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https://github.com/juce-framework/JUCE.git
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126 lines
4.5 KiB
C++
126 lines
4.5 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce::detail
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{
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struct FocusHelpers
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{
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FocusHelpers() = delete;
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static int getOrder (const Component* c)
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{
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auto order = c->getExplicitFocusOrder();
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return order > 0 ? order : std::numeric_limits<int>::max();
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}
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template <typename FocusContainerFn>
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static void findAllComponents (const Component* parent,
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std::vector<Component*>& components,
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FocusContainerFn isFocusContainer)
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{
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if (parent == nullptr || parent->getNumChildComponents() == 0)
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return;
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std::vector<Component*> localComponents;
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for (auto* c : parent->getChildren())
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if (c->isVisible() && c->isEnabled())
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localComponents.push_back (c);
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const auto compareComponents = [&] (const Component* a, const Component* b)
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{
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const auto getComponentOrderAttributes = [] (const Component* c)
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{
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return std::make_tuple (getOrder (c),
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c->isAlwaysOnTop() ? 0 : 1,
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c->getY(),
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c->getX());
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};
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return getComponentOrderAttributes (a) < getComponentOrderAttributes (b);
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};
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// This will sort so that they are ordered in terms of explicit focus,
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// always on top, left-to-right, and then top-to-bottom.
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std::stable_sort (localComponents.begin(), localComponents.end(), compareComponents);
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for (auto* c : localComponents)
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{
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components.push_back (c);
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if (! (c->*isFocusContainer)())
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findAllComponents (c, components, isFocusContainer);
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}
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}
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enum class NavigationDirection { forwards, backwards };
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template <typename FocusContainerFn>
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static Component* navigateFocus (const Component* current,
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const Component* focusContainer,
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NavigationDirection direction,
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FocusContainerFn isFocusContainer)
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{
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if (focusContainer == nullptr)
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return nullptr;
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std::vector<Component*> components;
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findAllComponents (focusContainer, components, isFocusContainer);
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const auto iter = std::find (components.cbegin(), components.cend(), current);
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if (iter == components.cend())
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return nullptr;
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switch (direction)
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{
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case NavigationDirection::forwards:
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if (iter != std::prev (components.cend()))
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return *std::next (iter);
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break;
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case NavigationDirection::backwards:
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if (iter != components.cbegin())
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return *std::prev (iter);
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break;
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}
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return nullptr;
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}
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};
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} // namespace juce::detail
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