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138 lines
4.5 KiB
138 lines
4.5 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2013 - Raw Material Software 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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#ifndef JUCE_WIN32_HIDDENMESSAGEWINDOW_H_INCLUDED
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#define JUCE_WIN32_HIDDENMESSAGEWINDOW_H_INCLUDED
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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) MAKELONG (atom, 0); }
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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 LONG_PTR number = (LONG_PTR) Random::getSystemRandom().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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protected:
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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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#endif // JUCE_WIN32_HIDDENMESSAGEWINDOW_H_INCLUDED
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