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The previous example does not actually display characters typed unless the Silverlight plug-in has focus and this particular user control has focus For example, clicking on the user control gives it focus and enables it to receive keyboard events A control can explicitly take focus by calling the ControlFocus() method similar to how focus is transferred between HTML DOM elements The ControlFocus() call changes the element that Silverlight considers to have focus; however, if the Silverlight plug-in does not have focus, the plug-in still does not have focus after this call You need to call the Focus() method on the Silverlight plug-in to set the focus of the plug-in to the current window You should also use the IsTabStop property to specify which elements can receive focus through a tab operation and the TabIndex property to specify the order:
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<UserControl x:Class="KeyboardEventsPage" xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation" xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" > <StackPanel> <TextBox IsTabStop="False" Text="Not in tab order" /> <TextBox IsTabStop="True" TabIndex="2" Text="Second" /> <TextBox IsTabStop="True" TabIndex="1" Text="First" /> </StackPanel> </UserControl>
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If no value is set for the TabIndex property, the next element to receive focus when the tab key is pressed is the next element with IsTabStop="True" in element tree walk order
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To ensure that your application is accessible to individuals with disabilities every component in your user interface should be usable using only the keyboard The mouse should never be the only method for using some feature of your application In particular, someone who is blind will not be able to use a mouse, but can use a keyboard interface with a screen reader
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This section discusses how the Silverlight input system delegates input and fires events under the hood
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Mouse Events When the Web browser provides the Silverlight plug-in with a mouse event, Silverlight does the following:
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1 Checks if mouse capture is set on some element If mouse capture is set, the captured element rst receives that event 2 If mouse capture is not set, performs a hit-test operation to nd the element under the current mouse position 3 Records the path from the element found in steps 1 2 up the parent chain to the root element in a list that determines the bubbling order for events 4 Enumerates the bubbling list and res the mouse events 5 If an event handler marks the event as handled, stops enumerating the bubbling order list and stops ring further events for this mouse event Silverlight records the bubbling order in a list so that any element child and parent changes during event handlers do not affect which events Silverlight fires
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Silverlight may walk many of the elements in your tree during a hit-test operation As with a number of systems in Silverlight, keeping application trees as simple as possible is a general performance improvement You can reduce the element count by removing elements that are no longer visible
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Keyboard Events When the Web browser provides the Silverlight plug-in with a keyboard event, Silverlight does the following:
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1 Sends the event to the element with focus 2 If the element does not handle the event, Silverlight checks if it is a special key For example, if the tab key is pressed and the control does not handle tab, Silverlight changes focus to the next element that can receive focus Silverlight only provides you with KeyDown and KeyUp events Some other platform libraries have additional character events that represent an accumulation of several key strokes For example, typing a Japanese character may involve many KeyDown and KeyUp events for a single character For multi-language input, Silverlight provides a TextBox element to map several keys to a single key
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Asynchronously Firing Events Silverlight fires some mouse and keyboard events asynchronously to your application Silverlight fires input events after layout events or per-frame callback events but before Silverlight renders content to the screen If there are other asynchronous events (such as a download complete event), those are mixed with your input events Generally, you can rely on the relative order of input events being the same as the order the user provided the input, but the order relative to other types of events may not be predictable
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