= Updating Legacy Apps to New Look =

Consider if the app to be changed only has minor changes from one of the standard apps. In this case it may be easier to use the code from the new style standard app and merge the changes into it. 

Otherwise, follow the below steps.

1. If it has not been done yet create 825gen2 build configurations for the project: Debug-ARM825, Release-ARM825, (See [wiki:UpdatingLegacyApps Updating Legacy Apps]) and Debug-ARM825-SIM (See  [wiki:Simulating825gen2 Simulating 825gen2 Apps]).

2. Copy the files apphelpers.cpp, apphelpers.h, and appinfo.h from one of the new standard projects such as ID storage into the project to update. Changes to these files might be needed. For example, if different fonts or font sizes are desired these are specified in apphelpers.cpp.

3. Copy code for main screen below from a standard app such as ID storage. It is likely changes will need to be made to this code to suit the particular application.

{{{
#if ARM64

#define NUM_WT_INDEXES	3 // Gross, tare, net
#define WT_INDEX_GROSS 	0
#define WT_INDEX_TARE  	1
#define WT_INDEX_NET	2

CFormRect rectWtLbl[NUM_WT_INDEXES]; // Location for gross, tare, net labels
CFormRect rectWt[NUM_WT_INDEXES];
CFormRect rectWtUnits[NUM_WT_INDEXES];
CFormRect rectWtStatus;
CFormRect rectCapacity[2]; // If OIML needs two lines
CFormRect rectErrorMsg;
CFormRect rectLargeMsg; // Size of all weight rects, used for "WEIGHT ERROR", or "OVER CAPACITY"
CFormRect rectManTare;
CFormRect rectBelowButtons;
CFormRect rectWeightBackground;

void SetupDisplayLocations(void)
{
	int n;

	CFormRect rect;
	CFormAdvanceY advanceY;

	// Weight status below capacity with is fontIndexSmallPrompt,multiplier 1.0 plus fixed DrawBorder  height FONT_HEIGHT + 16
	rect.SetTopBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), 1.0, BORDER_BOX_HEIGHT);
	rect.SetHeightBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), 1.0);
	rect.SetLeftAndWidthBasedOnDspArea(&dspMain, 0.26, 0.25); // Show above of gross weight value

	rectWtStatus = rect;
	rectWtStatus.SetLeftAndWidthBasedOnDspArea(&dspMain, 0.0, 0.30);
	rectWtStatus.SetTopBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), 1.7, BORDER_BOX_HEIGHT);

	for(n = 0; n < 2; n++)
	{
		if(n == 0)
		{
			rectCapacity[n].SetY(BORDER_BOX_HEIGHT);
		}
		else
		{
			rectCapacity[n].SetTopBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), BORDER_BOX_HEIGHT);
		}
		rectCapacity[n].SetX(0);
		rectCapacity[n].SetLeftAndWidthBasedOnDspArea(&dspMain, 0.01, 0.41);
		rectCapacity[n].SetHeightBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), 1.0);
	}

	advanceY.SetBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), 1.0, 0);

	rect += advanceY;

	rectManTare = rect;
	rectManTare.SetLeftAndWidthBasedOnDspArea(&dspMain, 0.31, 0.20);
	rectManTare.SetTopBasedOnFont(formFontSet.GetFont(fontIndexSmallPrompt), 1.7, BORDER_BOX_HEIGHT);

	// Setup weight label, value, and units locations
	// horizontal coordinates based on display area width
	// vertical coordinates based on font heights
	//
	//  Header
	// Capacity 1
	// Capacity 2
	//
	//   |- 0% 25% -|- 26% - 51%  -|- 55% 70% -|
	//
	//                wt status
	//    Gross          120000       lb
	//
	//    Tare            40000       lb
	//
	//    Net             80000       lb
	//
	//   Error message
	//   ----- Buttons -------

