/****************************************************************************** * * File: Starter.c * * Project: Example C * *****************************************************************************/ #include #include "StarterRsc.h" /*********************************************************************** * * Entry Points * ***********************************************************************/ /*********************************************************************** * * Internal Structures * ***********************************************************************/ typedef struct { UInt8 replaceme; } StarterPreferenceType; typedef struct { UInt8 replaceme; } StarterAppInfoType; typedef StarterAppInfoType* StarterAppInfoPtr; FontID currentFont = stdFont; /*********************************************************************** * * Global variables * ***********************************************************************/ /*********************************************************************** * * Internal Constants * ***********************************************************************/ #define appFileCreator 'Ex_5' #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 * * REVISION HISTORY: * * ***********************************************************************/ 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 * * * REVISION HISTORY: * * ***********************************************************************/ static void * GetObjectPtr(UInt16 objectID) { FormPtr frmP; frmP = FrmGetActiveForm(); return(FrmGetObjectPtr(frmP, FrmGetObjectIndex(frmP, objectID))); } /*********************************************************************** * * FUNCTION: DrawHelloWorld * * DESCRIPTION: This routine prints "Hello World" to the center of the * window. * * PARAMETERS: formId - id of the form to display * * RETURNED: void * * * REVISION HISTORY: * * ***********************************************************************/ static void DrawHelloWorld(void) { MemHandle resH; BitmapPtr resP; char *str = "Hello World"; FontID savedFont; Coord x, y, winWidth, winHeight; resH = DmGetResource(bitmapRsc, GlobeBitmap); ErrFatalDisplayIf(!resH, "Missing bitmap"); resP = MemHandleLock(resH); WinGetWindowExtent(&winWidth, &winHeight); savedFont = FntSetFont(currentFont); /*------------------------------------------------------------------------ * Draw the globe graphic *----------------------------------------------------------------------*/ x = (winWidth/2) - (resP->width/2); y = (winHeight/2) - (resP->height/2); WinDrawBitmap(resP, x, y); /*------------------------------------------------------------------------ * Draw String below the globe *----------------------------------------------------------------------*/ x = (winWidth/2) - (FntCharsWidth(str, StrLen(str))/2); y = y + resP->height + FntCharHeight() + 10; WinDrawChars(str, StrLen(str), x, y); FntSetFont(savedFont); MemPtrUnlock(resP); DmReleaseResource(resH); } /*********************************************************************** * * FUNCTION: EraseHelloWorld * * DESCRIPTION: This routine erases "Hello World" from the window. * * PARAMETERS: formId - id of the form to display * * RETURNED: void * * * REVISION HISTORY: * * ***********************************************************************/ static void EraseHelloWorld(void) { MemHandle resH; BitmapPtr resP; char *str = "Hello World"; FontID savedFont; Coord x, y, winWidth, winHeight; resH = DmGetResource(bitmapRsc, GlobeBitmap); ErrFatalDisplayIf(!resH, "Missing bitmap"); resP = MemHandleLock(resH); WinGetWindowExtent(&winWidth, &winHeight); savedFont = FntSetFont(currentFont); x = (winWidth/2) - (FntCharsWidth(str, StrLen(str))/2); y = (winHeight/2) - (resP->height/2); y = y + resP->height + FntCharHeight() + 10; WinEraseChars(str, StrLen(str), x, y); FntSetFont(savedFont); MemPtrUnlock(resP); DmReleaseResource(resH); } /*********************************************************************** * * FUNCTION: MainFormInit * * DESCRIPTION: This routine initializes the MainForm form. * * PARAMETERS: frm - pointer to the MainForm form. * * RETURNED: nothing * * REVISION HISTORY: * * ***********************************************************************/ static void MainFormInit(FormPtr /*frmP*/) { DrawHelloWorld(); } /*********************************************************************** * * FUNCTION: MainFormDoCommand * * DESCRIPTION: This routine performs the menu command specified. * * PARAMETERS: command - menu item id * * RETURNED: nothing * * REVISION HISTORY: * * ***********************************************************************/ static Boolean MainFormDoCommand(UInt16 command) { Boolean handled = false; UInt16 formID; FormPtr frmP; FontID newFont; switch (command) { case MainOptionsAboutExampleC: MenuEraseStatus(0); // Clear the menu status from the display. frmP = FrmInitForm (AboutForm); FrmDoDialog (frmP); // Display the About Box. FrmDeleteForm (frmP); handled = true; break; case MainOptionsFont : formID = (FrmGetFormId (FrmGetActiveForm ())); newFont = FontSelect(currentFont); EraseHelloWorld(); currentFont = newFont; FrmUpdateForm (formID, frmRedrawUpdateCode); 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; case frmUpdateEvent : DrawHelloWorld(); 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 * * REVISION HISTORY: * * ***********************************************************************/ 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 * * REVISION HISTORY: * * ***********************************************************************/ 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: error = AppStart(); if (error) 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); }