Primary windows does't continuously refresh its content while resized

[abey79]

Version of Dear PyGui:

Version: 0.6.117

OS

Operating System: macOS 10.15.7
(but according to @hoffstadt this issue probably affects all OSs)

Issue

When a non-primary window is resized, its content is refreshed continuously. For a primary window, the content is not refreshed until the user releases the mouse. Instead, the frame buffer is simply scaled which leads to an inelegant display in most cases.

Video demo:

Screen.Recording.2020-12-30.at.18.11.30.mp4

The first half exhibits the issue, the second shows the result when using the proposed workaround.

Workaround

Add this code before start_dearpygui():

def redraw(sender, data):
    render_dearpygui_frame()


def post_init(sender, data):
    set_resize_callback(redraw)


set_start_callback(post_init)

Notes

• Going through set_start_callback() is required because otherwise redraw() is first called too early and leads to a crash at boot.
• The workaround is not perfect because some "scaled frame buffer" frames are still visible between properly rendered frame. This is visible in the video above (a few glitches when the plot window is non-primary, and a wobbly effect when it is primary). The result is still vastly superior than the default situation.

[abey79]

Relevant exchange on Discord: https://discord.com/channels/736279277242417272/748937741902938186/793881882181894164

[hoffstadt]

Fixed in next release!

[abey79]

@hoffstadt This commit appears to only address the Windows platform. Has this been fixed on Mac (and Linux?) before?

[hoffstadt]

I believe it was fixed for those platforms in the past, however it's been a while since I've been on those platforms so I could be wrong!