	rect.SetHeightBasedOnFont(fontBigLabel, 1.0);
	// move Y position down to 1/4 of font height.
	int heightNZ = fontBigLabel.GetFont(0).GetHeight();
	heightNZ = heightNZ / 2;
	int heightZ = fontBigLabel.GetFont(1).GetHeight();
	heightZ = heightZ / 2;
	advanceY.SetBasedOnFont(fontBigLabel, 1.0);
	rect.GetRect(0).SetY(rect.GetRect(0).GetY() + heightNZ);
	rect.GetRect(1).SetY(rect.GetRect(1).GetY() + heightZ);

	for(n = 0; n < NUM_WT_INDEXES; n++)
	{
		rect.SetLeftAndWidthBasedOnDspArea(&dspMain, 0.01, 0.24);
		rectWtLbl[n] = rect;

		rect.SetLeftAndWidthBasedOnDspArea(&dspMain, 0.26, 0.25);
		rectWt[n] = rect;

		rect.SetLeftAndWidthBasedOnDspArea(&dspMain, 0.55, 0.15);
		rectWtUnits[n] = rect;

		rect += advanceY;
	}

	// Large message such as "WEIGHT ERROR" upper left is set same as weight label "Gross", lower right is same as net weight units label.
	rectLargeMsg.SetLocationAndSizeFrom(rectWtLbl[WT_INDEX_GROSS], rectWtUnits[WT_INDEX_NET]);

	rectWeightBackground.SetLocationAndSizeFrom(rectWtLbl[WT_INDEX_GROSS], rectWtLbl[WT_INDEX_GROSS]);
	rectWeightBackground.SetX(0);
	rectWeightBackground.SetWidth(dspMain.GetWidth() - 1);

	rect.SetTopBasedOnFont(formFontSetSmall.GetFont(fontIndexPrompt), 12.0);
	rect.SetHeightBasedOnFont(formFontSetSmall.GetFont(fontIndexPrompt), 1.0);
	rect.SetX(0);
	rect.SetWidth((dspMain.GetWidth() / 2) - 1);
	rectErrorMsg = rect;
}

#endif

}}}

4. Find the InitLCD function call and change as follows:

{{{
void IndStartup(void)
{
#if ARM64
	InitLCD(DSP_INIT_NEW_STYLE_APP);

	dspMain.SetZoomWidth(0, dspMain.GetZoomWidth(1));
	if(dsp_height > 800) {
		dspMain.SetZoomHeight(0, (int)(dspMain.GetZoomHeight(1) * 0.84));
	}

	InitFonts();

	SetupDisplayLocations();

#else
	InitLCD();
#endif
// ... Additional code
}
}}}

5. Modify functions that do display operations such as shown:

{{{
void ShowGTN(void)
{
#if ARM64
	SetCurColor(COLOR_INFO);
	SetBkColor(nColorWhite);
	fontBigLabel.DisplayText(rectWtLbl[WT_INDEX_GROSS], LANG(STR_GROSS_LABEL));

	if (curScale >= 0 && GetWtMode(curScale) == wtmode_net) {
		fontBigLabel.DisplayText(rectWtLbl[WT_INDEX_TARE], LANG(STR_TARE_LABEL));
		fontBigLabel.DisplayText(rectWtLbl[WT_INDEX_NET], LANG(STR_NET_LABEL));
	}
#else
	SetCurColor(nColorGreen);
	SetBkColor(nColorBlack);
	DisplayText(GROSS_LBL_X, GROSS_WT_Y, LANG(STR_GROSS_LABEL), 0, BIG_FONT);

	if (curScale >= 0 && GetWtMode(curScale) == wtmode_net) {
		DisplayText(TARE_LBL_X, TARE_WT_Y, LANG(STR_TARE_LABEL), 0, BIG_FONT);
		DisplayText(NET_LBL_X, NET_WT_Y, LANG(STR_NET_LABEL), 0, BIG_FONT);
	}
	SetBkColor(nColorBlack);
#endif
}
}}}

6. Search for all menu and inputs forms such as search for "FORM_INIT" make appropriate changes to use new style FORM_ADD_INPUT2 instead of FORM_ADD_INPUT and FORM_ADD_BUTTON2 instead of FORM_ADD_BUTTON such as:

