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90 lines
3.3 KiB
90 lines
3.3 KiB
11 years ago
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_KEYBOARDFOCUSTRAVERSER_H_INCLUDED
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#define JUCE_KEYBOARDFOCUSTRAVERSER_H_INCLUDED
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//==============================================================================
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/**
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Controls the order in which focus moves between components.
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The default algorithm used by this class to work out the order of traversal
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is as follows:
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- if two components both have an explicit focus order specified, then the
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one with the lowest number comes first (see the Component::setExplicitFocusOrder()
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method).
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- any component with an explicit focus order greater than 0 comes before ones
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that don't have an order specified.
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- any unspecified components are traversed in a left-to-right, then top-to-bottom
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order.
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If you need traversal in a more customised way, you can create a subclass
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of KeyboardFocusTraverser that uses your own algorithm, and use
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Component::createFocusTraverser() to create it.
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@see Component::setExplicitFocusOrder, Component::createFocusTraverser
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*/
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class JUCE_API KeyboardFocusTraverser
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{
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public:
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KeyboardFocusTraverser();
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/** Destructor. */
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virtual ~KeyboardFocusTraverser();
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/** Returns the component that should be given focus after the specified one
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when moving "forwards".
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The default implementation will return the next component which is to the
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right of or below this one.
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This may return 0 if there's no suitable candidate.
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*/
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virtual Component* getNextComponent (Component* current);
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/** Returns the component that should be given focus after the specified one
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when moving "backwards".
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The default implementation will return the next component which is to the
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left of or above this one.
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This may return 0 if there's no suitable candidate.
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*/
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virtual Component* getPreviousComponent (Component* current);
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/** Returns the component that should receive focus be default within the given
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parent component.
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The default implementation will just return the foremost child component that
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wants focus.
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This may return 0 if there's no suitable candidate.
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*/
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virtual Component* getDefaultComponent (Component* parentComponent);
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};
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#endif // JUCE_KEYBOARDFOCUSTRAVERSER_H_INCLUDED
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