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TypingSelect: rework GetTypingSelectRequest(), provide TypingSelectFindResult().

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Amend 9714594
This commit is contained in:
ocornut 2023-09-12 12:40:09 +02:00
parent 9714594c35
commit f336e639e9
2 changed files with 91 additions and 27 deletions
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13
imgui_internal.h
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@ -1540,21 +1540,23 @@ struct ImGuiNavItemData
// [SECTION] Typing-select support
//-----------------------------------------------------------------------------
// Flags for GetTypingSelectRequest()
// Flags for GetTypingSelectRequest(), TypingSelectFindResult()
enum ImGuiTypingSelectFlags_
{
ImGuiTypingSelectFlags_None = 0,
ImGuiTypingSelectFlags_AllowBackspace = 1 << 0, // Backspace to delete character inputs. If using: ensure GetTypingSelectRequest() is not called more than once per frame (filter by e.g. focus state)
ImGuiTypingSelectFlags_AllowSingleCharMode = 1 << 1, // Allow "single char" search mode which is activated when pressing the same character multiple times.
};
// Returned by GetTypingSelectRequest(), designed to eventually be public.
struct IMGUI_API ImGuiTypingSelectRequest
{
const char* SearchBuffer;
ImGuiTypingSelectFlags Flags; // Flags passed to GetTypingSelectRequest()
int SearchBufferLen;
const char* SearchBuffer;
bool SelectRequest; // Set when buffer was modified this frame, requesting a selection.
bool RepeatCharMode; // Notify when buffer contains same character repeated, to implement special mode.
ImS8 RepeatCharSize; // Length in bytes of first letter codepoint (1 for ascii, 2-4 for UTF-8). If (SearchBufferLen==RepeatCharSize) only 1 letter has been input.
bool SingleCharMode; // Notify when buffer contains same character repeated, to implement special mode.
ImS8 SingleCharSize; // Length in bytes of first letter codepoint (1 for ascii, 2-4 for UTF-8). If (SearchBufferLen==RepeatCharSize) only 1 letter has been input.
};
// Storage for GetTypingSelectRequest()
@ -3097,7 +3099,8 @@ namespace ImGui
IMGUI_API void RenderDragDropTargetRect(const ImRect& bb);
// Typing-Select API
IMGUI_API const ImGuiTypingSelectRequest* GetTypingSelectRequest(ImGuiTypingSelectFlags flags = ImGuiTypingSelectFlags_None);
IMGUI_API ImGuiTypingSelectRequest* GetTypingSelectRequest(ImGuiTypingSelectFlags flags = ImGuiTypingSelectFlags_None);
IMGUI_API int TypingSelectFindResult(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx);
// Internal Columns API (this is not exposed because we will encourage transitioning to the Tables API)
IMGUI_API void SetWindowClipRectBeforeSetChannel(ImGuiWindow* window, const ImRect& clip_rect);

