Custom Callback with Button

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    • Custom Callback with Button

      Hi,

      The goal is to create a button with Multi strings where the strings have different fonts from each other, So as suggested by emwin documentation I have created a custom callback function but I observe that the custom callback is overwriting all the previous set properties. The codes are as follows

      Source Code

      1. hButton = WM_GetDialogItem(pMsg->hWin, ID_BUTTON1);
      2. WM_SetCallback(hButton , CallBack_Button);
      4. hButton = WM_GetDialogItem(pMsg->hWin, ID_BUTTON1);
      5. BUTTON_SetBkColor(hButton, BUTTON_CI_UNPRESSED, SKY_BLUE);
      6. BUTTON_SetBkColor(hButton, BUTTON_CI_PRESSED, HEADER_OFFWHITE);
      7. BUTTON_SetTextColor(hButton, BUTTON_CI_PRESSED, BASE_BLUE);
      8. BUTTON_SetTextColor(hButton, BUTTON_CI_UNPRESSED, BASE_BLUE);

      the callback function

      Source Code

      1. void CallBack_Button(WM_MESSAGE * pMsg) {
      2. GUI_RECT Rect;
      3. int Index;
      4. int TextAlign;
      6. switch (pMsg->MsgId) {
      7. case WM_PAINT:
      10. WM_GetClientRect(&Rect);
      12. if(BUTTON_IsPressed(pMsg->hWin)) {
      13. GUI_SetBkColor(HEADER_OFFWHITE);
      14. GUI_SetColor(BASE_BLUE);
      16. } else {
      17. GUI_SetBkColor(BASE_BLUE);
      18. GUI_SetColor(SKY_BLUE);
      19. }
      20. GUI_SetFont(&GUI_Fontsymbols_Regular_36);
      21. GUI_DispCharAt('&',Rect.x0 + 10,Rect.y0 + 10);
      23. GUI_SetFont(&GUI_Font_UI_Tab_Bold_22);
      24. GUI_DispStringAt("Stop",Rect.x0 + 40,Rect.y0 + 10);
      25. break;
      26. default:
      27. BUTTON_Callback(pMsg);
      28. break;
      29. }
      30. }
      Display All
      the result would be that
      the entire OFF_WHITE background is replaced by white color except for the two strings. Is there any method where the button_<routines> can be used along with custom modifications.

      Thanks

      The post was edited 2 times, last by Suresh ().

    • Hi,

      With the default skin of the BUTTON widget the functions BUTTON_SetBkColor() and BUTTON_SetTextColor() are not working. Either set the classic skin or use SKINFLEX properties to change properties like colors.

      If you overwrite the callback function of a widget you can call the default callback function (e.g BUTTON_Callback()) and then draw something.

      Here is a brief example how this could be done:

      C Source Code

      1. #include "DIALOG.h"
      3. /*********************************************************************
      4. *
      5. * Static code
      6. *
      7. **********************************************************************
      8. */
      9. /*********************************************************************
      10. *
      11. * _cbButton
      12. */
      13. static void _cbButton(WM_MESSAGE * pMsg) {
      14. GUI_RECT Rect;
      16. switch(pMsg->MsgId) {
      17. case WM_PAINT:
      18. BUTTON_Callback(pMsg);
      19. WM_GetClientRect(&Rect);
      20. if(BUTTON_IsPressed(pMsg->hWin)) {
      21. GUI_SetBkColor(GUI_WHITE);
      22. GUI_SetColor(GUI_BLUE);
      23. } else {
      24. GUI_SetBkColor(GUI_BLUE);
      25. GUI_SetColor(GUI_LIGHTBLUE);
      26. }
      27. GUI_SetFont(&GUI_Font13_1);
      28. GUI_DispCharAt('&',Rect.x0 + 10,Rect.y0 + 10);
      29. GUI_SetFont(&GUI_Font13B_1);
      30. GUI_DispStringAt("Stop",Rect.x0 + 40,Rect.y0 + 10);
      31. break;
      32. default:
      33. BUTTON_Callback(pMsg);
      34. }
      35. }
      37. /*********************************************************************
      38. *
      39. * _cbBk
      40. */
      41. static void _cbBk(WM_MESSAGE * pMsg) {
      42. switch (pMsg->MsgId) {
      43. case WM_PAINT:
      44. GUI_SetBkColor(GUI_BLACK);
      45. GUI_Clear();
      46. break;
      47. default:
      48. WM_DefaultProc(pMsg);
      49. break;
      50. }
      51. }
      53. /*********************************************************************
      54. *
      55. * Public code
      56. *
      57. **********************************************************************
      58. */
      59. /*********************************************************************
      60. *
      61. * MainTask
      62. */
      63. void MainTask(void) {
      64. BUTTON_Handle hButton;
      66. GUI_Init();
      67. WM_MULTIBUF_Enable(1);
      68. WM_SetCallback(WM_HBKWIN, _cbBk);
      69. hButton = BUTTON_CreateEx(10, 10, 100, 30, WM_HBKWIN, WM_CF_SHOW | WM_CF_HASTRANS, 0, GUI_ID_BUTTON0);
      70. WM_SetCallback(hButton, _cbButton);
      71. BUTTON_SetSkinClassic(hButton);
      72. BUTTON_SetBkColor(hButton, BUTTON_CI_UNPRESSED, GUI_LIGHTBLUE);
      73. BUTTON_SetBkColor(hButton, BUTTON_CI_PRESSED, GUI_WHITE);
      74. BUTTON_SetTextColor(hButton, BUTTON_CI_PRESSED, GUI_BLUE);
      75. BUTTON_SetTextColor(hButton, BUTTON_CI_UNPRESSED, GUI_BLUE);
      76. while (1) {
      77. GUI_Delay(100);
      78. }
      79. }
      81. /*************************** End of file ****************************/
      Display All

      Best regards,
      Sven
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