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#include "extlineedit.h"
#include "iconmanager.h"
#include <QStyle>
#include <QAction>
#include <QDebug>
ExtLineEdit::ExtLineEdit(QWidget* parent)
: QLineEdit(parent)
{
init();
}
ExtLineEdit::ExtLineEdit(const QString& text, QWidget *parent)
: QLineEdit(text, parent)
{
init();
}
void ExtLineEdit::init()
{
connect(this, &QLineEdit::textChanged, this, &ExtLineEdit::handleTextChanged);
}
void ExtLineEdit::updateMinSize()
{
setMinimumSize(expandingMinWidth, 0);
}
int ExtLineEdit::getExpandingMaxWidth() const
{
return expandingMaxWidth;
}
void ExtLineEdit::setExpandingMaxWidth(int value)
{
expandingMaxWidth = value;
setMaximumWidth(value);
}
void ExtLineEdit::setClearButtonEnabled(bool enable)
{
QLineEdit::setClearButtonEnabled(enable);
if (enable)
{
// This is a hack to get to know when QLineEdit's clear button is pressed.
// Unfortunately Qt 5.2 API doesn't provide such information,
// but we can find QAction responsible for it by its object name
// and handle its triggered() signal.
// This is not part of an official Qt's API and may be modified in any Qt version.
// Ugly, but works.
static const char* qtClearBtnActionName = "_q_qlineeditclearaction";
QAction *clearAction = findChild<QAction*>(qtClearBtnActionName);
if (!clearAction)
{
qWarning() << "Could not find 'clear action' in QLineEdit, so 'valueErased()' signal won't be emitted from ExtLineEdit.";
return;
}
connect(clearAction, SIGNAL(triggered()), this, SLOT(checkForValueErased()));
connect(this, SIGNAL(textEdited(QString)), this, SLOT(checkForValueErased(QString)));
}
}
void ExtLineEdit::checkForValueErased()
{
nextClearingIsFromButton = true;
}
void ExtLineEdit::checkForValueErased(const QString& text)
{
if (nextClearingIsFromButton && text.isEmpty())
emit valueErased();
nextClearingIsFromButton = false;
}
bool ExtLineEdit::getExpanding() const
{
return expanding;
}
void ExtLineEdit::setExpanding(bool value)
{
expanding = value;
if (!expanding)
setFixedWidth(-1);
else
setFixedWidth(expandingMinWidth);
}
int ExtLineEdit::getExpandingMinWidth() const
{
return expandingMinWidth;
}
void ExtLineEdit::setExpandingMinWidth(int value)
{
expandingMinWidth = value;
updateMinSize();
}
void ExtLineEdit::handleTextChanged()
{
QString txt = text();
if (!expanding)
return;
// Text width
int newWidth = fontMetrics().horizontalAdvance(txt);
// Text margins
QMargins margins = textMargins();
newWidth += margins.left() + margins.right();
// Content margins
QMargins localContentsMargins = contentsMargins();
newWidth += localContentsMargins.left() + localContentsMargins.right();
// Frame
int frameWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
newWidth += frameWidth * 2;
// Extra space
newWidth += expandingExtraSpace;
if (newWidth < expandingMinWidth)
newWidth = expandingMinWidth;
else if (expandingMaxWidth > 0 && newWidth > expandingMaxWidth)
newWidth = expandingMaxWidth;
setFixedWidth(newWidth);
}
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