python - KIVY: AsyncImage widget resizing issue within a RecycleView -


i'll start little contextualization before explaining issues.

i implemented recycleview widget contains recycleboxlayout default_size dynamic (based on parent's size). believe needed (i'm wrong) because app used on wide variety of devices , i'd rv contains average of 4 playlistitem. here code inside .kv file:

recycleview:     id: rv     scroll_type: ['bars', 'content']     scroll_wheel_distance: dp(114)     viewclass: 'playlistitem'     recycleboxlayout:         default_size: none, (self.parent.height / 4 - dp(80)) if self.parent.height / 4 > dp(60) else dp(60)         default_size_hint: 1, none         size_hint_y: none         height: self.minimum_height         orientation: 'vertical'         spacing: dp(20)         padding: dp(20)

now let's take @ code playlistitem viewclass:

<playlistitem@boxlayout>:     created_time: ''     description: ''     id: ''     image_url: ''     name: ''     owner: ''     updated_time: ''     playlist_name: ''      mdcard:         asyncimage:             size_hint_x: .2             size: self.texture_size             source: root.image_url             mipmap: true          boxlayout:             orientation:'vertical'              mdlabel:                 text: root.playlist_name                 theme_text_color: 'secondary'                 font_style:'title'                  mdseparator:                 height: dp(1)             mdlabel:                 text: 'body'                 theme_text_color: 'primary'

so, i'd keep ratio of image inside asyncimage widget. i'd image's width take 20% of parent widget. , i'd asyncimage's size equal image's (texture) size. code above depending on window's size, image's height not equal parent's height (the result not pretty uh). when try:

asyncimage:     size_hint_y: none     height: self.parent.height     source: root.image_url     mipmap: true

the image's height (equal mdcard height) asyncimage's width can become large. here's picture better understand:

kivy's asyncimage widget resize issue

the workaround can think is:

<playlistitem@boxlayout>:     created_time: ''     description: ''     id: ''     image_url: ''     name: ''     owner: ''     updated_time: ''     playlist_name: ''      # added # <----------------------------------     size_hint_y: none     miminum_height: self.minimum_height      mdcard:         asyncimage:             size_hint_x: .2             size: self.texture_size             source: root.image_url             mipmap: true

this not working. believe @ time of init texture has not loaded yet, self.minimum_height none. i'm not sure that. hope help.

bonus detail: know sure raw images have 480px height

thanks lot attention , sorry long post.

atis on #kivy irc channel found solution. 1 should use image_ratio!:

asyncimage:     size_hint: none,none     size:self.image_ratio*root.height,root.height     source: root.image_url     mipmap: true

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