Hi,
I'm encountering an issue with TImageEnMView when selecting thumbnails using the mouse.
Suppose I have 100 thumbnails loaded, but the visible area can only show 2 at a time. If I start dragging a selection rectangle from the first thumbnail downward, intending to select all 100 items, I notice that only the scrollbar moves — the image area itself does not update during the drag. The display stays stuck showing just the first two thumbnails until I release the mouse button.
This behavior feels a bit unexpected, as most applications update the viewport while dragging to reflect the current scroll position.
Example:
Image 1: I resized the official “Database Thumb Viewer” demo so that only two thumbnails are visible at a time.
Image 2: I begin dragging the selection rectangle over the first two items.
Image 3: I continue dragging the mouse down toward the last thumbnail (without releasing the button), but the display does not scroll to show the lower items — only the scrollbar moves. Once I release the mouse, the view updates instantly.
Is there a way to make the display update dynamically while dragging the selection?
This would offer a more intuitive user experience.
Thanks in advance!
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Issue with Mouse-Based Selection Not Updating View in TImageEnMView
Posted - Jul 22 2025 : 19:39:45
