mirror of
https://github.com/juce-framework/JUCE.git
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146 lines
4.8 KiB
C++
146 lines
4.8 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-11 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online 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.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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BEGIN_JUCE_NAMESPACE
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//==============================================================================
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KeyboardFocusTraverser::KeyboardFocusTraverser()
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{
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}
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KeyboardFocusTraverser::~KeyboardFocusTraverser()
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{
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}
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//==============================================================================
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namespace KeyboardFocusHelpers
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{
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// This will sort a set of components, so that they are ordered in terms of
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// left-to-right and then top-to-bottom.
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class ScreenPositionComparator
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{
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public:
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ScreenPositionComparator() {}
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static int compareElements (const Component* const first, const Component* const second)
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{
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int explicitOrder1 = first->getExplicitFocusOrder();
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if (explicitOrder1 <= 0)
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explicitOrder1 = std::numeric_limits<int>::max() / 2;
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int explicitOrder2 = second->getExplicitFocusOrder();
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if (explicitOrder2 <= 0)
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explicitOrder2 = std::numeric_limits<int>::max() / 2;
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if (explicitOrder1 != explicitOrder2)
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return explicitOrder1 - explicitOrder2;
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const int diff = first->getY() - second->getY();
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return (diff == 0) ? first->getX() - second->getX()
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: diff;
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}
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};
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static void findAllFocusableComponents (Component* const parent, Array <Component*>& comps)
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{
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if (parent->getNumChildComponents() > 0)
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{
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Array <Component*> localComps;
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ScreenPositionComparator comparator;
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int i;
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for (i = parent->getNumChildComponents(); --i >= 0;)
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{
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Component* const c = parent->getChildComponent (i);
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if (c->isVisible() && c->isEnabled())
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localComps.addSorted (comparator, c);
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}
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for (i = 0; i < localComps.size(); ++i)
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{
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Component* const c = localComps.getUnchecked (i);
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if (c->getWantsKeyboardFocus())
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comps.add (c);
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if (! c->isFocusContainer())
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findAllFocusableComponents (c, comps);
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}
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}
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}
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}
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namespace KeyboardFocusHelpers
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{
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Component* getIncrementedComponent (Component* const current, const int delta)
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{
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Component* focusContainer = current->getParentComponent();
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if (focusContainer != nullptr)
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{
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while (focusContainer->getParentComponent() != nullptr && ! focusContainer->isFocusContainer())
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focusContainer = focusContainer->getParentComponent();
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if (focusContainer != nullptr)
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{
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Array <Component*> comps;
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KeyboardFocusHelpers::findAllFocusableComponents (focusContainer, comps);
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if (comps.size() > 0)
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{
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const int index = comps.indexOf (current);
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return comps [(index + comps.size() + delta) % comps.size()];
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}
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}
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}
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return nullptr;
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}
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}
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Component* KeyboardFocusTraverser::getNextComponent (Component* current)
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{
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return KeyboardFocusHelpers::getIncrementedComponent (current, 1);
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}
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Component* KeyboardFocusTraverser::getPreviousComponent (Component* current)
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{
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return KeyboardFocusHelpers::getIncrementedComponent (current, -1);
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}
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Component* KeyboardFocusTraverser::getDefaultComponent (Component* parentComponent)
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{
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Array <Component*> comps;
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if (parentComponent != nullptr)
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KeyboardFocusHelpers::findAllFocusableComponents (parentComponent, comps);
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return comps.getFirst();
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}
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END_JUCE_NAMESPACE
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