/****************************************************************************** * * File: Starter.c * * Project : Example A * *****************************************************************************/ #include #include "StarterRsc.h" /*********************************************************************** * * Internal Structures * ***********************************************************************/ typedef struct { UInt8 replaceme; } StarterPreferenceType; typedef struct { UInt8 replaceme; } StarterAppInfoType; typedef StarterAppInfoType* StarterAppInfoPtr; FontID currentFont = stdFont; Char helloStr[] = "Hello World"; /*********************************************************************** * * Global variables * ***********************************************************************/ /*********************************************************************** * * Internal Constants * ***********************************************************************/ #define appFileCreator 'Ex_A' #define appVersionNum 0x01 #define appPrefID 0x00 #define appPrefVersionNum 0x01 // Define the minimum OS version we support (2.0 for now). #define ourMinVersion sysMakeROMVersion(2,0,0,sysROMStageRelease,0) /*********************************************************************** * * Internal Functions * ***********************************************************************/ /*********************************************************************** * * FUNCTION: RomVersionCompatible * * DESCRIPTION: This routine checks that a ROM version is meet your * minimum requirement. * * PARAMETERS: requiredVersion - minimum rom version required * (see sysFtrNumROMVersion in SystemMgr.h * for format) * launchFlags - flags that indicate if the application * UI is initialized. * * RETURNED: error code or zero if rom is compatible * ***********************************************************************/ static Err RomVersionCompatible(UInt32 requiredVersion, UInt16 launchFlags) { UInt32 romVersion; /*------------------------------------------------------------------------ * See if we're on in minimum required version of the ROM or later. *----------------------------------------------------------------------*/ FtrGet(sysFtrCreator, sysFtrNumROMVersion, &romVersion); if (romVersion < requiredVersion) { if ((launchFlags & (sysAppLaunchFlagNewGlobals | sysAppLaunchFlagUIApp)) == (sysAppLaunchFlagNewGlobals | sysAppLaunchFlagUIApp)) { FrmAlert (RomIncompatibleAlert); /*------------------------------------------------------------------------ * Palm OS 1.0 will continuously relaunch this app unless we switch to * another safe one. *----------------------------------------------------------------------*/ if (romVersion < ourMinVersion) { AppLaunchWithCommand(sysFileCDefaultApp, sysAppLaunchCmdNormalLaunch, NULL); } } return sysErrRomIncompatible; } return errNone; } /*********************************************************************** * * FUNCTION: GetObjectPtr * * DESCRIPTION: This routine returns a pointer to an object in the current * form. * * PARAMETERS: formId - id of the form to display * * RETURNED: void * * ***********************************************************************/ static void * GetObjectPtr(UInt16 objectID) { FormPtr frmP; frmP = FrmGetActiveForm(); return(FrmGetObjectPtr(frmP, FrmGetObjectIndex(frmP, objectID))); } /*********************************************************************** * * FUNCTION: PrvSetHelloFont * * DESCRIPTION: Sets the font and centers the field horizontally * * PARAMETERS: * * RETURNED: nothing * ***********************************************************************/ static void PrvCenterTextField(FormPtr frmP, FieldPtr fldP, Boolean draw) { RectangleType r, fr; Int16 stringWidth; /*------------------------------------------------------------------------ * First get the width of the field string in pixels. *----------------------------------------------------------------------*/ FntSetFont(FldGetFont(fldP)); stringWidth = FntCharsWidth(helloStr, StrLen(helloStr)); /*------------------------------------------------------------------------ * Now center the field based on width of string in pixels. *----------------------------------------------------------------------*/ FrmGetFormBounds(frmP, &fr); FrmGetObjectBounds(frmP, FrmGetObjectIndex(frmP, MainHelloField), &r); if (draw) FldEraseField(fldP); r.topLeft.x = (fr.extent.x/2) - (stringWidth/2); FrmSetObjectBounds(frmP, FrmGetObjectIndex(frmP, MainHelloField), &r); if (draw) FldDrawField(fldP); } /*********************************************************************** * * FUNCTION: MainFormInit * * DESCRIPTION: This routine initializes the MainForm form. * * PARAMETERS: frm - pointer to the MainForm form. * * RETURNED: nothing * ***********************************************************************/ static void MainFormInit(FormPtr frmP) { FieldPtr fldP; Char *tmp; currentFont = stdFont; /*------------------------------------------------------------------------ * Initialize the field to "Hello World" and set its font *----------------------------------------------------------------------*/ fldP = (FieldPtr)GetObjectPtr(MainHelloField); if ((tmp = FldGetTextPtr(fldP)) != NULL) MemPtrFree(tmp); tmp = (Char *)MemPtrNew(StrLen(helloStr) + 1); StrCopy(tmp, helloStr); FldSetTextPtr(fldP, tmp); FldSetFont((FieldPtr)GetObjectPtr(MainHelloField), currentFont); PrvCenterTextField(frmP, (FieldPtr)GetObjectPtr(MainHelloField), false);; } /*********************************************************************** * * FUNCTION: MainFormDoCommand * * DESCRIPTION: This routine performs the menu command specified. * * PARAMETERS: command - menu item id * * RETURNED: nothing * ***********************************************************************/ static Boolean MainFormDoCommand(UInt16 command) { Boolean handled = false; UInt16 formID; FormPtr frmP, aboutFrmP; frmP = FrmGetActiveForm(); formID = FrmGetFormId (frmP); switch (command) { case MainOptionsAboutExampleA: MenuEraseStatus(0); aboutFrmP = FrmInitForm (AboutForm); FrmDoDialog (aboutFrmP); // Display the