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using System;
using Mono.TextEditor.Highlighting;
namespace Mono.TextEditor
{
public struct Selection
{
public static readonly Selection Empty = new Selection (true);
public bool IsEmpty {
get {
return anchor.IsEmpty;
}
}
readonly DocumentLocation anchor;
public DocumentLocation Anchor {
get {
return anchor;
}
}
readonly DocumentLocation lead;
public DocumentLocation Lead {
get {
return lead;
}
}
public int MinLine {
get {
return System.Math.Min (Anchor.Line, Lead.Line);
}
}
public int MaxLine {
get {
return System.Math.Max (Anchor.Line, Lead.Line);
}
}
public DocumentLocation Start {
get {
return anchor < lead ? anchor : lead;
}
}
public DocumentLocation End {
get {
return anchor < lead ? lead : anchor;
}
}
readonly SelectionMode selectionMode;
public SelectionMode SelectionMode {
get {
return selectionMode;
}
}
public bool Contains (DocumentLocation loc)
{
return anchor <= loc && loc <= lead || lead <= loc && loc <= anchor;
}
Selection(bool empty)
{
anchor = lead = DocumentLocation.Empty;
selectionMode = SelectionMode.Normal;
}
public Selection (int anchorLine, int anchorColumn, int leadLine, int leadColumn, SelectionMode mode = SelectionMode.Normal) : this(new DocumentLocation (anchorLine, anchorColumn), new DocumentLocation (leadLine, leadColumn), mode)
{
}
public Selection (DocumentLocation anchor, DocumentLocation lead, SelectionMode selectionMode = SelectionMode.Normal)
{
if (anchor.Line < DocumentLocation.MinLine || anchor.Column < DocumentLocation.MinColumn)
throw new ArgumentOutOfRangeException ("anchor", anchor + " is out of range.");
if (lead.Line < DocumentLocation.MinLine || lead.Column < DocumentLocation.MinColumn)
throw new ArgumentOutOfRangeException ("lead", lead + " is out of range.");
this.anchor = anchor;
this.lead = lead;
this.selectionMode = selectionMode;
}
public Selection WithLead (DocumentLocation newLead)
{
return new Selection (Anchor, newLead, SelectionMode);
}
public Selection WithAnchor (DocumentLocation newAnchor)
{
return new Selection (newAnchor, Lead, SelectionMode);
}
public Selection WithRange (DocumentLocation newAnchor, DocumentLocation newLead)
{
return new Selection (newAnchor, newLead, SelectionMode);
}
public Selection WithSelectionMode (SelectionMode newSelectionMode)
{
return new Selection (Anchor, Lead, newSelectionMode);
}
public TextSegment GetSelectionRange (TextEditorData data)
{
int anchorOffset = GetAnchorOffset (data);
int leadOffset = GetLeadOffset (data);
return new TextSegment (System.Math.Min (anchorOffset, leadOffset), System.Math.Abs (anchorOffset - leadOffset));
}
// for markup syntax mode the syntax highlighting information need to be taken into account
// when calculating the selection offsets.
int PosToOffset (TextEditorData data, DocumentLocation loc)
{
DocumentLine line = data.GetLine (loc.Line);
if (line == null)
return 0;
var startChunk = data.GetChunks (line, line.Offset, line.LengthIncludingDelimiter);
int col = 1;
foreach (Chunk chunk in startChunk) {
if (col <= loc.Column && loc.Column < col + chunk.Length)
return chunk.Offset - col + loc.Column;
col += chunk.Length;
}
return line.Offset + line.Length;
}
public int GetAnchorOffset (TextEditorData data)
{
return data.Document.LocationToOffset (Anchor);
}
public int GetLeadOffset (TextEditorData data)
{
return data.Document.LocationToOffset (Lead);
}
public override bool Equals (object obj)
{
if (obj == null)
return false;
if (obj.GetType () != typeof(Selection))
return false;
Mono.TextEditor.Selection other = (Mono.TextEditor.Selection)obj;
return Anchor == other.Anchor && Lead == other.Lead && SelectionMode == other.SelectionMode;
}
public bool IsSelected (DocumentLocation loc)
{
return anchor <= loc && loc <= lead || lead <= loc && loc <= anchor;
}
public bool IsSelected (int line, int column)
{
return IsSelected (new DocumentLocation (line, column));
}
public bool IsSelected (DocumentLocation start, DocumentLocation end)
{
return IsSelected (start) && IsSelected (end);
}
public bool IsSelected (int startLine, int startColumn, int endLine, int endColumn)
{
return IsSelected (new DocumentLocation (startLine, startColumn), new DocumentLocation (endLine, endColumn));
}
public override int GetHashCode ()
{
unchecked {
return Anchor.GetHashCode () ^ Lead.GetHashCode ();
}
}
public override string ToString ()
{
return string.Format("[Selection: Anchor={0}, Lead={1}, MinLine={2}, MaxLine={3}, SelectionMode={4}]", Anchor, Lead, MinLine, MaxLine, SelectionMode);
}
}
}
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