mirror of
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200 lines
6.9 KiB
C#
200 lines
6.9 KiB
C#
/*
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* Copyright 2019 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Windows.Controls;
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using CommonUtil;
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namespace SourceGen {
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/// <summary>
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/// Tracks the items selected in the DisplayList, using forwarded SelectionChanged events.
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/// When enumerated, provides an ordered list of selected indices.
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/// </summary>
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/// <remarks>
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/// In WPF you can't get indices, only items, so we have to store the item index in the
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/// item itself.
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/// </remarks>
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public class DisplayListSelection : IEnumerable<int> {
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private BitArray mSelection;
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/// <summary>
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/// Retrieves the total number of boolean values in the set. This is NOT the
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/// number of selected items.
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/// </summary>
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public int Length { get { return mSelection.Length; } }
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/// <summary>
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/// Retrieves the number of values that are set.
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/// </summary>
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public int Count { get; private set; }
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/// <summary>
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/// Sets or gets the Nth element. True means the line is selected.
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/// </summary>
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public bool this[int key] {
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get {
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return mSelection[key];
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}
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set {
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// If an entry has changed, update the count of set items.
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if (mSelection[key] != value) {
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Count += value ? 1 : -1;
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mSelection[key] = value;
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}
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Debug.Assert(Count >= 0 && Count <= Length);
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}
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}
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/// <summary>
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/// Constructs an empty list.
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/// </summary>
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public DisplayListSelection() {
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mSelection = new BitArray(0);
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}
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/// <summary>
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/// Constructs a list of the specified length.
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/// </summary>
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/// <param name="length">Number of elements.</param>
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public DisplayListSelection(int length) {
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mSelection = new BitArray(length);
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}
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/// <summary>
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/// Returns an enumeration of selected indices, in ascending order.
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/// </summary>
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public IEnumerator<int> GetEnumerator() {
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for (int i = 0; i < mSelection.Length; i++) {
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if (mSelection[i]) {
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yield return i;
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}
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}
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}
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IEnumerator IEnumerable.GetEnumerator() {
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return GetEnumerator();
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}
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/// <summary>
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/// Sets the length of the selection array.
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///
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/// If the new length is longer, the new elements are initialized to false. If the
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/// new length is shorter, the excess elements are discarded.
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/// </summary>
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/// <param name="length">New length.</param>
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//public void SetLength(int length) {
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// mSelection.Length = length;
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//}
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/// <summary>
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/// Handles selection change.
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/// </summary>
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/// <param name="e">Argument from SelectionChanged event.</param>
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public void SelectionChanged(SelectionChangedEventArgs e) {
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Debug.WriteLine("SelectionChanged event: Add=" + e.AddedItems.Count +
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" Rem=" + e.RemovedItems.Count);
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foreach (DisplayList.FormattedParts parts in e.AddedItems) {
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Debug.Assert(parts.ListIndex >= 0 && parts.ListIndex < mSelection.Length);
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this[parts.ListIndex] = true;
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}
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foreach (DisplayList.FormattedParts parts in e.RemovedItems) {
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Debug.Assert(parts.ListIndex >= 0);
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if (parts.ListIndex < mSelection.Length) {
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this[parts.ListIndex] = false;
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} else {
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Debug.WriteLine("Attempted to remove selected item off end of list: " + parts);
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}
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}
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}
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/// <summary>
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/// Returns the index of the first selected item, or -1 if nothing is selected.
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/// </summary>
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public int GetFirstSelectedIndex() {
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int idx;
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for (idx = 0; idx < mSelection.Length; idx++) {
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if (mSelection[idx]) {
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break;
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}
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}
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if (idx == mSelection.Length) {
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idx = -1;
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}
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return idx;
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}
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/// <summary>
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/// Returns the index of the last selected item, or -1 if nothing is selected.
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/// </summary>
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public int GetLastSelectedIndex() {
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int idx;
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for (idx = mSelection.Length - 1; idx >= 0; idx--) {
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if (mSelection[idx]) {
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break;
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}
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}
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return idx;
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}
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/// <summary>
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/// Returns true if all items are selected.
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/// </summary>
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public bool IsAllSelected() {
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return Count == Length;
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}
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/// <summary>
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/// Confirms that the selection count matches the number of set bits. Pass
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/// in {ListView}.SelectedIndices.Count.
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/// </summary>
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/// <param name="expected">Expected number of selected entries.</param>
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/// <returns>True if count matches.</returns>
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public bool DebugValidateSelectionCount(int expected) {
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if (Count != expected) {
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Debug.WriteLine("SelectionCount expected " + expected + ", count=" + Count);
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}
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int computed = 0;
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foreach (bool bit in mSelection) {
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if (bit) {
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computed++;
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}
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}
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if (Count != computed) {
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Debug.WriteLine("SelectionCount internal error: computed=" + computed +
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", count=" + Count);
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}
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return (Count == expected);
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}
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public void DebugDump() {
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RangeSet rangeSet = new RangeSet();
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for (int i = 0; i < mSelection.Length; i++) {
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if (mSelection[i]) {
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rangeSet.Add(i);
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}
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}
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Debug.WriteLine("DisplayListSelection ranges:");
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IEnumerator<RangeSet.Range> iter = rangeSet.RangeListIterator;
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while (iter.MoveNext()) {
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RangeSet.Range range = iter.Current;
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Debug.WriteLine(" [" + range.Low.ToString() + "," + range.High.ToString() + "]");
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}
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}
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}
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}
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