Question

环境：VS 2008，.NET 2.0，WinForms

我在Tile模式下有一个listview。某些项目具有关联的图像。有些人没有。

当用户点击某些控件时，内容（列表视图项）通常会更新。发生这种情况时，有时似乎没有新项目有图像。在这种情况下，我想摆脱为图像保留的项目左侧的空白区域。我尝试了以下伪代码来暂时删除图像列表

list.Items.Clear();
FillList();
list.LargeImageList= (none of the items has image) ? null : MyImageList;

但它不起作用：空的空间仍然存在。我也尝试重新绘制控件，但无济于事。

alt text http://apptranslator.com/_so/so_list1.jpg alt text http://apptranslator.com/_so/so_list2.jpg alt text http://apptranslator.com/_so/so_list3.jpg

左：列出图像。

中：没有图像的列表。图像空间可见。

正确：当没有图像时，我希望如何。

编辑：我也做了这个测试：不要在设计器中分配图像列表。如果第一个显示器不包含任何图像，那么我会得到预期的结果。然后我点击显示图像（我得到它们）。我再次点击返回无图像选择：图像空间不会消失。

另外，哈斯，不，我不使用小图像或状态图像。只有大图片。

我该怎么办？ TIA。

Answer 1

你确定吗？我已经在这个测试用例中工作了：

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());
    }
}

我已经做到了你现在所看到的，我无法理解为什么它没有进行调整...我想知道如果做一个SendMessage会做的伎俩，但我duno它会是什么消息。

如果你这样做，我可以看到最好的工作：

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

我创建了一个测试版，除非我设置StateImageList，否则它似乎有效。你还要清除StateImageList吗？

Answer 2

如果您想要完全控制，请使用listview.drawitem事件。

Answer 3

我最近也遇到了这个问题。我注意到的是，无论LargeImageList ImageSize设置为什么（或者即使LargeImageList为NULL！），ListView也总是表现为LargeImageList.ImageSize仍然设置为它的最后一个值。

在我的程序中，我根本没有使用SmallImageList，所以它一直都是NULL。在我的表单构造函数中，我只是将它设置为ListView的新ImageList（）并将大小锁定在（1,1）。问题消失了！看起来就像一个愚蠢的虫子。

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

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

        RefreshItems();
    }

如何在ListView中回收图像不动产？

3 个答案: