PG_EventDPI Structure - ProGUI Reference Manual

Description

This structure holds data passed to the event handler for the #PG_Event_DPI event. This event is triggered when a ProGUI window's DPI settings change, typically because the window has been moved to a display monitor with different scaling settings.

Structure Definition

Structure PG_EventDPI
  dpiX.i ; The new horizontal DPI value of the window's current monitor
  dpiY.i ; The new vertical DPI value of the window's current monitor
  dpiScaleX.d ; The new horizontal DPI scaling factor (dpiX / 96.0)
  dpiScaleY.d ; The new vertical DPI scaling factor (dpiY / 96.0)

  width.d ; Suggested new width for the window in Device Independent Pixels (DIPs), adjusted for the new DPI
  height.d ; Suggested new height for the window in Device Independent Pixels (DIPs), adjusted for the new DPI
  widthPixels.i ; Suggested new width for the window in physical pixels, adjusted for the new DPI
  heightPixels.i ; Suggested new height for the window in physical pixels, adjusted for the new DPI
EndStructure

Members

dpiX.i
The new horizontal Dots Per Inch setting of the monitor the window is now on.

dpiY.i
The new vertical Dots Per Inch setting of the monitor the window is now on.

dpiScaleX.d
The calculated horizontal scaling factor based on the new DPI (dpiX / 96.0).

dpiScaleY.d
The calculated vertical scaling factor based on the new DPI (dpiY / 96.0).

width.d
The suggested width the window should be resized to, in DIPs, to maintain its apparent size on the new display. ProGUI typically handles this automatically via WindowResize() internally before dispatching the event.

height.d
The suggested height the window should be resized to, in DIPs.

widthPixels.i
The suggested width the window should be resized to, in physical pixels.

heightPixels.i
The suggested height the window should be resized to, in physical pixels.

Used By Events

#PG_Event_DPI

Remarks

When the #PG_Event_DPI event is received, ProGUI has usually already initiated a resize of the window based on the suggested pixel dimensions (`widthPixels`, `heightPixels`). Your handler for this event should typically be used to update any resources or perform calculations that are DPI-dependent and not automatically handled by ProGUI's layout and drawing systems (e.g., regenerating cached bitmaps at the new resolution, adjusting font sizes for OS widgets if not handled automatically). ProGUI redraws the window automatically after a DPI change.

You can use the new scaling factors (`dpiScaleX`, `dpiScaleY`) to manually adjust non-ProGUI elements or perform custom scaling calculations if needed.

Supported OS