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InputText: added comments and somehow clarified the optimized code that calculate text position + updated demo

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This commit is contained in:
ocornut 2015-10-18 10:57:29 +01:00
parent 2b3fb5c0f7
commit bc34ac882f
2 changed files with 32 additions and 18 deletions
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37
imgui.cpp
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@ -7458,35 +7458,38 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
{ {
// Count lines + find lines numbers of cursor and select_start // Count lines + find lines numbers of cursor and select_start
int matches_remaining = 0; const ImWchar* searches_input_cursor_ptr[2];
int matches_line_no[2] = { -1, -999 }; searches_input_cursor_ptr[0] = text_begin + edit_state.StbState.cursor;
const ImWchar* matches_ptr[2] = { NULL, NULL }; searches_input_cursor_ptr[1] = NULL;
matches_ptr[0] = text_begin + edit_state.StbState.cursor; matches_remaining++; int searches_remaining = 1;
int searches_result_line_number[2] = { -1, -999 };
if (edit_state.StbState.select_start != edit_state.StbState.select_end) if (edit_state.StbState.select_start != edit_state.StbState.select_end)
{ {
matches_ptr[1] = text_begin + ImMin(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);
matches_line_no[1] = -1; searches_result_line_number[1] = -1;
matches_remaining++; searches_remaining++;
} }
matches_remaining += is_multiline ? 1 : 0; // So that we never exit the loop until all lines are counted.
// 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.
searches_remaining += is_multiline ? 1 : 0;
int line_count = 0; int line_count = 0;
for (const ImWchar* s = text_begin; s < text_end+1; s++) for (const ImWchar* s = text_begin; s < text_end+1; s++)
if ((*s) == '\n' || s == text_end) if ((*s) == '\n' || s == text_end)
{ {
line_count++; line_count++;
if (matches_line_no[0] == -1 && s >= matches_ptr[0]) { matches_line_no[0] = line_count; if (--matches_remaining <= 0) break; } 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 (matches_line_no[1] == -1 && s >= matches_ptr[1]) { matches_line_no[1] = line_count; if (--matches_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; }
} }
// Calculate 2d position // Calculate 2d position by finding the beginning of the line and measuring distance
IM_ASSERT(matches_line_no[0] != -1); IM_ASSERT(searches_result_line_number[0] != -1);
cursor_offset.x = InputTextCalcTextSizeW(ImStrbolW(matches_ptr[0], text_begin), matches_ptr[0]).x; cursor_offset.x = InputTextCalcTextSizeW(ImStrbolW(searches_input_cursor_ptr[0], text_begin), searches_input_cursor_ptr[0]).x;
cursor_offset.y = matches_line_no[0] * g.FontSize; cursor_offset.y = searches_result_line_number[0] * g.FontSize;
if (matches_line_no[1] >= 0) if (searches_result_line_number[1] >= 0)
{ {
select_start_offset.x = InputTextCalcTextSizeW(ImStrbolW(matches_ptr[1], text_begin), matches_ptr[1]).x; select_start_offset.x = InputTextCalcTextSizeW(ImStrbolW(searches_input_cursor_ptr[1], text_begin), searches_input_cursor_ptr[1]).x;
select_start_offset.y = matches_line_no[1] * g.FontSize; select_start_offset.y = searches_result_line_number[1] * g.FontSize;
} }
// Calculate text height // Calculate text height

13
imgui_demo.cpp
View File

@ -422,7 +422,18 @@ void ImGui::ShowTestWindow(bool* opened)
if (ImGui::TreeNode("Multi-line Text Input")) if (ImGui::TreeNode("Multi-line Text Input"))
{ {
static bool read_only = false; static bool read_only = false;
static char text[1024*16] = "// F00F bug\nlabel:\n\tlock cmpxchg8b eax\n"; static char text[1024*16] =
"/*\n"
" The Pentium F00F bug, shorthand for F0 0F C7 C8,\n"
" the hexadecimal encoding of one offending instruction,\n"
" more formally, the invalid operand with locked CMPXCHG8B\n"
" instruction bug, is a design flaw in the majority of\n"
" Intel Pentium, Pentium MMX, and Pentium OverDrive\n"
" processors (all in the P5 microarchitecture).\n"
"*/\n\n"
"label:\n"
"\tlock cmpxchg8b eax\n";
ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0,0)); ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0,0));
ImGui::Checkbox("Read-only", &read_only); ImGui::Checkbox("Read-only", &read_only);
ImGui::PopStyleVar(); ImGui::PopStyleVar();