Cache problem when preview picture use QAbstractItemDelegate in QListWidget.
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i write a delegate to preview the picture in the QListWidget, but there are lots of pictures, and there should be a cache method to Only load and show the Items in the current viewRect.
how can i get the items in the current viewport?
and now i use QPixmap, is there any way to cache it? i know when construct it use: QPixmap ppp(strFilePath), it will be loaded and the file is read...so is there any way to use it in order to work with the Cache mechanism?thank you
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Hi,
QPixmapCache and visualItemRect comes to mind for that
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thank you, is it right to use QPixmap to open the image file in order to preview the images?
i found when there are lots of image files, it's very slow to load.
is there any good way to accelerate this?
or may i load there QListWidgetItems one by one, which will make the user feel a little better...
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You can create downscaled thumbnails of the images and load them rather than the original
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u mean i manually downscale the original image to another image file whose resolution is smaller.
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Yes, that's it
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@SGaist You can create downscaled thumbnails of the images and load them rather than the original
is there any way to use Qt to downscale various kind formats of pictures?
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@opengpu2 See @Chris-Kawa answer to your other thread
