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135 lines
4.4 KiB
135 lines
4.4 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI 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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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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struct ScreenPositionComparator
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{
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static int compareElements (const Component* const first, const Component* const second)
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{
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const int explicitOrder1 = getOrder (first);
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const int explicitOrder2 = getOrder (second);
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if (explicitOrder1 != explicitOrder2)
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return explicitOrder1 - explicitOrder2;
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const int yDiff = first->getY() - second->getY();
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return yDiff == 0 ? first->getX() - second->getX()
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: yDiff;
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}
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static int getOrder (const Component* const c)
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{
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const int order = c->getExplicitFocusOrder();
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return order > 0 ? order : (std::numeric_limits<int>::max() / 2);
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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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for (int 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 (int 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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static Component* findFocusContainer (Component* c)
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{
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c = c->getParentComponent();
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if (c != nullptr)
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while (c->getParentComponent() != nullptr && ! c->isFocusContainer())
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c = c->getParentComponent();
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return c;
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}
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static Component* getIncrementedComponent (Component* const current, const int delta)
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{
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Component* focusContainer = findFocusContainer (current);
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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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return nullptr;
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}
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}
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//==============================================================================
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KeyboardFocusTraverser::KeyboardFocusTraverser() {}
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KeyboardFocusTraverser::~KeyboardFocusTraverser() {}
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Component* KeyboardFocusTraverser::getNextComponent (Component* current)
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{
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jassert (current != nullptr);
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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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jassert (current != nullptr);
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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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