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// Licensed under the MIT License.
using System.Globalization;
using System.Management.Automation;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Input;
using Microsoft.Management.UI.Internal;
namespace Microsoft.Management.UI
{
/// <summary>
/// A window displaying help content and allowing search.
/// </summary>
public partial class HelpWindow : Window
{
/// <summary>
/// Minimum zoom in the slider.
/// </summary>
public static double MinimumZoom
{
get
{
return 20;
}
}
/// <summary>
/// Maximum zoom in the slider.
/// </summary>
public static double MaximumZoom
{
get
{
return 300;
}
}
/// <summary>
/// Zoom interval.
/// </summary>
public static double ZoomInterval
{
get
{
return 10;
}
}
/// <summary>
/// The ViewModel for the dialog.
/// </summary>
private readonly HelpViewModel viewModel;
/// <summary>
/// Initializes a new instance of the HelpWindow class.
/// </summary>
/// <param name="helpObject">The object with help information.</param>
public HelpWindow(PSObject helpObject)
{
InitializeComponent();
this.viewModel = new HelpViewModel(helpObject, this.DocumentParagraph);
CommonHelper.SetStartingPositionAndSize(
this,
HelpWindowSettings.Default.HelpWindowTop,
HelpWindowSettings.Default.HelpWindowLeft,
HelpWindowSettings.Default.HelpWindowWidth,
HelpWindowSettings.Default.HelpWindowHeight,
double.Parse((string)HelpWindowSettings.Default.Properties["HelpWindowWidth"].DefaultValue, CultureInfo.InvariantCulture.NumberFormat),
double.Parse((string)HelpWindowSettings.Default.Properties["HelpWindowHeight"].DefaultValue, CultureInfo.InvariantCulture.NumberFormat),
HelpWindowSettings.Default.HelpWindowMaximized);
this.ReadZoomUserSetting();
this.viewModel.PropertyChanged += this.ViewModel_PropertyChanged;
this.DataContext = this.viewModel;
this.Loaded += this.HelpDialog_Loaded;
this.Closed += this.HelpDialog_Closed;
}
/// <summary>
/// Handles the mouse wheel to zoom in/out.
/// </summary>
/// <param name="e">Event arguments.</param>
protected override void OnPreviewMouseWheel(MouseWheelEventArgs e)
{
if (Keyboard.Modifiers != ModifierKeys.Control)
{
return;
}
if (e.Delta > 0)
{
this.viewModel.ZoomIn();
e.Handled = true;
}
else
{
this.viewModel.ZoomOut();
e.Handled = true;
}
}
/// <summary>
/// Handles key down to fix the Page/Douwn going to end of help issue
/// And to implement some additional shortcuts like Ctrl+F and ZoomIn/ZoomOut.
/// </summary>
/// <param name="e">Event arguments.</param>
protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (Keyboard.Modifiers == ModifierKeys.None)
{
if (e.Key == Key.PageUp)
{
this.Scroll.PageUp();
e.Handled = true;
return;
}
if (e.Key == Key.PageDown)
{
this.Scroll.PageDown();
e.Handled = true;
return;
}
}
if (Keyboard.Modifiers == ModifierKeys.Control)
{
this.HandleZoomInAndZoomOut(e);
if (e.Handled)
{
return;
}
if (e.Key == Key.F)
{
this.Find.Focus();
e.Handled = true;
return;
}
}
if (Keyboard.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift))
{
this.HandleZoomInAndZoomOut(e);
}
}
/// <summary>
/// Reads the zoom part of the user settings.
/// </summary>
private void ReadZoomUserSetting()
{
if (HelpWindowSettings.Default.HelpZoom < HelpWindow.MinimumZoom || HelpWindowSettings.Default.HelpZoom > HelpWindow.MaximumZoom)
{
HelpWindowSettings.Default.HelpZoom = 100;
}
this.viewModel.Zoom = HelpWindowSettings.Default.HelpZoom;
}
/// <summary>
/// Handles Zoom in and Zoom out keys.
/// </summary>
/// <param name="e">Event arguments.</param>
private void HandleZoomInAndZoomOut(KeyEventArgs e)
{
if (e.Key == Key.OemPlus || e.Key == Key.Add)
{
this.viewModel.ZoomIn();
e.Handled = true;
}
if (e.Key == Key.OemMinus || e.Key == Key.Subtract)
{
this.viewModel.ZoomOut();
e.Handled = true;
}
}
/// <summary>
/// Listens to changes in the zoom in order to update the user settings.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "Zoom")
{
HelpWindowSettings.Default.HelpZoom = this.viewModel.Zoom;
}
}
/// <summary>
/// Saves the user settings.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void HelpDialog_Closed(object sender, System.EventArgs e)
{
HelpWindowSettings.Default.Save();
}
/// <summary>
/// Updates the user setting with window state.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void HelpDialog_StateChanged(object sender, System.EventArgs e)
{
HelpWindowSettings.Default.HelpWindowMaximized = this.WindowState == WindowState.Maximized;
}
/// <summary>
/// Sets the positions from user settings and start monitoring position changes.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void HelpDialog_Loaded(object sender, RoutedEventArgs e)
{
this.StateChanged += this.HelpDialog_StateChanged;
this.LocationChanged += this.HelpDialog_LocationChanged;
this.SizeChanged += this.HelpDialog_SizeChanged;
}
/// <summary>
/// Saves size changes in user settings.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void HelpDialog_SizeChanged(object sender, SizeChangedEventArgs e)
{
HelpWindowSettings.Default.HelpWindowWidth = this.Width;
HelpWindowSettings.Default.HelpWindowHeight = this.Height;
}
/// <summary>
/// Saves position changes in user settings.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void HelpDialog_LocationChanged(object sender, System.EventArgs e)
{
HelpWindowSettings.Default.HelpWindowTop = this.Top;
HelpWindowSettings.Default.HelpWindowLeft = this.Left;
}
/// <summary>
/// Called when the settings button is clicked.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void Settings_Click(object sender, RoutedEventArgs e)
{
SettingsDialog settings = new SettingsDialog();
settings.Owner = this;
settings.ShowDialog();
if (settings.DialogResult == true)
{
this.viewModel.HelpBuilder.AddTextToParagraphBuilder();
this.viewModel.Search();
}
}
/// <summary>
/// Called when the Previous button is clicked.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void PreviousMatch_Click(object sender, RoutedEventArgs e)
{
this.MoveToNextMatch(false);
}
/// <summary>
/// Called when the Next button is clicked.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">Event arguments.</param>
private void NextMatch_Click(object sender, RoutedEventArgs e)
{
this.MoveToNextMatch(true);
}
/// <summary>
/// Moves to the previous or next match.
/// </summary>
/// <param name="forward">True for forward false for backwards.</param>
private void MoveToNextMatch(bool forward)
{
TextPointer caretPosition = this.HelpText.CaretPosition;
Run nextRun = this.viewModel.Searcher.MoveAndHighlightNextNextMatch(forward, caretPosition);
this.MoveToRun(nextRun);
}
/// <summary>
/// Moves to the caret and brings the view to the <paramref name="run"/>.
/// </summary>
/// <param name="run">Run to move to.</param>
private void MoveToRun(Run run)
{
if (run == null)
{
return;
}
run.BringIntoView();
this.HelpText.CaretPosition = run.ElementEnd;
this.HelpText.Focus();
}
}
}
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