{{{
void PresetScreen(void)
{
#if ARM64
	CFormRect rect, rectInp;

	FORM_INIT(Setup, EventPresetScreenShow, NULL, NULL, NULL, nFormFlgShowHelp);

	SetupInputFormToUseFontSet(formSetup, rect, rectInp, "Total Violation: ");

	FORM_ADD_INPUT2(Setup, Thresh,  rect, rectInp, "On Threshold: ", 6, 0, 999999, NULL, &g_setup.onThresh, FORM_FLOAT, NULL, "Enter the on threshold");
	AdvanceInputRects(rect, rectInp);
	FORM_ADD_INPUT2(Setup, ViolTot, rect, rectInp, "Total Violation: ", 6, 0, 999999, NULL, &g_setup.violWt[0], FORM_FLOAT, NULL, "Enter violation weight for total");
	AdvanceInputRects(rect, rectInp);
	FORM_ADD_INPUT2(Setup, Viol1,   rect, rectInp, "P1 Violation: ", 6, 0, 999999, NULL, &g_setup.violWt[1], FORM_FLOAT, NULL, "Violation weight for P1");
#else
	FORM_INIT(Setup, EventPresetScreenShow, NULL, NULL, NULL, nFormFlgShowHelp);
	FORM_ADD_INPUT(Setup, Thresh, 0, FONT_HEIGHT * 2, "On Threshold: ", 6, 0, 999999, NULL, &g_setup.onThresh, FORM_FLOAT, NULL, "Enter the on threshold");
	FORM_ADD_INPUT(Setup, ViolTot, 0, FONT_HEIGHT * 4, "Total violation: ", 6, 0, 999999, NULL, &g_setup.violWt[0], FORM_FLOAT, NULL, "Enter violation weight for total");
	FORM_ADD_INPUT(Setup, Viol1, 0, FONT_HEIGHT * 6, "P1 Violation: ", 6, 0, 999999, NULL, &g_setup.violWt[1], FORM_FLOAT, NULL, "Violation weight for P1");
#endif
	FORM_SHOW(Setup);
	int n = FORM_RUN(Setup);
	if (n != FORM_RESULT_ESC) {
		SaveSetup();
	}
	FORM_HIDE(Setup);
}
}}}

In the above example notice after FORM_INIT the function !SetupInputFormToUseFontSet is called. This gives the form a pointer to the fonts that were initialized previously. The function also sets the starting positions of the rect, and rectInp rectangles that are used to define where to show the prompts and input fields. The final parameter is a string that to used to determine the width of the prompts. This should be the longest prompt text in the form. The !AdvanceInputRects function call is used between FORM_ADD_INPUT2 calls to move the rect and rectInp down an appropriate amount for the next input.

{{{
void FileOperation(void)
{
#if ARM64
	CFormRect rect;

	FORM_INIT(Update, EventDownloadedFileShow, NULL, NULL, NULL, 0);

	SetupMenuFormToUseFontSet(formUpdate, rect, 0.8 );

	FORM_ADD_BUTTON2(Update, Export, rect, "Export",	'X',  EventExport,	FORM_BUTTON_SHADOW);
	rect += btnAdvanceY;
	FORM_ADD_BUTTON2(Update, Import, rect, "Import",	'I',  EventImport,	FORM_BUTTON_SHADOW);
#else
	FORM_INIT(Update, EventDownloadedFileShow, NULL, NULL, NULL, 0);

	FORM_ADD_BUTTON(Update, Export, MENU_COL1_X, 	MENU_ROW1_Y, 	" Export ", 'X', EventExport, FORM_BUTTON_INVERT);
	FORM_ADD_BUTTON(Update, Import, MENU_COL1_X, 	MENU_ROW2_Y, 	" Import ", 'I', EventImport, FORM_BUTTON_INVERT);
#endif

	FORM_SHOW(Update);
        FORM_RUN(Update);
	FORM_HIDE(Update);
}
}}}