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TypingSelect: tidy up some more + split ino functions to make reuse s…
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…impler.
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@ocornut
ocornut committed Sep 14, 2023
1 parent 661a70f commit 779568b
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Showing 2 changed files with 44 additions and 33 deletions.
8 changes: 5 additions & 3 deletions imgui_internal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1559,7 +1559,7 @@ struct ImGuiNavItemData
// [SECTION] Typing-select support
//-----------------------------------------------------------------------------

// Flags for GetTypingSelectRequest(), TypingSelectFindResult()
// Flags for GetTypingSelectRequest()
enum ImGuiTypingSelectFlags_
{
ImGuiTypingSelectFlags_None = 0,
Expand All @@ -1572,7 +1572,7 @@ struct IMGUI_API ImGuiTypingSelectRequest
{
ImGuiTypingSelectFlags Flags; // Flags passed to GetTypingSelectRequest()
int SearchBufferLen;
const char* SearchBuffer;
const char* SearchBuffer; // Search buffer contents (use full string. unless SingleCharMode is set, in which case use SingleCharSize).
bool SelectRequest; // Set when buffer was modified this frame, requesting a selection.
bool SingleCharMode; // Notify when buffer contains same character repeated, to implement special mode. In this situation it preferred to not display any on-screen search indication.
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.
Expand Down Expand Up @@ -3126,7 +3126,9 @@ namespace ImGui

// Typing-Select API
IMGUI_API ImGuiTypingSelectRequest* GetTypingSelectRequest(ImGuiTypingSelectFlags flags = ImGuiTypingSelectFlags_None);
IMGUI_API int TypingSelectFindTargetIndex(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx);
IMGUI_API int TypingSelectFindMatch(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx);
IMGUI_API int TypingSelectFindNextSingleCharMatch(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx);
IMGUI_API int TypingSelectFindBestLeadingMatch(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data);

// 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);
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69 changes: 39 additions & 30 deletions imgui_widgets.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6614,7 +6614,7 @@ bool ImGui::Selectable(const char* label, bool* p_selected, ImGuiSelectableFlags
// This would typically only be called on the focused window or location you want to grab inputs for, e.g.
// if (ImGui::IsWindowFocused(...))
// if (ImGuiTypingSelectRequest* req = ImGui::GetTypingSelectRequest())
// focus_idx = ImGui::TypingSelectFindResult(req, my_items.size(), [](void*, int n) { return my_items[n]->Name; }, &my_items, -1);
// focus_idx = ImGui::TypingSelectFindMatch(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).
ImGuiTypingSelectRequest* ImGui::GetTypingSelectRequest(ImGuiTypingSelectFlags flags)
{
Expand Down Expand Up @@ -6721,45 +6721,54 @@ static int ImStrimatchlen(const char* s1, const char* s1_end, const char* s2)
}

// 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.
// You might want to display a tooltip to visualize the current request SearchBuffer
// When SingleCharMode is set:
// - it is better to NOT display a tooltip of other on-screen display indicator.
// - the index of the currently focused item is required.
// if your SetNextItemSelectionData() values are index, you can obtain it from ImGuiMultiSelectIO::NavIdItem, otherwise from g.NavLastValidSelectionUserData.
int ImGui::TypingSelectFindTargetIndex(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx)
// if your SetNextItemSelectionData() values are indices, you can obtain it from ImGuiMultiSelectIO::NavIdItem, otherwise from g.NavLastValidSelectionUserData.
int ImGui::TypingSelectFindMatch(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx)
{
if (req->SelectRequest == false)
if (req == NULL || req->SelectRequest == false) // Support NULL parameter so both calls can be done from same spot.
return -1;

ImGuiContext& g = *GImGui;
g.NavDisableMouseHover = true;
int idx = -1;
if (req->SingleCharMode && (req->Flags & ImGuiTypingSelectFlags_AllowSingleCharMode))
{
// FIXME: Assume selection user data is index. Would be extremely practical.
//if (nav_item_idx == -1)
// nav_item_idx = (int)g.NavLastValidSelectionUserData;
idx = TypingSelectFindNextSingleCharMatch(req, items_count, get_item_name_func, user_data, nav_item_idx);
else
idx = TypingSelectFindBestLeadingMatch(req, items_count, get_item_name_func, user_data);
if (idx != -1)
g.NavDisableMouseHover = true;
return idx;
}

// 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
// Special handling when a single character is repeated: perform search on a single letter and goes to next.
int ImGui::TypingSelectFindNextSingleCharMatch(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data, int nav_item_idx)
{
// FIXME: Assume selection user data is index. Would be extremely practical.
//if (nav_item_idx == -1)
// nav_item_idx = (int)g.NavLastValidSelectionUserData;

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 ImGui::TypingSelectFindBestLeadingMatch(ImGuiTypingSelectRequest* req, int items_count, const char* (*get_item_name_func)(void*, int), void* user_data)
{
int longest_match_idx = -1;
int longest_match_len = 0;
for (int idx = 0; idx < items_count; idx++)
Expand Down

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