Overwriting GUIBuilder Window Creation Callback

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    • Overwriting GUIBuilder Window Creation Callback

      Hello
      How Can I overwrite GUIBuilder window creation callback. I want to draw a window with gradient background color.

      I tried the following modification on GUIBuilder output, but i did not work.

      (Compiler warning is included at the bottom of code)

      C Source Code: Gradient window

      1. /*********************************************************************
      2. * *
      3. * SEGGER Microcontroller GmbH & Co. KG *
      4. * Solutions for real time microcontroller applications *
      5. * *
      6. **********************************************************************
      7. * *
      8. * C-file generated by: *
      9. * *
      10. * GUI_Builder for emWin version 5.32 *
      11. * Compiled Oct 8 2015, 11:59:02 *
      12. * (c) 2015 Segger Microcontroller GmbH & Co. KG *
      13. * *
      14. **********************************************************************
      15. * *
      16. * Internet: www.segger.com Support: support@segger.com *
      17. * *
      18. **********************************************************************
      19. */
      21. // USER START (Optionally insert additional includes)
      22. // USER END
      24. #include "DIALOG.h"
      26. /*********************************************************************
      27. *
      28. * Defines
      29. *
      30. **********************************************************************
      31. */
      32. #define ID_WINDOW_0 (GUI_ID_USER + 0x00)
      35. // USER START (Optionally insert additional defines)
      36. // USER END
      38. /*********************************************************************
      39. *
      40. * Static data
      41. *
      42. **********************************************************************
      43. */
      45. // USER START (Optionally insert additional static data)
      46. static void _cbWin0(WM_MESSAGE * pMsg) {
      47. GUI_RECT Rect;
      49. switch (pMsg->MsgId) {
      50. case WM_PAINT:
      51. WM_GetClientRect(&Rect);
      52. GUI_DrawGradientH(Rect.x0, Rect.y0, Rect.x1, Rect.y1, GUI_RED, GUI_BLUE);
      53. break;
      54. default:
      55. WM_DefaultProc(pMsg);
      56. break;
      57. }
      58. }
      59. // USER END
      61. /*********************************************************************
      62. *
      63. * _aDialogCreate
      64. */
      65. static const GUI_WIDGET_CREATE_INFO _aDialogCreate[] = {
      66. { WINDOW_CreateIndirect, "Gradient", ID_WINDOW_0, 0, 0, 320, 240, 0, 0x0, _cbWin0 },
      67. // USER START (Optionally insert additional widgets)
      68. // USER END
      69. };
      71. /*********************************************************************
      72. *
      73. * Static code
      74. *
      75. **********************************************************************
      76. */
      78. // USER START (Optionally insert additional static code)
      79. // USER END
      81. /*********************************************************************
      82. *
      83. * _cbDialog
      84. */
      85. static void _cbDialog(WM_MESSAGE * pMsg) {
      86. // USER START (Optionally insert additional variables)
      87. // USER END
      89. switch (pMsg->MsgId) {
      90. // USER START (Optionally insert additional message handling)
      91. // USER END
      92. default:
      93. WM_DefaultProc(pMsg);
      94. break;
      95. }
      96. }
      98. /*********************************************************************
      99. *
      100. * Public code
      101. *
      102. **********************************************************************
      103. */
      104. /*********************************************************************
      105. *
      106. * CreateGradient
      107. */
      108. WM_HWIN CreateGradient(void);
      109. WM_HWIN CreateGradient(void) {
      110. WM_HWIN hWin;
      112. hWin = GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, WM_HBKWIN, 0, 0);
      113. return hWin;
      114. }
      116. // USER START (Optionally insert additional public code)
      117. // USER END
      119. /*************************** End of file ****************************/
      130. //*************************************************
      132. Compiler output:
      134. ->Warinigs (1 Item)
      135. initialization makes integer from pointer without a cast [-Wint-conversion]
      136. ->Infos (1 Item)
      137. (near initialization for '_aDialogCreate[0].NumExtraBytes')
      138. **************************************************/
      Display All
      Thanks in advance

    • Hi,

      the GUI_WIDGET_CREATE_INFO structure is defined as follows:

      C Source Code

      1. struct GUI_WIDGET_CREATE_INFO_struct {
      2. GUI_WIDGET_CREATE_FUNC * pfCreateIndirect;
      3. const char * pName; // Text ... Not used on all widgets
      4. I16 Id; // ID ... should be unique in a dialog
      5. I16 x0; // x position
      6. I16 y0; // y position
      7. I16 xSize; // x size
      8. I16 ySize; // y size
      9. U16 Flags; // Widget specific create flags (opt.)
      10. I32 Para; // Widget specific parameter (opt.)
      11. U32 NumExtraBytes; // Number of extra bytes usable with <WIDGET>_SetUserData & <WIDGET>_GetUserData
      12. };
      Display All
      As last parameter you passed a pointer to a callback function, where the number of extra bytes to be allocated should be. So instead of _cbWin, you can just pass 0 as last parameter.
      The WINDOW widget in your _aDialogCreate structure is not a separate window widget, it is the dialog. So, to draw a gradient you don't need another callback, you can just copy the WM_PAINT case from _cbWin0 into the _cbDialog callback.

      Best regards,

      Florian
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