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#2197 AppFwk : Add supporft for placeholder text (taken from Qt 4.7)

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PlaceholderLineEdit is a temporary class to be removed when Qt is upgraded
This commit is contained in:
Magne Sjaastad 2017-12-11 08:59:02 +01:00
parent 7ddd5ca7d7
commit 3dadef4c76
1 changed files with 83 additions and 6 deletions
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87
Fwk/AppFwk/cafUserInterface/cafPdmUiTreeSelectionEditor.cpp
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@ -46,7 +46,10 @@
#include <QLabel>
#include <QLineEdit>
#include <QMenu>
#include <QPainter>
#include <QPalette>
#include <QSortFilterProxyModel>
#include <QStyleOption>
#include <QTreeView>
#include <algorithm>
@ -120,6 +123,82 @@ protected:
}
};
//--------------------------------------------------------------------------------------------------
/// Ported parts of placeholder text painting from Qt 4.7
/// setPlaceholderText() was introduced in Qt 4.7,
/// and this class is intended to be removed when Qt is upgraded
//--------------------------------------------------------------------------------------------------
class PlaceholderLineEdit : public QLineEdit
{
public:
explicit PlaceholderLineEdit(const QString& placeholderText, QWidget* parent = 0)
: QLineEdit(parent),
m_placeholderText(placeholderText)
{
}
private:
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
virtual void paintEvent(QPaintEvent* paintEvent) override
{
QPainter p(this);
QRect r = rect();
QPalette pal = palette();
QStyleOptionFrameV2 panel;
initStyleOption(&panel);
style()->drawPrimitive(QStyle::PE_PanelLineEdit, &panel, &p, this);
r = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);
int left = 0;
int top = 0;
int right = 0;
int bottom = 0;
getTextMargins(&left, &top, &right, &bottom);
r.setX(r.x() + left);
r.setY(r.y() + top);
r.setRight(r.right() - right);
r.setBottom(r.bottom() - bottom);
p.setClipRect(r);
QFontMetrics fm = fontMetrics();
const int horizontalMargin = 2;
const int vscroll = r.y() + (r.height() - fm.height() + 1) / 2;
QRect lineRect(r.x() + horizontalMargin, vscroll, r.width() - 2*horizontalMargin, fm.height());
int minLB = qMax(0, -fm.minLeftBearing());
int minRB = qMax(0, -fm.minRightBearing());
if (text().isEmpty())
{
if (!hasFocus() && !m_placeholderText.isEmpty())
{
QColor col = pal.text().color();
col.setAlpha(128);
QPen oldpen = p.pen();
p.setPen(col);
lineRect.adjust(minLB, 0, 0, 0);
QString elidedText = fm.elidedText(m_placeholderText, Qt::ElideRight, lineRect.width());
p.drawText(lineRect, Qt::AlignLeft | Qt::TextWordWrap, elidedText);
p.setPen(oldpen);
return;
}
}
return QLineEdit::paintEvent(paintEvent);
}
private:
QString m_placeholderText;
};
namespace caf
{
@ -275,11 +354,9 @@ QWidget* PdmUiTreeSelectionEditor::createEditorWidget(QWidget* parent)
connect(m_toggleAllCheckBox, SIGNAL(clicked(bool)), this, SLOT(slotToggleAll()));
m_textFilterLineEdit = new QLineEdit();
// TODO: This feature was introduced in Qt 4.7
// Consider backporting to 4.6
m_textFilterLineEdit = new PlaceholderLineEdit("Click to add filter");
// TODO: setPlaceholderText() was introduced in Qt 4.7
// Use QLineEdit instead of PlaceholderLineEdit when Qt is upgraded
// m_textFilterLineEdit->setPlaceholderText("Click to add filter");
headerLayout->addWidget(m_textFilterLineEdit);