我把 3TextBoxes
放在里面,DataGridView.
我可以集中它们并输入文本。但是当我尝试使用箭头在 TexBox 内移动光标时,DataGridView 会窃取箭头键,并在网格中移动单元格选择。如何预防?
问问题
262 次
1 回答
1
在尝试了一些覆盖默认键行为的艰难尝试后DataGridView
,我最终得到了这个变通办法、棘手和 hacky 的解决方案。就像您控制TextBox
. 抑制Key message
onDataGridView
很容易,但不知何故,子控件不能受这些关键消息的影响,尽管它可以接收这些消息。那很奇怪。我真的很想知道这个问题最漂亮和最直接的解决方案,如果有人知道,请添加您的答案或留下一些参考链接作为您的评论。那将不胜感激。正如我所说,这是我拥有的代码,它既棘手又笨拙,但效果很好:
//This helper class to use some Win32 functions, must add using System.Runtime.InteropServices;
public class Win32 {
[DllImport("user32")]
public static extern bool GetCaretPos(out POINT pos);
[DllImport("user32")]
public static extern bool SetCaretPos(int x, int y);
[DllImport("user32")]
public static extern int SendMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam);
public struct POINT {
public int x, y;
}
}
//This is the extension class for TextBox, it's just for convenience
public static class TextBoxExtension {
public static void BeginUpdate(this TextBox text) {
Win32.SendMessage(text.Handle, 0xb, IntPtr.Zero, IntPtr.Zero);
}
public static void EndUpdate(this TextBox text) {
Win32.SendMessage(text.Handle, 0xb, new IntPtr(1), IntPtr.Zero);
}
public static int GetCaretCharIndex(this TextBox text){
Win32.POINT p;
Win32.GetCaretPos(out p);
return text.GetCharIndexFromPosition(new Point(p.x, p.y));
}
public static void SetCaretCharIndex(this TextBox text, int charIndex) {
Point p = text.GetPositionFromCharIndex(charIndex);
Win32.SetCaretPos(p.X, p.Y);
}
public static void ProcessRight(this TextBox text, bool shiftPressed) {
if (shiftPressed) {
int lastEndIndex = text.SelectionStart + text.SelectionLength;
int caretCharIndex = text.GetCaretCharIndex();
if (caretCharIndex == lastEndIndex || (caretCharIndex == text.TextLength-1 && text.SelectionLength > 1)){
text.SelectionLength++;
} else {
text.BeginUpdate();
text.SelectionStart++;
if (lastEndIndex < text.TextLength) text.SelectionLength--;
text.EndUpdate();
text.Refresh();
if (text.SelectionStart < text.TextLength) text.SetCaretCharIndex(text.SelectionStart);
}
} else {
if (text.SelectionLength > 0) {
int s = text.SelectionLength;
text.SelectionLength = 0;
text.SelectionStart += s;
}
else if (text.SelectionStart < text.TextLength) text.SelectionStart++;
}
}
public static void ProcessLeft(this TextBox text, bool shiftPressed) {
if (shiftPressed) {
if (text.GetCaretCharIndex() == text.SelectionStart || text.SelectionStart == text.TextLength) {
if (text.SelectionStart > 0) {
text.BeginUpdate();
text.SelectionStart--;
text.SelectionLength++;
text.EndUpdate();
text.Refresh();
text.SetCaretCharIndex(text.SelectionStart);
}
} else {
text.SelectionLength--;
}
} else {
if (text.SelectionStart > 0 && text.SelectionLength == 0) text.SelectionStart--;
text.SelectionLength = 0;
}
}
public static void ProcessHome(this TextBox text, bool shiftPressed) {
if (shiftPressed) {
int i = text.SelectionStart;
text.SelectionStart = 0;
text.SelectionLength = i;
text.SetCaretCharIndex(0);
} else {
text.SelectionLength = 0;
text.SelectionStart = 0;
}
}
public static void ProcessEnd(this TextBox text, bool shiftPressed) {
if (shiftPressed) {
text.SelectionLength = text.TextLength - text.SelectionStart;
} else {
text.SelectionLength = 0;
text.SelectionStart = text.TextLength;
}
}
public static void ProcessDelete(this TextBox text) {
if (text.SelectionLength == 0) text.SelectionLength = 1;
text.SelectedText = "";
}
}
//your custom DataGridView
public class CustomDGV : DataGridView {
public event EventHandler InnerTextBoxEnterKeyPress;
protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
TextBox childControl = Controls.OfType<TextBox>().FirstOrDefault(c=>c.Focused);
if (childControl != null) {
bool suppress = true;
switch (keyData) {
case Keys.Right:
childControl.ProcessRight(false);
break;
case Keys.Shift | Keys.Right:
childControl.ProcessRight(true);
break;
case Keys.Left:
childControl.ProcessLeft(false);
break;
case Keys.Shift | Keys.Left:
childControl.ProcessLeft(true);
break;
case Keys.End:
childControl.ProcessEnd(false);
break;
case Keys.Home:
childControl.ProcessHome(false);
break;
case Keys.Delete:
childControl.ProcessDelete();
break;
case Keys.Shift | Keys.End:
childControl.ProcessEnd(true);
break;
case Keys.Shift | Keys.Home:
childControl.ProcessHome(true);
break;
case Keys.Control | Keys.C:
childControl.Copy();
break;
case Keys.Control | Keys.X:
childControl.Cut();
break;
case Keys.Control | Keys.V:
childControl.Paste();
break;
case Keys.Enter:
EventHandler handler = InnerTextBoxEnterKeyPress;
if (handler != null) InnerTextBoxEnterKeyPress(childControl, EventArgs.Empty);
Focus();
break;
default:
suppress = false;
break;
}
if (suppress) return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
}
注意:我还添加了一个名为 的事件,您可以注册此事件以在用户在网格InnerTextBoxEnterKeyPress
内部按 Enter 时执行您自己的行为,如下所示:TextBox
customDGV1.InnerTextBoxEnterKeyPress += (s,e) => {
TextBox text = s as TextBox;
//your code goes here ... try showing some message to see it in action
MessageBox.Show(text.Text);
};
于 2013-10-26T01:50:05.070 回答