Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridViewTextBoxEditingControl.cs / 1 / DataGridViewTextBoxEditingControl.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Drawing; using System.Security.Permissions; using System.Diagnostics; using System.Runtime.InteropServices; ///[ ComVisible(true), ClassInterface(ClassInterfaceType.AutoDispatch) ] public class DataGridViewTextBoxEditingControl : TextBox, IDataGridViewEditingControl { private static readonly DataGridViewContentAlignment anyTop = DataGridViewContentAlignment.TopLeft | DataGridViewContentAlignment.TopCenter | DataGridViewContentAlignment.TopRight; private static readonly DataGridViewContentAlignment anyRight = DataGridViewContentAlignment.TopRight | DataGridViewContentAlignment.MiddleRight | DataGridViewContentAlignment.BottomRight; private static readonly DataGridViewContentAlignment anyCenter = DataGridViewContentAlignment.TopCenter | DataGridViewContentAlignment.MiddleCenter | DataGridViewContentAlignment.BottomCenter; private DataGridView dataGridView; private bool valueChanged; private bool repositionOnValueChange; private int rowIndex; /// public DataGridViewTextBoxEditingControl() : base() { this.TabStop = false; } /// public virtual DataGridView EditingControlDataGridView { get { return this.dataGridView; } set { this.dataGridView = value; } } /// public virtual object EditingControlFormattedValue { get { return GetEditingControlFormattedValue(DataGridViewDataErrorContexts.Formatting); } set { this.Text = (string) value; } } /// public virtual int EditingControlRowIndex { get { return this.rowIndex; } set { this.rowIndex = value; } } /// public virtual bool EditingControlValueChanged { get { return this.valueChanged; } set { this.valueChanged = value; } } /// public virtual Cursor EditingPanelCursor { get { return Cursors.Default; } } /// public virtual bool RepositionEditingControlOnValueChange { get { return this.repositionOnValueChange; } } /// public virtual void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle) { this.Font = dataGridViewCellStyle.Font; if (dataGridViewCellStyle.BackColor.A < 255) { // Our TextBox does not support transparent back colors Color opaqueBackColor = Color.FromArgb(255, dataGridViewCellStyle.BackColor); this.BackColor = opaqueBackColor; this.dataGridView.EditingPanel.BackColor = opaqueBackColor; } else { this.BackColor = dataGridViewCellStyle.BackColor; } this.ForeColor = dataGridViewCellStyle.ForeColor; if (dataGridViewCellStyle.WrapMode == DataGridViewTriState.True) { this.WordWrap = true; } this.TextAlign = TranslateAlignment(dataGridViewCellStyle.Alignment); this.repositionOnValueChange = (dataGridViewCellStyle.WrapMode == DataGridViewTriState.True && (dataGridViewCellStyle.Alignment & anyTop) == 0); } /// public virtual bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey) { switch (keyData & Keys.KeyCode) { case Keys.Right: // If the end of the selection is at the end of the string // let the DataGridView treat the key message if ((this.RightToLeft == RightToLeft.No && !(this.SelectionLength == 0 && this.SelectionStart == this.Text.Length)) || (this.RightToLeft == RightToLeft.Yes && !(this.SelectionLength == 0 && this.SelectionStart == 0))) { return true; } break; case Keys.Left: // If the end of the selection is at the begining of the string // or if the entire text is selected and we did not start editing // send this character to the dataGridView, else process the key event if ((this.RightToLeft == RightToLeft.No && !(this.SelectionLength == 0 && this.SelectionStart == 0)) || (this.RightToLeft == RightToLeft.Yes && !(this.SelectionLength == 0 && this.SelectionStart == this.Text.Length))) { return true; } break; case Keys.Down: // If the end of the selection is on the last line of the text then // send this character to the dataGridView, else process the key event int end = this.SelectionStart + this.SelectionLength; if (this.Text.IndexOf("\r\n", end) != -1) { return true; } break; case Keys.Up: // If the end of the selection is on the first line of the text then // send this character to the dataGridView, else process the key event if (!(this.Text.IndexOf("\r\n") < 0 || this.SelectionStart + this.SelectionLength < this.Text.IndexOf("\r\n"))) { return true; } break; case Keys.Home: case Keys.End: if (this.SelectionLength != this.Text.Length) { return true; } break; case Keys.Prior: case Keys.Next: if (this.valueChanged) { return true; } break; case Keys.Delete: if (this.SelectionLength > 0 || this.SelectionStart < this.Text.Length) { return true; } break; case Keys.Enter: if ((keyData & (Keys.Control | Keys.Shift | Keys.Alt)) == Keys.Shift && this.Multiline && this.AcceptsReturn) { return true; } break; } return !dataGridViewWantsInputKey; } /// public virtual object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context) { return this.Text; } /// public virtual void PrepareEditingControlForEdit(bool selectAll) { if (selectAll) { SelectAll(); } else { // Do not select all the text, but // position the caret at the end of the text this.SelectionStart = this.Text.Length; } } private void NotifyDataGridViewOfValueChange() { this.valueChanged = true; this.dataGridView.NotifyCurrentCellDirty(true); } /// protected override void OnMouseWheel(MouseEventArgs e) { // Forwarding to grid control. Can't prevent the TextBox from handling the mouse wheel as expected. this.dataGridView.OnMouseWheelInternal(e); } /// protected override void OnTextChanged(EventArgs e) { base.OnTextChanged(e); // Let the DataGridView know about the value change NotifyDataGridViewOfValueChange(); } /// [ SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode), ] protected override bool ProcessKeyEventArgs(ref Message m) { switch ((Keys)(int) m.WParam) { case Keys.Enter: if (m.Msg == NativeMethods.WM_CHAR && !(ModifierKeys == Keys.Shift && this.Multiline && this.AcceptsReturn)) { // Ignore the Enter key and don't add it to the textbox content. This happens when failing validation brings // up a dialog box for example. // Shift-Enter for multiline textboxes need to be accepted however. return true; } break; case Keys.LineFeed: if (m.Msg == NativeMethods.WM_CHAR && ModifierKeys == Keys.Control && this.Multiline && this.AcceptsReturn) { // Ignore linefeed character when user hits Ctrl-Enter to commit the cell. return true; } break; case Keys.A: if (m.Msg == NativeMethods.WM_KEYDOWN && ModifierKeys == Keys.Control) { SelectAll(); return true; } break; } return base.ProcessKeyEventArgs(ref m); } private static HorizontalAlignment TranslateAlignment(DataGridViewContentAlignment align) { if ((align & anyRight) != 0) { return HorizontalAlignment.Right; } else if ((align & anyCenter) != 0) { return HorizontalAlignment.Center; } else { return HorizontalAlignment.Left; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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