Fix #113154: Hang double-clicking on UI elements outside a text field
The logic to handle word selection from double clicking ran even when the event wasn't inside the button. This would pass an invalid position to BLI_str_cursor_step_bounds_utf8 which hung. Resolve by limiting word-selection to when the event is inside the text editing field as well as clamping the position to ensure it's within the allowed range.
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@ -345,6 +345,7 @@ void BLI_str_cursor_step_bounds_utf8(
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const char *str, const int str_maxlen, const int pos, int *r_start, int *r_end)
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{
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BLI_assert(str_maxlen >= 0);
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BLI_assert(pos >= 0 && pos <= str_maxlen);
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/* Identify the type of characters are on either side of the current cursor position. */
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const eStrCursorDelimType prev = (pos > 0) ? cursor_delim_type_utf8(str, str_maxlen, pos - 1) :
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STRCUR_DELIM_NONE;
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@ -373,6 +374,7 @@ void BLI_str_cursor_step_bounds_utf32(
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const char32_t *str, const int str_maxlen, const int pos, int *r_start, int *r_end)
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{
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BLI_assert(str_maxlen >= 0);
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BLI_assert(pos >= 0 && pos <= str_maxlen);
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/* Identify the type of characters are on either side of the current cursor position. */
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const eStrCursorDelimType prev = (pos > 0) ? cursor_delim_type_unicode(str[pos - 1]) :
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STRCUR_DELIM_NONE;
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@ -3771,14 +3771,21 @@ static void ui_do_but_textedit(
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inbox = ui_searchbox_inside(data->searchbox, event->xy);
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}
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/* for double click: we do a press again for when you first click on button
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* (selects all text, no cursor pos) */
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bool is_press_in_button = false;
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if (ELEM(event->val, KM_PRESS, KM_DBL_CLICK)) {
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float mx = event->xy[0];
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float my = event->xy[1];
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ui_window_to_block_fl(data->region, block, &mx, &my);
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if (ui_but_contains_pt(but, mx, my)) {
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is_press_in_button = true;
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}
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}
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/* for double click: we do a press again for when you first click on button
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* (selects all text, no cursor pos) */
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if (ELEM(event->val, KM_PRESS, KM_DBL_CLICK)) {
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if (is_press_in_button) {
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ui_textedit_set_cursor_pos(but, data, event->xy[0]);
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but->selsta = but->selend = but->pos;
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data->sel_pos_init = but->pos;
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@ -3798,16 +3805,23 @@ static void ui_do_but_textedit(
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/* only select a word in button if there was no selection before */
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if (event->val == KM_DBL_CLICK && had_selection == false) {
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if (is_press_in_button) {
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const int str_len = strlen(data->str);
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/* This may not be necessary, additional check to ensure `pos` is never out of range,
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* since negative values aren't acceptable, see: #113154. */
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CLAMP(but->pos, 0, str_len);
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int selsta, selend;
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BLI_str_cursor_step_bounds_utf8(data->str, strlen(data->str), but->pos, &selsta, &selend);
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BLI_str_cursor_step_bounds_utf8(data->str, str_len, but->pos, &selsta, &selend);
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but->pos = short(selend);
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but->selsta = short(selsta);
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but->selend = short(selend);
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/* Anchor selection to the left side unless the last word. */
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data->sel_pos_init = ((selend == strlen(data->str)) && (selsta != 0)) ? selend : selsta;
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data->sel_pos_init = ((selend == str_len) && (selsta != 0)) ? selend : selsta;
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retval = WM_UI_HANDLER_BREAK;
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changed = true;
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}
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}
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else if (inbox) {
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/* if we allow activation on key press,
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* it gives problems launching operators #35713. */
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