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InputText: removed the need for text_end pointer in the cursor position calculation loop, allows switching buffers

This commit is contained in:
ocornut 2015-10-18 15:25:36 +01:00
parent 214e87d59c
commit b090d711e2
1 changed files with 15 additions and 14 deletions
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29
imgui.cpp
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@ -7456,42 +7456,43 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
// - Measure text height (for scrollbar)
// We are attempting to do most of that in **one main pass** to minimize the computation cost (non-negligible for large amount of text) + 2nd pass for selection rendering (we could merge them by an extra refactoring effort)
const ImWchar* text_begin = edit_state.Text.Data;
const ImWchar* text_end = text_begin + edit_state.CurLenW;
ImVec2 cursor_offset, select_start_offset;
{
// Count lines + find lines numbers of cursor and select_start
const ImWchar* searches_input_cursor_ptr[2];
searches_input_cursor_ptr[0] = text_begin + edit_state.StbState.cursor;
searches_input_cursor_ptr[1] = NULL;
// Count lines + find lines numbers straddling 'cursor' and 'select_start' position.
const ImWchar* searches_input_ptr[2];
searches_input_ptr[0] = text_begin + edit_state.StbState.cursor;
searches_input_ptr[1] = NULL;
int searches_remaining = 1;
int searches_result_line_number[2] = { -1, -999 };
if (edit_state.StbState.select_start != edit_state.StbState.select_end)
{
searches_input_cursor_ptr[1] = text_begin + ImMin(edit_state.StbState.select_start, edit_state.StbState.select_end);
searches_input_ptr[1] = text_begin + ImMin(edit_state.StbState.select_start, edit_state.StbState.select_end);
searches_result_line_number[1] = -1;
searches_remaining++;
}
// Iterate all lines to find our line numbers
// In multi-line mode, we never exit the loop until all lines are counted, so add one extra to the counter.
// In multi-line mode, we never exit the loop until all lines are counted, so add one extra to the searches_remaining counter.
searches_remaining += is_multiline ? 1 : 0;
int line_count = 0;
for (const ImWchar* s = text_begin; s < text_end+1; s++)
if ((*s) == '\n' || s == text_end)
for (const ImWchar* s = text_begin; *s != 0; s++)
if (*s == '\n')
{
line_count++;
if (searches_result_line_number[0] == -1 && s >= searches_input_cursor_ptr[0]) { searches_result_line_number[0] = line_count; if (--searches_remaining <= 0) break; }
if (searches_result_line_number[1] == -1 && s >= searches_input_cursor_ptr[1]) { searches_result_line_number[1] = line_count; if (--searches_remaining <= 0) break; }
if (searches_result_line_number[0] == -1 && s >= searches_input_ptr[0]) { searches_result_line_number[0] = line_count; if (--searches_remaining <= 0) break; }
if (searches_result_line_number[1] == -1 && s >= searches_input_ptr[1]) { searches_result_line_number[1] = line_count; if (--searches_remaining <= 0) break; }
}
line_count++;
if (searches_result_line_number[0] == -1) searches_result_line_number[0] = line_count;
if (searches_result_line_number[1] == -1) searches_result_line_number[1] = line_count;
// Calculate 2d position by finding the beginning of the line and measuring distance
IM_ASSERT(searches_result_line_number[0] != -1);
cursor_offset.x = InputTextCalcTextSizeW(ImStrbolW(searches_input_cursor_ptr[0], text_begin), searches_input_cursor_ptr[0]).x;
cursor_offset.x = InputTextCalcTextSizeW(ImStrbolW(searches_input_ptr[0], text_begin), searches_input_ptr[0]).x;
cursor_offset.y = searches_result_line_number[0] * g.FontSize;
if (searches_result_line_number[1] >= 0)
{
select_start_offset.x = InputTextCalcTextSizeW(ImStrbolW(searches_input_cursor_ptr[1], text_begin), searches_input_cursor_ptr[1]).x;
select_start_offset.x = InputTextCalcTextSizeW(ImStrbolW(searches_input_ptr[1], text_begin), searches_input_ptr[1]).x;
select_start_offset.y = searches_result_line_number[1] * g.FontSize;
}