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POC# DataGridView (CheckBox) Cell Click Multiple Callbacks
 

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    <p>[C#, Visual Studio 2008, Windows 7 64]</p> <p>I have a <em>DataGridView</em> in my class. This data grid view uses <em>DataGridViewCheckBoxColumn</em> so that each cell contains a checkbox. </p> <p>Here is a screenshot of one of the rows:</p> <p><img src="https://i144.photobucket.com/albums/r177/tackyjan/datagridview_checkbox.png" alt="DataGridView Checkboxes"></p> <p>I want to be able to detect if the user selects the cell (somewhere in the cell but not on top of the checkbox). I also want to detect i the user selects the checkbox. In order to do this my code must set callbacks for both events:</p> <pre><code>this.CellClick += cellClick; // callback when the user selects a cell this.CellContentClick += cellContentClick; // callback when the user selects a checkbox </code></pre> <p>Here are the callback methods:</p> <pre><code> private void cellContentClick(object sender, DataGridViewCellEventArgs e) { toggleCellCheck(e.RowIndex, e.ColumnIndex); } private void cellClick(object sender, DataGridViewCellEventArgs e) { toggleCellCheck(e.RowIndex, e.ColumnIndex); } private void toggleCellCheck(int row, int column) { bool isChecked = (bool)this[column, row].EditedFormattedValue; this.Rows[row].Cells[column].Value = !isChecked; } </code></pre> <p>(<em>NOTE:</em> As you can see the <em>toggleCellCheck</em> method gets the checkbox value and toggles it, checked->unchecked or unchecked->checked.)</p> <p>When the user clicks anywhere in a cell that is not the checkbox only one callback is fired, <em>cellClick</em>. The <em>toggleCellCheck</em> method is subsequently called and the checkbox state flips.</p> <p>This is the exact behavior I want.</p> <p>The problem I am having is, when the user clicks directly on a checkbox <strong>both</strong> events get fired in the following order: <em>cellClick</em> then <em>cellContentClick</em>.</p> <p>Both callbacks being executed results in the checkbox <em>checked</em> state being toggled after the first callback and then toggled again after the second callback. The net result of course is the checkbox <em>checked</em> status does not change.</p> <p>Is there some way I can configure the <em>DataGridView</em> class to stop both callbacks from being fired? Or, is there a way I can detect (inside the <em>cellContentClick</em> method) that this is the <em>second</em> callback, or the callback was generated by clicking a checkbox, and then just exit without calling <em>toggleCellCheck</em>?</p> <p>I was thinking something like the following:</p> <pre><code>private void cellContentClick(object sender, DataGridViewCellEventArgs e) { // if sender/sender child/etc. is of type checkbox then return because // _cellClick_ has already been called to change the checkbox checked property // something like the following: // // if (typeof(sender) == CheckBox) return; // else toggleCellCheck(e.RowIndex, e.ColumnIndex); } </code></pre> <p>Thanks!</p> <p>Jan</p>
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    1. COUpdate... I found a way to circumvent this behavior. It's a major hack but it works... I uses a boolean vaiable which gets set to true inside the _cellClicked_ method. Then, inside the _cellContentClick_ method I check this boolean value. If it's true (the checkbox has already changed) then I exit the method. Otherwise I toggle the checkbox state. This is not an elegant solution but at least it's one that works. (I am still open to suggestions on a better way to do this!)
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    2. COYou should not need the cell content click handler - cell click is called when the checkbox is selected.
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      1. USDavid Hall
 

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