datagridview-date-calendar-editor ソースコード全文
DataGridView_CalendarCell.slnx
<Solution> <Project Path="DataGridView_CalendarCell/DataGridView_CalendarCell.csproj" /></Solution>DataGridView_CalendarCell/DataGridView_CalendarCell.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup> <OutputType>WinExe</OutputType> <TargetFramework>net10.0-windows</TargetFramework> <Nullable>enable</Nullable> <UseWindowsForms>true</UseWindowsForms> <ImplicitUsings>enable</ImplicitUsings> </PropertyGroup>
</Project>DataGridView_CalendarCell/DataGridView_CalendarCell.csproj.user
<?xml version="1.0" encoding="utf-8"?><Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <ItemGroup> <Compile Update="Form1.cs"> <SubType>Form</SubType> </Compile> </ItemGroup></Project>DataGridView_CalendarCell/Form1.cs
using System.Data;
namespace DataGridView_CalendarCell;
public partial class Form1 : Form{ private DataTable _employeeTable = new DataTable();
// セルの上にピッタリ重ね合わせるためのカレンダーコントロール private DateTimePicker _dateTimePicker = new DateTimePicker();
public Form1() { InitializeComponent(); InitializeData(); InitializeDataGridView(); InitializeDateTimePicker(); // カレンダーの初期設定 }
private void InitializeData() { // 添付画像のイメージに合わせたデータ構造 _employeeTable.Columns.Add("ID", typeof(int)); _employeeTable.Columns.Add("FirstName", typeof(string)); _employeeTable.Columns.Add("LastName", typeof(string)); _employeeTable.Columns.Add("Date", typeof(string)); // 日付列
_employeeTable.Rows.Add(1, "John", "Smith", DateTime.Today.AddDays(-5).ToShortDateString()); _employeeTable.Rows.Add(2, "John", "Johnson", DateTime.Today.AddDays(-3).ToShortDateString()); _employeeTable.Rows.Add(3, "Mike", "Brown", DateTime.Today.ToShortDateString()); }
private void InitializeDataGridView() { dataGridView1.DataSource = _employeeTable; dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
// 1. 編集開始・終了、およびスクロール時のイベントを購読 dataGridView1.CellBeginEdit += DataGridView1_CellBeginEdit; dataGridView1.CellEndEdit += DataGridView1_CellEndEdit; dataGridView1.Scroll += DataGridView1_Scroll; // スクロールズレ対策 }
private void InitializeDateTimePicker() { // 2. カレンダーコントロールを初期状態では非表示にして DataGridView の子要素として追加 _dateTimePicker.Visible = false; _dateTimePicker.Format = DateTimePickerFormat.Short; // 「YYYY/MM/DD」形式で表示
// カレンダーのドロップダウンが閉じられた時のイベントを購読 _dateTimePicker.CloseUp += DateTimePicker_CloseUp;
dataGridView1.Controls.Add(_dateTimePicker); }
/// <summary> /// セルの編集が始まったときに呼び出されるイベント /// </summary> private void DataGridView1_CellBeginEdit(object? sender, DataGridViewCellCancelEventArgs e) { // 「Date」列以外は何もしない if (dataGridView1.Columns[e.ColumnIndex].Name != "Date") return;
// 3. 現在編集しようとしているセルの「画面上の位置とサイズ」を取得 Rectangle rect = dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, true);
// カレンダーをセルの大きさと位置に合わせる _dateTimePicker.Size = rect.Size; _dateTimePicker.Location = rect.Location;
// 4. 現在セルに入っている日付文字列を解析し、カレンダーの初期値としてセット if (DateTime.TryParse(dataGridView1[e.ColumnIndex, e.RowIndex].Value?.ToString(), out DateTime dt)) { _dateTimePicker.Value = dt; } else { _dateTimePicker.Value = DateTime.Today; // 変換できなければ今日の日付 }
// カレンダーを表示させてフォーカスを移す _dateTimePicker.Visible = true; _dateTimePicker.Focus(); }
/// <summary> /// セルの編集が終了するときに呼び出されるイベント /// </summary> private void DataGridView1_CellEndEdit(object? sender, DataGridViewCellEventArgs e) { if (dataGridView1.Columns[e.ColumnIndex].Name != "Date") return;
// 5. カレンダーで選択された日付を、セルの値へ書き戻す if (_dateTimePicker.Visible) { dataGridView1[e.ColumnIndex, e.RowIndex].Value = _dateTimePicker.Value.ToShortDateString(); _dateTimePicker.Visible = false; // カレンダーを使用後は非表示にする } }
/// <summary> /// カレンダーのドロップダウン（カレンダー画面）が閉じられたときのイベント /// </summary> private void DateTimePicker_CloseUp(object? sender, EventArgs e) { // 6. 日付が選択されてカレンダーが閉じたら、明示的にセルの編集モードを終了（確定）させる // これを呼ぶことで、自動的に上記の「CellEndEdit」イベントが誘発されます dataGridView1.EndEdit(); }
/// <summary> /// グリッドがスクロールされたときのイベント /// </summary> private void DataGridView1_Scroll(object? sender, ScrollEventArgs e) { // カレンダーが表示されたままスクロールされると位置がズレるため、強制的に編集を終了して隠す if (_dateTimePicker.Visible) { _dateTimePicker.Visible = false; dataGridView1.EndEdit(); } }}DataGridView_CalendarCell/Form1.Designer.cs
namespace DataGridView_CalendarCell{ partial class Form1 { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components = null;
/// <summary> /// Clean up any resources being used. /// </summary> /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); }
#region Windows Form Designer generated code
/// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { dataGridView1 = new DataGridView(); ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit(); SuspendLayout(); // // dataGridView1 // dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize; dataGridView1.Dock = DockStyle.Fill; dataGridView1.Location = new Point(0, 0); dataGridView1.Name = "dataGridView1"; dataGridView1.RowHeadersWidth = 62; dataGridView1.Size = new Size(800, 450); dataGridView1.TabIndex = 0; // // Form1 // AutoScaleDimensions = new SizeF(10F, 25F); AutoScaleMode = AutoScaleMode.Font; ClientSize = new Size(800, 450); Controls.Add(dataGridView1); Name = "Form1"; Text = "Form1"; ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit(); ResumeLayout(false); }
#endregion
private DataGridView dataGridView1; }}DataGridView_CalendarCell/Form1.resx
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namespace DataGridView_CalendarCell{ internal static class Program { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { // To customize application configuration such as set high DPI settings or default font, // see https://aka.ms/applicationconfiguration. ApplicationConfiguration.Initialize(); Application.Run(new Form1()); } }}