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6502bench/SourceGen/Tools/VirtualHexDump.cs
2019-07-20 13:28:37 -07:00

197 lines
6.6 KiB
C#

/*
* Copyright 2019 faddenSoft
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics;
using Asm65;
namespace SourceGen.Tools {
/// <summary>
/// Generates formatted hex dump lines, and makes them available as a list. The result
/// is suitable for use with WPF ItemsSource. Items are generated on demand, providing
/// data virtualization.
/// </summary>
/// <remarks>
/// Doing proper data virtualization in WPF is tricky and annoying. We just render on
/// demand and retain the results indefinitely.
/// </remarks>
public class VirtualHexDump : IList, INotifyCollectionChanged, INotifyPropertyChanged {
/// <summary>
/// <summary>
/// Data to display. We currently require that the entire file fit in memory,
/// which is reasonable because we impose a 2^24 (16MB) limit.
/// </summary>
private byte[] mData;
/// <summary>
/// Data formatter object.
/// </summary>
private Formatter mFormatter;
private string[] mLines;
// Tracks the number of lines we've generated, so we can see if virtualization is
// actually happening.
private int mDebugGenLineCount;
public VirtualHexDump(byte[] data, Formatter formatter) {
mData = data;
mFormatter = formatter;
Count = (mData.Length + 15) / 16;
mLines = new string[Count];
mDebugGenLineCount = 0;
}
/// <summary>
/// Causes all lines to be reformatted. Call this after changing the desired format.
/// Generates a collection-reset event, which may cause loss of selection.
/// </summary>
public void Reformat(Formatter newFormat) {
mFormatter = newFormat;
for (int i = 0; i < mLines.Length; i++) {
mLines[i] = null;
}
OnPropertyChanged(CountString);
OnPropertyChanged(IndexerName);
OnCollectionReset();
}
/// <summary>
/// Returns the Nth line, generating it if it hasn't been yet.
/// </summary>
private string GetLine(int index) {
if (mLines[index] == null) {
mLines[index] = mFormatter.FormatHexDump(mData, index * 16);
if ((++mDebugGenLineCount % 1000) == 0) {
//Debug.WriteLine("DebugGenLineCount: " + mDebugGenLineCount);
}
}
//Debug.WriteLine("GET LINE " + index + ": " + mLines[index]);
return mLines[index];
}
#region Property / Collection Changed
public event NotifyCollectionChangedEventHandler CollectionChanged;
public event PropertyChangedEventHandler PropertyChanged;
private const string CountString = "Count";
private const string IndexerName = "Item[]";
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e) {
PropertyChanged?.Invoke(this, e);
}
private void OnPropertyChanged(string propertyName) {
OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}
protected virtual void OnCollectionChanged(NotifyCollectionChangedEventArgs e) {
CollectionChanged?.Invoke(this, e);
}
private void OnCollectionReset() {
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
#endregion Property / Collection Changed
#region IList
public bool IsReadOnly => true;
public bool IsFixedSize => true;
public int Count { get; private set; }
public object SyncRoot => throw new NotImplementedException();
public bool IsSynchronized => false;
public object this[int index] {
get => GetLine(index);
set => throw new NotImplementedException();
}
public int Add(object value) {
throw new NotImplementedException();
}
public bool Contains(object value) {
return (IndexOf(value) >= 0);
}
public void Clear() {
throw new NotImplementedException();
}
public int IndexOf(object value) {
//Debug.WriteLine("VHD IndexOf " + value);
// This gets called sometimes when the selection changes, because the selection
// mechanism tracks objects rather than indices. Fortunately we can convert the
// value string to an index by parsing the first six characters. (This is
// somewhat fragile as it relies on the way Formatter formats the string. Might
// want to make offset-from-hexdump-string a Formatter method.)
int offset = Convert.ToInt32(((string)value).Substring(0, 6), 16);
int index = offset / 16;
// Either the object at the target location matches, or it doesn't; no need to
// search. We'll get requests for nonexistent objects after we reformat the
// collection, when the list control tries to find the selected items.
//
// Object equality is what's desired; no need for string comparison
if ((object)mLines[index] == value) {
return index;
}
//Debug.WriteLine(" IndexOf not found");
return -1;
}
public void Insert(int index, object value) {
throw new NotImplementedException();
}
public void Remove(object value) {
throw new NotImplementedException();
}
public void RemoveAt(int index) {
throw new NotImplementedException();
}
public void CopyTo(Array array, int index) {
throw new NotImplementedException();
}
public IEnumerator GetEnumerator() {
// Use the indexer, rather than mLines's enumerator, to get on-demand string gen.
for (int i = 0; i < mLines.Length; i++) {
yield return this[i];
}
}
#endregion IList
}
}