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In this example, assume that the user drags the mouse pointer when he or she holds down the mouse button, so the mouseDown Boolean can be set to true. You also want to know the position of the mouse, which you can store in a Point, and the view port position of the mouse, which you can also store in a Point. Finally, you want the MultiScaleImage to trap all mouse commands, and you can do this by using the CaptureMouse method. When the mouse button is held down, typically users start dragging, and when they do so you want them to be able to pan around the image. Here s the code to achieve this:
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this.MouseMove += delegate(object sender, MouseEventArgs e) { lastMousePos = e.GetPosition(msi); if (duringDrag) { Point newPoint = lastMouseViewPort; newPoint.X += (lastMouseDownPos.X - lastMousePos.X) / msi.ActualWidth * msi.ViewportWidth; newPoint.Y += (lastMouseDownPos.Y - lastMousePos.Y) / msi.ActualWidth * msi.ViewportWidth; msi.ViewportOrigin = newPoint; } };
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The MouseMove event fires whether the mouse button is held down or not, so you use the duringDrag variable to indicate whether the user is dragging by holding down the mouse button. If the user is dragging the mouse pointer, the code in the if{ } statement executes. In this case, you find the new X,Y location of the mouse in the MultiScaleImage by getting the delta on each coordinate and dividing it by the product of the actual width of the MultiScaleImage by its viewport width to give its logical width. Remember that with the MultiScaleImage, you can zoom in and out, so the position in the viewport isn t always the same as the position on the screen containing it. This code calculates the position for you. Next, change the current upper left-hand corner of the viewport to the new mouse location. This gives the effect of dragging the image to view a new portion. Finally, when the user releases the mouse button, you have some house cleaning to do. First, you want to see whether the user was pressing the Shift key to get zooming out functionality in full screen mode when the mouse wheel button is not supported. In addition, you want to release the bool functions that are holding the mouse down and mouse dragging states.
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this.MouseLeftButtonUp += delegate(object sender, MouseButtonEventArgs e) { if (!duringDrag) { bool shiftDown = (Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift; double newzoom = zoom;
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if (shiftDown) { newzoom /= 2; } else { newzoom *= 2; } Zoom(newzoom, msi.ElementToLogicalPoint(this.lastMousePos)); } duringDrag = false; mouseDown = false; msi.ReleaseMouseCapture(); };
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By adding these three simple functions, you enable users to drag the image and pan the view of the image regardless of the zoom level. In the next section, you see how to use the mouse wheel button to zoom in and out of the image and thus reveal the images that are hidden when you are at the outer zoom levels.
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One problem with building Deep Zoom applications is that the de facto standard control for zooming in and out of an image is the mouse wheel button, but Silverlight and the .NET Framework don t handle events that use the mouse wheel button. You can solve this dilemma in two ways. The first is to use JavaScript rather than C# because the browser can capture rotation of the mouse wheel button and fire an event in response. The second option is to use the browser bridge to Silverlight so that the browser captures the event and then informs .NET that it has done so, after which the code to handle the event is implemented in .NET. Doing this is a lot easier than it sounds, and it is how code that is created by Deep Zoom Composer works. In the MouseWheelHelper.cs class, you can see the following code:
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HtmlPage.Window.AttachEvent("DOMMouseScroll", this.HandleMouseWheel); HtmlPage.Window.AttachEvent("onmousewheel", this.HandleMouseWheel); HtmlPage.Document.AttachEvent("onmousewheel", this.HandleMouseWheel);
This code uses the Silverlight browser bridge to attach JavaScript events to .NET events. (The browser bridge is discussed in more detail in 7, The Silverlight Browser Bridge. ) Whenever any of the specified JavaScript events occur, the HandleMouseWheel .NET event fires.
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