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InputText: callback InsertChars() support resize callbacks correctly (followup to 24ff259) + fixed demo to use those functions. (#2006, #1443, #1008).

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omar
2018-08-22 12:33:54 +02:00
parent ea1906004b
commit 8d639ec60d
4 changed files with 39 additions and 18 deletions
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8
imgui.h
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@ -1419,7 +1419,7 @@ struct ImGuiStorage
// The callback function should return 0 by default.
// Special processing:
// - ImGuiInputTextFlags_CallbackCharFilter: return 1 if the character is not allowed. You may also set 'EventChar=0' as any character replacement are allowed.
// - ImGuiInputTextFlags_CallbackResize: BufTextLen is set to the new desired string length so you can allocate or update the size on your side of the fence. No need to initialize new characters or zero-terminator as InputText will do it.
// - ImGuiInputTextFlags_CallbackResize: notified by InputText() when the string is resized. BufTextLen is set to the new desired string length so you can update the string size on your side of the fence. You can also replace Buf pointer if your underlying data is reallocated. No need to initialize new characters or zero-terminator as InputText will do it right after the resize callback.
struct ImGuiInputTextCallbackData
{
ImGuiInputTextFlags EventFlag; // One ImGuiInputTextFlags_Callback* // Read-only
@ -1427,7 +1427,8 @@ struct ImGuiInputTextCallbackData
void* UserData; // What user passed to InputText() // Read-only
// Arguments for the different callback events
// (If you modify the 'buf' contents make sure you update 'BufTextLen' and set 'BufDirty' to true!)
// - To modify the text buffer in a callback, prefer using the InsertChars() / DeleteChars() function. InsertChars() will take care of calling the resize callback if necessary.
// - If you know your edits are not going to resize the underlying buffer allocation, you may modify the contents of 'Buf[]' directly. You need to update 'BufTextLen' accordingly (0 <= BufTextLen < BufSize) and set 'BufDirty'' to true so InputText can update its internal state.
ImWchar EventChar; // Character input // Read-write // [CharFilter] Replace character or set to zero. return 1 is equivalent to setting EventChar=0;
ImGuiKey EventKey; // Key pressed (Up/Down/TAB) // Read-only // [Completion,History]
char* Buf; // Text buffer // Read-write // [Resize] Can replace pointer / [Completion,History,Always] Only write to pointed data, don't replace the actual pointer!
@ -1438,7 +1439,8 @@ struct ImGuiInputTextCallbackData
int SelectionStart; // // Read-write // [Completion,History,Always] == to SelectionEnd when no selection)
int SelectionEnd; // // Read-write // [Completion,History,Always]
// NB: Helper functions for text manipulation. Calling those function loses selection.
// Helper functions for text manipulation.
// Use those function to benefit from the CallbackResize behaviors. Calling those function reset the selection.
ImGuiInputTextCallbackData();
IMGUI_API void DeleteChars(int pos, int bytes_count);
IMGUI_API void InsertChars(int pos, const char* text, const char* text_end = NULL);