QGDropDownBox.cc

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#include "QGDropDownBox.hh"
#include "QGTextEntry.hh"
 
ClassImp(QGDropDownBox)
 
using std::string;
using std::vector;
 
QGDropDownBox::QGDropDownBox(const TGWindow *p) :
TGComboBox(p)
{
    EnableTextInput(kTRUE);
    GetTextEntry()->Connect("ProcessedEvent(Event_t*)", "QGDropDownBox", this,
                            "QGHandleEvent(Event_t*)");
}
 
QGDropDownBox::~QGDropDownBox()
{
}
 
void QGDropDownBox::AddEntryS(const string& entry)
{
    TGComboBox::AddEntry(entry.c_str(), GetNumberOfEntries());
    fEntries.push_back(entry);
}
 
void QGDropDownBox::EnableTabCompletion()
{
    fTextEntry->Connect("TabPressed()", "QGDropDownBox", this, "TabComplete()");
}
 
vector<string> QGDropDownBox::FindMatches(const string& s)
{
        vector<string> matches;
        vector<string>::const_iterator iter;
        for (iter = fEntries.begin(); iter != fEntries.end(); ++iter) {
                if ((*iter).find(s) == 0) matches.push_back(*iter);
        }
        return matches;
}
 
string QGDropDownBox::GetCommonText(const vector<string>& v)
{
        string commonText = v[0];
        string::size_type N =  commonText.size();
        for (unsigned int i = N; i != 0; --i) {
                bool common = true;
                commonText = commonText.substr(0, i);
                vector<string>::const_iterator iter;
                for (iter = v.begin(); iter != v.end(); ++iter) {
                        if (iter->find(commonText) != 0) common = false;
                }
                if (common) break;
        }
        return commonText;
}
 
void QGDropDownBox::HandleReturnPressed()
{
    if (fReturnTarget) {
        fReturnTarget->SetFocus();
    }
}
 
void QGDropDownBox::QGHandleEvent(Event_t *event)
{
    if (event->fType == kFocusOut) {
        GetTextEntry()->Deselect();
    }
}
 
void QGDropDownBox::SetReturnTarget(TGTextEntry *textBox)
{
    if (textBox) {
        fReturnTarget = textBox;
        GetTextEntry()->Disconnect("ReturnPressed()");
        GetTextEntry()->Connect("ReturnPressed()", "QGDropDownBox", this,
                                "HandleReturnPressed()");
    }
    
    if ( QGTextEntry *returnTarget
        = dynamic_cast<QGTextEntry*>(fReturnTarget) ) {
        returnTarget->SetShiftTabTarget( GetTextEntry() );
    }
}
 
void QGDropDownBox::TabComplete()
{
        if (fTextEntry->GetBuffer()->GetTextLength() > 0) {
                string currentText = fTextEntry->GetText();
                
                // Parse for last word
                string separators = " ()*/+-&|=!";
                string::size_type pos = currentText.find_last_of(separators);
                if (pos != string::npos && pos != currentText.size() - 1) {
                        currentText = currentText.substr(pos+1);
                }
                
                vector<string> matches = FindMatches(currentText);
                if (matches.size() > 0) {
                        string commonText = GetCommonText(matches);
                        fTextEntry->AppendText(commonText.substr(currentText.size()).c_str());
                }
        }
}