deselect

perl6 What is a quick way to de-select array or list elements?

由 你说的曾经没有我的故事 提交于 2020-04-12 09:03:09
问题 To select multiple elements from an array in perl6, it is easy: just use a list of indices: > my @a = < a b c d e f g >; > @a[ 1,3,5 ] (b d f) But to de-select those elements, I had to use Set: > say @a[ (@a.keys.Set (-) (1,3,5)).keys.sort ] (a c e g) I am wondering if there is an easier way because the arrays I use are often quite large? 回答1: sub infix:<not-at> ($elems, @not-ats) { my $at = 0; flat gather for @not-ats -> $not-at { when $at < $not-at { take $at++ xx $not-at - $at } NEXT { $at

PyQt or PySide: QTextEdit deselect all

由 允我心安 提交于 2019-12-19 09:26:37
问题 I'm using PySide(PyQt is fine as well) and I want to deselect everything inside a QTextEdit. Selecting everything is very easy and it's done by self.textedit.selectAll(), but I can't find a simple way to deselect everything. Is there a straightforward way to do it that I'm not aware of or is it more complicated than that? Thanks. 回答1: You want to first get the QTextCursor for the QTextEdit my_text_cursor = my_text_edit.textCursor() Then clear the selection of the QTextCursor my_text_cursor

Why select/deselect checkbox works only once with jQuery?

由 谁说我不能喝 提交于 2019-12-13 18:10:50
问题 I've a simple Select/Deselect option to check and uncheck checkboxes in my page. It works well, but only once. I don't know what's the problem for! Please take a look at my codes. You can see its demo here. HTML codes: <input type="checkbox" id="main" />Select All<br /> <input type="checkbox" class="options" />Item 1<br /> <input type="checkbox" class="options" />Item 2<br /> <input type="checkbox" class="options" />Item 3<br /> <input type="checkbox" class="options" />Item 4<br /> jQuery

How to avoid mistakes index out of range?

由 点点圈 提交于 2019-12-11 02:07:34
问题 I try to select multiple items in collectionCell , but if i tap many times for deselect cell i get an error Thread 1: Fatal error: Index out of range On this line selectedTimeIntervalArray.remove(at: indexPath.item) on indexPath.item == 1 . How to avoid this error ? func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { let selectedCell = collectionView.cellForItem(at: indexPath) if indexPath.item == 0 { selectedBackgroundColor(cell: selectedCell!)

Swift - UITableView didSelectRowAtIndexPath & didDeselectRowAtIndexPath Add & Remove indexPath IDs

由 末鹿安然 提交于 2019-11-30 05:30:40
This is the code: func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { let selectedItem = items.objectAtIndex(indexPath.row) as String let itemId = selectedItem.componentsSeparatedByString("$%^") //itemId[1] - Item Id } func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) { let selectedItem = items.objectAtIndex(indexPath.row) as String let itemId = selectedItem.componentsSeparatedByString("$%^") //itemId[1] - Item Id } How to add Item Id "in Array or in String or something else..."? When you select rows 0,1,4,5 for

Swift - UITableView didSelectRowAtIndexPath & didDeselectRowAtIndexPath Add & Remove indexPath IDs

由 橙三吉。 提交于 2019-11-29 03:07:49
问题 This is the code: func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { let selectedItem = items.objectAtIndex(indexPath.row) as String let itemId = selectedItem.componentsSeparatedByString("$%^") //itemId[1] - Item Id } func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) { let selectedItem = items.objectAtIndex(indexPath.row) as String let itemId = selectedItem.componentsSeparatedByString("$%^") //itemId[1] - Item Id }
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