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84 lines
3.2 KiB
C#
84 lines
3.2 KiB
C#
/*
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* Copyright 2018 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.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace CommonWinForms {
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// From https://stackoverflow.com/questions/1019388/
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/// <summary>
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/// Unpleasant hackery to make "select all" faster. With 500K items it takes about 24
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/// seconds to select everything individually, and there isn't a better way. With this
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/// it only takes a few milliseconds.
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/// </summary>
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public class NativeMethods {
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private const int LVM_FIRST = 0x1000;
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private const int LVM_SETITEMSTATE = LVM_FIRST + 43;
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
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public struct LVITEM {
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public int mask;
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public int iItem;
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public int iSubItem;
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public int state;
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public int stateMask;
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[MarshalAs(UnmanagedType.LPTStr)]
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public string pszText;
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public int cchTextMax;
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public int iImage;
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public IntPtr lParam;
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public int iIndent;
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public int iGroupId;
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public int cColumns;
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public IntPtr puColumns;
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};
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[DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = CharSet.Auto)]
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public static extern IntPtr SendMessageLVItem(IntPtr hWnd, int msg, int wParam, ref LVITEM lvi);
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/// <summary>
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/// Select all rows on the given listview
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/// </summary>
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/// <param name="list">The listview whose items are to be selected</param>
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public static void SelectAllItems(ListView list) {
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NativeMethods.SetItemState(list, -1, 2, 2);
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}
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/// <summary>
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/// Deselect all rows on the given listview
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/// </summary>
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/// <param name="list">The listview whose items are to be deselected</param>
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public static void DeselectAllItems(ListView list) {
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NativeMethods.SetItemState(list, -1, 2, 0);
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}
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/// <summary>
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/// Set the item state on the given item
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/// </summary>
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/// <param name="list">The listview whose item's state is to be changed</param>
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/// <param name="itemIndex">The index of the item to be changed</param>
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/// <param name="mask">Which bits of the value are to be set?</param>
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/// <param name="value">The value to be set</param>
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public static void SetItemState(ListView list, int itemIndex, int mask, int value) {
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LVITEM lvItem = new LVITEM();
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lvItem.stateMask = mask;
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lvItem.state = value;
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SendMessageLVItem(list.Handle, LVM_SETITEMSTATE, itemIndex, ref lvItem);
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}
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}
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}
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