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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Navigation;
using Microsoft.CodeAnalysis.Diagnostics.Log;
using Microsoft.VisualStudio.LanguageServices.Implementation.Utilities;
using Roslyn.Utilities;
using Microsoft.CodeAnalysis.Editor.Implementation.Preview;
using IVsUIShell = Microsoft.VisualStudio.Shell.Interop.IVsUIShell;
using OLECMDEXECOPT = Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT;
using Microsoft.VisualStudio.Text.Differencing;
namespace Microsoft.VisualStudio.LanguageServices.Implementation.PreviewPane
{
internal partial class PreviewPane : UserControl, IDisposable
{
private const double DefaultWidth = 400;
private static readonly string s_dummyThreeLineTitle = "A" + Environment.NewLine + "A" + Environment.NewLine + "A";
private static readonly Size s_infiniteSize = new(double.PositiveInfinity, double.PositiveInfinity);
private readonly string _id;
private readonly bool _logIdVerbatimInTelemetry;
private readonly IVsUIShell _uiShell;
private bool _isExpanded;
private readonly double _heightForThreeLineTitle;
private DifferenceViewerPreview _differenceViewerPreview;
public PreviewPane(
Image severityIcon,
string id,
string title,
string description,
Uri helpLink,
string helpLinkToolTipText,
IReadOnlyList<object> previewContent,
bool logIdVerbatimInTelemetry,
IVsUIShell uiShell,
Guid optionPageGuid = default)
{
InitializeComponent();
Loaded += PreviewPane_Loaded;
_id = id;
_logIdVerbatimInTelemetry = logIdVerbatimInTelemetry;
_uiShell = uiShell;
// Initialize header portion.
if ((severityIcon != null) && !string.IsNullOrWhiteSpace(id) && !string.IsNullOrWhiteSpace(title))
{
HeaderStackPanel.Visibility = Visibility.Visible;
SeverityIconBorder.Child = severityIcon;
// Set the initial title text to three lines worth so that we can measure the pixel height
// that WPF requires to render three lines of text under the current font and DPI settings.
TitleRun.Text = s_dummyThreeLineTitle;
TitleTextBlock.Measure(availableSize: s_infiniteSize);
_heightForThreeLineTitle = TitleTextBlock.DesiredSize.Height;
// Now set the actual title text.
TitleRun.Text = title;
if (helpLink != null)
{
Contract.ThrowIfNull(helpLinkToolTipText);
InitializeHyperlinks(helpLink, helpLinkToolTipText);
}
if (!string.IsNullOrWhiteSpace(description))
{
DescriptionParagraph.Inlines.Add(description);
}
}
_optionPageGuid = optionPageGuid;
if (optionPageGuid == default)
{
OptionsButton.Visibility = Visibility.Collapsed;
}
// Initialize preview (i.e. diff view) portion.
InitializePreviewElement(previewContent);
}
public FrameworkElement ParentElement
{
get { return (FrameworkElement)GetValue(ParentElementProperty); }
set { SetValue(ParentElementProperty, value); }
}
public static readonly DependencyProperty ParentElementProperty =
DependencyProperty.Register("ParentElement", typeof(FrameworkElement), typeof(PreviewPane), new PropertyMetadata(null));
private void PreviewPane_Loaded(object sender, RoutedEventArgs e)
{
Loaded -= PreviewPane_Loaded;
ParentElement = Parent as FrameworkElement;
}
public string AutomationName => ServicesVSResources.Preview_pane;
private void InitializePreviewElement(IReadOnlyList<object> previewItems)
{
var previewElement = CreatePreviewElement(previewItems);
if (previewElement != null)
{
HeaderSeparator.Visibility = Visibility.Visible;
PreviewDockPanel.Visibility = Visibility.Visible;
PreviewScrollViewer.Content = previewElement;
previewElement.VerticalAlignment = VerticalAlignment.Top;
previewElement.HorizontalAlignment = HorizontalAlignment.Left;
}
// 1. Width of the header section should not exceed the width of the preview content.
