mirror of
https://github.com/juce-framework/JUCE.git
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118 lines
3.9 KiB
C++
118 lines
3.9 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2022 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 7 End-User License
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Agreement and JUCE Privacy Policy.
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End User License Agreement: www.juce.com/juce-7-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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extern XContext windowHandleXContext;
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/* Attaches a pointer to a given window, so that it can be retrieved with XFindContext on
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the windowHandleXContext.
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*/
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class ScopedWindowAssociation
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{
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public:
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ScopedWindowAssociation() = default;
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ScopedWindowAssociation (void* associatedIn, Window windowIn)
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: associatedPointer ([&]() -> void*
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{
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if (associatedIn == nullptr)
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return nullptr;
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// If you hit this, there's already a pointer associated with this window.
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const auto display = XWindowSystem::getInstance()->getDisplay();
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jassert (! getAssociatedPointer (display, windowIn).has_value());
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if (X11Symbols::getInstance()->xSaveContext (display,
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static_cast<XID> (windowIn),
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windowHandleXContext,
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unalignedPointerCast<XPointer> (associatedIn)) != 0)
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{
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jassertfalse;
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return nullptr;
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}
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return associatedIn;
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}()),
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window (static_cast<XID> (windowIn)) {}
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ScopedWindowAssociation (const ScopedWindowAssociation&) = delete;
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ScopedWindowAssociation& operator= (const ScopedWindowAssociation&) = delete;
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ScopedWindowAssociation (ScopedWindowAssociation&& other) noexcept
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: associatedPointer (std::exchange (other.associatedPointer, nullptr)), window (other.window) {}
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ScopedWindowAssociation& operator= (ScopedWindowAssociation&& other) noexcept
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{
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ScopedWindowAssociation { std::move (other) }.swap (*this);
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return *this;
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}
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~ScopedWindowAssociation() noexcept
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{
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if (associatedPointer == nullptr)
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return;
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const auto display = XWindowSystem::getInstance()->getDisplay();
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const auto ptr = getAssociatedPointer (display, window);
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if (! ptr.has_value())
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{
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// If you hit this, something else has cleared this association before we were able to.
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jassertfalse;
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return;
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}
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jassert (unalignedPointerCast<XPointer> (associatedPointer) == *ptr);
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if (X11Symbols::getInstance()->xDeleteContext (display, window, windowHandleXContext) != 0)
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jassertfalse;
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}
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bool isValid() const { return associatedPointer != nullptr; }
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private:
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static std::optional<XPointer> getAssociatedPointer (Display* display, Window window)
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{
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XPointer ptr{};
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if (X11Symbols::getInstance()->xFindContext (display, window, windowHandleXContext, &ptr) != 0)
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return std::nullopt;
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return ptr;
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}
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void swap (ScopedWindowAssociation& other) noexcept
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{
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std::swap (other.associatedPointer, associatedPointer);
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std::swap (other.window, window);
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}
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void* associatedPointer = nullptr;
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XID window{};
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};
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} // namespace juce
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