How to reclaim image real estate in ListView?

Answer 1

Are you sure? I've got it working in this test case:

using System;
using System.Windows.Forms;
public class MainForm : Form
{
    private System.ComponentModel.IContainer components = null;
    private System.Windows.Forms.ListView listView;
    private System.Windows.Forms.ImageList emptySmallImageList;
    private System.Windows.Forms.ImageList largeImageList;
    private System.Windows.Forms.Button imageListSmallButton;
    private System.Windows.Forms.Button imageListLargeButton;

    public MainForm()
    {
        InitializeComponent();
    }

    private void OnImageListSmallButtonClick(object sender, EventArgs e)
    {
        this.listView.LargeImageList = emptySmallImageList;       
    }

    private void OnImageListLargeButtonClick(object sender, EventArgs e)
    {
        this.listView.LargeImageList = largeImageList;
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    private void InitializeComponent()
    {
        this.components = new System.ComponentModel.Container();
        System.Windows.Forms.ListViewItem listViewItem5 = new System.Windows.Forms.ListViewItem("fgsdfg");
        System.Windows.Forms.ListViewItem listViewItem6 = new System.Windows.Forms.ListViewItem("sdfgsdfg");
        System.Windows.Forms.ListViewItem listViewItem7 = new System.Windows.Forms.ListViewItem("sdfgsdfgsdfg");
        System.Windows.Forms.ListViewItem listViewItem8 = new System.Windows.Forms.ListViewItem("sdfgsdfg");
        this.listView = new System.Windows.Forms.ListView();
        this.largeImageList = new System.Windows.Forms.ImageList(this.components);
        this.emptySmallImageList = new System.Windows.Forms.ImageList(this.components);
        this.imageListSmallButton = new System.Windows.Forms.Button();
        this.imageListLargeButton = new System.Windows.Forms.Button();
        this.SuspendLayout();
        // 
        // listView
        // 
        this.listView.Dock = System.Windows.Forms.DockStyle.Fill;
        this.listView.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
        listViewItem5,
        listViewItem6,
        listViewItem7,
        listViewItem8});
        this.listView.LargeImageList = this.largeImageList;
        this.listView.Location = new System.Drawing.Point(0, 0);
        this.listView.Name = "listView";
        this.listView.Size = new System.Drawing.Size(292, 266);
        this.listView.TabIndex = 0;
        this.listView.UseCompatibleStateImageBehavior = false;
        this.listView.View = System.Windows.Forms.View.Tile;
        // 
        // largeImageList
        // 
        this.largeImageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
        this.largeImageList.ImageSize = new System.Drawing.Size(32, 32);
        this.largeImageList.TransparentColor = System.Drawing.Color.Transparent;
        // 
        // emptySmallImageList
        // 
        this.emptySmallImageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
        this.emptySmallImageList.ImageSize = new System.Drawing.Size(1, 1);
        this.emptySmallImageList.TransparentColor = System.Drawing.Color.Transparent;
        // 
        // imageListSmallButton
        // 
        this.imageListSmallButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.imageListSmallButton.Location = new System.Drawing.Point(175, 12);
        this.imageListSmallButton.Name = "imageListSmallButton";
        this.imageListSmallButton.Size = new System.Drawing.Size(95, 23);
        this.imageListSmallButton.TabIndex = 1;
        this.imageListSmallButton.Text = "ImageList 1x1";
        this.imageListSmallButton.UseVisualStyleBackColor = true;
        this.imageListSmallButton.Click += new System.EventHandler(this.OnImageListSmallButtonClick);
        // 
        // imageListLargeButton
        // 
        this.imageListLargeButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.imageListLargeButton.Location = new System.Drawing.Point(175, 53);
        this.imageListLargeButton.Name = "imageListLargeButton";
        this.imageListLargeButton.Size = new System.Drawing.Size(95, 23);
        this.imageListLargeButton.TabIndex = 2;
        this.imageListLargeButton.Text = "ImageList 32x32";
        this.imageListLargeButton.UseVisualStyleBackColor = true;
        this.imageListLargeButton.Click += new System.EventHandler(this.OnImageListLargeButtonClick);
        // 
        // MainForm
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.imageListLargeButton);
        this.Controls.Add(this.imageListSmallButton);
        this.Controls.Add(this.listView);
        this.Name = "MainForm";
        this.Text = "Form1";
        this.ResumeLayout(false);

    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MainForm());
    }
}

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I've got it doing what your seeing now, I can't understand why its not doing a resize... i wonder if Doing a SendMessage will do the trick but i duno what message it would be.

the best work arround i can see if you do this:

imageList1.ImageSize = new Size(1,1);

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I created a test one and it seemed to work unless I set the StateImageList. Are you clearing the StateImageList also?

Answer 2

If you want complete control, use the listview.drawitem event.

Answer 3

I too was having this exact issue recently. Something I noticed is that regardless of what the LargeImageList ImageSize is set to (or even if LargeImageList is NULL!), the ListView will always act as if the LargeImageList.ImageSize is still set to it's last value.

In my program, I wasn't using the SmallImageList at all, so it was NULL all along. In my constructor for the form, I just set this to a new ImageList() for the ListView and locked the size in at (1,1). Problem went away! Seemed like a dumb bug to have.

    public frmMain()
    {
        InitializeComponent();
        this.Text = Program.AppName;

        lstSightings.SmallImageList = new ImageList();
        lstSightings.SmallImageList.ImageSize = new Size(1, 1);

        RefreshItems();
    }