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fix: keep placeholder within text margins (DLineEditEx) #76

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fix: keep placeholder within text margins (DLineEditEx) #76

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12 changes: 10 additions & 2 deletions src/widgets/dlineeditex.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -160,8 +160,16 @@ void DLineEditEx::paintEvent(QPaintEvent *event)
// 使用 elidedText 确保文本过长时在右侧显示省略号，而不是换行
QFontMetrics fm(pa.font());
const QString &placeholderText = lineEdit()->placeholderText();
QString elidedText = fm.elidedText(placeholderText, Qt::ElideRight, rect().width());
pa.drawText(rect(), Qt::AlignCenter | Qt::TextSingleLine, elidedText);
// 将 placeholder 的省略与绘制约束到扣除内嵌 QLineEdit 的 textMargins()
// 后的文本可用矩形内，避免长 placeholder 与左右功能图标重叠。
// DLineEditEx(QFrame) 与内嵌 QLineEdit 存在父子控件偏移，需用 mapTo
// 将 QLineEdit 坐标系映射到 DLineEditEx 绘制坐标系。
QLineEdit *le = lineEdit();
const QMargins tm = le->textMargins();
const QRect lineEditRect(le->mapTo(this, QPoint(0, 0)), le->size());
const QRect textRect = lineEditRect.adjusted(tm.left(), tm.top(), -tm.right(), -tm.bottom());
QString elidedText = fm.elidedText(placeholderText, Qt::ElideRight, textRect.width());
pa.drawText(textRect, Qt::AlignCenter | Qt::TextSingleLine, elidedText);

// 当文本被省略时，设置 tooltip 显示完整文本
if (elidedText != placeholderText) {
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