009-imGui窗口中的多行文本框InputTextMultiline

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009-imGui窗口中的多行文本框InputTextMultiline





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学习目标:
    多行文本框InputTextMultiline
        文本框的回调函数
       
   

    IMGUI_API bool
        InputText(
        const char* label, //UI名字,不会被显示 相当于人的身份证 以区别不同的UI对象
        char* buf, // 显示内容缓冲区 保存文本的变化
        size_t buf_size,  //显示内容缓冲区大小
        //以下可用默认值
        ImGuiInputTextFlags flags = 0,
        ImGuiInputTextCallback callback = NULL,
        void* user_data = NULL);
       
    IMGUI_API bool
        InputTextMultiline(
        const char* label, //UI名字,不会被显示 相当于人的身份证 以区别不同的UI对象
        char* buf,
        size_t buf_size,
        //以下可用默认值
        const ImVec2& size = ImVec2(0, 0),  //UI宽度 高度
        ImGuiInputTextFlags flags = 0,  //显示标志位
        ImGuiInputTextCallback callback = NULL,  //回调函数
        void* user_data = NULL); //用户数组
   
   // Callback function for ImGui::InputText()   
   typedef int     (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData* data);   
   // int callback(ImGuiInputTextCallbackData* data);   

   // ImGuiInputTextFlags
   enum ImGuiInputTextFlags_
{
    ImGuiInputTextFlags_None                = 0,
    ImGuiInputTextFlags_CharsDecimal        = 1 << 0,   // Allow 0123456789.+-*/
    ImGuiInputTextFlags_CharsHexadecimal    = 1 << 1,   // Allow 0123456789ABCDEFabcdef
    ImGuiInputTextFlags_CharsUppercase      = 1 << 2,   // Turn a..z into A..Z
    ImGuiInputTextFlags_CharsNoBlank        = 1 << 3,   // Filter out spaces, tabs
    ImGuiInputTextFlags_AutoSelectAll       = 1 << 4,   // Select entire text when first taking mouse focus
    ImGuiInputTextFlags_EnterReturnsTrue    = 1 << 5,   // Return 'true' when Enter is pressed (as opposed to every time the value was modified). Consider looking at the IsItemDeactivatedAfterEdit() function.
    ImGuiInputTextFlags_CallbackCompletion  = 1 << 6,   // Callback on pressing TAB (for completion handling)
    ImGuiInputTextFlags_CallbackHistory     = 1 << 7,   // Callback on pressing Up/Down arrows (for history handling)
    ImGuiInputTextFlags_CallbackAlways      = 1 << 8,   // Callback on each iteration. User code may query cursor position, modify text buffer.
    ImGuiInputTextFlags_CallbackCharFilter  = 1 << 9,   // Callback on character inputs to replace or discard them. Modify 'EventChar' to replace or discard, or return 1 in callback to discard.
    ImGuiInputTextFlags_AllowTabInput       = 1 << 10,  // Pressing TAB input a '\t' character into the text field
    ImGuiInputTextFlags_CtrlEnterForNewLine = 1 << 11,  // In multi-line mode, unfocus with Enter, add new line with Ctrl+Enter (default is opposite: unfocus with Ctrl+Enter, add line with Enter).
    ImGuiInputTextFlags_NoHorizontalScroll  = 1 << 12,  // Disable following the cursor horizontally
    ImGuiInputTextFlags_AlwaysOverwrite     = 1 << 13,  // Overwrite mode 覆盖模式
    ImGuiInputTextFlags_ReadOnly            = 1 << 14,  // Read-only mode 只读模式
    ImGuiInputTextFlags_Password            = 1 << 15,  // Password mode, display all characters as '*'
    ImGuiInputTextFlags_NoUndoRedo          = 1 << 16,  // Disable undo/redo. Note that input text owns the text data while active, if you want to provide your own undo/redo stack you need e.g. to call ClearActiveID().
    ImGuiInputTextFlags_CharsScientific     = 1 << 17,  // Allow 0123456789.+-*/eE (Scientific notation input)
    ImGuiInputTextFlags_CallbackResize      = 1 << 18,  // Callback on buffer capacity changes request (beyond 'buf_size' parameter value), allowing the string to grow. Notify when the string wants to be resized (for string types which hold a cache of their Size). You will be provided a new BufSize in the callback and NEED to honor it. (see misc/cpp/imgui_stdlib.h for an example of using this)
    ImGuiInputTextFlags_CallbackEdit        = 1 << 19,  // Callback on any edit (note that InputText() already returns true on edit, the callback is useful mainly to manipulate the underlying buffer while focus is active)
    ImGuiInputTextFlags_EscapeClearsAll     = 1 << 20,  // Escape key clears content if not empty, and deactivate otherwise (contrast to default behavior of Escape to revert)

    // Obsolete names
    //ImGuiInputTextFlags_AlwaysInsertMode  = ImGuiInputTextFlags_AlwaysOverwrite   // [renamed in 1.82] name was not matching behavior
};


  static int testEditCallback(ImGuiInputTextCallbackData* data)
  {
      
      printf("data->EventChar=%d buf=%s EventKey=%d EventFlag=%d\r\n",
          data->EventChar,
          data->Buf,
          data->EventKey,
          data->EventFlag
          );

      if (data->EventChar >='a'&& data->EventChar <= 'c')
      {
          return 1; //过滤 屏蔽掉输入
      }
      else
      {
          return 0;
      }
     
      
  }
   

  void CDX11::多行文本输入框()
  

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