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使用ListView时#xff0c;希望可以在单元格显示图片或其他控件#xff0c;发现原生的ListView不支持#xff0c;于是通过拓展#xff0c;实现ListView可以显示任意控件的功能#xff0c;效果如下#xff1a;
实现方法
本来想着在单元格里面实现控件的自绘的…功能说明
使用ListView时希望可以在单元格显示图片或其他控件发现原生的ListView不支持于是通过拓展实现ListView可以显示任意控件的功能效果如下
实现方法
本来想着在单元格里面实现控件的自绘的但是没找到办法最后是通过在单元格的表面显示对应控件的浮于表面达到目的。 实现要点如下
ListView需要设置OwnerDrawtrue并重载自绘函数OnDrawColumnHeader、OnDrawItem、OnDrawSubItem支持按单元格添加对应的控件其Parent设置为列表ListView列表界面调整后包括大小、列表头、滚动等需重新绘制单元格的控件
实现源码
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace MyListView.Ui
{#region ListViewExpublic class ListViewEx : ListView{#region 内部属性/// summary/// 存放单元格控件/// /summaryListControl _CellControls new ListControl();/// summary/// 界面是否发生变化/// /summarybool IsViewChanged { get; set; }#endregion#region 方法/// summary/// 构造函数/// /summarypublic ListViewEx(){#region 初始化#endregion#region 事件this.ColumnReordered ColumnWidthChangedHandler;this.ColumnWidthChanged ColumnWidthChangedHandler;#endregion}/// summary/// 添加控件/// /summary/// typeparam nameT/typeparam/// param namerow/param/// param namecol/param/// param namec/param/// returns/returnspublic T AddT(int row, int col, T c) where T : Control{if(row this.Items.Count || col this.Columns.Count){return null;}var index (row * this.Columns.Count) col;for (var i _CellControls.Count; i index; i){_CellControls.Add(null);}var oc _CellControls[index];if (oc ! null){oc.Dispose();}OwnerDraw true;IsViewChanged true;c.Parent this;_CellControls[index] c;return c;}/// summary/// 设置行高度/// /summary/// param nameheight/parampublic void SetItemHeight(int height){if(this.SmallImageList null){this.SmallImageList new ImageList();}this.SmallImageList.ImageSize new Size(1, height);}#endregion#region 内部函数void ColumnWidthChangedHandler(object s, EventArgs e){IsViewChanged true;}/// summary/// 显示控件到目标单元格/// /summary/// param namec/param/// param nameitem/paramvoid ShowCellControl(Control c, ListViewItem.ListViewSubItem item){int margin 2;c.Text item.Text;c.Visible true;c.Bounds new Rectangle(item.Bounds.X margin,item.Bounds.Top margin,item.Bounds.Width - 2 * margin,item.Bounds.Height - 2 * margin);}/// summary/// 显示单元格控件/// /summary/// param namee/param/// returns/returnsControl GetCellControl(DrawListViewSubItemEventArgs e){Control c null;#region 获取控件var index (e.ItemIndex * this.Columns.Count) e.ColumnIndex;if (index _CellControls.Count){return null;}c _CellControls[index];#endregionreturn c;}protected override void WndProc(ref Message m){#region 事件定义const int WM_SIZE 0x0005;const int WM_PAINT 0x000F;const int WM_HSCROLL 0x114;const int WM_VSCROLL 0x115;const int WM_MOUSEWHEEL 0x020A;#endregion#region 重绘显示控件if (m.Msg WM_PAINT IsViewChanged){if(this.Columns.Count 0){for (var i 0; i _CellControls.Count; i){var cell_control _CellControls[i];if (cell_control null){continue;}cell_control.Visible false;var row i / this.Columns.Count;var col i % this.Columns.Count;if(row Items.Count || col this.Columns.Count){continue;}var item this.Items[row];if(item.Bounds.Y 0 || item.Bounds.Y this.Height){continue;}if(item.SubItems[col].Bounds.X 0 || item.SubItems[col].Bounds.X this.Width){continue;}ShowCellControl(cell_control, item.SubItems[col]);}IsViewChanged false;}}else if(m.Msg WM_HSCROLL || m.Msg WM_VSCROLL || m.Msg WM_MOUSEWHEEL || m.Msg WM_SIZE){IsViewChanged true;}#endregionbase.WndProc(ref m);}protected override void OnDrawColumnHeader(DrawListViewColumnHeaderEventArgs e){e.DrawDefault true;}protected override void OnDrawItem(DrawListViewItemEventArgs e){// 已经在OnDrawSubItem处理过了// e.DrawText(TextFormatFlags.Default);}protected override void OnDrawSubItem(DrawListViewSubItemEventArgs e){if(GetCellControl(e) ! null){return;}else{e.DrawDefault true;}}#endregion}#endregion
}测试代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace MyListView
{public partial class Form1 : Form{#region 函数public Form1(){#region 布局初始化InitializeComponent();var lv new Ui.ListViewEx(){Dock DockStyle.Fill,View View.Details,GridLines true,};this.Controls.Add(lv);var headers new string[] { 序号, 名称, 年龄, 住址, 荣誉, 岗位, 头像 };foreach(var v in headers){lv.Columns.Add(v, 100, HorizontalAlignment.Center);}lv.SetItemHeight(40);for(var i0; i50; i){var lvi lv.Items.Add($数据{i 1});for(var j1; jlv.Columns.Count; j){lvi.SubItems.Add($数据{i 1}-{j});switch(j){case 1:lv.Add(i, j, new Label());break;case 2:lv.Add(i, j, new Button());break;case 3:lv.Add(i, j, new TextBox(){Font new Font(宋体, 18)});break;case 4:lv.Add(i, j, new ComboBox(){Font new Font(宋体, 18)});break;case 6:{var pic lv.Add(i, j, new PictureBox());pic.Image LoadImage($logo{i%7}.jpg);pic.SizeMode PictureBoxSizeMode.StretchImage;}break;}}}#endregion}Image LoadImage(string name){var file Path.GetFullPath(Path.Combine(..\..\Data\IMG, name));if(!File.Exists(file)){return null;}return Image.FromFile(file);}#endregion}
}
