On Wed, Jul 16, 2014 at 4:32 PM, Jean-Marc Lasgouttes <lasgout...@lyx.org> wrote: > Le 16/07/14 20:41, Marcelo Galvão Póvoa a écrit : > >>> * adding a fake variable to lyxrc is bad :) >> >> >> Is there a better alternative? The variable can be made customizable >> like the others but I don't know if it makes sense. > > > Why not use the value given by the current Window? Isn't it possible to > access it? You get it from a function, there is no need to store it in a > variable. > > Note moreover that the documentation says > > Use this function only when you don't know which window you are > targeting. If you do know the target window, use > QWindow::devicePixelRatio() instead. > > [Think about a Retina MacBook plugged into a LowDPI external monitor. One > needs to know on what monitor the Window is] > > Note that you can create a fake devicePixelRatio() method for Qt4. >
I'm not sure how to easily get a pointer to the window containing the current workarea in every part of the code I need to use pixel_ratio. I could use the globally available qApp->activeWindow() macro, but what if the active window is a dialog window instead of the workarea? Besides, I currently need the device_ratio in some parts outside the Qt frontend (for example, in src/insets/RenderGraphic.cpp), so I couldn't access the window from there. Having multiple pixel ratios can indeed be an issue. For example, if a GuiImage is created in a HiDPI screen, it would be assigned a 2x ratio during initialization. But if the window is moved to a LowDPI screen afterwards, the image ratio would need to be updated. Marcelo