About Box. FrmDeleteForm (aboutFrmP); handled = true; break; case MainOptionsFont : currentFont = FontSelect(currentFont); FldSetFont((FieldPtr)GetObjectPtr(MainHelloField), currentFont); PrvCenterTextField(frmP, (FieldPtr)GetObjectPtr(MainHelloField), true); handled = true; break; } return(handled); } /*********************************************************************** * * FUNCTION: MainFormHandleEvent * * DESCRIPTION: This routine is the event handler for the * "MainForm" of this application. * * PARAMETERS: eventP - a pointer to an EventType structure * * RETURNED: true if the event has handle and should not be passed * to a higher level handler. * * REVISION HISTORY: * * ***********************************************************************/ static Boolean MainFormHandleEvent(EventPtr eventP) { Boolean handled = false; FormPtr frmP; switch (eventP->eType) { case menuEvent: return MainFormDoCommand(eventP->data.menu.itemID); case frmOpenEvent: frmP = FrmGetActiveForm(); MainFormInit(frmP); FrmDrawForm (frmP); handled = true; break; default: break; } return(handled); } /*********************************************************************** * * FUNCTION: AppHandleEvent * * DESCRIPTION: This routine loads form resources and set the event * handler for the form loaded. * * PARAMETERS: event - a pointer to an EventType structure * * RETURNED: true if the event has handle and should not be passed * to a higher level handler. * * REVISION HISTORY: * * ***********************************************************************/ static Boolean AppHandleEvent(EventPtr eventP) { UInt16 formId; FormPtr frmP; if (eventP->eType == frmLoadEvent) { /*------------------------------------------------------------------------ * Load the form resource. *----------------------------------------------------------------------*/ formId = eventP->data.frmLoad.formID; frmP = FrmInitForm(formId); FrmSetActiveForm(frmP); /*------------------------------------------------------------------------ * Set the event handler for the form. The handler of the currently * active form is called by FrmHandleEvent each time is receives an event. *----------------------------------------------------------------------*/ switch (formId) { case MainForm: FrmSetEventHandler(frmP, MainFormHandleEvent); break; default: ErrFatalDisplay("Invalid Form Load Event"); break; } return(true); } return(false); } /*********************************************************************** * * FUNCTION: AppEventLoop * * DESCRIPTION: This routine is the event loop for the application. * * PARAMETERS: nothing * * RETURNED: nothing * * REVISION HISTORY: * * ***********************************************************************/ static void AppEventLoop(void) { UInt16 error; EventType event; do { EvtGetEvent(&event, evtWaitForever); if (! SysHandleEvent(&event)) if (! MenuHandleEvent(0, &event, &error)) if (! AppHandleEvent(&event)) FrmDispatchEvent(&event); } while (event.eType != appStopEvent); } /*********************************************************************** * * FUNCTION: AppStart * * DESCRIPTION: Get the current application's preferences. * * PARAMETERS: nothing * * RETURNED: Err value 0 if nothing went wrong * ***********************************************************************/ static Err AppStart(void) { StarterPreferenceType prefs; UInt16 prefsSize; /*------------------------------------------------------------------------ * Read the saved preferences / saved-state information. *----------------------------------------------------------------------*/ prefsSize = sizeof(StarterPreferenceType); if (PrefGetAppPreferences(appFileCreator, appPrefID, &prefs, &prefsSize, true) != noPreferenceFound) { } return(errNone); } /*********************************************************************** * * FUNCTION: AppStop * * DESCRIPTION: Save the current state of the application. * * PARAMETERS: nothing * * RETURNED: nothing * ***********************************************************************/ static void AppStop(void) { StarterPreferenceType prefs; /*------------------------------------------------------------------------ * Write the saved preferences / saved-state information. This data * will be backed up during a HotSync. *----------------------------------------------------------------------*/ PrefSetAppPreferences (appFileCreator, appPrefID, appPrefVersionNum, &prefs, sizeof (prefs), true); /*------------------------------------------------------------------------ * Close all the open forms. *----------------------------------------------------------------------*/ FrmCloseAllForms (); } /*********************************************************************** * * FUNCTION: StarterPalmMain * * DESCRIPTION: This is the main entry point for the application. * * PARAMETERS: cmd - word value specifying the launch code. * cmdPB - pointer to a structure that is associated with the launch code. * launchFlags - word value providing extra information about the launch. * * RETURNED: Result of launch * * REVISION HISTORY: * * ***********************************************************************/ static UInt32 StarterPalmMain(UInt16 cmd, MemPtr cmdPBP, UInt16 launchFlags) { Err error; if ((error = RomVersionCompatible (ourMinVersion, launchFlags)) != 0) return (error); switch (cmd) { case sysAppLaunchCmdNormalLaunch: if ((error = AppStart()) != errNone) return(error); FrmGotoForm(MainForm); AppEventLoop(); AppStop(); break; default: break; } return(errNone); } /*********************************************************************** * * FUNCTION: PilotMain * * DESCRIPTION: This is the main entry point for the application. * * PARAMETERS: cmd - word value specifying the launch code. * cmdPB - pointer to a structure that is associated with the launch code. * launchFlags - word value providing extra information about the launch. * RETURNED: Result of launch * * REVISION HISTORY: * * ***********************************************************************/ UInt32 PilotMain( UInt16 cmd, MemPtr cmdPBP, UInt16 launchFlags) { return StarterPalmMain(cmd, cmdPBP, launchFlags); }