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POC# - Resize ListView with "lag"
 

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  1. POC# - Resize ListView with "lag"
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    <p>I am trying to resize evenly all the columns of a <code>ListView</code> and it works as it should, but the code I made is making the screen flash and blink too much...I wonder what may I fix on the code to make it run smoothly? Here is the code:</p> <pre><code>using System; using System.Collections.Generic; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO; using System.Runtime.InteropServices; namespace Test_ListViews { public partial class Form1 : Form { Double[] pesos; private bool resizing = false; private bool limpando = false; public Form1() { InitializeComponent(); int i = 0; float dx = 96; Graphics g = this.CreateGraphics(); try { dx = g.DpiX; } finally { g.Dispose(); } pesos = new Double[listView1.Columns.Count]; // usado para o resize das colunas da ListView ser proporcional. for (i = 0; i &lt; listView1.Columns.Count; i++) pesos[i] = ((Double)listView1.Columns[i].Width * dx) / (listView1.Width * 96); _listView1_Resize(); listView1.FullRowSelect = true; this.listView1.Resize += new System.EventHandler(this.listView1_Resize); this.listView1.ColumnWidthChanged += new System.Windows.Forms.ColumnWidthChangedEventHandler(this.listView1_ColumnWidthChanged); } private void bntFill_Click(object sender, EventArgs e) { int i = 0; for (i = 0; i &lt; 5; i++) { ListViewItem item = new ListViewItem("Test 1"); item.SubItems.Add("Test 2"); item.SubItems.Add("Test 3"); item.SubItems.Add("Test 4"); item.SubItems.Add("Test 5"); item.SubItems.Add("Test 6"); item.SubItems.Add("Test 7"); item.SubItems.Add("Test 8"); item.SubItems.Add("Test 9"); listView1.Items.Add(item); } SetWindowTheme(listView1.Handle, "Explorer", null); } [DllImport("uxtheme.dll")] public static extern int SetWindowTheme([In] IntPtr hwnd, [In, MarshalAs(UnmanagedType.LPWStr)] string pszSubAppName, [In, MarshalAs(UnmanagedType.LPWStr)] string pszSubIdList); private void btnDelete_Click(object sender, EventArgs e) { ArrayList list = new ArrayList(); foreach(ListViewItem item in listView1.SelectedItems ) { list.Add(item); } foreach (ListViewItem item in list) { listView1.Items.Remove(item); } } private void listView1_Resize(object sender, System.EventArgs e) { _listView1_Resize(); } private void _listView1_Resize() { if (resizing == false &amp;&amp; pesos != null) { resizing = true; Int32 largura = listView1.Width; int i = 0; for (i = 0; i &lt; listView1.Columns.Count; i++) { listView1.Columns[i].Width = Convert.ToInt32(pesos[i] * largura); } if (listView1.Controls.Count &gt; 0) { Int32 x = listView1.Items[0].SubItems[listView1.Items[0].SubItems.Count - 1].Bounds.Location.X + 3;//pegando a referencia da ultima coluna. for (i = 0; i &lt; listView1.Controls.Count; i++) { listView1.Controls[i].Location = new System.Drawing.Point(x, listView1.Controls[i].Location.Y); listView1.Controls[i].Width = listView1.Columns[listView1.Columns.Count - 1].Width - 9; } } if (listView1.Items.Count &gt; 8) { listView1.Columns[listView1.Columns.Count - 1].Width -= 10; } listView1.Scrollable = false; listView1.Scrollable = true; resizing = false; } SetWindowTheme(listView1.Handle, "Explorer", null); } private void listView1_ColumnWidthChanged(object sender, ColumnWidthChangedEventArgs e) { _listView1_Resize(); //int i = 0; //for (i = 0; i &lt; listView1.Columns.Count; i++) //{ // if (listView1.Columns[i].Width &lt; 20) // listView1.Columns[i].Width = 20; //} } } } </code></pre> <p>Thanks!! </p>
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