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POHow to manually trigger MouseMove event for a stationary mouse
 

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  1. POHow to manually trigger MouseMove event for a stationary mouse
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    <p>I'm implementing a 'value under cursor' readout for chart contents. Currently I am achieving this using ReactiveExtensions and subscribing to the GetMouseMove event on my chart background Grid:</p> <pre><code>private void SetupMouseover( Grid plotArea) { var mouseMove = from mo in plotArea.GetMouseMove() select new { CurrentPos = mo.EventArgs.GetPosition( plotArea ) }; mouseMove.Subscribe( item =&gt; { // Update the readout contents readoutTextBlock.Text = PositionToReadoutValue(item.CurrentPos); } ); } </code></pre> <p>And that works fine. I can move my mouse around and I get my text block updated.</p> <p>The problem is that the chart contents are being updated dynamically (moving across the screen). If I leave the mouse cursor stationary over the point, the contents beneath it change but (obviously) the readout is not updated.</p> <p>I attempted to manually trigger the mouse move by setting the cursor position to itself whenever the data in the model was updated:</p> <pre><code>private void MoveCursor() { // move the mouse cursor 0 pixels System.Windows.Forms.Cursor.Position = new System.Drawing.Point(System.Windows.Forms.Cursor.Position.X, System.Windows.Forms.Cursor.Position.Y); } </code></pre> <p>This did not trigger the callback. Setting the position to be (X-1, Y-1) DID trigger the callback, but if I immediately set the pixel back to the original location (a subsequent X+1,Y+1) this does NOT trigger the mousemove callback for either Position set.</p> <p>I also tried manually setting the readoutTextBlock on notification of my model changed based on Mouse.GetPosition(m_PlotArea) but encountered threading issues (model is update in separate thread) and also hit-test issues with m_PlotArea.</p> <p>Any suggestions?</p>
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