// In other words, the text we put in the header at the top of the preview pane
// should not cause the preview pane itself to grow wider than the width required to
// display the preview content at the bottom of the pane.
// 2. Adjust the height of the header section so that it displays only three lines worth
// by default.
AdjustWidthAndHeight(previewElement);
}
private FrameworkElement CreatePreviewElement(IReadOnlyList<object> previewItems)
{
if (previewItems == null || previewItems.Count == 0)
{
return null;
}
const int MaxItems = 3;
if (previewItems.Count > MaxItems)
{
previewItems = previewItems.Take(MaxItems).Concat("...").ToList();
}
var grid = new Grid();
foreach (var previewItem in previewItems)
{
var previewElement = GetPreviewElement(previewItem);
// no preview element
if (previewElement == null)
{
continue;
}
// the very first preview
if (grid.RowDefinitions.Count == 0)
{
grid.RowDefinitions.Add(new RowDefinition());
}
else
{
grid.RowDefinitions.Add(new RowDefinition() { Height = GridLength.Auto });
}
// set row position of the element
Grid.SetRow(previewElement, grid.RowDefinitions.Count - 1);
// add the element to the grid
grid.Children.Add(previewElement);
// set width of the grid same as the first element
if (grid.Children.Count == 1)
{
grid.Width = previewElement.Width;
}
}
if (grid.Children.Count == 0)
{
// no preview
return null;
}
// if there is only 1 item, just take preview element as it is without grid
if (grid.Children.Count == 1)
{
var preview = grid.Children[0];
// we need to take it out from visual tree
grid.Children.Clear();
return (FrameworkElement)preview;
}
return grid;
}
private FrameworkElement GetPreviewElement(object previewItem)
{
if (previewItem is DifferenceViewerPreview)
{
// Contract is there should be only 1 diff viewer, otherwise we leak.
Contract.ThrowIfFalse(_differenceViewerPreview == null);
// cache the diff viewer so that we can close it when panel goes away.
// this is a bit weird since we are mutating state here.
_differenceViewerPreview = (DifferenceViewerPreview)previewItem;
var viewer = (IWpfDifferenceViewer)_differenceViewerPreview.Viewer;
PreviewDockPanel.Background = viewer.InlineView.Background;
var previewElement = viewer.VisualElement;
return previewElement;
}
if (previewItem is string s)
{
return GetPreviewForString(s);
}
if (previewItem is FrameworkElement frameworkElement)
{
return frameworkElement;
}
// preview item we don't know how to show to users
return null;
}
private void InitializeHyperlinks(Uri helpLink, string helpLinkToolTipText)
{
IdHyperlink.Inlines.Add(_id);
IdHyperlink.NavigateUri = helpLink;
IdHyperlink.IsEnabled = true;
IdHyperlink.ToolTip = helpLinkToolTipText;
LearnMoreHyperlink.Inlines.Add(string.Format(ServicesVSResources.More_about_0, _id));
LearnMoreHyperlink.NavigateUri = helpLink;
LearnMoreHyperlink.ToolTip = helpLinkToolTipText;
}
private static FrameworkElement GetPreviewForString(string previewContent)
{
return new TextBlock()
{
Margin = new Thickness(5),
VerticalAlignment = VerticalAlignment.Center,
Text = previewContent,
TextWrapping = TextWrapping.Wrap,
};
}
// This method adjusts the width of the header section to match that of the preview content
// thereby ensuring that the preview pane itself is never wider than the preview content.
