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namespace Microsoft.VisualStudio.Text.Operations.Implementation
{
using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.Commanding;
using Microsoft.VisualStudio.Text.Editor;
internal class ExpandContractSelectionImplementation
{
private readonly IEditorOptions editorOptions;
private readonly ITextStructureNavigatorSelectorService navigatorSelectorService;
private bool ignoreSelectionChangedEvent;
public static ExpandContractSelectionImplementation GetOrCreateExpandContractState(
ITextView textView,
IEditorOptionsFactoryService editorOptionsFactoryService,
ITextStructureNavigatorSelectorService navigator)
{
return textView.Properties.GetOrCreateSingletonProperty<ExpandContractSelectionImplementation>(
typeof(ExpandContractSelectionImplementation),
() => new ExpandContractSelectionImplementation(
navigator,
editorOptionsFactoryService.GetOptions(textView),
textView));
}
private ExpandContractSelectionImplementation(
ITextStructureNavigatorSelectorService navigatorSelectorService,
IEditorOptions editorOptions,
ITextView textView)
{
this.editorOptions = editorOptions;
this.navigatorSelectorService = navigatorSelectorService;
textView.Selection.SelectionChanged += this.OnSelectionChanged;
}
// Internal for testing.
internal readonly Stack<Tuple<VirtualSnapshotSpan, TextSelectionMode>> previousExpansionsStack
= new Stack<Tuple<VirtualSnapshotSpan, TextSelectionMode>>();
public CommandState GetExpandCommandState(ITextView textView) => CommandState.Available;
public CommandState GetContractCommandState(ITextView textView)
{
if (this.previousExpansionsStack.Count > 0)
{
return CommandState.Available;
}
return CommandState.Unavailable;
}
public bool ExpandSelection(ITextView textView)
{
try
{
this.ignoreSelectionChangedEvent = true;
var navigator = this.GetNavigator(textView);
VirtualSnapshotSpan currentSelection = textView.Selection.StreamSelectionSpan;
previousExpansionsStack.Push(Tuple.Create(currentSelection, textView.Selection.Mode));
SnapshotSpan newSelection;
// If the current language has opt-ed out, return the span of the current word instead.
if (this.editorOptions.GetOptionValue(ExpandContractSelectionOptions.ExpandContractSelectionEnabledKey))
{
// On first invocation, select the current word.
if (currentSelection.Length == 0)
{
newSelection = this.GetNavigator(textView).GetExtentOfWord(currentSelection.Start.Position).Span;
}
else
{
newSelection = this.GetNavigator(textView).GetSpanOfEnclosing(currentSelection.SnapshotSpan);
}
}
else
{
// Since the span of the current word can be left or right associative relative to the caret
// in different contexts, to avoid different selections on subsequent invocations of Expand
// Selection, always use the center point in the selection to compute the span of the current word.
var centerPoint = currentSelection.Start.Position.Add(
(currentSelection.End.Position.Position - currentSelection.Start.Position.Position) / 2);
newSelection = navigator.GetExtentOfWord(centerPoint).Span;
}
textView.Selection.Mode = TextSelectionMode.Stream;
textView.Selection.Select(newSelection, isReversed: false);
}
finally
{
this.ignoreSelectionChangedEvent = false;
}
return true; //return true if command is handled
}
public bool ContractSelection(ITextView textView)
{
try
{
this.ignoreSelectionChangedEvent = true;
if (this.previousExpansionsStack.Count > 0)
{
Tuple<VirtualSnapshotSpan, TextSelectionMode> previousExpansion = this.previousExpansionsStack.Pop();
VirtualSnapshotSpan previousExpansionSpan = previousExpansion.Item1;
TextSelectionMode previousExpansionSelectionMode = previousExpansion.Item2;
textView.Selection.Mode = previousExpansionSelectionMode;
textView.Selection.Select(previousExpansionSpan.Start, previousExpansionSpan.End);
}
}
finally
{
this.ignoreSelectionChangedEvent = false;
}
return true;//return true if command is handled
}
private void OnSelectionChanged(object sender, EventArgs eventArgs)
{
if (!this.ignoreSelectionChangedEvent)
{
this.previousExpansionsStack.Clear();
}
}
private ITextStructureNavigator GetNavigator(ITextView textView)
=> this.navigatorSelectorService.GetTextStructureNavigator(textView.TextBuffer);
}
}
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