Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridTextBox.cs / 1 / DataGridTextBox.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms{ using System.Runtime.Remoting; using System; using System.Security.Permissions; using System.Windows.Forms; using System.ComponentModel; using System.Drawing; using Microsoft.Win32; using System.Runtime.InteropServices; ////// /// [ ComVisible(true), ClassInterface(ClassInterfaceType.AutoDispatch), ToolboxItem(false), DesignTimeVisible(false), DefaultProperty("GridEditName") ] public class DataGridTextBox : TextBox { private bool isInEditOrNavigateMode = true; // only needed to signal the dataGrid that an edit // takes place private DataGrid dataGrid; ///Represents a ///control that is hosted in a /// . public DataGridTextBox() : base () { TabStop = false; } /// /// /// public void SetDataGrid(DataGrid parentGrid) { dataGrid = parentGrid; } ///Sets the ///to which this control belongs. [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] protected override void WndProc(ref Message m) { // but what if we get a CtrlV? // what about deleting from the menu? if (m.Msg == NativeMethods.WM_PASTE || m.Msg == NativeMethods.WM_CUT || m.Msg == NativeMethods.WM_CLEAR) { IsInEditOrNavigateMode = false; dataGrid.ColumnStartedEditing(Bounds); } base.WndProc(ref m); } /// protected override void OnMouseWheel(MouseEventArgs e) { dataGrid.TextBoxOnMouseWheel(e); } /// /// /// protected override void OnKeyPress(KeyPressEventArgs e) { base.OnKeyPress(e); // Shift-Space should not cause the grid to // be put in edit mode if (e.KeyChar == ' ' && (Control.ModifierKeys & Keys.Shift) == Keys.Shift) return; // if the edit box is in ReadOnly mode, then do not tell the DataGrid about the // edit if (this.ReadOnly) return; // Ctrl-* should not put the grid in edit mode if ((Control.ModifierKeys & Keys.Control) == Keys.Control && ((Control.ModifierKeys & Keys.Alt) == 0)) return; IsInEditOrNavigateMode = false; // let the DataGrid know about the edit dataGrid.ColumnStartedEditing(Bounds); } ///[To be supplied.] ////// /// [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] protected internal override bool ProcessKeyMessage(ref Message m) { Keys key = (Keys)unchecked((int)(long)m.WParam); Keys modifierKeys = ModifierKeys; if ((key | modifierKeys) == Keys.Enter || (key | modifierKeys) == Keys.Escape || ((key | modifierKeys) == (Keys.Enter | Keys.Control)) ) { // enter and escape keys are sent directly to the DataGrid // for those keys, eat the WM_CHAR part of the KeyMessage // if (m.Msg == NativeMethods.WM_CHAR) return true; return ProcessKeyPreview(ref m); } if (m.Msg == NativeMethods.WM_CHAR) { if (key == Keys.LineFeed) // eat the LineFeed we get when the user presses Ctrl-Enter in a gridTextBox return true; return ProcessKeyEventArgs(ref m); } // now the edit control will be always on top of the grid // we only want to process the WM_KEYUP message ( the same way the grid was doing when the grid was getting all // the keys ) if (m.Msg == NativeMethods.WM_KEYUP) return true; Keys keyData = key & Keys.KeyCode; switch (keyData) { case Keys.Right: // here is the deal with Keys.Right: // if the end of the selection is at the end of the string // send this character to the dataGrid // else, process the KeyEvent // if (SelectionStart + SelectionLength == Text.Length) return ProcessKeyPreview(ref m); return ProcessKeyEventArgs(ref m); 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 dataGrid // else, process the KeyEvent // if (SelectionStart + SelectionLength == 0 || (this.IsInEditOrNavigateMode && this.SelectionLength == Text.Length)) return ProcessKeyPreview(ref m); return ProcessKeyEventArgs(ref m); case Keys.Down: // if the end of the selection is on the last line of the text then // send this character to the dataGrid // else, process the KeyEvent // int end = SelectionStart + SelectionLength; if (Text.IndexOf("\r\n", end) == -1) return ProcessKeyPreview(ref m); return ProcessKeyEventArgs(ref m); case Keys.Up: // if the end of the selection is on the first line of the text then // send this character to the dataGrid // else, process the KeyEvent // if ( Text.IndexOf("\r\n") < 0 || SelectionStart + SelectionLength < Text.IndexOf("\r\n")) return ProcessKeyPreview(ref m); return ProcessKeyEventArgs(ref m); case Keys.Home: case Keys.End: if (SelectionLength == Text.Length) return ProcessKeyPreview(ref m); else return ProcessKeyEventArgs(ref m); case Keys.Prior: case Keys.Next: case Keys.Oemplus: case Keys.Add: case Keys.OemMinus: case Keys.Subtract: if (IsInEditOrNavigateMode) { // this will ultimately call parent's ProcessKeyPreview // in our case, DataGrid's ProcessKeyPreview return ProcessKeyPreview(ref m); } else { return ProcessKeyEventArgs(ref m); } case Keys.Space: if (IsInEditOrNavigateMode && (Control.ModifierKeys & Keys.Shift) == Keys.Shift) { // when we get a SHIFT-SPACEBAR message, disregard the WM_CHAR part of the message if (m.Msg == NativeMethods.WM_CHAR) return true; // if the user pressed the SHIFT key at the same time with // the space key, send the key message to the DataGrid return ProcessKeyPreview(ref m); } return ProcessKeyEventArgs(ref m); case Keys.A: if (IsInEditOrNavigateMode && (Control.ModifierKeys & Keys.Control) == Keys.Control) { // when we get a Control-A message, disregard the WM_CHAR part of the message if (m.Msg == NativeMethods.WM_CHAR) return true; // if the user pressed the Control key at the same time with // the space key, send the key message to the DataGrid return ProcessKeyPreview(ref m); } return ProcessKeyEventArgs(ref m); case Keys.F2: IsInEditOrNavigateMode = false; // do not select all the text, but // position the caret at the end of the text SelectionStart = Text.Length; return true; case Keys.Delete: if (IsInEditOrNavigateMode) { // pass the delete to the parent, in our case, the DataGrid // if the dataGrid used the key, then we aren't gonne // use it anymore, else we are if (ProcessKeyPreview(ref m)) return true; else { // the edit control will use the // delete key: we are in Edit mode now: IsInEditOrNavigateMode = false; dataGrid.ColumnStartedEditing(Bounds); return ProcessKeyEventArgs(ref m); } } else return ProcessKeyEventArgs(ref m); case Keys.Tab: // the TextBox gets the Control-Tab messages, // not the parent if ((ModifierKeys & Keys.Control) == Keys.Control) return ProcessKeyPreview(ref m); else return ProcessKeyEventArgs(ref m); default: return ProcessKeyEventArgs(ref m); } } ///[To be supplied.] ////// /// public bool IsInEditOrNavigateMode { get { return isInEditOrNavigateMode; } set { isInEditOrNavigateMode = value; if (value) SelectAll(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.[To be supplied.] ///
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