83
imgui_widgets.cpp
View File

@ -6612,11 +6612,10 @@ bool ImGui::Selectable(const char* label, bool* p_selected, ImGuiSelectableFlags
// Consume character inputs and return search request, if any.
// This would typically only be called on the focused window or location you want to grab inputs for, e.g.
// if (ImGui::IsWindowFocused(...))
// if (const ImGuiTypingSelectRequest* req = ImGui::GetTypingSelectRequest())
// if (req->SearchRequest)
// // perform search
// if (ImGuiTypingSelectRequest* req = ImGui::GetTypingSelectRequest())
// focus_idx = ImGui::TypingSelectFindResult(req, my_items.size(), [](void*, int n) { return my_items[n]->Name; }, &my_items, -1);
// However the code is written in a way where calling it from multiple locations is safe (e.g. to obtain buffer).
const ImGuiTypingSelectRequest* ImGui::GetTypingSelectRequest(ImGuiTypingSelectFlags flags)
ImGuiTypingSelectRequest* ImGui::GetTypingSelectRequest(ImGuiTypingSelectFlags flags)
{
ImGuiContext& g = *GImGui;
ImGuiTypingSelectData* data = &g.TypingSelectData;
@ -6663,23 +6662,27 @@ const ImGuiTypingSelectRequest* ImGui::GetTypingSelectRequest(ImGuiTypingSelectF
if (buffer_len == 0)
return NULL;
// Return request if any
if (buffer_changed)
{
data->FocusScope = g.NavFocusScopeId;
data->LastRequestFrame = g.FrameCount;
data->LastRequestTime = (float)g.Time;
}
out_request->SearchBuffer = data->SearchBuffer;
// Return request if any
out_request->Flags = flags;
out_request->SearchBufferLen = buffer_len;
out_request->SearchBuffer = data->SearchBuffer;
out_request->SelectRequest = (data->LastRequestFrame == g.FrameCount);
out_request->RepeatCharMode = false;
out_request->RepeatCharSize = 0;
out_request->SingleCharMode = false;
out_request->SingleCharSize = 0;
// Calculate if buffer contains the same character repeated.
// - This can be used to implement a special search mode on first character.
// - Performed on UTF-8 codepoint for correctness.
// - RepeatCharMode is always set for first input character, because it usually leads to a "next".
// - SingleCharMode is always set for first input character, because it usually leads to a "next".
if (flags & ImGuiTypingSelectFlags_AllowSingleCharMode)
{
const char* buf_begin = out_request->SearchBuffer;
const char* buf_end = out_request->SearchBuffer + out_request->SearchBufferLen;
const int c0_len = ImTextCountUtf8BytesFromChar(buf_begin, buf_end);
@ -6687,12 +6690,70 @@ const ImGuiTypingSelectRequest* ImGui::GetTypingSelectRequest(ImGuiTypingSelectF
for (; p < buf_end; p += c0_len)
if (memcmp(buf_begin, p, (size_t)c0_len) != 0)
break;
out_request->RepeatCharMode = (p == buf_end);
out_request->RepeatCharSize = out_request->RepeatCharMode ? (ImS8)c0_len : 0;
out_request->SingleCharMode = (p == buf_end);
out_request->SingleCharSize = out_request->SingleCharMode ? (ImS8)c0_len : 0;
}
return out_request;
}
static int ImStrimatchlen(const char* s1, const char* s1_end, const char* s2)
{
int match_len = 0;
while (s1 < s1_end && ImToUpper(*s1++) == ImToUpper(*s2++))
match_len++;
return match_len;
}
// Default handler for finding a result for typing-select. You may implement your own.
// You might want to display a tooltip to visualize the current request.
// With same single character mode enabled:
// - it may make less sense to be displaying a tooltip.
// - the index of the currently focused item is required.
// - in the context of using BeginMultiSelect(), you may retrieve data you stored to ImGuiMultiSelectIO::NavIdItem and convert it to an index.
int ImGui::TypingSelectFindResult(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx)
{
if (req->SelectRequest == false)
return -1;
if (req->SingleCharMode && (req->Flags & ImGuiTypingSelectFlags_AllowSingleCharMode))
{
// Special handling when a same character is typed twice in a row : perform search on a single letter and goes to next.
int first_match_idx = -1;
bool return_next_match = false;
for (int idx = 0; idx < items_count; idx++)
{
const char* item_name = get_item_name_func(user_data, idx);
if (ImStrimatchlen(req->SearchBuffer, req->SearchBuffer + req->SingleCharSize, item_name) < req->SingleCharSize)
continue;
if (return_next_match) // Return next matching item after current item.
return idx;
if (first_match_idx == -1 && nav_item_idx == -1) // Return first match immediately if we don't have a nav_item_idx value.
return idx;
if (first_match_idx == -1) // Record first match for wrapping.
first_match_idx = idx;
if (nav_item_idx == idx) // Record that we encountering nav_item so we can return next match.
return_next_match = true;
}
return first_match_idx; // First result
}
// Find longest match in item list
int longest_match_idx = -1;
int longest_match_len = 0;
for (int idx = 0; idx < items_count; idx++)
{
const char* item_name = get_item_name_func(user_data, idx);
const int match_len = ImStrimatchlen(req->SearchBuffer, req->SearchBuffer + req->SearchBufferLen, item_name);
if (match_len <= longest_match_len)
continue;
longest_match_idx = idx;
longest_match_len = match_len;
if (match_len == req->SearchBufferLen)
break;
}
return longest_match_idx;
}
//-------------------------------------------------------------------------
// [SECTION] Widgets: Multi-Select support