LimeReport Forum
General Category | Основное => Discussion | Обсуждение => Topic started by: maurosanjo on December 02, 2016, 06:22:22 PM
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I made a code to study how the callback mechanism works with diferrent band arrangements.
When we have a Data band with a Group Header and with a Group Footer. We put, for instance, 4 fields on data band, that will correspond to columns of each row data. So on LimeReport::CallbackInfo::ColumnCount we set the number of rows = 4.
But if I put text fields in Group Header or Footer using $D{}, the data never gets fetched on getCallbackData.
How can it be done imagining we want different values for each Group Header and Footer fields.
Regards
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Can you send me an example ?
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Hello Arin,
There is a sample page I was testing on version 1.4. Imagine I want to set a differente value for each field on group header and footer bands, not using DB sources, just the signal and slot mechanism you called callback.
The names of the fields in $D are not used in this signal & slot mechanism right? I was testing different patterns.
Regards
[вложение удалено администратором]
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Hi maurosanjo !
The GroupBandHeader and GroupBandFooter bands are designed to create a data grouping
and you must specify a field that will be used for grouping (groupField property of the GroupBandHeader)
when value in that field is changed new group is created.
There is a sample how to use GroupBandHeader and GroupBandFooter. (only for version 1.4 and higher)
If you want simple data header and footer you should use DataHeader and DataFooter bands
[вложение удалено администратором]
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Sorry Arin, on my sample I forgot to put a test group field. That is working correctly.
My question is regarding custom data ON the header and footer that are not coming from DataBase data sources. How do I implement the GetCallBackData slot so I can get a request to set the values of the fields on the group header and footer?
See my sample code below, in my sample I sent you, I have four columns of data and 1 field on group header and 2 on group footer. But this way I only get a call for the 4 data fields and the groupField. I don't know if I could make myself clear, please let me know if you did not understand ;)
void ReportsGenerator::LRGetCallbackData2(LimeReport::CallbackInfo info, QVariant &data) {
switch (info.dataType) {
case LimeReport::CallbackInfo::RowCount:
qDebug() << "P2 RowCount - i" << info.index << " - " << info.columnName << " - r " << this->_currentRow;
data = 4;
break;
case LimeReport::CallbackInfo::ColumnCount:
qDebug() << "P2 ColumnCount - i" << info.index << " - " << info.columnName << " - r " << this->_currentRow;
data = 4;
break;
case LimeReport::CallbackInfo::IsEmpty:
qDebug() << "P2 IsEmpty - r " << this->_currentRow << " - " << info.columnName;
data = true; //!ds->first();
break;
case LimeReport::CallbackInfo::ColumnHeaderData: {
switch(info.index) {
case 0:
data = "Name1";
break;
case 1:
data = "Value1";
break;
case 2:
data = "Name2";
break;
case 3:
data = "Value2";
break;
}
qDebug() << "P2 HeaderData - " << info.index << " - " << data.toString();
break;
}
case LimeReport::CallbackInfo::ColumnData:
qDebug() << "P2 Requested - i - " << info.index << " - " << info.columnName << " - r " << this->_currentRow;
if (info.columnName == "SamplesGroup")
data = "Resultados Gerais";
else {
data = "Data";
}
break;
default: break;
}
}
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I think I understand :)
At first in your code
case LimeReport::CallbackInfo::IsEmpty:
qDebug() << "P2 IsEmpty - r " << this->_currentRow << " - " << info.columnName;
data = true; //!ds->first();
break;
data should be false otherwise callback dataset will be empty
Secondly all fields which you want to use in the report should be described by ColumnHeaderData
void ReportsGenerator::LRGetCallbackData2(LimeReport::CallbackInfo info, QVariant &data) {
switch (info.dataType) {
case LimeReport::CallbackInfo::RowCount:
qDebug() << "P2 RowCount - i" << info.index << " - " << info.columnName << " - r " << this->_currentRow;
data = 4;
break;
case LimeReport::CallbackInfo::ColumnCount:
qDebug() << "P2 ColumnCount - i" << info.index << " - " << info.columnName << " - r " << this->_currentRow;
data = 5;
break;
case LimeReport::CallbackInfo::IsEmpty:
qDebug() << "P2 IsEmpty - r " << this->_currentRow << " - " << info.columnName;
data = false; //!ds->first();
break;
case LimeReport::CallbackInfo::ColumnHeaderData: {
switch(info.index) {
case 0:
data = "Name1";
break;
case 1:
data = "Value1";
break;
case 2:
data = "Name2";
break;
case 3:
data = "Value2";
break;
case 4:
data = "SamplesGroup";
break;
}
qDebug() << "P2 HeaderData - " << info.index << " - " << data.toString();
break;
}
case LimeReport::CallbackInfo::ColumnData:
qDebug() << "P2 Requested - i - " << info.index << " - " << info.columnName << " - r " << this->_currentRow;
if (info.columnName == "SamplesGroup")
data = "Resultados Gerais";
else {
data = "Data";
}
break;
default: break;
}
}
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Thanks, got it :)
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You are welcome