY),
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typeof(TextBoxHelper),
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new PropertyMetadata(AlignmentY.Center));
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/// <summary>
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/// Property to store generated placeholder brush.
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/// </summary>
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public static readonly DependencyProperty PlaceholderBrushProperty = DependencyProperty.RegisterAttached(
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"PlaceholderBrush",
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typeof(Brush),
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typeof(TextBoxHelper),
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new PropertyMetadata(Brushes.Transparent));
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/// <summary>
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/// Triggered when placeholder 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 OnPlaceholderChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
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var textBox = d as TextBox;
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if (textBox != null) textBox.Loaded += OnTextLoaded;
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}
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/// <summary>
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/// Setter for Placeholder property
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/// </summary>
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/// <param name="element"></param>
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/// <param name="value"></param>
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public static void SetPlaceholder(UIElement element, string value) {
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element.SetValue(PlaceholderProperty, value);
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}
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/// <summary>
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/// Getter for Placeholder property
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static string GetPlaceholder(UIElement element) {
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return (string)element.GetValue(PlaceholderProperty);
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}
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/// <summary>
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/// Setter for PlaceholderBaseline property
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/// </summary>
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/// <param name="element"></param>
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/// <param name="align"></param>
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public static void SetPlaceholderBaseline(UIElement element, AlignmentY align) {
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element.SetValue(PlaceholderBaselineProperty, align);
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}
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/// <summary>
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/// Setter for PlaceholderBaseline property.
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static AlignmentY GetPlaceholderBaseline(UIElement element) {
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return (AlignmentY)element.GetValue(PlaceholderBaselineProperty);
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}
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/// <summary>
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/// Setter for PlaceholderBrush property.
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/// </summary>
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/// <param name="element"></param>
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/// <param name="value"></param>
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public static void SetPlaceholderBrush(UIElement element, Brush value) {
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element.SetValue(PlaceholderBrushProperty, value);
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}
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/// <summary>
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/// Getter for PlaceholderBrush property.
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static Brush GetPlaceholderBrush(UIElement element) {
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return (Brush)element.GetValue(PlaceholderBrushProperty);
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}
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/// <summary>
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/// Set placeholder as background when TextBox was loaded.
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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 OnTextLoaded(object sender, RoutedEventArgs e) {
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var textBox = sender as TextBox;
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if (textBox == null) return;
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Label placeholder = new Label();
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placeholder.Content = textBox.GetValue(PlaceholderProperty);
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VisualBrush brush = new VisualBrush();
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brush.AlignmentX = AlignmentX.Left;
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brush.AlignmentY = GetPlaceholderBaseline(textBox);
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brush.TileMode = TileMode.None;
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brush.Stretch = Stretch.None;
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brush.Opacity = 0.3;
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brush.Visual = placeholder;
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textBox.SetValue(PlaceholderBrushProperty, brush);
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textBox.Background = brush;
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textBox.TextChanged += OnTextChanged;
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OnTextChanged(textBox, null);
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}
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/// <summary>
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/// Dynamically hide/show placeholder.
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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 OnTextChanged(object sender, RoutedEventArgs e) {
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var textBox = sender as TextBox;
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if (string.IsNullOrEmpty(textBox.Text)) {
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textBox.Background = textBox.GetValue(PlaceholderBrushProperty) as Brush;
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} else {
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textBox.Background = Brushes.Transparent;
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}
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}
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}
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}
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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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/// Attached properties to TextBox.
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/// </summary>
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public static class TextBoxHelper {
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/// <summary>
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/// Auto scroll on text changed.
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/// </summary>
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public static readonly DependencyProperty AutoScrollProperty = DependencyProperty.RegisterAttached(
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"AutoScroll",
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typeof(bool),
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typeof(TextBoxHelper),
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new PropertyMetadata(false, OnAutoScrollChanged));
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/// <summary>
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/// Placeholder property
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/// </summary>
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public static readonly DependencyProperty PlaceholderProperty = DependencyProperty.RegisterAttached(
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"Placeholder",
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typeof(string),
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typeof(TextBoxHelper),
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new PropertyMetadata(string.Empty, OnPlaceholderChanged));
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/// <summary>
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/// Vertical alignment for placeholder.
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/// </summary>
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public static readonly DependencyProperty PlaceholderBaselineProperty = DependencyProperty.RegisterAttached(
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"PlaceholderBaseline",
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typeof(AlignmentY),
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typeof(TextBoxHelper),
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new PropertyMetadata(AlignmentY.Center));
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/// <summary>
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/// Property to store generated placeholder brush.
