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130 lines
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HTML
130 lines
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HTML
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<h1 id="keyboard-event-processing">Keyboard Event Processing</h1>
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<p>Keyboard events are sent by the <a href="mainloop.html">Main Loop</a> to the
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Application class for processing. The keyboard events are sent
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exclusively to the current <code>Toplevel</code>, this being either the default
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that is created when you call <code>Application.Init</code>, or one that you
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created an passed to <code>Application.Run(Toplevel)</code>. </p>
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<h2 id="flow">Flow</h2>
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<p>Keystrokes are first processes as hotkeys, then as regular keys, and
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there is a final cold post-processing event that is invoked if no view
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processed the key.</p>
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<h2 id="hotkey-processing">HotKey Processing</h2>
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<p>Events are first send to all views as a "HotKey", this means that the
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<code>View.ProcessHotKey</code> method is invoked on the current toplevel, which
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in turns propagates this to all the views in the hierarchy. If any
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view decides to process the event, no further processing takes place.</p>
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<p>This is how hotkeys for buttons are implemented. For example, the
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keystroke "Alt-A" is handled by Buttons that have a hot-letter "A" to
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activate the button.</p>
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<h2 id="regular-processing">Regular Processing</h2>
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<p>Unlike the hotkey processing, the regular processing is only sent to
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the currently focused view in the focus chain.</p>
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<p>The regular key processing is only invoked if no hotkey was caught.</p>
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<h2 id="cold-key-processing">Cold-key Processing</h2>
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<p>This stage only is executed if the focused view did not process the
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event, and is broadcast to all the views in the Toplevel.</p>
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<p>This method can be overwritten by views that want to provide
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accelerator functionality (Alt-key for example), but without
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interefering with normal ProcessKey behavior.</p>
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