[英]How do I determine the cell being clicked on in a TableLayoutPanel?
I have a TableLayoutPanel
and I want to add a control to the cell that I click on. 我有一个
TableLayoutPanel
,我想在我点击的单元格中添加一个控件。
The problem is that I can't determine the cell that I click on at run time. 问题是我无法确定在运行时单击的单元格。
How do I determine the cell being clicked on? 如何确定单击的单元格?
You can use GetColumnWidths
and GetRowHeights
methods to calculate the cell row and column index: 您可以使用
GetColumnWidths
和GetRowHeights
方法来计算单元格行和列索引:
Point? GetRowColIndex(TableLayoutPanel tlp, Point point)
{
if (point.X > tlp.Width || point.Y > tlp.Height)
return null;
int w = tlp.Width;
int h = tlp.Height;
int[] widths = tlp.GetColumnWidths();
int i;
for (i = widths.Length - 1; i >= 0 && point.X < w; i--)
w -= widths[i];
int col = i + 1;
int[] heights = tlp.GetRowHeights();
for (i = heights.Length - 1; i >= 0 && point.Y < h; i--)
h -= heights[i];
int row = i + 1;
return new Point(col, row);
}
Usage: 用法:
private void tableLayoutPanel1_Click(object sender, EventArgs e)
{
var cellPos = GetRowColIndex(
tableLayoutPanel1,
tableLayoutPanel1.PointToClient(Cursor.Position));
}
But notice that the click event only is raised if the cell does not already contain a control. 但请注意,如果单元格尚未包含控件,则仅引发click事件。
This worked for me: 这对我有用:
public TableLayoutPanel tableLayoutPanel { get; set; }
private void Form_Load(object sender, EventArgs e)
{
foreach (Panel space in this.tableLayoutPanel.Controls)
{
space.MouseClick += new MouseEventHandler(clickOnSpace);
}
}
public void clickOnSpace(object sender, MouseEventArgs e)
{
MessageBox.Show("Cell chosen: (" +
tableLayoutPanel.GetRow((Panel)sender) + ", " +
tableLayoutPanel.GetColumn((Panel)sender) + ")");
}
Note that my tableLayoutPanel is declared globally so that I can just use it without having to pass it to each function. 请注意,我的tableLayoutPanel是全局声明的,因此我可以使用它而不必将其传递给每个函数。 Also, both the tableLayoutPanel and each Panel within it are created completely programatically elsewhere (my form [design] is completely blank).
另外,tableLayoutPanel和其中的每个Panel都是以编程方式在其他地方创建的(我的表单[design]完全是空白的)。
My answer is based on @Mohammad Dehghan 's answer above but has a couple of advantages: 我的回答是基于@Mohammad Dehghan的回答,但有几个优点:
i=0
instead of i=length
), meaning columns of different widths or heights are processed in the correct order i=0
开始而不是i=length
),这意味着以正确的顺序处理不同宽度或高度的列 Here is the updated version of the code: 这是代码的更新版本:
public Point? GetIndex(TableLayoutPanel tlp, Point point)
{
// Method adapted from: stackoverflow.com/a/15449969
if (point.X > tlp.Width || point.Y > tlp.Height)
return null;
int w = 0, h = 0;
int[] widths = tlp.GetColumnWidths(), heights = tlp.GetRowHeights();
int i;
for (i = 0; i < widths.Length && point.X > w; i++)
{
w += widths[i];
}
int col = i - 1;
for (i = 0; i < heights.Length && point.Y + tlp.VerticalScroll.Value > h; i++)
{
h += heights[i];
}
int row = i - 1;
return new Point(col, row);
}
Nick's answer was the best solution, except that it can be made generic for TableLayoutPanels that contain different kinds of controls in the cells. 尼克的回答是最好的解决方案,除了它可以为包含不同类型的控件的TableLayoutPanel制作通用的。 Just change the explicit "Panel" type to "Control":
只需将显式“面板”类型更改为“控制”:
public TableLayoutPanel tableLayoutPanel { get; set; }
private void Form_Load(object sender, EventArgs e)
{
foreach (Control c in this.tableLayoutPanel.Controls)
{
c.MouseClick += new MouseEventHandler(ClickOnTableLayoutPanel);
}
}
public void ClickOnTableLayoutPanel(object sender, MouseEventArgs e)
{
MessageBox.Show("Cell chosen: (" +
tableLayoutPanel.GetRow((Control)sender) + ", " +
tableLayoutPanel.GetColumn((Control)sender) + ")");
}
This works great and doesn't require doing coordinate math to find which cell was clicked. 这很有效,不需要进行坐标数学来查找单击了哪个单元格。
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