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Copy pathFilterLineEdit.cpp
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71 lines (62 loc) · 2.78 KB
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#include "FilterLineEdit.h"
#include "Settings.h"
#include <QTimer>
#include <QKeyEvent>
FilterLineEdit::FilterLineEdit(QWidget* parent, QList<FilterLineEdit*>* filters, int columnnum) : QLineEdit(parent), filterList(filters), columnNumber(columnnum)
{
setPlaceholderText(tr("Filter"));
#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
setClearButtonEnabled(true);
#endif
setProperty("column", columnnum); // Store the column number for later use
// Introduce a timer for delaying the signal triggered whenever the user changes the filter value.
// The idea here is that the textChanged() event isn't connected to the update filter slot directly anymore
// but instead there this timer mechanism in between: whenever the user changes the filter the delay timer
// is (re)started. As soon as the user stops typing the timer has a chance to trigger and call the
// delayedSignalTimerTriggered() method which then stops the timer and emits the delayed signal.
delaySignalTimer = new QTimer(this);
delaySignalTimer->setInterval(Settings::getSettingsValue("databrowser", "filter_delay").toInt()); // This is the milliseconds of not-typing we want to wait before triggering
connect(this, SIGNAL(textChanged(QString)), delaySignalTimer, SLOT(start()));
connect(delaySignalTimer, SIGNAL(timeout()), this, SLOT(delayedSignalTimerTriggered()));
// Immediately emit the delayed filter value changed signal if the user presses the enter or the return key or
// the line edit widget loses focus
connect(this, SIGNAL(editingFinished()), this, SLOT(delayedSignalTimerTriggered()));
}
void FilterLineEdit::delayedSignalTimerTriggered()
{
// Stop the timer first to avoid triggering in intervals
delaySignalTimer->stop();
// Emit the delayed signal using the current value
emit delayedTextChanged(text());
}
void FilterLineEdit::keyReleaseEvent(QKeyEvent* event)
{
if(event->key() == Qt::Key_Tab)
{
if(columnNumber < filterList->size() - 1)
{
filterList->at(columnNumber + 1)->setFocus();
event->accept();
}
} else if(event->key() == Qt::Key_Backtab) {
if(columnNumber > 0)
{
filterList->at(columnNumber - 1)->setFocus();
event->accept();
}
}
}
void FilterLineEdit::clear()
{
// When programatically clearing the line edit's value make sure the effects are applied immediately, i.e.
// bypass the delayed signal timer
QLineEdit::clear();
delayedSignalTimerTriggered();
}
void FilterLineEdit::setText(const QString& text)
{
// When programatically setting the line edit's value make sure the effects are applied immediately, i.e.
// bypass the delayed signal timer
QLineEdit::setText(text);
delayedSignalTimerTriggered();
}