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Automatic discovery of new wallpaper #49

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26 changes: 26 additions & 0 deletions nDesk/DesktopPainter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,11 @@ DesktopPainter::DesktopPainter(HWND hWnd) : Window(hWnd, L"nDesk", g_pClickHandl

nCore::System::RegisterWindow(L"nDesk", this);
UpdateWallpaper(true);

//Create the notification for wallpaper change
hWallpaperEvent = CreateEvent(NULL, false, false, NULL);
RegOpenKeyEx(HKEY_CURRENT_USER, L"Control Panel\\Desktop", 0, KEY_NOTIFY, &hWallpaperKey);
RegNotifyChangeKeyValue(hWallpaperKey, FALSE, REG_NOTIFY_CHANGE_LAST_SET, hWallpaperEvent, TRUE);
}

/// <summary>
Expand All @@ -78,6 +83,12 @@ DesktopPainter::~DesktopPainter() {
if (m_TransitionEffect) {
delete m_TransitionEffect;
}

//Close the wallpaper event
CloseHandle(hWallpaperEvent);

//Close the wallpaper registry key
RegCloseKey(hWallpaperKey);
}

/// <summary>
Expand Down Expand Up @@ -328,13 +339,28 @@ void DesktopPainter::PaintComposite() {
/// Handles certain window messages.
/// </summary>
LRESULT DesktopPainter::HandleMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {

//Check if the wallpaper registry has been changed
if (WaitForSingleObject(hWallpaperEvent, 0) == WAIT_OBJECT_0)
{
//Fetch the new wallpaper
UpdateWallpaper();

//Force window to redraw
this->Repaint();

//RegNotifyChangeKeyValue() expires after the event has changed state
RegNotifyChangeKeyValue(hWallpaperKey, FALSE, REG_NOTIFY_CHANGE_LAST_SET, hWallpaperEvent, TRUE);
}

switch (uMsg) {
case WM_ERASEBKGND:
return 1;

case WM_PAINT:
{
if (!mDontRenderWallpaper) {

UpdateLock lock(this);

bool inAnimation = false;
Expand Down
4 changes: 4 additions & 0 deletions nDesk/DesktopPainter.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -118,4 +118,8 @@ class DesktopPainter : protected Window
// If on, every window will be repainted when the wallpaper is changed instead of just the
// desktop background. Fixes issues with other modules (xModules).
bool m_bInvalidateAllOnUpdate;

//Event to check if Desktop Wallpaper has been changed
HANDLE hWallpaperEvent;
HKEY hWallpaperKey;
};