// This method also adjusts the height of the header section so that it displays only three lines
// worth by default.
private void AdjustWidthAndHeight(FrameworkElement previewElement)
{
double headerStackPanelWidth;
var titleTextBlockHeight = double.PositiveInfinity;
if (previewElement == null)
{
HeaderStackPanel.Measure(availableSize: s_infiniteSize);
headerStackPanelWidth = HeaderStackPanel.DesiredSize.Width;
TitleTextBlock.Measure(availableSize: s_infiniteSize);
titleTextBlockHeight = TitleTextBlock.DesiredSize.Height;
}
else
{
PreviewDockPanel.Measure(availableSize: new Size(
double.IsNaN(previewElement.Width) ? DefaultWidth : previewElement.Width,
double.PositiveInfinity));
headerStackPanelWidth = PreviewDockPanel.DesiredSize.Width;
if (IsNormal(headerStackPanelWidth))
{
TitleTextBlock.Measure(availableSize: new Size(headerStackPanelWidth, double.PositiveInfinity));
titleTextBlockHeight = TitleTextBlock.DesiredSize.Height;
}
}
if (IsNormal(headerStackPanelWidth))
{
HeaderStackPanel.Width = headerStackPanelWidth;
}
// If the pixel height required to render the complete title in the
// TextBlock is larger than that required to render three lines worth,
// then trim the contents of the TextBlock with an ellipsis at the end and
// display the expander button that will allow users to view the full text.
if (HasDescription || (IsNormal(titleTextBlockHeight) && (titleTextBlockHeight > _heightForThreeLineTitle)))
{
TitleTextBlock.MaxHeight = _heightForThreeLineTitle;
TitleTextBlock.TextTrimming = TextTrimming.CharacterEllipsis;
ExpanderToggleButton.Visibility = Visibility.Visible;
if (_isExpanded)
{
ExpanderToggleButton.IsChecked = true;
}
}
}
private static bool IsNormal(double size)
=> size > 0 && !double.IsNaN(size) && !double.IsInfinity(size);
private bool HasDescription
{
get
{
return DescriptionParagraph.Inlines.Count > 0;
}
}
private readonly Guid _optionPageGuid;
void IDisposable.Dispose()
{
// VS editor will call Dispose at which point we should Close() the embedded IWpfDifferenceViewer.
_differenceViewerPreview?.Dispose();
_differenceViewerPreview = null;
}
private void LearnMoreHyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e)
{
if (e.Uri == null)
{
return;
}
VisualStudioNavigateToLinkService.StartBrowser(e.Uri);
e.Handled = true;
if (sender is not Hyperlink hyperlink)
{
return;
}
DiagnosticLogger.LogHyperlink(hyperlink.Name ?? "Preview", _id, HasDescription, _logIdVerbatimInTelemetry, e.Uri.AbsoluteUri);
}
private void ExpanderToggleButton_CheckedChanged(object sender, RoutedEventArgs e)
{
if (ExpanderToggleButton.IsChecked ?? false)
{
TitleTextBlock.MaxHeight = double.PositiveInfinity;
TitleTextBlock.TextTrimming = TextTrimming.None;
if (HasDescription)
{
DescriptionDockPanel.Visibility = Visibility.Visible;
if (LearnMoreHyperlink.NavigateUri != null)
{
LearnMoreTextBlock.Visibility = Visibility.Visible;
LearnMoreHyperlink.IsEnabled = true;
}
}
_isExpanded = true;
}
else
{
TitleTextBlock.MaxHeight = _heightForThreeLineTitle;
TitleTextBlock.TextTrimming = TextTrimming.CharacterEllipsis;
DescriptionDockPanel.Visibility = Visibility.Collapsed;
_isExpanded = false;
}
}
private void OptionsButton_Click(object sender, RoutedEventArgs e)
{
if (_optionPageGuid != default)
{
ErrorHandler.ThrowOnFailure(_uiShell.PostExecCommand(
VSConstants.GUID_VSStandardCommandSet97,
(uint)VSConstants.VSStd97CmdID.ToolsOptions,
(uint)OLECMDEXECOPT.OLECMDEXECOPT_DODEFAULT,
_optionPageGuid.ToString()));
}
}
}
}
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