136 lines
4.3 KiB
C++
136 lines
4.3 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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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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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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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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//==============================================================================
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class HiddenMessageWindow
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{
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public:
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HiddenMessageWindow (const TCHAR* const messageWindowName, WNDPROC wndProc)
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{
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String className ("JUCE_");
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className << String::toHexString (Time::getHighResolutionTicks());
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HMODULE moduleHandle = (HMODULE) Process::getCurrentModuleInstanceHandle();
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WNDCLASSEX wc = { 0 };
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wc.cbSize = sizeof (wc);
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wc.lpfnWndProc = wndProc;
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wc.cbWndExtra = 4;
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wc.hInstance = moduleHandle;
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wc.lpszClassName = className.toWideCharPointer();
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atom = RegisterClassEx (&wc);
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jassert (atom != 0);
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hwnd = CreateWindow (getClassNameFromAtom(), messageWindowName,
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0, 0, 0, 0, 0, 0, 0, moduleHandle, 0);
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jassert (hwnd != 0);
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}
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~HiddenMessageWindow()
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{
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DestroyWindow (hwnd);
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UnregisterClass (getClassNameFromAtom(), 0);
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}
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inline HWND getHWND() const noexcept { return hwnd; }
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private:
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ATOM atom;
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HWND hwnd;
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LPCTSTR getClassNameFromAtom() noexcept { return (LPCTSTR) (pointer_sized_uint) atom; }
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};
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//==============================================================================
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class JuceWindowIdentifier
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{
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public:
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static bool isJUCEWindow (HWND hwnd) noexcept
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{
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return GetWindowLongPtr (hwnd, GWLP_USERDATA) == getImprobableWindowNumber();
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}
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static void setAsJUCEWindow (HWND hwnd, bool isJuceWindow) noexcept
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{
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SetWindowLongPtr (hwnd, GWLP_USERDATA, isJuceWindow ? getImprobableWindowNumber() : 0);
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}
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private:
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static LONG_PTR getImprobableWindowNumber() noexcept
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{
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static auto number = (LONG_PTR) Random().nextInt64();
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return number;
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}
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};
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//==============================================================================
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class DeviceChangeDetector : private Timer
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{
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public:
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DeviceChangeDetector (const wchar_t* const name)
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: messageWindow (name, (WNDPROC) deviceChangeEventCallback)
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{
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SetWindowLongPtr (messageWindow.getHWND(), GWLP_USERDATA, (LONG_PTR) this);
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}
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virtual ~DeviceChangeDetector() {}
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virtual void systemDeviceChanged() = 0;
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void triggerAsyncDeviceChangeCallback()
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{
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// We'll pause before sending a message, because on device removal, the OS hasn't always updated
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// its device lists correctly at this point. This also helps avoid repeated callbacks.
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startTimer (500);
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}
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private:
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HiddenMessageWindow messageWindow;
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static LRESULT CALLBACK deviceChangeEventCallback (HWND h, const UINT message,
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const WPARAM wParam, const LPARAM lParam)
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{
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if (message == WM_DEVICECHANGE
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&& (wParam == 0x8000 /*DBT_DEVICEARRIVAL*/
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|| wParam == 0x8004 /*DBT_DEVICEREMOVECOMPLETE*/
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|| wParam == 0x0007 /*DBT_DEVNODES_CHANGED*/))
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{
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((DeviceChangeDetector*) GetWindowLongPtr (h, GWLP_USERDATA))
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->triggerAsyncDeviceChangeCallback();
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}
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return DefWindowProc (h, message, wParam, lParam);
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}
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void timerCallback() override
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{
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stopTimer();
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systemDeviceChanged();
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}
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};
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} // namespace juce
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