I didn’t get anything done on KFM over the weekend (was concentrating on figuring out that IMAP problem), so I felt a bit guilty and did some work today.
I wrote a drag-selection method, which allows you to select files by dragging a rectangle around them.
It’s surprising how many different variables need to be considered, to decide whether a file is selected or not!
For instance, here is the
if block which decides whether a file is contained in a selection area, or is touched by it:
if( kfm_isPointInBox(x3,y3,x1,y1,x2,y2)|| kfm_isPointInBox(x4,y3,x1,y1,x2,y2)|| kfm_isPointInBox(x3,y4,x1,y1,x2,y2)|| kfm_isPointInBox(x4,y4,x1,y1,x2,y2)|| kfm_isPointInBox(x1,y1,x3,y3,x4,y4)|| kfm_isPointInBox(x2,y1,x3,y3,x4,y4)|| kfm_isPointInBox(x1,y2,x3,y3,x4,y4)|| kfm_isPointInBox(x2,y2,x3,y3,x4,y4)|| (x1>=x3&&x2<=x4&&y1<=y3&&y2>=y4)|| (x1<=x3&&x2>=x4&&y1>=y3&&y2<=y4) )kfm_addToSelection(file);
In the above,
[x2,y2] are the top-left and bottom-right of the selection area, and
[x4,y4] are the top-left and bottom-right of the file icons.
I’m sure there must be a more efficient way than that!
Actually, the code I wrote can easily be made more efficient by applying a binary tree algorithm to find the first and last icons which should be considered at all (if the selection starts at
[100,343] for example, then all icons with
y4<343 can be confidently pruned).
That’s the visible work for today. I’m going to take a short break, then get onto a bit of files house-keeping.