Common Question 12

I want the user to be able to click a hot-spot. How do I do this?

ProEssentials has many hot-spots which the user can click or double-click.

Hot-Spot Type	What the end-user clicks
Data Points	Bars, symbols, and line/area junctures.
Subset Labels	Subset label text in graph and table legend areas.
Point Labels	PointLabels which are placed below x axis on Graph objects.
Graph Coordinates	Any location inside graph's grid.
Table Coordinates	Any location inside Graph object's table.
Graph Annotations	Text, symbols, line junctures, rect corners.
Line Annotations	Anywhere on a horizontal or vertical line.
Axis Annotations	Annotation text.
Main Title	Main Title text.
Sub Title	Sub Title text.
Main Title	Main Title text.
MultiSubTitle	Multi Sub Title text.
MultiBottomTitle	Multi Bottom Title text.
Y and X Axis Labels	Axis Label text.
Y and X Axis	Any location along entire axis.
Y and X Axis Grid Numbers	Text showing value of grid lines.
Table Annotation	Any item within a table annotation.

Hot-Spot Type	Property used to enable Hot-Spot
Data Points	AllowDataHotSpots
Subset Labels	AllowSubsetHotSpots
Point Labels	AllowPointHotSpots
Graph Coordinates	AllowGraphHotSpots
Table Coordinates	AllowTableHotSpots
Graph Annotations	AllowGraphAnnotHotSpots
Line Annotations	AllowHorzLineAnnotHotSpots
Graph Annotations	AllowGraphAnnotHotSpots AllowVertLineAnnotHotSpots
Axis Annotations	AllowXAxisAnnotHotSpots AllowYAxisAnnotHotSpots
Main Title	AllowTitleHotSpots
Sub Title	AllowTitleHotSpots
MultiSubTitle	AllowSubTitleHotSpots
MultiBottomTitle	AllowBottomTitleHotSpots
Y Axis Label	AllowAxisLabelHotSpots
X Axis Label	AllowAxisHotSpots
Y Axis	AllowAxisHotSpots
X Axis	AllowAxisHotSpots
Y Axis Grid Numbers	AllowGridNumberHotSpotY
X Axis Grid Numbers	AllowGridNumberHotSpotX
Table Annotation	TAHotSpot

.NET Hot-Spot Handling

For .NET developers, event listings can also be found via the .NET Reference

.NET, OCX, and VCL Hot-Spot Handling

.NET, OCX, and VCL developers respond to hot-spots via events built into the visual interface. Utilizing these events is as easy as setting the above properties to TRUE and placing your code inside the event names as follows.

Note that all hot spots provide the DblClk argument to signify whether the user clicked or double-clicked the hot spot. Also note that you can not respond to both the click and double-click events because the double-click event also initially triggers a click event.

Hot-Spot Type	.NET Event Name	OCX, VCL Event Name	Event Arguments
Data Points	PeDataHotSpot	DataHotSpot	Subset and Point indices
Subset Labels	PeSubsetHotSpot	SubsetHotSpot	Subset index
Point Labels	PePointHotSpot	PointHotSpot	Point index
Graph Coordinates	PeGraphHotSpot	GraphHotSpot	X, Y coords and Axis index
Table Coordinates	PeTableHotSpot	TableHotSpot	Subset and Point indices
Graph Annotations	PeGraphAnnotHotSpot	GraphAnnotHotSpot	Annotation Index
Line Annotations	PeHorzLineAnnotHotSpot PeVertLineAnnotHotSpot	HorzLineAnnotHotSpot VertLineAnnotHotSpot	Annotation Index
Axis Annotations	PeXAxisAnnotHotSpot PeYAxisAnnotHotSpot	XAxisAnnotHotSpot YAxisAnnotHotSpot	Annotation Index
Main Title	PeMainTitle	MainTitle	na
Sub Title	PeSubTitle	SubTitle	na
MultiSubTitle	PeMultiSubTitle	MultiSubTitle	Title index and Justification
MultiBottomTitle	PeMultiBottomTitle	MultiBottomTitle	Title index and Justification
Y Axis Label	PeYAxisLabel	YAxisLabel	Axis index and nRight*
X Axis Label	PeXAxisLabel	XAxisLabel	nTop*
Y Axis	PeYAxis	YAxis	Axis index, nRight, and Yval
X Axis	PeXAxis	XAxis	nTop, and Xval
Y or X Axis Grid Number	PeGridNumber	YAxis	Axis index, nRight, and Yval
Table Annotation	PeTableAnnotation	TableAnnotation	nIndex, nRow and nColumn indices

*nRight is 0 for left y axis and 1 for right y axis.

*nTop is 0 for bottom x axis and 1 for top x axis.

*Yval and *Xval are the graph axis location in data units.

C/C++ Hot-Spot Handling

C/C++ SDK developers respond to hot-spots via the Windows notification message mechanism. This mechanism uses the WM_COMMAND message to pass notification codes in HIWORD(wParam) for 32 bit targets. You will respond to either the PEWN_CLICKED or PEWN_DBLCLICKED notification codes and then use PEvget to retrieve the PEP_structHOTSPOTDATA property. This property will inform you of the type of Hot-Spot selected (if any) and also provides information with respect to that selection. In the case of a Graph Hot-Spot (PEHS_GRAPH), you will need to retrieve the PEP_structGRAPHLOC property to determine the graph coordinates where the user clicked.

The following is a C/C++ example of responding to a Subset Hot-Spot. For those of you not familiar with the Microsoft Foundation Classes, OnCommand is a function that processes the WM_COMMAND message.

BOOL CDemo2View::OnCommand(WPARAM wp, LPARAM lp)

{

HOTSPOTDATA HSData;

#ifdef _WIN32

switch (HIWORD(wp))

#else // 16 bit

switch (HIWORD(lp))

#endif

{

case PEWN_CLICKED:

PEvget(m_hPE, PEP_structHOTSPOTDATA, &HSData);

if (HSData.nHotSpotType == PEHS_SUBSET)

{

char szTmp[128];

char szSubset[48];

strcpy(szTmp, "You clicked subset ");

sprintf(szSubset, "%i", HSData.w1);

strcat(szTmp, szSubset);

strcat(szTmp, ". Subset label is ");

PEvgetcell(m_hPE, PEP_szaSUBSETLABELS, HSData.w1, szSubset);

strcat(szTmp, szSubset);

strcat(szTmp, ".");

MessageBox(szTmp,"Subset Hot-Spot",MB_OK|MB_ICONINFORMATION);

}

return TRUE;

}

return CView::OnCommand(wp, lp);

}


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