Problem You need to make a snapshot of a composite (e.a. layout manager)
Solution Based on Jeroen's previous snapshot code of a widget, this one snaps the child widgets of a composite.
void makeSnapshot(const FXDrawable* drawable){ // Construct and create an FXImage object
FXPNGImage snapshot(getApp(), NULL, 0, drawable->getWidth(), drawable->getHeight());
snapshot.create();
// Create a window device context and lock it onto the image
FXDCWindow dc(&snapshot);
dc.clipChildren(FALSE);
dc.setFunction(BLT_SRC);
// Draw from the widget to this
dc.drawArea(drawable, 0, 0, drawable->getWidth(), drawable->getHeight(), 0, 0);
// Release lock
dc.end();
// Grab pixels from server side back to client side
snapshot.restore();
// Save recovered pixels to a file
FXFileStream stream;
if (stream.open("snapshot.png", FXStreamSave))
{
snapshot.savePixels(stream);
stream.close();
}
}
Contributor(s)Sander Jansen
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