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/// </summary>
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public static readonly DependencyProperty PlaceholderBrushProperty = DependencyProperty.RegisterAttached(
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"PlaceholderBrush",
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typeof(Brush),
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typeof(TextBoxHelper),
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new PropertyMetadata(Brushes.Transparent));
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/// <summary>
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/// Setter for AutoScrollProperty
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/// </summary>
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/// <param name="element"></param>
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/// <param name="enabled"></param>
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public static void SetAutoScroll(UIElement element, bool enabled) {
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element.SetValue(AutoScrollProperty, enabled);
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}
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/// <summary>
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/// Getter for AutoScrollProperty
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static bool GetAutoScroll(UIElement element) {
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return (bool)element.GetValue(AutoScrollProperty);
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}
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/// <summary>
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/// Triggered when AutoScroll property 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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public static void OnAutoScrollChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
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var textBox = d as TextBox;
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if (textBox == null) return;
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textBox.SelectionChanged -= UpdateScrollOnSelectionChanged;
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if ((bool)e.NewValue == true) {
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textBox.SelectionChanged += UpdateScrollOnSelectionChanged;
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}
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}
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/// <summary>
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/// Triggered when placeholder 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 OnPlaceholderChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
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var textBox = d as TextBox;
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if (textBox != null) textBox.Loaded += OnTextLoaded;
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}
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/// <summary>
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/// Setter for Placeholder property
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/// </summary>
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/// <param name="element"></param>
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/// <param name="value"></param>
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public static void SetPlaceholder(UIElement element, string value) {
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element.SetValue(PlaceholderProperty, value);
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}
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/// <summary>
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/// Getter for Placeholder property
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static string GetPlaceholder(UIElement element) {
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return (string)element.GetValue(PlaceholderProperty);
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}
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/// <summary>
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/// Setter for PlaceholderBaseline property
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/// </summary>
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/// <param name="element"></param>
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/// <param name="align"></param>
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public static void SetPlaceholderBaseline(UIElement element, AlignmentY align) {
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element.SetValue(PlaceholderBaselineProperty, align);
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}
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/// <summary>
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/// Setter for PlaceholderBaseline property.
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static AlignmentY GetPlaceholderBaseline(UIElement element) {
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return (AlignmentY)element.GetValue(PlaceholderBaselineProperty);
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}
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/// <summary>
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/// Setter for PlaceholderBrush property.
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/// </summary>
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/// <param name="element"></param>
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/// <param name="value"></param>
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public static void SetPlaceholderBrush(UIElement element, Brush value) {
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element.SetValue(PlaceholderBrushProperty, value);
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}
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/// <summary>
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/// Getter for PlaceholderBrush property.
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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public static Brush GetPlaceholderBrush(UIElement element) {
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return (Brush)element.GetValue(PlaceholderBrushProperty);
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}
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/// <summary>
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/// Set placeholder as background when TextBox was loaded.
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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 OnTextLoaded(object sender, RoutedEventArgs e) {
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var textBox = sender as TextBox;
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if (textBox == null) return;
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Label placeholder = new Label();
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placeholder.Content = textBox.GetValue(PlaceholderProperty);
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VisualBrush brush = new VisualBrush();
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brush.AlignmentX = AlignmentX.Left;
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brush.AlignmentY = GetPlaceholderBaseline(textBox);
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brush.TileMode = TileMode.None;
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brush.Stretch = Stretch.None;
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brush.Opacity = 0.3;
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brush.Visual = placeholder;
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textBox.SetValue(PlaceholderBrushProperty, brush);
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textBox.Background = brush;
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textBox.TextChanged += UpdatePlaceholder;
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UpdatePlaceholder(textBox, null);
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}
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/// <summary>
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/// Dynamically hide/show placeholder.
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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 UpdatePlaceholder(object sender, RoutedEventArgs e) {
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var textBox = sender as TextBox;
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if (string.IsNullOrEmpty(textBox.Text)) {
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textBox.Background = textBox.GetValue(PlaceholderBrushProperty) as Brush;
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} else {
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textBox.Background = Brushes.Transparent;
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}
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}
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/// <summary>
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///
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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 UpdateScrollOnSelectionChanged(object sender, RoutedEventArgs e) {
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var textBox = sender as TextBox;
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if (textBox != null && textBox.IsFocused) {
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if (Mouse.LeftButton == MouseButtonState.Pressed && textBox.SelectionLength > 0) {
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var p = Mouse.GetPosition(textBox);
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if (p.X <= 8) {
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textBox.LineLeft();
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} else if (p.X >= textBox.ActualWidth - 8) {
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textBox.LineRight();
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}
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if (p.Y <= 8) {
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textBox.LineUp();
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} else if (p.Y >= textBox.ActualHeight - 8) {
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textBox.LineDown();
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}
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} else {
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var rect = textBox.GetRectFromCharacterIndex(textBox.CaretIndex);
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if (rect.Left <= 0) {
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textBox.ScrollToHorizontalOffset(textBox.HorizontalOffset + rect.Left);
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} else if (rect.Right >= textBox.ActualWidth) {
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textBox.ScrollToHorizontalOffset(textBox.HorizontalOffset + rect.Right);
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}
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if (rect.Top <= 0) {
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textBox.ScrollToVerticalOffset(textBox.VerticalOffset + rect.Top);
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} else if (rect.Bottom >= textBox.ActualHeight) {
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textBox.ScrollToVerticalOffset(textBox.VerticalOffset + rect.Bottom);
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}
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}
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}
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}
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}
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}
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